CN109277885A

CN109277885A - A kind of grinding method of tungsten carbide coating thin-walled guide cylinder

Info

Publication number: CN109277885A
Application number: CN201811195808.4A
Authority: CN
Inventors: 刘献礼; 崔玉龙; 周亚栋; 李景帅
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2018-10-15
Filing date: 2018-10-15
Publication date: 2019-01-29

Abstract

The invention discloses a kind of method for grinding of tungsten carbide coating thin-walled guide tube, it is specifically related to the method for grinding of a kind of tungsten carbide coating thin-walled guide tube and fixture；A kind of method for grinding of fixture is ground fixture by operating grinding machine, improves the positioning accuracy of workpiece；A kind of method for grinding of tungsten carbide coating thin-walled guide tube, it requires to determine grinding technique parameter based on the grinding technique to the tungsten carbide coating thin-walled guide tube outer profile (outer circle, knuckle, end face, end chamfer), and grinding process control is carried out to tungsten carbide coating thin-walled guide tube outer profile；When realizing grinding, grinding machine, fixture, grinding wheel and workpiece constitute a complete process system, have prevented the generation of certain model aluminum alloy sleeve class thin-walled parts coating grinding quality problem in this way, and have passed through long-term practice test, the qualification rate for improving part has reference to Instructing manufacture.

Description

A kind of method for grinding of tungsten carbide coating thin-walled guide tube

Technical field

It is special the present invention relates to the grinding of tungsten carbide coating thin-wall workpiece and other coating Grinding Technology with high hardness fields A kind of novel method for grinding is not provided, belongs to difficult-to-machine material efficient precise grinding technical field.

Background technique

Tungsten carbide (Tungsten Carbide), is a kind of compound being made of tungsten and carbon, and grey has metallic luster Powder, the chemical property of tungsten carbide is stable, very hard, spring rate is also big.Tungsten carbide is largely used as high-speed cutting lathe tool, kiln knot Structure material, jet engine parts, resistance heating element etc. are made, for manufacturing cutting element, wear parts, hard alloy Requirement of the specifically used demand difference to tungsten carbide size is also different.Before, I has proposed to State Patent Office entitled The utility model application of " a kind of tungsten carbide coating thin-walled guide tube clamp ", application No. is " 2018216363530 ", sequence of sending the documents Number for " 2018101000804150 " clamp it is fixed primarily directed to a kind of grinding and clamping of tungsten carbide coating thin-walled guide tube Position, fixture include that jig main body and end cap are connected in corase grinding using jig main body installation positioning by bolt and fastening nut It is fixed, fixation is connected through a screw thread using end cap clamping together with jig main body in fine grinding, fixture by centre bore with it is top It is connected and realizes the grinding of workpiece, is improved by splitting fixture so that workpiece has different locating effects in corase grinding and fine grinding The machining accuracy of workpiece.In the present invention, tungsten carbide coating thin-walled guide tube belongs to cover parts, and being processed matrix is outside aluminium alloy The workpiece of portion's sprayed wc material, basis material are 7075-TT3, and surface spraying YGH40 tungsten carbide belongs to hard alloy It is unmanageable superhard material, hardness number HVB80, thermal coefficient is low.Its sprayed wc coating has low porosity, Gao Jie It closes intensity and the features such as excellent wear-resisting property, has the wear-resisting ruler for requiring axis class, cover parts (such as: guide tube) in Aeronautics and Astronautics It has been widely used in very little and precision reparation；But it is restricted by technique and coating performance, original Coating Surface Roughness and shape are public The poor requirement for not being able to satisfy design generally, it is necessary to be guaranteed by being ground.In actual production, because misoperation or parameter are selected It is bad to select unreasonable equal Absent measures, frequently results in part thermal stress deformation, disbonding, cracking or micro-crack etc. occurs and lack It falls into, seriously affects coating quality, constrain the normal delivery of product.

Grinding is to be ground by operating grinding machine to fixture using high-speed rotating grinding wheel, improve the positioning of workpiece Precision makes workpiece to be machined reach technique requirement by using corase grinding, half fine grinding, fine grinding and super grinding；Corase grinding selects white fused alumina Skive is selected in grinding wheel, half fine grinding, fine grinding, super grinding；In actual production, the locating effect of reasonable selection fixture, The service performance that rationally utilize grinding wheel, selects reasonable machined parameters, controls part thermal stress deformation, guarantees that coating is ground matter Amount；When realizing grinding, grinding machine, fixture, grinding wheel and workpiece constitute a complete process system, have prevented the conjunction of certain model aluminium in this way The generation of gold set class thin-walled parts coating grinding quality problem, and have passed through long-term practice test, improve the qualification of part Rate has reference to Instructing manufacture.

Summary of the invention

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a kind of tungsten carbide coating thin-walled guide tube and folder The method for grinding of tool, used technical solution is: a kind of method for grinding of tungsten carbide coating thin-walled guide tube fixture, based on logical It crosses step as described below to be ground fixture, grinding movement and crushing movement be controlled, by operating grinding machine Fixture is ground, the positioning accuracy of workpiece is improved；

It is described that specific step is as follows:

1) fine-grinding fixture main body (1) the two sides centre bore conical surface (2)；

2) with centre bore (3) positioning fine-grinding fixture body outer diameter (4) and shoulder end face (5)；

3) with two planes of surface grinding machine fine grinding end cap (33)；

The specific implementation of the step 1) is to fill two centre bores (3) of jig main body with top (6) and centre frame (7) Folder, tells fixed device by pull rod (8), driver plate (9), fastening screw (10), spring (11), washer (12) and nut (13) group At；

Its clamping method is as follows: using the centre bore (3) of jig main body one end as positioning datum, jig main body (1) being used bullet Spring force is supported on top (6) and is tightened with washer (12) fixture nut (13), pull rod (8) pass through driver plate (9) location hole by its It is fixed on grinding machine head stock frame (14), realizes driver plate (9) axial restraint, tighten the circumferential direction that fastening screw (10) realize driver plate (9) It is fixed；And its right end is supported with centre frame (7), since centre bore and jig main body outer circle have very high position precision, and it is top The shadow that the radial circular run-out error that will not turn in jig main body one end, therefore can eliminate grinding machine head stock frame spindle end processes jig main body It rings；Centre bore grinding is carried out on grinding machine, and (grinding wheel is contacted with centre bore at line, and jig main body rotates on centre frame, grinding speed Degree is 25m/s, can correct centre bore coaxiality error), therefore the positioning accuracy of centre bore when excircle of workpiece is ground can be improved.

The specific implementation of the step 2 is to adjust Grinder bench by the grinding to jig main body outer diameter (4) (15) cylindricity of deflection angle levelling jig main body adjusts grinding machine head stock frame by the grinding to jig main body shoulder end face (5) (14) with the flatness of tailstock (16) line of centres levelling jig main body, the grinding to told tungsten carbide coating thin-walled guide tube (W) It is ready；

Further, told centre bore (3) grinding uses white fused alumina grinding wheel (A) concrete model are as follows: B50 × 40 × 20 WA46- K8V。

Further, told jig main body outer diameter (4) and shoulder end face (5) grinding use white fused alumina grinding wheel (B) particular type Number are as follows: P400 × 40 × 127 WA120-H8V.

Further, the told white fused alumina grinding wheel end face (B) finishing, it is ensured that the end face of grinding wheel and outer diameter are at 80 °~90 ° Between modify, grinding wheel point side durability is high.

A kind of method for grinding of tungsten carbide coating thin-walled guide tube is told, based on to the tungsten carbide coating thin-walled guide tube foreign steamer The grinding technique of wide (outer circle, knuckle, end face, end chamfer) requires to determine grinding technique parameter, and to tungsten carbide Thin wall coated guide tube outer profile carries out grinding process control, it may be assumed that corase grinding working process parameter, half ground finish technique parameter, essence Grinding process parameter, super grinding working process parameter；

1) based on tell roughly grind working process parameter to told tungsten carbide coating thin-walled guide tube outer circle (17), knuckle (18) into Row corase grinding；

2) it is based on telling half corase grinding working process parameter to told tungsten carbide coating thin-walled guide tube outer circle (17), knuckle (18) Half is carried out to refine；

3) based on told ground finish technique parameter to told tungsten carbide coating thin-walled guide tube outer circle (17), knuckle (18), End face (19), end chamfer (20) are refined；

4) super grinding is carried out to told tungsten carbide coating thin-walled guide tube outer circle (17) based on told super grinding working process parameter；

Tell that corase grinding Excircle machining technological parameter is as follows:

Select grinding wheel: white fused alumina grinding wheel (B) model P400 × 40 × 127 WA120-H8V；

Workpiece rotational frequency: 150r/min；

Grinding speed: 35m/s；

Feeding speed: 0.4m/min；

Longitudinal finishing feed speed: 50mm/min；

Modify bite: 0.06mm；

The finishing number of strokes: 2；

Light repairs number: 0；

Tarry matter number: 1；

Workpiece surface roughness (Ra) before grinding: 1.6 μm；

Roughly grind parameter: back engagement of the cutting edge 0.01mm, bilateral feeding, processing capacity 0.15mm；

Tell that half ground finish technique parameter is as follows:

Select grinding wheel: 400 × 40 × 127 × 4 RVD of skive (C) model 1A1,80/100 B75；

Workpiece rotational frequency: 150r/min；

Grinding speed: 35m/s；

Feeding speed: 0.3m/min；

Headstock spindle revolving speed when finishing: 90r/min；

Longitudinal finishing feed speed: 25mm/min；

Modify bite: 0.02mm；

The finishing number of strokes: 2；

Light repairs number: 1；

Tarry matter number: 2；

Workpiece surface roughness (Ra) before grinding: 0.4 μm；

Half fine grinding parameter: back engagement of the cutting edge 0.01mm, bilateral feeding, processing capacity 0.1mm；

Told ground finish technique parameter is as follows:

Select grinding wheel: 400 × 40 × 127 × 4 RVD of skive (D) model 1A1,200/230 B75；

Workpiece rotational frequency: 100r/min；

Grinding speed: 17.5m/s；

Feeding speed: 0.2m/min；

Headstock spindle revolving speed when finishing: 50r/min；

Longitudinal finishing feed speed: 20mm/min；

Modify bite: 0.01mm；

The finishing number of strokes: 3；

Light repairs number: 1；

Tarry matter number: 4；

Workpiece surface roughness (Ra) before grinding: 0.2 μm；

Refine parameter: back engagement of the cutting edge 0.005mm, unilateral side feeding, processing capacity 0.04mm；

The super grinding working process parameter told is as follows:

Workpiece rotational frequency: 100r/min；

Grinding speed: 17.5m/s；

Feeding speed: 0.1m/min；

Headstock spindle revolving speed when finishing: 30r/min；

Longitudinal finishing feed speed: 10mm/min；

Modify bite: 0.005mm；

The finishing number of strokes: 3；

Light repairs number: 1；

Tarry matter number: 6；

Workpiece surface roughness (Ra) before grinding: 0.1 μm；

Super grinding parameter: back engagement of the cutting edge 0.001mm, unilateral side feeding, processing capacity 0.01mm；

Tell that fine grinding end face and end chamfer machined parameters are as follows:

Select grinding wheel: 50 × 25 × 13 × 6 RVD of skive (E) model 6A2,80/100 B50；

Workpiece rotational frequency: 40~80r/min；

Inner circle grinding wheel speed: 10000~15000r/min；

Headstock spindle revolving speed when finishing: 30~40r/min；

Modify bite: 0.005~0.01mm；

The finishing number of strokes: 3；

Light repairs number: 1；

Tarry matter: to no-spark；

Workpiece surface roughness (Ra) before grinding: 0.4 μm；

Parameter: back engagement of the cutting edge 0.005mm, unilateral side feeding are refined, processing capacity is 0.05~0.12mm；

1) the specific implementation are as follows: outside telling corase grinding working process parameter to told tungsten carbide coating thin-walled guide tube Circle, knuckle roughly ground the following steps are included:

1) grind: basal plane is that aluminum metal and the annulus being relatively large in diameter are ground in a manner of drawing a circle along clockwise direction when grinding basal plane Mill, each finger for pressing workpiece is firmly uniform, and constantly turning of work piece (clockwise direction), in case the basal plane of workpiece is ground Mill is inclined；It not apply excessive pressure when grinding, only gently push workpiece, increase contact area gradually, if workpiece basal plane is not It is flat, can be hanging by the low spot of basal plane stretching grinding plate, it only stays high point part on platform, pushes workpiece up and down, repair and grind high point；

2) clamping: by tungsten carbide coating thin-walled guide tube left side (basal plane) location and installation in (1) one end face outer rim of jig main body On shoulder (21), the bolt (23), copper flat of 10 fastening bolt holes (22) is equipped with by passing through along the circumferential direction uniformly distributed processing Washer (24), polymer plain washer (25) and fastening nut (26) are clamped workpiece；

3) centering: bolt is tightened within 0.01mm, and to point using the maximum outer circle bounce of amesdial (27) centering workpiece (23) it is fixedly clamped；

4) it is ground: grinding machine head stock frame (14), tailstock (16) will be loaded on equipped with the jig main body (1) of tungsten carbide coating thin-walled guide tube (W) Top (6) on, its told tungsten carbide coating thin-walled guide tube outer circle (17), knuckle (18) are roughly ground respectively；After mill Fixture is removed from grinding machine, lies against ground, machine oil (easy-clear after casting paraffin) is uniformly smeared in the outer circle of workpiece, to It is poured the later half fine ginding processing of paraffin.

2) the specific implementation are as follows: based on telling half ground finish technique parameter to told tungsten carbide coating thin-walled Guide tube outer circle (17), knuckle (18) carry out half fine grinding the following steps are included:

1) it grinds: grinding left side (basal plane) tungsten carbide coating thin-walled guide tube (W), and examine stained area to answer on verifying bench It is circumferentially uninterrupted greater than 95%()；

2) clamping: should repair at the grinding basal plane end of workpiece once with abrasive paper for metallograph before clamping, remove flash removed, and alcohol wipe is dry Only, it is housed to jig main body (1)；By tungsten carbide coating thin-walled guide tube (W) left side (basal plane) location and installation in jig main body (1) On the shoulder (21) of one end face outer rim, by passing through along the circumferential direction uniformly distributed bolt of the processing equipped with 10 fastening bolt holes (22) (23), copper plain washer (24), polymer plain washer (25) and fastening nut (26) are clamped workpiece；

3) wadding: filling in the cotton band of 20mm in workpiece bottom, and fortress on earth, not be connected cotton with the bottom of fixture, but It tamps, so that workpiece is sticked together with jig main body in order to avoid paraffin water flows on jig main body through cotton；This layer of cotton and stone Wax formed cylinder paraffin thin-walled ring, be supported by workpiece, form a kind of uniform equilibrant force, thus guarantee excircle of thin-walled workpiece with The concentricity of jig main body is fixed, and the clamping effect of cooperation is reached；

4) centering: the height of centering workpiece bottom circle on verifying bench, and make a mark, numerical value of signing, thereafter by fixture top Between lathe two is top, with magnetic force dial framework (28) clamp amesdial (27) to the large cylindrical diameter of workpiece bottom and bore portions into Row centering makes height and numerical value match with the position of previous centering and numerical value；

5) paraffin: being put into container by wax melting, so that it is melted into liquid with electromagnetic oven heating；

6) casting: atoleine is poured from top to bottom, and when being poured bottom, the temperature of paraffin water wants lower, to pour on the cotton Moment solidification is preferred, and after the paraffin of bottom thoroughly solidifies, then the cotton band for 10mm thickness being filled at workpiece aperture, cotton want pine It dissipates, facilitates the smooth inflow of paraffin water；

7) it solidifies: being laid flat after paraffin casting 3 hours (making paraffin solidifying saturating)；

8) be ground: by equipped with tungsten carbide coating thin-walled guide tube jig main body loaded on grinding machine head stock frame (14), tailstock (16) it is top (6) on, half is carried out to its told tungsten carbide coating thin-walled guide tube outer circle (17), knuckle (18) respectively and is refined；To workpiece into Half fine grinding of row, which can be used, to be cut, and improves removal rates, surplus to be ground carries out round-trip feed grinding, feed point when remaining 0.02mm again Selection is at the right end of workpiece, bilateral feeding grinding；It can be deformed in grinding process, therefore when being ground each neutral gear, Grinding taper has certain variation, to do fine tuning appropriate to taper at this time, enable the round and smooth connection of knuckle, such as fraction Taper is bad, can do partly appropriate (depth of cut is in 0.003-0.005mm)；

9) measure: the casting of paraffin water is extremely successful, measures excircle of workpiece scale with arch measuring tool after mill, advises measurement transition with R Fillet R value, due to the influence of temperature, there are temperature measurement is poor, need will be placed on table part (29) on Grinder bench (15), be allowed pair Table part and workpiece are cooled the cooling of liquid simultaneously, keep temperature consistent, numerical measuring is accurate；

10) change wax: being drenched after measurement with boiled water and scald excircle of workpiece, there is the variation expanded with heat and contract with cold by workpiece and jig main body, leaching is scalded Excircle of workpiece pins workpiece with hand and carries out circular motion, gently above mention and drawing off can melt the paraffin that workpiece inner wall is adhered to Workpiece.

3) the specific implementation are as follows: told tungsten carbide coating thin-walled is led based on told ground finish technique parameter Cylinder outer circle (17), knuckle (18), end face (19), end chamfer (20) refined the following steps are included:

1) clean: paraffin used is refined in removal half, and jig main body is cleaned up, should be before clamping by the upper and lower port of workpiece It is repaired with abrasive paper for metallograph, removes flash removed, alcohol wipe is clean, is packed into jig main body；

2) clamping: by tungsten carbide coating thin-walled guide tube left side (basal plane) location and installation in (1) one end face outer rim of jig main body On shoulder (21), the bolt (23), copper flat of 10 fastening bolt holes (22) is equipped with by passing through along the circumferential direction uniformly distributed processing Washer (24), polymer plain washer (25) and fastening nut (26) are clamped workpiece；It is equipped in jig main body (1) other end Internal screw thread (30) is mutually 3 8.5 holes Φ (31) and the jig main body internal screw thread of 120 ° of angles by passing through two-by-two at the top of end cap (30) connected M8 bolt (32) and washer (12) are clamped workpiece, this workpiece is relatively thin, can not exert oneself when stepping up Excessive, energy band of being subject to is started building part, just can be reduced workpiece ovalizing deflection after grinding in this way；

3) centering: workpiece (W) is packed into jig main body (1) and fixes, and light band end cap (33) is packed on grinding machine two top (6), pine together Open gland (33) use amesdial (27) centering workpiece grinding part both ends, using on the same section of workpiece to a centering 10 bolt (23) pressure values of method, left side uniformly will beat at the port table centering workpiece (W) and mark, tighten bolt Sequence gently to be tightened since the corresponding bolt of a certain outer diameter high point at interval of 1 bolt, until 10 bolts (23) all With good；Gently end cap (33) is buckled, and standby tight with 3, right side M8 bolt (32), plays table in mark point, check the compression of end cap Pressing force is adjusted in variation of the power to aperture, observes the indicator variation of each respective outer diameters in clamping process, table is seen after clamping Needle is how many when 4 heights read difference (4 each two of region height are to point), if after refining close or equal to half (before clamping) aperture ellipse amount should can refine within 0.01；

4) be ground: a) excircle of workpiece (17) and knuckle (18) are refined, feed point selection at the right end of workpiece and Grinding wheel not walked out to workpiece, unilateral side feeding feed grinding should take withdrawal by workpiece and grinding wheel point when being ground to size From, avoid abrasive wheel end face leave workpiece moment generate gnaw knife phenomenon；It is ground knuckle R value with scribing line reconditioning method, uses mark Pen marks visible marking in the minimum point of knuckle, and lines are more slightly wider (about 5mm or so), and remember feed dial scale value, move back Knife, upper slitter (outer diameter) concedes radius 0.004mm again, and visual abrasive wheel end face point side is linear, shakes workbench and longitudinally moves It starts to take turns (34), uses skive reconditioning workpiece knuckle again；B) to workpiece end face (19) and end chamfer (20) into Row fine grinding, is ground workpiece end face (19) and end chamfer (20) using inner circle grinding tool (35), the thickness of workpiece end face (19) Degree only has 4.3mm, due to workpiece end face easy buckling deformation after grinding, so when being ground end face, told skive (E) It is slightly longer in the residence time that workpiece end face is ground every time, a amesdial (27) can be propped up on grinder bed, feed is wanted Softly, it referring to the depth of cut of reconditioning end face, also can avoid accidentally hitting end face, grinding process will frequently play table, to find workpiece in time Jump situation, accomplishes to correct in time；When carrying out end chamfer grinding, skive (E) fillet surface width is greater than end face The width of chamfering, the depth of cut want small, feed again after no-spark；

5) it measures: measuring excircle of workpiece scale with arch measuring tool, advise measurement knuckle R value with R, jumped with amesdial measurement end face It is dynamic, end chamfer size is measured with universal protractor.

Further, based on extra tungsten carbide tumor is stained on angle faces, this angle faces, institute are ground using inner circle grinding tool (35) Tell inner circle grinding tool skive (E) concrete model are as follows: 50 × 25 × 13 × 6 RVD of 6A2,80/100 B50 uses amesdial (27) centering skive (E) outer circle bounce is not more than 0.005mm, carries out leveling installation, pay attention to the installation direction of angle with Workpiece end face chamfering is consistent.

A kind of tungsten carbide coating thin-walled guide tube method for grinding, 4) the specific implementation are as follows: thick based on telling It grinds parameter (processing capacity 0.15mm), Roundness of Workpiece is a kind of control ovalizing deflection method of 0.015~0.03mm after mill, implements tool Body step are as follows:

1) it is ground principle intermediate after using first both sides, it may be assumed that be first ground workpiece or so section, left and right section is ground consistent in bounce In the case of remove grinding workpiece interlude again, there is a knuckle in this workpiece left end, bad, the transition circle if left and right section is beated Angle can need not be ground in corase grinding, reserve 10-15mm length, cut when half refines and connect flat, especially grinding workpiece interlude Outer diameter needs not feed grinding, will improve grinding accuracy；

2) clamping force to workpiece on jig main body refines, it may be assumed that beaten at any time in grinding process table effect workpiece outer diameter and The variation of front and back is tightened in end face, to predict the diastole in aperture and shrink position and varying dimensions, if variation is excessive, by workpiece weight It is new to be packed into jig main body amesdial again centering, keep the screwing force of each bolt uniform as far as possible, the high point of workpiece is reprocessed, is repaired High point is ground, circle bounce is 0.015mm after mill, reaches the run-out tolerance that corase grinding requires.

The method for grinding of a kind of tungsten carbide coating thin-walled guide tube, based on told tungsten carbide coating thin-walled guide tube outer profile It carries out grinding process and controls the control measure being in grinding process, steps are as follows for told grinding process control measure:

1) check whether the coating in region to be ground has the defects of pit, peel off before processing；

2) basal plane of tungsten carbide coating thin-walled guide tube is ground；

3) centre bore is ground, checking by blueing check jig main body centre bore and top contact situation, top stained area In 95% or more (circumferentially uninterrupted), and clear up centre bore；

4) two top centering tungsten carbide coating thin-walled guide tube maximum outer circle run-out tolerance≤0.01 mm, grinding process size were ground Cheng Zhongruo discovery wheel loading should be modified in time；

5) grinding wheel installs forward and backward tune static balance, is positioned with dresser in table positions or two tops, modify grinding wheel outer diameter and End face is until wedge angle is sharp；

6) in tungsten carbide coating thin-walled guide tube grinding process, cutting fluid is at every moment sprayed；

7) measurement tungsten carbide coating thin-walled guide tube size after corase grinding, half fine grinding, fine grinding, demarcates high and low position and measures ruler It is very little；8) dimensional tolerance, form tolerance and the roughness required precision of final tungsten carbide coating thin-walled guide tube are detected；

The specific implementation of the step 4) are as follows: based on to the corase grinding told roughness requirements achieved, periodically repaired Whole white fused alumina grinding wheel (B), told corase grinding are mounted on external cylindrical dresser with dressing diamond, and external cylindrical dresser is mounted on work On platform, established angle is at 10 ° or so, the dressing diamond when apex angle of told dressing diamond (40) takes 70 °~80 ° amendments 0.5-1mm of grinding wheel center should be slightly below；The trim locations of dressing diamond cannot differ too big with grinding wheel position when grinding, Dressing diamond is when the lateral position of grinding wheel is located at grinding on similar position；With guarantee the micro- sword of grinding wheel contour and Cutting ability, and prevent workpiece when grinding from generating self-excited vibration；The finishing of told white fused alumina grinding wheel (A, B) fillet (R8, R3), In need to be repaired manually with green stone, it is whether qualified with saw blade examination mill R rule school inspection white fused alumina grinding wheel fillet, then carry out transition circle Angle R grinding.

The specific implementation of the step 4) are as follows: it is seldom modified based on the super-hard abrasive tool (skive) told, when When the working face of skive loses geometric accuracy and blunt, appropriate finishing must be done, but trim amount is few, by half fine grinding, essence Mill, super grinding roughness requirements achieved, periodically carry out finishing skive, and the diamond grinding wheel dressing told is a kind of Cylindrical finishing device；Tell a kind of cylindrical finishing device by mandrel (36), washer (12), green silicon carbide grinding wheel (F), nut (13) it forms, told mandrel (36) length is consistent with workpiece (W) length, improves the repetitive positioning accuracy of workpiece grinding, is told Spindle nose (37) is equipped with the diameter portion that matches with green silicon carbide grinding wheel (F) inner hole and screw thread, by its grinding wheel washer (12) and Nut (13) tightens fixation, and told spindle nose outer diameter need to carry out static balance leveling to skive with after skive clamping, Its outer diameter circle beats required precision no more than 0.015mm, and told shaft end (38) is equipped with taper and collet (39) are implemented tapered sleeve and consolidated It is fixed, using " Double Tops point " and " grinding wheel repairs grinding wheel " to diamond grinding wheel dressing, to guarantee after grinding workpiece size tolerance and thick Rugosity requirement；Due to the finishing of skive (C, D, E) outer diameter, not forming for original fillet is caused, is needed with green carbonization Silica sand wheel (F) does slight finishing, first refine end surface of diamond grinding wheel, then refine skive point side manually, tries to grind with saw blade It is whether qualified with R rule school inspection skive fillet, then carry out the grinding of knuckle R value.

Further, grinding wheel used in a kind of cylindrical finishing device is green silicon carbide grinding wheel (F), concrete model Are as follows: P100 × 30 × 20 GC60-M8V.

A kind of method for grinding of tungsten carbide coating thin-walled guide tube, the specific implementation of the step 5) are as follows: be based on Told skive is mostly once looked for symmetrically when for the first time using leveling than the leveling of plain wheel (such as white fused alumina grinding wheel), The required precision for paying attention to grinding wheel installation is asked, dimensional tolerance is inaccurate because grinding force slightly unevenly will result in, roughness High and damage coating；With fastening skive after amesdial centering skive outer diameter symmetric points, it is therefore intended that diamond The oval correction amount of grinding wheel reaches minimum, unloads skive later and carries out plain wheel installation leveling；

Installation steps are as follows:

1) measurement of planeness of ring flange (40), generally no greater than 0.01mm are needed first；

2) guarantee that grinding wheel spindle (41) necessary straight smooth pieces are lossless, major axis size must be in the margin of tolerance；

3) grinding wheel allows for freely being installed on main shaft (41) or flange (42) (Φ 175 × 88 × 127)；

4) it must be lined with flange paper washer (44), and to reveal between grinding wheel and chuck (43) seal face in ring flange (40) circumferential exterior 2mm or more out；

It 5), should be by diagonal sequence, in several times when multiple six sides fastening bolts (45) are tightened when installation for the flange of Multi-point fastening Gradually tighten；

Leveling step is as follows:

1) (modifying after the static balance of new grinding wheel elder generation) first should be modified on grinding machine before grinding wheel static balancing；

2) balancing stand is adjusted with level meter, the plane for forming two cylinders (edge of a knife) is no more than 0.04/ in vertical equity instrument reading 1000 are no more than 0.06/1000 with lateral；

3) whole balance weights (46) are unloaded, insertion balance mandrel, sets and is slowly rolled after it stands on balancing stand in chuck hole, It is marked " # " at grinding wheel most next point S with marking pen, this point is center of gravity (Figure 17 A), fastens first piece relative to S Balance weight (46) tightens fixation with six side's screws (47), this block no longer moves (Figure 17 B) later, balances simultaneously for first piece Block (46) fastens other two pieces of balance weights (46), is then placed on grinding wheel again on balancing stand and slowly rolls, such as still uneven, only Two pieces of balance weights (Figure 17 C) need to be symmetrically moved, until grinding wheel can stop in any position, static balance comes to an end.

A kind of method for grinding of tungsten carbide coating thin-walled guide tube, the specific implementation of the step 6) are as follows: select Told high-speed dedicated grinding fluid, model RM-003, it is dissolved in water, dilution ratio are as follows: cutting fluid 3%~5%, clean water 97%~95%.

A kind of method for grinding of tungsten carbide coating thin-walled guide tube, the specific implementation of the step 7) are as follows: told A kind of arch measuring tool of the detection of excircle dimension, told arch measuring tool is by toxoplasm (48), measurement matrix (49), fastening screw (10), positioning body (50) and amesdial (27) composition, told positioning body (50) is equipped with center positioning hole (51), by its amesdial (27) adjustable fixation is carried out under the tightening of fastening screw (10), tells that measuring matrix (49) with the contact of workpiece (W) is point Or face, arch measuring tool realize the measurement of different shape, different scale workpiece outer diameter, also achieve form tolerance (circularity and circle Column degree) measurement, told arch measuring tool is exactly with to table part (29) or gauge block to be combined into dimensional tolerance length, is measured using method of comparison Whether outer circle is qualified；The inspection amount of the dimensional tolerances of told knuckle is advised with a kind of R, and told R rule are exactly with the outer radius on ruler It goes to compare, it is whether qualified using light gap method measurement circular arc；A kind of omnipotent angle of the inspection amount of the dimensional tolerances for the end chamfer told Spend ruler, told universal protractor be exactly on bevel protractor ruler and base ruler adjusts qualification angle on main scale in contrast, it is sharp It is whether qualified with light gap method measurement end chamfer；A kind of amesdial of the inspection amount of the line position tolerance of told end face, told amesdial (27) in the folder hole of magnetic force dial framework (28), dial framework seat (52) can be horizontally or vertically adsorbed on grinding machine when work, carry out shape The detection of position tolerance (circle bounce), it is whether qualified using amesdial measurement end face run-out.

A kind of method for grinding of tungsten carbide coating thin-walled guide tube, the specific implementation of the step 8) are as follows: described Tungsten carbide coating thin-walled guide tube roughness (Ra) after refining is 0.06~0.2 μm；Circular Run-out Tolerance be 0.0015~ 0.0022mm, flatness 0.003mm；Tungsten carbide coating thin-walled guide tube circularity after super grinding is 0.003mm, cylindricity For 0.005mm, outer circle is 0.005mm to the verticality of end face.

A kind of method for grinding of tungsten carbide coating thin-walled guide tube, told grinding machine include:

Tell a frame (14): headstock spindle (53) revolving speed is that 20-220r/min(is stepless), head frame top (6-1) is Mohs 5#；

Told tailstock (16): tailstock centre (6-2) is Mohs 4#；

Told grinding carriage (54): outer circle grinding wheel (B, C, D) linear velocity is 35m/s or 17.5m/s, (55) one turns of grinding carriages of handwheel (54) amount of movement is 1mm；It is that 0.005mm(is thick that (55) one lattice grinding carriage of handwheel, which feeds big handwheel (55-1) amount of movement), handwheel It is that 0.001mm(is thin that (55) one lattice grinding carriages, which feed small handwheel (55-2) amount of movement), grinding carriage (54) fast advance and retreat amount is 20mm, Grinding carriage (54) angle of revolution is ± 30 °；

Told inner circle grinding tool (35): inner circle grinding wheel (56) full-size is 50 × 25 × 13(mm), inner circle grinding wheel (56) minimum ruler Very little is 15 × 20 × 5(mm), inner circle grinding wheel spindle (79) 10000~15000r/min of revolving speed；

Told workbench (15): (55) one revolving worktable (15) amount of movement of handwheel is 6mm, and minimum longitudinal movement amount is 500mm, most Big longitudinal movement amount is 1500mm, and workbench (15) maximum angle of revolution is for 3 ° clockwise and 4 °~6 ° counterclockwise；

Told cooling system: cooling pump model AYB-25GC, flow 25L/min；

Told crushing and compensation feeding: operation handwheel (55) manual lateral feeding, operation element platform vertically move handwheel (34) manual length feed.

The present invention is applied to the grinding of sprayed wc thin-wall workpiece, will obtain following technical effect:

1. in terms of mass: in sprayed wc, in fillet, chamfering, edge due to point discharge or marginal discharge effect, holding Easily in these place accumulation tungsten carbide tumors, corase grinding uses white fused alumina grinding wheel, and white fused alumina grinding wheel has that density is big, and sand grains is easy to fall off Characteristic, can effective place to go surface carbonation tungsten tumor；Half fine grinding, fine grinding, super grinding use skive, and skive has Density is high, and the sharp characteristic of abrasive grain wedge angle can improve the surface quality of workpiece；Method for grinding in this way, is ground out Workpiece be able to satisfy production engineering specifications, improve the qualification rate of product.

2. secure context: when 1) using conventional wheel grinding, in grinding process, coating surface is in cutting force and cutting heat Under the action of, get higher coated substrate faying face and grinding skin mean temperature, conventional grinding wheel is easily broken by high temperature and pressure temperature, makes When with diamond wheel grinding, personal safety is protected；2) paraffin water also has pollution, especially summer to be poured environment, Operator will also bear the hardship of high temperature in fusing wax, and there is also the security risks to people for heated paraffin casting；Semifinishing, finishing Work, microstoning replace casting paraffin, reduce the pollution to human and environment.

3. in terms of benefit: workpiece is thinning after corase grinding white fused alumina grinding wheel, mill, so reasonable select grinding wheel can be with It is effectively prevent piece surface burn and thermal stress deformation, to reduce the probability that the defects of surface cracks, coating bursts apart generates, Skive is used instead in fine grinding, reduces grinding plastic deformation and metal structure variation；The price of two kinds of grinding wheels is different, white fused alumina Grinding wheel is cheap, and skive is expensive, and under the process conditions for meeting product, such processing method can reduce cost.

In short, in grinding, grinding machine, fixture, grinding wheel and workpiece constitute a complete process system, in pouring for cutting fluid It pours down, by grinding process as corase grinding, fine grinding, super grinding, realizes efficient, high-accuracy, the high table of tungsten carbide difficult-to-machine material The grinding of face integrality.

Detailed description of the invention

Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.

Fig. 1 is a kind of tungsten carbide coating thin-walled guide tube jig main body fine grinding two sides centre bore conical surface schematic diagram of the present invention.

Fig. 2 is the partial enlarged view of Fig. 1 centre bore conical surface grinding.

Fig. 3 is a kind of tungsten carbide coating thin-walled guide tube jig main body outer diameter of the present invention and shoulder cross grinding schematic diagram.

Fig. 4 is that the embodiment of the present invention provides a kind of tungsten carbide coating thin-walled guide tube grinding flow chart.

Fig. 5 is a kind of tungsten carbide coating thin-walled guide tube fixture schematic diagram of the present invention.

Fig. 6 is a kind of tungsten carbide coating thin-walled guide tube outer profile (outer circle, knuckle) grinding schematic diagram of the present invention.

Fig. 7 is a kind of tungsten carbide coating thin-walled guide tube outer profile (end face, end chamfer) grinding schematic diagram of the present invention.

Fig. 8 is a kind of tungsten carbide coating thin-walled guide tube corase grinding of the present invention, half accurate grinding clamping centering schematic diagram.

Fig. 9 is that a kind of tungsten carbide coating thin-walled guide tube of the present invention half refines casting schematic diagram.

Figure 10 is a kind of tungsten carbide coating thin-walled guide tube fine grinding of the present invention, super grinding clamping centering schematic diagram.

Figure 11 is the schematic diagram of arch measuring tool of the present invention.

Figure 12 is the schematic diagram of dressing diamond installation site of the present invention.

Figure 13 is the schematic diagram of dressing diamond operating position of the present invention.

Figure 14 is a kind of schematic diagram of the diamond grinding wheel dressing of the present invention with cylindrical finishing device.

Figure 15 is grinding wheel supported flange disk scheme of installation of the present invention.

Figure 16 is grinding wheel supported flange disk installation main shaft schematic diagram of the present invention.

Figure 17 is grinding wheel static balancing centering schematic diagram of the present invention.

Figure 18 is the main view of grinding machine in embodiment of the present invention.

Wherein in Fig. 1 into Figure 18:

1 is jig main body, and 2 be the center hole conical surface, and 3 be center hole, and 4 be jig main body outer diameter, and 5 be shoulder end face, 6 be it is top, 6-1 is that head frame is top, and 6-2 is tailstock centre, and frame centered on 7,8 be pull rod, and 9 be driver plate, and 10 be fastening screw, and 11 be spring, 12 be washer, and 13 be nut, and 14 be head frame, and 15 be workbench, and 16 be tailstock, and 17 be guide tube outer circle, and 18 be knuckle, and 19 are End face, 20 be end chamfer, and 21 be shoulder, 22 be fastening bolt holes, and 23 be bolt, and 24 be copper plain washer, and 25 be polymer Plain washer, 26 be fastening nut, and 27 be amesdial, and 28 be magnetic force dial framework, and 29 is, to table part, 30 are internal screw thread, and 31 be Φ 8.5 Hole, 32 be M8 bolt, and 33 be end cap, and 34 vertically move handwheel for workbench, and 35 be inner circle grinding tool, and 36 be mandrel, and 37 be spindle nose, 38 be shaft end, and 39 be collet, and 40 be ring flange, and 41 be main shaft, and 42 be flange, and 43 be chuck, and 44 be flange paper washer, and 45 be six sides Fastening bolt, 46 be balance weight, and 47 be six side's screws, and 48 be toxoplasm, and 49 be measurement matrix, and 50 be positioning body, centered on 51 Location hole, 52 be dial framework seat, and 53 be headstock spindle, and 54 be grinding carriage, and 55 be handwheel, and 55-1 is that grinding carriage feeds big handwheel, 55- 2 feed small handwheel for grinding carriage, and 56 be inner circle grinding wheel, and 57 be inner circle grinding wheel spindle, and 58 be dressing diamond, and 59 be head frame Inching button, 60 be workbench reverse lever, and 61 be coolant liquid switch handle, and 62 be inner circle grinding tool off-position positioning pin hand Handle, 63 be mobile barrel of tail stock handle, and 64 be outer circle grinding wheel motor high, low speed select button, and 65 be headstock spindle revolving speed Table, 66 adjust the speed knob for headstock spindle, and 67 open for cooling pump motor, stop selecting knob, and 68 be work stretch pressure adjusting knob, 69 use collision block (right side) to adjust lathe of work level angle screw rod, 70 for workbench commutation, and 71 be grinding carriage fast advance and retreat handle, and 72 are The speed of table selects knob, and 73 adjust the speed knob for crushing, and 74 be speed of table adjusting knob, and 75 commutate for workbench With collision block (left side), W is workpiece (tungsten carbide coating thin-walled guide tube), and A is white fused alumina grinding wheel concrete model: B 50 × 40 × 20 WA46-K8V, B are white fused alumina grinding wheel concrete model: P 400 × 40 × 127 WA120-H8V, C are skive particular type Number: 400 × 40 × 127 × 4 RVD of 1A1 80/100 B75, D are skive concrete model: 1A1 400 × 40 × 127 × 4 RVD 200/230 B75, E are skive concrete model: 50 × 25 × 13 × 6 RVD of 6A2 80/100 B50, F For green silicon carbide grinding wheel concrete model: P100 × 30 × 20 GC60-M8V.

Specific embodiment:

Specific embodiment one

Technical solution provided by the invention is illustrated in more detail below with reference to Fig. 1 to Figure 18.

As shown in Fig. 1 to 3 and Figure 18, a kind of method for grinding of tungsten carbide coating thin-walled guide tube fixture, based on by following The step is ground fixture, controls grinding movement and crushing movement, by operation grinding machine to fixture It is ground, improves the positioning accuracy of workpiece；

It is described that specific step is as follows:

1) the 1 two sides centre bore conical surface 2 of fine-grinding fixture main body；

2) fine-grinding fixture body outer diameter 4 and shoulder end face 5 are positioned with centre bore 3；

3) with two planes of surface grinding machine fine grinding end cap 33；

The specific implementation of the step 1) is by two centre bores 3 top 6 and 7 clamping of centre frame, the institute of jig main body Tell that fixed device is made of pull rod 8, driver plate 9, fastening screw 10, spring 11, washer 12 and nut 13；

Its clamping method is as follows: using the centre bore 3 of jig main body one end as positioning datum, jig main body 1 being used spring force It is supported on top 6 and is tightened with 12 fixture nut 13 of washer, the location hole that pull rod 8 passes through driver plate 9 is fixed in grinding machine head stock frame On 14,9 axial restraint of driver plate is realized, fastening screw 10 is tightened and realizes the circumferentially fixed of driver plate 9；And its right end centre frame 7 Bearing, since centre bore and jig main body outer circle have very high position precision, and it is top will not turn in jig main body one end, therefore can Eliminate the influence that the radial circular run-out error of grinding machine head stock frame spindle end processes jig main body；Centre bore grinding is carried out on grinding machine (grinding wheel is contacted with centre bore at line, and jig main body rotates on centre frame, and it is coaxial can to correct centre bore by grinding speed 25m/s Spend error), therefore the positioning accuracy of centre bore when excircle of workpiece is ground can be improved.

The specific implementation of the step 2 is that Grinder bench 15 is adjusted by the grinding to jig main body outer diameter 4 partially Swinging aligns the cylindricity of jig main body, adjusts grinding machine head stock frame 14 and tailstock by the grinding to jig main body shoulder end face 5 16 lines of centres align the flatness of jig main body, are ready to the grinding of told tungsten carbide coating thin-walled guide tube；

Further, the told grinding of centre bore 3 uses white fused alumina grinding wheel A concrete model are as follows: B50 × 40 × 20 WA46-K8V.

Further, told jig main body outer diameter 4 and the grinding of shoulder end face 5 use white fused alumina grinding wheel B concrete model are as follows: P400×40×127 WA120-H8V。

Further, the told end face white fused alumina grinding wheel B finishing, it is ensured that the end face of grinding wheel and outer diameter 80 °~90 ° it Between modify, grinding wheel point side durability is high.

Specific embodiment two

As shown in Fig. 4 to 10 and Figure 18, a kind of method for grinding of tungsten carbide coating thin-walled guide tube, told grinding machine includes:

Tell a frame 14: 53 revolving speed of headstock spindle is that 20-220r/min(is stepless), the top 6-1 of head frame is Mohs 5#；

Told tailstock 16: tailstock centre 6-2 is Mohs 4#；

Told grinding carriage 54: outer circle grinding wheel B, C, D linear velocity is 35m/s or 17.5m/s, 55 turns of 54 amount of movements of grinding carriage of handwheel For 1mm；It is that 0.005mm(is thick that 55 1 lattice grinding carriage of handwheel, which feeds big handwheel 55-1 amount of movement), the feeding of 55 1 lattice grinding carriage of handwheel Small handwheel 55-2 amount of movement be 0.001mm(it is thin), 54 fast advance and retreat amount of grinding carriage be 20mm, 54 angle of revolution of grinding carriage be ± 30°；

Told inner circle grinding tool 35: 56 full-size of inner circle grinding wheel is 50 × 25 × 13(mm), 56 minimum dimension of inner circle grinding wheel is 15 × 20 × 5(mm), 79 10000~15000r/min of revolving speed of inner circle grinding wheel spindle；

Told workbench 15: 55 1 revolving worktable of handwheel, 15 amount of movement is 6mm, and minimum longitudinal movement amount is 500mm, maximum longitudinal Amount of movement is 1500mm, and the maximum angle of revolution of workbench 15 is for 3 ° clockwise and 4 °~6 ° counterclockwise；

Told cooling system: cooling pump model AYB-25GC, flow 25L/min；

Told crushing and compensation feeding: operation 55 manual lateral of handwheel feeding, operation element platform vertically move 34 hand of handwheel Dynamic length feed.

Further, by operating grinding machine others component, the grinding process of its specific implementation is preferably annotated；

A kind of tungsten carbide coating thin-walled guide tube method for grinding, based on to tungsten carbide coating thin-walled guide tube outer profile (outer circle, mistake Cross fillet, end face, end chamfer) grinding technique require determine grinding technique parameter, it may be assumed that corase grinding working process parameter, Half ground finish technique parameter, ground finish technique parameter, super grinding working process parameter；

1) it is based on telling that corase grinding working process parameter carries out slightly told tungsten carbide coating thin-walled guide tube outer circle 17, knuckle 18 Mill；

2) it is based on telling that half corase grinding working process parameter carries out told tungsten carbide coating thin-walled guide tube outer circle 17, knuckle 18 Half refines；

3) based on told ground finish technique parameter to told tungsten carbide coating thin-walled guide tube outer circle 17, knuckle 18, end face 19, end chamfer 20 is refined；

4) super grinding is carried out to told tungsten carbide coating thin-walled guide tube outer circle 17 based on told super grinding working process parameter；

Select grinding wheel: white fused alumina grinding wheel Type B number is P400 × 40 × 127 WA120-H8V；

Workpiece rotational frequency: 150r/min(adjusts headstock spindle and adjusts the speed knob 66, so that headstock spindle revolution counter 65 reaches workpiece rotational frequency 150r/min)；

Grinding speed: 35m/s(adjusts outer circle grinding wheel motor high, low speed select button 64, reaches grinding speed 35m/ S)；

Feeding speed: 0.4m/min(unscrews the speed of table and selects knob 72, adjusts speed of table adjusting knob 74 and to reach To feeding speed 0.4m/min)；

Longitudinal finishing feed speed: 50mm/min(adjusts crushing speed regulation knob 73 and to reach longitudinal finishing feed speed 50mm/min)；

Modify bite: 0.06mm；

The finishing number of strokes: 2；

Light repairs number: 0；

Tarry matter number: 1；

Workpiece surface roughness (Ra) before grinding: 1.6 μm；

Tell that half ground finish technique parameter is as follows:

Select grinding wheel: skive c-type number is 400 × 40 × 127 × 4 RVD of 1A1,80/100 B75；

Feeding speed: 0.3m/min(unscrews the speed of table and selects knob 72, adjusts speed of table adjusting knob 74 and to reach To feeding speed 0.3m/min)；

Headstock spindle revolving speed when finishing: 90 r/min(adjust headstock spindle and adjust the speed knob 66, so that headstock spindle revolution counter 65 reaches To workpiece rotational frequency 90r/min)；

Longitudinal finishing feed speed: 25mm/min(adjusts crushing speed regulation knob 73 and to reach longitudinal finishing feed speed 25mm/min)；

Modify bite: 0.02mm；

The finishing number of strokes: 2；

Light repairs number: 1；

Tarry matter number: 2；

Workpiece surface roughness (Ra) before grinding: 0.4 μm；

Told ground finish technique parameter is as follows:

Select grinding wheel: 400 × 40 × 127 × 4 RVD of skive D model 1A1,200/230 B75；

Workpiece rotational frequency: 100r/min(adjusts headstock spindle and adjusts the speed knob 66, so that headstock spindle revolution counter 65 reaches workpiece rotational frequency 100r/min)；

Grinding speed: 17.5m/s(adjusts outer circle grinding wheel motor high, low speed select button 64, reaches grinding speed 17.5m/s)；

Feeding speed: 0.2m/min(unscrews the speed of table and selects knob 72, adjusts speed of table adjusting knob 74 and to reach To feeding speed 0.2m/min)；

Headstock spindle revolving speed when finishing: 50 r/min(adjust headstock spindle and adjust the speed knob 66, so that headstock spindle revolution counter 65 reaches To workpiece rotational frequency 50r/min)；

Longitudinal finishing feed speed: 20mm/min(adjusts crushing speed regulation knob 73 and to reach longitudinal finishing feed speed 20mm/min)；

Modify bite: 0.01mm；

The finishing number of strokes: 3；

Light repairs number: 1；

Tarry matter number: 4；

Workpiece surface roughness (Ra) before grinding: 0.2 μm；

The super grinding working process parameter told is as follows:

Feeding speed: 0.1m/min(unscrews the speed of table and selects knob 72, adjusts speed of table adjusting knob 74 and to reach To feeding speed 0.1m/min)；

Headstock spindle revolving speed when finishing: 30r/min(adjusts headstock spindle and adjusts the speed knob 66, so that headstock spindle revolution counter 65 reaches To workpiece rotational frequency 30r/min)；

Longitudinal finishing feed speed: 10mm/min(adjusts crushing speed regulation knob 73 and to reach longitudinal finishing feed speed 10mm/min)；

Modify bite: 0.005mm；

The finishing number of strokes: 3；

Light repairs number: 1；

Tarry matter number: 6；

Workpiece surface roughness (Ra) before grinding: 0.1 μm；

Select grinding wheel: 50 × 25 × 13 × 6 RVD of skive E model 6A2,80/100 B50；

Workpiece rotational frequency: 40~60r/min(adjusts headstock spindle and adjusts the speed knob 66, so that headstock spindle revolution counter 65 reaches workpiece 40~60r/min of revolving speed)；

Inner circle grinding wheel speed: 10000~15000 r/min；

Headstock spindle revolving speed when finishing: 30~40r/min(adjusts headstock spindle and adjusts the speed knob 66, so that headstock spindle revolution counter 65 reach 30~40r/min of workpiece rotational frequency)；

Modify bite: 0.005~0.01mm；

The finishing number of strokes: 3；

Light repairs number: 1；

Tarry matter: to no-spark；

Workpiece surface roughness (Ra) before grinding: 0.4 μm；

2) clamping: by tungsten carbide coating thin-walled guide tube left side (basal plane) location and installation 1 one end face outer rim of jig main body platform On shoulder 21, the bolt 23, copper plain washer 24, modeling that are equipped with 10 fastening bolt holes 22 by passing through along the circumferential direction uniformly distributed processing Matter plain washer 25 and fastening nut 26 are clamped workpiece；

3) it centering: by pressing a frame inching button 59, is beated using the maximum outer circle of 27 centering workpiece of amesdial in 0.01mm Within, and bolt 23 is tightened to point and is fixedly clamped；

4) it is ground: the jig main body 1 of tungsten carbide coating thin-walled guide tube W will be housed, by moving mobile barrel of tail stock handle 63 Loaded on grinding machine head stock frame 14, tailstock 16 top 6 on, while turn work stretch pressure adjusting knob 68 adjust pretightning force；Unscrewing Cooling pump motor is opened, stops selecting knob 67, and 15 shift position of workbench is adjusted, and is made by operating grinding carriage fast advance and retreat handle 71 Grinding carriage 54 is quickly introduced, and is adjusted the rotation of headstock spindle 53 and is reached headstock spindle tachometer value, opens coolant liquid switch handle 61, it carries out grinding carriage and feeds big handwheel 55-1 Fine Feed, respectively to its told tungsten carbide coating thin-walled guide tube outer circle 17, transition circle It is roughly ground at angle 18；After corase grinding is machined to qualification, grinding carriage 54 is quickly exited, and 53 turns of headstock spindle are stopped, and coolant liquid is closed, workbench 15 stop, and unload workpiece W；Fixture is removed from grinding machine after mill, lies against ground, machine oil is uniformly smeared in the outer circle of workpiece and (is poured Easy-clear after note paraffin), the later half fine ginding processing of paraffin to be cast.

2) the specific implementation are as follows: based on telling half ground finish technique parameter to told tungsten carbide coating thin-walled Guide tube outer circle 17, knuckle 18 carry out half fine grinding the following steps are included:

1) it grinds: the grinding left side tungsten carbide coating thin-walled guide tube W (basal plane), and examine stained area big on verifying bench It is circumferentially uninterrupted in 95%()；

2) clamping: should repair at the grinding basal plane end of workpiece once with abrasive paper for metallograph before clamping, remove flash removed, and alcohol wipe is dry Only, it is housed to jig main body 1；By tungsten carbide coating thin-walled guide tube (W) left side (basal plane) location and installation in 1 one end of jig main body On the shoulder 21 of face outer rim, the bolt 23, copper of 10 fastening bolt holes 22 is equipped with by passing through along the circumferential direction uniformly distributed processing Plain washer 24, polymer plain washer 25 and fastening nut 26 are clamped workpiece；

4) centering: the height of centering workpiece bottom circle on verifying bench, and make a mark, numerical value of signing, thereafter by fixture top Between lathe two is top, by pressing a frame inching button 59, amesdial (27) are clamped to workpiece bottom with magnetic force dial framework (28) The large cylindrical diameter and bore portions in portion carry out centering, and height and numerical value is made to match with the position of previous centering and numerical value；

8) it is ground: the jig main body 1 equipped with tungsten carbide coating thin-walled guide tube is filled by moving mobile barrel of tail stock handle 63 In grinding machine head stock frame 14, tailstock 16 top 6 on, while turn work stretch pressure adjusting knob 68 adjust pretightning force；It unscrews cold But pump motor is opened, stops selecting knob 67, adjusts 15 shift position of workbench, makes sand by operating grinding carriage fast advance and retreat handle 71 Wheel carrier 54 is quickly introduced, and is adjusted the rotation of headstock spindle 53 and is reached headstock spindle tachometer value, opens coolant liquid switch handle 61, It carries out grinding carriage and feeds big handwheel 55-1 Fine Feed, respectively to its told tungsten carbide coating thin-walled guide tube outer circle 17, knuckle 18, which carry out half, refines；Workpiece is carried out partly refining can be used cutting, improves removal rates, when surplus to be ground remains 0.02mm, is led to Cross operation element platform reverse lever 60 make workpiece W 75 workbench of workbench commutation collision block (left side) commutation with collision block (right side) 70 it Between carry out round-trip feed grinding, feed point selects at the right end of workpiece, bilateral feeding grinding；Change can be generated in grinding process Shape, therefore when being ground each neutral gear, grinding taper has certain variation, adjusts lathe of work level angle screw rod by turning 69, it carries out the taper of 15 angle of revolution of workbench clockwise or counterclockwise and does appropriate fine tuning, enable the round and smooth connection of knuckle, such as Fraction taper is bad, can do partly appropriate (depth of cut is in 0.003-0.005mm)；After half fine grinding to qualification, Grinding carriage 54 quickly exits, and 53 turns of headstock spindle are stopped, and coolant liquid is closed, and workbench 15 stops, and unloads workpiece W；

9) measure: the casting of paraffin water is extremely successful, measures excircle of workpiece scale with arch measuring tool after mill, advises measurement transition with R Fillet R value, due to the influence of temperature, there are temperature measurement is poor, need will be placed on Grinder bench 15 table part 29, allow to table part It is cooled the cooling of liquid simultaneously with workpiece, keeps temperature consistent, numerical measuring is accurate；

3) the specific implementation are as follows: told tungsten carbide coating thin-walled is led based on told ground finish technique parameter Cylinder outer circle 17, knuckle 18, end face 19, end chamfer 20 refined the following steps are included:

2) clamping: by tungsten carbide coating thin-walled guide tube left side (basal plane) location and installation 1 one end face outer rim of jig main body platform On shoulder 21, the bolt 23, copper plain washer 24, modeling that are equipped with 10 fastening bolt holes 22 by passing through along the circumferential direction uniformly distributed processing Matter plain washer 25 and fastening nut 26 are clamped workpiece；It is equipped with internal screw thread 30 in 1 other end of jig main body, by passing through It is mutually M8 bolt 32 and washer that 8.5 hole 31 3 Φ of 120 ° of angles is connected with jig main body internal screw thread 30 two-by-two at the top of end cap 12 are clamped workpiece, this workpiece is relatively thin, can not be firmly excessive when stepping up, and energy band of being subject to is started building part, so It can be reduced workpiece ovalizing deflection after grinding；

3) centering: workpiece W is packed into jig main body 1 and fixes, and light band end cap 33 is packed on grinding machine two top 6 together, unclamps gland 33 With the both ends of 27 centering workpiece grinding part of amesdial, using on the same section of workpiece to an aligning method, left side 10 23 pressure values of bolt uniformly will beat at the port table centering workpiece W and mark, tighten bolt sequence will from it is a certain outside The corresponding bolt of diameter high point starts, and gently tightens at interval of 1 bolt, until 10 bolts 23 are all with good；Gently end cap 33 It buckles, and standby tight with 3, right side M8 bolt 32, plays table in mark point, check variation of the pressing force to aperture of end cap, adjust Pressing force observes the indicator variation of each respective outer diameters in clamping process, sees that indicator reads difference in 4 heights after clamping When how many (4 each two of regions height are to point), if aperture ellipse amount, Ying (before clamping) after being refined close or equal to half Within 0.01, it can refine；

4) it is ground: a) by the fixture equipped with tungsten carbide coating thin-walled guide tube by moving mobile barrel of tail stock handle 63 loaded on mill Bed head frame 14, tailstock 16 top 6 on, while turn work stretch pressure adjusting knob 68 adjust pretightning force；Unscrew cooling pump Motor is opened, stops selecting knob 67, and 15 shift position of workbench is adjusted, and makes grinding carriage by operating grinding carriage fast advance and retreat handle 71 54 quickly introduce, and adjust the rotation of headstock spindle 53 and reach headstock spindle tachometer value, open coolant liquid switch handle 61, carry out Grinding carriage feeds small handwheel 55-2 Fine Feed, refines to excircle of workpiece 17 and knuckle 18, and feed point is selected in workpiece Right end at and grinding wheel not walk out to workpiece, unilateral side feeding feed grinding；When being ground to size, withdrawal should be taken work Part is separated with grinding wheel, avoid abrasive wheel end face leave workpiece moment generate gnaw knife phenomenon；Knuckle R is ground with scribing line reconditioning method Value, marks visible marking in the minimum point of knuckle with marking pen, lines are more slightly wider (about 5mm or so), and remember feed disk Scale value, withdrawing, upper slitter (outer diameter) concedes radius 0.004mm again, and visual abrasive wheel end face point side is linear, shakes work Platform vertically moves handwheel 34, feeds small handwheel 55-2 Fine Feed by operation grinding carriage, uses skive reconditioning workpiece again Knuckle；B) workpiece end face 19 and end chamfer 20 are refined using inner circle grinding tool 35, opens inner circle grinding tool inoperative Position positioning pin handle 62 unscrews cooling pump motor and opens, stops selecting knob 67, adjusts 15 shift position of workbench, pass through operation Grinding carriage fast advance and retreat handle 71 introduces grinding carriage 54 quickly, adjusts the rotation of headstock spindle 53 and reaches headstock spindle revolving speed Value opens coolant liquid switch handle 61, carries out grinding carriage and feeds big handwheel 55-2 Fine Feed,

Workpiece end face 19 and end chamfer 20 are ground；The thickness of workpiece end face 19 only has 4.3mm, since workpiece end face exists Easy buckling deformation after grinding, so when being ground end face, residence time that told skive E is ground every time in workpiece end face It is slightly longer, a amesdial 27 can be propped up on grinder bed, feed is soft, can also referring to the depth of cut of reconditioning end face It avoids accidentally hitting end face, grinding process will frequently play table, to find that workpiece jumps situation in time, accomplish to correct in time；It is being held When surface chamfer is ground, skive E fillet surface width is greater than the width of end chamfer, and the depth of cut wants small, after no-spark again Feed；After fine grinding to qualification, grinding carriage 54 is quickly exited, and 53 turns of headstock spindle are stopped, and coolant liquid is closed, and workbench 15 stops, unloads Workpiece W；

Further, based on extra tungsten carbide tumor is stained on angle faces, this angle faces is ground using inner circle grinding tool 35, is told Inner circle grinding tool skive E concrete model are as follows: 50 × 25 × 13 × 6 RVD of 6A2,80/100 B50 is looked for amesdial 27 Positive skive E outer circle bounce is not more than 0.005mm, carries out leveling installation, pays attention to the installation direction and workpiece end face of angle Chamfering is consistent.

Specific embodiment three

As shown in Figure 11 to Figure 17, a kind of method for grinding of tungsten carbide coating thin-walled guide tube, based on told tungsten carbide coating Thin-walled guide tube outer profile carries out grinding process and controls the control measure being in grinding process, told grinding process control measure step It is rapid as follows:

2) basal plane of tungsten carbide coating thin-walled guide tube is ground；

The specific implementation of the step 4) are as follows: based on to the corase grinding told roughness requirements achieved, periodically repaired Whole white fused alumina grinding wheel B, told corase grinding are mounted on external cylindrical dresser with dressing diamond, and external cylindrical dresser is mounted on workbench On, established angle is at 10 ° or so, and dressing diamond should be omited when the apex angle of told dressing diamond 40 takes 70 °~80 ° amendments Lower than 0.5-1mm of grinding wheel center；The trim locations of dressing diamond cannot differ too big with grinding wheel position when grinding, Buddha's warrior attendant Stone finishing pen is when the lateral position of grinding wheel is located at grinding on similar position；To guarantee the contour and cutting of the micro- sword of grinding wheel Performance, and prevent workpiece when grinding from generating self-excited vibration；The finishing of told white fused alumina grinding wheel (A, B) fillet (R8, R3), wherein needing It is repaired manually with green stone, it is whether qualified with saw blade examination mill R rule school inspection white fused alumina grinding wheel fillet, then carry out knuckle R Grinding.

The specific implementation of the step 4) are as follows: it is seldom modified based on the super-hard abrasive tool (skive) told, when When the working face of skive loses geometric accuracy and blunt, appropriate finishing must be done, but trim amount is few, by half fine grinding, essence Mill, super grinding roughness requirements achieved, periodically carry out finishing skive, and the diamond grinding wheel dressing told is a kind of Cylindrical finishing device；Tell that a kind of cylindrical finishing device is made of mandrel 36, washer 12, green silicon carbide grinding wheel F, nut 13, Told 36 length of mandrel is consistent with workpiece W length, improve workpiece grinding repetitive positioning accuracy, told spindle nose 37 equipped with it is green The diameter portion and screw thread that color silicon carbide grinding wheel F inner hole matches, tighten fixation, told axis for its grinding wheel washer 12 and nut 13 After head outer diameter and skive clamping, static balance leveling need to be carried out to skive, outer diameter circle bounce required precision is not Greater than 0.015mm, told shaft end 38 is equipped with taper and fixes with the implementation tapered sleeve of collet 39, and using " Double Tops point " and " grinding wheel repairs sand Wheel " is to diamond grinding wheel dressing, to guarantee workpiece size tolerance and roughness requirements after grinding；Due to skive C, D, the finishing of E outer diameter causes not forming for original fillet, needs to do slight finishing, first refine manually with green silicon carbide grinding wheel F Whether end surface of diamond grinding wheel, then refine skive point side are closed with saw blade examination mill with R rule school inspection skive fillet Lattice, then carry out the grinding of knuckle R value.

Further, grinding wheel used in a kind of cylindrical finishing device is green silicon carbide grinding wheel F, concrete model are as follows: P100×30×20 GC60-M8V。

Installation steps are as follows:

1) measurement of planeness of ring flange 40, generally no greater than 0.01mm are needed first；

2) guarantee that the necessary straight smooth pieces of grinding wheel spindle 41 are lossless, major axis size must be in the margin of tolerance；

3) grinding wheel allows for freely being installed to main shaft 41 or flange 42(Φ 175 × 88 × 127) on；

4) it must be lined with flange paper washer 44 between 43 seal face of grinding wheel and chuck, and to expose 2mm in 40 circumferential exterior of ring flange More than；

5) for the flange of Multi-point fastening, when installation, when multiple six sides fastening bolts 45 are tightened should by diagonal sequence, in several times by Step is tightened；

Leveling step is as follows:

3) whole balance weights 46 are unloaded, insertion balance mandrel, sets and is slowly rolled after it stands on balancing stand in chuck hole, Marked " # " at grinding wheel most next point S with marking pen, this point is center of gravity (Figure 17 A), relative to S fasten first piece it is flat Weigh block 46, tightens fixation with six side's screws 47, this block no longer moves (Figure 17 B) later, simultaneously for first piece of balance weight 46, tightly Gu grinding wheel, is then placed on balancing stand again and slowly rolls by other two pieces of balance weights 46, such as still uneven, two only need to be symmetrically moved Block balance weight (Figure 17 C), until grinding wheel can stop in any position, static balance comes to an end.

A kind of method for grinding of tungsten carbide coating thin-walled guide tube, the specific implementation of the step 7) are as follows: told A kind of arch measuring tool of the detection of excircle dimension, told arch measuring tool is by toxoplasm 48, measurement matrix 49, fastening screw 10, fixed Position body 50 and amesdial 27 form, and told positioning body 50 is equipped with center positioning hole 51, by its amesdial 27 in fastening screw 10 The lower adjustable fixation of progress is tightened, tells that measurement matrix 49 realizes not similar shape with the contact of workpiece W for point or face, arch measuring tool The measurement of shape, different scale workpiece outer diameter also achieves the measurement of form tolerance (circularity and cylindricity), and told arch measuring tool is just It is to be combined into dimensional tolerance length with to table part 29 or gauge block, it is whether qualified using method of comparison measurement outer circle；Told knuckle The inspection amount of dimensional tolerances is advised with a kind of R, and told R rule are exactly to go to compare with the outer radius on ruler, is using light gap method measurement circular arc No qualification；A kind of universal protractor of the inspection amount of the dimensional tolerances for the end chamfer told, told universal protractor is exactly to use angle Whether ruler and base ruler on degree ruler adjust qualified angle in contrast on main scale, closed using light gap method measurement end chamfer Lattice；A kind of amesdial of the inspection amount of the line position tolerance of told end face, told amesdial 27 are set in the folder hole of magnetic force dial framework 28, work Dial framework seat 52 can be horizontally or vertically adsorbed on grinding machine when making, and carried out the detection of geometric tolerance (circle bounce), surveyed using amesdial Whether qualified measure end face run-out.

The above is only preferred implementation method of the invention, it is noted that for the those of ordinary skill of technical field For, without departing from the principle of the present invention, several modifications, modification and retouching can also be made, these modifications, modification and Retouching also should be regarded as protection scope of the present invention.

Claims

1. a kind of method for grinding of tungsten carbide coating thin-walled guide tube fixture, it is characterised in that: be based on passing through step pair as described below Fixture is ground, and is controlled grinding movement and crushing movement, is ground, is mentioned to fixture by operating grinding machine The high positioning accuracy of workpiece；

It is described that specific step is as follows:

3) with two planes of surface grinding machine fine grinding end cap (33)；

Its clamping method is as follows: using the centre bore (3) of jig main body one end as positioning datum, jig main body (1) being used bullet Spring force is supported on top (6) and is tightened with washer (12) fixture nut (13), pull rod (8) pass through driver plate (9) location hole by its It is fixed on grinding machine head stock frame (14), realizes driver plate (9) axial restraint, tighten the circumferential direction that fastening screw (10) realize driver plate (9) It is fixed；And its right end is supported with centre frame (7), since centre bore and jig main body outer circle have very high position precision, and it is top What the radial circular run-out error that not can rotate in jig main body one end, therefore can eliminate grinding machine head stock frame spindle end processed jig main body It influences；Centre bore grinding is carried out on grinding machine, and (grinding wheel is contacted with centre bore at line, and jig main body rotates on centre frame, grinding Speed is 25m/s, can correct centre bore coaxiality error), therefore the positioning accuracy of centre bore when excircle of workpiece is ground can be improved；

The specific implementation of the step 2 is inclined by grinding adjustment Grinder bench (15) to jig main body outer diameter (4) Swinging aligns the cylindricity of jig main body, by grinding to jig main body shoulder end face (5) adjustment grinding machine head stock frame (14) with Tailstock (16) line of centres aligns the flatness of jig main body, carries out standard to the grinding of told tungsten carbide coating thin-walled guide tube (W) It is standby；

Further, told centre bore (3) grinding uses white fused alumina grinding wheel (A) concrete model are as follows: B50 × 40 × 20 WA46- K8V；

Further, told jig main body outer diameter (4) and shoulder end face (5) grinding use white fused alumina grinding wheel (B) concrete model are as follows: P400×40×127 WA120-H8V；

Further, the told white fused alumina grinding wheel end face (B) finishing, it is ensured that the end face of grinding wheel and outer diameter are between 80 °~90 ° Finishing, grinding wheel point side durability are high.

2. a kind of method for grinding of tungsten carbide coating thin-walled guide tube, it is characterised in that: based on being led to the tungsten carbide coating thin-walled The grinding technique of cylinder outer profile (outer circle, knuckle, end face, end chamfer) requires to determine grinding technique parameter, and right Tungsten carbide coating thin-walled guide tube outer profile carries out grinding process control, it may be assumed that corase grinding working process parameter, half ground finish technique ginseng Number, ground finish technique parameter, super grinding working process parameter；

Workpiece rotational frequency: 150r/min；

Grinding speed: 35m/s；

Feeding speed: 0.4m/min；

Longitudinal finishing feed speed: 50mm/min；

Modify bite: 0.06mm；

The finishing number of strokes: 2；

Light repairs number: 0；

Tarry matter number: 1；

Workpiece surface roughness (Ra) before grinding: 1.6 μm；

Tell that half ground finish technique parameter is as follows:

Workpiece rotational frequency: 150r/min；

Grinding speed: 35m/s；

Feeding speed: 0.3m/min；

Headstock spindle revolving speed when finishing: 90r/min；

Longitudinal finishing feed speed: 25mm/min；

Modify bite: 0.02mm；

The finishing number of strokes: 2；

Light repairs number: 1；

Tarry matter number: 2；

Workpiece surface roughness (Ra) before grinding: 0.4 μm；

Told ground finish technique parameter is as follows:

Workpiece rotational frequency: 100r/min；

Grinding speed: 17.5m/s；

Feeding speed: 0.2m/min；

Headstock spindle revolving speed when finishing: 50r/min；

Longitudinal finishing feed speed: 20mm/min；

Modify bite: 0.01mm；

The finishing number of strokes: 3；

Light repairs number: 1；

Tarry matter number: 4；

Workpiece surface roughness (Ra) before grinding: 0.2 μm；

The super grinding working process parameter told is as follows:

Workpiece rotational frequency: 100r/min；

Grinding speed: 17.5m/s；

Feeding speed: 0.1m/min；

Headstock spindle revolving speed when finishing: 30r/min；

Longitudinal finishing feed speed: 10mm/min；

Modify bite: 0.005mm；

The finishing number of strokes: 3；

Light repairs number: 1；

Tarry matter number: 6；

Workpiece surface roughness (Ra) before grinding: 0.1 μm；

Workpiece rotational frequency: 40~80r/min；

Inner circle grinding wheel speed: 10000~15000r/min；

Headstock spindle revolving speed when finishing: 30~40r/min；

Modify bite: 0.005~0.01mm；

The finishing number of strokes: 3；

Light repairs number: 1；

Tarry matter: to no-spark；

Workpiece surface roughness (Ra) before grinding: 0.4 μm；

4) it is ground: grinding machine head stock frame (14), tailstock (16) will be loaded on equipped with the jig main body (1) of tungsten carbide coating thin-walled guide tube (W) Top (6) on, its told tungsten carbide coating thin-walled guide tube outer circle (17), knuckle (18) are roughly ground respectively；

Fixture is removed from grinding machine after mill, lies against ground, machine oil is uniformly smeared in the outer circle of workpiece (after casting paraffin easily Remove), the later half fine ginding processing of paraffin to be cast；

10) change wax: being drenched after measurement with boiled water and scald excircle of workpiece, there is the variation expanded with heat and contract with cold by workpiece and jig main body, leaching is scalded Excircle of workpiece pins workpiece with hand and carries out circular motion, gently above mention and drawing off can melt the paraffin that workpiece inner wall is adhered to Workpiece；

3) the specific implementation are as follows: based on told ground finish technique parameter to told tungsten carbide coating thin-walled guide tube outside Circle (17), knuckle (18), end face (19), end chamfer (20) refined the following steps are included:

5) it measures: measuring excircle of workpiece scale with arch measuring tool, advise measurement knuckle R value with R, jumped with amesdial measurement end face It is dynamic, end chamfer size is measured with universal protractor；

Further, based on extra tungsten carbide tumor is stained on angle faces, this angle faces is ground using inner circle grinding tool (35), is told interior Circle grinding tool skive (E) concrete model are as follows: 50 × 25 × 13 × 6 RVD of 6A2,80/100 B50, with amesdial (27) The bounce of centering skive (E) outer circle is not more than 0.005mm, carries out leveling installation, pays attention to the installation direction and workpiece of angle End chamfer is consistent.

3. a kind of tungsten carbide coating thin-walled guide tube method for grinding according to claim 2, it is characterised in that: 4) specific Implementation are as follows: based on corase grinding parameter (processing capacity 0.15mm) is told, Roundness of Workpiece is a kind of control of 0.015~0.03mm after mill Ovalizing deflection method processed implements specific steps are as follows:

4. a kind of method for grinding of tungsten carbide coating thin-walled guide tube according to claim 2, it is characterised in that: based on being told Tungsten carbide coating thin-walled guide tube outer profile carries out grinding process and controls the control measure being in grinding process, told grinding process Steps are as follows for control measure:

2) basal plane of tungsten carbide coating thin-walled guide tube is ground；

The specific implementation of the step 4) are as follows: based on to the corase grinding told roughness requirements achieved, periodically repaired Whole white fused alumina grinding wheel (B), told corase grinding are mounted on external cylindrical dresser with dressing diamond, and external cylindrical dresser is mounted on work On platform, established angle is at 10 ° or so, the dressing diamond when apex angle of told dressing diamond (58) takes 70 °~80 ° amendments 0.5-1mm of grinding wheel center should be slightly below；The trim locations of dressing diamond cannot differ too big with grinding wheel position when grinding, Dressing diamond is when the lateral position of grinding wheel is located at grinding on similar position；With guarantee the micro- sword of grinding wheel contour and Cutting ability, and prevent workpiece when grinding from generating self-excited vibration；The finishing of told white fused alumina grinding wheel (A, B) fillet (R8, R3), In need to be repaired manually with green stone, it is whether qualified with saw blade examination mill R rule school inspection white fused alumina grinding wheel fillet, then carry out transition circle Angle R grinding；

The specific implementation of the step 4) are as follows: seldom modified based on the super-hard abrasive tool (skive) told, work as Buddha's warrior attendant When the working face of stone sand wheel loses geometric accuracy and blunt, appropriate finishing must be done, but trim amount is few, by half fine grinding, fine grinding, surpassed Roughness requirements achieved are refined, finishing skive is periodically carried out, a kind of outer circle of the diamond grinding wheel dressing told Trimming device；Tell a kind of cylindrical finishing device by mandrel (36), washer (12), green silicon carbide grinding wheel (F), nut (13) group At told mandrel (36) length is consistent with workpiece (W) length, improves the repetitive positioning accuracy of workpiece grinding, told spindle nose (37) it is equipped with the diameter portion to match with green silicon carbide grinding wheel (F) inner hole and screw thread, by its grinding wheel washer (12) and nut (13) fixation is tightened, told spindle nose outer diameter need to carry out static balance leveling to skive with after skive clamping, outside Diameter circle bounce required precision is not more than 0.015mm, and told shaft end (38) is equipped with taper and fixes with collet (39) implementation tapered sleeve, adopts With " Double Tops point " and " grinding wheel repairs grinding wheel " to diamond grinding wheel dressing, to guarantee workpiece size tolerance and roughness after grinding It is required that；Due to the finishing of skive (C, D, E) outer diameter, not forming for original fillet is caused, is needed with green silicon carbide sand Wheel (F) does slight finishing, first refine end surface of diamond grinding wheel, then refine skive point side manually, advises with saw blade examination mill with R Whether skive fillet is examined in school qualified, then carries out the grinding of knuckle R value；

Further, grinding wheel used in a kind of cylindrical finishing device is green silicon carbide grinding wheel (F), concrete model are as follows: P100×30×20 GC60-M8V。

5. wanting a kind of 4 method for grinding of tungsten carbide coating thin-walled guide tube according to right, it is characterised in that: the step 5) Specific implementation are as follows: based on told skive than plain wheel (such as white fused alumina grinding wheel) when for the first time using leveling Leveling is more once to look for symmetrically, it is desirable that the required precision for paying attention to grinding wheel installation, because grinding force slightly unevenly will result in ruler Very little tolerance is inaccurate, roughness is high and damage coating；With fastening diamond after amesdial centering skive outer diameter symmetric points Grinding wheel, it is therefore intended that the oval correction amount of skive reaches minimum, unloads skive later and carries out plain wheel peace Adjustment is flat；

Installation steps are as follows:

Leveling step is as follows:

6. wanting a kind of 4 method for grinding of tungsten carbide coating thin-walled guide tube according to right, it is characterised in that: the step 6) Specific implementation are as follows: select told high-speed dedicated grinding fluid, model RM-003, it is dissolved in water, dilution ratio are as follows: Cutting fluid 3%~5%, clean water 97%~95%.

7. wanting a kind of 4 method for grinding of tungsten carbide coating thin-walled guide tube according to right, it is characterised in that: the step 7) Specific implementation are as follows: a kind of arch measuring tool of the detection of told excircle dimension, told arch measuring tool is by toxoplasm (48), measurement Matrix (49), fastening screw (10), positioning body (50) and amesdial (27) composition, told positioning body (50) are equipped with center positioning hole (51), its amesdial (27) is subjected under the tightening of fastening screw (10) adjustable fixation, tells measurement matrix (49) and work The contact of part (W) is that point or face, arch measuring tool realize the measurement of different shape, different scale workpiece outer diameter, also achieves shape The measurement of shape tolerance (circularity and cylindricity), told arch measuring tool are exactly long with dimensional tolerance is combined into table part (29) or gauge block Whether degree is qualified using method of comparison measurement outer circle；The inspection amount of the dimensional tolerances of told knuckle is advised with a kind of R, and told R rule are just It is to go to compare with the outer radius on ruler, it is whether qualified using light gap method measurement circular arc；The dimensional tolerances for the end chamfer told A kind of universal protractor of inspection amount, told universal protractor be exactly on bevel protractor ruler and base ruler qualification is adjusted on main scale Whether angle is in contrast, qualified using light gap method measurement end chamfer；The inspection amount of the line position tolerance of told end face one kind thousand Point table, told amesdial (27) is in the folder hole of magnetic force dial framework (28), and dial framework seat (52) can be adsorbed horizontally or vertically when work On grinding machine, the detection of geometric tolerance (circle bounce) is carried out, it is whether qualified using amesdial measurement end face run-out.

8. wanting a kind of 4 method for grinding of tungsten carbide coating thin-walled guide tube according to right, it is characterised in that: the step 8) Specific implementation are as follows: tungsten carbide coating thin-walled guide tube roughness (Ra) after refining is 0.06~0.2 μm；End face circle is jumped It moves as 0.0015~0.0022mm, flatness 0.003mm；Tungsten carbide coating thin-walled guide tube circularity after super grinding is 0.003mm, cylindricity 0.005mm, outer circle are 0.005mm to the verticality of end face.

9. a kind of method for grinding of tungsten carbide coating thin-walled guide tube according to claim 1, it is characterised in that: told grinding machine packet It includes:

Told tailstock (16): tailstock centre (6-2) is Mohs 4#；

Told cooling system: cooling pump model AYB-25GC, flow 25L/min；