CN102909612B - Method for grinding self-centering drill bit - Google Patents
Method for grinding self-centering drill bit Download PDFInfo
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- CN102909612B CN102909612B CN201110216178.6A CN201110216178A CN102909612B CN 102909612 B CN102909612 B CN 102909612B CN 201110216178 A CN201110216178 A CN 201110216178A CN 102909612 B CN102909612 B CN 102909612B
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- reconditioning
- point
- knife
- drill bit
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910001651 emery Inorganic materials 0.000 claims description 44
- 238000010009 beating Methods 0.000 claims description 4
- 230000036461 convulsion Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 abstract description 8
- 238000012423 maintenance Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention belongs to the technical field of grinding for cutting edges of drill bits, and particularly relates to a method for grinding a self-centering drill bit. The self-centering drill bit is ground by a grinding wheel after being fixed. The method particularly includes steps of adjusting angles among various ground surfaces of the self-centering drill bit and the grinding wheel with a sharp corner; and sequentially grinding a first rear knife face of a knife point, a first rear knife face of a drill point, a second rear knife face of the knife point and a second rear knife face of the drill point of the self-centering drill bit. The method has the advantages that the drill bit is ground by existing common grinding equipment, the practicality is high, and the usage cost is lowered.
Description
Technical field
The invention belongs to the technical field of the cutting edge of drill bit being carried out to sharpening, relate in particular to a kind of method of reconditioning self-centering drill bit.
Background technology
Drill bit point can be divided into two kinds of straight trough and helicla flutes by grooved, comes point can be divided into right-handed screw angle and backpitch angle by helical angle direction, and helical angle can vary according to actual needs.Point there are carbide alloy, high-speed steel, weld PCD drill bit in addition from cutter material.Handle of a knife has two kinds of staight shank and taper shanks.Present drill bit major part is all straight shank carbide drill head, because present handle of a knife is all hydraulic pressure, the heat in addition solid fixed form of side that rises.Only have little special plane using taper-shank drill.Also abandon according to the drift angle of drill bit the traditional idea that drill head apical angle 118 is spent in the past, starting to have more drill head apical angle to have 130 degree, 135 degree, 140 degree, 150 to spend difference as requested can have more angle of drill bit to exist.There are common apex point and the said self-centering apex point of this programme by the form of apex point, also have a kind of special thin-walled apex point.Mostly adopt common apex point and self-centering apex point in the present high-speed cutting epoch, common apex point uses the most extensive.Because self-centering drill bit reconditioning is difficult in maintenance, also very difficult even if numerically control grinder is programmed sometimes, can not be unified as the batch production of cutter producer.So common apex point is widely used, but in order to locate accurately rapidly raising productive temp, still a lot of companies realize quick and precisely location with this self-centering drill bit and realize high number cutting.
Be showing improvement or progress day by day along with manufacturing, the precision to workpiece and working (machining) efficiency require more and more higher.Self-centering apex point replaces common apex point just gradually.Enhance productivity location fast thereby realize high-speed cutting, but this type of reconditioning maintenance is very difficult.Because this type of drill bit apex point is made up of two parts, the one, the apex point of location fast, the 2nd, the point of a knife of high-speed cutting.Utilize conventional equipment in the time of reconditioning, because common polishing device is only to complete common rectilinear motion, can not realizes as numerically control grinder and programme away and differ from the function of mending, when reconditioning apex point, point of a knife is interfered, and when reconditioning point of a knife, apex point is interfered.Use high accuracy five travelling wheelhead roll grinders to require high especially to programming personnel's technical ability.Reconditioning to cutter and recycling bring great inconvenience.Cause the cost of charp tool high, because of cannot self-healing after tool wear, need appoint other unit or return factory and carry out reconditioning, expense be generally new cutter 30% or more.The reconditioning expense that needs to pay great number, causes enterprise's cost of charp tool high; Because the cutter grinding cycle is long, the volume of the circular flow that need to increase cutter just can not affect normal use, causes the occupation of capital to enterprise, brings loss economically to enterprise simultaneously.
Summary of the invention
For solving the deficiencies in the prior art, the invention provides a kind of method of reconditioning self-centering drill bit, it has realized the grinding to drill bit by existing common polishing device, and practicality is high, has reduced use cost.
For achieving the above object, the method of reconditioning self-centering drill bit of the present invention, after pilot bit is fixing, adopt sharper bowl type or dish (emery) wheel to carry out reconditioning to pilot bit, the method is by the angle between each reconditioning face and the angular emery wheel of tool of adjustment pilot bit, and the point of a knife major first flank to pilot bit, apex point major first flank, the rear knife face of point of a knife second, the rear knife face of apex point second carry out grinding in turn.
As the restriction to aforesaid way, described emery wheel is bowl abrasive wheel or dish (emery) wheel.
Specifically, the method for reconditioning self-centering drill bit of the present invention comprises the steps:
Step 1, fixing of self-centering drill bit, on cutter clamping axle, makes the center line of pilot bit parallel with the axis of cutter clamping axle pilot bit clamping;
Step 2, the reconditioning of point of a knife major first flank, adjusts emery wheel angle, and emery wheel is upwarped, and the relative point of a knife major first flank of emery wheel forms the first relief angle of 7 ~ 10 degree; Feeding reconditioning pilot bit, by emery wheel by the major first flank reconditioning of pilot bit to point of a knife place, one of them point of a knife major first flank reconditioning is put in place; By after self-centering drill bit Rotate 180 degree, to another point of a knife major first flank reconditioning position;
Step 3, the reconditioning of apex point major first flank, adjusts cutter clamping axle, makes to have between itself and emery wheel wedge angle place end face the angle of apex point half, by emery wheel, the reconditioning of apex point major first flank is arrived to point of a knife major first flank place, to apex point, one of them major first flank reconditioning puts in place; By after self-centering drill bit Rotate 180 degree, to apex point, another major first flank reconditioning puts in place;
Step 4, the rear knife face reconditioning of point of a knife second, based on step 3, by lifting 10 ~ 15 degree on cutter clamping axle, taking land as benchmark, grind length by controlling the rear knife face of point of a knife second, by emery wheel by the second rear knife face reconditioning to point of a knife place, to one of them point of a knife second, rear knife face reconditioning puts in place; By after self-centering drill bit Rotate 180 degree, to another point of a knife second, rear knife face reconditioning puts in place;
Step 5, the rear knife face reconditioning of apex point second, adjust cutter clamping axle, make to have between itself and emery wheel wedge angle place end face the angle of apex point half, by controlling amount of grinding to form apex point major first flank width, use emery wheel that rear apex point second knife face reconditioning is arrived to the rear knife face of point of a knife second place, to apex point, one of them second rear knife face reconditioning puts in place; By after self-centering drill bit Rotate 180 degree, to apex point, another second rear knife face reconditioning puts in place.
Further, step 6, opens chisel edge, grinds by emery wheel the chisel edge that width is 0.2mm-0.3mm.
As the restriction to aforesaid way, after above steps puts in place to the each rear knife face reconditioning of self-centering drill bit, all process an equal amount of grinding.
As the further restriction to aforesaid way, above-mentioned amount of grinding is 0.2mm.
As the improvement to aforesaid way, above-mentioned self-centering drill bit is fixed on cutter clamping axle by spring chuck.
As the restriction to aforesaid way, before step 1, comprise the inspection step of beating, self-centering drill bit is clipped while being arranged on cutter clamping axle with spring clip cover, the axis jerk value of the relative cutter clamping axle of cutter is checked.
As the further restriction to aforesaid way, described cutter jerk value is 0.02mm.
Adopt technique scheme, utilize the feature of bowl abrasive wheel or dish (emery) wheel wedge angle, by being carried out to branch, grinds in turn the each rear knife face of self-centering drill bit, realize good grinding effect, solve the prosthetic appliance of self-centering drill bit has been dropped into, make can again utilize after self-centering drill bit reconditioning, require lower to equipment and personnel.
Brief description of the drawings
Below in conjunction with the drawings and the specific embodiments, the present invention is done further to describe in detail:
Fig. 1 is the overall structure schematic diagram of the self-centering drill bit that the present invention relates to;
Fig. 2 is the right view of Fig. 1.
In figure:
1, apex point; 11, apex point major first flank; 12, the rear knife face of apex point second; 2, point of a knife; 21, point of a knife major first flank; 22, the rear knife face of point of a knife second.
Detailed description of the invention
Taking existing typical carbide straight trough self-centering drill bit as example, method of the present invention is described in detail as follows below:
Known as shown in Figure 1, the cutting tip of this self-centering drill bit is mainly made up of apex point 1 and point of a knife 2 two parts, and as seen from Figure 2, this self-centering drill bit has the combining structure of apex point 1 and point of a knife 2.Wherein, apex point 1 apex point major first flank 11 and the rear knife face 12 of apex point second, point of a knife 2 point of a knife major first flanks 21 and the rear knife face of point of a knife second.
In the time that above-mentioned self-centering drill bit is repaired, the general thought of its reparation is that drill bit is decomposed, by the angle between each reconditioning face and the angular emery wheel of tool of adjustment pilot bit, the point of a knife major first flank 21 to pilot bit, apex point major first flank 11, the rear knife face 22 of point of a knife second, the rear knife face 12 of apex point second carry out grinding in turn.Emery wheel adopts bowl abrasive wheel (11V9) or dish (emery) wheel (12V9).
Its concrete method of grinding comprises the steps:
Step 1, after being clipped with spring housing, pilot bit is arranged on the equipment with cutter clamping axle, adopt beating of magnetic power meter or the installation of centimeter check drill bit, specifically magnetic stand is adsorbed on to the height that detects two points of a knife on equipment, gauge outfit is contacted to point of a knife and write down dial gauge reading, then cutter Rotate 180 degree is measured the height of another point of a knife, too greatly illustrate that if differ cutter clamping has problem to need to adjust, ensure beating at 0.02mm of cutter, so that the dead in line of the center line of pilot bit and cutter clamping axle;
Step 2,21 reconditionings of point of a knife major first flank, are adjusted to level by the clamping axle that cutter is housed, and vertical with center line of bit to guarantee the drill bit main cutting edge of reconditioning, now, emery wheel is parallel with cutter.Adjust emery wheel angle, make grinding wheel spindle upwards lift 7 ~ 10 degree, make the relative point of a knife major first flank of emery wheel form the first relief angle of 7 ~ 10 degree, will use grinding wheel diameter maximum here, to ensure the quality of reconditioning apex point as far as possible.By hand feed pilot bit, make the point of a knife major first flank 21 of pilot bit contact beginning reconditioning with emery wheel, the each amount of feeding of pilot bit is that 0.01mm is advisable, by emery wheel by point of a knife major first flank 21 reconditionings of pilot bit to point of a knife place, one of them point of a knife major first flank reconditioning is put in place, and then the amount of grinding of about feeding reconditioning 0.2mm, reconditioning this position under postscript that puts in place; By after self-centering drill bit Rotate 180 degree, after another point of a knife major first flank 21 reconditionings are put in place, the amount of grinding about feeding reconditioning 0.2mm equally, with good by wearing part reconditioning;
Step 3,11 reconditionings of apex point major first flank, taking the angle of apex point part as 120 degree are as example, adjust cutter clamping axle, make the monolateral formation 60 of nose part of cutter clamping axle and emery wheel spend angle, while apex point major first flank being repaired a die to point of a knife major first flank place by emery wheel, stop emery wheel feeding, then reconditioning another side, repeatedly grinds relief cutter and marches forward about 0.2mm; By after self-centering drill bit Rotate 180 degree, after another major first flank reconditioning of apex point, allow cutter march forward about 0.2mm, to realize the slitless connection of apex point major first flank 11 and point of a knife major first flank 21;
Step 4, rear knife face 22 reconditionings of point of a knife second, this step medium plain emery wheel and equipment state and step 2 are basic identical, just based on step 3, will on cutter clamping axle, lift 10 ~ 15 degree, feeding reconditioning gradually.Method and reconditioning point of a knife major first flank are basic identical, just to control reconditioning quality, to control the width of major first flank, the width of general major first flank is in 0.3 ~ 0.5mm left and right, owing to being difficult for dismantling measurement, so this width can be taking the land of cutter as benchmark, width is the same with margin width just can make the length of the second rear knife face and major first flank length consistent, grind length by controlling the rear knife face of point of a knife second, by emery wheel by the second rear knife face reconditioning to point of a knife place, to one of them point of a knife second, rear knife face reconditioning puts in place, then the amount of grinding of feeding reconditioning 0.2mm left and right, by after self-centering drill bit Rotate 180 degree, to another point of a knife second, rear knife face reconditioning puts in place, then the amount of grinding of feeding reconditioning 0.2mm left and right,
Step 5, rear knife face 12 reconditionings of apex point second, this step and step 3 are basic identical, and difference is based on step 4, adjusts cutter clamping axle, makes to form 60 degree angles between itself and emery wheel wedge angle place end face.
Step 6, opens chisel edge, grinds by emery wheel the chisel edge that width is 0.2mm-0.3mm.
Claims (8)
1. the method for a reconditioning self-centering drill bit, after pilot bit is fixing, adopt emery wheel to carry out reconditioning to pilot bit, it is characterized in that: the method is by the angle between each reconditioning face and the angular emery wheel of tool of adjustment pilot bit, and the point of a knife major first flank to pilot bit, apex point major first flank, the rear knife face of point of a knife second, the rear knife face of apex point second carry out grinding in turn;
The method comprises the steps:
Step 1, fixing of self-centering drill bit, on cutter clamping axle, makes the center line of pilot bit parallel with the axis of cutter clamping axle pilot bit clamping;
Step 2, the reconditioning of point of a knife major first flank; Adjust emery wheel angle, emery wheel is upwarped, and the relative point of a knife major first flank of emery wheel forms the first relief angle of 7 ~ 10 degree, feeding reconditioning pilot bit, by emery wheel by the major first flank reconditioning of pilot bit point of a knife to point of a knife place, one of them point of a knife major first flank reconditioning is put in place; By after self-centering drill bit Rotate 180 degree, another point of a knife major first flank reconditioning is put in place;
Step 3, the reconditioning of apex point major first flank, adjusts cutter clamping axle, makes to have between itself and emery wheel wedge angle place end face the angle of apex point half, by emery wheel, the reconditioning of apex point major first flank is arrived to point of a knife major first flank place, to apex point, one of them major first flank reconditioning puts in place; By after self-centering drill bit Rotate 180 degree, to apex point, another major first flank reconditioning puts in place;
Step 4, the rear knife face reconditioning of point of a knife second, based on step 3, by lifting 10 ~ 15 degree on cutter clamping axle, taking land as benchmark, grind length by controlling the rear knife face of point of a knife second, by emery wheel by the second rear knife face reconditioning to point of a knife place, to one of them point of a knife second, rear knife face reconditioning puts in place; By after self-centering drill bit Rotate 180 degree, to another point of a knife second, rear knife face reconditioning puts in place;
Step 5, the rear knife face reconditioning of apex point second, adjust cutter clamping axle, make to have between itself and emery wheel wedge angle place end face the angle of apex point half, by controlling amount of grinding to form apex point major first flank width, use emery wheel that rear apex point second knife face reconditioning is arrived to the rear knife face of point of a knife second place, to apex point, one of them second rear knife face reconditioning puts in place; By after self-centering drill bit Rotate 180 degree, to apex point, another second rear knife face reconditioning puts in place.
2. the method for reconditioning self-centering drill bit according to claim 1, is characterized in that: described emery wheel is bowl abrasive wheel or dish (emery) wheel.
3. the method for reconditioning self-centering drill bit according to claim 1, is characterized in that:
Step 6, opens chisel edge, grinds by emery wheel the chisel edge that width is 0.2mm-0.3mm.
4. the method for reconditioning self-centering drill bit according to claim 1, is characterized in that: after the each rear knife face reconditioning of self-centering drill bit is put in place, all process an equal amount of grinding.
5. the method for reconditioning self-centering drill bit according to claim 4, is characterized in that: described amount of grinding is 0.2mm.
6. the method for reconditioning self-centering drill bit according to claim 1, is characterized in that: described self-centering drill bit is fixed on cutter clamping axle by spring chuck.
7. the method for reconditioning self-centering drill bit according to claim 6, it is characterized in that: before step 1, comprise the inspection step of beating, self-centering drill bit is clipped while being arranged on cutter clamping axle with spring clip cover, the axis jerk value of the relative cutter clamping axle of cutter is checked.
8. the method for reconditioning self-centering drill bit according to claim 7, is characterized in that: described cutter jerk value is 0.02mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110216178.6A CN102909612B (en) | 2011-07-31 | 2011-07-31 | Method for grinding self-centering drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110216178.6A CN102909612B (en) | 2011-07-31 | 2011-07-31 | Method for grinding self-centering drill bit |
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| Publication Number | Publication Date |
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| CN102909612A CN102909612A (en) | 2013-02-06 |
| CN102909612B true CN102909612B (en) | 2014-12-03 |
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| CN201110216178.6A Expired - Fee Related CN102909612B (en) | 2011-07-31 | 2011-07-31 | Method for grinding self-centering drill bit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104227093B (en) * | 2014-09-12 | 2017-01-25 | 广西玉林达业机械配件有限公司 | Drill point centering countersinking cutter |
| JP7082750B2 (en) * | 2018-03-22 | 2022-06-09 | 株式会社不二越 | Drill |
| CN112643414A (en) * | 2020-12-09 | 2021-04-13 | 航天科工哈尔滨风华有限公司 | Method for processing and manufacturing hard alloy drill bit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB932422A (en) * | 1958-12-11 | 1963-07-24 | Birmingham Small Arms Co Ltd | Improvements in or relating to the pointing of drills |
| CN2158766Y (en) * | 1992-10-31 | 1994-03-16 | 西南石油学院 | Hand-driven cutter grinding device for group drills |
| CN1295903A (en) * | 2000-12-08 | 2001-05-23 | 王存厚 | Other axle helicoidal surface grinding method and edge-grinding machine for cutting edge of twist drill |
| CN101053940A (en) * | 2007-04-17 | 2007-10-17 | 湖南大学 | Sharpening method for drill tip back knife face of fully screw face drill |
| CN101081483A (en) * | 2007-04-17 | 2007-12-05 | 湖南大学 | Full helicoidal surface Micro-drill web thinning method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5577453A (en) * | 1978-11-29 | 1980-06-11 | Seiichi Tsunoda | Drill grinding machine |
-
2011
- 2011-07-31 CN CN201110216178.6A patent/CN102909612B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB932422A (en) * | 1958-12-11 | 1963-07-24 | Birmingham Small Arms Co Ltd | Improvements in or relating to the pointing of drills |
| CN2158766Y (en) * | 1992-10-31 | 1994-03-16 | 西南石油学院 | Hand-driven cutter grinding device for group drills |
| CN1295903A (en) * | 2000-12-08 | 2001-05-23 | 王存厚 | Other axle helicoidal surface grinding method and edge-grinding machine for cutting edge of twist drill |
| CN101053940A (en) * | 2007-04-17 | 2007-10-17 | 湖南大学 | Sharpening method for drill tip back knife face of fully screw face drill |
| CN101081483A (en) * | 2007-04-17 | 2007-12-05 | 湖南大学 | Full helicoidal surface Micro-drill web thinning method |
Non-Patent Citations (2)
| Title |
|---|
| 吕彦明等.复杂螺旋面钻尖刃磨原理及实现.《中国机械工程》.2000,第11卷(第3期),全文. * |
| 复杂螺旋面钻尖刃磨原理及实现;吕彦明等;《中国机械工程》;20000330;第11卷(第3期);全文 * |
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Effective date of registration: 20201224 Address after: No.99 Hangzhou Road, Rizhao Economic and Technological Development Zone, Rizhao City, Shandong Province Patentee after: Rizhao Weiyi Automobile Co.,Ltd. Address before: 071000 No. 2266 Chaoyang South Street, Hebei, Baoding Patentee before: Great Wall Motor Co.,Ltd. |
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Address after: No.99 Hangzhou Road, Rizhao Economic and Technological Development Zone, Rizhao City, Shandong Province Patentee after: Rizhao WeiPai Automobile Co.,Ltd. Address before: No.99 Hangzhou Road, Rizhao Economic and Technological Development Zone, Rizhao City, Shandong Province Patentee before: Rizhao Weiyi Automobile Co.,Ltd. |
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