CN1528542A - Method and apparatus for manufacturing reducing pipe - Google Patents
Method and apparatus for manufacturing reducing pipe Download PDFInfo
- Publication number
- CN1528542A CN1528542A CNA2003101118267A CN200310111826A CN1528542A CN 1528542 A CN1528542 A CN 1528542A CN A2003101118267 A CNA2003101118267 A CN A2003101118267A CN 200310111826 A CN200310111826 A CN 200310111826A CN 1528542 A CN1528542 A CN 1528542A
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- pipe
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- mould
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 230000008569 process Effects 0.000 claims abstract description 31
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000010949 copper Substances 0.000 claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 5
- 238000005242 forging Methods 0.000 claims abstract description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 30
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 9
- 238000005057 refrigeration Methods 0.000 description 7
- 230000007704 transition Effects 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- 238000003801 milling Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 208000033999 Device damage Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000035611 feeding Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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Abstract
The invention relates variable aperture tube making method and device, including tube end rotary forging and draw stretching. It first forges one end of the tube on the rotary forger into a smaller-aperture technical tube, which makes the stretching mould through to be clamped by the clamping module; using a hydraulic control system to drive clamping base and clamping module; inserting core rod with mould head in the copper tube to stretch by the stretching mould. It includes rotary forger and draw-stretching device. The clamping module, the stretching mould and the core rod makes up a stretching process line. The position of the core rod is adjustable and the stretching effect is good. The hydraulic control system is installed with travel switch to control stretching travel. It is applied to the control of thin-wall small-aperture copper tube and widely applied to cryogen pipeline in refrigerating industry.
Description
Technical field
The present invention relates to a kind of manufacturing method and apparatus of reducer pipe, the method and apparatus that particularly a kind of stretching that is used as the reducer pipe of refrigeration industry refrigerant pipeline is made.
Background technology
At refrigeration industries such as air-conditioner, refrigerators, use a kind of copper tube to thread a pipe in a large number as cryogen flow.Because technologic needs as throttling step-down and regulating flow etc., often will link capillary and transition conduit, two sections copper pipes that perhaps caliber varied in size couple together, and become the reducer pipe as conical pipe or laddertron, or multistage laddertron.The existing reducer pipe that is used in refrigeration industry adopts the method for welding to make basically.As everyone knows, copper the metal solder particularly thin and little copper pipe in aperture of wall has seam welding, its effect be difficult to gratifying, and very big to the influence on system operation of refrigeration plant.No matter be to technological operation and effect thereof, what of control point yield rate, operation quantity, face shaping cost height, detect: stability, environmental-protecting performance etc., inequality strong man's meaning.For example, leak the sand holes that the form leakage of weldering institute, the formed overlap of butt welding, weld seam is dark-coloured color variations, production tube bar or can be smooth inadequately vertical, and the crator of irregularity and carbon black can't be removed, pickling process is to the pollution of environment with to injury of human body etc., all these concerning welding forming technology, can't overcome at all.This has just produced the demand to reducer pipe smooth surface, continuous transition, once-forming technology.
Existing cooling reducer pipe once-forming technology has oblique milling reducer pipe technology.Chinese patent ZL98219572.9 discloses a kind of " oblique milling reducer pipe equipment ".It utilizes existing section bar oblique milling technology, and roll axis and rolling centerline are angled, is made up of two parts such as roll part and roll feedings; Make roll under the active force of feed system, move radially, by applying the pressure of constant follow procedure change to roll, thereby roll out required conical pipe or laddertron.This processing technology is transplanted from aluminium, steel profile process technology and is come, for having certain flexible copper tube, and not exclusively suitable, rolling thus reducer pipe, be difficult to guarantee to obtain thin-walled and uniform and smooth capillary; And, when making the multi-stage reducing pipe, be difficult to each level length is accurately located.
Summary of the invention
The objective of the invention is to avoid above-mentioned weak point of the prior art, need not weld and provide a kind of, manufacturing is used for the refrigeration industry pipe fitting, and its surfaces externally and internally is smooth, inside/outside diameter size is accurate, continuous transition is seamless, the method and apparatus of one or many stretching reducer pipe.
Purpose of the present invention can reach by following measure:
A kind of manufacture method of reducer pipe adopts mechanical traction that the copper pipe pipe is stretched, and it is characterized in that, this traction drawing process comprises that pipe end swages and draw the stretching two procedures:
(1) the pipe end operation of swaging: insert a module in the end pipe of copper pipe pipe, pipe is axially stretched in the die cavity that a group of being arranged in the middle of the swager forges mould; Under the rotating disk effect of rotation at a high speed, a power transmission that is subjected to sunk key gap restriction piece that shakes, can make rectilinear motion periodically back and forth, this is forged the hitting power that mould produces double vibrations, thereby to stretching into the surface forging of the pipe in the die cavity gradually, this end caliber is dwindled gradually, but become the process duct of one section clamping;
(2) traction stretching process: on the traction stretching device, the process duct of copper pipe pipe one end is passed the die cavity of stretching die, the clamping piece clamping that can be horizontally slipped; The other end of core bar from pipe stretched in the pipe, make the die head at place, core bar end, arrive the die cavity position of stretching die,, regulate this core bar and stretch into the interior degree of depth of die cavity, with the degree of control stretching again by being enclosed within the adjustment screw thread on the core bar outer surface; In order to the grip slipper of geometrical clamp module, driven by the hydraulic cylinder under hydraulic control system control, reciprocatingly slide as horizontal direction, traction copper pipe pipe passes stretching die and stretches, and stretching through one or many becomes one-level reducer pipe or multi-stage reducing pipe.
A kind of device of implementing said method, comprise swager and a kind of traction stretching device, it is characterized in that, this traction stretching device is by a hydraulic control and trailer system, the grasping system that links with this system and one or two drawing process lines are formed, wherein, grasping system comprises and can and be fixed on one group or two groups of clamping pieces on this grip slipper at the grip slipper that slides on the guide rail; And the drawing process line comprises clamping piece, stretching die and the core bar with same center line, and wherein, stretching die is fixed on the die holder, the process duct of copper pipe pipe one end, pass the die cavity of stretching die after, by clamping piece clamping, thereby realize tractive; The head of core bar then fixture has a die head, and the position of the core bar other end is regulated by cover adjustment screw thread on its outer surface.
Purpose of the present invention can also reach by following measure:
The control of above-described hydraulic control system, by the Magnetic Induction travel switch and the electronic circuit thereof that are arranged on the hydraulic cylinder, the speed of step-less adjustment piston rod and advance and retreat stroke, thereby the operation of the grip slipper that drive and manipulation link to each other with piston rod.
Above-described swager, in the middle of the groove of rotating disk thereon, device has one group to forge mould, and this forges the die cavity of mould, and its cross section ovalize, longitudinal profile outline line are symmetrical involute.
Adjustment screw thread in the above-described drawing process line is installed on the holder, and this holder can slide in the dovetail groove on the frame.
Method and apparatus of the present invention compared with the prior art, has following advantage:
1. than the welding reducer pipe of welding procedure manufacturing, the production efficiency height, easy to operate, operation only and half, the manufacturing cycle shortens greatly, reliability improves greatly, the reappearance of product, it is less relatively to detect the control point, finished product outward appearance slyness, do not have the vestige of connection, no chlorination skin does not need pickling, minimizing is to the pollution of environment, equipment needed thereby is less, and cost is also lower, can replace old technology fully.
2. than oblique roll process, drawing process of the present invention is more suitable for making the little capillary brass pipe in the thin aperture of refrigeration copper reducer pipe, especially wall, can make that smooth surface, size are accurate, the one or many stretching reducer pipe of seamless continuous transition.
3. forge the die cavity shape and the structure of mould, be suitable for pipe and stretch to die cavity, resistance is very little, and the suffered power that forges is even, makes process duct smooth surface, no burr, facilitates penetration of stretching die, and the minimizing enhanced stretch resistance, avoid pipe to be broken, also improved and forged efficient.
4. by adjusting screw thread the degree of depth that core bar (that is to its die head) enters in the pipe is finely tuned, can control the size of institute's stretching caliber better,, can cause the reducer pipe sky to draw phenomenon because shallow as stretching into; As stretch in the die cavity deeply excessively, and can increase enhanced stretch resistance, pipe is easily broken.Add the accurate location of hydraulic system travel switch to drawing process, can adjust tensile force to optimum state, the reducer pipe that can stretchedly efficiently close the symbol specification requirement comes.
5. adopt hydraulic control and trailer system, can make to stretch steadily, avoided impulsive force, the reducer pipe smooth surface of pulling out, favorable reproducibility also is difficult for causing device damage.
6. the holder of screw thread is adjusted in carrying, can slide in dovetail groove, adjusts easy to operate.
Description of drawings
Fig. 1 is the schematic diagram of the transition conduit of refrigeration copper pipe;
Fig. 2 is a schematic diagram capillaceous;
Fig. 3 is the welded pipe schematic diagram after transition conduit and the capillary welding;
Fig. 4 is the schematic diagram of stretching reducer pipe;
Fig. 5 is a kind of schematic diagram of one-level reducer pipe;
Fig. 6 is a kind of schematic diagram of multi-stage reducing pipe;
Fig. 7 is the structural representation of swager;
Fig. 8 is one group of separation schematic diagram that forges mould;
Fig. 9 is this structural representation that forges the module front;
Figure 10 is one of them side direction view that forges mould;
Figure 11 is before pipe forges and forges the schematic diagram that concerns of mould;
Figure 12 is that pipe forges back and the schematic diagram that concerns that forges mould;
Figure 13 is the structural relation schematic diagram of traction stretching device;
Figure 14 is the structural scheme of mechanism of traction stretching device;
Figure 15 is a core bar guiding mechanism schematic diagram;
Among each figure, the 1st, transition conduit, the 2nd, capillary, the 3rd, welded pipe, the 4th, stretching reducer pipe, the 5th, one-level reducer pipe, the 6th, a kind of multi-stage reducing pipe, the 7th, swager, 7-1 are the motors of this machine, 7-2 represents the driving-belt of this machine, and 7-3 is the rotating disk of this machine, and 7-4 is its fixedly ring seat, 7-5 is the cylinder on the ring seat, and 7-6 is the power transmission piece that shakes, and 7-7 is a key, 8,8` is one group and forges mould, the 9th, and copper pipe pipe, 9-1 are the segment process pipes on the pipe, 10 expression hydraulic control and trailer systems, the 11st, hydraulic cylinder, the 12nd, oil pump, the 13rd, piston cylinder, the 14th, grip slipper, the 15th, clamping piece, the 16th, die holder, the 17th, stretching die, the 18th, holder, the 19th, adjust screw thread, the 20th, core bar, 20-1 is the die head on it, the 21st, and dovetail groove, the 22nd, Magnetic Induction travel switch.
The specific embodiment
Device of the present invention mainly comprises a kind of swager 7 and a kind ofly is arranged on a traction stretching device on the frame.Wherein, swager 7 is selected a kind of motor 7-1 that includes for use, driving-belt 7-2, rotating disk 7-3, fixing ring seat 7-4, cylinder 7-5, power transmission shake piece 7-6 and one group of machinery that forges that forges mould 8,8`.Wherein motor passes through driving-belt, driving rotating disk 7-3 rotates at a high speed, fixedly be fixed with many cylinder 7-5 on the ring seat 7-4, one group forges mould 8,8` and places in the middle of the groove on the rotating disk, respectively there is the power transmission piece 7-6 that shakes on both sides, and the groove of piece is wideer slightly than key 7-7, gapped between the two because power transmission is shaken, the power transmission piece that shakes is limited in can coming and going moving linearly in this gap; During dial rotation, the power transmission on the both sides arc surface on the piece outside that shakes with the contacting/throw off of cylinder 7-5 generating period, forges mould 8,8` and just is subjected to the shake hitting power of this approximate simple harmonic oscillation of piece of power transmission, and the copper pipe pipe in the die cavity is forged uniformly.And forge the cavity design of mould 8,8`, and adopt a kind of special structure, promptly its cross section ovalize vertically is an involute, makes when pipe axially stretches into, resistance is very little, makes out the carrot-free process duct of smooth surface.
The traction stretching device of apparatus of the present invention, by a hydraulic control and trailer system, the grasping system that links with this system and one or two drawing process lines are formed.Wherein, hydraulic control and trailer system 10 are electromechanical integrated devices of a routine, adopt hydraulic press and programme controlled electronic circuit, include hydraulic cylinder 11, and oil pump 12 and piston cylinder 13, hydraulic cylinder are provided with one group of Magnetic Induction travel switch 22.Programme-control includes pump start/shut down procedure; auto-feed and hand feed program; foot-actuated switch is arranged, the protection of advancing, retreat protection and use travel switch, and electronic components such as A.C. contactor, electrothermal relay, general-purpose relay, the time relay, air switch.Piston rod 13 directly links with grip slipper 14 as workbench, drives grasping systems by the hydraulic cylinder programme-control under 11, does the round slip of horizontal direction.This grasping system comprises the grip slipper 14 that is arranged on the guide rail and is fixed on one group or two groups of clamping pieces 15 on this grip slipper that the clamping piece is in order to the process duct 9-1 of clamping pipe one end.Under the situation of two groups of clamping pieces, device has two drawing process lines, and every processing line includes clamping piece 15, and stretching die 17 and core bar 20 all have same center line; Wherein stretching die 17 is fixed on the die holder 16, and the end of core bar 20 is with one and adjusts screw thread 19, and the core bar position is finely tuned; The head of core bar is a die head 20-1, stretches into appropriate location in the stretching die die cavity.Adjust screw thread 19, then be installed on the holder 18, this holder can slide in the dovetail groove on the frame.
When carrying out drawing process, at first an end of pipe 9 is axially stretched in the die cavity that on the swager one group forges mould 8,8`, forge into one section process duct 9-1 that diameter is very little, so that pass stretching die by clamping piece 15 clampings.Require this process duct smooth surface not have burr, flawless, wrinkle etc.Again the other end of core bar 20 from pipe 9 stretched in the pipe, make the appropriate location of the die head 20-1 arrival stretching die die cavity of core bar head, finely tune by adjusting screw thread 19 again, make the reducer pipe that is stretched meet technological requirement.Dark as if stretching into, can increase enhanced stretch resistance, pipe is easily broken; Cross the shallow sky that then easily causes and draw phenomenon, cause internal diameter size and inner surface fineness is all defective.Hydraulic system starts when stretching, and to predetermined length, Magnetic Induction travel switch 22 can the control piston bar 13 stops in the precalculated position.The reducer pipe of transfering to core bar and having stretched, piston rod resets, and stretches next time.As above constitute method and apparatus of the present invention.
Claims (5)
1. the manufacture method of a reducer pipe adopts mechanical traction that the copper pipe pipe is stretched, and it is characterized in that, this traction drawing process comprises that pipe end swages and draw the stretching two procedures:
(1). the pipe end operation of swaging: insert a module in the end pipe of copper pipe pipe (9), pipe is axially stretched in the die cavity that a group of being arranged in the middle of the swager (7) forges mould (8,8`); Under rotating disk (7-3) effect of rotation at a high speed, the power transmission piece (7-6) that shakes is made rectilinear motion periodically back and forth, this is forged mould produce the hitting power of vibration repeatedly, thereby to stretching into the surface forging of the pipe (9) in the die cavity gradually, this end caliber is dwindled gradually, but become the process duct (9-1) of one section clamping;
(2). the traction stretching process: on the traction stretching device, the process duct (9-1) of copper pipe pipe (9) one ends is passed the die cavity of stretching die (17), clamping piece (15) clamping that can be horizontally slipped; The other end of core bar (20) from pipe stretched in the pipe, make the die head (20-1) at place, core bar end, arrive the die cavity position of stretching die (17), again by being enclosed within the adjustment screw thread (19) on the core bar outer surface, regulate this core bar and stretch into the interior degree of depth of die cavity, with the degree of control stretching; Grip slipper (14) in order to geometrical clamp module (15), driven by the hydraulic cylinder (11) under hydraulic control system control, reciprocatingly slide as horizontal direction, traction copper pipe pipe (9) passes stretching die (17) and stretches, and stretching through one or many becomes one-level reducer pipe (5) or multi-stage reducing pipe (6).
2. device of implementing the described method of claim 1, comprise swager (7) and a kind of traction stretching device, it is characterized in that, this traction stretching device is by a hydraulic control and trailer system, grasping system with this system's binding, form with one or two drawing process lines, wherein grasping system comprises the grip slipper (14) that can slide on guide rail, with one group or two groups of clamping pieces (15) being fixed on this grip slipper: and the drawing process line comprises the clamping piece (15) with same center line, stretching die (17) and core bar (20), wherein, stretching die (17) is fixed on the die holder (16), the process duct (9-1) of copper pipe pipe one end, can pass the die cavity of stretching die, by clamping piece (15) clamping, the head of core bar (20) has a die head (20-1), and the position of the core bar other end is regulated by cover adjustment screw thread (19) on its outer surface.
3. the manufacture method of reducer pipe according to claim 1, it is characterized in that, the control of described hydraulic control system, by the Magnetic Induction travel switch (22) and the electronic circuit thereof that are arranged on the hydraulic cylinder (11), the speed of step-less adjustment piston rod (13) and advance and retreat stroke, thereby the operation of the grip slipper (14) that manipulation is attached thereto.
4. reducer pipe manufacturing installation according to claim 2 is characterized in that, described swager (7), in the middle of the groove of rotating disk thereon (7-3), device has one group to forge mould (8,8`), and this forges the die cavity of mould, its cross section ovalize, longitudinal profile outline line are symmetrical involute.
5. according to claims 2 or 4 described reducer pipe manufacturing installations, it is characterized in that the adjustment screw thread (19) in the described drawing process line is installed on the holder (18), this holder (18) can slide dovetail groove (21) lining on frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310111826 CN1234480C (en) | 2003-10-20 | 2003-10-20 | Method and apparatus for manufacturing reducing pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310111826 CN1234480C (en) | 2003-10-20 | 2003-10-20 | Method and apparatus for manufacturing reducing pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1528542A true CN1528542A (en) | 2004-09-15 |
| CN1234480C CN1234480C (en) | 2006-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310111826 Expired - Fee Related CN1234480C (en) | 2003-10-20 | 2003-10-20 | Method and apparatus for manufacturing reducing pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1234480C (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101912896A (en) * | 2010-07-20 | 2010-12-15 | 阮继成 | Method for manufacturing reducing pipe and die assembly thereof |
| CN102211113A (en) * | 2011-05-04 | 2011-10-12 | 文富祥 | Process for producing variable diameter pipe |
| CN102218491A (en) * | 2011-03-09 | 2011-10-19 | 西安交通大学 | Rotary swaging forming equipment |
| CN102225448A (en) * | 2011-05-05 | 2011-10-26 | 金龙精密铜管集团股份有限公司 | Method for machining reduced copper capillary tube used in air conditioner |
| CN102581153A (en) * | 2012-01-06 | 2012-07-18 | 昌河飞机工业（集团）有限责任公司 | Processing method of closed-up pull rod |
| CN102974633A (en) * | 2012-12-31 | 2013-03-20 | 刘选萍 | Swell-shrink drawing molding process and device for reducing pipes |
| CN103056192A (en) * | 2013-01-28 | 2013-04-24 | 江苏金圣铜业科技有限公司 | Manufacture method of high-conductivity and high-hardness micropore copper pipe |
| CN103821831A (en) * | 2014-02-20 | 2014-05-28 | 上海理工大学 | Lightweight design method for variable-cross-section variable-wall-thickness rotary forging shaft |
| CN103920837A (en) * | 2014-04-11 | 2014-07-16 | 西安交通大学 | Alternating-current servo type rotary forging machine with external reducing mechanism |
| CN104668892A (en) * | 2013-12-02 | 2015-06-03 | 江西昌河航空工业有限公司 | Shell nosing machining technology method for pull rod of helicopter |
| CN108712935A (en) * | 2016-03-11 | 2018-10-26 | 新日铁住金株式会社 | The manufacturing method and the thick steel pipe of difference of poor thickness steel pipe |
| CN108869943A (en) * | 2018-08-30 | 2018-11-23 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of damping type throttling set |
| CN109073247A (en) * | 2016-04-15 | 2018-12-21 | 大金工业株式会社 | The manufacturing equipment of pipe piece |
| CN110202330A (en) * | 2019-06-05 | 2019-09-06 | 山东金马工业集团机械锻造厂 | A kind of processing method of the elongated axis of cone |
| CN112793139A (en) * | 2020-12-16 | 2021-05-14 | 南京康鼎新材料科技有限公司 | A processing device and method for a thin-walled and small-diameter medical reducing tube |
| CN114226477A (en) * | 2021-10-27 | 2022-03-25 | 首都航天机械有限公司 | Novel automatic drawing forming device for spray pipe bundle |
-
2003
- 2003-10-20 CN CN 200310111826 patent/CN1234480C/en not_active Expired - Fee Related
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101912896B (en) * | 2010-07-20 | 2012-09-26 | 阮继成 | Method for manufacturing reducing pipe and die assembly thereof |
| CN101912896A (en) * | 2010-07-20 | 2010-12-15 | 阮继成 | Method for manufacturing reducing pipe and die assembly thereof |
| CN102218491A (en) * | 2011-03-09 | 2011-10-19 | 西安交通大学 | Rotary swaging forming equipment |
| CN102211113A (en) * | 2011-05-04 | 2011-10-12 | 文富祥 | Process for producing variable diameter pipe |
| CN102225448A (en) * | 2011-05-05 | 2011-10-26 | 金龙精密铜管集团股份有限公司 | Method for machining reduced copper capillary tube used in air conditioner |
| CN102225448B (en) * | 2011-05-05 | 2013-10-16 | 金龙精密铜管集团股份有限公司 | Method for machining reduced copper capillary tube used in air conditioner |
| CN102581153A (en) * | 2012-01-06 | 2012-07-18 | 昌河飞机工业（集团）有限责任公司 | Processing method of closed-up pull rod |
| CN102974633A (en) * | 2012-12-31 | 2013-03-20 | 刘选萍 | Swell-shrink drawing molding process and device for reducing pipes |
| CN103056192A (en) * | 2013-01-28 | 2013-04-24 | 江苏金圣铜业科技有限公司 | Manufacture method of high-conductivity and high-hardness micropore copper pipe |
| CN104668892A (en) * | 2013-12-02 | 2015-06-03 | 江西昌河航空工业有限公司 | Shell nosing machining technology method for pull rod of helicopter |
| CN103821831A (en) * | 2014-02-20 | 2014-05-28 | 上海理工大学 | Lightweight design method for variable-cross-section variable-wall-thickness rotary forging shaft |
| CN103920837A (en) * | 2014-04-11 | 2014-07-16 | 西安交通大学 | Alternating-current servo type rotary forging machine with external reducing mechanism |
| CN103920837B (en) * | 2014-04-11 | 2015-10-21 | 西安交通大学 | An AC servo rotary forging machine with an external variable diameter mechanism |
| CN108712935A (en) * | 2016-03-11 | 2018-10-26 | 新日铁住金株式会社 | The manufacturing method and the thick steel pipe of difference of poor thickness steel pipe |
| US11590547B2 (en) | 2016-03-11 | 2023-02-28 | Nippon Steel Corporation | Method of manufacturing variable wall thickness steel pipe and variable wall thickness steel pipe |
| CN109073247A (en) * | 2016-04-15 | 2018-12-21 | 大金工业株式会社 | The manufacturing equipment of pipe piece |
| CN109073247B (en) * | 2016-04-15 | 2020-11-06 | 大金工业株式会社 | Manufacturing equipment for pipeline parts |
| CN108869943A (en) * | 2018-08-30 | 2018-11-23 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of damping type throttling set |
| CN110202330A (en) * | 2019-06-05 | 2019-09-06 | 山东金马工业集团机械锻造厂 | A kind of processing method of the elongated axis of cone |
| CN112793139A (en) * | 2020-12-16 | 2021-05-14 | 南京康鼎新材料科技有限公司 | A processing device and method for a thin-walled and small-diameter medical reducing tube |
| CN114226477A (en) * | 2021-10-27 | 2022-03-25 | 首都航天机械有限公司 | Novel automatic drawing forming device for spray pipe bundle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1234480C (en) | 2006-01-04 |
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