CN115365770A - Method for processing connecting rod head - Google Patents
Method for processing connecting rod head Download PDFInfo
- Publication number
- CN115365770A CN115365770A CN202211139573.3A CN202211139573A CN115365770A CN 115365770 A CN115365770 A CN 115365770A CN 202211139573 A CN202211139573 A CN 202211139573A CN 115365770 A CN115365770 A CN 115365770A
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- CN
- China
- Prior art keywords
- connecting rod
- rod head
- tensioning
- head
- clamping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title abstract description 9
- 238000003801 milling Methods 0.000 claims abstract description 8
- 238000007514 turning Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000003672 processing method Methods 0.000 claims description 9
- 230000008602 contraction Effects 0.000 claims description 4
- 238000003754 machining Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention provides a method for processing a connecting rod head, which comprises the following steps: a. milling an upper plane and a lower plane of the circular ring end by a milling machine; b. the center of the circular ring end is marked on the upper plane or the lower plane through the dividing disc; c. boring a main shaft hole and a step hole through a vertical machining center; d. clamping the connecting rod head through a tensioning device, and turning an arc-shaped groove on a lathe; e. and (5) turning the shaft end. According to the method, a machined reference surface can be determined in step a, a positioning reference is provided for boring machining of the connecting rod head in step c, a clamping plane is provided, the connecting rod head is positioned through a lower plane and is installed on a workbench of a vertical machining center, a pressing plate is pressed on the upper plane of the connecting rod head, the connecting rod head does not need to be clamped through the outer surface of a circular ring end, the condition that radial clamping stress is uneven cannot occur, machining of the connecting rod head is completed, and after disassembling and assembling stress is released, the condition that the size of a shaft hole is out of tolerance and the shape of the shaft hole is elliptical cannot occur.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a method for machining a connecting rod head.
Background
The connecting rod head is a part for transmitting power, is widely applied to mechanical structures, and has a large number of applications in automobiles and ships, for example, an engine connecting rod is a connecting rod head.
Generally, the connecting rod head is an important structural part and needs high strength, so the blank for manufacturing the connecting rod head is generally manufactured by adopting a forging method. The structure of connecting rod head is more special, and general one end is the loop shape, and the other end is axle type structure, and the one end of loop shape generally is equipped with the step hole, because the shape is irregular, when processing the shaft hole, needs to use special tool or anchor clamps to carry out the clamping.
The existing inner hole processing steps of the connecting rod head are as follows: the connecting rod head is clamped by a four-jaw clamp firstly, and then the connecting rod head is clamped on a lathe to lathe a shaft hole, the processing of the connecting rod head is finished due to the fact that the shapes of parts are different and irregular in thickness and the clamping force of each jaw clamp is different, and after the disassembling stress is released, the shaft hole always has the conditions of out-of-dimension and oval appearance, which are caused by the fact that the radial clamping stress is not uniform; in addition, when a groove in the shaft hole is machined, because the small plane is clamped and the small inner hole is corrected very difficultly, the efficiency is low, the quality is difficult to ensure, and the machining quality is ensured by using a tensioning device.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for processing a connecting rod head, which solves the problems of over-tolerance in size and oval appearance of a shaft hole of the connecting rod head processed by the existing processing technology by changing a clamping mode and a processing technology.
In order to achieve the purpose, the technical scheme of the invention is as follows: a processing method of a connecting rod head comprises a shaft end and a circular ring end, wherein the circular ring end comprises an upper plane and a lower plane which are parallel to each other, a main shaft hole, a step hole and an arc-shaped groove are arranged in the circular ring end, and the processing method comprises the following steps:
a. milling an upper plane and a lower plane of the circular ring end by a milling machine;
b. the center of the circular ring end is marked on the upper plane or the lower plane through the dividing disc;
c. boring a main shaft hole and a step hole through a vertical machining center;
d. clamping the connecting rod head through a tensioning device, and turning an arc-shaped groove on a lathe;
e. and turning the shaft end.
In the method, the reference surface for processing can be determined in the step a, a positioning reference is provided for boring processing of the connecting rod head in the step c, a clamping plane is provided, the connecting rod head is positioned through the lower plane and is installed on a workbench of a vertical processing center, the pressing plate is pressed on the upper plane of the connecting rod head, the connecting rod head does not need to be clamped through the outer surface of the circular ring end, the condition of radial clamping stress non-uniformity cannot occur, the connecting rod head is processed, and the conditions of size over-tolerance and elliptical appearance cannot occur in the shaft hole after the dismounting stress is released.
Furthermore, the tensioning device comprises a cylindrical tensioning head and a fastening piece in threaded fit with the tensioning head, the tensioning head comprises a clamping part and a tensioning part, a first counter bore coaxial with the tensioning head is arranged at the end part of the tensioning part, a second counter bore coaxial with the first counter bore is arranged at the bottom of the first counter bore, and an internal thread is arranged in the second counter bore; more than one shrinkage joint is arranged on the tensioning part along the axial direction of the tensioning head; the fastener comprises a threaded part and a conical part, external threads on the threaded part can be matched with internal threads in the second counter bore, the conical part is provided with a conical surface, the sectional area of the conical part is sequentially reduced from the end face of the conical part to the threaded part, and the end part of the conical part is provided with a cavity for rotating the fastener; screwing the fastening piece into the internal thread, sleeving the connecting rod head on the tensioning part, and continuously rotating the fastening piece until the fastening piece is screwed down; and then the clamping part of the tensioning head is placed into a three-jaw chuck of the lathe, and the three-jaw chuck is screwed tightly.
The step is used for processing an arc-shaped groove in a shaft hole, a clamping part of a tensioning head can be used for being quickly connected with a lathe with a three-jaw chuck, a first counter bore is used for accommodating a conical part of a fastening piece, internal threads in a second counter bore are matched with a thread part of the fastening piece, after a contraction joint is formed on the tensioning part, the fastening piece is continuously rotated, the conical part can be propped open after contacting with the first counter bore, radial tension is provided, a workpiece is firmly fixed on the tensioning part, only the fastening piece needs to be screwed down during clamping, only the fastening piece needs to be unscrewed during dismounting, and the workpiece is clamped simply and quickly; the size of the tensioning part is processed into positive tolerance, no gap exists between the workpiece and the tensioning part, the workpiece is not required to be corrected, the scheme has the advantages of simple structure, easiness in disassembly and assembly, reusability and high processing efficiency, and the problems of difficulty in clamping a small plane and correcting a small inner hole, low efficiency and difficulty in ensuring quality are easily solved.
Furthermore, a first boss used for positioning the connecting rod head is arranged on the tensioning part, and when the connecting rod head is clamped, the lower plane of the connecting rod head is in contact with the first boss. This scheme can further improve the positioning accuracy of connecting rod head on the tensioning part.
Furthermore, a second boss used for limiting is arranged on the clamping part, and when the tensioning head is clamped, a clamping jaw of the lathe is in contact with the second boss. The scheme can further improve the positioning precision of the clamping part and the lathe, prevent the tensioning head from generating axis movement, and ensure the machining precision of the connecting rod head.
Drawings
FIG. 1 is a schematic view of a connecting rod head;
FIG. 2 is a schematic view of the connecting rod head clamped to the tensioner;
FIG. 3 is an exploded view of the linkage head and the tensioner;
FIG. 4 is a front view of the tensioning head of the present invention;
fig. 5 is a front view of the fastener of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 5, the connecting rod head 3 includes a shaft end 31 and a ring end 32, the ring end 32 includes two upper planes 323 and lower planes (not shown) parallel to each other, and a spindle hole 321, a stepped hole 320, and an arc-shaped groove 322 are provided inside the ring end 32.
The tensioning device comprises a cylindrical tensioning head 1 and a fastening piece 2 matched with the tensioning head 1 through threads, the tensioning head 1 comprises a clamping part 10 and a tensioning part 11, a first counter bore 12 coaxial with the tensioning head 1 is arranged at the end part of the tensioning part 11, a second counter bore 13 coaxial with the first counter bore 12 is arranged at the bottom of the first counter bore 12, and an internal thread 14 is arranged in the second counter bore 13; more than one contraction joint 15 is arranged on the tensioning part 11 along the axial direction of the tensioning head 1; in this embodiment, the number of the shrinkage joints 15 is two, the two shrinkage joints 15 equally divide the tension portion 11 into two parts, the width of the shrinkage joints 15 is 2 to 3 mm, and the number of the shrinkage joints 15 may be three or more.
A first boss 16 for positioning the connecting rod head 3 is provided on the tension part 11; the second boss 17 for position limitation is provided on the holding portion 10.
The fastener 2 comprises a thread part 21 and a conical part 20, wherein an external thread on the thread part 21 can be matched with an internal thread 14 in the second counter bore 13, the conical part 20 is provided with a conical surface, the sectional area of the conical part 20 is reduced from the end surface of the conical part 20 to the thread part 21 in sequence, and in the embodiment, the conical degree of the conical part 20 is 1.
The end of the conical portion 20 is provided with a cavity for rotating the fastening element 2, which in this embodiment is a regular hexagonal counter bore 22. With the cavity configured as a regular hexagonal counter bore 22, the fastener 2 can be rotated using a conventional hex wrench.
The processing method of the connecting rod head 3 comprises the following steps:
a. milling an upper plane 323 and a lower plane of the circular ring end 32 by a milling machine;
b. the center of the circular ring end 32 is marked on the upper plane 323 by the dividing disc;
c. boring a spindle hole 321 and a step hole 320 through a vertical machining center;
d. clamping the connecting rod head 3 through a tensioning part 11 of the tensioning device, and turning an arc-shaped groove 322 on a lathe;
e. the shaft end 31 is turned.
In the method, the reference surface for processing can be determined in the step a, a positioning reference is provided for boring processing of the connecting rod head 3 in the step c, a clamping plane is provided, the connecting rod head 3 is positioned through the lower plane and is installed on a workbench of a vertical processing center, the pressing plate is pressed on the upper plane of the connecting rod head 3, the connecting rod head 3 does not need to be clamped through the outer surface of the circular ring end 32 any more, the condition that radial clamping stress is uneven cannot occur, the processing of the connecting rod head 3 is completed, and after the disassembling stress is released, the conditions that the size of the spindle hole 321, the stepped hole 320 and the arc-shaped groove 322 is out of tolerance and the shape is oval cannot occur.
One of the operation steps of step d is: the clamping part 10 of the tensioning head 1 is firstly placed into a three-jaw chuck of a lathe, when the second boss 17 abuts against the outer end face of the three-jaw chuck, the three-jaw chuck is locked, the machined step hole 320 of the connecting rod head 3 is sleeved on the excircle of the tensioning part 11, the lower plane of the connecting rod head 3 abuts against the side wall of the first boss 16, generally, the excircle size of the tensioning part 11 is machined to be a positive tolerance, no gap exists between the connecting rod head 3 and the tensioning part 11, the connecting rod head 3 does not need to be corrected, the threaded part 21 of the fastening piece 2 is screwed into the internal thread 14, the fastening piece 2 is continuously rotated through a hexagonal wrench, the conical part 20 can prop open the tensioning part 11 after contacting with the first counter bore 12, radial tension is provided, the connecting rod head 3 is firmly fixed on the tensioning part 11, at the moment, the arc-shaped groove 322 can be turned, after machining is completed, only the fastening piece 2 needs to be unscrewed when disassembling, the machined connecting rod head 3 can be taken down, and then the connecting rod head to be continuously machined, although the connecting rod head structure is not symmetrical, but the connecting rod head structure is small, the dead weight and the eccentric problem does not need to be considered.
The other operation step of the step d is to clamp the connecting rod head 3 on the tensioning part 11, and then clamp the whole of the connecting rod head 3 and the tensioning part 11 on the lathe.
The step is used for processing an arc-shaped groove 322 in a spindle hole 321, a clamping part 10 of a tensioning head 1 can be used for being quickly connected with a lathe with a three-jaw chuck, a first counter bore 12 is used for accommodating a conical part of a fastening piece, an internal thread 14 in a second counter bore 13 is matched with a thread part of the fastening piece 2, after a contraction joint is formed on the tensioning part 11, the fastening piece 2 is continuously rotated, the conical part 20 can be propped open by contacting with the first counter bore 12, radial tension is provided, a connecting rod head 3 is firmly fixed on the tensioning part 11, the fastening piece 2 only needs to be screwed during clamping, the fastening piece 2 only needs to be screwed during dismounting, and the connecting rod head 3 is clamped simply and quickly; the size of the tensioning part 11 is processed into positive tolerance, no gap exists between the connecting rod head 3 and the tensioning part 11, the connecting rod head 3 does not need to be corrected, the scheme is simple in structure, easy to assemble and disassemble, capable of being used repeatedly and high in machining efficiency, and the problems of clamping small planes, difficulty in correcting small inner holes, low efficiency and difficulty in guaranteeing quality are easily solved.
Step e uses the existing fixture for turning the shaft end 31, which is a mature prior art and the detailed structure thereof is not described herein.
The processing method of the connecting rod head has the advantage that the first-grade product rate reaches 100% through practical inspection.
Claims (4)
1. A processing method of a connecting rod head comprises a shaft end and a circular ring end, wherein the circular ring end comprises an upper plane and a lower plane which are parallel to each other, a main shaft hole, a step hole and an arc-shaped groove are arranged in the circular ring end, and the processing method comprises the following steps:
a. milling an upper plane and a lower plane of the circular ring end by a milling machine;
b. the center of the circular ring end is marked on the upper plane or the lower plane through the dividing disc;
c. the connecting rod head is positioned through a lower plane and is installed on a workbench of a vertical machining center, the pressing plate is pressed on an upper plane of the connecting rod head, and a spindle hole and a step hole are bored through the vertical machining center;
d. clamping the connecting rod head through a tensioning device, and turning an arc-shaped groove on a lathe;
e. and (5) turning the shaft end.
2. The connecting rod head processing method as recited in claim 1, wherein:
the tensioning device comprises a cylindrical tensioning head and a fastening piece matched with the tensioning head through threads, the tensioning head comprises a clamping part and a tensioning part, a first counter bore coaxial with the tensioning head is arranged at the end part of the tensioning part, a second counter bore coaxial with the first counter bore is arranged at the bottom of the first counter bore, and internal threads are arranged in the second counter bore; more than one contraction joint is arranged on the tensioning part along the axial direction of the tensioning head; the fastener comprises a threaded part and a conical part, external threads on the threaded part can be matched with internal threads in the second counter bore, the conical part is provided with a conical surface, the sectional area of the conical part is sequentially reduced from the end face of the conical part to the threaded part, and the end part of the conical part is provided with a cavity for rotating the fastener; screwing the fastener into the internal thread, sleeving the connecting rod head on the tensioning part, and continuously rotating the fastener until the fastening part is screwed down; and then the clamping part of the tensioning head is placed into a three-jaw chuck of the lathe, and the three-jaw chuck is screwed tightly.
3. The connecting rod head processing method according to claim 2, wherein: the tensioning part is provided with a first boss for positioning the connecting rod head, and when the connecting rod head is clamped, the lower plane of the connecting rod head is in contact with the first boss.
4. The connecting rod head processing method according to claim 2, wherein: be equipped with on the clamping part and be used for spacing second boss, when clamping tensioning head, the jack catch and the contact of second boss of lathe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211139573.3A CN115365770A (en) | 2022-09-19 | 2022-09-19 | Method for processing connecting rod head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211139573.3A CN115365770A (en) | 2022-09-19 | 2022-09-19 | Method for processing connecting rod head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115365770A true CN115365770A (en) | 2022-11-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211139573.3A Pending CN115365770A (en) | 2022-09-19 | 2022-09-19 | Method for processing connecting rod head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115365770A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001113403A (en) * | 1999-10-15 | 2001-04-24 | Tsugami Tool:Kk | Drill chuck and chuck device |
| CN101028687A (en) * | 2007-03-30 | 2007-09-05 | 沪东重机股份有限公司 | Clamping tool for machining large link rod |
| CN101352795A (en) * | 2007-07-27 | 2009-01-28 | 云南西仪工业股份有限公司 | Method for processing fractured connecting rod for car engine |
| CN103252514A (en) * | 2013-05-17 | 2013-08-21 | 江苏星河阀门有限公司 | Expanding type clamp used on lathe and machining method thereof |
| CN105196013A (en) * | 2015-09-23 | 2015-12-30 | 四川飞亚汽车零部件有限公司 | Novel machining technology for connecting rod |
| CN205218573U (en) * | 2015-11-02 | 2016-05-11 | 哈尔滨电机厂有限责任公司 | Large -scale axial compressor commentaries on classics oar runner ear handle boring clamping instrument for earhole |
| CN107398752A (en) * | 2017-07-06 | 2017-11-28 | 南宫市精强连杆有限公司 | Connecting rod process for machining method and Self-center-positioning mechanism used |
| KR20190122181A (en) * | 2019-10-09 | 2019-10-29 | 구재만 | The collet chuck for CNC automatic lathe |
| CN209737126U (en) * | 2019-03-21 | 2019-12-06 | 济南工程职业技术学院 | Positioning and clamping device for batch processing of shaft sleeve parts of numerical control lathe |
| CN111515616A (en) * | 2019-10-29 | 2020-08-11 | 陈永福 | Machining method of precision bearing seat |
| CN216502430U (en) * | 2022-04-02 | 2022-05-13 | 山东豪迈精锻科技有限公司 | Mandrel machining tool |
| CN218611748U (en) * | 2022-09-01 | 2023-03-14 | 中船华南船舶机械有限公司 | Tensioning device |
-
2022
- 2022-09-19 CN CN202211139573.3A patent/CN115365770A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001113403A (en) * | 1999-10-15 | 2001-04-24 | Tsugami Tool:Kk | Drill chuck and chuck device |
| CN101028687A (en) * | 2007-03-30 | 2007-09-05 | 沪东重机股份有限公司 | Clamping tool for machining large link rod |
| CN101352795A (en) * | 2007-07-27 | 2009-01-28 | 云南西仪工业股份有限公司 | Method for processing fractured connecting rod for car engine |
| CN103252514A (en) * | 2013-05-17 | 2013-08-21 | 江苏星河阀门有限公司 | Expanding type clamp used on lathe and machining method thereof |
| CN105196013A (en) * | 2015-09-23 | 2015-12-30 | 四川飞亚汽车零部件有限公司 | Novel machining technology for connecting rod |
| CN205218573U (en) * | 2015-11-02 | 2016-05-11 | 哈尔滨电机厂有限责任公司 | Large -scale axial compressor commentaries on classics oar runner ear handle boring clamping instrument for earhole |
| CN107398752A (en) * | 2017-07-06 | 2017-11-28 | 南宫市精强连杆有限公司 | Connecting rod process for machining method and Self-center-positioning mechanism used |
| CN209737126U (en) * | 2019-03-21 | 2019-12-06 | 济南工程职业技术学院 | Positioning and clamping device for batch processing of shaft sleeve parts of numerical control lathe |
| KR20190122181A (en) * | 2019-10-09 | 2019-10-29 | 구재만 | The collet chuck for CNC automatic lathe |
| CN111515616A (en) * | 2019-10-29 | 2020-08-11 | 陈永福 | Machining method of precision bearing seat |
| CN216502430U (en) * | 2022-04-02 | 2022-05-13 | 山东豪迈精锻科技有限公司 | Mandrel machining tool |
| CN218611748U (en) * | 2022-09-01 | 2023-03-14 | 中船华南船舶机械有限公司 | Tensioning device |
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