CN102699640A - Fracture splitting processing technology of engine connection link - Google Patents
Fracture splitting processing technology of engine connection link Download PDFInfo
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- CN102699640A CN102699640A CN2012102232004A CN201210223200A CN102699640A CN 102699640 A CN102699640 A CN 102699640A CN 2012102232004 A CN2012102232004 A CN 2012102232004A CN 201210223200 A CN201210223200 A CN 201210223200A CN 102699640 A CN102699640 A CN 102699640A
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- connection link
- cracking
- processing technology
- connecting rod
- blank
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Abstract
The invention discloses a fracture splitting processing technology of an engine connection link. The fracture splitting processing technology comprises the steps of: roughly machining a connection link blank, carrying out normalizing treatment on the connection link blank so as to enable the hardness of the blank to be 28-42HRC (rockwellhardness), providing a crack hole, symmetrically providing two crack holes with equal sizes on two ends of a large head of the connection rod blank; providing a splitting groove, and symmetrically providing V-shaped splitting grooves on the inner wall of the connection link; carrying out carburizing and quenching, and carrying out gas carburizing and quenching on the processing surfaces of large and small head holes of the connection link and the crack holes so as to enable the hardness of the surface is up to 60-64HRC, and carrying out redirect cracking, post-treatment and flow detection. The large head hole of the engine connection link produced by the technique has a smooth surface and is suitable for being matched with a rolling bearing; the crack surface quality of the connection link is excellent, and the processing technology conforms to the operating requirements of a high-rotation-speed engine.
Description
Technical field
The present invention relates to a kind of machining technology for engine connecting rod, particularly relate to a kind of cranking processing technology of engine link.
Background technology
The engine link motion state is complicated, in the course of work pressure conversion frequent, require to have the very high accuracy of manufacture and mechanical performance.Processing modes such as seam location, pin-and-hole location require the locating surface machining accuracy high, so its procedure of processing is loaded down with trivial details, difficulty is bigger, and yield rate is low.Connecting rod cracking processing realizes the bowl cover location, and positioning accuracy is high, and faying face does not need processing, has therefore simplified procedure of processing, reduces production costs.In some high workload rotating speed engines, crank pin end pore is a rolling bearing, thus require crank pin end pore to have smooth continuous surface, so common connecting rod cracking technology is not suitable for processing this type of connecting rod.
Summary of the invention
The purpose of this invention is to provide a kind of cranking processing technology that is applicable to the engine link of processing high workload rotating speed, the engine link big end hole that uses this process to produce has smooth surface, is suitable for rolling bearing and matches.
Technical scheme of the present invention is such: a kind of engine link cranking processing technology may further comprise the steps:
Connecting rod blank roughing is carried out normalized treatment to connecting rod blank, makes that blank hardness is 28-42HRC;
Offer the cracking hole, symmetry is offered two equal-sized cracking holes at connecting rod blank major part two ends;
Offer splitter, offer the V-type splitter in connecting rod inwall symmetry;
Carburizing and quenching is handled, and the gas carburizing Quenching Treatment is carried out in connecting rod concentric reducer hole and cracking hole finished surface, makes case hardness reach 60-64HRC;
Directed cracking, post processing, flaw detection.
Locate when being beneficial to the directed cracking of connecting rod, said cracking hole outside diameter 5.5mm, tapering is 1: 45.
In order to obtain higher cracking quality, 55-60 ° of said V-type groove subtended angle, radius of curvature 10-12mm, groove depth 0.6-0.7mm.
The advantage of technical scheme provided by the present invention is; Crank pin end pore has smooth surface, is suitable for rolling bearing and matches, and the cracking technology location accurately; Need not too big cracking strength during cracking and just can accomplish processing; Notch effect reduces, and connecting rod cracking cross section quality is excellent, meets the rev-happy engine instructions for use.
The specific embodiment
Below in conjunction with embodiment the present invention is described further, but not as to qualification of the present invention.
With 20CrMoA low-alloy structural steel material connecting rod is example; At first blank is processed in its die forging, and carries out normalized treatment and make the connecting rod core hardness reach 36HRC, offer outside diameter 5.5mm at the big end two ends then; Tapering is two cracking holes of 1: 45; Two cracking hole sizes equate, and are symmetrically distributed two ends uniformity when helping cracking like this.Adopt the line cutting processing to offer the V-type splitter in connecting rod inwall symmetry, 55 ° of V-type splitter subtended angles, radius of curvature 10mm, groove depth 0.6mm.The selection of subtended angle is mainly considered easy to process; The influence of the size of cracking strength and notch effect when groove depth and radius of curvature are then considered the cracking operation; Excessive groove depth will influence connecting rod strength, too small bigger cracking strength, the cracking face difficult quality guarantee simultaneously of then needing.Connecting rod to offering cracking hole and splitter carries out the surface gas carburizing and quenching, makes case hardness reach 60HRC, carburizing depth 0.8mm.Treat cracking connecting-rod and carry out orientation location cracking, load cracking strength in the cracking process gradually and guarantee the cracking quality.Connecting rod to after the cracking cleans with gasoline, and the connecting-rod bolts of screwing on are at last proceeded end face and big aperture fine finishining, detect a flaw at last finished product.
Claims (3)
1. engine link cranking processing technology may further comprise the steps:
Connecting rod blank roughing is carried out normalized treatment to connecting rod blank, makes that blank hardness is 28-42HRC;
Offer the cracking hole, symmetry is offered two equal-sized cracking holes at connecting rod blank major part two ends;
Offer splitter, offer the V-type splitter in connecting rod inwall symmetry;
Carburizing and quenching is handled, and the gas carburizing Quenching Treatment is carried out in connecting rod concentric reducer hole and cracking hole finished surface, makes case hardness reach 60-64HRC;
Directed cracking, post processing, flaw detection.
2. engine link cranking processing technology according to claim 1 is characterized in that: said cracking hole outside diameter 5.5mm, tapering is 1: 45.
3. engine link cranking processing technology according to claim 1 is characterized in that: 55-60 ° of said V-type groove subtended angle, radius of curvature 10-12mm, groove depth 0.6-0.7mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102232004A CN102699640A (en) | 2012-06-29 | 2012-06-29 | Fracture splitting processing technology of engine connection link |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102232004A CN102699640A (en) | 2012-06-29 | 2012-06-29 | Fracture splitting processing technology of engine connection link |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102699640A true CN102699640A (en) | 2012-10-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102232004A Pending CN102699640A (en) | 2012-06-29 | 2012-06-29 | Fracture splitting processing technology of engine connection link |
Country Status (1)
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| CN (1) | CN102699640A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110587241A (en) * | 2019-10-10 | 2019-12-20 | 吉林大学 | Method for manufacturing engine connecting rod |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4693139A (en) * | 1984-09-14 | 1987-09-15 | Honda Giken Kogyo Kabushiki Kaisha | Connecting rod of reciprocating motion system and method for producing the same |
| US5208979A (en) * | 1991-09-19 | 1993-05-11 | Howard Schmidt | Prefracture laser formation of a stress riser groove |
| CN1623043A (en) * | 2002-07-11 | 2005-06-01 | 雅马哈发动机株式会社 | Connecting rod split construction |
| CN101444884A (en) * | 2008-12-18 | 2009-06-03 | 浙江跃进机械有限公司 | Machining process of engine connecting rod |
| CN101704180A (en) * | 2009-09-14 | 2010-05-12 | 奇瑞汽车股份有限公司 | Processing method of engine connecting rod |
-
2012
- 2012-06-29 CN CN2012102232004A patent/CN102699640A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4693139A (en) * | 1984-09-14 | 1987-09-15 | Honda Giken Kogyo Kabushiki Kaisha | Connecting rod of reciprocating motion system and method for producing the same |
| US5208979A (en) * | 1991-09-19 | 1993-05-11 | Howard Schmidt | Prefracture laser formation of a stress riser groove |
| CN1623043A (en) * | 2002-07-11 | 2005-06-01 | 雅马哈发动机株式会社 | Connecting rod split construction |
| CN101444884A (en) * | 2008-12-18 | 2009-06-03 | 浙江跃进机械有限公司 | Machining process of engine connecting rod |
| CN101704180A (en) * | 2009-09-14 | 2010-05-12 | 奇瑞汽车股份有限公司 | Processing method of engine connecting rod |
Non-Patent Citations (1)
| Title |
|---|
| 周春强等: "发动机连杆裂解应力槽加工技术研究", 《电加工与模具》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110587241A (en) * | 2019-10-10 | 2019-12-20 | 吉林大学 | Method for manufacturing engine connecting rod |
| CN110587241B (en) * | 2019-10-10 | 2021-08-13 | 吉林大学 | Method for manufacturing engine connecting rod |
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Application publication date: 20121003 |