CN105710620A - Manufacturing process for conjunction-tooth gear of car transmission - Google Patents
Manufacturing process for conjunction-tooth gear of car transmission Download PDFInfo
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- CN105710620A CN105710620A CN201610191244.1A CN201610191244A CN105710620A CN 105710620 A CN105710620 A CN 105710620A CN 201610191244 A CN201610191244 A CN 201610191244A CN 105710620 A CN105710620 A CN 105710620A
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- forging
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- forming
- tooth
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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
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a manufacturing process for a conjunction-tooth gear of a car transmission. The manufacturing process comprises the following process steps: (1) warm-forging precision forming: heating a metal blank to achieve a blank temperature of not greater than 950 DEG C, and carrying out precision die-forging to form a shape structure of the conjunction teeth of the car transmission, and a tooth shape structure; (2) cold finishing: carrying out end surface tooth forging-pressing forming at normal temperature; and (3) reverse tapered tooth forming: carrying out reverse tapered tooth forming at normal temperature by virtue of a radial extrusion method. The manufacturing process is simple and has few procedures, the warm-forging precision forming is carried out in one process, cold-forging is carried out after waste heat normalizing, and the surface of the gear is prevented from decarburization; the produced product is complete in metal flow line, high in comprehensive mechanical properties, stable in quality and high in accuracy, high in production efficiency, energy-saving, low in cost, and capable of improving production environment and meeting environment protection requirements.
Description
Technical field
The invention belongs to forging and molding technical field, relate to a kind of gear manufacturing technology, particularly relate to saloon car transmission in conjunction with the cold duplex forging forming technology of gear temperature.
Background technology
Saloon car transmission is mainly used in car speed-change and gearshift in conjunction with gear, thus changing transmission speed ratio, expand the excursion of driving torque and rotating speed, to adapt to often change the driving conditions of rotating ratio, electromotor can be made to work oil consumption is relatively low when dynamic rate is higher simultaneously.Saloon car transmission belongs to saloon car transmission key components and parts in conjunction with gear, requires significantly high to its accuracy of manufacture and Gear Surface Strength.Existing saloon car transmission is in conjunction with gear manufacturing process, one is traditional cutting and technique for welding, cutting and technique for welding are simple, easily realize producing, the gear teeth face precision of processing is high, but material metal streamline is cut off in production process, gear tooth intensity is same as strength of parent, the strength of gear teeth of this explained hereafter is low, it is susceptible to tooth and damages phenomenon, two is study on precision forging technology, at present, saloon car transmission is in conjunction with the study on precision forging technology of the commonly used advanced technology of gear, this technique can be divided into hot finish forge and cold closed-die forging two kinds, blank heating during hot finish forge, temperature is typically in about 1150 DEG C, owing to blank softening degree is high, resistance to deformation power is little, easily shape, production efficiency is also high, the Mass accuracy of mould is required and billet size requires also not high, but, hot finish forge is high to blank heating temperature, heat time heating time is long, blank interior tissue changes, coarse grains, blank surface oxidation and decarbonization is serious, directly affect gear surface quality, especially teeth portion quality is affected, tooth base after precision forging, generally require by reheat isothermal normalizing process make blank interior tissue be restored to normal condition, then later process processing is carried out.Cold Precision Forging Process of Spur blank is all precision forging under room temperature state, it is absent from hot finish forge Problems existing, but, resistance to deformation power is big at normal temperatures for blank, finish forge cold press equipment tonnage used is big, mould strength requires also significantly high, secondly the dimensional requirement of blank blanking is also significantly high, otherwise it is easily damaged mould, although required tonnage is big when cold closed-die forging blank shapes, but metal streamline can be retained preferably, teeth portion intensity after extrusion molding is high, hot forging is with Cold Precision Forging Process of Spur comparatively speaking, cold closed-die forging blank forming technology is complicated, operation is also many, and finish forge cold press equipment and shaping dies are required also high.Within 2002, Chinese patent 1337284A discloses a kind of manufacture of combining tooth blank for automobile gear box, the processing method adopting precision forging, first blank is carried out cold drawn section preform, again toothed section is carried out precision die forging shaping, finally on cold extrusion press after cold-finishing, the back taper that radial compression method carries out teeth portion is adopted to shape.In described cold drawn section performing process, first blank is carried out spheroidizing, peeling base, and after phospholeumization processes, then on rotary forging press, carry out cold drawn section preform.Cold drawn section preform tooth base is carried out non-oxidation annealing, and makees after phospholeumization processes, to adopt precise forging die to carry out teeth portion precision forging on forcing press.The tooth base of precision forging carries out isothermal normalizing process and after phospholeumization process, cold extrusion press carry out cold-finishing, and adopts radial extruding die to carry out teeth portion back taper shaping.
Blank is first carried out spheroidizing, peeling base by this patented technology, and after phospholeumization processes, then on rotary forging press, carry out cold pendulum stone roller preform；Then non-oxidation annealing is carried out, and make after phospholeumization processes, to adopt precise forging die to carry out teeth portion precision forging on forcing press, then the tooth base of precision forging is carried out isothermal normalizing process and after phospholeumization processes, cold extrusion press carries out cold-finishing, and adopts radial extruding die to carry out teeth portion back taper shaping.Adopt technique scheme, it is not necessary to carry out machining, save material, preform, precision forging and cold-finishing all on forcing press moment complete, efficiency is high, and certain cost also just reduces.The processing method adopting the present invention, in conjunction with tooth without escape, unstressed concentration phenomenon, teeth portion intensity improves；Tooth base extrusion molding on precision die, its metal streamline does not destroy, and material comprehensive mechanical performance is improved, good product performance, steady quality, can meet the instructions for use of high-grade car.
But the annealing of this patented technology spheroidizing, non-oxidation, isothermal normalizing are accomplished by carrying out three times, waste the energy；Integral blank is through twice phospholeum, and phospholeumization produces waste residue waste gas etc. can be affected to some extent on environment.Therefore the production cycle is long, cost is high, and secondly, three times heat treatment heating-up temperature is all higher, and the time is long, it is easy to gear surface decarburization in various degree occurs, brings impact to postorder heat treatment process.
Summary of the invention
The present invention provides a kind of and adopts warm cold duplex forging forming technique, and forging and molding saloon car transmission is in conjunction with gear manufacturing process, and manufacturing process technique is simple, operation is few for this, and one time warm forging essence shapes, cold forging after afterheat normalizing, gear surface not decarburization；The product not only metal streamline produced is complete, comprehensive mechanical performance is high, steady quality precision is high, production efficiency is high, and it is low to save energy cost, can improve again production environment and meet environmental requirement.
The present invention is achieved by the following technical solution:
Saloon car transmission, in conjunction with gear manufacturing process, comprises the technical steps that:
1. Warm forging precise forming: add hot metal billets, blank temperature≤950 DEG C, precision die forging shapes saloon car transmission in conjunction with tooth profile configuration and tooth-shape structure；
2. cold-finishing: carry out end face teeth portion excellent suitability for press forming at normal temperatures；
3. teeth shapes: adopt radial compression method to carry out teeth portion back taper shaping at normal temperatures.
In described step 1. Warm forging precise forming process, first blank is carried out sandblasting base, coating heating after die-forging forming；Carrying out afterheat normalizing again after punching: utilize the waste heat that warm forging is formed, the blank after warm forging being shaped is sent into isothermal normalizing furnace and is carried out afterheat normalizing, makes material inside organization return to normal condition, blank hardness HRB≤86.
In described step 2. cold-finishing process, first the blank after Warm forging precise forming is carried out sandblasting lubricated then cold-forging forming.
Described step 1. Warm forging precise forming can be divided into base preform and precision form, and described base preform includes: after the heating of fracture, sandblasting base, coating, jumping-up, blocking shapes；Described precision form: the blank after being shaped by blocking puts in finisher monolithic molding saloon car transmission in conjunction with tooth profile configuration and tooth-shape structure；Punching again after precision form, finally carries out afterheat normalizing.
The present invention compared with prior art has the advantages that
1, the present invention and the hot forging of prior art are the difference is that heating-up temperature, it is low that warm forging technology utilization METAL HEATING PROCESS of the present invention is transformed into yield strength during austenite, it is prone to the feature that working plasticity shapes, first by blank heating 220 DEG C ± 20 DEG C, automatic spray-on coating liquid, finally heats to 930 DEG C ± 20 DEG C simultaneously, heating-up temperature is not more than 950 DEG C, uninterruptedly disposable completing is heated and coating, both ensure that blank surface not decarburization in heating process, decreases again heating times and saves the energy；And the hot finish forge heating-up temperature of prior art is at about 1150 DEG C, the overheated oxidation and decarbonization of blank surface.
2, the waste heat after present invention Appropriate application warm forging simultaneously carries out isothermal normalizing, makes material inside organization be adjusted to normal condition, saves the energy and be conducive to postorder to process, reducing cost.
3, the present invention is to blank brushing polymeric lubricant, it is to avoid integral blank carries out harmful waste liquid that phospholeum process brings to environment, protects production environment.
4, due to the fact that operation is few, improve production efficiency, product quality have also been obtained guarantee, meets the development trend of current auto manufacturing.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention blank deformation process chart.
Sequence number in figure: 1, joint portion, 2, straight-tooth, 3, conical tooth.
Detailed description of the invention
By the examples below and in conjunction with accompanying drawing technical scheme is described in further detail.
Embodiment: referring to accompanying drawing 1, a kind of saloon car transmission, in conjunction with gear manufacturing process, comprises the technical steps that:
1. Warm forging precise forming: fracture: 20CrMoH material, adopts circular sawing machine fracture, intercepts metal bar by drawing dimensional requirement；Blasting treatment: blank carries out blasting treatment, removes blank surface oxide layer；Coating heats: by blank heating to 930 DEG C ± 20 DEG C, simultaneously to blank surface spray-on coating liquid, and uninterruptedly disposable completing is heated and coating；Jumping-up: the blank after coating being heated is placed on jumping-up in warmed-up mould, mold preheating temperature 220 DEG C ± 20 DEG C；Blocking shapes；Precision form: the blank after being shaped by blocking puts in finisher monolithic molding saloon car transmission in conjunction with tooth profile configuration and straight-tooth 2 tooth-shape structure；Punching: remove joint portion 1；Afterheat normalizing: temperature controls, at 660 DEG C ± 10 DEG C, to utilize the waste heat that warm forging is formed, sends the blank after punching into isothermal normalizing furnace and carries out afterheat normalizing, make material inside organization return to normal condition, blank hardness HRB≤86；
2. cold-finishing: first the blank after Warm forging precise forming is carried out sandblasting lubricated, then carries out end face teeth portion excellent suitability for press forming at normal temperatures；
3. teeth shapes: adopts radial compression method to carry out teeth portion back taper shaping at normal temperatures, forms conical tooth 3；
4. carburizing and quenching after design drawing dimensional requirement Vehicle Processing is pressed: carburized layer thickness 0.4-0.8mm, hardness HRC60 ± 2.
It is low that warm forging technology utilization METAL HEATING PROCESS of the present invention is transformed into yield strength during austenite, the feature being prone to working plasticity shaping carries out forging and molding, first by blank heating 220 DEG C ± 20 DEG C, automatic spray-on coating liquid simultaneously, finally heating to 930 DEG C ± 20 DEG C, heating-up temperature is not more than 950 DEG C, and uninterruptedly disposable completing is heated and coating, both ensure that blank surface not decarburization in heating process, and decreased again heating times and save the energy；Waste heat after present invention Appropriate application warm forging simultaneously carries out isothermal normalizing, the blank that afterheat normalizing is after warm forging shapes carries out afterheat normalizing at 660 DEG C ± 10 DEG C entrance heat-treatment production lines, material inside organization is made to be adjusted to normal condition, save the energy and be conducive to postorder to process, reducing cost.
Embodiment is only to facilitate understand technical scheme; it is not intended that limiting the scope of the invention; every without departing from any simple modification, equivalent variations and the modification perhaps according to the technical spirit of the present invention, above scheme made in technical solution of the present invention, all still fall within scope.
Claims (4)
1. saloon car transmission is in conjunction with gear manufacturing process, comprises the technical steps that:
1. Warm forging precise forming: add hot metal billets, blank temperature≤950 DEG C, precision die forging shapes saloon car transmission in conjunction with tooth profile configuration and tooth-shape structure；
2. cold-finishing: carry out end face teeth portion excellent suitability for press forming at normal temperatures；
3. teeth shapes: adopt radial compression method to carry out teeth portion back taper shaping at normal temperatures.
2. saloon car transmission according to claim 1 is in conjunction with gear manufacturing process, it is characterised in that: in described step 1. Warm forging precise forming process, first blank is carried out sandblasting base, coating heating after die-forging forming；Carrying out afterheat normalizing again after punching: utilize the waste heat that warm forging is formed, the blank after warm forging being shaped is sent into isothermal normalizing furnace and is carried out afterheat normalizing, makes material inside organization return to normal condition, blank hardness HRB≤86.
3. saloon car transmission according to claim 1 is in conjunction with gear manufacturing process, it is characterised in that: in described step 2. cold-finishing process, first the blank after Warm forging precise forming is carried out sandblasting lubricated then cold-forging forming.
4. saloon car transmission according to claim 1 is in conjunction with gear manufacturing process, it is characterized in that: described step 1. Warm forging precise forming can be divided into base preform and precision form, and described base preform includes: after the heating of fracture, sandblasting base, coating, jumping-up, blocking shapes；Described precision form: the blank after being shaped by blocking puts in finisher monolithic molding saloon car transmission in conjunction with tooth profile configuration and tooth-shape structure；Punching again after precision form, finally carries out afterheat normalizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610191244.1A CN105710620A (en) | 2016-03-30 | 2016-03-30 | Manufacturing process for conjunction-tooth gear of car transmission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610191244.1A CN105710620A (en) | 2016-03-30 | 2016-03-30 | Manufacturing process for conjunction-tooth gear of car transmission |
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| CN105710620A true CN105710620A (en) | 2016-06-29 |
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| CN201610191244.1A Pending CN105710620A (en) | 2016-03-30 | 2016-03-30 | Manufacturing process for conjunction-tooth gear of car transmission |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105945540A (en) * | 2016-07-13 | 2016-09-21 | 重庆创精温锻成型有限公司 | Combined gear ring manufacturing method of hybrid new energy vehicle transmission |
| CN106825345A (en) * | 2017-02-16 | 2017-06-13 | 上海汽车变速器有限公司 | The implementation method of the monoblock type combination gear based on enclosed warm forging |
| CN106862395A (en) * | 2017-04-28 | 2017-06-20 | 重庆创精温锻成型有限公司 | Deep slot type conjunction gear composite forming die |
| CN107096866A (en) * | 2017-04-28 | 2017-08-29 | 重庆创精温锻成型有限公司 | Hybrid vehicle automatic transmission deep slot type conjunction gear preparation method |
| CN108188673A (en) * | 2018-02-06 | 2018-06-22 | 山东金马工业集团股份有限公司 | A kind of gear member forging technology for improving product qualification rate |
| CN108274207A (en) * | 2017-12-29 | 2018-07-13 | 太仓久进汽车零部件有限公司 | A kind of automobile DCT speed changers input outer shaft cold forging base forming technology |
| CN113478188A (en) * | 2021-07-28 | 2021-10-08 | 重庆创精温锻成型有限公司 | Parking gear tooth profile lateral extrusion forming method |
| CN115945625A (en) * | 2022-12-30 | 2023-04-11 | 江苏创一精锻有限公司 | Forging forming process of differential shell cover |
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| CN104476146A (en) * | 2014-10-30 | 2015-04-01 | 江苏威鹰机械有限公司 | Production process of automotive middle-rear axle transmission meshing sleeve |
| CN104589005A (en) * | 2015-01-15 | 2015-05-06 | 四川众友机械有限责任公司 | Molding process for straight bevel gear |
| CN104858621A (en) * | 2015-05-20 | 2015-08-26 | 江苏太平洋精锻科技股份有限公司 | Input shaft sleeve precision forging method |
| CN105127345A (en) * | 2015-09-30 | 2015-12-09 | 江苏威鹰机械有限公司 | Production method of saloon car transmission combination gear ring |
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| GB8315917D0 (en) * | 1982-06-15 | 1983-07-13 | Nissan Motor | Manufacturing variable ratio steering gear racks |
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| CN103157759A (en) * | 2011-12-09 | 2013-06-19 | 江苏威鹰机械有限公司 | Cylindrical gear warm-cold combined precision forging plastic molding process |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105945540A (en) * | 2016-07-13 | 2016-09-21 | 重庆创精温锻成型有限公司 | Combined gear ring manufacturing method of hybrid new energy vehicle transmission |
| CN106825345A (en) * | 2017-02-16 | 2017-06-13 | 上海汽车变速器有限公司 | The implementation method of the monoblock type combination gear based on enclosed warm forging |
| CN106825345B (en) * | 2017-02-16 | 2019-06-28 | 上海汽车变速器有限公司 | The implementation method of monoblock type combination gear based on enclosed warm forging |
| CN106862395A (en) * | 2017-04-28 | 2017-06-20 | 重庆创精温锻成型有限公司 | Deep slot type conjunction gear composite forming die |
| CN107096866A (en) * | 2017-04-28 | 2017-08-29 | 重庆创精温锻成型有限公司 | Hybrid vehicle automatic transmission deep slot type conjunction gear preparation method |
| CN108274207A (en) * | 2017-12-29 | 2018-07-13 | 太仓久进汽车零部件有限公司 | A kind of automobile DCT speed changers input outer shaft cold forging base forming technology |
| CN108188673A (en) * | 2018-02-06 | 2018-06-22 | 山东金马工业集团股份有限公司 | A kind of gear member forging technology for improving product qualification rate |
| CN113478188A (en) * | 2021-07-28 | 2021-10-08 | 重庆创精温锻成型有限公司 | Parking gear tooth profile lateral extrusion forming method |
| CN113478188B (en) * | 2021-07-28 | 2022-07-29 | 重庆创精温锻成型有限公司 | Parking gear tooth profile lateral extrusion forming method |
| CN115945625A (en) * | 2022-12-30 | 2023-04-11 | 江苏创一精锻有限公司 | Forging forming process of differential shell cover |
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