CN103084812B - Cold extrusion molding manufacture method for planet wheel at side of automobile wheel - Google Patents
Cold extrusion molding manufacture method for planet wheel at side of automobile wheel Download PDFInfo
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- CN103084812B CN103084812B CN201310063482.0A CN201310063482A CN103084812B CN 103084812 B CN103084812 B CN 103084812B CN 201310063482 A CN201310063482 A CN 201310063482A CN 103084812 B CN103084812 B CN 103084812B
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Abstract
The invention discloses a cold extrusion molding manufacture method for a planet wheel at the side of an automobile wheel. The method comprises the following steps: cutting raw materials into materials segments, after the surfaces are grinded, spraying the qualified material segments with lubricating agent; conducting a shot blasting treatment and a phosphating and saponification treatment after a first annealing heat treatment; punching a centre hole after cold extrusion on a hydraulic machine, conducting the annealing heat treatment again, and conducting the second phosphating and saponification treatment; conducting cold extrusion molding on the blank best, so that a gear with a tooth form meeting the requirement is gained. According to the cold extrusion molding manufacture method for the planet wheel at the side of the automobile wheel, the disc-shaped blank and the tooth of the gear forged by means of a cold extrusion method is higher in size precision, less in oxidation, better in metal internal structure, more refined in crystal grains and free of the bad organization such as coarse grains and mixed grains compared with that forged by means of a got forging. The manufacture time is shortened, the rejection rate of parts is reduced and manufacture cost is reduced. Due to the fact that the deformation amount of a tooth shape formed by cold extrusion is smaller, the tooth shape precision can be reached more easily and the size is stable. The service life of the mould is very long.
Description
Technical field
The present invention relates to a kind of preparation method of automotive power transmission system gear, especially the cold extrusion shaped preparation method of the spur gear such as automobile wheel edge planetary gear, sun gear.
Background technology
Automobile wheel edge planetary gear, sun gear are very important parts in automotive power transmission system, starting power transmission and chronotropic action, and its quality making quality is directly connected to safety and the life-span of automobile.In prior art, the spur gears such as automobile wheel edge planetary gear, sun gear adopt the method for machining usually, with lathe gear hobbing, shaving etc. through the long period processing and obtain.The method of this kind of machining, efficiency own is lower, especially adopt lathe carry out gear hobbing, Gear Milling time long, increase its manufacturing cost; And precision is not too high, reduce security and life-span, increase noise, also reduce the interchangeability of gear.Along with the development of hot forging technology, also occurred the travelling gear of automotive power transmission system after being heated to uniform temperature, forming method compressing in forge die, this kind of method needs to heat workpiece (blank), expend certain energy, and at high temperature suppress, the metallographic structure of inside workpiece there occurs larger change, need the heat treatment of higher standard could meet the requirement of mechanical performance, could use as system of vehicle transmission parts; The preparation method of this hot forging, adds the production process of gear, improves the percent defective of part, the corresponding cost of manufacture increasing gear; And the energy expended is also more.
Summary of the invention
The automobile straight gear that the present invention is directed to prior art mainly adopts the mode of machining to carry out manufacturing and processing, the time of existing gear hobbing, gear shaping, Gear Milling is long, precision is not too high, the raw metal percent defective that is many, part of consumption is high, increase the deficiencies such as manufacturing cost, provides the automobile wheel edge planetary gear cold extrusion forming preparation method that a kind of dimensional accuracy is high, be oxidized less, shorten manufacturing time, reduce the percent defective of part, reduce manufacturing cost.
Technical scheme of the present invention: automobile wheel edge planetary gear cold extrusion forming preparation method, the steps include:
(1) according to technological requirement, raw material are sawn into material section, remove undesirable material section through inspection; Can through centreless grinding grinding skin, checking cracks through flaw detection, removes undesirable material section; By qualified material section, spraying lubricant, dries lubricant;
(2) once to anneal heat treatment: material section is heated to 830 DEG C ~ 870 DEG C, insulation 8-14 hour, drops to 680 DEG C
+350 DEG C are cooled to stove after 15 DEG C
+10 DEG C, then air cooling of coming out of the stove is to room temperature;
(3) material section is carried out Shot Blasting, then carry out first time phosphatization saponification process;
(4) carrying out cold extrusion expecting that section is placed on hydraulic press, obtaining discoid blank;
(5) according to technological requirement, by the punching on stamping machine of discoid blank, the blank with centre bore is obtained;
(6) double annealing heat treatment: by blank heating to 830 DEG C ~ 870 DEG C, insulation 8-14 hour, drops to 680 DEG C
+350 DEG C are cooled to stove after 15 DEG C
+10 DEG C, then air cooling of coming out of the stove is to room temperature;
(7) second time phosphatization and saponification are carried out to blank;
(8) again blank is arranged on and hydraulic press carries out cold extrusion shaped, obtain having the gear of profile of tooth of meeting the requirements.
Automobile wheel edge planetary gear cold extrusion forming preparation method of the present invention, relative to prior art, has following features:
1, adopt cold-stamped method to forge discoid blank and tooth-formation of gear, higher than forge hot dimensional accuracy, oxidation is few, and metal inherence is organized, and crystal grain is refinement more, avoids the harmful structure such as coarse-grain, mixed crystal.
2, can manufacturing time be shortened, reduce the percent defective of part, reduce manufacturing cost.
3, cold extrusion profile of tooth, the deflection of profile of tooth is little, so more easily reaches profile accuracy, dimensionally stable; Die life is very high.
4, after first time annealing heat treatment being carried out to raw material material section, carry out cold extrusion and obtain discoid blank, and punching on stamping machine, obtain the blank with centre bore; Then, carry out cold extrusion shaped after second time annealing heat treatment again, effectively can eliminate the stress of material intersegmental part, significantly improve cold extrusion shaped back-geared every mechanical performance index.
Accompanying drawing explanation
Fig. 1 is the structural representation of automobile wheel edge planetary gear of the present invention.
Detailed description of the invention
Automobile wheel edge planetary gear cold extrusion forming preparation method of the present invention, is characterized in that comprising the steps:
(1) according to production engineering specifications, raw material (meeting the alloy carbon steel of technological requirement, as 20CrMoH or 20CrMnTiH) are cut into material section, through centreless grinding grinding skin, checking cracks through flaw detection; By qualified material section, spraying lubricant, dries lubricant;
(2) first time anneals heat treatment: material section is heated to 830 DEG C ~ 870 DEG C, is incubated 8-14 hour, drops to 680 DEG C
+be cooled to about 350 DEG C with stove after 15 DEG C, then air cooling of coming out of the stove is to room temperature; Can in heater, as heated in main frequency furnace, intermediate frequency furnace etc.;
(3) material section is carried out Shot Blasting, then carry out first time phosphatization saponification process; Shot Blasting is generally carry out in shot-blasting machine (existing shot-blast apparatus), and phosphatization saponification process is a kind of conventional treatment to steel;
(4) carrying out cold extrusion expecting that section is placed on hydraulic press, obtaining discoid blank;
(5) according to technological requirement, by the punching on stamping machine of discoid blank, the blank with centre bore is obtained; If time in centre bore also with the structure such as keyway, teeth groove, can the one-shot forming when rushing centre bore, once just can obtain;
(6) double annealing heat treatment: by blank heating to 830 DEG C ~ 870 DEG C, insulation 8-14 hour, drops to 680 DEG C
+be cooled to about 350 DEG C with stove after 15 DEG C, then air cooling of coming out of the stove is to room temperature;
(7) second time phosphatization and saponification process are carried out to blank;
(8) again blank is arranged on and hydraulic press carries out cold extrusion shaped, obtain having the gear of profile of tooth of meeting the requirements.
The raw material of automobile wheel edge planetary gear are structural alloy steels, and that conventional is 20CrMoH or 20CrMnTiH etc., after production engineering specifications blanking, first carry out grinding process to its surface and have checked whether crackle etc. with defect-detecting equipment again, defective if any being then judged to; Then at its surface spraying lubricant of certified products, conventional lubricant is graphite or organic polymer lubrication
Agent, lubricate.
when heating, can carry out in protective atmosphere; Described protective atmosphere is in Medium Frequency Induction Heating Furnace, add the nitrogen or inert gas with protective effect, prevents blank by severe oxidation in heating process, and the product surface roughness of such forging molding is good, and surface decarburization phenomenon is very little.The temperature heated in Medium Frequency Induction Heating Furnace can choose 830 DEG C, 835 DEG C, 840 DEG C, 845 DEG C, 850 DEG C, 855 DEG C, 860 DEG C, 865 DEG C, 870 DEG C etc.
The annealing heat treatment of process of the present invention, first to material section, second time, to blank, effectively can be eliminated the stress of material section, blank, improve its interior tissue, significantly improve its mechanical property.
According to technological requirement, choose suitable hydraulic press, carry out cold extrusion process to blank, make tooth-formation of gear shaping, the precision of the profile of tooth of acquisition and roughness are all higher, can reach designing requirement.
Centreless grinding of the present invention, defect-detecting equipment, Medium Frequency Induction Heating Furnace, forcing press, shot-blast apparatus, cold extrusion hydraulic press and phosphatization and saponification process etc. are all existing apparatus or prior art; During operation, according to technique needs, make suitable mould etc., operate as requested, just can obtain intermediate of the present invention or final finished.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. automobile wheel edge planetary gear cold extrusion forming preparation method, is characterized in that comprising the steps:
(1) according to production engineering specifications, raw material are cut into material section, through centreless grinding grinding skin, checking cracks through flaw detection; By qualified material section, spraying lubricant, dries lubricant;
(2) first time anneals heat treatment: material section is heated to 830 DEG C ~ 870 DEG C, is incubated 8-14 hour, be cooled to 350 DEG C ± 10 DEG C, then air cooling of coming out of the stove is to room temperature after dropping to 680 DEG C ± 15 DEG C with stove; When heating, in heating furnace, add the nitrogen or inert gas with protective effect;
(3) material section is carried out Shot Blasting, then carry out first time phosphatization saponification process; Shot Blasting carries out in shot-blasting machine;
(4) carrying out cold extrusion expecting that section is placed on hydraulic press, obtaining discoid blank;
(5) according to technological requirement, by the punching on stamping machine of discoid blank, the blank with centre bore is obtained;
(6) double annealing heat treatment: by blank heating to 830 DEG C ~ 870 DEG C, insulation 8-14 hour, be cooled to 350 DEG C ± 10 DEG C, then air cooling of coming out of the stove is to room temperature after dropping to 680 DEG C ± 15 DEG C with stove; When heating, in heating furnace, add the nitrogen or inert gas with protective effect;
(7) second time phosphatization and saponification process are carried out to blank;
(8) again blank is arranged on and hydraulic press carries out cold extrusion shaped, obtain having the gear of profile of tooth of meeting the requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310063482.0A CN103084812B (en) | 2013-02-28 | 2013-02-28 | Cold extrusion molding manufacture method for planet wheel at side of automobile wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310063482.0A CN103084812B (en) | 2013-02-28 | 2013-02-28 | Cold extrusion molding manufacture method for planet wheel at side of automobile wheel |
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| CN103084812A CN103084812A (en) | 2013-05-08 |
| CN103084812B true CN103084812B (en) | 2015-06-24 |
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| CN201310063482.0A Expired - Fee Related CN103084812B (en) | 2013-02-28 | 2013-02-28 | Cold extrusion molding manufacture method for planet wheel at side of automobile wheel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108057992A (en) * | 2017-12-06 | 2018-05-22 | 浙江浙研冷挤压有限公司 | A kind of preparation method of new-energy automobile drive motor shaft |
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| CN105033592A (en) * | 2014-08-14 | 2015-11-11 | 苏州优金金属成型科技有限公司 | Differential planetary gear blank processing technology |
| CN105382507A (en) * | 2015-11-17 | 2016-03-09 | 韶能集团韶关宏大齿轮有限公司 | Removing method for asymmetric stress of cold extrusion cycloidal gear |
| CN105537871B (en) * | 2015-12-23 | 2017-10-10 | 南京信昌塑胶电子有限公司 | A kind of manufacture method of washing machine drum bearing block |
| CN106623744B (en) * | 2016-12-29 | 2018-08-24 | 兴化市鑫翔机械有限公司 | A kind of 31 tooth slidably engages the cold Warm Extrusion preparation process of set engaging tooth |
| CN107214287A (en) * | 2017-07-12 | 2017-09-29 | 安徽凯密克企业管理咨询有限公司 | A kind of automobile gear cold-extrusion technology |
| CN108284304B (en) * | 2017-12-27 | 2019-10-01 | 杭州新世纪万向节有限公司 | Universal-joint cross trunnion blank cold-extruded processing technology |
| CN112122376B (en) * | 2020-09-11 | 2022-05-31 | 河北海航管道制造有限公司 | Cold extrusion process for manufacturing seamless oblique steel tee |
| CN112171188A (en) * | 2020-09-17 | 2021-01-05 | 王颜琦 | Manufacturing process of speed measuring rotor |
| CN114178458A (en) * | 2021-10-25 | 2022-03-15 | 陕西宏远航空锻造有限责任公司 | Closed die forging forming method for pressurizing driving gear forge piece |
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| CN202543261U (en) * | 2012-02-03 | 2012-11-21 | 湘潭市润金新材料有限公司 | Heating furnace with protective gas |
| CN102925637A (en) * | 2012-10-19 | 2013-02-13 | 霍山汇能汽车零部件制造有限公司 | Spheroidizing annealing process of cold-finished and extruded gear blank |
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| CN108057992A (en) * | 2017-12-06 | 2018-05-22 | 浙江浙研冷挤压有限公司 | A kind of preparation method of new-energy automobile drive motor shaft |
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| CN103084812A (en) | 2013-05-08 |
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