CN103084812A - 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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- CN103084812A CN103084812A CN2013100634820A CN201310063482A CN103084812A CN 103084812 A CN103084812 A CN 103084812A CN 2013100634820 A CN2013100634820 A CN 2013100634820A CN 201310063482 A CN201310063482 A CN 201310063482A CN 103084812 A CN103084812 A CN 103084812A
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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 gears 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 of 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 processing of long period and obtain.The method of this kind machining, efficient own is lower, especially adopts lathe to carry out time of gear hobbing, Gear Milling long, has increased its manufacturing cost; And precision is not too high, has reduced security and life-span, increases noise, has also reduced the interchangeability of gear.Development along with the hot forging technology, travelling gear with automotive power transmission system has also appearred after being heated to uniform temperature, compressing forming method in forge die, this kind method need to heat workpiece (blank), expend certain energy, and at high temperature compacting, larger variation has occured in the metallographic structure of inside workpiece, need the heat treatment of higher standard could satisfy the requirement of mechanical performance, could use as the system of vehicle transmission parts; The preparation method of this hot forging has increased the production process of gear, has improved the percent defective of part, the corresponding cost of manufacture that increases gear; And the energy that expends 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 make and process, the raw metal that the time of existing gear hobbing, gear shaping, Gear Milling is long, precision is not too high, consume is many, percent defective part is high, increased the deficiency such as manufacturing cost, provides that a kind of dimensional accuracy is high, oxidation is few, shortens manufacturing time, reduces the percent defective of part, the automobile wheel edge planetary gear cold extrusion forming preparation method of reduction 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 the material section, remove undesirable material section through check; Can be through the centreless grinding grinding skin, checking cracks through flaw detection is removed undesirable material section; With qualified material section, spraying lubricant, oven dry lubricant;
(2) heat treatment of once annealing: the section of expecting is heated to 830 ℃ ~ 870 ℃, is incubated 8-14 hour, drop to 680 ℃
+Be cooled to 350 ℃ of left and right with stove after 15 ℃, then the air cooling of coming out of the stove is to room temperature;
(3) section of expecting is carried out Shot Blasting, then carry out phosphatization saponification for the first time and process;
(4) carry out cold extrusion on hydraulic press expecting that section is placed on, obtain discoid blank;
(5) according to technological requirement, with the punching on stamping machine of discoid blank, obtain having the blank of centre bore;
(6) double annealing heat treatment: with blank heating to 830 ℃ ~ 870 ℃, be incubated 8-14 hour, drop to 680 ℃
+Be cooled to 350 ℃ of left and right with stove after 15 ℃, then the air cooling of coming out of the stove is to room temperature;
(7) blank is carried out phosphatization and saponification for the second time;
(8) again blank is arranged on and carries out cold extrusion shapedly on hydraulic press, 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 with respect to prior art, has following features:
1, adopt the cold-stamped method to forge discoid blank and tooth-formation of gear, higher than forge hot dimensional accuracy, oxidation is few, and organize the metal inherence, and crystal grain is refinement more, avoids the harmful structures such as coarse-grain, mixed crystal.
2, can shorten manufacturing time, 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, raw material material section is annealed after heat treatment for the first time, carry out cold extrusion and obtain discoid blank, and punching on stamping machine, obtain having the blank of centre bore; Then, carry out again after the heat treatment of annealing for the second time cold extrusion shaped, can effectively eliminate the material intersegmental part stress, significantly improve cold extrusion shaped back-geared every mechanical performance index.
Description of drawings
Fig. 1 is the structural representation of automobile wheel edge planetary gear of the present invention.
The specific embodiment
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 (the alloy carbon steel that meets technological requirement is as 20CrMoH or 20CrMnTiH) are cut into the material section, through centreless grinding grinding skin, checking cracks through flaw detection; With qualified material section, spraying lubricant, oven dry lubricant;
(2) heat treatment of annealing for the first time: the section of expecting is heated to 830 ℃ ~ 870 ℃, is incubated 8-14 hour, drop to 680 ℃
+Be cooled to 350 ℃ of left and right with stove after 15 ℃, then the air cooling of coming out of the stove is to room temperature; Can be in heater, as heating in main frequency furnace, intermediate frequency furnace etc.;
(3) section of expecting is carried out Shot Blasting, then carry out phosphatization saponification for the first time and process; Shot Blasting is generally to carry out in shot-blasting machine (existing shot-blast apparatus), and phosphatization saponification processing is a kind of conventional treatment to steel;
(4) carry out cold extrusion on hydraulic press expecting that section is placed on, obtain discoid blank;
(5) according to technological requirement, with the punching on stamping machine of discoid blank, obtain having the blank of centre bore; If in centre bore during also with structures such as keyway, teeth groove, can one-shot forming when rushing centre bore, once just can obtain;
(6) double annealing heat treatment: with blank heating to 830 ℃ ~ 870 ℃, be incubated 8-14 hour, drop to 680 ℃
+Be cooled to 350 ℃ of left and right with stove after 15 ℃, then the air cooling of coming out of the stove is to room temperature;
(7) blank is carried out phosphatization and saponification processing for the second time;
(8) again blank is arranged on and carries out cold extrusion shapedly on hydraulic press, 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 commonly used is 20CrMoH or 20CrMnTiH etc., after the production engineering specifications blanking, at first grinding are carried out on its surface and are processed with the defect-detecting equipment inspection, whether crackle etc. is arranged again, and are defective if any being judged to; Then at its surface spraying lubricant of certified products, lubricant commonly used is that graphite or organic polymer are lubricated
Agent, lubricate.
When heating, can carry out in protective atmosphere; Described protective atmosphere is to add nitrogen or the inert gas with protective effect in Medium Frequency Induction Heating Furnace, prevent blank in heating process by severe oxidation, the product surface roughness of forging molding is good like this, the skin decarburization phenomenon is very little.The temperature that heats in Medium Frequency Induction Heating Furnace can be chosen 830 ℃, 835 ℃, 840 ℃, 845 ℃, 850 ℃, 855 ℃, 860 ℃, 865 ℃, 870 ℃ etc.
The annealing heat treatment of process of the present invention at first to the material section, for the second time to blank, can effectively be eliminated the stress of material section, blank, improves its interior tissue, significantly improves its mechanical property.
According to technological requirement, choose suitable hydraulic press, blank is carried out cold extrusion process, make the tooth-formation of gear moulding, 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 processing etc. are all existing apparatus or prior art; During operation, according to the technique needs, make suitable mould etc., operation, just can obtain intermediate of the present invention or final finished as requested.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope 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 the material section, through centreless grinding grinding skin, checking cracks through flaw detection; With qualified material section, spraying lubricant, oven dry lubricant;
(2) heat treatment of annealing for the first time: the section of expecting is heated to 830 ℃ ~ 870 ℃, is incubated 8-14 hour, drop to 680 ℃
+Be cooled to 350 ℃ with stove after 15 ℃
+10 ℃, then the air cooling of coming out of the stove is to room temperature;
(3) section of expecting is carried out Shot Blasting, then carry out phosphatization saponification for the first time and process; Shot Blasting is to carry out in shot-blasting machine;
(4) carry out cold extrusion on hydraulic press expecting that section is placed on, obtain discoid blank;
(5) according to technological requirement, with the punching on stamping machine of discoid blank, obtain having the blank of centre bore;
(6) double annealing heat treatment: with blank heating to 830 ℃ ~ 870 ℃, be incubated 8-14 hour, drop to 680 ℃
+Be cooled to 350 ℃ with stove after 15 ℃
+10 ℃, then the air cooling of coming out of the stove is to room temperature;
(7) blank is carried out phosphatization and saponification processing for the second time;
(8) again blank is arranged on and carries out cold extrusion shapedly on hydraulic press, obtain having the gear of profile of tooth of meeting the requirements.
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| 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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| 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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| CN103084812B CN103084812B (en) | 2015-06-24 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105537871A (en) * | 2015-12-23 | 2016-05-04 | 南京信昌塑胶电子有限公司 | Manufacturing method for washing machine drum bearing blocks |
| CN106623744A (en) * | 2016-12-29 | 2017-05-10 | 兴化市鑫翔机械有限公司 | Cold-temperature extrusion preparation technology of 31-tooth sliding engaging sleeve engaging teeth |
| 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 |
| CN108284304A (en) * | 2017-12-27 | 2018-07-17 | 杭州新世纪万向节有限公司 | Universal-joint cross trunnion blank cold-extruded processing technology |
| CN112122376A (en) * | 2020-09-11 | 2020-12-25 | 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105537871A (en) * | 2015-12-23 | 2016-05-04 | 南京信昌塑胶电子有限公司 | Manufacturing method for washing machine drum bearing blocks |
| 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 |
| CN106623744A (en) * | 2016-12-29 | 2017-05-10 | 兴化市鑫翔机械有限公司 | Cold-temperature extrusion preparation technology of 31-tooth sliding engaging sleeve engaging teeth |
| 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 |
| CN108284304A (en) * | 2017-12-27 | 2018-07-17 | 杭州新世纪万向节有限公司 | Universal-joint cross trunnion blank cold-extruded processing 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 |
| CN112122376A (en) * | 2020-09-11 | 2020-12-25 | 河北海航管道制造有限公司 | Cold extrusion process for manufacturing seamless oblique steel tee |
| 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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