CN102494106A - Process for manufacturing 20 CrMo carburizing steel gear - Google Patents
Process for manufacturing 20 CrMo carburizing steel gear Download PDFInfo
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- CN102494106A CN102494106A CN2011104413156A CN201110441315A CN102494106A CN 102494106 A CN102494106 A CN 102494106A CN 2011104413156 A CN2011104413156 A CN 2011104413156A CN 201110441315 A CN201110441315 A CN 201110441315A CN 102494106 A CN102494106 A CN 102494106A
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Abstract
The invention discloses a process for manufacturing a 20 CrMo carburizing steel gear. The process comprises the following steps of: forging blanks, normalizing, machining, performing slack annealing, machining, carburizing and quenching, tempering and throwing balls, wherein the slack annealing process comprises the following steps of: keeping the temperature at the temperature of Ac1+(30-50)DEG C under the protection of atmosphere for 2 hours, and cooling to the temperature of between 700 and 720 DEG C with a furnace for air cooling. By the process for manufacturing the 20 CrMo carburizing steel gear, the internal stress of workpieces can be eliminated completely, and crystal phase tissue structures of the workpieces also can be improved, so that the matrix tissue of the workpieces is more uniform, the deformation of the workpieces in the subsequent carburizing and quenching process is smaller, and the machining accuracy of the workpieces is ensured.
Description
Technical field
The present invention relates to a kind of Gear Processing technology, concrete is a kind of gear preparation process that adopts 20CrMo steel for carburizing to make gear.
Background technique
Motorcycle-gear generally adopts the 20CrMo steel to do, and adopting the 20CrMo steel to make in the cold working process of gear, in order to eliminate inner stress of work, reduces the distortion of workpiece and prevents the workpiece cracking, adopts 500 ~ 600 ℃ stress relief annealing to handle usually.Can remove inner stress of work to a certain extent though adopt this stress relief annealing technology; But inner stress of work is removed and is incomplete; Matrix is also even inadequately, causes the amount of deformation of workpiece in the follow-up carburizing quenching process of Machining of Gear wayward, and sex change is bigger.
Given this; The present invention proposes a kind of preparation process of 20CrMo steel for carburizing gear; The preparation process of this 20CrMo steel for carburizing gear not only can be eliminated inner stress of work more up hill and dale, and can improve the crystalline phase Organizational Structure of workpiece, and it is more even to make workpiece substrate organize; Amount of deformation in follow-up carburizing and quenching operation is littler, guarantees the machining accuracy of workpiece.
Summary of the invention
The technical problem that the present invention will solve is the preparation process that proposes a kind of 20CrMo steel for carburizing gear; The preparation process of this 20CrMo steel for carburizing gear not only can be eliminated inner stress of work more up hill and dale; And can improve the crystalline phase Organizational Structure of workpiece; It is more even to make workpiece substrate organize, and the amount of deformation in follow-up carburizing and quenching operation is littler, guarantees the machining accuracy of workpiece.
Realize above-mentioned technical purpose; The preparation process of 20CrMo steel for carburizing gear of the present invention; Comprise following operation: forging stock → normalizing → machining → partial annealing → machining → carburizing and quenching → tempering → ball blast, wherein partial annealing technology is under the protection of atmosphere, at Ac
1+ (30-50) ℃ temperature conditions insulation 2 hours down, and air cooling after cooling to 700 ~ 720 ℃ with the furnace.
Further, said shielding gas atmosphere is a methanol gas.
Beneficial effect of the present invention is:
The preparation process of 20CrMo steel for carburizing gear of the present invention is because the heating-up temperature of partial annealing operation is the Ac of 20CrMo steel
1+ (30-50) ℃, can make the crystalline phase tissue part austenitizing of 20CrMo steel for carburizing, in process air cooler subsequently, structural transformation is fine pearlite and ferrite, has eliminated the stress that produces in the cold working process effectively; Simultaneously, since tissue part's austenitizing, the general relatively stress relief annealing of not organizing variation, and destressing is effective, and matrix is more even, follow-up carburizing and quenching heat treatment deformation more easy to control;
Therefore; The preparation process of 20CrMo steel for carburizing gear of the present invention not only can be eliminated inner stress of work more up hill and dale, and can improve the crystalline phase Organizational Structure of workpiece, and it is more even to make workpiece substrate organize; Amount of deformation in follow-up carburizing and quenching operation is littler, guarantees the machining accuracy of workpiece.
Embodiment
Following specific embodiments of the invention elaborates.
The preparation process of 20CrMo steel for carburizing gear of the present invention comprises following operation: forging stock → normalizing → machining → partial annealing → machining → carburizing and quenching → tempering → ball blast, wherein partial annealing technology is under the atmosphere protection of methanol gas, at Ac
1+ (30-50) ℃ temperature conditions insulation 2 hours down, and air cooling after cooling to 700 ~ 720 ℃ with the furnace.Other operations of the preparation process of 20CrMo steel for carburizing gear of the present invention are identical with existing technology, tired no longer one by one stating.
The preparation process of 20CrMo steel for carburizing gear of the present invention is because the heating-up temperature of partial annealing operation is the Ac of 20CrMo steel
1+ (30-50) ℃; The critical temperature Ac1 of 20CrMo steel is 743 ℃, can make the crystalline phase tissue part austenitizing of 20CrMo steel for carburizing, in process air cooler subsequently; Structural transformation is fine pearlite and ferrite, has eliminated the stress that produces in the cold working process effectively; Simultaneously, since tissue part's austenitizing, the general relatively stress relief annealing of not organizing variation, and destressing is effective, and matrix is more even, follow-up carburizing and quenching heat treatment deformation more easy to control; Therefore; The preparation process of 20CrMo steel for carburizing gear of the present invention not only can be eliminated inner stress of work more up hill and dale, and can improve the crystalline phase Organizational Structure of workpiece, and it is more even to make workpiece substrate organize; Amount of deformation in follow-up carburizing and quenching operation is littler, guarantees the machining accuracy of workpiece.
First embodiment
The preparation process of present embodiment 20CrMo steel for carburizing gear; Comprise following operation: forging stock → normalizing → machining → partial annealing → machining → carburizing and quenching → tempering → ball blast; Wherein partial annealing technology is under the atmosphere protection of methanol gas; Insulation is 2 hours under 780 ℃ temperature conditions, and air cooling after cooling to 720 ℃ with the furnace.Other operations of the preparation process of present embodiment 20CrMo steel for carburizing gear are identical with existing technology, tired no longer one by one stating.
The preparation process of present embodiment 20CrMo steel for carburizing gear is because the heating-up temperature of partial annealing operation is 780 ℃, and this temperature drops on the Ac of 20CrMo steel
1+ (30-50) ℃ between, can make the crystalline phase tissue part austenitizing of 20CrMo steel for carburizing, in process air cooler subsequently, structural transformation is fine pearlite and ferrite, has eliminated the stress that produces in the cold working process effectively.Simultaneously, since tissue part's austenitizing, the general relatively stress relief annealing of not organizing variation, and destressing is effective, and matrix is more even, follow-up carburizing and quenching heat treatment deformation more easy to control.Therefore; The preparation process of 20CrMo steel for carburizing gear of the present invention not only can be eliminated inner stress of work more up hill and dale, and can improve the crystalline phase Organizational Structure of workpiece, and it is more even to make workpiece substrate organize; Amount of deformation in follow-up carburizing and quenching operation is littler, guarantees the machining accuracy of workpiece.
Second embodiment
The preparation process of present embodiment 20CrMo steel for carburizing gear; Comprise following operation: forging stock → normalizing → machining → partial annealing → machining → carburizing and quenching → tempering → ball blast; Wherein partial annealing technology is under the atmosphere protection of methanol gas; Insulation is 2 hours under 775 ℃ temperature conditions, and air cooling after cooling to 700 ℃ with the furnace.Other operations of the preparation process of present embodiment 20CrMo steel for carburizing gear are identical with existing technology, tired no longer one by one stating.
The preparation process of present embodiment 20CrMo steel for carburizing gear is because the heating-up temperature of partial annealing operation is 775 ℃, and this temperature drops on the Ac of 20CrMo steel
1+ (30-50) ℃ between, can make the crystalline phase tissue part austenitizing of 20CrMo steel for carburizing, in process air cooler subsequently, structural transformation is fine pearlite and ferrite, has eliminated the stress that produces in the cold working process effectively.Simultaneously, since tissue part's austenitizing, the general relatively stress relief annealing of not organizing variation, and destressing is effective, and matrix is more even, follow-up carburizing and quenching heat treatment deformation more easy to control.Therefore; The preparation process of 20CrMo steel for carburizing gear of the present invention not only can be eliminated inner stress of work more up hill and dale, and can improve the crystalline phase Organizational Structure of workpiece, and it is more even to make workpiece substrate organize; Amount of deformation in follow-up carburizing and quenching operation is littler, guarantees the machining accuracy of workpiece.
The 3rd embodiment
The preparation process of present embodiment 20CrMo steel for carburizing gear; Comprise following operation: forging stock → normalizing → machining → partial annealing → machining → carburizing and quenching → tempering → ball blast; Wherein partial annealing technology is under the atmosphere protection of methanol gas; Insulation is 2 hours under 790 ℃ temperature conditions, and air cooling after cooling to 710 ℃ with the furnace.Other operations of the preparation process of present embodiment 20CrMo steel for carburizing gear are identical with existing technology, tired no longer one by one stating.
The preparation process of present embodiment 20CrMo steel for carburizing gear is because the heating-up temperature of partial annealing operation is 790 ℃, and this temperature drops on the Ac of 20CrMo steel
1+ (30-50) ℃ between, can make the crystalline phase tissue part austenitizing of 20CrMo steel for carburizing, in process air cooler subsequently, structural transformation is fine pearlite and ferrite, has eliminated the stress that produces in the cold working process effectively.Simultaneously, since tissue part's austenitizing, the general relatively stress relief annealing of not organizing variation, and destressing is effective, and matrix is more even, follow-up carburizing and quenching heat treatment deformation more easy to control.Therefore; The preparation process of 20CrMo steel for carburizing gear of the present invention not only can be eliminated inner stress of work more up hill and dale, and can improve the crystalline phase Organizational Structure of workpiece, and it is more even to make workpiece substrate organize; Amount of deformation in follow-up carburizing and quenching operation is littler, guarantees the machining accuracy of workpiece.
Explanation is at last; Above embodiment is only unrestricted in order to technological scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technological scheme of the present invention; And not breaking away from the aim and the scope of technological scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. the preparation process of a 20CrMo steel for carburizing gear, it is characterized in that: comprise following operation: forging stock → normalizing → machining → partial annealing → machining → carburizing and quenching → tempering → ball blast, wherein partial annealing technology is under the protection of atmosphere, at Ac
1+ (30-50) ℃ temperature conditions insulation 2 hours down, and air cooling after cooling to 700 ~ 720 ℃ with the furnace.
2. according to the preparation process of the said 20CrMo steel for carburizing of claim 1 gear, it is characterized in that: said shielding gas atmosphere is a methanol gas.
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| CN2011104413156A CN102494106A (en) | 2011-12-26 | 2011-12-26 | Process for manufacturing 20 CrMo carburizing steel gear |
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| CN2011104413156A CN102494106A (en) | 2011-12-26 | 2011-12-26 | Process for manufacturing 20 CrMo carburizing steel gear |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979884A (en) * | 2012-11-23 | 2013-03-20 | 无锡威孚中意齿轮有限责任公司 | Mine vehicle axle wheel reductor planetary gear and manufacture method thereof |
| CN103233106A (en) * | 2012-11-02 | 2013-08-07 | 重庆长风机器有限责任公司 | Steel heat treatment deformation treatment method |
| CN104070328A (en) * | 2014-06-26 | 2014-10-01 | 无锡市崇安区科技创业服务中心 | Mining roller bit steel-tooth cone manufacturing process |
| CN105436840A (en) * | 2014-08-07 | 2016-03-30 | 豫北转向系统股份有限公司 | Surface treatment process of power steering gear wheel |
| CN106702127A (en) * | 2015-08-24 | 2017-05-24 | 贺挺 | Heat treatment process for tooth ring |
| CN107052729A (en) * | 2017-04-17 | 2017-08-18 | 常州机电职业技术学院 | Method for machining gear |
| CN107400765A (en) * | 2017-07-07 | 2017-11-28 | 湖北鸣利来冶金机械股份有限公司 | The non-metallic inclusion high temperature passivation Technology for Heating Processing of palm of roller bits blank |
| CN108384936A (en) * | 2018-02-13 | 2018-08-10 | 无锡宏达重工股份有限公司 | A kind of processing technology of wind turbine gearbox carburizing steel heat treatment after forging |
| CN114921638A (en) * | 2022-05-06 | 2022-08-19 | 北京机电研究所有限公司 | Accurate heat treatment method for low-carbon low-alloy high-strength thin steel plate |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233106A (en) * | 2012-11-02 | 2013-08-07 | 重庆长风机器有限责任公司 | Steel heat treatment deformation treatment method |
| CN103233106B (en) * | 2012-11-02 | 2014-08-06 | 重庆长风机器有限责任公司 | Steel heat treatment deformation treatment method |
| CN102979884A (en) * | 2012-11-23 | 2013-03-20 | 无锡威孚中意齿轮有限责任公司 | Mine vehicle axle wheel reductor planetary gear and manufacture method thereof |
| CN102979884B (en) * | 2012-11-23 | 2015-04-29 | 无锡威孚中意齿轮有限责任公司 | Manufacturing method for mine vehicle axle wheel reductor planetary gear |
| CN104070328A (en) * | 2014-06-26 | 2014-10-01 | 无锡市崇安区科技创业服务中心 | Mining roller bit steel-tooth cone manufacturing process |
| CN105436840A (en) * | 2014-08-07 | 2016-03-30 | 豫北转向系统股份有限公司 | Surface treatment process of power steering gear wheel |
| CN106702127A (en) * | 2015-08-24 | 2017-05-24 | 贺挺 | Heat treatment process for tooth ring |
| CN107052729A (en) * | 2017-04-17 | 2017-08-18 | 常州机电职业技术学院 | Method for machining gear |
| CN107400765A (en) * | 2017-07-07 | 2017-11-28 | 湖北鸣利来冶金机械股份有限公司 | The non-metallic inclusion high temperature passivation Technology for Heating Processing of palm of roller bits blank |
| CN108384936A (en) * | 2018-02-13 | 2018-08-10 | 无锡宏达重工股份有限公司 | A kind of processing technology of wind turbine gearbox carburizing steel heat treatment after forging |
| CN114921638A (en) * | 2022-05-06 | 2022-08-19 | 北京机电研究所有限公司 | Accurate heat treatment method for low-carbon low-alloy high-strength thin steel plate |
| CN114921638B (en) * | 2022-05-06 | 2023-11-03 | 中国机械总院集团北京机电研究所有限公司 | Accurate heat treatment method for low-carbon low-alloy high-strength thin steel plate |
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Application publication date: 20120613 |