CN102618817A - Process for machining parts of automobile gear box by using 20CrMnTi steel - Google Patents
Process for machining parts of automobile gear box by using 20CrMnTi steel Download PDFInfo
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- CN102618817A CN102618817A CN201210086263XA CN201210086263A CN102618817A CN 102618817 A CN102618817 A CN 102618817A CN 201210086263X A CN201210086263X A CN 201210086263XA CN 201210086263 A CN201210086263 A CN 201210086263A CN 102618817 A CN102618817 A CN 102618817A
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Abstract
The invention discloses a process for machining parts of an automobile gear box by using 20CrMnTi steel. The process is characterized by comprising the following steps of forging, carrying out preheat treatment, mechanically machining, carburizing and quenching, and grinding, wherein in a carburizing and quenching process, carburization is carried out at a temperature of 910-930 DEG C and a dripping amount of a carburizer is monitored when the carburization is carried out, so that the carbon potential in a carburizing furnace is controlled within a range from 0.85 to 1.0; the temperature of the carburizing furnace is cooled to a temperature of 830-850 DEG C; a quenching process is executed directly after a material is discharged and pre-cooled, so that the residual austenitic amount is controlled to be less than or equal to 10%; a tempering temperature is raised, wherein the tempering temperature is less than or equal to 250 DEG C; temperature-preservation time in a tempering process is prolonged to ensure the rigidity of a carburizing layer; and finally, shot blasting is carried out to improve pressing stress. With the adoption of the treatment process, no crack occurs in a grinding process and the percent of pass of machined parts reaches 100%.
Description
Technical field
The present invention relates to the complete processing that a kind of metal material processing becomes the automobile gearbox part.
Background technology
Part in the automobile gearbox; Like reverse idler gear axle, spacer sleeve, gear etc., material is the 20CrMnTi steel, and it is complex-shaped, thickness differs greatly greatly; It is the critical part on the automobile; Part to this material is had relatively high expectations, and wherein carburized depth requires between 0.84-1.34, and surface hardness requires at 58-64HRC.The complete processing of parts such as this automotive reverse gear intermediate gear shaft comprises forging, conditioning heat treatment, mechanical workout, carburizing and quenching basically; Steps such as grinding, and most of little factory unconditionally purchases high-grade carburizing and quenching equipment, its carburizing, quenching are all carried out in the pit carburizing furnace of no carbon potential control; By virtue of experience control the carburizing agent amount of splashing into; Reach control carbon potential purpose, often occur radial, network-like crackle during one procedure thickness intersection grinding in the end, and the crackle amount reaches more than 60%.In general: case depth requires dark more, and its crackle tendency is big more.Therefore, the automobile gearbox part qualification rate of production is not high.Crack reason might be in heat treated carburizing and quenching process, to crack, and also might be that grinding process cracks.This is a comparatively complicated problems.But no matter be that the carburizing and quenching process cracks or in grinding process, cracks, its principal element is that residualinternal stress causes.Wherein stress has two kinds, and a kind of is tensile stress, and promptly tensile stress promptly cracks above the breaking resistance of material, and a kind of in addition is stress, improves the generation that stress can prevent crackle.This forged part of 20CrMnTi steel that cracks through after the metallurgical analysis, exists surface carbon concentration too high, horn shape, massive carbide, remained austenite content is arranged greater than 30% situation.Thereby it is the insoluble always problems of those skilled in the art that the stress that how to improve the 20CrMnTi steel is avoided cracking.
Summary of the invention
In view of the deficiency that background technology exists, the technical problem that the present invention will solve provides a kind of can avoiding and cracks, and is processed into the technology of automobile gearbox part with the 20CrMnTi steel.
For this reason, the present invention adopts following technical scheme to realize: as: a kind ofly be processed into the technology of intermediate gear shaft, it is characterized in that having following steps: forging, conditioning heat treatment, mechanical workout, carburizing and quenching with the 20CrMnTi steel; Grinding, wherein, when carburizing and quenching; Under 910～930 centigradetemperatures, carry out carburizing, the amount of splashing into of monitoring carburizing agent during carburizing guarantees that carbon-potential control in the cementing furnace is in the 0.85-1.0 scope; Then cementing furnace is cooled to 830～850 degrees centigrade, direct quenching after the precooling of coming out of the stove is controlled at remained austenite content and is less than or equal to 10%; Improve tempering temperature again; Tempering temperature is not higher than 250 degrees centigrade, and prolongs soaking time, carries out strengthened shot peening at last.
Behind the carburizing and quenching, when bulk, horn shape carbide being arranged, take high temperature normalizing, to eliminate horn shape, massive carbide as if the discovery surface.
In this technology of the present invention, adopt the amount of splashing into of monitoring carburizing agent, control carbon potential and remained austenite content; Can prevent the crackle tendency of 20CrMnTi steel, through after the technology of the present invention, mechanical property and the work-ing life that can effectively improve the 20CrMnTi steel; And technology is simple, has good circulation ratio, and when grinding, just can not crack; After being processed into automobile gearbox part such as reverse idler gear axle, spacer sleeve, qualification rate reaches 100%.
Embodiment
Relevant details of the present invention is described in further detail below again.
Thisly be processed into the technology of automobile gearbox part, have following steps with the 20CrMnTi steel: forging, conditioning heat treatment, mechanical workout, carburizing and quenching, grinding, wherein; During carburizing and quenching, under 910～930 degree celsius temperature, carry out carburizing, present embodiment is selected 920 ± 10 ℃ of carburizings; Be incubated 5-7 hour; The amount of splashing into of monitoring carburizing agent during carburizing makes carbon-potential control in the cementing furnace in the 0.85-1.0 scope, preferably adopts oxygen probe to monitor automatically during monitoring; As can't adopt oxygen probe, adopt the amount of splashing into of manual shift carburizing agent also to be fine; Then cementing furnace is cooled to 830～850 degrees centigrade; The direct quenching after the precooling of coming out of the stove is controlled at remained austenite content and is less than or equal to 10%, behind the carburizing and quenching; The metallographic structure of taking a sample to check; When discovery has horn shape, massive carbide, take high temperature normalizing, eliminate horn shape, massive carbide in advance to remedy.Under the prerequisite that guarantees surface hardness, can improve tempering temperature, tempering temperature is not higher than 250 degrees centigrade, in general; When the piece surface carbon concentration was higher, tempering temperature just can be higher, when the piece surface carbon concentration is low; Tempering temperature is just lower, and tempering temperature is the highest can not to surpass 250 degrees centigrade, prevents that hardness from reducing; Prolong tempering insulation time simultaneously, in traditional technology, soaking time is about 2 hours; The soaking time of present embodiment extended to more than 2 hours in 3 hours, carried out strengthened shot peening at last, improved the piece surface stress.The shot-peening dynamics is big more, and the stress of piece surface is big more.When case depth reaches in limited time, just can not be with the method for high temperature normalizing as remedial measures, with elimination horn shape, massive carbide.Otherwise case depth is ultra dark after the normalizing, and it is big to satisfy case depth technical requirements and tensile stress.At this moment, can strengthen the shot-peening dynamics, increase stress, the tensile stress that produces when offsetting its ground finish.The emery wheel of soft durometer carries out ground finish in when grinding, selecting, and perhaps often repairs emery wheel, and grinding output controlling is between 0.01-0.05.After this technology of process is handled the 20CrMnTi steel, when processing automobile wheel box part, crackle can't occur, its qualification rate reaches 100%.
Claims (2)
1. one kind is processed into the technology of automobile gearbox part with the 20CrMnTi steel, it is characterized in that having following steps: forging, conditioning heat treatment, mechanical workout, carburizing and quenching, grinding, wherein; During carburizing and quenching, under 910～930 degree celsius temperature, carry out carburizing, the amount of splashing into of monitoring carburizing agent during carburizing; Make carbon-potential control in the cementing furnace in the 0.85-1.0 scope, then cementing furnace is cooled to 830～850 degrees centigrade, direct quenching after the precooling of coming out of the stove; Remained austenite content is controlled at is less than or equal to 10%, improve tempering temperature again, tempering temperature is not higher than 250 degrees centigrade; And prolong soaking time to 2～3 hour, carry out strengthened shot peening at last.
2. according to claim 1ly be processed into the technology of automobile gearbox part with the 20CrMnTi steel, it is characterized in that carburizing and quenching after, take high temperature normalizing, to eliminate horn shape, massive carbide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210086263XA CN102618817A (en) | 2012-03-22 | 2012-03-22 | Process for machining parts of automobile gear box by using 20CrMnTi steel |
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| CN201210086263XA CN102618817A (en) | 2012-03-22 | 2012-03-22 | Process for machining parts of automobile gear box by using 20CrMnTi steel |
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| CN102618817A true CN102618817A (en) | 2012-08-01 |
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| CN201210086263XA Pending CN102618817A (en) | 2012-03-22 | 2012-03-22 | Process for machining parts of automobile gear box by using 20CrMnTi steel |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102990290A (en) * | 2012-08-22 | 2013-03-27 | 昌利锻造有限公司 | Processing method of idler shaft |
| CN103464983A (en) * | 2013-09-18 | 2013-12-25 | 江国辉 | Machining process for differential lock gear sleeve |
| CN104120378A (en) * | 2014-07-24 | 2014-10-29 | 成都亨通兆业精密机械有限公司 | Gear production process facilitating gear surface quality |
| CN104117831A (en) * | 2014-07-24 | 2014-10-29 | 成都亨通兆业精密机械有限公司 | Gear production process favorable for improving machining efficiency and preventing component segregation |
| CN104128772A (en) * | 2014-07-24 | 2014-11-05 | 成都亨通兆业精密机械有限公司 | Gear production process facilitating improvement of production efficiency and decrease of segregation degree |
| CN104128775A (en) * | 2014-07-24 | 2014-11-05 | 成都亨通兆业精密机械有限公司 | Gear production process facilitating improvement of production efficiency and product quality |
| CN104128768A (en) * | 2014-07-24 | 2014-11-05 | 成都亨通兆业精密机械有限公司 | Gear production technology facilitating reducing composition segregation in gear thickness |
| CN106148650A (en) * | 2016-07-01 | 2016-11-23 | 兴化东华齿轮有限公司 | A kind of energy saving and environment friendly Technology for Heating Processing |
| CN106148881A (en) * | 2015-05-14 | 2016-11-23 | 孙豌蓁 | Carburized austempered slider for linear slide rails and method for manufacturing same |
| CN110216429A (en) * | 2019-04-30 | 2019-09-10 | 兴化市统一齿轮有限公司 | A kind of automobile gearbox gear and its manufacturing method |
| CN110257757A (en) * | 2019-06-18 | 2019-09-20 | 洛阳轴承研究所有限公司 | High-carbon-chromium bearing steel part and its heat treatment processing method |
| CN111500833A (en) * | 2020-05-21 | 2020-08-07 | 厦门澄志精密科技有限公司 | Heat treatment process for heat-resistant steel casting of valve |
| CN114891981A (en) * | 2022-04-28 | 2022-08-12 | 陕西柴油机重工有限公司 | Process method for controlling marine diesel engine cam to generate cracks |
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| CN101158046A (en) * | 2007-10-26 | 2008-04-09 | 内蒙古第一机械制造（集团）有限公司 | Surface heat-treatment method for middle-load high-accuracy carburization part |
| CN102061480A (en) * | 2010-11-25 | 2011-05-18 | 嘉兴市易嘉机械有限公司 | Carburizing and quenching method for controlling austenite residues on surface of part |
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2012
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| CN101158046A (en) * | 2007-10-26 | 2008-04-09 | 内蒙古第一机械制造（集团）有限公司 | Surface heat-treatment method for middle-load high-accuracy carburization part |
| CN102061480A (en) * | 2010-11-25 | 2011-05-18 | 嘉兴市易嘉机械有限公司 | Carburizing and quenching method for controlling austenite residues on surface of part |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102990290A (en) * | 2012-08-22 | 2013-03-27 | 昌利锻造有限公司 | Processing method of idler shaft |
| CN103464983A (en) * | 2013-09-18 | 2013-12-25 | 江国辉 | Machining process for differential lock gear sleeve |
| CN104128768A (en) * | 2014-07-24 | 2014-11-05 | 成都亨通兆业精密机械有限公司 | Gear production technology facilitating reducing composition segregation in gear thickness |
| CN104117831A (en) * | 2014-07-24 | 2014-10-29 | 成都亨通兆业精密机械有限公司 | Gear production process favorable for improving machining efficiency and preventing component segregation |
| CN104128772A (en) * | 2014-07-24 | 2014-11-05 | 成都亨通兆业精密机械有限公司 | Gear production process facilitating improvement of production efficiency and decrease of segregation degree |
| CN104128775A (en) * | 2014-07-24 | 2014-11-05 | 成都亨通兆业精密机械有限公司 | Gear production process facilitating improvement of production efficiency and product quality |
| CN104120378A (en) * | 2014-07-24 | 2014-10-29 | 成都亨通兆业精密机械有限公司 | Gear production process facilitating gear surface quality |
| CN106148881A (en) * | 2015-05-14 | 2016-11-23 | 孙豌蓁 | Carburized austempered slider for linear slide rails and method for manufacturing same |
| CN106148881B (en) * | 2015-05-14 | 2018-07-27 | 孙豌蓁 | Carburized austempered slider for linear slide rails and method for manufacturing same |
| CN106148650A (en) * | 2016-07-01 | 2016-11-23 | 兴化东华齿轮有限公司 | A kind of energy saving and environment friendly Technology for Heating Processing |
| CN110216429A (en) * | 2019-04-30 | 2019-09-10 | 兴化市统一齿轮有限公司 | A kind of automobile gearbox gear and its manufacturing method |
| CN110257757A (en) * | 2019-06-18 | 2019-09-20 | 洛阳轴承研究所有限公司 | High-carbon-chromium bearing steel part and its heat treatment processing method |
| CN111500833A (en) * | 2020-05-21 | 2020-08-07 | 厦门澄志精密科技有限公司 | Heat treatment process for heat-resistant steel casting of valve |
| CN114891981A (en) * | 2022-04-28 | 2022-08-12 | 陕西柴油机重工有限公司 | Process method for controlling marine diesel engine cam to generate cracks |
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Application publication date: 20120801 |