CN101029398A - Gear carburizing quenching process for heavy-duty automobile - Google Patents
Gear carburizing quenching process for heavy-duty automobile Download PDFInfo
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- CN101029398A CN101029398A CN 200710014003 CN200710014003A CN101029398A CN 101029398 A CN101029398 A CN 101029398A CN 200710014003 CN200710014003 CN 200710014003 CN 200710014003 A CN200710014003 A CN 200710014003A CN 101029398 A CN101029398 A CN 101029398A
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- carburizing
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Abstract
A process for carburizing and quenching gear of heavy-vehicle is carried out by carburizing, diffusing, lowering temperature to Ac1-(30-50)degree, raising temperature to Ac3+(30-50)degree, keeping temperature and quenching. The pearlite and ferrite tissues have excellent homogenizing and diffusion functions, and it has better refining performance, quality and long usage life.
Description
(1) technical field
The present invention relates to a kind of metallic substance thermal treatment process, particularly a kind of gear carburizing quenching process for heavy-duty automobile.
(2) background technology
The heavy-duty car gear can change interior tissue by carburizing and quenching, improves wear resistance, intensity and the safe range of stress of part, gives full play to the potential performance of material.Traditional carburizing quenching process, its process generally are divided into carburizing, spread, drop to quenching temperature Ac
3More than (Ac
3+ (30～50) ℃), insulation, quench 5 stages; Or adopt carburizing diffusion back air cooling reheat to quenching temperature, be incubated, quench; Or adopting Qa technology, these technologies or solved inherent liver mass problem separately or solved product heat treatment deformation problem separately do not solve the inherent liver mass and the external problem on deformation of carburized gears simultaneously.The deficiency of such technology be part behind carburizing and quenching, obtain interior inhomogeneous in metallographic structure, rank is higher even overproof; Irregular control, the often present situation of appearance distortion off technical requirement of being difficult to of external distortion.Cause the gear performance to reduce and early fatigue occurs damaging.
(3) summary of the invention
The present invention is directed to the deficiency of the existing carburization process of heavy-duty car gear, a kind of product inner quality, the irregular distortion tendency of reduction product, strong, reliable and stable gear carburizing quenching process for heavy-duty automobile of controllability of improving is provided.
In order to solve the problems of the technologies described above, the present invention includes the following processing step that carries out successively: carburizing, spread, be cooled to Ac
1-(30～50) ℃, be warming up to Ac
3+ (30～50) ℃ insulation, quenching.
For making workpiece can obtain inner quality and external quality preferably, diffusion temperature is 920 ± 10 ℃, and soaking time is 60-90min, and carburizing uses carburizing agent to be nitrogen-methyl alcohol-propane or Sweet natural gas-RX gas.
Implementation of processes of the present invention can be according to the following steps:
A. work out the carburizing quenching process program according to the workpiece technical requirements by process curve of the present invention.
B. by PVH carbon control instrument system input carburizing quenching process program and numbering.
C. workpiece shove charge.
D. part carburizing and quench treatment are carried out in the carburizing quenching process program number of selected establishment and execution, and the process time in each stage is determined according to the case depth that gear technique requires.
E. the carburizing quenching process program is finished, and sends end signal, and part is come out of the stove.Finish the workpiece carbonization quenching technology.
Beneficial effect of the present invention is: the present invention is cooled to Ac after employing carburizing, the diffusion in the workpiece carbonization quenching process
1Below be Ac
1-(30～50) ℃ are raised to Ac again
3More than be Ac
3+ (30～50) ℃ insulation is quenched then.This technology directly drops to Ac for 920 ± 10 ℃ from carburizing, diffusion temperature
1-(30～50) ℃, because cooling rate is very fast, the workpiece tissue can access good refinement, and workpiece inside and infiltration layer scope exist uniform perlite and tiny blocky ferrite, and this is organized in and is raised to Ac
3More than be Ac
3Quench after+(30～50) ℃ and the insulation, the carbide of superfine length is easy to dissolve, diffuse to form tiny granular carbide, the homogenizing of while perlite and ferritic structure, make that the carbide that dissolved is saturated in the austenite is tiny, obtain the granular carbide that fine acicular martensite and disperse distribute after the quenching.Because the influence of structural stress and thermal stresses reduces, thereby reduced the distortion in the quench cooled process, it is inside and outside in quality to have improved product, has overcome traditional technology or inner quality difference or the overproof weakness of external distortion.Carburizing quenching process of the present invention, workpiece can obtain good inner quality and external quality, and workpiece can obtain higher work-ing life in the process under arms.
(4) description of drawings
Fig. 1 is the structural representation of the medium and heavy automotive driven cone gear of the embodiment of the invention.
Fig. 2 is a process curve synoptic diagram of the present invention.
Wherein, a is the intensification exhaust phase among the figure; B carburizing diffusion phase (b
1Be the carburizing stage,
b
2Be diffusion phase); C is a temperature-fall period; D is the temperature rise period; E is a holding stage; F is the quenching stage.
(5) embodiment
This specific embodiment is the carburizing quenching process of a heavy-duty car driven bevel pinion as shown in Figure 1, and single-piece weight is 9Kg, and modulus is 10, and the number of teeth is 33, and material is 22CrMoH, and it is Ac that the austenite of this material begins transition temperature
1It is 730 ℃; The complete austenitizing temperature is Ac
3It is 785 ℃.Product technology requires: effectively carburized layer depth is 0.9-1.2mm, and quenching rear surface hardness is HRC59-63, and centre hardness is HRC33-48, and metallographic structure meets ZBJ04001-88 automobile gear metallographic carburizing standard, and external distortion as shown in Figure 1.
As shown in Figure 2, this specific embodiment comprises the following processing step that carries out successively: the intensification exhaust, see a stage among Fig. 2; The b of b in the stage among Fig. 2 seen in carburizing
1Stage; B among Fig. 2 is seen in diffusion
2Stage; Be cooled to Ac
1The c stage among Fig. 2 is seen in-(30～50) ℃; Be raised to quenching temperature Ac
3The d stage among Fig. 2 is seen in+(30～50) ℃ insulation; Quench, see the f stage among Fig. 2.
This specific embodiment use equipment is a controlled atmosphere sealed-box type multipurpose furnace, and batch is 84.Parameters such as time, carbon potential, temperature can be set in the program of PVH system and carry out.Time is controlled by the time relay; Carbon potential is controlled by carbon control instrument; Power is by the control of KT series power regulating eqiupment, and by the power regulating eqiupment temperature control, temperature signal is by the thermopair transmission; Carburizing agent is nitrogen, methyl alcohol and propane, and wherein nitrogen and methyl alcohol are thinner, and the amount of dripping is 3000ml/h during carburizing; Propane is enriched gas, maintains 4-6L/min during carburizing; 920 ± 10 ℃ of carburizing temperatures are cooled to 690 ± 10 ℃, and quenching temperature is 825 ± 10 ℃.The tooth piece that test block employing and product material, modulus, processing mode be identical, have 3 teeth.By carburizing quenching process program shown in the process curve establishment table 1 shown in Figure 2, carry out then, up to EP (end of program), finish carburizing quenching process automatically.
This furnaceman's part cuts open inspection through the processing of aided processes such as cleaning, tempering, surface-conditioning to tooth piece and 1 product, checks all qualified and obvious raisings of inner quality.To the external distortion inspection of all the other 83 follow-up pulleys, meet have 79 of Fig. 1 technical requirements, promptly adopt this process distortions qualification rate to reach 95%, effect is significantly better than the level of common carburizing quenching process qualification rate 50-70%.But all the other 4 second-heating are reprocessed with Quenching press.
Heavy-duty car gear carburizing quenching novel process is reduced to Ac after the diffusion of employing carbon potential
1Following temperature is raised to quenching temperature Ac again
3More than insulation and quenching have effectively reduced the distortion in the quench cooled process, and it is inside and outside in quality to have improved product.This invention is applicable to relevant carburizing equipments such as box-type furnace, pit furnace, is suitable for the carburizing of heavy-duty car gear class.
Table 1
| Programsegment | Temperature | Carbon potential | Time | Magnetic valve | Explanation | |
| CH 1 | CH 2 | | TS | Parameter | ||
| 1 | 920 | 0.00 | 0 | 2 | Heat up, rise carbon potential | |
| 2 | 920 | 1.05 | 0.1 | 2 | Waiting signal | |
| 3 | 920 | 1.05 | 10 | 2 | | |
| 4 | 920 | 1.05 | 180 | 2 | Carburizing | |
| 5 | 920 | 0.85 | 0 | 2 | The carbon drop gesture | |
| 6 | 920 | 0.85 | 0.1 | 2 | Waiting signal | |
| 7 | 920 | 0.85 | 120 | 2 | Diffusion | |
| 8 | 680 | 0 | 0 | 1 | Cooling, carbon drop gesture | |
| 8 | 680 | 0 | 0.1 | 1 | Waiting signal | |
| 8 | 830 | 0.85 | 0.1 | 2 | Heat up, rise carbon potential | |
| 9 | 830 | 0.85 | 60 | 2 | Insulation | |
| 10 | 830 | 0.85 | 0.1 | 2 | Waiting signal | |
| 11 | 830 | 0.85 | 5 | 2 | Quench | |
| 12 | 830 | 0.85 | 0 | 7 | End signal |
Annotate: TS=1, control propane flow solenoid valve closes; TS=2, control propane flow valve opening solenoid, the TS=7 program is defeated again.
Claims (2)
1, a kind of gear carburizing quenching process for heavy-duty automobile is characterized in that: comprise the following processing step that carries out successively: carburizing, spread, be cooled to Ac
1-(30～50) ℃, be warming up to Ac
3+ (30～50) ℃ insulation, quenching.
2, gear carburizing quenching process for heavy-duty automobile according to claim 1 is characterized in that: diffusion temperature is 920 ± 10 ℃, and soaking time is 60-90min, and carburizing uses carburizing agent to be nitrogen-methyl alcohol-propane or Sweet natural gas-RX gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100140030A CN100473763C (en) | 2007-03-21 | 2007-03-21 | Gear carburizing quenching process for heavy-duty automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100140030A CN100473763C (en) | 2007-03-21 | 2007-03-21 | Gear carburizing quenching process for heavy-duty automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101029398A true CN101029398A (en) | 2007-09-05 |
| CN100473763C CN100473763C (en) | 2009-04-01 |
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ID=38714943
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100140030A Expired - Fee Related CN100473763C (en) | 2007-03-21 | 2007-03-21 | Gear carburizing quenching process for heavy-duty automobile |
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| CN (1) | CN100473763C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103348022A (en) * | 2011-03-31 | 2013-10-09 | 爱信艾达株式会社 | Steel gear wheel and method for manufacturing same |
| CN103403197A (en) * | 2011-03-31 | 2013-11-20 | 爱信艾达株式会社 | Steal gear wheel and method for manufacturing same |
| CN103710714A (en) * | 2012-12-07 | 2014-04-09 | 厦门真冈热处理有限公司 | Automobile gearbox gear carburizing and quenching heat treatment method |
| CN104120219A (en) * | 2014-07-24 | 2014-10-29 | 成都亨通兆业精密机械有限公司 | Gear production process |
| CN104213070A (en) * | 2014-07-30 | 2014-12-17 | 珠海市钧兴机电有限公司 | Control process for carburized layer of sewing machine gear |
| CN107177724A (en) * | 2016-03-09 | 2017-09-19 | 天津建筑机械厂 | Heavy load carburized parts composite heating quenching technical |
| CN107254624A (en) * | 2017-06-01 | 2017-10-17 | 马鞍山钢铁股份有限公司 | A kind of diameter 90mm above Big sized gear steel and its production method |
| CN110951962A (en) * | 2019-12-16 | 2020-04-03 | 武汉理工大学 | High-performance gear heat treatment method for realizing fine and homogenized structure |
| CN113737126A (en) * | 2021-09-09 | 2021-12-03 | 北京机电研究所有限公司 | Vacuum carburization method for obtaining dispersed fine carbides |
| CN113737125A (en) * | 2021-09-09 | 2021-12-03 | 北京机电研究所有限公司 | Vacuum carburization method for obtaining dispersed fine carbides |
| CN114000094A (en) * | 2021-11-03 | 2022-02-01 | 徐州徐工传动科技有限公司 | Carburizing and quenching process for thin-wall gear |
-
2007
- 2007-03-21 CN CNB2007100140030A patent/CN100473763C/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103403197A (en) * | 2011-03-31 | 2013-11-20 | 爱信艾达株式会社 | Steal gear wheel and method for manufacturing same |
| CN103403197B (en) * | 2011-03-31 | 2014-09-03 | 爱信艾达株式会社 | Steal gear wheel and method for manufacturing same |
| CN103348022B (en) * | 2011-03-31 | 2014-09-03 | 爱信艾达株式会社 | Steel gear wheel and method for manufacturing same |
| CN103348022A (en) * | 2011-03-31 | 2013-10-09 | 爱信艾达株式会社 | Steel gear wheel and method for manufacturing same |
| CN103710714A (en) * | 2012-12-07 | 2014-04-09 | 厦门真冈热处理有限公司 | Automobile gearbox gear carburizing and quenching heat treatment method |
| CN103710714B (en) * | 2012-12-07 | 2016-02-03 | 厦门真冈热处理有限公司 | The heat treating method of automobile gearbox gear carburizing and quenching |
| CN104120219A (en) * | 2014-07-24 | 2014-10-29 | 成都亨通兆业精密机械有限公司 | Gear production process |
| CN104213070B (en) * | 2014-07-30 | 2018-12-11 | 珠海市钧兴机电有限公司 | Sewing machine gear wheel carburization layer control technique |
| CN104213070A (en) * | 2014-07-30 | 2014-12-17 | 珠海市钧兴机电有限公司 | Control process for carburized layer of sewing machine gear |
| CN107177724A (en) * | 2016-03-09 | 2017-09-19 | 天津建筑机械厂 | Heavy load carburized parts composite heating quenching technical |
| CN107254624A (en) * | 2017-06-01 | 2017-10-17 | 马鞍山钢铁股份有限公司 | A kind of diameter 90mm above Big sized gear steel and its production method |
| CN110951962A (en) * | 2019-12-16 | 2020-04-03 | 武汉理工大学 | High-performance gear heat treatment method for realizing fine and homogenized structure |
| CN113737126A (en) * | 2021-09-09 | 2021-12-03 | 北京机电研究所有限公司 | Vacuum carburization method for obtaining dispersed fine carbides |
| CN113737125A (en) * | 2021-09-09 | 2021-12-03 | 北京机电研究所有限公司 | Vacuum carburization method for obtaining dispersed fine carbides |
| WO2023036251A1 (en) * | 2021-09-09 | 2023-03-16 | 中国机械总院集团北京机电研究所有限公司 | Vacuum carburizing method for obtaining dispersedly distributed fine carbide |
| CN113737126B (en) * | 2021-09-09 | 2023-09-29 | 中国机械总院集团北京机电研究所有限公司 | Vacuum carburization method for obtaining dispersed fine carbide |
| CN113737125B (en) * | 2021-09-09 | 2024-02-20 | 中国机械总院集团北京机电研究所有限公司 | Vacuum carburization method for obtaining dispersed fine carbide |
| CN114000094A (en) * | 2021-11-03 | 2022-02-01 | 徐州徐工传动科技有限公司 | Carburizing and quenching process for thin-wall gear |
| CN114000094B (en) * | 2021-11-03 | 2023-05-19 | 徐州徐工传动科技有限公司 | Carburizing and quenching process for thin-wall gear |
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| Publication number | Publication date |
|---|---|
| CN100473763C (en) | 2009-04-01 |
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| C14 | Grant of patent or utility model | ||
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| ASS | Succession or assignment of patent right |
Owner name: CHINA NATIONAL HEAVY DUTY TRUCK GROUP JINAN POWER Free format text: FORMER OWNER: JINAN TECH CENTER CO., LTD., CHINA HEAVY TRUCK GROUP Effective date: 20101027 |
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Effective date of registration: 20101027 Address after: 250002 Ji'nan, central city, Shandong hero hill road, No. 165 Patentee after: China National Heavy Duty Truck Group Jinan Power Co., Ltd. Address before: 250002 Ji'nan, central city, Shandong hero hill road, No. 165 Patentee before: Jinan Tech Center Co., Ltd., China Heavy Truck Group |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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