锻压技术

基于汽车转向活塞锻造遗留效应的预先热处理工艺优化

英文标题：Preheat treatment process optimization based on forging legacy effect for automobile steering piston

作者：毛胜辉付甲

分类号：TG311

出版年,卷(期):页码：2020,45(7):182-186

摘要：

针对某型号汽车转向活塞交付过程中多次出现组织粗大、混晶的现象，采用理论分析和实验研究相结合的方法，对其锻造和预先热处理工艺过程进行了分析和研究。根据转向活塞成形过程的工艺特点，结合塑性成形过程中变形量和变形温度与再结晶之间的关系，分析了不同变形部位的再结晶状态，从原理上指出了现有锻造余热正火工艺的不足。根据奥氏体的形核、长大、均匀化机制，结合过冷奥氏体分解所需要的条件，设计了转向活塞加热、风冷、等温的3步走的预先热处理工艺方案。优化了转向活塞的预先热处理工艺，消除了因锻造带来的遗留效应，为后期的机械加工和渗碳淬火奠定了技术基础。

For the phenomenon that the coarse microstructure and mixed crystal frequently occur in the delivery for a certain type of automobile steering piston, the forging and preheat treatment processes were analyzed and studied by combining theoretical analysis and experimental research. According to the technological characteristics of steering piston forming process, combining with the relationships among deformation amount, deformation temperature and recrystallization, the recrystallization states in different deformation positions were analyzed, and the shortage of present forging waste heat normalizing process was pointed out in principle. Based on the mechanism of austenite nucleation, growth and homogenization, combining with the requirements of undercooled austenite decomposition, the three-step preheat treatment process scheme of steering piston including heating, air cooling and isothermal transformation was designed, and the preheat treatment process of steering piston was optimized to eliminate the legacy effect caused by forging, which provided technical guarantee for the practical mechanical processing and carburizing and quenching.

基金项目：

国家自然科学基金资助项目（51905427）

毛胜辉（1972-），男，硕士，副教授 E-mail：msh008@126.com

参考文献：

[1]张义帅，孙红星，张超，等. 汽车转向轴齿磨削裂纹产生的机理及预防措施[J]. 锻压技术，2019，44（7）：92-96.

Zhang Y S, Sun H X, Zhang C, et al. Mechanism and preventive measures on grinding cracks for automobile steering shaft tooth [J]. Forging ＆ Stamping Technology, 2019,44(7):92-96.

[2]宋海兵，谢军，王春宏，等.汽车液压循环球式动力转向器[P].中国：CN203528592U, 2014-04-09.

Song H B, Xie J, Wang C H, et al. Automobile hydraulic circulating balltype power steering gear [P].China:CN203528592U, 2014-04-09.

[3]徐鹏. 循环球式变比转向器传动比曲线测试系统设计[D].武汉：武汉理工大学，2014.

Xu P. Design of a Transmission Ratio Curve Test System Recirculatingball Variable Ratio Steering Gear [D]. Wuhan: Wuhan University of Technology, 2014.

[4]赵昌德，刘虹，何继忠，等. 汽车转向机活塞齿部锻造工艺[P].中国：CN102166615A, 2011-08-31.

Zhao C D, Liu H, He J Z, et al. Forging process for piston toothed part of automobile steering box [P].China: CN102166615A, 2011-08-31.

[5]张义帅，孙红星，刘丹，等. 过冷奥氏体等温转变在转向轴齿预先热处理中的应用[J].锻压技术，2019，44（9）：167-171.

Zhang Y S, Sun H X, Liu D, et al. Application of overcooling austenite isothermal transformation in preheat treatment for steering shaft tooth [J]. Forging ＆ Stamping Technology, 2019,44(9):167-171.

[6]刘晓鑫. 重型车辆的液压助力转向系统仿真分析[D].长春：吉林大学，2011.

Liu X X. Simulation and Analysis on Hydraulic Power Steering System of Heavy Vehicle [D]. Changchun: Jilin University, 2011.

[7]俞汉清，陈金德.金属塑性成形原理[M]. 北京：机械工业出版社，2018.

Yu H Q, Chen J D. Principles of Metal Plastic Forming [M]. Beijing: China Machine Press, 2018.

[8]叶玉娟，高全德. 30CrNi3MoVA钢的晶粒细化及组织均匀化研究[J].锻压技术，2019，44（5）：169-173.

Ye Y J, Gao Q D. Research on grain refinement and organization uniformity of 30CrNi3MoVA steel [J]. Forging ＆ Stamping Technology, 2019,44(5):169-173.

[9]刘宗昌，任慧平，王海燕.奥氏体形成与珠光体转变[M].北京：冶金工业出版社，2010.

Liu Z C, Ren H P, Wang H Y. Austenite Formation and Pearlite Transformation [M]. Beijing: Metallurgical Industry Press, 2010.

[10]刘红军. 8620H齿轮锻件等温正火工艺探讨[J].热加工工艺，2010，39(16)：154-155.

Liu H J. Discussion of isothermal normalizing technology for 8620H gear forging [J].Hot Working Technology,2010,39(16):154-155.

[11]刘云旭，王淮，季长涛，等.正火-影响渗碳齿轮热处理畸变的一个重要因素[J].金属热处理，2005，30(3)：46-49.

Liu Y X, Wang H, Ji C T, et al. Normalizing：An important factor influencing heat treatment distortion of the carburized gears [J]. Heat Treatment of Metals, 2005, 30(3):46-49.

[12]陈晖，周细应. 汽车齿轮热处理工艺的研究进展[J].材料导报，2010，24(7)：93-96，101.

Chen H, Zhou X Y. Review and progress of heat treatment process for automobile gear [J]. Materials Review, 2010, 24(7):93-96,101.

[13]王长生，罗美华，徐云珍.汽车后桥螺旋锥齿轮锻坯正火工艺对其组织和性能的影响[J].热加工工艺，1998，36(5)：24-26.

Wang C S, Luo M H, Xu Y Z. Effect of normalizing process on structure and properties for automobile rear axle spiral bevel gear forging blank[J]. Hot Working Technology, 1998, 36(5):24-26.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】