引用本文:乔治,梁志强,赵文祥,李宏伟,黄迪青,王西彬.齿轮钢30CrMnTi磨削强化试验[J].中国表面工程,2017,30(1):26~32
QIAO Zhi,LIANG Zhi-qiang,ZHAO Wen-xiang,LI Hong-wei,HUANG Di-qing,WANG Xi-bin.Grinding Hardening of 30CrMnTi Gear Steel[J].China Surface Engineering,2017,30(1):26~32
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齿轮钢30CrMnTi磨削强化试验
乔治1, 梁志强1, 赵文祥1, 李宏伟1,2, 黄迪青1, 王西彬1
1.北京理工大学 先进加工技术国防重点学科实验室, 北京 100081;2.北京北方车辆集团有限公司, 北京 100072
摘要:
30CrMnTi钢广泛应用于齿轮的生产制造中，为提高齿轮的抗疲劳性能及探讨磨削工艺参数对其表面强化的影响，开展了齿轮钢30CrMnTi的磨削试验，分析了磨削速度和磨削深度对磨削表面强化层显微组织、强化层深度、表面显微硬度和强化层残余应力的影响规律。结果表明，齿轮钢30CrMnTi磨削加工后得到一定强化层，表面显微组织为针状马氏体、碳化物和少量残余奥氏体，且强化层马氏体组织由磨削表面到心部呈“细-较粗”的变化趋势，硬度先增大后减小，强化层深度随磨削深度或磨削速度的增大而增加，磨削后表面显微硬度提高2%~13%，随磨削速度降低或磨削深度增大而增大。磨削过程对残余应力的影响在表面表现为拉应力，沿层深向内逐渐转化为压应力。磨削表面残余压应力的值随磨削速度或磨削深度的增大而降低。通过合理的磨削参数可实现齿轮钢30CrMnTi的表面磨削强化。
关键词:  齿轮钢  磨削  强化  显微硬度  残余应力
DOI：10.11933/j.issn.1007-9289.20160809002
分类号:
基金项目:国防基础科研项目（A0920132008）；国家重点基础研究发展计划（973计划）（2015CB059900）
Grinding Hardening of 30CrMnTi Gear Steel
QIAO Zhi1, LIANG Zhi-qiang1, ZHAO Wen-xiang1, LI Hong-wei1,2, HUANG Di-qing1, WANG Xi-bin1
1.Key Laboratory of Fundamental Science for Advanced Machining, Beijing Institute of Technology, Beijing 100081;2.Beijing North Vehicle Group Corporation, Beijing 100072
Abstract:
The gear steel 30CrMnTi is widely used for the fabrication of gear. In order to improve the anti-fatigue performance of the gear and clarify the effect of grinding process parameters on the surface grinding-hardening, symmetrical grinding experiments on 30CrMnTi were carried out. Microstructure and thickness of the hardening layer, surface micro-hardness and residual stress at different grinding speeds and depths were analyzed. The results show that the hardening layer of gear steel 30CrMnTi is formed in grinding procedure, and its microstructure includes acicular martensite, carbide and residual austenite. In the hardening layer, the microstructure of the martensite becomes coarser from the surface to the inner, and the micro hardness increases firstly and then decreases along the direction. The thickness of the hardening layer increases with the increase of grinding depth and speed. The surface micro hardness is increased by 2%-13% after grinding. Specifically, it increases with the decrease of grinding speed or the increase of depth. The residual stress on the grinding process is tensile stress, which gradually transforms into compressive stress when the depth reaches a critical value. The value of the residual compressive stress on the grinding surface decreases with the increase of grinding depth and speed. The gear steel 30CrMnTi can be hardened by the appropriate grinding parameters.
Key words:  gear steel  grinding  hardening  micro hardness  residual stress
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