金属热处理 ›› 2025, Vol. 50 ›› Issue (4): 290-295.DOI: 10.13251/j.issn.0254-6051.2025.04.045

• 表面工程 • 上一篇    下一篇

船用柴油机凸轮轴失效分析及复合喷丸强化处理

姚亚俊1,2, 吴心波1,2, 罗长增1,2,3, 李成艳1,2, 徐得石1,2, 姜传海4   

  1. 1.潍柴动力股份有限公司, 山东 潍坊 261061;
    2.内燃机与动力系统全国重点实验室, 山东 潍坊 261061;
    3.南京航空航天大学 材料科学与技术学院, 江苏 南京 211106;
    4.上海交通大学 材料科学与工程学院, 上海 200240
  • 收稿日期:2024-11-04 修回日期:2025-02-13 发布日期:2025-06-13
  • 通讯作者: 罗长增,高级工程师,博士研究生,E-mail: luocz@weichai.com
  • 作者简介:姚亚俊(1984—),女,工程师,硕士,主要研究方向为发动机零部件强化,E-mail: yaoyajun@weichai.com。
  • 基金资助:
    山东省重点研发计划(2024CXPT067)

Failure analysis of camshaft for marine diesel engines and composite shot peening strengthening treatment

Yao Yajun1,2, Wu Xinbo1,2, Luo Changzeng1,2,3, Li Chengyan1,2, Xu Deshi1,2, Jiang Chuanhai4   

  1. 1. Weichai Power Co., Ltd., Weifang Shandong 261061, China;
    2. State Key Laboratory of Engine and Powertrain System, Weifang Shandong 261061, China;
    3. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing Jiangsu 211106, China;
    4. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2024-11-04 Revised:2025-02-13 Published:2025-06-13

摘要: 对某船用柴油机凸轮轴经耐久循环试验后凸轮桃尖剥落问题进行了失效分析,并给出了提高凸轮轴接触疲劳强度的复合喷丸强化方法。结果表明,凸轮轴的显微组织、硬度、淬硬层深度均处于正常范围,其失效原因为接触疲劳剥落。采用陶瓷丸0.15A+玻璃丸0.07A的复合喷丸处理后,凸轮表面残余压应力场分布均匀,表层残余压应力提升到1284 MPa、次表层残余压应力提升到1322 MPa,表层残留奥氏体含量降低到0.8%,表层硬度提升到971 HV0.05。这表明复合喷丸强化可有效解决凸轮轴接触疲劳剥落的问题。

关键词: 凸轮轴, 接触疲劳剥落, 复合喷丸, 残余应力, 硬度

Abstract: Failure analysis was conducted on the spalling problem of cam tip of a marine diesel engine camshaft after durability cycle testing, and a composite shot peening strengthening method was proposed to improve the contact fatigue strength of the camshaft. The results show the microstructure, hardness and hardened layer depth of the camshaft are all within the normal range, and the failure cause of the camshaft is contact fatigue spalling. After composite shot peening by using ceramic shot (0.15A)+glass shot (0.07A), the residual compressive stress distribution on the cam surface is uniform. The residual compressive stress in the surface layer is increased to 1284 MPa, and that in the subsurface layer is increased to 1322 MPa. The retained austenite content in the surface layer is reduced to 0.8%, and the surface hardness is increased to 971 HV0.05. This indicates that the composite shot peening strengthening can effectively solve the problem of contact fatigue spalling of the camshaft.

Key words: camshaft, contact fatigue spalling, composite shot peening, residual stress, hardness

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