发动机曲轴的激光冲击复合处理工艺研究  

Investigation of Combination Laser Treatment Technique on Engine Crankshaft

作　　者：任旭东[1] 张永康[1] 周建忠[1] 张新权[1] 

机构地区：[1]江苏大学机械工程学院,镇江212013

出　　处：《内燃机工程》2007年第2期56-59,共4页Chinese Internal Combustion Engine Engineering

基　　金：国家863计划资助项目(2002AA336030);国家自然科学基金(50275068)

摘　　要：介绍了激光冲击强化和修复曲轴的新方法,并与其它曲轴处理方法进行了比较。实践表明选择合适的工艺参数,可在零件表面得到搭接均匀,表面硬度大于600 HV和厚度达到1．0 mm的硬化层,冲击区表层残余应力达到-495 MPa,而绝对磨损体积下降了133％以上。对磨损曲轴,可以先采用激光熔覆处理,然后对修补区进行激光冲击处理。激光冲击强化复合处理具有表面硬度高、零件变形小和不影响曲轴轴心部性能等优点,可以使性能超过无损伤曲轴,能实现曲轴的再循环利用,大幅度降低了生产成本。This paper introduced a new method of strengthening and repairing crankshaft by laser shock processing, and also compared with other strengthen methods of the crankshaft. The experiments show that a uniform hardened layer with the thickness of 1.0 mm and hardness of 600 HV is obtained on the crankshaft surface by selecting proper technologic parameters in laser shock processing. The influence of the residual stresses induced by the laser shocking on the fatigue process of crankshaft section under bending was investigated. Compressive residual stresses at the shocked area are about 495 MPa and the abrasive quantities of crankshaft are down about 133%, an abrasive wear crankshaft is repaired by laser cladding and laser shocking. The crankshaft strengthened by laser shock processing possesses some advantages, such as much higher hardness, much fine microstructure, less distortion and no changes in core properties. And its mechanical property super to former crankshaft, this treatment put forward the solution of caring out recondition, utilization of the crankshaft, and lower costs of production.

关 键 词：内燃机 激光冲击 强化 曲轴 修复 

分 类 号：TK406[动力工程及工程热物理—动力机械及工程]