基于Oxley理论的40CrMnMo合金钢车削过程剪切区应力应变行为研究  

Research on Stress and Strain in Turning Process of 40CrMnMo Based on Oxley-Welsh Theory

作　　者：袁森 蒋宏婉 何林 Yuan Sen;Jiang Hongwan;He Lin(Guizhou Institute of Technology, Guiyang 550003, Chin)

机构地区：[1]贵州理工学院 [2]贵州省特色装备及制造技术重点实验室

出　　处：《工具技术》2018年第6期24-28,共5页Tool Engineering

基　　金：国家自然科学基金(51265005);教育部博士点基金(20125201110001)

摘　　要：基于Oxley-Welsh切削理论和40Cr Mn Mo工件材料的车削试验,综合考虑剪切区材料尺寸变化、温度及加工硬化等因素对剪切区应力应变行为的影响,探讨了40Cr Mn Mo工件材料切削过程中切削用量对剪切区应力应变的作用规律。研究结果表明:车削过程中工件材料40Cr Mn Mo剪切区的静水压应力与剪切流动应力的差对40Cr Mn Mo工件材料的均匀塑性变形有显著影响;静水压应力大表明剪切区材料加工硬化作用明显,温度对工件材料热软化作用弱,材料塑性变形均匀;当v_c=115m/min、f=0.42mm/r、a_p=3.5mm时,40Cr Mn Mo工件材料剪切区静水压应力与剪切流动应力的应力差最大,其均匀塑性变形最佳,抗不均匀塑性变形能力最强。Based on Oxley-Welsh theory and cutting experiment of 40 Cr Mn Mo,the influence of size,temperature and hardening of the shear zone material on the stress-strain behavior of this zone are discussed. The effect of the cutting parameters on stress-strain behavior of the shear zone during the turning process of the workpiece material 40 Cr Mn Mo is focused on. The results show that the difference between the hydrostatic stress and the shear flow stress has a significant effect on the uniform plastic deformation of workpiece material 40 Cr Mn Mo. The larger hydrostatic stress indicates the obvious strain hardening of the shear zone materials,the slight thermal softening effect and the uniform plastic deformation. When vc=115 m/min,f = 0. 42 mm/r and ap= 3. 5 mm,the stress difference between the hydrostatic stress and the shear flow stress is largest,the uniform plastic deformation is best,and the resistance to inhomogeneous plastic deformation is strongest.

关 键 词：Oxley-Welsh理论 加工硬化 剪切流动应力 静水压应力 

分 类 号：TG712[金属学及工艺—刀具与模具] TH162[机械工程—机械制造及自动化]