摘要
从轴颈滚压加工的二维平面问题入手,对其滚压加工过程进行了数值模拟,研究了滚压道次、摩擦系数对塑性变形层和残余应力的影响,轴颈滚压加工的二维模拟表明:滚压道次对变形层的总厚度、局部塑性应变的数值及其分布的影响很小,摩擦力有一定的表面硬化作用,但相对来说,随着摩擦系数的增大次表层和深层残余应力提高并不明显;在此基础上建立了曲轴圆角滚压加工的三维刚-柔接触的压入-分离模型,通过与小野式滚压试件的试验结果比较,结论为:在工件的最表层,由于有限元方法不能考虑材料的硬化效应,残余应力数值偏小,x射线法实测的残余应力则较为准确,而在工件的亚表层乃至深层,计算结果与试验结果的残余应力吻合较好。
The 2D numerical simulation on the rolling process of the crankshaft journal is carried out and the influence of rolling times and friction coefficient on the plastic deforming layer and residual stress caused by rolling pass is studied. The 2D simulation of journal rolling process shows that the rolling times has little influence on the depth of deforming layer and the magnitude and distribution of plastic strain. Friction force has certain effect on the surface hardening. However, with increasing friction force, the raising of the residual stress in subsurface and deep layer is not obvious. Based on the above consideration, the embedded-separated 3D rigid-flexible contact model of crankshaft fillet rolling process is established. By comparison with the experimental results of Oho rolling specimen, the results show that, on the surface layer of a work piece, the magnitude of residual stress measured by x-ray method gives the accurate value comparing with the calculation by the finite element method which does not account of material harden effect. For the subsurface and deep layer, the calculation results give good agreement with the experimental data.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2008年第3期283-287,共5页
Transactions of Csice
基金
国家自然科学基金资助项目(50675060)
河北科技师范学院博士基金项目(2006D009)
关键词
曲轴
滚压
接触
残余应力
模拟
Crankshaft
Rolling
Contact
Residual stress
Simulation
