基于FEM-SPH耦合方法的AISI4340钢超精密切削过程仿真  

Simulation research on AISI4340 steel ultra-precision cutting process based on FEM-SPH coupling method

作　　者：郭晓光[1] 魏延军[1] 张小冀[1] 金洙吉[1] 郭东明[1] 

机构地区：[1]大连理工大学精密与特种加工教育部重点实验室,辽宁大连116024

出　　处：《大连理工大学学报》2013年第4期526-531,共6页Journal of Dalian University of Technology

基　　金："九七三"国家重点基础研究发展规划资助项目(2011CB706704)

摘　　要：数值模拟是研究金属切削的重要手段,但有限元方法(FEM)由于依赖网格而存在一定的局限性,不适宜处理大变形问题.光滑粒子动力学(SPH)是一种无网格法,可以避免网格畸变,解决切削过程中材料大变形问题.结合两种方法的各自优点,建立了AISI4340钢金刚石超精密切削过程的FEM-SPH耦合模型,研究切削过程中材料的去除机理.仿真结果表明:随着切削过程的进行工件内部应力逐渐增大,当达到屈服极限时,工件材料沿前刀面塑性流动,形成切屑,刀尖钝圆的推挤起了决定性的作用;成形表面下存在较为严重的残余应力;切削热主要来源于切削过程中塑性功的转换且大部分被切屑带走;增大刀尖钝圆半径将会使切削力尤其是切削抗力显著增大.Numerical simulation is an important approach to metal cutting process, but finite element method （FEM） has some limitations and can not handle large deformation problems since it＇s based on mesh. Smoothed particle hydrodynamics （SPH） is a mesh-free method and can avoid mesh distortion and hence resolve large deformation of materials in cutting. Combining the advantages of conventional FEM with the mesh-free method, SPH, a FEM-SPH coupling model for AISI4340 steel diamond ultra-precision cutting is established and the cutting mechanism is studied. The simulation results show that： with the inner stress increasing and reaching yield stress, the cutting layer material flows in a plastic fashion to forma chip and tool edge plays a key role in observed beneath the formed surface; cutting heat is mainly transformation and most heat is taken away by the chip; a large increment in cutting force, especially in the thrust force. cutting; severe residual stress is converted from edge radius will

关 键 词：超精密切削 无网格法 FEM—SPH耦合 仿真 

分 类 号：TG501.1[金属学及工艺—金属切削加工及机床]