切削深度对铝合金加工过程影响的数值仿真  

Numerical Simulation for Effect of Cutting Depth on Al-alloy Cutting Process

作　　者：刘胜永[1] 万晓航[2] 董兆伟[2] 

机构地区：[1]河北师范大学机械系,石家庄050031 [2]河北工业职业技术学院,石家庄050091

出　　处：《有色金属》2007年第2期32-34,共3页Nonferrous Metals

基　　金：河北省科技厅科研资助项目(05212105D);河北省教育厅科研资助项目(2002240)

摘　　要：采用Lagrange质点坐标系描述方法,利用有限元分析软件,建立了二维热-力耦合正交直角切削有限元模型,通过网格自适应技术,模拟切屑的形成,仿真切削深度对铝合金加工变形的影响。结果表明,切削深度对切削力的影响呈线性正比例关系。切削深度越大,切削面积和切削宽度相应增加,切削力也越大。切削深度影响切削加工产生的残余应力大小及分布,残余应力分布在工件表面以下的0.2mm以内很薄的金属层,这对于厚度较小的薄壁件加工后的变形有很大的影响。加工时,为了提高工件表面的精加工精度,降低工件表面的残余应力,在精加工时尽量采用小的切削深度。The effect of the cutting depth on the cutting process of the Al-alloy is investigated. The two-dimension heat-mechanic coupling orthogonal cutting model is established with the FEM analysis software by use of the Lagrange quality point coordinate system description method. The work-piece chip breaking process is simulated by the adaptive meshing criteria. The results show that the effect of cutting depth on cutting force is in linearity. The more the cutting depth, the more the cutting area and the cutting width, and the bigger the cutting force. The distribution and magnitude of the residual stress resulted by machining is influenced by the cutting depth. The residual stress distributes in the thin layer with less than 0.2mm under the surface of work, so its effects on the machining deformation of thin wall parts is remarkable. Therefore, the small cutting depth is firstly used in finish working procedure in order to improve the machining precision and reduce the residual stress of work surface.

关 键 词：金属材料 铝 切削 有限元 切削深度 

分 类 号：TG501.1[金属学及工艺—金属切削加工及机床] TP391.9[自动化与计算机技术—计算机应用技术]