压缩比对大应变挤出切削过程影响的有限元分析

Finite Element Analysis on Influence of Different Compression Ratio to Extrusion Machining in Severe Plastic Deformation

介绍纳米晶材料的加工前景和纳米晶带材的一种制备方法,即大应变挤出切削。建立了基于大变形有限元理论的平面应变正交切削有限元仿真模型。采用Deform对切削过程进行仿真,研究了切削过程中压缩比对切削力、等效应力、等效应变和切削温度的影响,旨在探索大应变挤出切削过程中压缩比对切削过程的影响规律,优选出合理的切削参数。

First, extrusion machining in severe plastic deformation which is regarded as a novel approach to manufacture nanostructure materials is introduced. Then, a large strain model describing the extrusion machining is established. The effects of the compression ratio on the cutting forces, equivalent stress, equivalent strain and tem- perature are investigated by finite element method. At last, a reasonable cutting parameter is selected according to the finite element analysis.