基于DEFORM-3D的镍基合金钢的切削性能仿真研究

Finite element simulation of nickel-based alloy cutting based on DEFORM-3D

基于DEFORM-3D V6.1建立了三维切削有限元模型,对镍基高温合金IN718切削过程进行了模拟,获得了不同进给量、切削速度和背吃刀量下切削力、切削温度的变化规律;研究了在不同冷却方式下镍基合金加工过程的温度变化趋势.仿真结果表明:对切削力而言,各因素中切削速度影响最小、背吃刀量影响最大;对切削温度而言,各因素中切削速度影响最大,进给量次之,背吃刀量影响最小;换热系数对工件和刀具的最高温度和平均切削力的影响不大,但对平均温度的影响比较明显,换热系数越大则平均温度越低.

To study the Ni-based superralloy cutting mechanism and heat transfer coefficient of superalloy IN718,this paper presents the general steps and basic principles of three-dimensional finite element simulation.Based on DEFORM-3D V6.1,a three-dimensional finite element model of cutting process is established,and the variation of cutting force and cutting temperature with different feed per tooth,cutting speed and cutting depth are obtained.At the same time,the trend of temperature change on the processing of nickel-based alloys under some common cooling methods is studied in detail.Simulation results show that for the cutting force,the minimum impact is the cutting speed whereas the greatest one is cutting depth;for the cutting temperature,cutting speed has the greatest influence,followed by feed rate,cutting depth is the least.Heat transfer coefficient has no much influence on the workpiece,the tool＇s maximum temperature,and average cutting force.However,for the average temperature,it has a clear influence.The greater the heat transfer coefficient is,the lower the average temperature is.Finally,according to the simulation results,a reasonable range of options for practical application is recommended.