钛合金薄壁件铣削过程有限元仿真分析

Finite Element Simulation Analysis of Thin-Walled Parts Milling Process of Titanium Alloy

钛合金薄壁件铣削过程中,刀具角度对铣削过程中的工件变形、铣削力、铣削振动等影响显著。为减轻刀具磨损延长刀具寿命,通过ABAQUS软件建立钛合金Ti6Al4V薄壁件铣削过程仿真模型,以铣削力和铣削温度为评价指标,采用单因素和正交法分析了刀具前角、后角及螺旋角对铣削力和铣削温度的影响规律,并对铣削力仿真结果进行试验验证。仿真结果表明:前角增大,铣削力减小,铣削温度呈波动趋势变化;后角增大,铣削力减小,铣削温度先减小后增大;螺旋角增大,最大轴向力增大,最大切向力缓慢减小,最大径向力基本不变,铣削温度先减小后增大。通过正交试验和极差分析,明确不同因素对指标影响程度的主次顺序和因素的最优水平组合。

During the milling process of titanium alloy thin-walled parts, the cutter angle has a significant influence on the workpiece deformation, milling force and milling vibration. Extend the service life of cutting tools and reduce tool wear,milling process simulation model of Ti6 Al4 V titanium alloy thin-walled pieces is established by using ABAQUS software,with the milling force and milling temperature as evaluation index, using the single factor and orthogonal method to analyze the effects of cutting tool rake angle, relief angle and helix angle on the milling force and milling temperature, and the milling force experiment is carried out to verify the simulation results. The simulation results show that with the increase of the rake angle, the milling force decreases and the milling temperature fluctuates. With the increase of the relief angle, the milling force decreases, and the milling temperature decreases first and then increases. With the increase of helix angle, the maximum axial force increases, the maximum tangential force slowly decreases, the maximum radial force has no obvious variation, and milling temperature decreases first and then increases. Through orthogonal test and range analysis, the order of primary and secondary influence degree of different factors on indexes and the optimal level combination of factors are defined.