PCD木工圆锯片应力模拟分析

The Simulation Analysis of Stress of Polycrystalline Diamond Wood Cutting Tools

PCD木工圆锯片的锯齿结构参数直接影响其加工的表面质量及刀具寿命。本文采用有限元分析方法对不同结构参数的ф300 mm PCD木工圆锯片在切深ap10 mm,转速1 000 rpm切割条件下的应力状况进行了计算机模拟分析。结果表明,当前角γ固定为15°,后角α从12°增加到15°、18°,最大拉应力和最大压应力增加均小于5%,说明刀具后角对锯片应力的影响较小;当后角α固定为12°,前角γ从15°增加到20°,最大拉应力增加了约30%,说明增大刀具前角会显著增加锯片根部拉应力集中度;其最佳结构设计为前角γ=15°、后角α=12°,此时PCD圆锯片具有最小的受力状况。

The structure parameters of PCD wood cutting circular saw blade directly affect the machining quality and tool life. The simulation analysis of force and stress concentration of PCD wood circular saw blades with different cutting structure parameters was carried out by finite element analysis method when cutting with cutting depth ap10 mm and rotation speed 1 000 rpm. The results show that both the maximum tensile stress and compressive stress concentration increase are less than 5% as the clearance angle α increases from 12° to 15° and 18° when the rake angle γ is fixed at 15°, indicating that the clearance angle has little influence on the maximum stress concentration. The maximum tensile stress increase is more than 30% as the rake angle γ increases from 15° to 18° when the clearance angle α is fixed at 12°, indicating that the rake angle greatly influences the maximum stress concentration of PCD wood cutting circular saw blades. Therefore the optimal cutting structure parameters are rake angle γ of 15° and clearance angle α of 12° in the experiment.