基于刀具跳动的非可展直纹面侧铣加工刀位优化方法

Cutter Position Optimization Method Based on Tool Runout for Flank Milling of Non-Developable Ruled Surface

在非可展直纹面的侧铣加工过程中,曲面的非可展的特性会影响加工后零件的表面质量。尤其在铣削软材料工件非可展直纹面时,刀具跳动是零件表面加工误差增大的新因素。针对这一问题,课题组提出了一种基于刀具跳动的非可展直纹面侧铣加工刀位优化方法。首先构建了刀具跳动下的误差度量函数;随后通过测量法得到了刀具跳动后的实际回转轮廓半径;最后在考虑刀具跳动的情况下通过单点摆动法对初始刀位进一步优化。仿真实验结果表明:在将刀具跳动因素加入非可展直纹面的误差优化模型中后,加工平均误差减小了25%,过切率减小了18.5%。该研究方法有效提高了零件的表面质量。

In the flank milling process of non-developable ruled surface,the non-developable characteristic of curved surface will affect the surface quality of the processed parts.The tool run-out is a new factor that increases the machining error on the surface of the parts,especially in the milling process of soft materials.To solve this problem,a tool position optimization method based on tool run-out for non-developable ruled surface milling was proposed.Firstly,the error measure function under the tool jumping was constructed.Then the actual radius of the tool’s rotation contour was obtained by measuring.Finally,the initial tool position was optimized by single point swing method considering tool runout.The simulation results show that when the tool run-out factor is added into the error optimization model of nondevelopable ruled surface,the average machining error is reduced by 25%and the overcutting rate by 18.5%,which effectively improves the surface quality of the parts.