基于残留高度球刀铣削粗糙度建模及参数优化∗

摘要

基于P20模具钢数控球刀铣削试验，对表面粗糙度的影响因素进行了研究。在试验数据极差分析的基础上得出了如下结论：加工残留高度是球刀铣削粗糙度最重要的影响因素。基于试验数据，利用最小二乘多元线性回归方法，推导并求解出P20模具钢球刀铣削粗糙度的数学模型。利用最优化设计方法和MATLAB优化工具箱，以加工效率为目标函数和以粗糙度预测模型为约束条件，针对实际的问题优选了铣削工艺参数。优化的工艺参数在保证表面加工质量的基础上可大幅提高加工效率，这为数控加工企业降低生产成本提供了重要的理论依据和案例参考。%The affecting factors on surface roughness are studied based on NC milling tests with ball-end cut-ters for P20 mould steel. Based on the analysis of the test data conclusions are as follows:scallop height is the most important influencing factors of surface roughness for ball-end cutters milling. Based on the experi-mental data, the mathematical model of surface roughness with ball-end cutters milling for P20 mould steel is derived and solved by using of regression analysis method of least square. Aiming at the actual milling problem the cutting parameters are optimized by using of optimum tool-box of MATLAB software and opti-mal design method. The optimized cutting parameters can greatly improve the machining efficiency ensuring quality of the machined surface, it provides the important theory evidence and case reference for NC machi-ning enterprises to reduce production costs.