数控铣削加工中心加工精度分布规律

以正交试验设计理论为依据，结合数控加工技术的特点，给出了数控铣削加工中心加工精度分布规律的正交试验设计方案，进行变直径凸轮铣削加工试验.根据试验数据用Matlab对凸轮的线轮廓进行模拟，验证了数控铣削加工的线轮廓度误差符合正态分布规律；用极差分析法对加工误差较大的两处轮廓R2和R5进行线轮廓度误差分析，研究加工参数对其影响的显著性差异.在设计同一零件的不同弧段的轮廓度公差时所选定的值应该是不同的.

Machining Accuracy Distribution Regularities of CNC Milling Machining Center

To test the machining accuracy distribution of CNC milling machining center， an orthogonal experimental scheme was presented on the basis of the orthogonal test design theory and the characteristics of CNC machining technology. The scheme was used to machine variable diameter cams and then the line profiles of the cams were simulated using Matlab. The results showed that the line profile accuracy has a normal distribution. The relatively larger line profile errors， R2 and R5， were analyzed using the extreme difference analysis method in order to study the influence of machining parameters. The profile tolerance value should be different for every arc of the same part.