假肢接受腔阳模刀位插补方法及其误差比较

在分析假肢接受腔阳模数控加工特点的基础上,针对三坐标数控铣加工,讨论了直接法、退刀法、矢量法三种典型刀位计算方法在接受腔阳模加工中的应用,分析了加工误差的来源及其分布,并给出了逼近误差和刀具补偿误差的计算方法。通过加工实验,验证了三种刀位计算方法的有效性和误差分析方法的正确性。实验结果表明:直接法简单,但加工误差大,只适合于粗加工;退刀法复杂,加工误差大,不适用;矢量法复杂,误差小,适用于阳模加工刀位的插补计算。

Cutter Location Interpolation Methods and Error Analysis for Prosthetics Socket Machining

Based on the analysis of NC machining features for the prosthetics socket,three typical interpolation methods,i.e.,the direct method,the fall back cutter method and the vector method, were discussed in the application of the socket mold machining with the 3-axis NC milling machine. The error sources and the error distribution were analyzed,and the calculation method of approxima- tion error and cutter compensation error were discussed specifically.The validity of three methods and the correctness of the error calculation were proved in the machining experiments.The experimental results has shown that the direct method is simple with the high machining error which makes it only suitable for the rough machining;the fall back cutter method is complex and the high machining error which makes it unsuitable for the socket machining system;the vector method is complex with the low machining error which makes it suitable for the system.