Abstract: Aiming at realizing computer-integrated manufacturing of complex surface for five-axis CNC machines with B-C axis dual rotary table,the mapping relationship between the motion coordinates of servo axis and the cutter location data was derived based on 3D model of machine tool.The transformation between translational coordinates and rotational coordinates of machine tools was calculated.To solve the problems such as tool collision or overcut arising from general post-processor in tool path setting,an equal chord-error method was adopted to optimize the cutting step length and the path interval,which could shorten the total cutting length and improve the processing efficiency.A specific post-processor was developed by using Visual C++.The simulation of machining part with complex surface was implemented with VERICUT software.The machining process performed on a real machine tool was given to demonstrate the reliability and efficiency of the presented post-processor.

Key words: five-axis CNC machines, path optimization, post-processing, virtual machining

摘要： 为实现B-C轴双转台五轴数控机床复杂曲面的计算机集成制造,在建立机床三维模型的基础上,推导了机床各轴运动坐标同刀位数据之间的映射关系,计算了机床平动坐标和回转坐标间的转换,采用等弓高误差法优化走刀步长,调整走刀行距,解决了普通后置处理器在刀具路径设置方面撞刀、过切的问题,在满足误差要求的情况下减少了刀具路径总长,提高了加工效率。采用VisualC++开发了专用后置处理器,通过VERICUT软件实现了仿真加工,并对复杂球面零件进行加工实验,验证了该后置处理器的可靠性和高效性。

关键词: 五轴数控机床, 路径优化, 后置处理, 虚拟加工