VAMT1Y虚拟轴机床数控系统直线和圆弧插补仿真研究

介绍虚拟轴机床原型样机ＶＡＭＴ１Ｙ的圆弧和直线插补，并对插补误差进行分析。分析表明，该插补算法具有足够的精度，完全可以满足加工需求；还得出工作空间中插补误差的敏感因素，为高精度的刀具轨迹规划提供依据。

Interpolation Scheme and Simulation Study on Its Accuracy for a Stewart Platform Based CNC Machine Tool VAMT1Y

An interpolation scheme for a 6 DOFs Stewart platform based CNC machine tool has been provided in this paper. The trajectory is divided into segments in Cartesian coordinate and then is transmitted into control commands in joints space composed of six legs by the kinematics of parallel mechanism. The scheme can ensure the control points on the desired trajectory, but the real trajectory between two control points depends on the method adopted to cut each segment by legs, consequently the interpolation error occured because of the parallel mechanism. So the interpolation accuracy and sensitive factors on VAMT1Y (A Stewart platform based CNC machine tool developed by the Mechanical Engineering Institute of Tsinghua Univ. and the Mechanical Engineering School of Tianjin Univ., 1997) has also been analyzed by simulation. It has been proved that the scheme adopted in this paper has enough precision to perform routine machining task.