关键词: 五轴数控系统, 鞋楦加工, 刀具半径补偿, 法向量

Abstract: In the absence of the cutting contact information,using the cutting center point's normal vector as the tool radius compensation direction may cause poor surface quality of the workpiece.To improve the surface quality of workpiece,a global normal vector smoothing method was proposed.The normal vector was obtained by fitting the plane.The direction of normal vector was adjusted by the direction of former cutter center point's normal vector,so as to achieve the consistency adjustment of the normal vector direction.For the problem of large deviation for adjacent normal vector direction,the abnormal normal vector which was not perpendicular to the current cutting point plane and which had a large deviation from the normal point vector in Z direction was respectively zeroed.The smooth transition of the global normal vector was realized with linear interpolation.Vericut simulation showed that the compensation accuracy was improved and the surface of the workpiece was smooth after normal vector smoothing,which verified the effectiveness of the proposed algorithm.

Key words: five-axis CNC system, shoe last processing, tool radius compensation, normal vector