面向微线段高速加工的拐角曲线过渡插补算法  

Corner Curve Transition Interpolation Algorithm for High Speed Machining of Micro-line Segment

作　　者：张晓辉[1,1] 于东[1] 杨东升[1] 胡毅[1,1] 韩文业[2] 

机构地区：[1]中国科学院研究生院,北京100039 [2]沈阳高精数控技术有限公司,沈阳110004

出　　处：《机械工程学报》2010年第19期183-191,共9页Journal of Mechanical Engineering

基　　金：国家科技重大(2009ZX04009013);中国科学院知识创新工程重要方向(KGCX2-YW-119)资助项目

摘　　要：针对微小线段高速加工的需求,在分析现有微小线段转接过渡算法不足的基础上,通过建立拐角曲线过渡矢量模型,探讨轮廓加工精度、相邻线段长度和夹角以及过渡曲线弧长和最大曲率之间的关系。并以此为基础,提出一种基于拐角曲线过渡的微小线段插补算法。该算法根据上述模型确定出相邻线段间既符合轮廓加工精度和微小线段自身长度,又满足转接处曲率连续的拐角过渡曲线,以此来提高相邻线段间的转接速度;计算出受弦高误差和机床机械特性限制的加工速度极小值点以及该点所允许的最大加工速度;通过对相邻速度极小值点间的加工速度进行自适应调整,以提高微小线段的整体加工速度。研究结果表明,该算法可有效地提高相邻微小线段间的转接速度,并大大缩短整体加工时间。该算法已成功地应用于高速雕铣机数控系统中。The existing micro-line block interpolation algorithm can not meet the need of high speed machining.Through building the vector model of corner curve transition,the relation between contour machining accuracy,adjacent line segment length and included-angle,transition curve arc length and maximum curvature is given.Based on them,a micro-line segment interpolation algorithm based on corner curve transition is proposed.According to this algorithm,the transition curve parameterized by path distance is used to connect adjacent micro-line segment with continuous curvature.At the same time,the maximum allowable velocity limited by chord error and mechanical property of machine tool is calculated and automatically adjusted.So the machining efficiency can be improved while the machining accuracy and quality ensured.The experimental results show that the proposed algorithm can efficiently improve transition speed and dramatically reduce machining time.It is successfully applied in NC systems of high speed engraving and milling machines.

关 键 词：高速加工 微小线段 拐角曲线过渡 插补算法 

分 类 号：TG156[金属学及工艺—热处理]