摘要
数控加工中的连续微小直线段的加工,主要是通过微段间连接处的速度来制约加工速度,在满足加工精度和加速度的前提下,要尽可能提高加工速度。为了减少加速度震荡,采用Cardinal样条曲线过渡的方式,通过建立拐角曲线过渡矢量模型,得出弦高误差、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,从而确定满足条件的拐角过渡曲线,并通过弦高误差和机床机械特性以及曲率确定所允许的最大加工速度。同时给出了一种基于S型加减速的自适应前瞻算法,从而实现了微段间速度的高速衔接。仿真结果表明,该算法能够提高相邻线段间的转接速度,实现速度和加速度的平滑过渡。
In CNC systems,the continuous micro-line segments are mainly through the speed of the connection between the micro-line to control the processing speed.So in the premise of meeting the processing accuracy and acceleration,we need to improve processing speed as much as possible.In order to reduce the acceleration shock,the Cardinal spline curve is adopted to transit between micro-lines.Through building the vector model of corner curve transition,the relationship between chord error,adjacent line segment length and included-angle,transition curve are length and maximum curvature is given.So the corner curve transition and the maximum allowable velocity limited by chord error and mechanical property of machine tool is confirmed.At the same time,an adaptive forward-looking algorithm is propose,which realizes the high speed convergence between micro segments.The simulation results show that this algorithm can improve the transition speed between adjacent lines and realize the smooth transition of velocity and acceleration.
作者
袁家兰
黄艳
盖荣丽
YUAN Jia-lan;HUANG Yan;GAI Rong-li(Graduate University of Chinese Academy of Science,Beijing 100039,China;National Engineering Research Center for High-End CNC,Shenyang Institute of Computing Technology,Chinese Academy of Science,Shenyang 110168,China)
出处
《组合机床与自动化加工技术》
北大核心
2018年第10期1-5,共5页
Modular Machine Tool & Automatic Manufacturing Technique
基金
自然科学基金项目:复杂曲面高质量加工中的插补算法研究(61602074)
