High speed interpolation for micro-line trajectory and adaptive real-time look-ahead scheme in CNC machining  

作　　者：ZHANG LiXian SUN RuiYong GAO XiaoShan LI HongBo 

机构地区：[1]Key Laboratory of Mathematics Mechanization, AMSS, Chinese Academy of Sciences, Beijing 100190, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Science China(Technological Sciences)》2011年第6期1481-1495,共15页中国科学（技术科学英文版）

基　　金：supported by the National Key Basic Research Project of China (Grant Nos 2011CB302400);the National Natural Science Foundation of China (Grant Nos 60821002, 10871195, 10925105);Major National S&T Project "Advanced CNC Systems";CAS Project "MM Methods for Advanced CNC Systems"

摘　　要：CNC machining plays an important role in mechanical manufacturing.A key issue is to improve the machining feedrate while keeping the machining precision and satisfying the acceleration constraints of the CNC machine.For the consecutive micro-line segments interpolation,the velocities at the junction of two segments are the bottlenecks for the machining efficiency.This paper proposes a multi-period turning method to improve the feedrate at the junctions using the linear acceleration and deceleration mode,which utilizes the maximal acceleration capabilities of the NC machine while satisfying the machining precision.A new and more efficient look-ahead method and a feedrate override method are also proposed to boast the global machining speed.The proposed algorithm has been implemented on Blue Sky NC System,and experimented in real material manufacturing.Compared with several existing algorithms,the current algorithm can improve the manufacturing time ranging from 50% to 180%,depending on the machining parameters,and also results in better machining quality.In addition,the algorithm also satisfies the need of real-time interpolation.

关 键 词：CNC micro-line segment multi-period turning look-ahead scheme real-time interpolation feedrate override 

分 类 号：TG659[金属学及工艺—金属切削加工及机床] TP273.2[自动化与计算机技术—检测技术与自动化装置]