Adaptation of feed rate for 3-axis CNC high-speed machining  

作　　者：张得礼 周来水 

机构地区：[1]College of Mechanical and Electrical Engineering,Nanjing University of Aeronautic and Astronautic

出　　处：《Journal of Harbin Institute of Technology(New Series)》2009年第3期391-395,共5页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Excellent Young Teacher Encouragement Plan of China

摘　　要：To improve the efficiency of CNC machining, assumptive transit circular arc is used to contour two adjacent moves together on the comer to make smooth paths. The radios of transit circular arc can be adjusted with contour accuracy, and the feed rate on the corner can be controlled through limiting the maximum feed rate of transit circular arc segment. A look-ahead algorithm for a series of moves is proposed for speed adjustment in advance, which avoids the occurrence of overload of cutting tool on the comer and reduces the servo track error of parts on the corner or of circular arc move. Equivalent trapezoidal velocity profile is used to analyze the speed of S-curve velocity profile and work out its accurate interpolation, which overcomes the disadvantage of looking up table to calculate feed rate approximately, hence high accuracy and fine surface quality can be obtained while the machining speed is high. The proposed methods can meet the requirements of real-time analysis of high-speed machining. The presented algorithm is effective and has been adopted by CNC system of newly developed high-speed milling machine.To improve the efficiency of CNC machining,assumptive transit circular arc is used to contour two adjacent moves together on the corner to make smooth paths. The radius of transit circular arc can be adjusted with contour accuracy,and the feed rate on the corner can be controlled through limiting the maximum feed rate of transit circular arc segment. A look-ahead algorithm for a series of moves is proposed for speed adjustment in advance,which avoids the occurrence of overload of cutting tool on the corner and reduces the servo track error of parts on the corner or of circular arc move. Equivalent trapezoidal velocity profile is used to analyze the speed of S-curve velocity profile and work out its accurate interpolation,which overcomes the disadvantage of looking up table to calculate feed rate approximately,hence high accuracy and fine surface quality can be obtained while the machining speed is high. The proposed methods can meet the requirements of real-time analysis of high-speed machining. The presented algorithm is effective and has been adopted by CNC system of newly developed high-speed milling machine.

关 键 词：CNC feedrate smoothing S-curve velocity profile high-speed machining 

分 类 号：TG659[金属学及工艺—金属切削加工及机床] V211.19[航空宇航科学与技术—航空宇航推进理论与工程]