实轴空间综合约束下的数控加工速度前瞻策略  

CNC Machining Velocity Look-Ahead Strategy Restricted by Machine Axis Drive Ability

作　　者：赵鹏[1] 楼佩煌[1] 刘明灯 满增光[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]南京四开电子企业有限公司,南京210007

出　　处：《西安交通大学学报》2012年第2期64-69,共6页Journal of Xi'an Jiaotong University

基　　金：江苏省科技支撑计划资助项目(BE2011182);江苏省重大科技成果转化专项资金资助项目(BA2007071);江苏省产学研前瞻性联合研究项目(BY2009102)

摘　　要：为了避免数控高速加工中由高曲率区域引起的机床驱动轴的运动突变、机床振动和工件过切,提出了基于实轴空间综合约束的数控加工速度前瞻控制策略.该方法应用切削运动的S形曲线速度规划方案,对机床实轴运动数据进行速度、加速度、冲击约束检测,整体提前寻优确定S形速度前瞻的过程参数,并提出了速度规划节点分离法对切削路径进行分段独立S形曲线速度的规划.仿真和试验表明,采用该方法进行速度前瞻处理时,可使加工速度平滑连续,不仅消除了各驱动轴运动突变引起的冲击振动,而且有效地解决了五轴数控加工中的速度控制问题,因此降低了曲面轮廓误差,满足了高速高精度的加工要求.In high curvature region of high speed computer numerical control（CNC） machining,machine axis motion shock,mechanical vibration and cutting overshoots often occur.A novel CNC machining velocity look-ahead strategy based on machine axis drive ability constriction is proposed.The S-curve velocity planning is utilized,and the velocity planning parameters are achieved by checking the velocity,acceleration and jerk of the rotate axis and linear axis on the tool path.Then a velocity control node subsection is suggested to divide the cutting path into independent sections to implement the velocity planning independently.The simulation and experiments demonstrate that the strategy enables to smooth the cutting motions and obviously improve the machining surface quality,and 5-axis CNC velocity control is thus effectively solved to meet the high performance requirements in free-form surface machining.

关 键 词：数控 前瞻控制 S形曲线 速度规划 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]