[1]陈良骥..五轴CNC系统中有效降低非线性误差的两种方法[J].郑州大学学报(工学版),2009,30(02):107-111.[doi:10.3969/j.issn.1671-6833.2009.02.026]
　CHEN Liangji..Two methods to effectively reduce nonlinear errors in five-axis CNC systems[J].Journal of Zhengzhou University (Engineering Science),2009,30(02):107-111.[doi:10.3969/j.issn.1671-6833.2009.02.026]

点击复制

五轴CNC系统中有效降低非线性误差的两种方法()

分享到：

《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:

30卷

期数:

2009年02期

页码:

107-111

栏目:

出版日期:

1900-01-01

文章信息/Info

Title:

Two methods to effectively reduce nonlinear errors in five-axis CNC systems

作者:

陈良骥.

郑州航空工业管理学院机电工程学院,河南,郑州,450015

Author(s):

CHEN Liangji.

关键词:

计算机数控;  五轴线性插补;  刀尖轨迹;  非线性误差

Keywords:

Computer numerical control;  five-axis linear interpolation;  knife tip trajectory;  Nonlinearity error

DOI:

10.3969/j.issn.1671-6833.2009.02.026

文献标志码:

A

摘要:

针对五轴数控(CNC)加工由于刀具摆动使得刀尖运动存在的非线性误差问题,建立了该误差的数学模型,提出了两种有效降低该误差的方法:第一种方法对理想线性刀尖轨迹而非数控程序段给定的数据进行插补,对插补点进行坐标变换计算插补器输出的运动控制命令;第二种方法对数控程序段直接插补但将该点对应的刀尖点投影到理想刀尖轨迹上,将投影点进行坐标变换计算机床各轴运动坐标.实例计算表明,利用所提出的方法能将非线性摆动误差降低到1μm以下,且计算时间(35.6μs)满足数控系统实时性要求.

Abstract:

Aiming at the problem of nonlinear error in the movement of the tool tip due to the swing of the tool in five-axis numerical control (CNC) machining, a mathematical model of the error is established, and two methods to effectively reduce the error are proposed: the first method imputes the ideal linear tool tip trajectory instead of the data given by the NC program segment, and performs coordinate transformation on the interpolation point to calculate the motion control command output by the interpolator; The second method directly imputes the NC program segment, but projects the tool tip point corresponding to the point onto the ideal tool tip trajectory, transforms the projection point into coordinates, and coordinates the motion coordinates of each axis of the computer bed. Example calculations show that the proposed method can reduce the nonlinear swing error to less than 1μm, and the calculation time (35.6μs) can meet the real-time requirements of the numerical control system.

常用功能