Curved surface tool path contour error compensation method based tool location point correction

基于刀位点修改的曲面刀轨轮廓误差补偿方法

Abstract

The invention belongs to the field of numerical control machine tool dynamic error compensation and relates to a novel contour error estimation method, particularly to a curved surface tool path contour error compensation method based tool location point correction. The method comprises, on the basis of identifying the servo gain of a machining feed shaft control system, estimating practical machining points off line according to a following error model and linear interpolation machining codes; estimating contour error vectors according to a method similar to accumulated chord length parametric cubic spline of ideal tool paths; computing the contour error compensation according to the components of the contour error vectors on every axis to obtain compensated tool location points and further to generate linear interpolation numerical control machining codes for practical machining. The curved surface tool path contour error compensation method based tool location point correction can improve the dynamic precision of a numerical control machine tool and is high in precision, stable in computation, free from online measurement, easy to implement and wide in application range.
本发明基于刀位点修改的曲面刀轨轮廓误差补偿方法属于数控机床动态误差补偿领域,涉及一种轮廓误差估计新方法和基于刀位点修改的曲面刀轨轮廓误差补偿新方法。该方法在辨识加工进给轴控制系统伺服增益的基础上,根据随动误差模型和直线插补加工代码,离线估计实际加工点;利用理想刀轨“累加弦长参数三次样条”近似的方法估计轮廓误差矢量;再利用轮廓误差矢量在各轴的分量计算轮廓误差补偿值,得到补偿后刀位点,进而生成补偿后直线插补数控加工代码,用于实际加工。该方法是提高数控机床动态精度的刀轨轮廓误差补偿方法,精确度高,计算过程稳定,无需在线测量。便于实施,适用范围广。

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (5)

    Publication numberPublication dateAssigneeTitle
    CN-102591257-AJuly 18, 2012山东理工大学Parameter curve cutter path oriented numerical control system contour error control method
    CN-102785166-ANovember 21, 2012华中科技大学Kinematic transformation based grinding machining method for numerically controlled grinding wheel
    CN-1888992-AJanuary 03, 2007王敏, 赵玉刚, 单东日Variable separation orthometric subalgebric curve composition difference interpolating digital processing method
    JP-H06282321-AOctober 07, 1994Shin Nippon Koki Kk, 新日本工機株式会社工作機械の数値制御プログラム変換作成方法及び装置並びに数値制御工作機械
    US-5208763-AMay 04, 1993New York UniversityMethod and apparatus for determining position and orientation of mechanical objects

NO-Patent Citations (0)

    Title

Cited By (3)

    Publication numberPublication dateAssigneeTitle
    CN-105234743-AJanuary 13, 2016天津大学Deflection error compensation method for five-axis machining center tool
    CN-105242637-AJanuary 13, 2016华中科技大学一种航空薄壁叶片补偿加工方法
    CN-105759726-AJuly 13, 2016大连理工大学基于轮廓误差约束的自适应曲线插补方法