An Adaptive Variable Gain Contour Error Compensation Method

A contour error and compensation method technology, applied in program control, instrument, computer control, etc., can solve problems such as difficulty in ensuring compensation control effect, and achieve the effect of improving contour tracking, balance smoothness, and good estimation accuracy

Active Publication Date: 2018-12-21
DALIAN UNIV OF TECH
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Problems solved by technology

However, the controller uses a fixed gain value, and it is difficult to guarantee a good compensation control effect at any position on the free curve.

Method used

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  • An Adaptive Variable Gain Contour Error Compensation Method
  • An Adaptive Variable Gain Contour Error Compensation Method
  • An Adaptive Variable Gain Contour Error Compensation Method

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Embodiment Construction

[0039] The specific implementation manner of the present invention will be described in detail in conjunction with the technical scheme and the accompanying drawings.

[0040] In the process of direct interpolation of parameter curves in CNC machining, due to servo lag and external disturbances in the control system of each feed axis, large contour errors will be caused. In order to improve the contour tracking performance and further improve the machining accuracy of CNC machine tools, we invented a Adaptive variable gain contour error compensator.

[0041] attached figure 1 It is a schematic diagram of the structure of the adaptive variable gain contour error compensator, with figure 2 It is the geometric model diagram of the curved tool path in the Cartesian coordinate system, with figure 2 The shown non-uniform rational B-spline curve tool path profile is an example, and the specific implementation process of the present invention is described in detail. The non-unifor...

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Abstract

The invention provides a self-adaptive variable gain outline error compensation method belonging to the technical field of precise efficient and intelligent numerical control machining and relates to a non-linear variable gain outline error compensation method used for improving outline tracking precision of a numerical control system in a parameter curve interpolation numerical control machining process. According to the invention, based on a geometric position relation between a free curve generated by a numerical control parameter curve interpolator and an actual cutter location point, the nearest perpendicular point to the actual cutter location point on a curve outline is found quickly by utilizing a tangential error inversing strategy, so that high precision estimation of an outline error vector is realized further. By utilizing the estimation result, based on the magnitude of the outline error vector and the direction change degree of the outline error vector, self-adaptive calculation of reasonable compensation gain is performed, so that effect compensation of outline errors is realized. The invention can effectively realize balance between the response speed of outline error compensation and the smoothness of a compensation track, and further improves the outline tracking performance of the numerical control system. The invention has great significance to the improvement of the machining precision of a numerical control machining bed.

Description

technical field [0001] The invention belongs to the technical field of precision, high-efficiency, and intelligent numerical control machining, and relates to an adaptive variable-gain contour error compensation method for improving machining accuracy during parameter curve interpolation machining. Background technique [0002] Contour tracking is an important task for CNC machine tools to realize the processing of complex curved surface parts. The contour tracking accuracy of CNC system directly affects the machining accuracy of CNC machine tools. Due to the existence of factors such as the servo lag of the single-feed axis servo control system, the mismatch of dynamic characteristics of multiple feed axes, and external random disturbances, contour errors will occur between the actual running track and the ideal track during high-speed CNC feed motion. , which is defined as the vertical distance from the actual tool position to the ideal contour. This error is not conduciv...

Claims

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Application Information

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IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/35408
Inventor 马建伟宋得宁贾振元胡国庆赵孝轩王福吉
Owner DALIAN UNIV OF TECH
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