An Adaptive Real-time Compensation Method for Follow-up and Contour Errors

A contour error and real-time compensation technology, which is applied in the direction of instruments, computer control, simulators, etc., can solve the problems that it is difficult to effectively guarantee the stability of the system, it is difficult to ensure the estimation accuracy, and the effect of contour control is affected.

Active Publication Date: 2018-08-07
DALIAN UNIV OF TECH
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Problems solved by technology

However, when the following error of each motion axis is large, the existing contour error estimation method is difficult to guarantee the estimation accuracy, which affects the contour control effect. In addition, due to the time-varying gain of the cross-coupled controller, the stability of the system is difficult to be effectively guaranteed.

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  • An Adaptive Real-time Compensation Method for Follow-up and Contour Errors

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[0038] The specific implementation manner of the present invention will be described in detail in conjunction with the technical scheme and the accompanying drawings.

[0039] In the process of direct interpolation of the parameter curve, due to the reasons such as servo lag and external disturbance in the control system of each feed axis, it will cause a large single-axis motion follow-up error and multi-axis linkage contour error. In order to improve the machining accuracy, we invented a A method for adaptive real-time compensation of follow-up and contour errors.

[0040] attached figure 1 Schematic diagram of the structure of the adaptive real-time compensator for follow-up and contour errors, with figure 2 The geometric model diagram of the curved tool path is attached 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-uniform rational ...

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Abstract

The invention discloses a follow-up and contour error adaptive real-time compensation method, belongs to the technical field of precise and efficient intelligent numerical-control machining, and relates to a feed system online identification based follow-up error adaptive compensation method and high precision contour error real-time estimation based contour error compensation method. The method includes: performing on-line identification on a numerical-control feed system by adopting a least square method; according to identification results, performing adaptive follow-up error compensation; according to actual cutter location point, calculating contour error estimate value; performing further direct compensation on the contour error to realize simultaneously improvement in follow-up and contour precision. With the method, single-axis tracking precision and multi-axis linkage machining contour precision of a numerical-control machine tool can be improved, error decreasing effect is good, high adaptability is achieved, and great importance is achieved in improving numerical-control machine tool machining precise and realizing precious and efficient machining on complex-curved surface parts.

Description

technical field [0001] The invention belongs to the technical field of precision, high-efficiency, and intelligent numerical control machining, and relates to a follow-up and contour error self-adaptive real-time compensation method for improving machining accuracy during parameter curve interpolation machining. Background technique [0002] As complex curved surface parts with variable curvature geometric features are widely used in major high-end equipment fields such as aerospace, energy power, and automotive molds, higher requirements are put forward for their machining accuracy and efficiency. Compared with traditional linear and circular interpolation, parametric curve interpolation technology has the advantages of higher machining accuracy, higher efficiency, and better machining quality, so it has been widely used in the field of complex curved surface parts processing. However, in the parametric curve interpolation NC machining of complex curved surface parts, due t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/35408
Inventor 马建伟宋得宁贾振元高媛媛刘振
Owner DALIAN UNIV OF TECH
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