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Method for reducing three-shaft linkage contour error

A contour error and three-axis linkage technology, which is applied in the direction of instruments, computer control, simulators, etc., can solve the problems of the difficulty in implementing highly integrated CNC machine tools and the inability to reduce multi-axis linkage contour errors, etc.

Active Publication Date: 2015-09-09
DALIAN UNIV OF TECH
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Problems solved by technology

However, this method not only requires an accurate model of the servo feed system, but also needs to change the structure of the CNC system and add a compensator, which is difficult to implement for highly integrated CNC machine tools; in addition, this method is mainly used to compensate for servo parameter mismatch induced The contour error of the machine tool cannot reduce the multi-axis linkage contour error generated by the feed axis of the machine tool in the continuous path operation mode

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  • Method for reducing three-shaft linkage contour error
  • Method for reducing three-shaft linkage contour error
  • Method for reducing three-shaft linkage contour error

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Embodiment Construction

[0047] The specific implementation manner of the present invention will be described in detail in conjunction with the technical scheme and the accompanying drawings.

[0048] When using high feed speed to process complex curved surface parts, due to the existence of variable curvature tool rails, the dynamic characteristics of CNC machine tools, the mechanical inertia of the processing feed axis and other factors, there will be a large follow-up error and the actual processing feed speed is very easy to reach The phenomenon that the speed value is less than the command speed value will induce multi-axis linkage contour error, which is not conducive to the precise and efficient machining of complex curved surface parts with variable curvature. Accordingly, aiming at the multi-axis linkage contour error in high feed rate machining, a method to reduce the three-axis linkage contour error was invented.

[0049] Taking the space star line tool path represented by non-uniform ratio...

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Abstract

The invention discloses a method for reducing a three-shaft linkage contour error, belongs to the field of precision efficient machining of complex curved parts, and relates to a method for reducing the three-shaft linkage contour error of a numerical control machine tool in combination with machining feed speed re-planning and contour error pre-compensation. The method comprises the steps of firstly extracting machining feed speed and ideal cutter location information from numerical control codes, and re-planning the machining feed speed of each program section in a numerical control program by using the accelerated acceleration limit and the acceleration limit of each machining feed shaft as restraint conditions; estimating a contour error value by using an accumulated chord length parametric spatial cubic spline similar desired contour method; calculating the contour error compensation quantity of each feed shaft by using a Taylor series expansion method to obtain a pre-compensated cutter location; and iteratively cycling the above processes to obtain a pre-compensated machining code, thus realizing high-quality and high-efficiency machining of complex curved parts. The method is simple and practical, and can sufficiently exert the performance of the numerical control machine tool and improve the multi-shaft linkage contour precision.

Description

technical field [0001] The invention belongs to the field of precision and high-efficiency machining of complex curved surface parts, and particularly relates to a method for reducing three-axis linkage contour errors by combining machining feed rate replanning and multi-axis linkage contour error pre-compensation. Background technique [0002] Variable curvature surface parts with complex surface structures are widely used in the field of high-end equipment. With the rapid development of major engineering fields and the continuous advancement of the mass production process of high-end equipment, such key complex curved surface parts not only have extremely high requirements for contour accuracy, but also have an increasing demand for production efficiency. In order to improve processing efficiency, many high-end CNC machine tools can provide greater main motion and processing feed motion speed. However, due to the hysteresis characteristics of the servo feed system of the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/404
CPCG05B19/404
Inventor 马建伟王福吉宋得宁贾振元高媛媛
Owner DALIAN UNIV OF TECH
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