Numerically-controlled machine tool comprehensive error three-stage optimized compensation method on basis of modifying NC program

A CNC machine tool and comprehensive error technology, which is applied in the direction of program control, computer control, general control system, etc., can solve the problems of lack of error compensation methods, machining accuracy attenuation, etc.

Active Publication Date: 2016-06-29
SICHUAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem in the prior art that there is no general error compensation method for multi-axis CNC machine tools whose machining accuracy has been greatly attenuated after long-term service

Method used

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  • Numerically-controlled machine tool comprehensive error three-stage optimized compensation method on basis of modifying NC program
  • Numerically-controlled machine tool comprehensive error three-stage optimized compensation method on basis of modifying NC program
  • Numerically-controlled machine tool comprehensive error three-stage optimized compensation method on basis of modifying NC program

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Embodiment

[0062] Below is an exemplary description of using the method of the present invention to perform error compensation on a large-scale A / B double-swing angle five-axis linkage CNC gantry milling machine. Before adopting the method of the present invention, the NC program of the workpiece numerical control machining is as follows image 3 shown.

[0063] Carry out comprehensive error measurement and identification on a large-scale A / B double-swing angle five-axis linkage CNC gantry milling machine, and establish its pose error prediction model Equation 3) as follows

[0064]

[0065] Based on the NC program of a certain type of part, when the following block is read, according to figure 2 , for error compensation.

[0066] N35X35.Y-55.Z0.

[0067] N40G00X35.Y-55.Z15.

[0068] Set the original point D 1 (X 1 ,Y 1 ,Z 1 ) and D 2 (X 2 ,Y 2 ,Z 2 ); first calculate the distance between two points, as follows

[0069] | D ...

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Abstract

The invention belongs to the field of multi-axis numerically-controlled machine tool comprehensive error compensation key technology research, and aims at solving the problem that in the prior art, a multi-axis numerically-controlled machine tool of which the machining precision is greatly reduced after being used for a long time is lack of a universal error compensation method.The invention provides a three-stage optimized numerically-controlled machine tool motion error offline compensation method, wherein three stages of optimization comprise a segmented refinement stage, a segmented optimization stage and a deep optimization stage.The method particularly comprises the following steps that on the basis of an existing NC program, a starting point position and a terminating point position of motion of a feed shaft or a main shaft are read in corresponding program lines, and segmented refinement is conducted on the track; all key point positions on the track are calculated, corresponding errors are obtained by applying a numerically-controlled machine tool position and posture prediction model, and primary optimization is conducted on the key point positions; iterative computation, taking a preset precision value as a constraint condition, is conducted on optimized point positions to achieve deep optimization.The method has good universality on multi-axis linkage numerically-controlled machine tools of different control systems.

Description

technical field [0001] The invention belongs to the key technology research field of comprehensive error compensation of multi-axis numerical control machine tools, and in particular relates to an off-line compensation method for multi-axis linkage numerical control machine tool comprehensive errors by modifying the original NC processing program. Background technique [0002] Comprehensive error compensation of multi-axis linkage CNC machine tools has always been a research hotspot in the field of CNC machining and intelligent control. The error compensation methods of CNC machine tools are mainly divided into hardware error compensation and software error compensation. The hardware error compensation method is mainly aimed at the systematic, regular and repeatable error items of CNC machine tools. By detecting the error change curve of the transmission chain of each relevant motion axis, the correction mechanism complementary to the original transmission parts is designed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/34117
Inventor 王家序王洪乐周青华熊青春杨万友周广武蒲伟
Owner SICHUAN UNIV
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