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Numerical control machine tool X-Y working table positioning error real-time compensation method based on DSP

A positioning error, numerical control machine tool technology, applied in program control, computer control, general control system, etc., can solve the problems of poor real-time compensation, complex mathematical expression of positioning error model, low compensation accuracy, etc., to improve prediction accuracy and reduce The effect of modeling difficulty and fast computing power

Inactive Publication Date: 2018-12-07
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a real-time compensation method for the positioning error of the X-Y workbench of a CNC machine tool based on DSP, which can overcome the complex mathematical expressions of the positioning error model of the existing CNC machine tool, low compensation accuracy, and poor real-time compensation. a simple and effective method

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  • Numerical control machine tool X-Y working table positioning error real-time compensation method based on DSP
  • Numerical control machine tool X-Y working table positioning error real-time compensation method based on DSP
  • Numerical control machine tool X-Y working table positioning error real-time compensation method based on DSP

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[0034] A DSP-based real-time compensation method for X-Y worktable positioning errors of CNC machine tools, characterized in that the method includes the following steps: Step 1 analyzes the reasons for the positioning errors of the X-Y worktables of CNC machine tools and the working principle of the GA-BP neural network, and determines the input and output signal; Step 2 measures the positioning error of the X-Y workbench under different influencing factors by a laser interferometer; Step 3 designs a GA-BP neural network with a variable number of individuals, genetic algebra, and hidden layers, thereby determining the X-Y of the CNC machine tool The network structure of the positioning error of the workbench; Step 4, program and train the GA-BP algorithm in MATLAB to obtain the optimal weight and threshold; Step 5, according to the optimal weight and threshold, establish the CNC machine tool positioning error compensation in DSP Model; step 6 implements the GA-BP neural networ...

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Abstract

The invention relates to a numerical control machine tool X-Y working table positioning error real-time compensation method based on DSP. A laser interferometer is applied to measure the positioning error of a numerical control machine tool X-Y working table at different speeds and positions, a GA-BP neural network is established in MATLAB to train the measured data, the positioning error modelingand prediction in the DSP according to the weight and the threshold value optimized by training. According to the method, the modeling difficulty is simplified through GA-BP neural network modeling,so that the compensation precision is improved; according to the powerful operational capability of the DSP, the GA-BP positioning error model is transplanted into the DSP, so that the system meets the requirements of real-time compensation.

Description

technical field [0001] The invention relates to the technical field of precision machining or error compensation, in particular to a DSP-based real-time compensation method for positioning errors of an X-Y workbench of a numerically controlled machine tool. Background technique [0002] With the rapid development of modern machinery manufacturing technology, the demand for high-precision products has greatly increased, which in turn puts forward higher requirements for the processing speed and precision of CNC machine tools. The X-Y table is an important part of the CNC machine tool. Its positioning accuracy is the main source of affecting the machining accuracy of the machine tool. Its positioning error is affected by factors such as position, movement speed, assembly accuracy of each component, friction and wear. At present, the commonly used modeling methods include least square method, multi-body system theory, homogeneous coordinate transformation method, orthogonal pol...

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Application Information

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IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/35408
Inventor 顾嘉辉江磊王彭通李莉
Owner ANHUI UNIV OF SCI & TECH
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