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Control method for motion stability and outline machining precision of multi-shaft linkage numerical control system

A numerical control system and multi-axis linkage technology, applied in the field of numerical control, can solve problems such as poor stability of motion and affecting contour accuracy

Active Publication Date: 2014-01-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0006] The purpose of the present invention is to propose a multi-axis linkage numerical control system for the problem that the speed planning and servo control process of the existing multi-axis numerical control system are carried out independently of each other. The control method of system motion stability and contour processing accuracy, it uses the multi-axis linkage CNC system interpolation process and position servo control as a system, organically combines the theoretical calculation of the interpolation stage and the multi-axis linkage position servo control to ensure the movement as much as possible It moves according to the trajectory planned by the speed, so as to ensure the stability and contour accuracy of the multi-axis linkage CNC system

Method used

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  • Control method for motion stability and outline machining precision of multi-shaft linkage numerical control system
  • Control method for motion stability and outline machining precision of multi-shaft linkage numerical control system
  • Control method for motion stability and outline machining precision of multi-shaft linkage numerical control system

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[0102] Illustrate the specific implementation mode of the present invention with an example as follows:

[0103] Such as Figure 1-14 shown.

[0104] A method for controlling motion stability and contour machining accuracy of a multi-axis linkage numerical control system, comprising the following steps:

[0105] (1) Establish a multi-axis servo control system model. Due to the influence of factors such as environmental changes and external disturbances, the multi-axis linkage position servo control system has certain characteristics such as nonlinearity, uncertainty and time-varying. Only using the linear model as the mathematical model of the servo control system, there must be model errors. Since the nonlinearity, uncertainty and time-varying nature of the control system are difficult to describe with an accurate mathematical model, in order to accurately describe the mathematical model of the multi-axis linkage position servo control system, the system model is decompose...

example

[0234] A method for controlling motion stability and contour machining accuracy of a multi-axis linkage numerical control system includes the following steps:

[0235] (1) Establish a multi-axis servo control system model. In order to accurately describe the mathematical model of the multi-axis linkage position servo control system, the system model is decomposed into two parts: the known linear model and the unknown nonlinear model. System identification is carried out on the linear model, and the mathematical model of the linear system is obtained as follows:

[0236] x ( k ) = 0.4761 x ( k - 1 ) + 0.2502 x ...

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Abstract

The invention discloses a control method for motion stability and outline machining precision of a multi-shaft linkage numerical control system. The control method achieves control on the motion stability and outline machining errors of the multi-shaft linkage numerical control system by using a compound control mode of multi-shaft parameter module predictive control and non-linear self-adaptive fuzzy proportional-integral-derivative (PID) control. Simultaneously, error module calculating efficiency is improved by building an outline error module, a speed error module and an acceleration error module. By means of performance optimization indexes, tracking errors, outline errors, speed errors and acceleration errors of the system are minimum, and control performance of a multi-shaft servo control system is improved. Multi-shaft parameter module predicative control increment is solved through a simplified calculating module so as to meet real-time requirements of the control system. Robust property of the multi-shaft linkage numerical control system is improved by adopting the non-linear self-adaptive fuzzy PID control method. The control method effectively improves the motion stability and outline machining precision of the multi-shaft linkage numerical control system.

Description

technical field [0001] The invention relates to the technical field of numerical control, in particular to a multi-axis linkage numerical control system technology, in particular to a multi-axis linkage numerical control system motion stability and contour processing precision control method. Background technique [0002] The motion stability and contour machining accuracy of multi-axis linkage CNC system are one of the key elements to ensure the machining accuracy of CNC machine tools. With the development of advanced manufacturing technology, high-speed and high-precision CNC machine tools put forward higher requirements for the motion stability and contour error control of the CNC system. For the CNC system, in addition to the forward-looking processing and speed planning in the interpolation stage that have an impact on the motion stability and contour accuracy of the CNC system, the multi-axis linkage collaborative control has a greater impact on the motion stability an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/19
Inventor 张礼兵游有鹏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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