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A fast adjustment method for multi-axis machine tool servo parameters for consistent closed-loop frequency response

A multi-axis machine tool, fast adjustment technology, applied in the direction of digital control, control/regulation system, program control, etc., can solve the problems of time-consuming and labor-intensive, closed-loop frequency response difference, etc., to reduce the linkage track error, ensure linkage accuracy, save The effect of debugging time

Active Publication Date: 2021-06-11
XI AN JIAOTONG UNIV +1
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AI Technical Summary

Problems solved by technology

However, due to the inconsistent mechanical frequency response of each axis, after adjusting the servo parameters with the goal of optimizing single-axis servo performance, there may be significant differences in the closed-loop frequency response of each axis.
In order to make the closed-loop frequency response of each axis consistent, the circular trajectory test and other methods are often used to adjust the servo parameters of each axis. Through trial and error, the closed-loop frequency response of each axis of the machine tool is consistent. The debugging process depends on the experience of the debugging personnel. and very time consuming

Method used

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  • A fast adjustment method for multi-axis machine tool servo parameters for consistent closed-loop frequency response
  • A fast adjustment method for multi-axis machine tool servo parameters for consistent closed-loop frequency response
  • A fast adjustment method for multi-axis machine tool servo parameters for consistent closed-loop frequency response

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Embodiment Construction

[0038] The method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] refer to figure 1 , a method for quickly adjusting servo parameters of a multi-axis machine tool with consistent closed-loop frequency response, including the following steps:

[0040] Step 1: Read the servo parameters of the position loop and speed loop of each feed axis of the machine tool;

[0041] After each axis has completed the servo parameter debugging with the best servo performance, read the servo parameter value of each axis by consulting the internal parameters of the controller; write its closed-loop transfer function G according to the control structure c_i (s);

[0042] If the feed axis adopts P-PI control, that is, the position controller is a P controller, and the speed controller is a PI controller; the servo parameters of each axis that need to be read are: position loop gain kp_i , speed loop gain k v_i , speed loop integr...

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Abstract

A method for quickly adjusting the servo parameters of multi-axis machine tools with consistent closed-loop frequency response. First read the servo parameters of the position loop and speed loop of each feed axis of the machine tool, then identify the mechanical parameters of each axis of the machine tool, and then find out the axis with the weakest servo performance. According to the servo parameters, mechanical parameters and other axis mechanical parameters of the axis with the weakest servo performance, calculate the servo parameters of the position loop gain, speed loop gain and speed loop integral time constant of other axes, and finally input the calculated servo parameters of each axis into the corresponding axis, so that the closed-loop frequency response of each axis is consistent; the invention is used to quickly adjust the servo parameters of each axis, so that the closed-loop frequency response of each axis of the machine tool tends to be consistent, thereby ensuring the multi-axis linkage accuracy of the machine tool, and realizing the quantitative solution of servo parameters. It avoids the process of repeated trial and error in the traditional servo parameter adjustment, saves debugging time, and improves debugging efficiency and accuracy.

Description

technical field [0001] The invention belongs to the technical field of CNC machine tool feed system control, and in particular relates to a method for quickly adjusting servo parameters of a multi-axis machine tool for consistent closed-loop frequency response. Background technique [0002] CNC machine tools are widely used in the processing and manufacturing of complex-shaped parts such as stamping dies, ship propellers, aircraft structural parts, and steam turbine blades. They are the core equipment of the manufacturing industry. Improving the precision of CNC machine tools is the unremitting goal of machine tool designers and manufacturers. [0003] For multi-axis machining, the accuracy of linkage trajectory is the key factor to determine the machining accuracy of parts. However, the inconsistency of the closed-loop frequency response between the servo axes makes it difficult to guarantee the desired trajectory accuracy. For example, when the two axes are linked to a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/19
CPCG05B19/19G05B2219/45136
Inventor 赵万华刘大炜湛承鹏秦枭品吕盾
Owner XI AN JIAOTONG UNIV
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