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A Multi-axis Machining Contour Error Pre-compensation Method Based on Interpolation Data

A contour error, multi-axis machining technology, applied in program control, instrument, computer control, etc., can solve the problems of compensation accuracy fluctuation and complex compensation process, and achieve the effect of improving compensation accuracy, ensuring continuity and simple operation

Active Publication Date: 2022-04-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These characteristics will make the compensation process of contour error extremely complicated, and the compensation accuracy will fluctuate with different estimation methods

Method used

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  • A Multi-axis Machining Contour Error Pre-compensation Method Based on Interpolation Data
  • A Multi-axis Machining Contour Error Pre-compensation Method Based on Interpolation Data
  • A Multi-axis Machining Contour Error Pre-compensation Method Based on Interpolation Data

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A pre-compensation method for contour errors in multi-axis machining based on interpolation data, such as figure 1 and figure 2 shown, including the following steps:

[0047] (S1) using the workpiece G code as the input of the numerical control system;

[0048] (S2) Make the CNC system run without load in the non-processing state. During the interpolation process, according to the mutual positions of the command interpolation points, the angle of the rotation axis at each command interpolation point is synchronously determined. After the operation is completed, the CNC system feedback is obtained The actual interpolation data, to calculate the contour error vector at each actual interpolation point, if the contour error meets the preset accuracy requirements, then go to step (S6); if not, then go to step (S3);

[0049] The actual interpolation data can be fed back by the grating ruler of the machine tool; the theoretical processing curve can be determined according t...

Embodiment 2

[0082] A computer-readable storage medium, including a stored computer program; when the computer program is executed by a processor, the device where the computer-readable storage medium is located is controlled to execute the method for pre-compensating the contour error of multi-axis machining based on interpolation data provided in Embodiment 1 above .

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Abstract

The invention discloses a multi-axis machining contour error pre-compensation method based on interpolation data, belonging to the field of machining optimization of numerical control machine tools, comprising: after inputting the G code of the workpiece into the numerical control system, performing the following iterative process: making the numerical control system run without load, For multi-axis machining, the rotation axis angle at each command interpolation point is determined synchronously during the interpolation process. After the operation is completed, the contour error vector at each actual interpolation point is calculated. If the accuracy requirements are met, the pre-compensation ends. Otherwise, correct the command interpolation points based on the contour error vector; for each G code segment, perform spline fitting on all the corrected command interpolation points, and obtain the corresponding spline curve. During the fitting process, maintain The angle of the rotation axis corresponding to the end point of the G code segment remains unchanged; the angle of the rotation axis corresponding to each spline curve and the tool position point is used as the new input of the CNC system to start the next round of iteration. The invention can simplify the contour error compensation process and improve the compensation accuracy.

Description

technical field [0001] The invention belongs to the field of machining optimization of numerical control machine tools, and more specifically relates to a multi-axis machining contour error pre-compensation method based on interpolation data. Background technique [0002] In the process of CNC machining, due to errors in each process, such as tool overcut or interference, etc., resulting in contour errors in the final processed workpiece, the geometric accuracy is reduced. [0003] At present, a variety of error compensation techniques have been applied in the field of machine tool processing. The traditional method is to use a three-coordinate measuring instrument to measure the dimensional accuracy of the workpiece after the workpiece is processed to obtain error data, and use the error data to adjust the processing program. This method is complicated to operate, has a low degree of automation, and is greatly affected by external factors such as the level of personnel ope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/404
CPCG05B19/404
Inventor 杨建中朱万强周会成张建雄高嵩张成磊
Owner HUAZHONG UNIV OF SCI & TECH