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Intelligent method for automatically regulating servo parameters for numerical control machine tool

A technology of CNC machine tools and parameters, applied in the field of CNC machine tools, which can solve the problems of reducing the feed speed and failing to guarantee the accuracy of parts contours.

Active Publication Date: 2018-12-28
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] However, in the case of high feed speed and complex surface parts processing, since the current CNC machine tools can only passively execute part processing codes, they cannot adjust themselves according to the working conditions and parameter changes in the processing process, and often cannot guarantee the contour accuracy of parts. Requirements; only by reducing the feed rate and sacrificing processing efficiency to meet the part contour accuracy requirements

Method used

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  • Intelligent method for automatically regulating servo parameters for numerical control machine tool
  • Intelligent method for automatically regulating servo parameters for numerical control machine tool
  • Intelligent method for automatically regulating servo parameters for numerical control machine tool

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Embodiment Construction

[0053] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0054] Such as figure 1 As shown, an intelligent method for autonomously adjusting servo parameters applied to CNC machine tools includes the following steps:

[0055] Step 1), run the G code of the complex curved surface part to be processed in the numerical control system, and collect the speed command sequence output to each feed axis after the numerical control system interpolates;

[0056] Step 2), adopting wavelet transform to carry out time-frequency analysis to each feed axis speed command sequence, transform it into several small frequency bands, construct the speed command sequence in the small frequency band;

[0057] Step 3), adopt discrete Fourier transform to carry out frequency spectrum analysis to the speed instruction sequence in each small frequency band, extract the maximum amplitude frequency in each small frequency band;

[0058...

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Abstract

The invention relates to an intelligent method for automatically regulating servo parameters for a numerical control machine tool. The method comprises the steps of collecting a speed instruction sequence of each feed shaft, creating a speed instruction sequence in a small band, extracting a maximum amplitude frequency of each band, and creating a two-dimensional time-frequency array based on timepoint and maximum amplitude frequency of the speed instruction sequence; then creating a servo parameter group of each feed shaft, extracting a servo characteristic parameter, creating a mapping of aservo parameter group and servo bandwidth; then creating a speed instruction attenuation sequence solving equation, a following error sequence solving equation of each feed shaft, a linkage trajectory error sequence solving equation, and a servo characteristic dynamic matching determining equation in sequence; and then searching each sampling position of the speed instruction sequence of each feed shaft, acquiring a servo bandwidth sequence of each feed shaft, converting the servo bandwidth sequence into a servo parameter group time-varying sequence of each feed shaft, and regulating the servo parameter of each feed shaft by the numerical control machine tool automatically according to the servo parameter group time-varying sequence. Through adoption of the method, a complex curve part isguaranteed to have an accurate outline at high feed speed.

Description

technical field [0001] The invention belongs to the technical field of numerical control machine tools, and in particular relates to an intelligent method for autonomously adjusting servo parameters applied to numerical control machine tools. Background technique [0002] A CNC machine tool is an automatic machine tool equipped with a CNC system. The CNC system performs interpolation calculations on the machining G code and outputs speed command sequences to each feed axis; the servo feed system of each feed axis receives these speed command sequences and drives each The feed axis is linked to process the required parts. [0003] The linkage accuracy of CNC machine tools is the accuracy of the linkage trajectory during the linkage process of each feed axis of the CNC machine tool, which together with the tool deformation, vibration and other factors in the cutting process affect the contour accuracy of the machined parts. In order to ensure the contour accuracy of the machi...

Claims

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Application Information

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IPC IPC(8): G05B19/41
CPCG05B19/41G05B2219/34083
Inventor 吕盾李润泽赵万华卢秉恒
Owner XI AN JIAOTONG UNIV
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