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Cutter wear monitoring method for numerically-controlled machine tool

A tool wear, CNC machine tool technology, applied in manufacturing tools, measuring/indicating equipment, metal processing machinery parts, etc., can solve the problem of lack of stable and accurate technical means for tool wear monitoring of machine tools, etc. Effects of processing, increasing frequency range

Inactive Publication Date: 2020-05-19
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of lack of stable and accurate technical means for machine tool wear monitoring, and proposes a method for monitoring tool wear of CNC machine tools based on the combination of vibration and acoustic signals

Method used

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  • Cutter wear monitoring method for numerically-controlled machine tool
  • Cutter wear monitoring method for numerically-controlled machine tool
  • Cutter wear monitoring method for numerically-controlled machine tool

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Embodiment Construction

[0067] The following will combine Figure 1 to Figure 8 This embodiment will be specifically described.

[0068] see figure 1 As shown, the method for monitoring tool wear of CNC machine tools based on the combination of vibration acceleration and acoustic signals described in this embodiment has three stages: cutting data collection, wear feature extraction, and comprehensive evaluation of tool wear.

[0069] The data acquisition step includes the acquisition of vibration data and sound pressure data; the installation position of the sensor is as shown in Figure 2, and the three-axis acceleration sensor is installed on the tool handle of the tool; three microphone sensors are respectively installed on the machine tool adjacent to the cutting point, near the The straight-line distances from the machine tool and away from the machine tool to the cutting point are 0.3m, 0.6m and 1.2m respectively. The cutting signals of three groups of tools with different wear degrees were co...

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Abstract

The invention discloses a cutter wear monitoring method for a numerically-controlled machine tool. The cutter wear monitoring method for the numerically-controlled machine tool comprises the followingsteps: acquiring a vibration acceleration signal and a microphone sound signal during working of a cutter of the machine tool as signals to be analyzed at first; pretreating an original signal by virtue of a rapid independent component analysis algorithm to obtain a vibration signal and a sound signal which are subjected to preliminary noise reduction, and then decomposing the acceleration signaland the sound signal by virtue of a variational mode decomposition algorithm to obtain respective intrinsic empirical mode functions separately; then carrying out denoising on existing modes by the rapid independent component analysis algorithm introducing a virtual noise channel to obtain effective mode components; adopting the maximum power spectrum density as a wear feature for extracting an intrinsic mode having the highest correlation degree with wear information; and finally composing a two-dimensional feature space by the wear features of the acceleration signal and the sound signal, and carrying out wear evaluation in a combined manner. The cutter wear monitoring method for the numerically-controlled machine tool is capable of effectively extracting the complete wear information,and realizing higher-stability and higher-resolution-ratio monitoring for the wear degree of the cutter.

Description

technical field [0001] The invention relates to a method for monitoring the wear state of a CNC machine tool tool. Background technique [0002] As the foundation of the machinery manufacturing industry, the digitization, automation and intelligence of CNC cutting technology is of great significance to the entire machinery manufacturing industry. As the execution unit of CNC machining technology, the cutting tool is healthy and stable, which will directly affect the quality and efficiency of cutting processing. On the one hand, with the further development of advanced manufacturing technology, higher requirements are put forward for the precision of products; on the other hand, the competition in the international manufacturing industry is becoming increasingly fierce, and it is imminent to upgrade and update technology. According to relevant statistics, the shutdown rate caused by cutting tools in the process of CNC machine tool processing accounts for about 22.4% of the t...

Claims

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Application Information

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IPC IPC(8): B23Q17/09
CPCB23Q17/09
Inventor 刘祖斌陈建鹏
Owner ZHEJIANG UNIV OF TECH
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