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Broaching machine broach structure health monitoring system and method

A health monitoring system and technology for health monitoring, applied in broaching machines, accessories of broaching machines, measuring/indicating equipment, etc., can solve the problems of scrap economy and loss of workpieces and tools, and achieve low equipment cost, simple and reliable structure, Simple and easy method

Pending Publication Date: 2022-03-08
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the potential to cause significant economic losses due to worker misinterpretation and unnecessary scrapping of workpieces and tools

Method used

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  • Broaching machine broach structure health monitoring system and method
  • Broaching machine broach structure health monitoring system and method
  • Broaching machine broach structure health monitoring system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] see figure 1 , a broaching tool structure health monitoring system, comprising a main slide plate 1, a workpiece 2, a broaching tool 3, an acceleration sensor 4, a data acquisition card 5 and a host computer 6, wherein the acceleration sensor 4 is installed on the broaching machine The sliding boards on both sides of the bed are used to measure the acceleration signal in the broaching direction. The acceleration sensor 4 is connected to the data acquisition card 5. The data acquisition card 5 obtains a digital signal and transmits it to the host computer 6. After the host computer 6 intercepts the vibration signal of the sensitive section Quantitative assessment of the structural health of the broach after spectral analysis.

[0032] The structure health monitoring system of the broaching tool of the broaching machine in this embodiment can realize quantitative evaluation and prediction of slight wear or damage of the broaching tool. The invention has the advantages of...

Embodiment 2

[0034] see figure 2 , a method for monitoring the health of a broaching broach structure, which is operated using a system for monitoring the health of a broaching broach structure in Embodiment 1, wherein the monitoring method includes the following steps:

[0035] ① The broach moves at a constant speed, and its teeth will excite the workpiece;

[0036] ②The wear and damage of the tool will cause the excitation of the tool to the workpiece to increase significantly in a certain period of time—a wear-sensitive period;

[0037] ③ Regardless of whether the excitation is periodic or not, a part of the frequency with a relatively large amplitude will be generated on the spectrogram—the characteristic frequency;

[0038] ④Wearing or damage of the broach will lead to a significant increase in the amplitude of all frequencies of the spectrum signal;

[0039] ⑤ Analyze the characteristic frequency amplitude generated by the cutting excitation of the spectrum signal, and quantitativ...

Embodiment 3

[0042] In this embodiment, a broaching tool structure health monitoring method, the acceleration signal collected by the acceleration sensor can only be used after screening; by observing the time domain signal to determine the time domain sensitivity of broach damage to energy changes segment, the sensitive segment is subjected to fast Fourier transform to obtain a spectrogram that can represent the tool wear and damage signal.

[0043] When intercepting the time-domain sensitive segment, it must be ensured that the length and position of the intercepted data are consistent when the sampling frequency of the acceleration sensor is constant; if the length or position is inconsistent, it means that the characteristic frequency amplitudes of the spectrograms are not comparable.

[0044] In this embodiment, the broach broaches the processed workpiece at a constant broaching speed, and the data acquisition card first intercepts the vibration signal of the sensitive section after co...

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Abstract

The invention relates to a health monitoring system and method for a broach structure of a broaching machine, the system comprises a main slide carriage, a workpiece, a broach, an acceleration sensor, a data acquisition card and an upper computer, and quantitative health management of the broach structure of the broaching machine is achieved through broaching tool wear quantitative prediction based on a sensitive section vibration signal frequency spectrum amplitude. When a broach broaches a workpiece at a constant broaching speed, once excitation is generated when broach teeth enter or leave the workpiece. The method comprises the following steps: reading an acceleration signal, firstly intercepting a vibration signal section sensitive to cutter wear from the whole section of acceleration signal, and then carrying out fast Fourier transform on the vibration signal of the sensitive section to obtain a frequency spectrum signal after the acceleration signal is transformed; no matter what kind of excitation is, a frequency signal with a very large amplitude value appears on a spectrogram, the frequency amplitude value change amplitude represents the tool wear degree or damage type, and the larger the frequency amplitude value change amplitude is, the larger the tool wear degree or damage degree is. And the wear degree or different damage types of the broach are quantitatively predicted by utilizing the characteristics.

Description

technical field [0001] The invention provides a system and method for monitoring the structural health of a broaching tool of a broaching machine, which is applied in a complex field environment of a workshop to realize quantitative evaluation and prediction of slight wear or damage of a broaching tool. Background technique [0002] A broach is a form tool used for broaching. There are multiple rows of teeth on the surface of the tool, and the size and shape of each row of teeth increases and changes sequentially from the cutting end to the cutting end. When the broach is broaching, each tooth cuts a certain thickness of metal from the workpiece, and finally obtains the required size and shape. Broaches are often used in batch and mass production to process round holes, spline holes, keyways, flat and formed surfaces, etc., with high productivity. Broaches are divided into internal broaches and external broaches according to the different parts of the processed surface. ...

Claims

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Application Information

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IPC IPC(8): B23D39/00B23Q17/00
CPCB23D39/00B23Q17/008
Inventor 张顺琦唐阳王翔林成辉
Owner SHANGHAI UNIV
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