| Summary: | 碩士 === 國立高雄第一科技大學 === 機械與自動化工程系碩士班 === 105 === In the piercing process, when the wear of punch becomes serious, will affect the quality of the product. In addition, the broken punch will affect the product percent of the pass. As a result, the immediate monitoring of the punch failure in the piercing process becomes more important. However, the existing monitoring of punching process is rather scarce in the world.
The purpose of this study is to investigate the immediate monitoring of punch damage in the cutting process. In this paper, the load, noise, and vibration signals are measured in the micro precision punching life cycle by the load meter, the microphone and accelerating gage tha set up in the precision punching machine. And associated with the punch wear and the bur of the board during the corresponding period. The piercing process is based on the sensor to on-line monitor the damage of the punch in time.
This study is based on micro-punching processing used the punch diameter of 0.8mm, the plate material for the stainless steel(SUS304), sheet thickness is 0.5mm, punching machine speed of 50rpm. The experimental results show, before punch broken , the peak vibration signal between the frequency of 280Hz ~ 500Hz obviously increased when the punch nearly broken, the lower mode vibration signal is obviously larger in the frequency between 400Hz ~ 750Hz, the noise signal is at the frequency of 300Hz ~ 450Hz between the peak also increased. In the cutting process, with the number of punching increased, the wear of cutting edge of punch is gradually increased, bur of the sheet is increased, punching force will increase. In addition, the reproducibility test results show that when the punch broke, the punching times of the two punches are less than 10%.
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