The Contact Area Measurement of Dovetail Milling Cutter by Using Ultrasonic Method

• Main Authors: Yen-Xun Chien, 簡延勛
• Other Authors: Chuang-Wen Yao
• Format: Others
• Language: zh-TW
• Published: 102
• Online Access: http://ndltd.ncl.edu.tw/handle/20578627428025773766

碩士 === 國立高雄應用科技大學 === 模具工程系 === 101 === This study was to investigate the area of contact between a dovetail milling cutter and a metal plate. The method is to use ultrasonic detection to scan the contact interface. When the ultrasonic pulses hit the contact surface, if there is no contact between the interfaces, the pulse will be completely reflected back to the sensors. If there is part of contact, the pulse will be transmitted through the interface. Therefore, the signal reflected to the sensor will be weakened. From the readings of reflected signals, it can be deduced the degree of contact. The area of contact between the dovetail milling cutter and the metal plate was processed by the image analysis software. According to the different contact load and contact ratio, the contact area varies from 4mm2 to 50mm2. From the experiment results, the common used contact areas range from 10 mm2 to 40mm2. This research also studied the relationship between the changes of resistance and the contact area. The experimental results show that the contact area becomes greater and the relative contact resistance becomes smaller when the load is increasing. Therefore it proves that the contact area is inversely proportional to the contact resistance.