Studies on ultrasonic vibration-assisted coining of micro-cylinder
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The process of micro-coining has been widely applied in micro-forming as it is easy to realize the positioning and assembling of micro-parts. In this study, ultrasonic vibration-assisted micro-forming system was established whereby conventional coining (C-coining) and ultrasonic vibration-assisted coining (US-coining) of micro-cylinder of pure copper were carried out. In case of C-coining, the height-to-diameter ratio of the formed micro-cylinder essentially remained unchanged when the grain size and forming load were kept constant. There is an optimum height of the specimen was noted to obtain the highest micro-cylinder by keeping other conditions remain the same. On the other hand, in case of US-coining, the height of micro-cylinder increased after applying ultrasonic vibration under different grain sizes and diameters of micro-cylinder. The rate of growth in the height of micro-cylinder is directly proportional to the ultrasonic amplitude under different grain sizes. The application of ultrasonic vibration in US-coining has a great impact in the micro-coining of micro-cylinder when the ratio of the height of specimen to the diameter of micro-hole was less than 2, and the largest rate of growth is more than three times as compared to the process of C-coining.
KeywordsMicro-forming Ultrasonic vibration Acoustic softening Coining process
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The research work was supported by the National Natural Science Foundation of China (51675307, 51375269).
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