Abstract
In this report, it is analayzed theoretically that female precision threading of ceramics can be realized by a new precision ultrasonic super position vibration tapping. And this analytical results can be confirmed by the experiments using a newly developed precision ultrasonic super position vibration tapping machine with the electric stepping motor and 28 kHz ultrasonic torsional vibration mode diamond tap (M 5 pitch 0.8 mm). The main results are as follows : (1) It has been verified that precise female screw threading of WA wheel (φ15×5) can be machined by a new ultrasonic super position vibration tapping machine with diamond tap in one stroke and more efficient. (2) Female thread with precise screw thread shape can be machined more efficient and unusual cutting noise and tap failures scarcely occurred of appliance of earthenware and glass of daily use. (3) By this study, it is believed that this new tapping machine has the possibility of precision machining in female screw threading of various kinds of ceramics.
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