日本金属学会誌

J. Japan Inst. Metals, Vol. 28, No. 12 (1964),
pp. 800-804

On the Electric Discharge Drilling of Berylium Bronze

Shigeo Zaima1 and Susumu Kamo1

1Department of Machinery, Faculty of Engineering, Shizuoka University, Hamamatsu

Abstract:

With the development of various studies, belyrium-copper has in it the possibilities of a great future as it has good strength compared with a steel, but its machining data are rarely available and the actual conditions for machinability remain unclear. The author investigated the electric discharge machinability of belyrium-copper in the case of the electric discharge drilling and cutting, in order to find the best discharging condition for the drilling of belyrium-copper. In this paper the machinability on the electric discharge drilling is reported as follows:
(1) Belyrium-copper has extremly higher hardness than titanium or mild steel, but its machinability on electric discharge drilling is almost as good as that of brass.
(2) The difference in microscopic structure by workhardening or heat treatment seems no influence the electric discharge machinability.
(3) The drilling time varies by the operating condition, but there exists the most suitable operating current and a good result is obtained with machine oil.
(4) If the drilling time is decreased by increasing the condenser capacity or the source voltage, the machining accuracy seems to deteriorate slightly.


(Received 1964/6/22)

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