Abstract
Abstract Studies on the application of hot-pressed Si 3 N 4 as cutting tool were carried out and satisfactory results achieved. In cutting hardened tool steels, chilled cast iron, pure molybdenum and pyrolytic graphite, the tool life of Si 3 N 4 cutting tools is several times as long as that of sintered carbide tools. In threading, the Si 3 N 4 cutting tool also performs satisfactorily. In order to test its cutting property under shock load, a milling test was made. The results show that the Si 3 N 4 cutting tool can resist the shock load in milling. In cutting cast iron with high cutting speed, the Si 3 N 4 cutting tool was also successful. These results indicate that hot-pressed Si 3 N 4 is a cutting tool material which should be developed extensively.
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