過共晶Al-Si合金旋削時の工具摩耗に関する2,3の検討
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概要
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Aluminium-silicon alloy of 10~13% Si content is successfully employed in automotive engine. The alloy of higher content of silicon called hypereutectic Al-Si alloy is, however, not of sufficient industrial use because of its poor machinability which is characterized by extreme growth of flank wear on cutting tool and succeeding rough surface finish. In this paper the mechanism of the flank wear growth on cutting tool in turning hypereutectic alminium-silicon alloy is investigated in order to establish the method to machine the alloy efficiently. The relationship between flank wear and cutting temperature is investigated under various cutting conditions with several cutting speeds, feeds and tool shapes. It is observed that the wear width is not affected by cutting temperature but increases propotionally to cutting length under conditions of cutting temperature around 400C or below, and under the conditions of higher cutting temperature the wear rate increases slightly with the temperature. Some cutting tests are also performed applying active and inert gas upon cutting point under the conditions of rather higher cutting temperature, thereby it is observed that the flank wear is not affected by the ambient gas. The experimental results lead to a conclusion: the extreme flank wear growth on cutting tool in turning hypereutectic alminium-silicon alloy is predominantly governed by mechanical abrasion of hard proeutectic silicon particles distributed in the alloy.
- 長岡技術科学大学の論文
- 1984-01-31