Effects of copper and silicon on cutting mechanism of copper-silumin

Shigeo MUROMACHI, Shigeo ZAIMA, Yuzo TAKATSUJI, Shizuo TADA, Hisakimi NOTOYA
1972 Keikinzoku/Journal of Japan Institute of Light Metals  
Copper and silicon, principal alloying elements of copper-silumin, seem to have effects on mechanical properties and machinability of the copper-silumin. shearing angle, friction angle, etc. are discussed. The results obtained were as follows: In the alloys containing copper, the chip formation was almost equal to the flowing type with the formation of built-up edge; but in the alloys containing no copper, it was close to a tearing or shearing type and the chip thickness was extremely increased
more » ... extremely increased according to the plastic flow of materials. When copper content was more than 3.0%, the built-up edge and cutting resistance became relatively smaller and no differences were observed in cutting mechanism. In the alloys containing 4.5% of silicon, shearing angles were small, and the 12.0%, no differences were observed in cutting mechanism. The hard acicular or tabular particles of silicon, which had been ruptured by cutting action, were uniformly distributed in the built-up edge. Such a behavior of the particles would contribute to increase the hardness of built-up edges.
doi:10.2464/jilm.22.417 fatcat:w54sh3kex5cxbosb6ajqpv6jwa