Turning machinability of aluminum-silicon alloy castings
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概要
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In this paper, there is discussed the turning machinability of aluminum-silicon alloy castings. The alloys examined were the materials for members of automobile engines. They were composed of the chemical compositions in Table 1 and were designated as A, B, and C according to silicon contents of 22, 24, and 13%, respectively.The types of cutting tools used in the experiments were 31-2 and 33-2 of sintered hard alloy K-10. The conditions of machining were as follows: orthogonal cutting for materials A and B, and oblique cutting for material C; and the details of other conditions will be given in this paper.The results obtained were as follows:(1) Cutting resistanceThe cutting resistance was very lower than that in iron and steel, and it depended upon silicon content and the formation of built-up edge.(2) Roughness of finished surfaceThe surface was smoother in the materials A and B under low cutting resistance. The quality of surface depended upon plowing up of primary silicon crystals and chattering of the tool. Whereas, the surface roughness of the material C was approximate to the theoretical value.(3) Chip treatmentIn the materials A and B, chips were curled into a small radius and ruptured into small fractions, which were seattered around the tool holder. Whereas, the maximum length of the chips in the material C was about 200mm, which were easily treated in the experiments.(4) Built-up edgeFormation of built-up edge was observed in the range of low cutting speed in the materials A and B. Whereas, it was observed even at the cutting speed of 240m/sec. in the material C. The critical cutting speed for its formation largely depended upon silicon content.The built-up edge densely covered the edge from the backrake surface to the flank and severely lowered the quality of finished surface.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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