鉛入り黄銅の被削性に及ぼす鋳造法の影響について

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A series of experiments were performed with leaded brass rods of nearly equal chemical composition with a view to finding out the effect of different sorts of casting process on their machinability in terms of cutting resistance, surface roughness and chip formation. Four billets were chosen for the specimens variously processed, namely by the continuously casting method, by the metal moulding method, by the shell moulding method, and by the bran moulding method respectively. These specimens were subjected to cutting on the lathe, drilling and reaming. The specimens were, so far as their hardness was concerned, all of no perceptible variance, but in the size of their crystallized grains were in the ascending grade from the specimen with the finest grains processed by the continuously casting method, through that processed by the metal moulding method, and further through that processed by the shell moulding method, in the end to that processed by the bran moulding method. The grains in the last mentioned two sorts were found to be of considerable size. So also in the ascending grade the specimens appeared to be in the size of the ingredient lead particles scattered in the whole structure of the specimens from the specimens with the finest ingredient lead particles processed by the continuously casting method, through that processed by the metal moulding method, and further through that processed by the shell moulding method, in the end to that processed by the bran moulding method. The result of the experiment by subjecting the specimens to cutting on the lathe show that there is remarkable effect of the different sorts of casting process on their machinability. Here cutting resistance shows the specimens in the ascending grade from the minimum of resistance to the specimen processed by the continuously casting method, through the resistance to that processed by the metal moulding method, and further through the resistance to that processed by the shell moulding method, in the end to the resistance to that processed by the bran moulding method. Chip formation also shows the specimens of different sorts of casting process in the ascending grede corresponding to the above, while surface roughness shows no variation in the specimens of whatever casting pattern. The experiment by subjecting the specimens to reaming shows the same result as above. The experiment by subjecting the specimens to drilling shows a little variation. Here the cutting resistance to the specimens variously processed in casting shows the specimens in the ascending grade from the minimum of the cutting resistance to the specimen processed by the shell moulding method to the resistance to that processed by the continuously casting method and that processed by the bran moulding method. The surface finishing shows smooth-rough grade in the specimens variously processed in casting in favour of the specimen processed by the bran moulding method before that processed by the continuously casting method and that processed by the shell moulding method.
社団法人日本材料学会の論文
1965-10-15

鉛入り黄銅の被削性に及ぼす鋳造法の影響について

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