. Transactions. Fig. 8.—Cross-section op casting with two gating positions. an alloy showing little or no elongation at normal temperatures shows ahigh elongation at higher temperatures. The alloys of aluminum andcopper may serve to illustrate this point. It is well known that the addi-tion of copper to aluminum reduces the elongation of the aluminum aluminum alloy containing 12 per cent, copper will show less elon-gation than an alloy containing only 6 per cent, copper when tested atnormal temperatures. Nevertheless, the 12 per cent, copper alloy has. Fig. 9.—Die casting containing s
. Transactions. Fig. 8.—Cross-section op casting with two gating positions. an alloy showing little or no elongation at normal temperatures shows ahigh elongation at higher temperatures. The alloys of aluminum andcopper may serve to illustrate this point. It is well known that the addi-tion of copper to aluminum reduces the elongation of the aluminum aluminum alloy containing 12 per cent, copper will show less elon-gation than an alloy containing only 6 per cent, copper when tested atnormal temperatures. Nevertheless, the 12 per cent, copper alloy has. Fig. 9.—Die casting containing shrinkage hole. a greater elongation at higher temperatures than the 6 per cent, alloyand consequently the 12 per cent, alloy is better able to withstand thecasting stresses to which it is subjected in the die-casting process. In the early days of the die-casting industry, alloys were compoundedindiscriminately and little or no consideration was given to the metal-lurgical principles involved. The manufacturer in many instances 586 DIE CASTINGS AND THEIR APPLICATION TO THE WAR PROGRAM knew much more about machinery than about metals. The result wasthat there were put on the market die castings made from alloys thatdeteriorated rapidly and created a prejudice among engineers againstthe use of these castings. That this prejudice was in part justified mustbe admitted; nevertheless, the modern die-casting plant is equippedwith physical and chemical testing laboratories and the die-casting prac-tice of today bears no relation to that of 5 years ago. Die Cas
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
