. Transactions. 1 Fig. 3.—Doehler compressed-air machine. will fill the entire mold cavity, assuming all casting conditions to be ideal,but the metal in the thin section adjoining A will chill before the heaviersection so that, the chilling being from the outside, a shrinkage hole willbe left in the center. Here again no advantage can be gained by theuse of the vacuum system. CHARLES PACK 581 Dies In the manufacture of die castings from zinc, tin, and lead alloys,dies made from low-carbon machine steel last almost indefinitely andanswer every purpose. In the first attempts to die-cast aluminum
. Transactions. 1 Fig. 3.—Doehler compressed-air machine. will fill the entire mold cavity, assuming all casting conditions to be ideal,but the metal in the thin section adjoining A will chill before the heaviersection so that, the chilling being from the outside, a shrinkage hole willbe left in the center. Here again no advantage can be gained by theuse of the vacuum system. CHARLES PACK 581 Dies In the manufacture of die castings from zinc, tin, and lead alloys,dies made from low-carbon machine steel last almost indefinitely andanswer every purpose. In the first attempts to die-cast aluminum,the problem of obtaining a suitable die material presented serious diffi-culties, which were described by the writer in a paper read before the. Fig. 4.—Another type of compressed-air machine. American Institute of ISIetals in 1915. This problem, however, has beensolved by the use of various alloy steels making possible the com-mercial die casting of aluminum and its alloys, which constitutes thegreater part of the die-casting industry of today. The proper gatingand venting of these dies are preblems that arise daily and on thesolution of these problems depends the success or failure of the process. 582 DIE CASTINGS AND THEIR APPLICATION TO THE WAR PROGRAM AlloysIn a paper read before the American Institute of Metals in 1914, thewriter described the various types of zinc, tin, and lead alloys used in thedie-casting process. The application of these alloys and their limita-tions were also pointed out. At that time the die casting of aluminumand its alloys was barely beyond the experimental stage. During the
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
