Die-casting; a treatise on the development of die-casting machines, the commercial application of the process, and the alloys used for die-casting

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...automobiles for main-shaft and connecting-rod bearings. In addition to the five compositions mentioned, hundreds of similar alloys may be made, having various specific properties. The die-casting process is applicable to any of the alloys of this group, and it may be left with the engineer to specify the alloy best suited to his requirements. The maximum fusing point of tin alloys is about 450 degrees F.; the maximum weight for castings made from these alloys, about 10 pounds; the limit in wall thickness, 1/32 inch; the variations from the given dimensions per inch of diameter or length, 0.0005 inch; and the finest pitch of thread that can be cast externally, 27 threads per inch, while the number of internal threads depends upon various conditions. The minimum diameter of hole that can be cast is 1/32 inch, but this diameter depends on the depth of the hole and the type of the casting. The required draft for cores is 0.0005 inch per inch of length or diameter, and for side walls, 0.001 inch per inch of length. Tin alloys find their largest field of application in their use as bearings for internal-combustion engines. They are also used for parts of soda fountains, cream separators, milking machines, surgical apparatus, galvanometer parts, player pianos, etc., where a tensile strength of over 8000 pounds per square inch is not essential and where resistance to corrosion is of importance. They are not affected by water, weak acid or alkaline solutions, and when free from lead, are extensively used for food-container parts. Aluminum Alloys. Pure aluminum can now be die-cast on a commercial scale, but this is very seldom done, because there is no particular commercial application for such castings. They are too soft for commercial use, and the standard aluminum...