Hand-book on Die-castings; Containing Useful Information for Manufacturers and Engineers Concerning Metals, Design, Processes, Methods of Finishing, Fabricating, Etc., with Tables

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ... 01-Pins A sufficient part of such inserts must always be left ex posed (extending from the casting) to permit the die t0 properly hold it in place. When the design does not permit this it is sometimes necessary to cut off the insert after the casting is made. The portion of the insert imbedded in the casting, commencing about Tlg" or more from the surface of the casting, should be knurled, flattened, grooved or squeezed to provide a better grip. Provision must always be made in the casting to firmly anchor the insert, having in mind the strength and characteristics of the particular die-cast metal used. ' i When studs are cast into a wall the opposite side of which is to be polished or finished, a better appearance will be presented if the base of_the stud is pointed to prevent its showing through on the surface, as suggested in the illustration Flat Springs Except in aluminum,springs may be inserted without draw' ing the temper. Springs are usually anchored by punching holes in them. In some cases eyelets are punched into the holes of the springs to give a better hold. Springs.003" to.005" thick should not be over %" wide as otherwise the metal in shrinking will "pucker" them. Tllbing Tubing may be used when the design calls for long thin walls which cannot be cast. It is sometimes used for its strength, or to afford a passage for corrosive liquids. It may be bent in any shape and used as an oil passage, following an irregular line through the casting. It is advisable to extend tubing into which cores cannot be fitted beyond the surface of the casting to prevent the tube from being filled with metal. Such tubes must also usually be braced with pins or cores in the die which are withdrawn when the casting...