complete book of sand casting by C. Ammen

By C. Ammen

Describes the sand foundry, the features of molding sand, the kinds of mould and development making gear, and some of the sand casting tactics for forming metals.

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Strip of metal on the parting face of the cope which prevents the cope from dropping out (while molding) which it would do without the strip, due to the taper on the cope's inner surface. After the mold is made and closed this strip is retracted by a cam lever. When the strip is retracted the tapered flask is easily removed by simply lifting it from the mold. See Fig. 4-13. The other is called a pop off flask. In this type of flask, both comers cope and drag diagonally across from one another are clamped by a cam locking device.

Disperse properly and evenly throughout the sand mix. Should produce a mixture that can be easily formed. CORE MIXES The following is a list of core mixes that I have used for a number of years with good success. % parts Wheat flour. Air float sea coal parts Rosin. 1part For small castings New molding sand ........................................... 15 parts Sharp sand.. 5 parts 1part Linseed oil ............................................... ........................................ ...................................................

See Fig. 6-10. The core box may have one loose piece or many. Sometimes a loose piece may have a loose piece of its own. Swept Core A core can be produced by a suitable shaped sweep (or stickel) and guide rails. The guide rails are clamped to a core plate. Core sand is heaped in between the rails and swept to shape by the sweep fom. When finished the guide frame is removed and the core dried. The swept core might have several different diameters and may be curved etc. The shape dictating the frame construction and the number and shape of the strikes.

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