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Essay On Sand Molds

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Molding Methods

Molding process is used to create intricate metal components. The mold material used to make these “molds” could be either temporary or permanent. Temporary molds are made up of refractory sands and resins. The temporary mold has to be broken to retrieve the cast. Permanent molds are made of ferrous materials and are normally employed for casting low melting point materials but this process is too costly. Because of this conundrum, most of the foundry industry has its castings produced using temporary mold materials. Compared to permanent molds, the temporary sand molds can cast high melting point materials and larger parts, while permanent molds can produce small castings of better quality and dimensional accuracy.

Sand casting uses temporary sand molds to form complex metal components that can be made of almost any alloy. Sand casting has a relatively lower production rate as each time the part solidifies, the mold has to be broken to retrieve the part. The sand casting process makes use of a furnace, metal, pattern, and sand mold. The metal is melted in the furnace, ladled, and then poured into the cavity of the …show more content…
The mold has its drag part in the pit and a separate cope is rammed and used above the (pit) drag. The depth of the drag in pit molding is much more than that in floor molding. In pit molding, the molder may enter the drag and prepare it. A pit is of square or rectangular shape. The sides of the (pit) drag are lined with brick and the bottom is covered with molding sand . The cope (a separate flask) is rammed over the pit (drag) with pattern in position. Gates, runner, pouring basin, sprue etc. are made in the cope. The mold is dried by means of a stove(heater) placed in the pit. Cope and drag are then assembled. A crane may be used for lifting and positioning the cope over drag. Cope can be clamped in position. Mold is ready for being

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