In sand casting process good dimensional accuracy can be obtained compared to die casting process. Select one: True False
In sand casting process good dimensional accuracy can be obtained compared to die casting process.
Casting is a very old process that which can be carried out in a number of ways. In this process, molten metal is poured into a mold and, upon cooling, the metal solidifies and conforms to the mold’s shape
In Die Casting process, metal molds, commonly known as dies are filled with liquid metal under pressure to create parts with high accuracy. The dies are usually developed by machining two mold halves out of a tool steel into the desired exterior contour of a part, and they last between 15,000-500,000 castings per die.
The metal (mostly aluminum or steel) is fed under high pressure in the clamped die halves, where the metal will conform to the die’s shape.
The quality of parts developed from die casting are well known for their dimensional accuracy and surface finish. Die casting is majorly used for developing medium-sized parts with complex details such as automobiles, gears, appliance parts, toys, and much more.
In Sand casting, sand is used to create the casting molds for parts. A pattern is first developed with material such as wood, plastics, etc which is in the shape of the final shape of the product. This pattern will then be placed into one of two halves of a mold, known as either a cope (top half) or drag (bottom half), and sand will be packed tightly around the pattern. After this step, gating systems, runners, etc are added to finalize the mold, and each half is clamped together. After the mold is finalized, molten metal can be poured into the clamped mold and set to cool. When fully solid, the sand can be removed via water jets, vibration, or other methods until the final part is unearthed.
In Sand casting, It is necessary to carry out post-processing in sand casting such as removal of excess material, polishing, etc as this procedure does not conform to the mold as accurately as other casting methods.
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