Casting terms & pattern
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The document discusses key terms related to casting processes: - A flask is a metal or wood frame used to form molds, and can be a drag (lower) or cope (upper) depending on its position. - A pattern is a replica of the final object that is used to form the mold cavity. - A parting line divides the two molding flasks that make up the mold. - Molding sand is a mixture of silica sand, clay, and moisture used to form molds.
Casting terms & pattern
- 2. Vikrant Sharma, Assistant Prof. MITS Lakshmangarh
- 3. Flask : A metal or wood frame, without fixed top or bottom, in which the mold is formed. Depending upon the position of the flask in the molding structure, it is referred to by various names such as drag lower molding flask, cope upper molding flask. Pattern: It is the replica of the final object to be made. The mold cavity is made with the help of pattern. Parting line: This is the dividing line between the two molding flasks that makes up the mold. Molding sand: It is a mixture of silica sand, clay, and moisture in appropriate proportions. Core: A separate part of the mold, made of sand, which is used to create openings and various shaped cavities in the castings Vikrant Sharma, Assistant Prof. MITS Lakshmangarh
- 4. Pouring basin: A small funnel shaped cavity at the top of the mold into which the molten metal is poured. Sprue: The passage through which the molten metal, from the pouring basin, reaches the mold cavity. In many cases it controls the flow of metal into the mold. Runner: The channel through which the molten metal is carried from the sprue to the gate. Gate: A channel through which the molten metal enters the mold cavity. Riser : A column of molten metal placed in the mold to feed the castings as it shrinks and solidifies Vent: Small opening in the mold to facilitate escape of air and gases. Vikrant Sharma, Assistant Prof. MITS Lakshmangarh
- 5. Pattern is principal tool during the casting processes. Pattern is the replica/model of the object to be made by the casting process, with some modifications. - Addition of pattern allowances - Provision of core prints Vikrant Sharma, Assistant Prof. MITS Lakshmangarh
- 6. Easily worked, shaped and joined Light in weight Strong and hard Resistance to wear Resistance to corrosion and to chemical reaction Dimensionally stable and unaffected by variation in temperature. Available at low cost Vikrant Sharma, Assistant Prof. MITS Lakshmangarh