Extrusion is the plastic deformation process by which a metal is forced to flow by compression through the die orifice of a smaller cross-sectional area than that of the original billet. Since the material is subjected to compressive forces only, the extrusion is an excellent method for breaking down the cast structure of the billet with little or no cracking. Although room temperature (cold) extrusion is also exercised, most metals are extruded hot when the billet is preheated to facilitate plastic deformation. So far, commercial extrusion applications do not utilize preheating materials above the solidus temperature to enter the semisolid range.
KeywordsSolid Content Injection Molding Mold Cavity Injection Velocity Mold Filling
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