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The difference between casting and die casting
Release date:2014-10-30 Clicks:130 Article author:
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According to the casting pouring process of molten metal into gravity casting and pressure casting. Gravity casting refers to the liquid metal injection mold process in the earth's gravity, also known as casting. The generalized gravity casting include sand casting, metal mold casting, investment casting, die casting, mud casting; metal type casting refers to narrow gravity casting. Pressure casting is refers to the liquid metal in the other forces (including gravity) under the action of injection mold process. Generalized pressure casting die casting machine including pressure casting and vacuum casting, low pressure casting, centrifugal casting; metal pressure casting narrow die casting machine casting, referred to as die casting. Precision casting factory engaged in sand mold and metal mold gravity casting. The casting process is the most commonly used in non-ferrous metal casting, but also the relative price lowest.

Die casting is a metal pressure on the die casting machine casting, is currently the highest production efficiency of the casting process. Die casting machine is divided into hot chamber die casting machine and cold chamber die casting machine two.Hot chamber die-casting machine a high degree of automation, less material consumption, the production efficiency is higher than the cold chamber die casting machine, but restricted by mechanical heat capacity, at present can only be used in casting production of zinc alloy, magnesium alloy and other low melting point materials. Aluminum Alloy nowadays widely used in die casting, due to the high melting point, can only be produced in a cold chamber die casting machine.

The main characteristics of die casting is the molten metal in the cavity filling under high pressure and high speed, and under high pressure forming, solidification, deficiency of die casting is: because the liquid metal in the process of high pressure, high speed filling cavity, inevitably the cavity in the air wrapped in the castings, the formation of blowhole so Aluminum Alloy die casting for heat treatment, zinc alloy die casting surface spray (but not painting). Otherwise, casting internal hole in the above treatment when heated, the heat expansion and the casting deformation or bubble. In addition, die casting mechanical machining allowance should be made smaller, generally about 0.5mm, can reduce casting weight, reduce cutting amount to reduce the cost, but also can avoid the penetration of surface dense layer, exposing the blowhole, cause the scrap.