Introduction
Low pressure casting is the liquid metal filling into the cavity by pressure,then become a casting.Due to the pressure is low, it is called a low pressure casting.
Here is the production process of low pressure casting: dry compressed air is piped in the seal of the crucible (or sealed cans),under the action of gas pressure, the liquid metal along the lift tube & through gate smoothly into the cavity and remain the gas pressure on the surface of the liquid in the crucible, until the casting solidification completely.Then remove the gas pressure,make un-solidified metal liquid flow in the tube crucible, then open the mould,and carry-out casting by cylinder.
Low-pressure casting has been wide used for mass production of, for instance, cylinder heads of automotive engines. In the low-pressure casting, molten light metal such as aluminum alloy held in a tightly enclosed vessel is cast in a cavity in a mold under a relatively low pressure of inert gas or air applied to the surface of the molten metal.
Generally the mold employed in such low-pressure casting is of metal and comprises a lower mold, an upper mold which is moved up and down toward and away from the lower mold and a pair of slide molds which are disposed between the upper and lower molds to be movable left and right and are slidably engaged with the upper and lower molds. When these molds are closed, a cavity having a shape conforming to the shape of a product to be cast is formed.
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