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Low-pressure casting
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Product Description
It refers to the casting method that the mold is generally placed above the sealed crucible, and the crucible is filled with compressed air, which causes low pressure (0.06-0.15MPa) on the surface of molten metal, so that the liquid metal rises from the riser to fill the mold and control the solidification. With good shrinkage and compact casting structure, this casting method is easy to cast large and complex thin-walled castings without riser, and the metal yield is up to 95%. No pollution is generated, and it is easy to realize automation. However, the equipment cost is high and the production efficiency is low. It is generally used for casting non-ferrous alloys.
● Principles
Low-pressure casting is a casting method that the liquid alloy is pressed into the mold cavity from bottom to top under pressure and solidified under pressure to obtain castings. The principle of low-pressure casting is shown in Figure 1 Principle of Low Pressure Casting. The sealed crucible is filled with dry compressed air or inert gas. With the help of the pressure acting on the metal surface, the molten metal is filled with the mold smoothly from bottom to top along the riser through the runner. The filling pressure is generally 20-60kPa. When the casting is completely solidified, the gas pressure on the liquid surface is released, so that the metal liquid without solidification in the riser pipe and runner flows into the crucible by its own weight, and then the cast is opened and the casting is removed.
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