Ningbo Yinzhou Xuxing Machinery Co.,Ltd. tells you the process principle of low pressure casting process.
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Low pressure casting is a method of filling a cavity with liquid metal under pressure to form a casting. Because of the lower pressure used, it is called low pressure casting. The process is as follows: dry compressed air is introduced into the sealed crucible (or sealed tank), and the molten metal 2 rises along the liquid riser 4 under the action of gas pressure, and smoothly enters the cavity 8 through the gate 5 , and maintain the gas pressure on the liquid level in the crucible until the casting is completely solidified. Then, the gas pressure on the liquid surface is relieved, so that the unsolidified metal liquid in the liquid opening pipe flows into the crucible, and then the cylinder 12 opens the mold and pushes out the casting.
1-holding furnace 2-liquid metal 3-crucible 4-liter liquid pipe 5-gate 6-sealing cover 7-lower type 8-cavity 9-upper-type
10 one ejector rod 11 one rod plate 12 one cylinder 13 one asbestos gasket