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Low-pressure cast要一ing
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It refers to the 大要casting method that the mol銀聽d is generally placed ab技大ove the sealed crucible, and the 城月crucible is filled with 媽村compressed air, which ca歌歌uses low pressure (0.06-0.15MP討和a) on the surface of molten metal, so 他舊that the liquid me做鄉tal rises from the riser t船化o fill the mold and 歌計control the solid湖答ification. With good shrinkage and 民吃compact casting structur房吃e, this casting method快上 is easy to cast large an開刀d complex thin-walled castings 土服without riser, and the 術關metal yield is up to 95%. No pollut謝藍ion is generated, and it is書銀 easy to realize船好 automation. Howeve林厭r, the equipment cost is通房 high and the p麗土roduction efficiency is low. It is g習呢enerally used for casting non-ferro就話us alloys.
● Principles
Low-pressure casting is 他費a casting method that the liqui答懂d alloy is pressed into th錯鐵e mold cavity from bottom to算討 top under pressure費她 and solidified under pressure to obt些有ain castings. Th務坐e principle of low-pres在舊sure casting is shown in Figure 門拿1 Principle of Lo跳子w Pressure Casting. The seal到文ed crucible is filled with dr喝光y compressed air o員聽r inert gas. With the help of th話腦e pressure acting on the metal surface,鐵火 the molten metal is 友志filled with the mold smoothly from bo了可ttom to top along the riser 姐子through the runner. The filling p中物ressure is generall車上y 20-60kPa. When the ca樹開sting is completely s白去olidified, the g冷章as pressure on the liquid su購雨rface is released, so that the meta事美l liquid without solidificat視哥ion in the riser pipe and runner flows朋熱 into the crucible by its 笑畫own weight, and then the 資我cast is opened and t短畫he casting is removed.
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