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Low-pressure casting
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Product Descripti員的on
It refers to the 公商casting method that the m商好old is generally pl輛器aced above the sealed cru白很cible, and the cruc報還ible is filled with化舊 compressed air, which causes low pr女雪essure (0.06-0.15MPa) o什北n the surface of molten metal, so th拍術at the liquid metal rises from the rise鄉現r to fill the mold and control th腦懂e solidification. With goo黃呢d shrinkage and compact casting st了歌ructure, this casting跳票 method is easy to cast 玩光large and complex thin-walled castin紙樹gs without riser, and the m術得etal yield is up to 95%. N物區o pollution is generated, and it is河森 easy to realize automati麗車on. However, the equipmen笑是t cost is high and t家木he production efficiency is low. It 河土is generally used for熱議 casting non-ferrous alloys.
● Principles
Low-pressure castin紅不g is a casting me鄉坐thod that the liquid allo坐明y is pressed into the mold cavity fr數通om bottom to top unde錢就r pressure and solidified under pressur雜師e to obtain cas讀短tings. The princi雨信ple of low-pressure casting i為北s shown in Figure 1 Pr照線inciple of Low Pressure Casting. The s國看ealed crucible is filled with 為又dry compressed air or inert gas. W體相ith the help of the pressure 嗎森acting on the metal surface, the內得 molten metal is filled 問票with the mold smo他校othly from botto友坐m to top along the riser through t長開he runner. The filling pressure is秒場 generally 20-6員唱0kPa. When the casting場理 is completely solidified, the 就行gas pressure on the liquid s笑個urface is released,農她 so that the metal liquid人看 without solidificatio校作n in the riser pipe and runn鄉海er flows into t低姐he crucible by its own weight,對笑 and then the cast is open吧個ed and the casting is美票 removed.
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