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Low-pressure casting月為
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It refers to the casting method t在鐵hat the mold is generally pl河樹aced above the sealed cru討火cible, and the crucible is filled with著器 compressed air, which cau志民ses low pressure (0.06-0.15M動長Pa) on the surface of molt訊房en metal, so that 場懂the liquid metal rises f風區rom the riser to fill答一 the mold and control the solidif媽的ication. With goo我相d shrinkage and compact ca線喝sting structure, this c制這asting method is e頻市asy to cast large and complex thin-在年walled castings witho在金ut riser, and the metal 暗地yield is up to 95%. No pollution is 可議generated, and it is easy學吃 to realize automation. However, the 雪上equipment cost is high and t校民he production efficiency is 是高low. It is generally u雨靜sed for casting non-fer議銀rous alloys.
● Principles
Low-pressure casting is a c那路asting method that the liquid all草自oy is pressed into the mold cavity 南視from bottom to top under pre暗問ssure and solidified under pre站子ssure to obtain 費日castings. The principle of low-press間離ure casting is shown 都土in Figure 1 Principle of Low Pres件車sure Casting. The sealed crucible is fi坐著lled with dry compressed air or iner國又t gas. With the help of the pr科城essure acting on the metal sur鄉廠face, the molten m林章etal is filled with the mold smoothl不輛y from bottom to 訊物top along the ris藍秒er through the runner. The fillin問員g pressure is generally 2玩近0-60kPa. When the cas暗體ting is complete懂腦ly solidified, the gas技物 pressure on the l鐘農iquid surface is區來 released, so that the met湖銀al liquid without solidific如得ation in the riser pipe and runn就明er flows into the crucible by it刀日s own weight, and then the c也民ast is opened a行是nd the casting is remo書現ved.
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