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Low-pressure cast廠還ing
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It refers to the casting m低姐ethod that the mold is genera林科lly placed above the sealed crucible, a錯要nd the crucible is filled with co票北mpressed air, which causes lo火子w pressure (0.06-0.15MPa) on亮答 the surface of molten 報花metal, so that the金票 liquid metal rises志地 from the riser to fill the 中頻mold and control the solidi就姐fication. With good shri學近nkage and compact castin吃個g structure, this 頻女casting method is easy風去 to cast large a水讀nd complex thin-村能walled castings wi靜討thout riser, and the metal yield is數習 up to 95%. No pollu熱秒tion is generated, and it is easy票的 to realize automation. However,問費 the equipment cost is 新門high and the production 煙劇efficiency is low.謝嗎 It is generally used懂都 for casting no影化n-ferrous alloys拿用.
● Principles
Low-pressure casting is a casting metho事麗d that the liquid alloy is pressed i去雪nto the mold cavity from bot玩區tom to top under pressure and solidifie裡離d under pressure to obtain c快湖astings. The princ睡見iple of low-pressure casting is sh讀愛own in Figure 1 Principle 國輛of Low Pressure Casting. T身些he sealed crucible is 服機filled with dry compressed air or iner關和t gas. With the help of the pressure房兵 acting on the metal surface, 技場the molten metal is filled with the mol友懂d smoothly from bottom to top alo嗎機ng the riser through t體熱he runner. The filling p麗湖ressure is generally 20-60kPa. When是議 the casting is complete美藍ly solidified, 師志the gas pressure on the liquid surface 習能is released, so that the metal li著分quid without solidification in the 計個riser pipe and runner flows into 慢靜the crucible by its own weight, 公河and then the cast 黃下is opened and the casting is removed笑雜.
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