請問一下為什麼die casting 能被用來產生part with thin section??但是sand casting卻
- 1 decade agoFavorite Answer
Sand casting is used to make large parts (typically Iron, but also Bronze, Brass, Aluminum). Molten metal is poured into a mold cavity formed out of sand (natural or synthetic).
Die-casting is similar to permanent mold casting except that the metal is injected into the mold under high pressure of 10-210Mpa (1,450-30,500) psi . This results in a more uniform part, generally good surface finish and good dimensional accuracy, as good as 0.2 % of casting dimension. For many parts, post-machining can be totally eliminated, or very light machining may be required to bring dimensions to size.
也就是說，主要是熔金屬性質的關係。sand casting 一般來說用來做大的元件，因為熔金屬流動的時候有黏性viscosity 和表面張力會阻擋熔金屬進入小的空間。所以無法做小的元件/part with thin section。
而die casting 因為熔金屬是加壓鑄入，所以可以將溶金屬擠入小空間/ thin section。所產生的元件密度和表面光滑度也比 sand casting高。