铸造-------毕业设计翻译(外文原文+中文翻译).doc

Metal casting processes divide into two categories based
on mold type: (l) expendable mold and (2) permanent
mold. In expendable mold casting operations. the mold is
sacrificed in order to remove the cast part. Since a new
mold is required for each new casting, production rates in
expendable-mold processes arc often limited by the time
required to make the mold rather than the time to make the
casting itself. However, for certain part geometries, sand
molds can be produced and castings made at rates of 400
parts per hour and higher. In permanent-mold casting
processes the mold is fabricated out of metal (or other
durable material) and can be used many times to make
many castings. Accordingly, these processes possess a nat-
ural advantage in terms of higher production rates.
金属铸造生产工艺分为两大类的基础模具型: (l) 消耗型模具和(2) 永久型模具。在消耗型铸造业务中，模具必须切除多余的部分。因为一个全新的模具需要每一个全新的铸件，在消耗型模具生产率过程中要求做模具常常受制于时间，而不是做铸件本身的时间。然而,对于某些部分几何学,沙型模具和铸件可产生了以400部每小时的速度或更高。在永久型模具铸造工艺的模具制作金属(或其他耐用的材料),很多时候能用与做一些铸件。因此,这些工艺过程就更高的生产率而言具有天然的优势。