中英文外文翻譯壓力鑄造-全文預(yù)覽
【正文】 是壓鑄的兩大特點。 2) To the concave and plicated casting, die casting is paratively difficult。 It is longelived to press the casting mould, one pair presses casting mould, the clock alloy of die casting, the lifespan can be up to hundreds of thousands times, very to up to a million times。 It is to cast out the aperture minimumly。 The intensity and hardness are relatively high, the intensity is generally cast and improved by 250% more than the sand mould, but the coefficient of elongation is reduced by about 70%。 Surface smooth finish is good, generally equivalent to 5 grades。 The aluminium alloy casting can reach 。 3 type horizontal cold empty die casting machine 8 hours on average but 600 70 times of die casting, smallscale hot laboratory cave die casting machine equally every eight hours but die casting 3000000。 Can adopt and make die casting up with other metal or nonmetallic materials . Assemble manhour save metal also sparingly. There are a lot of advantages in though die casting, but there are some shortings, to be solved. For instance: 1) Because one of speeds is high in the liquid metal filling with type at the time of die casting, the flow state is unstable, so adopt and generally press the cas
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