Studies on the Die Casting of Ferrous Alloys

从成品率的角度来看，压铸被认为是有效的生产方法。因此，对于铜合金或铝合金，该方法被广泛使用。但由于铁基合金熔点较高，模具、容腔和套的寿命较短，因此，这种方法并没有得到广泛的应用，为了将压铸工艺推广到铁基合金，本文研制了铁基合金模具、容腔和套的陶瓷材料，并对其加工工艺进行了实验研究。获得的结果如下。(1)氮化硅、碳化硅和碳纤维增强氧化铝适合用作模具、容器和套筒材料。(2)激光退火是将YAG激光照射到陶瓷表面，可以消除气孔，获得平整的表面。(3)单晶金刚石刀具在切削陶瓷时会产生磨损。而气相沉积的PCD金刚石寿命长。(4)以硼硅酸盐玻璃为结合剂的陶瓷结合剂金刚石砂轮具有足够的磨削性能来加工这些陶瓷材料。

Die casting has been said to be effective production method from a yield rate point of view. Therefore as copper alloys or aluminum alloys, this method is widely used. But as ferrous alloys, their melting point are relatively high and die, container and sleeve are short-lived, this method does not come into wide use.In this study, in order to extend the die casting to ferrous alloys, ceramic materials for die, container and sleeve are developed and their machining proce sses are experimentally studied. Results obtained are as follows.(1) Silicon nitride, silicon carbide and carbon fiber reinforced alumina are suitable as die, container and sleeve materials.(2) Laser annealing, irradiating YAG laser light on ceramic surfaces, can remove pores and can get plain surfaces.(3) Single crystal diamond tool wears beavily during cutting ceramics. But PCD diamond deposited from gas phase is long-lived.(4) Vitrified bonded diamond wheel used borosilicate glass as binding material has sufficient grinding performance to process these ceramic materials.