Studies on the Die Casting of Ferrous Alloys

从成品率的角度来看，压铸被认为是一种有效的生产方法。因此，作为铜合金或铝合金，这种方法被广泛使用。但由于铁合金熔点较高，模具、容器、套筒寿命较短，这种方法没有得到广泛应用。为了将压铸扩展到铁合金领域，开发了陶瓷模具、陶瓷容器和陶瓷套材料，并对其加工工艺进行了试验研究。所得结果如下：(1)氮化硅、碳化硅、碳纤维增强氧化铝适合做模具、容器、套筒材料。(2)激光退火，在陶瓷表面照射YAG激光，可以去除气孔，得到平整的表面。(3)单晶金刚石刀具在切割陶瓷时磨损严重。而气相沉积的PCD金刚石寿命较长。(4)以硼硅玻璃为结合材料的陶瓷结合金刚石砂轮具有足够的磨削性能，可加工这些陶瓷材料。

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.