采用直接水冷半连续铸造法(D.C法)生产铝合金铸锭已有半个世纪了.这种方法和铁模铸造相比优点甚多,但是半连续铸锭的表面易于产生偏析瘤、拉痕和冷隔等缺陷,在继续加工以前不得不进行车皮,其车屑量竟达6-7%.这是不可忽视的损耗.文献对上述缺陷形成的机理进行过研究,指出:这些缺陷的产生与熔体金属同模壁的接触有关,若采用控制铸模的热传导或无接触铸造法,会使这些缺陷减小或完全消除.在研究产生缺陷机理的同时设计、试验和使用了多种铸造法,如热顶铸造、绝热模和电磁铸造等. The production of aluminum alloy ingot by direct water-cooled semi-continuous casting method (DC method) has been for more than half a century.This method has many advantages over iron die casting, but the surface of semi-continuous ingot is prone to segregation, And cold insulation and other defects, in the continued processing had to wagon, the car as much as 6-7% of the amount of scrap. This is a loss can not be ignored. Literature on the mechanism of the above defects were studied, pointed out: the occurrence of these defects And molten metal with the same mold wall contact, if the use of control of the mold heat conduction or non-contact casting method, these defects will be reduced or completely eliminated.In the study of the defect mechanism at the same time designed, tested and used a variety of casting method , Such as hot top casting, insulation mold and electromagnetic casting.