使用膨胀型复合模铸保护渣保护浇注钢锭，普遍存在的一个问题是容易使钢锭产生头部积渣这一表面缺陷。
A general problem in protecting the casting ingots by using expanded complex mould casting mold powder is the surface defect that slag deposition can be evolved easily in ingots head.
从冶炼、浇注、锻造、热处理、机械加工等方面对复合镶套轧辊的制造过程进行了介绍。
This article has described the manufacturing process of the compound bushing rolls in the aspect of melting, pouring, forging, heat treatment and machining.
详细介绍了采取顶注式浇注系统、成形外冷铁、复合铸型、组芯造型的铸造工艺，成功地生产出批量铝叶轮。
The casting technique with top gating system, outer shaped iron chill, compound casting mold and core assembly molding was used for producing aluminum impeller on a large scale successfully.
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