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在铸锭质量研究的基础上对某厂的保温帽结构和材质进行改良。具体的措施为:增加保温帽厚度、减小保温帽内壁与垂直方向的夹角、改良绝热材料的配方等。试验结果表明,改良后的保温帽能减少铸锭的疏松缺陷,提高产品合格率。但不能解决因锭尾和横向的凝固速度而导致的内部枝晶缺陷和中心缺陷等问题。宜通过改善铸模的结构来降低铸锭横向和尾部的温度梯度,以及在精炼等方面努力控制缺陷的数量。
Based on the research of ingot quality, the structure and material of the insulation cap of a factory are improved. Specific measures are as follows: increasing the thickness of the thermal insulation cap, reducing the angle between the inner wall of the thermal insulation cap and the vertical direction, and improving the formulation of the thermal insulation material. The test results show that the improved thermal insulation cap can reduce the loose defects of the ingot and improve the product qualification rate. But can not solve the problem of internal dendrite defects and center defects caused by the solidification speed at the tail and the transverse direction. It is desirable to reduce the temperature gradients across and in the ingot by improving the structure of the casting mold and to try to control the number of defects in refining and the like.