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在日常生产中,为了获得完好的铸件,必须在铸件的热节处安置较大的冒口。普通冒口由于采用与铸型相同的造型材料,所以两者的传热性能相同,尽管其几何尺寸很大,但有效尺寸较小。因此普通冒口的补缩效率很低,其缩孔体积占整个冒口体积的10～14％,而真正补缩给铸件的体积只有6～10％。冒口中绝大部分金属液实际上是一种消耗。如果对冒口采取保温措施,即可控制冒口中金属液的热损失、延长冒口凝固时间,强化补缩铸
In daily production, in order to obtain good castings, large risers must be placed in the heat sections of the castings. The common riser uses the same molding material as the mold, so both have the same heat transfer performance and, despite their large geometry, their effective size is small. Therefore, the efficiency of ordinary feeder riser is very low, the shrink hole volume of the entire riser volume of 10 to 14%, while the real complement to the casting volume of only 6 to 10%. The vast majority of molten metal riser is actually a consumption. If the riser to take insulation measures, you can control the riser in the liquid metal heat loss, to extend the riser solidification time, strengthen the shrink casting