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金属液体在凝固过程中都有不同程度的体积收缩,为了使铸件内部致密,在铸件上需设置冒口,其作用是:1)以其中一部份钢水补充铸件,消除铸件本身因凝固收缩而产生的缩孔,此部份钢水约占冒口重的15～20％;2)以其中大部份钢水来保持足够的热量使冒口最后凝固。因此,一般冒口重量常占铸件重量的25～60％,齿轮等铸件,冒口重有时达到铸件重量的100％,使铸件的工艺成品率仅达50～60％。因此,提高冒
Metallic liquid in the solidification process has varying degrees of volume contraction, in order to make the internal dense castings, castings need to set riser, its role is: 1) part of the molten steel to add castings to eliminate the casting itself due to condensation and shrinkage Resulting in shrinkage, this part of the molten steel accounts for about 15 to 20% of riser weight; 2) Most of the molten steel to keep enough heat so that the risers finally solidified. Therefore, the general riser weight often accounts for 25 ~ 60% of the weight of castings, gears and other castings, riser weights sometimes reach 100% of the weight of the castings, the casting process yield of only 50 to 60%. Therefore, improve the risk