泥型在浇注后,等浇胃口杯中的鉄水凝固但未完全成固体时就将浇冒口杯铲去。这样对以后开箱要方便些。从浇注到开箱这一段时間的长短对鑄件和鑄型都很重要,如开箱太早,鑄件在空气中激冷,可能产生裂紋和变形;如开箱太迟,鑄型过分受热,又会縮短了泥型的使用寿命。一般鑄件的开箱时間是在浇鑄后的15～25分鐘,10吨以上的鑄件是30～40分鐘。在使用土铁浇注时,由于土铁的碳、硅含量低,磷、硫含量高,鑄件容易产生 Mud type in the pouring, such as pouring in the mouth of the cup of stagnant water, but not completely into a solid when the spoon will be spreaded. This will be easier for the future out of the box. From casting to unpacking this period of time is very important for castings and molds, such as opening the box too early, the casting chilled in the air, may produce cracks and deformation; such as unpacking too late, the mold is too hot, It will shorten the mud-type life. Unpacking time of general castings is 15 to 25 minutes after casting, and castings of 10 tons or more are 30 to 40 minutes. In the use of soil iron pouring, due to iron soil carbon, silicon content is low, phosphorus, sulfur content is high, prone to casting