发热冒口是为避免铸件出现缺陷而附加在铸件上方或侧面的补充部分，其补缩效果远高于漂珠保温冒口， 发热冒口铸件致密无缺陷，完全符合爆炸硬化的基础技术要求。同时优良的致密度即内部质量， 为提高铸件的耐磨性、 延长辙叉的使用寿命提供了有力保障。
根据体收缩原则，研究了适用于模具镶块铸钢件加发热覆盖剂保温的冒口设计工艺。
Based on the principle of volume contraction of freezing, the designing process of riser fitting to the cast steel inserted die with exothermic covering flux has been studied.
采用发热保温冒口，由于冒口的补缩效率提高，缩松倾向明显减少。
The distribution of porosity defects can be reduced to the least by using exothermic insulating riser.
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