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1·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.

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。

2·The forging die of adjustable pliers has been analysed and improved from integral die to inserted type die which is convenient in striking and assembling and its pack-age is easy to be changed.

对管子钳钳口的锻模进行了分析改进，将整体式锻模改为拼装式锻模。