我厂在400公斤空气锤上锻造图1齿轮的毛坯时,过去虽然也采用胎模锻造,但是,只锻成图2形状,加工余量大,一般都在5～7毫米。去年以来,我们从锻造工艺方面作了改进,现在毛坯的加工余量都在2～3毫米以内。现将改进后的工艺方法介绍如下: I plant in the air hammer on the 400 kg Figure 1 gear blank, the past although the use of fetal die forging, but only forged into Figure 2 shape, machining allowance, are generally 5 to 7 mm. Since last year, we have made improvements from the forging process, and now rough machining allowances are within 2 ~ 3 mm. The improved technology is introduced as follows: