我厂的产品零件中,有一批直径(?)12.6毫米、壁厚0.7毫米、长57毫米的感应塞黄铜套管。过去加工需经过六次拉伸和四次中间退火,生产周期长,机床利用率很低,成本高;同时,随着工件的拉伸变长,就需要行程较大的大吨位机床,因此劳动强度也大。 I plant a number of products, there are a number of diameter (?) 12.6 mm, wall thickness 0.7 mm, length 57 mm induction plug brass sleeve. In the past, the processing required six times of drawing and four times of intermediate annealing, the production cycle was long, the machine utilization rate was very low and the cost was high. At the same time, as the work piece stretched longer, large-tonnage machine tool with larger stroke was needed, Strength is also great.