draft

The results show that the wall thickness reduction ε is the key factor if the design parameters of both drawing die and plug remainunchanged, and ε=25.

研究结果表明,内外模设计参数一定,管料的筋底壁厚压下率ε是凸筋成形的关键,ε=25％—30％ 有利于凸筋成形;管料壁厚不均度δD 对凸筋成形有重要的影响,δD<0。