abstract : for the square n side pipe, adopting diagonal coefficient method for the pipe roller design, it has the advantage of little procedure of design and no pre-assume parameter as well as calculated easy and accurately 文摘:对正n边形焊管采用对角线系数法进行孔型设计,具有设计步骤少,没有预先假设的参数,计算简便正确等特点。