As the progress that mechanization produces, machine shoemaking craft asks insole must shape beforehand, made formation is the same as the radian with identical bottom of last for shaping a shoe.

• 随着机械化生产的发展,机器制鞋工艺要求内底必须预先成型,使之形成同鞋楦底部完全相同的弧度。这种对内底进行成型加工的设备就是内底成型机。