The Fast Drawing of Mandril in Bending Tube by Using AutoCAD

This paper brings forward a means of fast drawing of the mandril's structure in bending tube by using AutoCAD. In the means ,the mandrils with various bending radiuses ,or various bending angles ,or various chickness of tube wall can be designed fleetly, and the mandrils not only are of rigorous size ,scientific structure ,long life but also can be produced easily?