When the shrinkage of the rod fracture surface much more than that of the cup part fracture surface, its formation by compound extrusion is not applicable.
当杆的断面收缩率比杯形部分断面收缩率大得较多时，不适合直接用复合挤压成形。
2
The effect of the technology and equipment, such as the structure and dimension of die plates, the extrusion conditions and so on, on the die swell and shrinkage of tread extrudate was described.