Hydroforming Process for an Ultrasmall Bending Radius Elbow

Table 1

Dimensions of rotary bending tools (mm).

Tool	Insert die	Clamp die	Pressure die	Wiper die	Mandrel shaft	Balls	Ball interval	Ball width
Length	126	126	126	126	126	3	20	10
Gap	0.12	0.12	0.12	0.12	0.3	0.3	0.3	0.3