Optimization of AL6061-T6 Tube End Forming Process Using Response Surface Method

Table 4

The design levels of the selected input variables.

Controllable variable	Notation	Unit	-1	0	1
Roller inclination angle		—	0	7.5	15
Depth of contact point between inclined roller and tube		mm	3	6	9
Radius of mandrel’s curvature/fillet		mm	40	50	60
Roller diameter		mm	100	140	180
Tube rotational speed		rpm	400	800	1200