Design of Hydraulic Bulging Die for Automobile Torsion Beam and Optimization of Forming Process Parameters

Table 3

Experimental design and results.

Test number	Factor				Indicator
	A	B	C	D	Maximum thinning rate	Maximum thickening rate
1	20	150	25	0.075	9.01	16.52
2	20	180	30	0.1	9.53	17.52
3	20	210	35	0.125	8.79	19
4	20	240	40	0.15	9.01	20.89
5	40	210	40	0.075	9.53	18.79
6	40	240	35	0.1	10.7	20.42
7	40	150	30	0.125	8.77	16.58
8	40	180	25	0.15	8.62	17.56
9	60	240	30	0.075	9.45	20.18
10	60	210	25	0.1	10.07	18.91
11	60	180	40	0.125	9.61	17.66
12	60	150	35	0.15	8.76	16.64
13	80	180	35	0.075	9.58	17.6
14	80	150	40	0.1	9.59	16.54
15	80	240	25	0.125	9.91	20.8
16	80	210	30	0.15	8.72	19.26