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

Table 9

Variance data table.

	A	B	C	D
T1	−88.0610	−88.8310	−88.8907	−88.7984	T = −365.7321
T2	−89.5877	−89.0986	−89.1681	−89.2755	ST = 0.6058
T3	−89.6109	−89.2247	−89.3220	−89.3031
T4	−89.4724	−89.5777	−89.3513	−89.3551
t1	−22.0153	−22.2078	−22.2227	−22.1996
t2	−22.3969	−22.2747	−22.2920	−22.3189
t3	−22.4027	−22.3062	−22.3305	−22.3258
t4	−22.3681	−22.3944	−22.3378	−22.3388
Range (R)	0.3875	0.1867	0.1151	0.1392
Wave (S)	0.4224	0.0721	0.0333	0.0501