Optimization of Process Parameters of Stamping Forming of the Automotive Lower Floor Board

Table 5

Range analysis of thickness reduction and thinness reduction data.

Factors	Maximum thinning rate/%				Maximum thickening rate/%
		88.64	99.74	95.81	89.47	18.95	16.35	16.78	18.12
	94.54	94.17	94.89	90.77	17.08	18.05	17.15	17.40
	97.87	87.14	90.35	100.81	15.36	16.72	17.46	15.87
	29.55	33.25	31.94	29.82	6.32	5.45	5.59	6.04
	31.51	31.39	31.63	30.26	5.69	6.11	5.72	5.80
	32.62	29.05	30.12	33.60	5.12	5.57	5.82	5.29
	3.08	4.20	1.82	3.78	1.20	0.66	0.23	0.75
Optimal levels
Primary and secondary order
Optimal combination