Gray Relational Optimization of the Surface Performance of Splines Formed by Cold Roll-Beating

Table 6

Horizontal average gray correlative degree of the cold roll-beating spline-forming process parameters.

Processing parameter	Average gray correlation degree					η (max. - min.)
	Level 1	Level 2	Level 3	Level 4	Level 5
Cold roll speed	0.1849	0.1832	0.1928	0.2057	0.2024	0.0225
Feed speed	0.1646	0.1817	0.1968	0.2321	- - -	0.0676