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

Table 2

The test parameters and results.

Test serial; number	Cold roll-beating; speed (r/min)	Feed rate; (mm/min)	Surface roughness; (μm)	Residual stress; (MPa)	Degree of hardening; (%)
1	1428	21	0.469	-67.42	140.96
2	1428	28	0.479	-72.70	143.35
3	1428	35	0.530	-79.38	145.83
4	1428	42	0.625	-83.01	148.71
5	1581	21	0.440	-68.76	140.25
6	1581	28	0.449	-75.16	143.06
7	1581	35	0.467	-78.79	144.91
8	1581	42	0.508	-83.11	146.79
9	1806	21	0.383	-72.15	138.78
10	1806	28	0.397	-75.65	142.26
11	1806	35	0.442	-79.49	143.48
12	1806	42	0.495	-84.83	145.95
13	2032	21	0.345	-73.04	138.41
14	2032	28	0.361	-79.04	141.43
15	2032	35	0.433	-82.77	142.64
16	2032	42	0.500	-84.76	145.03
17	2258	21	0.357	-74.75	138.11
18	2258	28	0.368	-78.58	139.37
19	2258	35	0.411	-83.25	141.93
20	2258	42	0.472	-84.87	144.11