[Retracted] Green Machining Characteristics Study of Al-6063 in CNC Milling Using Taguchi Method and Grey Relational Analysis

Table 12

Grey regression analysis-MQL.

Exp	Dry runs		Normalization		Deviation sequence		Coefficients		Grade	Rank
	Ra	MRR	Ra	MRR	Ra	MRR	Ra	MRR
1	0.76	0.779	0.965	0.711	0.035	0.289	0.935	0.634	0.784	4
2	1.13	1.311	0.706	0.411	0.294	0.589	0.630	0.459	0.545	5
3	2.14	2.042	0.000	0.000	1.000	1.000	0.333	0.333	0.333	9
4	0.78	0.643	0.951	0.787	0.049	0.213	0.911	0.702	0.806	3
5	1.42	1.412	0.503	0.355	0.497	0.645	0.502	0.437	0.469	7
6	1.98	1.923	0.112	0.067	0.888	0.933	0.360	0.349	0.355	8
7	0.71	0.265	1.000	1.000	0.000	0.000	1.000	1.000	1.000	1
8	0.73	0.33	0.986	0.963	0.014	0.037	0.973	0.932	0.952	2
9	1.37	1.115	0.538	0.522	0.462	0.478	0.520	0.511	0.516	6