The Grey Theory Combining the Taguchi Method for the Best Parameters: A Case Study of Polishing M300 Steel

Table 3

Factors and levels of the polishing parameter optimization experiment.

	Process parameter	Unit	Level
			1	2	3
A	Grain size	/	320	600	1000
B	Grinding speed	r·min^−1	4500	6000	7500
C	Cutting depth	mm	0.1	0.2	0.4
D	Feed rate	mm/s	40	80	160
	Polishing line spacing		1
	Processing cycles		3