Study of Manufacturing Process of Holes in Aeroengine Heat Shield

Table 2

Five-factor four-level orthogonal table.

Factors	Defocusing distance (mm)	Cutting speed (mm/min)	Current (A)	Pulse width (ms)	Frequency (Hz)
Level
Name
1	-1.0	100	190	0.8	70
2	-0.75	150	200	0.9	75
3	-0.5	200	210	1.0	80
4	-0.25	250	220	1.1	85