Material Removal Rate, Electrode Wear Rate, and Surface Roughness Evaluation in Die Sinking EDM with Hollow Tool through Response Surface Methodology
Table 3
Factors and their responses.
Run number
Factors
Responses
Pulse off time (s)
Pulse on time (s)
Pulse current (A)
Material removal rate MRR (mm3/min)
Electrode wear rate EWR (mm3/min)
Surface roughness SR (m)
1
28
340
5
14.6
4.7
5.39
2
4
340
5
23.37
11.6
6.3
3
16
340
25
18.25
7.4
7.22
4
28
340
45
20.96
12.9
6.25
5
16
340
25
18.85
5.7
7.45
6
16
340
25
19.55
7.2
7.57
7
4
580
25
28.99
13.8
10.12
8
4
100
25
14.53
3.5
5.42
9
16
340
25
18.86
5.8
7.23
10
16
580
45
29.03
10.2
10.16
11
16
100
5
14
3.9
4.28
12
16
580
5
26.42
10.9
9.15
13
16
100
45
16.16
4.1
5.34
14
28
100
25
15.66
3.5
4.33
15
16
340
25
17.8
5.9
7.43
16
4
340
45
22.2
7.2
7.73
17
28
580
25
24.36
10.4
9.2
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