Sandvik Coromant Heat resistant super alloys - Manual (Page 83)

81
50
40
30
20
10
0
Immersion ratio (a
e
/D
c
)
The diagram below shows that milling with large percentage radial immersion, has
restricted tool life at the aggressive condition of 75% a
e
/D
c
.
Tool R390-025A25-11H, Insert GC2040 E-ML,
z
n
4, D
c
25 mm, v
c
30 m/min, a
e
12.5 mm (50% of D
c
), h
ex
0.1 mm, a
p
5 mm,
Material: Inconel 718 (40 HRC)
Minutes in cut
f
z
0.12 mm f
z
0.1 mm f
z
0.1 mm
a
e
6.25 mm (25% of D
c
) a
e
12.5 mm (50% of D
c
) a
e
18.75 mm (75% of D
c
)
= Average time in cut
= Average volume removed
Total metal removed, cm 3
Recommendation – recommended immersion ratio for insert under 50%
giving maximum metal removal rates.
200
160
120
80
40
0