|
TABLE 13: BORING OF NIOBIUM
| DEPTH
OF CUT
in
(mm)
|
TOOL
MATERIAL
AISI
(ISO)
|
Carbide Tool
SPEED
fpm
(m/min)
|
FEED
ipr
(mm/r)
|
TOOL
MATERIAL
AISI
(ISO)
|
High
Speed
Steel Tool
SPEED
fpm
(m/min)
|
FEED
ipr
(mm/r)
|
| 0.010
|
C-2
|
280
|
0.002
|
M2,
M3 |
80
|
0.002
|
| 0.050
|
C-2
|
225
|
0.004
|
M2,
M3 |
65
|
0.004
|
| 0.100
|
C-2
|
175
|
0.005
|
M2,
M3 |
55
|
0.005
|
| (0.25)
|
(K20,
M20) |
(85)
|
(0.050)
|
(S4,
S5) |
(24)
|
(0.050)
|
| (1.25)
|
(K20,
M20) |
(69)
|
(0.102)
|
(S4,
S5) |
(20)
|
(0.102)
|
| (2.5)
|
(K20,
M20) |
(53)
|
(0.13)
|
(S4,
S5) |
(17)
|
(0.13)
|
TABLE 14: REAMING OF NIOBIUM
| TOOL
|
SPEED
|
FEED
ipr (mm/r)
Reamer Diameter
|
| AISI
or C |
Fpm
|
1/8
in |
1/4
in |
1/2
in |
1
in |
1-1/2
in |
2
in |
| (ISO)
|
(mm/min)
|
(3mm)
|
(6mm)
|
(12mm)
|
(25mm)
|
(35mm)
|
(50mm)
|
| M1,
M2, M7 |
90
(rough), 40 (finish) |
.003
|
.004
|
.006
|
.008
|
.009
|
.010
|
| C-2
|
120
(rough), 60 (finish) |
.004
|
.005
|
.007
|
.009
|
.011
|
.012
|
| (S2,
S3, S4) |
27
(rough), 12 (finish) |
(.075)
|
(.102)
|
(.15)
|
(.20)
|
(.23)
|
(.25)
|
| (K20)
|
37
(rough), 18 (finish) |
(.102)
|
(.13)
|
(.18)
|
(.23)
|
(.28)
|
(.30)
|
Grinding
Niobium and its alloys can be difficult
to grind. Most grinding wheels will quickly load, making selection
and application of grinding fluid crucial to obtaining a good
finish. Care must also be taken to prevent the metal surface
from heating up during grinding to prevent a surface hydrogen
pickup. Specific guidelines for the different grinding types
are shown in Tables 15 Ð 18.
Seven of Eleven 1
2 3
4 5
6 7 8
9 10
11
|
