|
TABLE 18: CENTERLESS GRINDING OF NIOBIUM
|
WHEEL SPEED
|
THRUFEED
OF WORK
|
INFEED
On Diameter
|
WHEEL
IDENTIFICATION
|
|
fpm |
in/min
|
in/pass
|
ANSI |
|
(m/s)
|
(m/min)
|
(mm/pass)
|
(ISO)
|
|
4000 |
50 — 150
|
Rough: 0.001
Finish: 0.0005 max
|
A60LV |
|
(20) |
(1.3 — 3.8)
|
(Rough: 0.025)
(Finish: 0.013 max)
|
(A60LV) |
Sawing
No special considerations are necessary
when sawing niobium and its alloys. High-speed steel blades
can be used with power hacksaws, band saws, and circular saws.
Sawing data is given in Tables 19 Ð 21.
TABLE 19: POWER HACK SAWING OF NIOBIUM
|
MATERIAL THICKNESS
in
(mm)
|
TEETH PER INCH
pitch°
(mm)
|
SPEED
strokes/min
(strokes/min)
|
FEED
in/stroke
(mm/stroke)
|
PRESSURE
|
|
< .25 |
10 |
60 |
0.003 |
Light |
|
.25 - .75 |
10 |
60 |
0.003 |
Light |
|
.75 - 3 |
6 |
55 |
0.006 |
Medium |
|
> 2 |
4 |
55 |
0.006 |
Medium |
|
(< 6) |
(2.5) |
(60) |
(0.075) |
(Light) |
|
(6 — 18)
|
(2.5) |
(60) |
(0.075) |
(Light) |
|
(18 - 50) |
(4) |
(55) |
(0.15) |
(Medium) |
|
(> 50) |
(6.3) |
(55) |
(0.15) |
(Medium) |
TABLE 20: BAND SAWING OF NIOBIUM
|
MATERIAL THICKNESS
in
(mm)
|
TOOTH FORM
|
TEETH PER INCH
pitch
(mm)
|
BAND SPEED
fpm
(m/min)
|
|
< .50 |
precision |
14 |
100 |
|
.50 - 1 |
precision |
10 |
90 |
|
1 — 3 |
precision |
8 |
75 |
|
> 3 |
precision |
6 |
65 |
|
(<12) |
(precision) |
(1.8) |
(30) |
|
(12 — 25)
|
(precision) |
(2.5) |
(27) |
|
(25 — 75)
|
(precision) |
(3) |
(23) |
|
(>75) |
(precision) |
(4) |
(20) |
Nine of Eleven 1
2 3
4 5
6 7
8 9 10
11
|
