|
MACHINING OPERATIONS, (CONT.)
Grinding Both wheel grinding and belt
grinding can be used for zirconium. For wheel grinding, conventional
speeds and feeds are satisfactory with silicon carbide wheels
giving better results than aluminum oxide. The effect of grinding
fluid on zirconium is the same as on other metals; grinding
oils alone produce higher grinding ratios than water miscible
fluids, which means less wheel breakdown and finer finishes.
Recommended operating set-points are given in Tables 14-17.
In belt grinding zirconium, belt speed
and contact wheel selection are the key considerations. Contact
wheels should be relatively hard and aggressive. Soluble oil
coolants alone, or mixed with water and applied in a flood,
are recommended. Resin abrasive cloth may be used with oil
and rubber contact wheels on general polishing operations,
while Resin Industrial Cloth Type 3 or Type 6 are recommended
for use with oil in grinding operations where high grinding
pressures are used. Similarly, waterproof cloth silicon carbide
for light work and aluminum oxide for heavy work may be effectively
employed with soluble oil and water coolants.
TABLE 14: SURFACE GRINDING OF ZIRCONIUM
|
WHEEL
SPEED |
TABLE
SPEED |
DOWNFEED
|
CROSSFEED
|
WHEEL
IDENTIFICATION
|
|
fpm |
fpm |
in/pass
|
in/pass
|
ANSI |
|
(m/s)
|
(m/min)
|
(mm/pass)
|
(mm/pass)
|
(ISO)
|
|
3000 |
40 |
Rough: 0.001
Finish: 0.0005 max
|
0.040 — 0.400
max=1/6 of wheel width
|
C46JV |
|
(15) |
(12) |
(Rough: 0.025)
(Finish: 0.013 max)
|
(1.0 — 10.0)
(max=1/6 of wheel width)
|
C46JV |
TABLE 15: CYLINDRICAL GRINDING OF ZIRCONIUM
|
WHEEL
SPEED |
WORK
SPEED |
INFEED
On Diameter
|
TRAVERSE
|
WHEEL
IDENTIFICATION
|
|
fpm |
fpm |
in/pass
|
wheel width per
|
ANSI |
|
(m/s)
|
(m/min)
|
(mm/pass)
|
revolution of work
|
(ISO)
|
|
3000 |
60 — 100
|
Rough: 0.001
Finish: 0.0005 max
|
1/6 — 1/12
|
C60KV or
CA60PB |
|
(15) |
(18 - 30) |
(Rough: 0.025)
(Finish: 0.013max)
|
(1/6 — 1/12)
|
(C60KV or
CA60PB) |
Seven of Ten 1
2 3
4
5 6 7 8
9 10
|
