20
8-3. Air Relief
Always perform the air relief work when supplying oil after disassembling the parts relating to the
clamping circuit and after a brake alarm occurs. If air relief is not sufficient, the specified clamp torque
cannot be attained and an alarm occurs.
8-3-1. Pneumatic clamp system (See Fig.3-1, Fig.3-2, Fig.3-3)
1) Tilt the rotating axis 90
°
from the horizontal state of table (0
°
) to make the table vertically.
2) Move the piston of the cylinder for the tilting axis or rotating axis (hereinafter referred to as piston) to
the returned edge. When the air is supplied with the solenoid valve ON at excitation unclamp
specification and with the solenoid valve OFF at excitation clamp specification, the piston moves the
returned edge.
3) Remove tank cover on air hydraulic part (hereinafter referred to as cover)
①
and fill the oil tank fully
with the specified hydraulic oil.
The hydraulic oil is reduced by the air relief work, so supply oil as
necessary when performing the work.
Air relief on rotating axis side
Bleed air on the rotating axis side at three points (
②
,
③
,
④
).
1
)
Slightly loosen the screw of air relief plug
②
with the table clamped to leak the hydraulic oil a little,
so as to bleed the bubbles (air) contained in the oil. After leaking the oil for a while, once tighten the
screw of
②
with the table clamped.
2
)
Repeat the clamp/unclamp operations in this state. At this time, bubbles come out on the oil tank
side. The hydraulic oil is filled in the primary side piping line and air is discharged by repeating the
clamp/unclamp operations. Check that bubbles on the tank side are eliminated by the air relief work
for the tilting axis and rotating axis.
3
)
Again, loosen the screw of
②
to leak hydraulic oil a little, so as to bleed the bubbles contained in the
oil. Repeat this operation until the bubbles disappear, and tighten the screw of
②
again.
4
)
Bleed the air by means of air relief plug
③
by the same procedure.
5
)
Then, bleed the air by means of air relief plug
④
by the same procedure.
6
)
Repeat the procedure until no bubbles are found in the leaking oil even if any screw of air relief plug
②
,
③
or
④
is loosened.
Air relief on tilting axis side
Bleed air on the tilting axis side at two points (
⑤
,
⑥
).
1
)
Bleed air using air relief plug
⑤
by the same procedure as step 1) of "Air relief on rotating axis
side".
2
)
Bleed the air by means of air relief plug
⑥
by the same procedure.
3
)
Repeat the procedure until no bubbles are found in the leaking oil even if any screw of air relief plug
⑤
or
⑥
is loosened.
4
)
After completion of the air relief work, supply hydraulic oil or adjust the oil level so that the oil level