Unclamping Of The Workpiece - Bison 2500 Instruction Manual

5.2

unclamping of the workpiece

The compressed air that flows into the
'unclamping' chamber of the pressure distributor
causes a deformation of the profile seal, while
sealing the connection of a distributor and chuck
body, then the air flows through a non-return valve
– resulting in:
■ Connection of the cylinder 'clamping'
chamber with the atmosphere,
■ The air flows into the cylinder 'unclamping'
chamber while displacing the position of
the piston - connected permanently with the
pulling sleeve, which drives the master jaw
through the wedge system,
■ The two-angle wedge system, provides jaw
working motion with two speeds:
– slow motion (short jaw stroke),
– rapid idle stroke (long jaw stroke).
■ The above results in clamping of the
workpiece.
The compressed air supply cut-off in the
distributor chamber is causing:
■ Profiled seal returns to its original position
(seal moves out from the surface of chuck
body,
■ The non-return valve cuts-off the connection
of the supplied cylinder chamber with
pressure distributor,
■ the non-return valve maintains the
pressure in the cylinder chamber (after
power cut-off, the air in the chamber is
under pressure).
The workpiece is unclamped.
8
chucks type 2500 are equipped with control
devices:
1. jaw stroke control device
■ the workpiece is clamped correctly, when the
control device arbor is in outward position,
■ the control device arbor is in inward position
when:
– jaws are in the range of the rapid idle
stroke,
– jaws are in the end-point clamping range.
2. air pressure control device in the ,clamping'
chamber
■ when the pressure in the ‚clamping' chamber
is set correctly - the control device arbor is in
inward position,
■ the pressure drop in the ‚clamping' chamber
below the minimum set value (default setting of
the minimum pressure at 0,35 [MPa]) effects of
ejecting the control device arbor outwards.
The control devices should be integrated with the machine
safety control system, that prevents from operating, when
the pressure in the cylinder chamber or clamping of the
workpiece is incorrect.
The control device arbors have M6 holes designed for
clamping of any parts working with the proximity switch
devices (Fig. 1.).
!
NotE: Never clamp the workpiece when the
jaws are in the range of the rapid idle stroke
or in the end-point of the clamping range (the
jaw stroke control device arbor is in inward
position).