Control system

7MPa

Doubleacting

Double acting clamp is controlled and operated with control unit model HCD□H-W and coupling valve model VCB.

Control unit model HCD□H-W

Coupling valve model VCB

Page →230

Pages →214, 215

Control unit (HCD□H-W) converts air pressure to hydraulic pressure by actuation of air driven Pascal pump. Once circuit pressure
is attained to the set pressure, it stops pumping then keeps the hydraulic pressure.
Coupling valve (VCB) is placed between a control unit and double acting clamps, and it allows to disconnect the control unit fromthe valve by means of hydraulic coupler. Built-in check valve in coupling valve can positively seal the pressure.

Clamping operation

Hydraulic pressure source disengagement (during processing)Work clamp (double acting)Work clamp (double acting)Coupling valve
model VCBWork clamp (double acting)Coupling valve
model VCB

Coupler

Coupling valve
model VCB

Coupler

Coupler

Workpiece

Switching valve

AirA

Control system

AB

Workpiece

Workpiece

Switching valve

B

Unclamping operation

AB

Control unit
model HCD□H-W

After coupler is connected, workpiece isclamped by aligning switching valve ofcontrol unit to B hydraulic port (clampingcircuit).

AB

Switching valve

AirA

Control unit
model HCD□H-WB

Coupler is released by aligning switchingvalve of control unit to center position after
workpiece clamping is completed.

Non-leak valve

Coupling valve
model VCB

AirA
B

Control unit
model HCD□H-W

After coupler is connected, workpiece is takenout by unclamping, which is made possibleby aligning switching valve of control unit toA hydraulic port (unclamping circuit).

Switching valve

Clamping circuit coupler
Hydraulic hoseB

Double acting clampAAir

Unclamping circuit coupler
Pascal pumpLine ﬁlter

Control unit model HCD□H-W

Since Pascal pump does not raise oil temperature like electrical pumps, it does not trigger pressure drop (reduction in clamping force) after
clamping due to difference between ambient temperature and oil temperature. Fluctuation of pressure due to changes in ambient temperature,
however, does occur. (This fluctuation presents minimal problems with ordinary cutting processes. Inquire for details.)

206

Control system

7MPa

DoubleactingReducing valve model VRG
Pages →220, 221

Internal hydraulic pressure of circuit can be partially reduced.
(Example) For work support 7 MPa (primary pressure)pressure of work clamp is reduced to 3.5 MPa.

Swing clamp(double acting clamp)
7MPa

Workpiece
7MPaWork support

7MPa

Reducing valve
model VRG

Swing clamp(double acting clamp)

Pages →220, 221

Coupling valve
model VCB

Control unit
model HCD□H-W

Pages →214, 215

Page →230

Control system

3.5MPaClamping circuit

Air
Unclamping circuit

Reducing valve
model VRG

Coupling valve
model VCB

Non-leak valve

Switching valve

Clamping circuit coupler
Hydraulic hose
BDouble acting clamp

AAir

Unclamping circuit coupler
Double acting clamp

Work support

Pascal pumpLine ﬁlter

Control unit model HCD□H-W

To download CAD data / To get updated information, visit www.pascaleng.co.jp

207

Control system

7MPa

Doubleacting

Sequence valve model VEF
Pages →222, 223

Clamps are sequentially operated through same circuit.
(Example) ① After clamping operation of work clamp② Work support operation locked.

Link clamp(double acting clamp)①

Work support

Workpiece②

Link clamp(double acting clamp)

Sequence valve
model VEF
Pages →222, 223①
Control unitmodel HCD□H-W
Page →230

Control system

Coupling valve
model VCB

Clamping circuit

Air

Unclamping circuit
Clamping pressure
detection L.S.

Non-leak valve

Coupling valve
model VCB

Switching valve

Clamping circuit coupler
Hydraulic hose
B

Double acting clamp
A

Double acting clamp

Sequence valve
model VEF

Unclamping circuit coupler
Pressure indicatorWork support

Pascal pumpLine ﬁlter

Control unit model HCD□H-W
Clamping pressure detection L.S.

208

AirControl system

7MPa

Pilot check valve model VCP

Accumulator model WPB, WPC

Page →216

Pages →224‒229

Doubleacting

It ensures the clamp circuit pressure positively retained

After hydraulic pressure source has been disengaged,

even when hydraulic unit provides zero pressure or

circuit pressure fluctuation due to temperature changes

pressure line is cut off, which can prevent the workpieceis suppressed.

fall or accident due to the clamp loose.

Swing clamp(double acting clamp)

Workpiece

Accumulator (spring)model WPB
Pages →224‒227

Swing clamp(double acting clamp)

Accumulator (N2 gas)model WPC
Pages →228, 229

Page →216

Control system

Pilot check valve
model VCPPal coupler

Pallet clamp

Pilot check valve
model VCP

Clamping circuit Pal coupler
0.3MPaClamping hydraulic pressure
Unclamping hydraulic pressure

Double acting clamp

0.3MPa‫ۃ‬

Double acting clamp

Unclamping circuit Pal coupler

Accumulator
model WPC

To download CAD data / To get updated information, visit www.pascaleng.co.jp

209