CGU- F2□□□

Expansion clamp Eccentric

Expansion clamp
Double acting 7 MPa

CGU

CGU
Eccentric

Expansion clamp

model

model

66

CGU

7MPa

DoubleactingCGU- F2□□□

Expansion clamp Eccentric

Doubleacting

7MPa

Specifications
Size

1− ：Air blow model2

E ： Non-constant

Grip inner diameter：Number of grippers

07

08： 4 Gripper

09

10： 2 Gripper

11

12

CGU ー F2

air blow model： 3 Gripper

13

indicates made to order.

CGU-F2107

Grip inner diameter08

4 Grippers

Number of grippers

CGU-F22E
09

10

11

2 Grippers

kN

1.57

2.76

kN

5.34

9.30

Taper rod stroke

mm

4.8

Clamp stroke

mm

1.2

cm

1.5

cm

3

Unclamp

2.3

2.6
3.5

Allowable eccentricity 1

mm

±0.4

Recommended air blow pressure

MPa

0.3

Recommended sensor air pressure

MPa

0.2

kg

0.88

Mass
Recommended tightening torqueof mounting screws 2

CGU
Eccentric

Clamp
Cylinder capacity

13

3 Grippers

Clamping force(hydraulic pressure 7MPa)
Radial expansion force(hydraulic pressure 7MPa)

3

12Expansion clamp

Size
Model

7

N･m

Aluminum, steel and others (HRC30 or below) Cast iron also usable depending on conditions

Workpiece material
Allowable min. grip inner diameter

mm

6.7

7.7

8.7

9.7

10.7

11.7

12.7

Allowable max. grip inner diameter

mm

7.7

8.7

9.7

10.7

11.7

12.7

13.7

Grip inner diameter tapering angle (Draft angle)

3°below

Grip inner diameter circularity

0.1 below● Pressure range：1.5‒7 MPa● Proof pressure：10.5 MPa● Operating temperature：0‒70 ℃● Fluid used：General mineral based hydraulic oil (ISO-VG32 equivalent)● Please inquire if above terms are not applied.
1：By the eccentric mechanism, the expansion clamp does not have a workpiece positioning function.

2：ISO R898 class 12.9

Clamping force & hydraulic pressure
3

Clamping force (kN)

Hydraulic pressure
CGU-F22 E
2

CGU-F21-

1.5

2

3

4

5

6

7

CGU-F21- Clamping force
F=0.224×P

kN 0.34 0.45 0.67 0.90 1.12 1.34 1.57

CGU-F22E Clamping force
F=0.394×P

kN 0.59 0.79 1.18 1.58 1.97 2.36 2.76

P：Hydraulic pressure (MPa)

1

0
1.5

MPa

2

3

4

5

6

7

Hydraulic pressure (MPa)To download CAD data / To get updated information, visit www.pascaleng.co.jp

67

CGU- F2□□□

Air blow model
model

CGU-F21-

Expansion clamp Eccentric

7MPa

Non-constant air blow model
model

DoubleactingNon-constant air blow model

CGU-F22E

model

CGU-F22E

4 Grippers

2 Grippers

3 Grippers

ø7 8

ø9 10

ø11 12 13

PAT.

CGU
Eccentric

Expansion clamp

Air blow ：OUT
Sensor air ：Exh.
(Air blow model)

Sensor air：IN
Incomplete clamping detection

Unclamping
hydraulicpressure

Clamping
hydraulicpressure

Air blow ：IN
Sensor air ：Exh.
(Non-constant air blow model)

Linear length
18 mmOuter diameter
CGU-F21 - 07 : 20mm
CGU-F21 - 08 : 20mm
CGU-F22E09 : 20mm
CGU-F22E10 : 21mm
CGU-F22E11 : 22mm
CGU-F22E12 : 23mm
CGU-F22E13 : 24mm

Expansion clamp
model CGU

Spacer can adjust the height68

Space-saving clamping

CGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingWorkpiece setting (Unclamping completion)① Taper rod and gripper are raised by pistons Ⓐ, Ⓑ and sleeve.
② Set the workpiece onto the seating surface.

Taper rod
Piston Ⓐ

Seating surface
Air blow model：Exhaust

Workpiece
Gripper

Sensor air

SleeveUnclamping completion
Piston Ⓐ opens air ﬂow channel
to exhaust air and the sensor
does not work.

Piston Ⓑ
Clamp condition

Air sensor signal

Unclamping
completion

Air sensor OFF(Sensor air flows.)

Hydraulic pressure
switchExpansion clamp

Piston Ⓐ

Unclamping
hydraulic ON
pressure

Sensor air
Non-constant air blow model：Exhaust(Air blow circuit)

CGU
Eccentric

Unclamping
hydraulic pressure

Workpiece holding (Clamping completion)① Piston Ⓑ and taper rod lower with piston Ⓐ being held at upper stroke end position by clamping hydraulicpressure.
② The gripper expands horizontally along the tapered surface to grip inner face of clamping hole holding
its position at upper stroke end by piston Ⓐ and sleeve.
③ The gripper securely grips the inner face of clamping hole and pulls the workpiece down firmly onto theseating surface.
④ Workpiece holding is completed by the sensor air, clamping and unclamping hydraulic pressure.
Clamping hole

Taper rod

Tapered surface

Seating surface

Piston Ⓐ

Workpiece

Air blow model：Exhaust

Gripper
Sensor air

SleeveClamping completion
Piston Ⓐ

Piston Ⓐ opens air ﬂow channel
to exhaust air and the sensor
does not work.

Piston Ⓑ

Clamp condition

Air sensor signal

Clamping
completion

Air sensor OFF(Sensor air flows.)

Hydraulic pressure
switchClamping
hydraulicpressureON

Sensor air
Clamping
hydraulicpressure

Non-constant air blow model：Exhaust(Air blow circuit)

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

69CGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingLarge gripper expansion stroke
The gripper expands horizontally 1.0mm, which enables the accommodation of dimensional variations in diecast
bore diameters and ensures workpiece is held securely.

Grip inner diameterø10

Taper rod diameter
ø9.55

Min. grip inner diameterø9.7

Max. grip inner diameterø10.7

Draft angle of grip inner diametermax. 3°each side

CGU
Eccentric

Expansion clamp

Example：model CGU-F22E10

Taper rod and gripper with superior durability① The holding force of expansion clamp is transmitted from tapered surface to gripper, making it possible for the gripper
to hold onto inner face of clamping hole and hold the workpiece on the seating surface for secure workpiece clamping.
② Special steel with superior abrasion resistance is used for gripper to improve durability.
③ Tip section of taper rod has larger diameter than gripper and is well
chamfered to be a better guide when setting the workpiece.
Clamping hole
① Tapered surface③ Taper rod tip section② Gripper

Gripper

Seating surface can be reground (Max. 0.1 mm)① When seating surface is damaged, the flange section can be dismounted and reground.
② Flange can be easily dismounted and reassembled at production site.

① Seating surface② Flange70CGU- F2□□□

Expansion clamp Eccentric

Doubleacting

7MPa

Clamping hole pitch errors can be tolerated

Taper rod and gripper slide radially and tolerate pitch
errors (±0.8 mm).
Taper rod and gripper are pushed back towards thecenter by scraper when unclamping.

Allowable eccentricity±0.4 mmTaper rod

Clamping hole

Allowable eccentricity±0.4 mm

Gripper

Sliding

CGU
Eccentric

Expansion clamp

Scraper

By the eccentric mechanism, the expansion clamp does not have a workpiece positioning function.

Incorporating strong air blowing circuit
Air blow from a gap between the gripper and scraper clears off metal chips and coolant that stay on the seating
surface. Flushing channel is also provided on the seating surface to remove the metal chips and coolants smoothly
during workpiece setting.

GripperFlushingchannelScraper

Scraper

Seatingsurface

Unclamping hydraulic pressure

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

Air blow71

CGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingDetects clamping hole diameter that is too large
When the inner diameter of clamping hole exceeds tolerance value, then gripper will fail to gain grip on workpieceeven when extended to maximum reach. Piston Ⓐ lowers until end of stroke as it is pushed down by piston Ⓑ andblocks sensor air, which triggers air sensor and detects incomplete clamping.

Large clamping hole diameter
Maximum gripper expansion diameter

Gripper

CGU
Eccentric

Expansion clamp

Seating surface

Taper rod

Piston Ⓑ

Gripper

Piston Ⓐ

Sensor air

SleeveIncomplete clamping

Piston Ⓐ

Piston Ⓐ lowers until end of
stroke and blocks air, allowing
sensor to detect the pressure.

Piston Ⓑ

Clamping
hydraulic pressure

Sensor air

Clamp condition

Air sensor signal

Hydraulic pressure switch

Incomplete
clamping

Air sensor ON

Unclamping
hydraulic pressure

72(Sensor air does not flow.)

Clamping
hydraulicpressureONCGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingDetects deformation of workpiece and floating of workpiece
When workpiece has significant deformation or when it is set poorly with gap of 1.2 mm above seating surface,then even when the gripper lowers until end of stroke, the workpiece is not held on seating surface. At this time,
piston Ⓐ lowers until end of stroke as it is pushed down by sleeve and blocks sensor air, which triggers air sensor
and detects incomplete clamping.

Taper rod

Incomplete clamping
Piston Ⓐ lowers until end of
stroke and blocks air, allowing
sensor to detect the pressure.

Gripper

Faulty settingof workpiece
Seating surface

SleeveWorkpiece set ﬂoating
1.2 mm and over above
seating surface

Piston Ⓐ

Clamping
hydraulicpressure

Air sensor signal

Incomplete
clamping(Sensor air does not flow.)Sensor air

Air sensor ON

Hydraulic pressure
switchClamping
hydraulicpressureON
CGU
Eccentric

Unclamping
hydraulicpressure

Clamp condition

Expansion clamp

Piston Ⓑ

Detects incomplete gripping
When the inner diameter of clamping hole is slightly larger than allowable value, or when the draft angle of grip
inner diameter is large and results in incomplete gripping by the gripper, piston Ⓐ lowers until end of stroke as
sleeve pushes it down and sensor air is blocked, which triggers air sensor and detects incomplete clamping.

Taper rod

Incomplete clamping
Piston Ⓐ lowers until end of
stroke and blocks air, allowing
sensor to detect the pressure.

Gripper

Large draft angleof grip inner diameter

SleeveSlipping of gripper

Piston Ⓐ

Piston Ⓑ

Unclamping
hydraulicpressure

Clamping
hydraulicpressure

Sensor air

Clamp condition

Air sensor signal

Incomplete
clamping

Air sensor ON(Sensor air does not flow.)

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

Hydraulic pressure
switchClamping
hydraulicpressureON

73

CGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingWith the development of the non-constant air blow expansion clamp, air consumption will be significantly decreased.
The traditional model ordinarily requires 50L/min (0.3MPa) flow rate (when grip inner diameter is ø12). The new model can reduce

Air blow model

Number of grippers

ø7

Clamping force

1.57 kN

8(Hydraulic pressure 7 MPa)

Model

CGU-F21- Grip inner diameter

Expansion clamp

4 Grippers

Grip inner diameter

CGU
Eccentric

Non-constant air blow model

Number of grippers

2 Grippers

Number of grippers

3 Grippers

74

Grip inner diameterø92.76 kN

10(Hydraulic pressure 7 MPa)

Grip inner diameter

ø 11

12

Clamping force

13

Clamping force

2.76 kN(Hydraulic pressure 7 MPa)

Model

CGU-F22E Grip inner diameter

Model

CGU-F22E Grip inner diameterCGU- F2□□□

Expansion clamp Eccentric

7MPa

Doubleactingair consumption and help promote energy conservation. However air blow at time of workpiece replacement is a must.

Space where metal chips can intrude is created

GripperSpace
ScraperA

B

A

Pages →76, 77

Rod
4 Grippers

ScraperB

When clamping

B-B

A-A

Expansion clamp

Rod

Because of space between scraper, gripper and the rod, air blow must always be performed to prevent intrusion of chips.

CGU
Eccentric

Secure chip protection

B

GripperRod

Scraper

ScraperPages →78, 79
AARod
2 Grippers
B

Scraper

A-A

When clamping

B-B

Because there is no space between scraper, gripper and the rod, it is not necessary to perform air blow during cutting process.

Rod

Scraper

Gripper

B
A

Scraper

B

Pages →80, 81

ARod
3 Grippers
Scraper
When clamping

A-A

B-B

Because there is no space between scraper, gripper and the rod, it is not necessary to perform air blow during cutting process.

To download CAD data / To get updated information, visit www.pascaleng.co.jp75

CGU- F21- □Expansion clamp Eccentric

Air blow model

7MPa

DoubleactingDimensions
13

4-ø5.5
Spot facing ø9.5

Seating surface
outer diameter øU

21

A

60°

39

A

49.6

Seating surface
inner diameter øT

ø6

0

A-A
14.2

Details
Rod outer diameter
Gripper outer diameter
øR

AE

F2
(55)

43.5

2

F1

75 ±0.01

CGU
Eccentric

M

30°

10°

0

øS -0.1

18

Expansion clamp
Air blow modeløAD5 (5°tapering)

4

Grip inner diameter usage requirements

Min. F2

19
Min. F1+0.5

Positioning pin
ø3×8

4-O-ring P5

Blind hole

Clamping hydraulic port

Through holeSensor air supply port

12

mm

08

F1

8

9

F2

4

5

M

83

84

øR

6.5

7.5

øS

20

20

øT

10.6

11.6

● Mounting screws are not included.

øU

18

18

● Material used for O-ring is fluorocarbon (Hardness Hs90).

ø AD

4.8

5.8

AE

R0.6

R1

12

07

Unclamping
hydraulic port

21.5
19

25

Blow air supply port

● Seating surface hardness is HRC55.
● The above diagram indicates unclamped condition.

76

Model

CGU-F21-□● CGU-F21-07, 08 are made to order.

Expansion clamp Eccentric

Air blow model

7MPa

DoubleactingMounting details

13

21

Blow air supply port
4-Max.ø3

Unclamping hydraulic port

12

Sensor air supply port

1239

Clamping hydraulic port

(Positioning pin hole)

21.5
19

4-M5

25

● The mounting surface finish must be no rougher than Rz6.3 (ISO4287:1997).

Expansion clamp
Air blow model+0.014
ø3 H8 0 depth 5

CGU
Eccentric

CGU- F21- □To download CAD data / To get updated information, visit www.pascaleng.co.jp

77CGU- F22E□

Expansion clamp Eccentric

Non-constant air blow model

7MPa

DoubleactingDimensions
4-ø5.5
Spot facing ø9.5

13

Seating surface
outer diameter øU

21

A

60°

39

A

49.6

Seating surface
inner diameter øT

ø6

0

A-A
B

Details

øAD
R1

9

10°

0

Gripper outer diameterøF3

75 ±0.01

5 (5°tapering)
43.5

(55)

84

2

5

øS -0.1

18

30°

CGU
Eccentric

Expansion clamp
Non-constant air blow model

Rod outer diameterøF4

4

Grip inner diameter usage requirements

Min. 519
4-O-ring P5
Min. 9.5

Positioning pin
ø3×8

Blind hole

Clamping hydraulic port

Through holeSensor air supply port

Model

09

10

B

14.2

14.9

ø F3

8.5

9.5

ø F4

8.55

9.55

øS

20

21

øT

12.6

13.6

øU

18

19

ø AD

6.8

7.8

12

12

mm

CGU-F22E□

Unclamping
hydraulic port

21.5
19

25

Blow air supply port
(Sensor air exhaust port)● Mounting screws are not included.
● Material used for O-ring is fluorocarbon (Hardness Hs90).
● Seating surface hardness is HRC55.
● The above diagram indicates unclamped condition.

78● CGU-F22E09, 10 are made to order.

Expansion clamp Eccentric

Non-constant air blow model

7MPa

DoubleactingMounting details

13

Blow air supply port
(Sensor air exhaust port)

21

4-Max.ø3
Unclamping hydraulic port

12

Sensor air supply port

1239

Clamping hydraulic port

(Positioning pin hole)

21.5
19

4-M5

25

● The mounting surface finish must be no rougher than Rz6.3 (ISO4287:1997).

Expansion clamp
Non-constant air blow model+0.014
ø3 H8 0 depth 5

CGU
Eccentric

CGU- F22E□

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

79CGU- F22E□

Expansion clamp Eccentric

Non-constant air blow model

Doubleacting7MPaDimensions
4-ø5.5
Spot facing ø9.5

13

Seating surface
outer diameter øU

21

Seating surface
inner diameter øT

a

60°

39

49.6

a

øA
a-a

B

DetailsøAD
R1

Gripper outer diameter
øF3

2

5.6

10

75 ±0.01

5 (5°tapering)
43.5

(55)

85

10°

0

øS -0.1

18

30°

CGU
Eccentric

Expansion clamp
Non-constant air blow model

Rod outer diameterøF4

4

Grip inner diameter usage requirements

4-O-ring P5

Min. 5.6

19
Min. 10.5

Positioning pin
ø3×8

Blind hole

Clamping hydraulic port

Through holeSensor air supply port

12

mm
Model

12

13

øA

60

62

62

B

15.6

16.3

17

ø F3

10.5

11.5

12.5

ø F4

10.55

11.55

12.55

øS

22

23

24

øT

14.6

15.6

16.6

● Material used for O-ring is fluorocarbon (Hardness Hs90).

øU

20

21

22

● Seating surface hardness is HRC55.

ø AD

8.2

9.2

10.2

12

11

Unclamping
hydraulic port

21.5
19

25

Blow air supply port
(Sensor air exhaust port)● Mounting screws are not included.

● The above diagram indicates unclamped condition.

80

CGU-F22E□● CGU-F22E11, 12, 13 are made to order.

Expansion clamp Eccentric

Non-constant air blow model

7MPa

DoubleactingMounting details

13

Blow air supply port
(Sensor air exhaust port)

21

4-Max.ø3
Unclamping hydraulic port

12

Sensor air supply port

1239

Clamping hydraulic port

(Positioning pin hole)

21.5
19

4-M5

25

● The mounting surface finish must be no rougher than Rz6.3 (ISO4287:1997).

Expansion clamp
Non-constant air blow model+0.014
ø3 H8 0 depth 5

CGU
Eccentric

CGU- F22E□

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

81CGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingGripper set replacement

Number of grippers

Gripper set model

Clamp model

CGU-F21-J07

CGU-F21-07

Set description

Scraper × 1

4 Grippers
CGU-F21-J08

Gripper(Refer to table left)

CGU-F21-08
O-ring × 1

CGU-F22EJ09

CGU-F22E09

CGU-F22EJ10

CGU-F22E10

CGU-F22EJ11

CGU-F22E11

Expansion clamp

2 Grippers

It is recommended that grippers, scraper andO-ring be replaced after about 200,000 oper3 Grippers

CGU-F22EJ12CGU-F22E12

ations. Replace grippers in sets and not just an
individual gripper. (Refer to the table on theleft for the gripper set model.)CGU-F22E13

CGU
Eccentric

CGU-F22EJ13

Grip inner diameter & rod height when clamping

Rod height10

Rod height (mm)

9

ø1 1

8

‒ø1

3

ø8‒

ø10

7

Rod height calculation formula
ø7

6

5
-0.3

-0.2

Allowable min.
grip inner diameter

-0.1

0

0.1

Nominalgrip inner diameter

0.2

0.3

0.4

0.5

0.6

Allowable max.
grip inner diameterDiﬀerence between actual grip inner diameterand nominal grip diameter (mm)
82

0.7

ø7

grip inner diameter and：6.82-2.35× Actual
nominal grip diameter difference

ø8grip inner diameter and‒ ø10：7.82-2.35× Actual
nominal grip diameter difference

grip inner diameter andø11 ‒ ø13：8.82-2.35× Actual
nominal grip diameter difference

Example：When CGU-F22E10 (Nominal grip diameter : ø10)is clamping ø9.8 hole
Rod height = 7.82 - 2.35×(-0.2) = 8.29mm

CGU- F2□□□

Expansion clamp Eccentric

Doubleacting

7MPa

System configuration example

Expansion clamp

Workpiece positioning pin（Round）2

model CGU

Workpiece
guide 1

Workpiece guide

Expansion clamp
model CGU

1Expansion clamp

Workpiece positioning pin（Diamond）2model CGU

Workpiece guide1

Grip inner diameter D
CGU
Eccentric

Workpiece positioning pin（Round）2

Expansion clamp

model CGU

10mm and overExpansion clamp

Rod outer diameter d

Diametral space
D-d and underSpacerWorkpiece positioning pin（Diamond）2Expansion clamp
model CGU

1: When using automatic or robotic conveyers, prevent damage to clamp caused from
impact by setting workpiece guides. Using the above guide as reference, accurately
position the holes when using workpiece guides.
2: The expansion clamp does not have a workpiece positioning function.
Install workpiece positioning pins (or similar).

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

83CGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingAir blow model hydraulic and pneumatic circuit diagramⒹ Flow control valve②●①●

P.S. 1

Clamping
hydraulic pressure

0.3MPa(Recommended
air pressure)

5μm

Air blow
0.1MPa(Recommended
air pressure)

P.S. 2Ⓒ

Air sensor unit

(The circuit diagram is subject to change according to the model of sensor.)

5μm
Unclamping
hydraulic pressureⒷ Flow control valve

Expansion clamp(Meter-out control)

Sensor air
0.2MPa(Recommended air pressure)● Be sure to air blow upon loading and unloading workpiece and when clamping and unclamping. During cutting,
if chips adhere to the gripper such as when going through the clamping hole, continue air blowing during
processing as well.

CGU
Eccentric● Air blow pressure must be set to 0.1MPa when checking the operation of the clamp with the air sensor.

Air blowing

Clamping

Air blowSensor air
ExhaustAir blowSensor air
ExhaustClamping
hydraulic pressure

Air blow

Unclamping
hydraulicpressure

84

Sensor air

Air blow

Unclamping
hydraulicpressure

Sensor air

CGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingNon-constant air blow model hydraulic and pneumatic circuit diagramⒹ Flow control valve②●①●

P.S. 1

Clamping
hydraulic pressureⒶ Solenoid valve

0.3MPa(Recommended air pressure)
5μm

Air blow(

P.S. 2

Exhaustwhen OFFⒸ)

Air sensor unit

(The circuit diagram is subject to change according to the model of sensor.)

5μm
Sensor air(Meter-out control)

0.2MPa(Recommended air pressure)

Expansion clamp

Unclamping
hydraulic pressureⒷ Flow control valve● Air blow will not be necessary during cutting process. Be sure to air blow upon loading and unloading workpiece
and when clamping and unclamping to remove metal chips and debris.
● The solenoid valve Ⓐ must be closed when checking the operation of the clamp with the air sensor. Also 3

CGU
Eccentric

port type of solenoid valve must be used in the circuit. If 2 port type of the valve is used, sensing air cannot be
exhausted and clamp detection function is disabled.

Air blowing

Clamping

Air blow

Clamping
hydraulic pressureⒶ Solenoid valve ofⒶ Solenoid valve of

air blow circuit

air blow circuit

Unclamping
hydraulicpressureON

Unclamping
hydraulicpressure

Sensor air

Air blow

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

OFF
Exhaust(Sensor air)85

CGU- F2□□□

Expansion clamp Eccentric

7MPa

Doubleacting● Operation speed must be adjusted by a meter-out type flow control valve Ⓑ being provided in the unclamping
circuit. By the adjustment, oil flow in unclamping circuit is squeezed and back pressure is generated. The backpressure acts on the piston Ⓐ of the clamp and makes the gripper expand first then the taper rod strokes down
to clamp. If meter-in type flow control valve is installed in the circuit, it dumps the oil rapidly and makes thegripper move very quick which causes incomplete clamping.
● Adjust oil flow when clamping to have the taper rod full stroke in 0.3 sec or over.
Excessive oil flow to the clamp gives impact load and may cause breakage of the parts.
● Provide additional flow control valve Ⓓ to the place of either ① or ② in the circuit diagram to adjust oil flow
when a large discharge volume pump is used for the hydraulic circuit. The flow control valve Ⓑ alone may not
be good enough to adjust the speed of clamp operation.

Clamping hole

Taper rod

Workpiece

Expansion clamp

Gripper
SleevePistonⒶ

CGU
Eccentric

PistonⒷ

Unclamping hydraulic pressure

Clamping hydraulic pressure

Unclamping hydraulic pressure circuitⒷ Flow control valve

Air sensor unit Ⓒ recommended condition of use

ISA3-F/G series
Supplier andmodel

Air supply
pressure86

manufactured by SMC

GPS2-05 , GPS3-E series
manufactured by CKD
0.2 MPa

Inner diameterof pipingø4 mm (ISA3-F：ø2.5 mm)

Overall piping
length5 m or less

● Use a solenoid valve with needle for air sensor
unit Ⓒ and control it supplying air all the time inorder to eliminate intrusion of chips or coolant.
● There is a case that air sensing cannot be madesuccessfully as designed when it is used out of
the usage shown on the left. Contact Technicalservice center for more details.

CGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingOperation cycle
The clamp should be controlled with the cycle in the diagram shown below to detect the operation status exactly.

Case of air blow model
Workpiece

State

Clamping

loading

Air blow

Clamping

switchingcompletion 1(Machining)

Air blowswitching

Unclamping

Unclamping

Workpiece

completion 2

unloading

Workpiece Clamp
clamp
Unclamp0.3MPa4

Air blow
0.1MPaON
Sensor air

OFF

ON

OFF

Unclamping hydraulicpressure P.S. 2

ON

OFF

ON

OFF or ON 3

Air sensor

1 : Clamping completion: P.S. 1＝ON

CGU
Eccentric5

Clamping hydraulicpressure P.S. 1

Expansion clamp

OFF

P.S. 2＝OFF Air sensor＝OFF

2 : Unclamping completion : P.S. 1＝OFF P.S. 2＝ON
3 : OFF : Complete clamping ON : Incomplete clamping
4 : Solenoid valve control

5 : Hydraulic pressure switch, Air sensor signal

Case of non-constant air blow model
Workpiece

State

Clamping

loading

Air blow

ClampingOFF

completion 1(Machining)

Air blowON

Unclamping

Unclamping

Workpiece

completion 2

unloading

Workpiece Clamp
clamp
UnclampON

4

Air blowOFFON
Sensor air
OFF5

Clamping hydraulicpressure P.S. 1

OFF

ON

OFF

Unclamping hydraulicpressure P.S. 2

ON

OFF

ON

OFF or ON 3

Air sensor

1 : Clamping completion: P.S. 1＝ON

P.S. 2＝OFF Air sensor＝OFF

2 : Unclamping completion : P.S. 1＝OFF P.S. 2＝ON
3 : OFF : Complete clamping ON : Incomplete clamping
4 : Solenoid valve control
5 : Hydraulic pressure switch, Air sensor signal

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

87CGU- F2□□□

Expansion clamp Eccentric

7MPa

DoubleactingCaution in use● Be sure to make inner diameter of air blow circuit 4 mm
and over except for clamp mounting surface.

● Perform unclamping completion detection, clamping completion detection and incomplete clamping detection withcombination actions of pressure switch and sensor shownin table below. (Refer to hydraulic and pneumatic circuit● Set the workpiece in such a way that the clamping hole ofdiagram on page →84, 85 for details.)

workpiece is perpendicular to seating surface. Clamping intilted condition results in uneven contact of gripper withhole, which leads to concentration of load that may cause
damage.

● Verify that there are no metal chips or debris on seating
surface of clamping hole and clamp body before setting
workpiece. Allowing intrusion of metal chips results in inse-

Expansion clamp

cure clamping, which can lead to low grade of machining
accuracy.

● Flaring (Biting) of gripper into workpiece varies depending
on workpiece material or thermal processing conditions.

CGU
Eccentric

With regards to conditions of workpiece and clamping hole,refer to page → 67 Secure clamping is not possible when
workpiece or clamping hole that does not satisfy these
conditions is used.

● If clamping hole serves as taper hole (cast draft hole withgradient), then perform test clamping using applicable
workpiece beforehand to verify that there are no problems
with operations.

● Deformation may occur if the thickness of clamping holesection of workpiece is extremely thin. Use applicable
workpiece to perform test clamping beforehand to verify
that there are no deformations in thin portion.

● Supply the dry and filtered air. Particulate size 5μm or lessis recommended.

● Measure seating surface flatness with hydraulic pressure
applied on clamping side, or by applying hydraulic pressure
on neither clamping nor unclamping side.

88

Applications

Pressureswitch 1(P.S. 1)Pressureswitch 2(P.S. 2)Air sensor

Unclamping
completion detection

OFF

ON

ー

Clamping
completion detection

ON

OFF

OFF

Incomplete
clamping detection

ON

OFF

ON