CGC- N2□ E□

Expansion clamp

Expansion clamp

Expansion clamp
Double acting 7 MPa

CGC

CGC

model

model

14

CGC

7MPa

DoubleactingCGC- N2□ E□

Expansion clamp

Doubleacting

7MPa

Specifications
Grip inner diameter

1

2

CGC ー N2

E

：Number of grippers

070

073

076

085

09

10

：2 Grippers

11

12

13

：3 Grippers

12

13

14

3

079

082 ：2 Grippers

15

16

Expansion clamp

Size：3 Grippers

CGC-N21E 1

Size
Model
Grip inner diameter

070

073

076

CGC-N22E

079

082

085

09

10

11

12

13

12

kN 1.92 2

2.24

3.04

kN 6.7 2

7.8

9.5 2

Taper rod stroke

mm

4.8

Clamp stroke

mm

1.2

Clamp
UnclampAllowable eccentricity

3

Recommended air blowpressure
Recommended sensor airpressure

13

14

2

3.54

7.50

11.1

23.4

cm

3

1.7

2.7

5.8

cm

3

2.3

3.5

7.2

mm

±0.5

MPa

0.3

MPa

0.2

kg

0.38

0.50

0.83

Recommended tightening N･mtorque of mounting screws 4

3.5

7

12

Mass

15

16

3 Grippers

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

Cylindercapacity

CGC-N23E

2 Grippers

Number of grippers

CGC

indicates made to order.

Workpiece material

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

Allowable min.
mm
grip inner diameter
Allowable max.
mm
grip inner diameter
Grip inner diameter tapering
angle (Draft angle)

6.7

7.0

7.3

7.6

7.9

8.2

8.7

7.4

7.7

8.0

8.3

8.6

9.2

9.7 10.7 11.7 12.7 13.7 12.7 13.7 14.7 15.7 16.7

9.7 10.7 11.7 12.7 11.7 12.7 13.7 14.7 15.7

3°or below
0.1 or below

Grip inner diameter circularity● Pressure range：1.5‒7 MPa (CGC-N21E070, CGC-N22E085：1.5‒6 MPa）
● Operating temperature：0‒70 ℃● Proof pressure：10.5 MPa（CGC-N21E070, CGC-N22E085：9 MPa）

● Fluid used：General mineral based hydraulic oil (ISO-VG32 equivalent)● Please inquire if above terms are not applied.
1：CGC-N21E070, 073, 076, 079, 082 are not built-in unclamping sensor valve.

2：Capacity values for hydraulic pressure of 6 MPa are shown.

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

4：ISO R898 class 12.9

Clamping force & hydraulic pressure
8

Hydraulic pressure

Clamping force (kN)MPa

CGC-N23E

7

CGC-N21E Clamping force

6

F=0.320×P

1.5

2

3

4

5

6

7

kN 0.48 0.64 0.96 1.28 1.60 1.92 2.24

5

CGC-N22E Clamping force

4

F=0.506×P

CGC-N22E

kN 0.76 1.01 1.52 2.02 2.53 3.04 3.54

3

CGC-N23E Clamping force

2
1
0
1.5

F=1.072×P

CGC-N21E

2

3

4

5

Hydraulic pressure (MPa)67kN 1.61 2.14 3.22 4.29 5.36 6.43 7.50

P：Hydraulic pressure (MPa)● CGC-N21E070, CGC-N22E085 applicable hydraulic pressure shouldbe 1.5 to 6 MPa.

To download CAD data / To get updated information, visit www.pascaleng.co.jp15CGC- N2□ E□

model

CGC-N21E

Expansion clamp

model

7MPa

CGC-N22E

model

Doubleacting

CGC-N23E

2 Grippers

3 Grippers

3 Grippers

ø7.0 7.3 7.6 7.9 8.2

ø8.5 9 10

ø11 12 13

ø12 13 14 15 16

CGC

Expansion clamp

2 Grippers

Sensor nozzle：Exh.
(Workpiece seating detection)❸❶ Piston Ⓐ❻

Unclamping sensor valve ❹❷ Incomplete clamping
sensor valve❻❺
Sensor air：IN

Air blow：IN
Unclamping detection ：Exh.
Incomplete clamping detection：Exh.

Workpiece seating detection
Unclamping detection
Incomplete clamping detectionⓐ❶ Gripper support mechanism (PAT.)The gripping force can be maintained by the hydraulic power (Cylinderⓐ) so that the gripper can firmly catch the workpiece without slipping.
When unclamping, the hydraulic power (Cylinder ⓑ) support thegripper.

❷ Incomplete clamping sensor valve (PAT.)
Incomplete clamping can be detected by an air sensor and the clamped
condition can positively be confirmed. Refer to page →21.

❸ Most effective scraping structure to prevent theclamp from metal chips (PAT.)No chips can intrude because the scraper fits around the gripper andthe rod without space. Refer to pages →24, 25.
Model CGC does not need air-blow during cutting process and it
prevents work environment from air contamination by air-blow mist
also lessens air consumption.
The durability of scraper has been improved because it deforms
radially and evenly along with the stroke of the gripper.

16ⓑ❹ Unclamping sensor valve (JP PAT.)The valve enables positive unclamping detection by movement ofpiston when model CGC is in unclamping action. Refer to page →22.

❺ Using one circuit for air blow and sensor exhaust (JP PAT.)
Sharing exhaust circuit of the unclamping sensor valve and theincomplete clamping sensor valve with an air blow circuit allows to
reduce the number of the circuits and thereby enables the circuitdesign to be easy.

❻ Stroke end detection by a piston Ⓐ (JP PAT.)The gripper does not impair the scraper because it expands horizontallyfirst then strokes down for clamping.
No tolerance is required on depth of the bore when machining it
because the piston ends its stroke by an internal part, not at thebottom of the bore.

CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingWorkpiece setting① Taper rod and gripper are raised by pistons Ⓐ, Ⓑ and sleeve. The gripper is drawn inward within the taper
rod diameter.
Expansion clamp② Set the workpiece onto the seating surface.

Taper rod

Workpiece

CGC

Gripper

Seating surface

SleevePiston Ⓐ

Piston Ⓑ

Clamping
hydraulic pressure

Unclamping
hydraulic pressure

Workpiece holding① 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.
Clamping hole

Tapered surface

Workpiece

Taper rod

Gripper

Seating surface

SleevePiston Ⓐ

Piston Ⓑ

Clamping
hydraulic pressure

Unclamping
hydraulic pressure

To download CAD data / To get updated information, visit www.pascaleng.co.jp17CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingLarge gripper expansion stroke
The gripper expands horizontally 1.0mm( ), which enables the accommodation of dimensional variations in diecast

CGC

Expansion clamp

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

Example：model CGC-N22E10：0.7mm stroke for CGC-N21E070, 073, 076, 079, 082

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 section

Gripper② 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 Flange18

CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingClamping hole pitch errors can be tolerated

Taper rod and gripper slide radially and tolerate pitch
Expansion clamp

errors (±1mm).
Taper rod and gripper are pushed back towards thecenter by scraper when unclamping.

Allowable eccentricity ±0.5mm

Taper rod

Clamping hole

Allowable eccentricity ±0.5mm

CGC

Gripper
Sliding
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

Air blow

Unclamping
hydraulic pressure

To download CAD data / To get updated information, visit www.pascaleng.co.jp19CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingSensor nozzle detects faulty seating of workpiece

1.2mm and over above the seating surface due to its distortion, the workpiece cannot sit fully on the surface andair is exhausted from the sensor nozzle. Incomplete workpiece seating is detected.

Metal chips caught
by clamp

Faulty setting ofworkpiece

CGC

Expansion clamp

If clamping operation is made when metal chips are under the workpiece (Figure 1-a), or when the workpiece is set

Seating surface
Metal chip

Workpiece set
ﬂoating1.2 mm
and over above
seating surface

Sensor nozzle

Sensor nozzle

Figure 1-a

Figure 1-b

Faulty seating of workpiece

Seating completion of workpiece

Sensor air is exhausted from sensor nozzle.
Air sensor is not triggered and faulty
seating of workpiece is detected.

Sensor nozzle is blocked by the workpiece.
Air sensor detects the seating completionof workpiece.

Sensor nozzle

Sensor nozzle

ExhaustClamping
hydraulicpressure

Clamping
hydraulicpressure

Unclamping
hydraulic pressure

20

Unclamping
hydraulic pressure

Sensor air

Clamp condition

Sensor nozzle

Faulty seating ofworkpiece

Open

Air sensor signal

Air sensor OFF(Sensor air flows.)

Hydraulic pressure switch
Clamping
hydraulicpressureON

Sensor air

CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingIncomplete clamping sensor valve detects incomplete clamping
PAT. JP4297511
US8246029
EP2253419

When gripper fails to grip properly due to large draft angle of grip inner diameter (Figure 2-a), incomplete clamping
Expansion clamp

sensor valve is opened. Sensor air is exhausted and this detects incomplete clamping.
When clamping hole exceeds tolerance value (Figure 2-b), or when gripper is broken (Figure 2-c), incomplete clamping
is detected as well.
Clamping hole is large(Full stroke)If gripper is broken

FullstrokeFullstrokeSlipping ofgripper

Figure 2-a

Figure 2-b

Figure 2-c

Incomplete clamping

Clamping completion

Incomplete clamping sensor valve is opened
by piston Ⓐ, sensor air is exhausted. Air
sensor is not triggered and this detects
incomplete clamping.

Incomplete clamping sensor valve remains
closed. Air sensor detects normal clamping
completion.

Incomplete clamping
sensor valve

Incomplete clamping
sensor valve
Piston Ⓐ

Piston Ⓐ

Clamping
hydraulicpressure

Exhaust(Air blow circuit)

CGC

Large draft angle ofgrip inner diameter

Clamping
hydraulicpressure

Unclamping
hydraulic pressure

Sensor air

Clamp condition

Incomplete clamping
sensor valve

Incomplete
clamping

Open

Unclamping
hydraulic pressure

Air sensor signal

Air sensor OFF(Sensor air flows.)

Sensor air

Hydraulic pressure switch
Clamping
hydraulicpressureON

To download CAD data / To get updated information, visit www.pascaleng.co.jp21CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingUnclamping sensor valve detects unclamping operation is complete

CGC

Expansion clamp

Unclamping sensor valve enables sensor to detect unclamping completion. The valve opens to exhaust sensor air evenwhen the workpiece blocks the sensor nozzle.

Unclamping sensor valve will not equipped with the following models.
CGC-N21E070 / 073 / 076 / 079 / 082

Unclamping completion

Clamping completion

Unclamping sensor valve is opened by pistonⒷ and sensor air is exhausted. Air sensor is not
triggered and this detects unclamping
completion.

Unclamping sensor valve is closed byclamping hydraulic pressure. Air sensor
detects normal clamping completion.

Sensor nozzle

Unclamping
sensor valve

Unclamping
sensor valve

Clamping
hydraulicpressure

Piston Ⓑ

Exhaust(Air blow circuit)

22

Unclamping
hydraulic pressure

Unclamping
hydraulic pressure

Sensor air

Clamp condition

Unclamping sensor valve

Air sensor signal

Unclamping
completionOpen

Air sensor OFF

Clamping
completion

Close

Air sensor ON(Sensor air flows.)(Sensor air does not flow.)

Hydraulic pressure switch
Unclamping
hydraulic ON
pressure
Clamping
hydraulicpressureON

Sensor air

CGC- N2□ E□

Expansion clamp

7MPa

Unclamping completion

DoubleactingClamping completion

Unclamping
sensor valve

CGC

Unclamping
sensor valve

Expansion clamp

Sensor nozzle

Clamping
hydraulicpressure

Piston Ⓑ

Exhaust(Air blow circuit)

Unclamping
hydraulic pressure

Unclamping
hydraulic pressure

Sensor air

Clamp condition

Sensor nozzle

Incomplete
clamping
sensor valve

Unclamping
sensor valve

Unclamping
completion

Close

Close

Open

Clamping
completion

Close

Close

Close

Sensor air

Air sensor signal

Hydraulic pressure switch

Air sensor OFF

Unclamping
hydraulic ON
pressure(Sensor air flows.)

Clamping
hydraulicpressure

Air sensor ON(Sensor air does not flow.)

Faulty seating of workpieceON

Incomplete clamping

Sensor nozzle

ExhaustIncomplete clamping
sensor valve
Piston Ⓐ

Clamping
hydraulicpressure

Clamping
hydraulicpressure

Unclamping
hydraulic pressure

Exhaust(Air blow circuit)Sensor air

Unclamping
hydraulic pressure

Clamp condition

Sensor nozzle

Incomplete
clamping
sensor valve

Unclamping
sensor valve

Faulty seating ofworkpiece

Open

Close

Close

Air sensor OFF

Incomplete
clamping

Close

Open

Close

Air sensor OFF

Air sensor signal(Sensor air flows.)(Sensor air flows.)

Sensor air

Hydraulic pressure switch
Clamping
hydraulicpressureON

Clamping
hydraulicpressureON

To download CAD data / To get updated information, visit www.pascaleng.co.jp23CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingNon-constant air blow model considerably reduces air consumption

Expansion clamp

PAT. JP5674191
US8800982
EP2543468

The newly developed non-constant air blow model has no open

2 Grippers, 3 Grippers

space between a scraper, a gripper and a rod thereby no air blow

Non-constant air blow model

during machining is required to prevent chips intrusion.

Open space where metal
chips can intrude is removed
during clamping.

The air blow model (See picture on the right), which requires constant air blow during machining, used to consume constantly 50 L/
min (0.3MPa) of air for 12mm of grip inner diameter, however, the4 Grippers (Old model)

CGC

new model requires air blow only when the clamp is in clamp andAir blow model

unclamp action, and when workpiece replacement.

Open space where metal
chips can intrude is createdduring clamping.

This enables significant reduction of air consumption, which helps
promote energy conservation.

Non-constant air blow model

Number of grippers

Grip inner diameter

Clamping force

ø 7.0(Hydraulic pressure 6MPa)

ø 7.3

7.6

1.92 kN

7.9

8.2

2 Grippers

Number of grippers(Hydraulic pressure 7MPa)3.54 kN

10

12

CGC-N21E Grip inner diameter(Hydraulic pressure 6MPa)

CGC-N22E Grip inner diameter(Hydraulic pressure 7MPa)

Grip inner diameterø 11

2.24 kN
3.04 kN

ø 8.5
ø9

Model

13

Clamping force

3.54 kN(Hydraulic pressure 7MPa)

Model

CGC-N22E Grip inner diameter3 Grippers
ø 12 13 14 15 16

7.50 kN(Hydraulic pressure 7MPa)

ø12, ø13 has been available in two different models of the clamping force.

24

CGC-N23E Grip inner diameterCGC- N2□ E□

Expansion clamp

7MPa

DoubleactingSpace where metal chips can intrude is created (Old model)

GripperSpace
ScraperA

Expansion clamp

Rod

B

A
Rod
4 Grippers

Scraper
B

A-A

B-B

CGC

When clamping

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

Secure chip protection

Rod

B

Gripper

Scraper

ScraperPages →26‒29
A

A

Rod
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

GripperA

A

Scraper

B

Scraper

B

Pages →30‒33
Rod
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.jp25CGC- N21E□

Expansion clamp

Non-constant air blow model

7MPa

DoubleactingSeating surface
outer diameter øUE1

Seating surface
inner diameter øT

Sensor nozzle ø1

E2

60°

27

36.6

ø54
A

Expansion clamp
Non-constant air blow model

Dimensions

CGC

A

A-A
34

Details
Rod outer diameter
øF4
øAD
R0.6

30°

8

Gripper outer diameter
øF3

4

°

48
67.5

5 (5°tapering)

5

5.5

30

Clamp removal thread
4-M5×0.8 thread through40±0.005

R5

4-ø8

2

16

0

øS -0.1

19.5

4-ø4.5

Grip inner diameter usage requirements

O-ring AS568-025
Min. 43-O-ring P4

ø33.5-0.025

Min. 8.5

ø34 f 7 -0.050

Blind hole

22.5

Through hole

mm

22

070

CGC-N21E□
073
076
079

082

E1

7.1

7.1

7.3

7.5

7.6

E2

4.7

4.7

4.7

4.7

4.7

ø F3

6.5

6.8

7.1

7.4

7.7

ø F4

6.55

6.85

7.15

7.45

7.75

øS

20.5

20.6

20.9

21.2

21.5

øT

10.6

10.9

11.2

11.5

11.8

● Seating surface hardness is HRC55.

øU

20

20.1

20.4

20.7

21

● The above diagram indicates unclamped condition.

ø AD

5.4

5.7

6

6.3

6.6

Blow air supply port
(Sensor air exhaust port)
5.5 5.5

Clamping hydraulic port

Sensor air supply port

Model

● Mounting screws are not included.
● Material used for O-ring is fluorocarbon (Hardness Hs90).

● CGC-N21E070, 073, 076, 079, 082 are made to order.

26

CGC- N21E□

Expansion clamp

Non-constant air blow model

7MPa

Doubleacting22.5

Clamping hydraulic port

22
Sensor air supply port

27

5.5 5.5

3-Max. ø2.5

Expansion clamp
Non-constant air blow model

Mounting details

ø34 H8+0.039
0

1

Rz6.3
6.3

Rz

Min. 20Rz6.3(H8 range)
Min. 10

4-M4

34

30°

CGC

Blow air supply port
(Sensor air exhaust port)

R0.4
Unclamping hydraulic portside face processing range

(ø3)
ø33.8

+0.2
0

Unclamping hydraulic port

Unclamping hydraulic portbottom face processing range
Rz: ISO4287(1997)：Unclamping hydraulic port must be made on either side or bottom face.

● Apply an appropriate amount of grease to the chamfer and the bore when mounting.
Excessive grease may be a blockage in the air passage, causing malfunction of the sensor.
● The 30°taper machining must be provided to avoid the damage of the O-ring.

To download CAD data / To get updated information, visit www.pascaleng.co.jp27

CGC- N22E□

Expansion clamp

Non-constant air blow model

7MPa

DoubleactingSeating surface
outer diameter øU
Sensor nozzle ø1

Seating surface
inner diameter øT

60
°

E2

33

43.6

E1

A

Expansion clamp
Non-constant air blow model

Dimensions

ø63

CGC

A

A-A
40

Details
Rod outer diameter
øF4
øAD

R1

30

9
5

Gripper outer diameter
øF3

2

°

Clamp removal thread
4-M6×1 thread through49

R5

4-ø9.568.50

øS -0.1

40±0.005

16

30°

5

4.5

5 (5°tapering)
19.5

4-ø5.5

Grip inner diameter usage requirements

O-ring AS568-029
3-O-ring P5

ø40.5-0.025

Min. 9.5

Min. 5

ø41 f 7 -0.050

Blind hole
26.5
Clamping hydraulic port

Through hole

25.5
Blow air supply port
(Sensor air exhaust port)

mm

085

CGC-N22E□
09

10

E1

8.3

8.3

8.9

E2

4.6

4.6

4.6

ø F3

8

8.5

9.5

ø F4

8.05

8.55

9.55

øS

22.5

22.5

23.5

øT

12.1

12.6

13.6

● Seating surface hardness is HRC55.

øU

22

22

23

● The above diagram indicates unclamped condition.

ø AD

6.3

6.8

7.8

7

7

Model

Sensor air supply port

● Mounting screws are not included.
● Material used for O-ring is fluorocarbon (Hardness Hs90).

● CGC-N22E085 is made to order.

28

CGC- N22E□

Expansion clamp

Non-constant air blow model

7MPa

Doubleacting26.5

25.5

Clamping hydraulic port
Sensor air supply port

7

33

7

3-Max. ø3

Expansion clamp
Non-constant air blow model

Mounting details

CGC

Blow air supply port
(Sensor air exhaust port)
4-M5

ø41 H830°+0.039
0

1

Rz6.3
6.3

Rz

Min. 20Rz6.3(H8 range)
Min. 1040

R0.4
Unclamping hydraulic portside face processing range

(ø3)
ø40.8

+0.2
0

Unclamping hydraulic port

Unclamping hydraulic portbottom face processing range
Rz: ISO4287(1997)：Unclamping hydraulic port must be made on either side or bottom face.

● Apply an appropriate amount of grease to the chamfer and the bore when mounting.
Excessive grease may be a blockage in the air passage, causing malfunction of the sensor.
● The 30°taper machining must be provided to avoid the damage of the O-ring.

To download CAD data / To get updated information, visit www.pascaleng.co.jp29

CGC- N22E□

Expansion clamp

Non-constant air blow model

7MPa

DoubleactingSeating surface
outer diameter øU
Sensor nozzle ø1

Seating surface
inner diameter øT

60
°

E2

33

43.6

E1

A

Expansion clamp
Non-constant air blow model

Dimensions

ø63

CGC

A

A-A
40

Details
Rod outer diameter
øF4
øAD

R1

30

°

Clamp removal thread
4-M6×1 thread throughGripper outer diameter
øF3

5.6
2

50

R5

4-ø9.569.50

øS -0.1

40±0.005

16

10

30°

5

4.5

5 (5°tapering)

19.5

4-ø5.5

Grip inner diameter usage requirements

O-ring AS568-029

Min. 5.6

3-O-ring P5

ø40.5-0.025

Min. 10.5

ø41 f 7 -0.050

Blind hole
26.5
Clamping hydraulic port

Through hole

25.5
Blow air supply port
(Sensor air exhaust port)

mm

11

CGC-N22E□
12

13

E1

9.4

9.9

10.4

E2

4.7

4.8

4.9

ø F3

10.5

11.5

12.5

ø F4

10.55

11.55

12.55

øS

24.5

25.5

26.5

øT

14.6

15.6

16.6

● Seating surface hardness is HRC55.

øU

24

25

26

● The above diagram indicates unclamped condition.

ø AD

8.2

9.2

10.2

7

7

Model

Sensor air supply port

● Mounting screws are not included.
● Material used for O-ring is fluorocarbon (Hardness Hs90).

30

CGC- N22E□

Expansion clamp

Non-constant air blow model

7MPa

Doubleacting26.5

25.5

Clamping hydraulic port
Sensor air supply port

7

33

7

3-Max. ø3

Expansion clamp
Non-constant air blow model

Mounting details

CGC

Blow air supply port
(Sensor air exhaust port)
4-M5

ø41 H830°+0.039
0

1

Rz6.3
6.3

Rz

Min. 20Rz6.3(H8 range)
Min. 1040

R0.4
Unclamping hydraulic portside face processing range

(ø3)
ø40.8

+0.2
0

Unclamping hydraulic port

Unclamping hydraulic portbottom face processing range
Rz: ISO4287(1997)：Unclamping hydraulic port must be made on either side or bottom face.

● Apply an appropriate amount of grease to the chamfer and the bore when mounting.
Excessive grease may be a blockage in the air passage, causing malfunction of the sensor.
● The 30°taper machining must be provided to avoid the damage of the O-ring.

To download CAD data / To get updated information, visit www.pascaleng.co.jp31CGC- N23E□

Expansion clamp

Non-constant air blow model

Doubleacting

7MPa

E1

Seating surface
outer diameter øU

Sensor nozzle ø1

Seating surface
inner diameter øT

E2

60
°

43

A

CGC

55.6

A

Expansion clamp
Non-constant air blow model

Dimensions

ø7

7

A-A
48
74

Details
Rod outer diameter
øF4
R1

øAD

°

2

5 (5°tapering)

5

4.5

30

Clamp removal thread
4-M8×1.25 thread through

50

4-ø11

Gripper outer diameter
øF3

69.5

R5

40±0.0050øS -0.1

5.6

13

10

30°

19.5

4-ø6.8O-ring AS568-032

Grip inner diameter usage requirements
ø52.5

Min. 5.6

3-O-ring P5-0.030Min. 10.5

ø53 f 7 -0.060

32

Blind hole

32

Through hole

Blow air supply port
(Sensor air exhaust port)

Clamping hydraulic port

mm

12

CGC-N23E□
13
14
15

16

E1

10.7

10.7

10.7

11

11.5

E2

6

6

6

6

6.1

ø F3

11.5

12.5

13.5

14.5

15.5

ø F4

11.55

12.55

13.55

14.55

15.55

øS

28

28

28

28.5

29.5

øT

15.6

16.6

17.6

18.6

19.6

● Seating surface hardness is HRC55.

øU

27.5

27.5

27.5

28

29

● The above diagram indicates unclamped condition.

ø AD

9.2

10.2

11.2

12.2

13.2

9

9

Model

Sensor air supply port

● Mounting screws are not included.
● Material used for O-ring is fluorocarbon (Hardness Hs90).

● CGC-N23E12, 13, 14, 15, 16 are made to order.

32

CGC- N23E□

Expansion clamp

Non-constant air blow model

7MPa

Doubleacting32

32

Clamping hydraulic port

Sensor air supply port

9

43

9

3-Max. ø3

Expansion clamp
Non-constant air blow model

Mounting details

CGC

Blow air supply port
(Sensor air exhaust port)
4-M6

ø53 H830°+0.046
0

1

Rz6.3
6.3

Rz

Min. 20Rz6.3(H8 range)
Min. 1048

R0.4
Unclamping hydraulic portside face processing range

(ø3)
ø52.8

+0.2
0

Unclamping hydraulic port

Unclamping hydraulic portbottom face processing range
Rz: ISO4287(1997)：Unclamping hydraulic port must be made on either side or bottom face.

● Apply an appropriate amount of grease to the chamfer and the bore when mounting.
Excessive grease may be a blockage in the air passage, causing malfunction of the sensor.
● The 30°taper machining must be provided to avoid the damage of the O-ring.

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

33

CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingGripper set replacement

Gripper set model

Clamp model

CGC-N21EJ070

CGC-N21E070

CGC-N21EJ073

CGC-N21E073

CGC-N21EJ076

CGC-N21E076

CGC-N21EJ079

CGC-N21E079

CGC-N21EJ082

CGC-N21E082

CGC-N22EJ085

CGC-N22E085

CGC-N22EJ09

CGC-N22E09

CGC-N22EJ10

CGC-N22E10

CGC-N22EJ11

CGC-N22E11

CGC-N22EJ12CGC-N22E12

CGC-N22EJ13

CGC-N22E13

CGC-N23EJ12

CGC-N23E12

CGC-N23EJ13

CGC-N23E13

O-ring be replaced after about 200,000 oper-

CGC-N23EJ14

CGC-N23E14

ations. Replace grippers in sets and not just an

CGC-N23EJ15

CGC-N23E15

CGC-N23EJ16

CGC-N23E16

Expansion clamp

Number of grippers

Set description

Scraper × 1

CGC

2 Grippers

3 Grippers

Gripper(Refer to table left)

O-ring × 1

It is recommended that grippers, scraper andindividual gripper. (Refer to the table on theleft for the gripper set model.)Grip inner diameter & rod height when clamping

Rod height10

Rod height (mm)

9

ø1 1

8

6

ø8.5

‒ø1

7

ø7‒

0

Rod height calculation formula
grip inner diameter andø7 ‒ ø8.2：6.58-2.84× Actual
nominal grip diameter difference

ø8.

6

5
-0.3

‒ø1

-0.2

Allowable min.
grip inner diameter

-0.1

0

0.1

Nominalgrip inner diameter

0.2

2

0.3

grip inner diameter andø8.5 ‒ ø10 ：7.82-2.35× Actual
nominal grip diameter difference

0.4

0.5

ø7‒ø8.2
Allowable max.
grip inner diameter

0.6

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

34

0.7

grip inner diameter andø11 ‒ ø16 ：8.82-2.35× Actual
nominal grip diameter difference

Example：When CGC-N22E10 (Nominal grip diameter : ø10)is clamping ø9.8 hole
Rod height = 7.82 - 2.35 × (-0.2) = 8.29 mm

CGC- N2□ E□

Expansion clamp

7MPa

Doubleacting

System configuration example

Expansion clamp
model CGC

Workpiece
guide 1

Expansion clamp
model CGC

Expansion clamp

Workpiece positioning pin(Round) 2

Workpiece guide

Workpiece positioning pin(Diamond) 2

Workpiece positioning pin(Round) 2

1

CGC

model CGC

Expansion clamp
model CGC

Workpiece guide

1

10mm and overExpansion clamp

Grip inner diameter D

Rod outer
diameter d
Diametral space
D-d and under

Expansion clamp
model CGC

Workpiece positioning pin(Diamond) 2

Expansion clamp
model CGC

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.jp35CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingHydraulic and pneumatic circuit diagram

Expansion clampⒹ Flow control valve②●

P.S. 1Ⓒ

Air sensor unit

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

①
●

5μm
Clamping
hydraulic pressure

Sensor air
0.2MPa(Recommended air pressure)

P.S. 2Ⓐ Solenoid valve

CGC

5μm
Unclamping
hydraulic pressureⒷ Flow control valve

Air blow((Meter-out control)

Exhaustwhen OFF)

0.3MPa(Recommended air pressure)● 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
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 misclamp detection function is disabled.

Air blowing

Incomplete clamping

Clamping
hydraulic pressure

Solenoid valve of

Solenoid valve ofⒶ air blow circuitⒶ air blow circuit

Unclamping
hydraulic pressure

Unclamping
hydraulic pressureON
Air blow

36

OFF
Exhaust(Sensor air)Sensor air

CGC- N2□ E□

Expansion clamp

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 the
Expansion clamp

gripper 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

CGC

be good enough to adjust the speed of clamp operation.
Clamping hole

Taper rod

Workpiece

Gripper
SleevePistonⒶ

PistonⒷ

Clamping hydraulic pressure

Unclamping hydraulic pressure

Unclamping hydraulic pressure circuitⒷ Flow control valve

Air sensor unit Ⓒ recommended condition of use

ISA3-F/G series
manufactured by SMC

Supplier andmodel

GPS2-05 , GPS3-E series
manufactured by CKD

Air supply
pressure

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.

To download CAD data / To get updated information, visit www.pascaleng.co.jp37

CGC- N2□ E□

Expansion clamp

7MPa

DoubleactingOperation cycle

Expansion clamp

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

Case of model CGC-N21E□
Workpiece

State

Clamping

loading

Air blow

ClampingOFF

completion 1(Machining)

Air blowON

Unclamping

Unclamping

Workpiece

completion 2

unloading

Workpiece Clamp
CGC

clamp

UnclampON

4

Air blowOFFON
Sensor air
OFF5

Clamping hydraulicpressure P.S. 1

OFF

ON

OFF

Unclamping hydraulicpressure P.S. 2

ON

OFF

ON

ON or OFF 3

Air sensor

1 : Clamping completion: P.S. 1＝ON

P.S. 2＝OFF

2 : Unclamping completion : P.S. 1＝OFF

P.S. 2＝ON

Air sensor＝ON

3 : ON : Complete clamping OFF : Incomplete clamping
4 : Solenoid valve control
5 : Hydraulic pressure switch, Air sensor signal

Case of model CGC-N22E□, CGC-N23E□
Workpiece

Stateloading

Clamping

Air blow

ClampingOFF

completion 1(Machining)

Air blowON

Unclamping

Air blow

Unclamping

Air blow

Workpiece

OFF

completion 2

ONunloading

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

ON or OFF 3

Air sensor

1 : Clamping completion

38: P.S. 1＝ON

P.S. 2＝OFF

Air sensor＝ON

2 : Unclamping completion : P.S. 1＝OFF

P.S. 2＝ON

Air sensor＝OFF

3 : ON : Complete clamping

OFF : Incomplete clamping

4 : Solenoid valve control

5 : Hydraulic pressure switch, Air sensor signal

OFFCGC- N2□ E□

Expansion clamp

7MPa

DoubleactingCaution in use

and over except for clamp mounting surface.

● Perform unclamping completion detection, clamping completion detection and incomplete clamping detection with
Expansion clamp● Be sure to make inner diameter of air blow circuit 4 mm

combination actions of pressure switch and sensor shown● Set the workpiece in such a way that the clamping hole ofworkpiece is perpendicular to seating surface. Clamping intilted condition results in uneven contact of gripper within table below. (Refer to hydraulic and pneumatic circuit
diagram on page →36 for details.)
Case of model CGC-N21E□

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

● Flaring (Biting) of gripper into workpiece varies depending

Applications

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

Unclamping
completion detection

OFF

ON

ー

Clamping
completion detection

ON

OFF

ON

Incomplete
clamping detection

ON

OFF

OFF

Case of model CGC-N22E□, CGC-N23E□

on workpiece material or thermal processing conditions.
With regards to conditions of workpiece and clamping hole,

Applications

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

Unclamping
completion detection

OFF

ON

OFF

Clamping
completion detection

ON

OFF

ON

Incomplete
clamping detection

ON

OFF

OFF

refer to page →15. 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 with

CGC

hole, which leads to concentration of load that may cause

gradient), 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.

● Set detection range of air sensor to 0.05 mm and underfrom seating surface. Insert a feeler gauge between workpiece and seating surface to create detection distance inorder to perform setting accurately. Refer to instruction
manual of air sensor for details on setting methods.

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

39