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Hollow-piston cylinders

Hollow-piston cylinders for press bed and ram

In connection with tie rods, screws and threaded rods, for clamping and locking dies on presses and machines

max. clamping force: 22 ... 137 kN
clamping stroke: 2.5 ... 15 mm

Series Data sheet Technical data
3.2130
3.2130
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WZ 3.2130 Hollow-piston cylinders, single acting

 

hydraulic clamping

spring unclamping

max. operating pressure 400 bar

max. clamping force: 60 .. 104 kN
(on request 160 kN)
for T-slots: 18 .. 36 mm
piston diameter: 54 .. 70 mm
stroke: 12 mm

2.1300
2.1300
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WZ 2.1300 Hollow-piston cylinders

 

single acting

without spring return

max. operating pressure 400 bar

clamping force: 34.8 .. 137.2 kN
clamping stroke: 12 .. 15 mm
Piston restoring force: 0.18 .. 0.7 kN
piston area: 8.7 .. 34.3 cm²

2.1320
2.1320
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WZ 2.1320 Hollow-piston cylinders

 

single acting

with spring return

max. operating pressure 400 bar

max. clamping force: 34.8 .. 137.2 kN
clamping stroke: 12 .. 15 mm
spring force: 0.26 .. 0.75 kN
piston area: 8.7 .. 34.3 cm²

2.1330
2.1330
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WZ 2.1330 Hollow-piston cylinders

 

single acting

max. operating pressure 400 bar

max. clamping force: 22 .. 54 kN
clamping stroke: 2.5 .. 3 mm
spring force: 0.27 .. 0.67 kN
piston area: 5.5 .. 13.5 cm²
fixing screw: M12 .. M16

3.1403
3.1403
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WZ 3.1403 Hollow-piston cylinders

 

spring clamping

single acting

clamping force 50 kN

max. clamping force: 50 kN
for T-slots: 22 .. 28 mm
unclamping stroke: 2.5 mm
unclamping pressure: 175 bar

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figure 1: Hollow-piston cylinders 2.1300










 
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figure 2: Hollow-piston cylinders 2.1320
 
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figure 3: Short-stroke hollow-piston cylinders 2.1330




 
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figure 4: Hollow-piston cylinders 3.1403 , spring clamping












 
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figure 5: Hollow-piston cylinders 3.2130, hydraulic clamping
 

Applications:
In connection with tie rods, screws and threaded rods, for clamping and locking dies on presses and machines

Special features:

  • flat and compact design
  • jerkyless piston movement
  • stroke limitation designed for max. operating pressure
  • easy retrofit
  • ideal force transmission

Hollow-piston cylinders 2.1300 (figure 1)
single-acting without spring return, as pull or push cylinder.
Installation is possible by insertion, screwing in or manifold mounting in any position. The clamping force is generated by applying hydraulic pressure to the piston, and unclamping is made mechanically by external force effect.
The piston is provided with a through hole and is hardened and ground. The housing of the hollow-piston cylinder is made of high alloy steel, the surface is black oxided.

Hollow-piston cylinders 2.1320 (figure 2)
single-acting with spring return, as pull or push cylinder.
Installation is possible by insertion or manifold mounting in any position. The clamping force is generated by applying hydraulic pressure to the piston, and unclamping is made mechanically by spring return.
The piston is provided with a through hole and is hardened and ground. The housing of the hollow-piston cylinder is made of high alloy steel, the surface is black oxided.

Short-stroke hollow-piston cylinders 2.1330 (figure 3 )
single acting, as pull or push cylinder.
The clamping element is particularly suitable for clamping mechanical clamping bars on die bending presses and folding presses. The clamping force is built up by applying hydraulic pressure to the piston. The piston is returned by a spring which is installed in the clamping bar. The piston is provided with a through hole and is hardened and ground. For an optimum adaptation to the clamping surface, the hollow-piston cylinder can be equipped with a spherical disk.

Special versions
Customised special versions can be easily realised:
For example,with regard to size, clamping force, clamping stroke or double acting versions.
Please contact us.

Hollow-piston cylinders 3.1403 , spring clamping (figure 4)
Manual positioning of the element on the die clamping edge.
Unclamping by the application of hydraulic pressure to the piston and clamping by spring force. By means of the T-bolt the die is clamped against the clamping surface of the press ram or bed.

Applications

  • unpressurised long-term clamping of dies or fixtures on press beds and rams
  • when the available space is limited


Special features

  • hydraulic supply is only required for unclamping, i.e. for a short time
  • ideal force transmission
  • convenient and compact design with gripping surface
  • no interfering edges when inserting the dies
  • easy retrofit
  • easy installation

Hollow-piston cylinders 3.2130, single acting (figure 5)
Manual positioning of the element on the die clamping edge.
Clamping by the application of hydraulic pressure to the piston and unclamping by spring force.
By means of the T-bolt the die is clamped against the clamping surface of the press ram or bed.

Applications

  • on press beds and rams
  • on machines and equipments for clamping and locking
  • when the available space is limited
  • at environmental temperature up to 120° C


Special features

  • optimum adaptation to the clamping surface by spherical disk
  • T-bolt, secured against loosening
  • ideal force transmission
  • convenient and compact design with gripping surface
  • clamping force from 60 kN up to 104 kN
  • large clamping stroke
  • no interfering edges when inserting the dies
  • easy retrofit
  • piston hardened and ground
  • easy installation
  • fully resilient stroke limitation

Versions
Hollow-piston cylinders
with spherical disk for the adaptation to the clamping surface with adjusted and secured T-bolt (alternatively: without or with attached T-bolt)

Hollow-piston cylinders - ”L” design, without spherical disk for the adaptation to the clamping surface. T-bolt attached

Hollow-piston cylinders 3.2130 - Versions

Version with a total stroke of 20 mm
Optimum adaptation to varying heights of the clamping edges of dies by an increased total stroke of 20 mm (higher total stroke on request).
Technical design, clamping forces and dimensions are as indicated on data sheet 3.2130 for the standard design.

Version with variable clamping dimension
Freely adjustable and flexible adaptation to suit varying heights of clamping edges of the dies by quick and easy adjustment of the tie rod by means of a lock nut. The tie rod is inserted through the hollow-piston cylinder and adjusted to the the correct dimension by means of the lock nut.
In this version, the cylinder has a through hole instead of a thread. Technical design, clamping forces and dimensions are as shown on catalogue sheet 3.2130 for the standard design.

 
  • Fittings

data sheet 11.2800

  • high-pressure hoses
  • quick-disconnect couplings
  • connecting block
  • plug-in connectors

data sheet 11.3800

  • directional control valve
  • pressure switch
  • pressure relief valve
  • pressure control valve
  • pressure gauge
  • check valve
  • hydraulic oil

data sheet 11.9200

Hydraulic power units for die clamping systems:
Hydraulic power units

Parking stations during die change
for hollow-piston cylinders
=> see on the respective data sheets

Angular rotary coupling
Part no. 9208-176

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figure 1: Hollow-piston cylinder 2.1300
 
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figure 2: Hollow-piston cylinder 2.1300
 
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figure 3: Hollow-piston cylinder 2.1300
 
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figure 4: Hollow-piston cylinders 2.1320
 
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figure 5: Hollow-piston cylinders 2.1320
 
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figure 6: Hollow-piston cylinders 2.1320
 
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figure 7: Short-stroke hollow-piston cylinder 2.1330
 
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figure 8: Clamping of a form tool using a short-stroke hollow-piston cylinder 2.1330
 
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figure 9: Hollow-piston cylinder 3.2130
 
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figure 10: Hollow-piston cylinders 3.2130
 
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figure 11: Hollow-piston cylinders 3.2130 - Design "L"
 

Application examples 1-3 (figures 1 - 3)
Hollow -piston cylinders 2.1300, single-acting without spring return, as pull or push cylinder.

 

 

Application examples 4 - 6 (figures 4 - 6)
Hollow -piston cylinders 2.1320, single-acting with spring return, as pull or push cylinder. Insertion or manifold mounting in any position.

 

 

 

 

 

 

 

 

 

 

Application examples 7 - 8 (figures 7 and 8)
Clamping of a form tool using a short-stroke hollow-piston cylinder 2.1330 and a mechanical flat clamping bar

 

 

 

 

 

 

 

Application example 9 (figure 9)
Hollow-piston cylinders 3.2130
Use of hollow-piston cylinders in the press ram.

 

Application example 10 (figure 10)
Hollow-piston cylinders 3.2130

Use of 32 hollow-piston cylinders in a press.
Reduction of set-up times by 30 %.

 

Application example 11 (figure 11)
Hollow-piston cylinders 3.2130 - Design "L"