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

Series  (5)

Items  (34)

  1. single acting, without spring return – piston restoring force: 0.18 kN – stroke: 12 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 34.8 kN – as per catalogue sheet WZ 2.1300 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21300&dllang=en
  2. single acting, without spring return – piston restoring force: 0.27 kN – stroke: 12 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 54 kN – as per catalogue sheet WZ 2.1300 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21300&dllang=en
  3. single acting, without spring return – piston restoring force: 0.42 kN – stroke: 15 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 84 kN – as per catalogue sheet WZ 2.1300 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21300&dllang=en
  4. single acting, without spring return – piston restoring force: 0.70 kN – stroke: 15 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 137.2 kN – as per catalogue sheet WZ 2.1300 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21300&dllang=en
  5. single acting, with spring return – spring force: 0.26 kN – stroke: 12 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 34.8 kN – as per catalogue sheet WZ 2.1320 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21320&dllang=en
  6. single acting, with spring return – spring force: 0.36 kN – stroke: 12 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 54 kN – as per catalogue sheet WZ 2.1320 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21320&dllang=en
  7. single acting, with spring return – spring force: 0.50 kN – stroke: 15 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 84 kN – as per catalogue sheet WZ 2.1320 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21320&dllang=en
  8. single acting, with spring return – spring force: 0.75 kN – stroke: 15 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 137.2 kN – as per catalogue sheet WZ 2.1320 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21320&dllang=en
  9. for screw M12, single acting – piston return by separate spring – spring return force: 0.27 kN – stroke: 2.5 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 22 kN – as per catalogue sheet WZ 2.1330 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21330&dllang=en
  10. for screw M16, single acting – piston return by separate spring – spring return force: 0.67 kN – stroke: 3.0 mm – max. operating pressure: 400 bar – clamping force at 400 bar: 54 kN – as per catalogue sheet WZ 2.1330 – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ21330&dllang=en
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Description

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

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 2.1300

Hollow-piston cylinders 2.1320

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.

Hollow-piston cylinders 2.1320

Short-stroke hollow-piston cylinders 2.1330

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.

Short-stroke hollow-piston cylinders 2.1330

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

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 3.1403 , spring clamping

Hollow-piston cylinders 3.2130, single acting

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, hydraulic clamping

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.

PDF Data sheets

PDF

Hollow-piston cylinders single acting – without spring return – max. operating pressure 400 bar

Catalogue sheet WZ2.1300
PDF

Hollow-piston cylinders, single acting hydraulic clamping – spring unclamping – max. operating pressure 400 bar

Catalogue sheet WZ3.2130

Application examples

Application videos

Application examples 1-3

Hollow -piston cylinders 2.1300, single-acting without spring return, as pull or push cylinder.

Hollow-piston cylinder 2.1300
Hollow-piston cylinder 2.1300
Hollow-piston cylinder 2.1300

Application examples 4 - 6

Hollow -piston cylinders 2.1320, single-acting with spring return, as pull or push cylinder. Insertion or manifold mounting in any position.

Hollow-piston cylinders 2.1320
Hollow-piston cylinders 2.1320
Hollow-piston cylinders 2.1320

Application examples 7 - 8

Clamping of a form tool using a short-stroke hollow-piston cylinder 2.1330 and a mechanical flat clamping bar

Short-stroke hollow-piston cylinder 2.1330
Clamping of a form tool using a short-stroke hollow-piston cylinder 2.1330

Application example 9

Hollow-piston cylinders 3.2130
Use of hollow-piston cylinders in the press ram.

Hollow-piston cylinder 3.2130

Application example 10

Hollow-piston cylinders 3.2130

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

Hollow-piston cylinders 3.2130

Application example 11

Hollow-piston cylinders 3.2130 - Design "L"

Hollow-piston cylinders 3.2130 - Design "L"