Poppe + Potthoff Autofrettage Machines

The Autofrettage is a method for increasing the fatigue strength of components for use at high and pulsating pressures.

The autofrettage method is based on the reciprocal relationship of the plasticized inner zone and the elastically deformed outer zone. The components are placed under so much pressure that their interiors become plastically deformed. After relaxing, pressure stresses are created in these areas. This prevents the outer zone from resuming its original shape. Instead, it remains stretched. This prevents crack formation in the later application, increases the service life of the components, and thus offers the corresponding cost reduction potentials. Of course, our systems are UL or CE compliant as required. In addition, we offer you direct on-site service and support.

Serial Autofrettage for rails

Autofrettage prototypes and development


Autofrettage plant for diesel injection lines

For High-pressure Components

Poppe + Potthoff Maschinenbau offer equipment for the precisely defined Autofrettage of prototypes and standard components, which are subject to a constant change of high and low pressures.


  • Components for high-pressure hydraulic and diesel injection systems
  • Pressure vessels, gas cylinders and components for water-jet cutting systems
  • Pipes for chemical plant construction, plant and power station construction
  • Pressure sensors and transmitters

In general, we also offer autofrettage in the relevant pressure areas as a service. Whether for research and development or for one-time prototypes, please contact us with your test requirements for a non-binding offer.

For various autofrettage machines, please click on the following applications:

With these systems, the durability of common rails can be increased in series. Autofrettage is performed automatically after the rails are inserted, with several radial and axial sealing points provided.

The test system consists of two subassemblies that are combined into a single compact unit. The pressure generation system and the electric control cabinet are installed on the left side. The right side was designed as a test chamber. An automatic door is installed in front of the chamber. A safety lens in the protective door allows for a good observation of the test object. The protective door cannot be opened during the auto-frettage, since a mechanical interlock occurs via the safety switch. On the left side, the pressure converter is installed in a horizontal position.

Performance data:

  • Auto-frettage-Pressure up to 12,000 bar
  • High Product variability, individual auto-frettage-program
  • Automatic tensioning of different rail types from 200 mm to 1,300 mm length

The Autofrettage system is a research and development facility. Due to the high product variability, various components or prototypes can be autofretted on the system. The Autofrettage pressure is freely programmable. The control panel is located at ergonomic height on the right side. All relevant data is displayed to the operator and can be quickly edited at any time.

Performance data:

  • 16,000 bar Autofrettage pressure
  • High product variability
  • Plant for research and development as well as prototype Autofrettage

Autofrettage schedule

  • Inserting the assembly into a device
  • Close the protective door, close the sealing tips of the clamping device with minimum pressure
  • Filling-up the system
  • Position the pressure converter
  • Autofrettage pressure build-up with proportional clamping pressure increase
  • Pressure-holding time and auto-frettage
  • Pressure reduction
  • Sealing tips and protective door
  • Remove component

Because of its high variability, Universal Autofrettage is ideal for research and development purposes as well as for smaller series. It increases the fatigue strength of high-pressure components such as pipelines, valves, rails, pump heads and pressure vessels.

For variable geometries
components with different geometries can be flexibly auto-fretted on this system. The conversion is carried out by changing the device. The Autofrettage parameters are freely programmable and editable.

Pressure converter
The pressure converter consists of a drive and a high-pressure part. The hydraulically-driven pressure converter also acts as a mediator.

Drive part
The actuator is driven by the linear drive part. It is designed as a hydraulic cylinder. The components are a piston rod with piston as well as a cylinder tube with cylinder bottom and cylinder cover. A displacement measuring system is connected to the piston. The displacement transducer indicates the position of the pressure converter. The hydraulic pressure is fed into the cylinder bottom.

High-pressure part
High pressure is created in the high-pressure part of the pressure converter. The actual pressure of up to 16,000 bar is measured in the high-pressure circuit. The control takes place via a proportional valve. The piston position of the pressure converter is detected by a remote measuring system. The stroke length and the lifting speed are monitored during the pressure build-up.

Performance data:

  • Autofrettage pressure up to 16,000 bar
  • change devices and proportional jig for round and cubic component geometries
  • Freely programmable pressure increase and electronic measuring data acquisition

High pressurelines for diesel injection are automatically prepared with this system for continuous use at pulsating pressure in series. Different components can be auto-fretted with the system. The conversion is carried out by changing the device.

In-tens series
For manual insertion and removal of up to ten lines, a protective disc opens in front. The control panel is on the right. Here, The Autofrettage pressure can be programmed. All other relevant data is also displayed to the operator.

Performance data:

  • Autofrettage pressure up to 9,000 bar
  • Tensioning pressure proportional
  • Five different line types
  • 10-way station

Your request

Contact us

Stefan Dreyer


Johannes Montag

CEO / Head of Sales

Frank Baudler


+49 3631 46221022


Philip Claussen

Poppe + Potthoff Maschinenbau America

+1 617 250 7668

For further testing solutions, click the following product areas:

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15 locations in 9 countries.

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