Pre-Bending Presses

Whether for pipelines, large vessels or wind towers: Graebener® offers customized solutions for optimum pre-bending results for almost any types of applications. Graebener® pre-bending presses reduce the straight plate ends of bent pipes already prior to the bending process. They are ideally suitable for large wall thicknesses of up to 150 mm and are also used reliably for the production of cylindric pipes as well as conical shell sections.

Whether for pipelines, large vessels or wind towers: Graebener® offers customized solutions for optimum pre-bending results for almost any types of applications. Graebener® pre-bending presses reduce the straight plate ends of bent pipes already prior to the bending process. They are ideally suitable for large wall thicknesses of up to 150 mm and are also used reliably for the production of cylindric pipes as well as conical shell sections.

OverviewConcepts

In the production of LSAW pipes and pipe sections, the Graebener® pre-bending presses carry out the first bending step of the steel plates. The plate edges are pre-bent prior to the downstream bending process so that the straight plate ends of bent pipes are reduced to a minimum.

Based on our many years of experience as former manufacturer of LSAW pipes we offer customized pre-bending solutions as special machine builder. Depending on the type of application and your individual requirements we use two different methods of pre-bending: in case of plates with a wall thickness of 150 mm both plate edges are pre-bent subsequently over the entire plate width. In case of plates with a smaller wall thickness of up to 75 mm a step-by-step process is used where both plate sides are pre-bent simultaneously in several steps throughout a length of up to 20 meters.

Our solutions are ideally suited for a wide range of plate dimensions.

Plate width:

up to 4.3 m

Wall thickness:

up to 150 mm

Individual plate weight:

up to 70 t

Graebener® pre-bending machines are no standard solutions. Over decades we have been specializing as manufacturer of customized machines following the ever-increasing quality requirements of pipe respectively wind tower production. Our machines are customized to your requirements and designed for the applied materials and quality classes. Our mission is that your Graebener® machine makes you better. Irrespective of whether you invest in a new Graebener® machine or whether you choose a Graebener® retrofit solution.

On the basis of the following machine concepts we find the optimum solution for you:
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Graebener® 1-Side Pre-Bending Press, Type GAB-E
Graebener<sup>®</sup> 1-Side Pre-Bending Press, Type GAB-E
  • Suitable for a wall thickness of up to 150 mm
  • Pre-bending of conical shell sections is possible
  • Deflection compensation over the entire pre-bending length of 4 m
  • Automated positioning device for the plate handling during the pre-bending process
Graebener® 2-Side Pre-Bending Press, Type GAB-Z
Graebener<sup>®</sup> 2-Side Pre-Bending Press, Type GAB-Z
  • Simultaneous pre-bending of both plate sides
  • In contrast to the conventional roller pre-bending methods, there is no roll-out of the plate edges and no crushed edges
  • Prevention of plate waviness in the pre-bent edges which leads to a zero gap without edge offset for an optimum weld seam preparation
  • Suitable for various materials and especially for the forming of Clad pipes
  • Particularly suitable for plates with increased wall thickness in high steel qualities and special grades
  • Cost-efficiency due to innovative tool design, minimum re-working (subsequent impanding is not necessary) and prevention of waste
Graebener® Calibration and Straightening Press with Pre-Bending Option, Type GKP-A
Graebener<sup>®</sup> Calibration and Straightening Press with Pre-Bending Option, Type GKP-A
  • Patented 4in1 Graebener® technology for highly flexible production
  • Combines the advantages of calibration and straightening press with those of the 2-side pre-bending press

You buy a Graebener® solution

You get more than just a machine or system. You get a reliable partner who understands your processes and who develops the optimum solution for the market challenges together with you.

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