Hydroforming Press for the Serial Production of Bipolar Plates

Gräbener Maschinentechnik GmbH & Co. KG

  • Advantages of hydroforming press: repeatable precision, attention to detail and high value
  • Plate size: up to 2,500 cm2
  • Foil thicknesses: from 50 μm
  • Materials: Stainless steel, titanium, copper, clad materials; also pre-coated (e.g. Alleima Sanergy®)
  • Sandwich tool: simultaneous production of several plates per stroke

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Hydroforming press for serial production of bipolar plates for fuel cells and electrolyzers

  • We have developed our patented Graebener hydroforming press especially for the economic production of metallic bipolar plates for fuel cells and electrolyzers and have made it ready for series production
  • With our sandwich tool, several plates can effortlessly be produced simultaneously per stroke, e.g. the cathode and anode side
  • As a pioneer in hydroforming, we deliberately rely on the process for which we are known worldwide as experts for the production of bipolar plates

Hydroforming

  • Hydroforming  or external high-pressure forming  is an active media forming process
  • A metal foil is inserted into a tool gravure and expanded into the forming tool with very high pressure by means of a water-oil-emulsion
  • Thanks to the even pressure distribution over the entire foil surface, an homogeneous material thickness distribution is achieved, and abrupt stress transitions are avoided
  • This allows forming even the smallest radii. The material spring back remains low

Features

  • Plate size: up to 2,500 cm2
  • Foil thicknesses: from 50 μm
  • Materials: stainless steel, titanium, copper, clad materials; also pre-coated (e.g. Alleima Sanergy)
  • Sandwich tool: simultaneous production of several plates per stroke

Benefits

  • External high-pressure forming
  • Extremely filigree structures can be realized in series using extremely thin materials from 50 μm
  • In contrast to mechanical forming, which at first glance may seem more cost-effective, especially for series production, hydroforming offers numerous advantages that pay off in the long term
  • Since bipolar plate production is all about repeatable precision, attention to detail and high value, we believe that hydroforming is the optimal process and one of the quality features that makes Graebener® Bipolar Plate Technologies your sustainable competitive edge.

Application areas

  • Engineering of producibility from CAD designs
  • Production of metal bipolar plates for fuel cell application
  • Production of metal separator plates for electrolysis application
  • Production of metal bipolar plates for heat exchanger application

Contact us

  • Let us help you out in getting the most efficient hydroforming press for your bipolar plates production
Brand Graebener
Gräbener Maschinentechnik GmbH & Co. KG Graebener® Bipolar Plate Technologies is part of Graebener® Maschinentechnik, a medium-sized, family owned machine building company with locations in Netphen (Germany) and Houston (USA) as well as various international representatives. For 20 years, Graebener® has been one of the first companies to focus on the research and development of manufacturing processes and machines for fuel cell and electrolyzer components. The company has dedicated itself to setting the quality standard for manufacturing technologies by developing innovative processes and machines that help to manufacture fuel cell and electrolyzer components, such as the metallic bipolar plate, that are tailor-made, integrable, scalable and thus economically efficient. For this purpose, Graebener® accompanies all strategically important steps towards the optimally designed production line: Starting from engineering with a view to plate design and line concept via prototyping and small series production in the in-house production laboratory up to the customized production machine or line. Experience from more than 100 years of metal processing and worldwide customer-specific special solutions are incorporated into the holistic development partnership with the customer.
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