Separating Additively Manufactured Aerospace Parts
Here’s how Ohnhäuser GmbH is using BEHRINGER GmbH’s 3D bandsaw to accurately separate additively manufactured aerospace parts from the printing plate.
Additive manufacturing of parts continues to gain a foothold, particularly in applications where typical production techniques reach their limits. One of the clear advantages of 3D printing technology is the seemingly limitless shapes and structures of the creations. Even a moving group of parts can be printed as a complete unit, so there is no need for post-production assembly.
In the last year, BEHRINGER GmbH added two new models to its product portfolio with its new 3D series—the HBE320-523 3D and LPS-T 3D. The high-performance bandsaw machines were developed to separate additively manufactured parts of different shapes and sizes.
Ohnhäuser GmbH from Wallerstein is primarily known as a contract manufacturer and premium supplier for the aerospace industry. To manage the demands of manufacturing bionically constructed parts, the company expanded its production methods to include additive manufacturing. In the latest stage of development in 3D printing, Ohnhäuser is concentrating on the use of a special titanium powder, optimised for aerospace requirements. As a material, titanium boasts strength characteristics in the range of tempered steel with a comparatively low weight. An EOS M 290 printer is used to generate the 3D metal parts.
After additive manufacturing, the titanium parts must be separated from the printing plate. While carrying out research into a suitable separation process it became clear that only a saw system would make the cut. “We then contacted BEHRINGER to ask what solutions our bandsaw manufacturer could offer” recalls Moritz Färber. “Ohnhäuser had been using a bandsaw machine from BEHRINGER for several years, so we knew the company was a high-quality and reliable manufacturer of saw machines.”
Precision Sawing of a Range of Materials
When it comes to highly-sensitive 3D printing, accurate separation of the part from the printing plate is essential. Deviations in the cut or drifting out of the cutting channel is not permitted, as this would damage either the base plate or the printed parts.
The HBE320-523 3D is based on the already established HBE Dynamic series—featuring robust construction, energy-efficient drive system, and above all, accurate sawing. It cuts the inserted materials with precision to a tolerance of tenths, whether it be steel, aluminium, nickel-based alloys, titanium or plastic. The bandsaw blades can also be quickly and flexibly changed to suit the material that is being sawn. All the machine’s blade-guidance parts are cast in Behringer’s in-house foundry. The grey cast iron dampens vibrations and reduces unpleasant background noise during cutting. All these factors have a positive effect on the sawing process, resulting in high cutting performance and a long bandsaw service life.
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