Several blanks that are stacked next to each other

Raw rings

Our seamlessly rolled rings are manufactured in the most modern ring-rolling mills by our companies in Germany, the USA and China. With a manufacturing area with a 300 to 8,000 mm outer diameter, we are able to offer our customers a wide range of seamlessly rolled rings. CNC ring-rolling programmes in manufacturing enable optimal quality and reproducibility.

rothe erde® impress with their performance, which they owe to the seamless rolling process. Warm treatment generates the many mechanical properties demanded of the rings. Besides the normalising, the tempering and soft annealing of the rings enables programmed processes for all (special) materials to comply with the specific time-temperature provisions most accurately.

 Half blank on a white background

Faster delivery times for our rothe erde® raw rings thanks to an investment in a 6,000 t press

The press enables us to produce raw rings with a unit weight of 400 kg up to 25 t. The maximum diameter of the forged discs is 2,500 mm and their height is up to 830 mm. This production spectrum makes it possible to shorten the production time significantly, because the pre-forging on an open-die press is not necessary and therefore the forged disc is further processed directly on the ring mill.

The press offers many advantages, including:

  • High manufacturing precision

  • Shortening of production times

  • Increase in energy efficiency

  • Ensured product quality through degree of automation

  • Production of various materials (steel, aluminum, Ni-based, titanium, etc.)

Another advantage is that the press operates fully automated. The programmed sequence and the continuous process monitoring ensure the usual thyssenkrupp rothe erde product quality and throughput of the forged rings. With us, you have a reliable partner on your side.

The investment also takes us a step closer towards sustainability. Our mission is to manufacture our products with as few emissions as possible. The two swivel arms of the press are equipped with hydraulically operated scrapers. This means that we can forego the usual use of propellants such as charcoal. In addition, there are hardly any dust emissions from the press.

 Annealing of the raw material on a 6,000 t press
The glowing raw material is crushed on a 6,000 t press
 Raw material compressed into a ring on a 6,000 t press

We think regionally and act globally!

Thanks to our EN9100: 2018 certification for aerospace products, our rings do not have to stay on the ground - they can even leave the earth.

How does the 6,000 t press work?

The raw material is upset at up to 50 mm / s. The press ram presses the raw material together with a delivery volumeof 730 l / min hydraulic oil and a pressure of up to 400 bar.

The preform for our ring mill is produced on the press in 4 strokes:

  • Step 1 - Pre-upsetting: A punch presses the raw ring into a disc.

  • Step 2 - Pre-punching: A hole is pressed into the now flat disc with a mandrel, the ends are arching.

  • Step 3 - Completely compress: The bulge from step 2 is leveled.

  • Step 4 - Perforation: the disc is perforated.

Graphic representation of the ring press production process

It is still extremely exciting to see how large, glowing steel blocks are shaped like toy clay into the shape of a disk. You can well imagine how great the forces must be that are used here.

Thomas Reip
Plant Manager Dortmund