EoW May 2013

Technologynews

▲ ▲ Cost effective newmethod from FR and H Lüling

Possibilities for cold massive forming

company has used a combination of three components. The phosphate layer has been replaced by a special coating consisting of organic and inorganic chemicals. By using a special heat treatment and drawing die technology, a wire surface will be obtained, which allows an optimal forming of the material. zero P is easily removed after the forming process as, in contrast to phosphate treatment, there is no chemical reaction with the basic material. With this new development, Lüling offers not only financial savings but also supports the manufacturing chain as far as the environmental aspects are concerned. FR and H Lüling GmbH & Co KG – Germany Website : www.lueling.com

The dephosphorising process of the forged parts in the manufacturing chain was not only very expensive but also extremely environmentally unfriendly. Depending on the geometry and the tensile strength of the forged part, heat treatment is necessary. However, there is a danger of getting a delta-ferrite microstructure, if the dephosphorising process is carried out adequately. These are only some of the reasons why the cold forging industries want to use wire with a phosphate-free surface. Lüling has faced this challenge. In cooperation with customers, chemists and universities the company has developed a product which has met these high standards in cold forging industry.

FR and H Lüling, located in Altena and Iserlohn, Germany, has developed a new method for surface treatment for the manufacture of wire in the process of cold massive forming. With zero P, Lüling has developed a phosphate free surface which enables multi-station forging processes. In the past, wire that had a phosphate coated surface was used exclusively in the production of complex cold extrusion parts. However, besides the advantages in manufacturing process, there are also disadvantages in subsequent course of the process, resulting from the phosphate coated surface. The fact that the phosphate residue slowly contaminated the extrusion oil had to be accepted.

For the manufacture of zero P, the

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EuroWire – January 2012

May 2013