F. Táncsics(1*), E. Halbritter(2)

(*) Corresponding Author

Pvd Coating and Up-to-date Wear Test of Hot-Forming Tools


Recently, the requirements for decreasing the tool costs have been increased in forging technologies. These costs could be decreased by increasing the lifetime of the tools. In hot-forming there is a new possibility to increase the lifetime, namely: Physical Vapour Deposition (PVD) coating of the tools. Participants in testing the effects of coating were the employees of the Universtiy Széchenyi István, Rába Axle Ltd., Fraunhofer Institut für Schicht- und Oberflächentechnik Braunschweig and Westsächsische Hochschule Zwickau. Lately, pre-upsetting used in production lines served by robots – as upsetting made between parallel pressure plates used frequently in die-forging – was used to make wear tests. In the wear tests, the friction work according to the energetic model was calculated by applying a kinematically admissible velocity field, which takes into account the friction coefficient and the local displacements. Expectable friction coefficient – using the results of previous researches – has been determined based on geometrical data of the pre-upset work-piece.


PVD coating; tool; upsetting; mathematical modeling of material flow; wear

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