PVD Coating and Up-To-Date Wear Test of Hot Forming Tools

Tancsics, Ferenc and Halbritter, Ernő (2012) PVD Coating and Up-To-Date Wear Test of Hot Forming Tools. HUNGARIAN JOURNAL OF INDUSTRY AND CHEMISTRY, 40 (1). pp. 19-24. ISSN 0133-0276

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Abstract

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.

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