Optimization of Cooling and Lubrication for Nitrided and Ceramic-Coated Hot Forging Dies

Jan Puppa; Bernd-Arno Behrens

doi:10.4028/www.scientific.net/AMM.794.97

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Superimposed Oscillating and Non-Oscillating Ring Compression Tests for Sheet-Bulk Metal Forming Technology
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 794Optimization of Cooling and Lubrication for...

Optimization of Cooling and Lubrication for Nitrided and Ceramic-Coated Hot Forging Dies

Abstract:

In order to enhance the tool life of hot forging dies, increasing the wear resistance of the forming tool surface is of great importance. In addition to thermal and thermo-chemical surface treatments, methods applying thin wear-resistant coatings gain more importance. Therefore, ceramic-based mono- or multilayer hard coatings are used in combination with a supporting nitride layer. Due to their low material-specific thermal conductivity, ceramic coatings have an increased sensitivity to abrupt temperature changes. To avoid such thermal shocks, an adjustment of the cooling behaviour is required. This paper presents the results of laboratory forging tests conducted under different cooling and lubrication conditions on nitrided dies with ceramic coatings. By means of a selective cooling of the forming tool surface and using boron nitride as lubricant the wear behaviour of the forging dies could be improved.

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Periodical:

Applied Mechanics and Materials (Volume 794)

Pages:

97-104

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.794.97

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Online since:

October 2015

Authors:

Jan Puppa*, Bernd-Arno Behrens

Keywords:

Forging, Hard Coatings, Wear

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