Manufacturing Technology 2014, 14(3):309-317 | DOI: 10.21062/ujep/x.2014/a/1213-2489/MT/14/3/309

Coating Surface Roughness Measurement Made On Coining Dies

Tomáš Hanes1, Pavol Hvizdoš2, Miroslava Ťavodová1, Daniela Kalincová1, Júlia Hricová1, Pavel Beňo1
1 Faculty of environmental and manufacturing technology, Technical University in Zvolen. Študentská 26, 960 53 Zvolen. Slovak Republic
2 Institute of Materials Research, Slovak Academy of Sciences. Watsonova 47, 040 01 Košice. Slovak Republic

The paper describes the surface roughness measurement of functional parts of tools for minting coins. The coining dies were coated with three types of coatings - CrN, TiCrN and WC/C. Roughness of the coining die surface is a very important factor for the quality of a struck coin. The quality of specific coatings on the coining die surface was evaluated by a contact (Hommel Tester T500 roughness measurement device) and contactless method (microscope Sensofar PLu neox) by using optical interferometry and confocal microscopy. Results from the shop measurement gained by using the roughness measurement device were compared to the laboratory measurements gained by using microscope. Moreover, results were illustrated in the graph. Measured values were identical. Only the CrN coating showed bigger difference. Minimum roughness value was measured on the coining die with the TiCrN coating. The WC/C coating reached the maximum roughness value. 3D visualization method of surface roughness using software Gwyddion proved inappropriate for burnished surfaces.

Keywords: roughness, coining die, roughness measurement device, optical interferometry, confocal microscopy

Published: October 1, 2014  Show citation

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Hanes T, Hvizdoš P, Ťavodová M, Kalincová D, Hricová J, Beňo P. Coating Surface Roughness Measurement Made On Coining Dies. Manufacturing Technology. 2014;14(3):309-317. doi: 10.21062/ujep/x.2014/a/1213-2489/MT/14/3/309.
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