Improvement of an industrial tool life for minting the circulating coins

Design and simulation of mechanical press for testing of coining tools with nanostructured coatings

“…The coating attempts to penetrate the same tool; these variations in long-term penetration influence the performance of the material and the adhesion to the substrate. As an example of penetration, when cracks are formed in the coating due to fatigue, the coin material penetrates those cracks and comes into direct contact with the punch material; it negatively affects the coining result [23], altering the quality of the final coinage, which is an indication that the coating has fulfilled its working life and that the coining tool must be replaced. Figure 26 shows the results of X-deformation and Y-deformation.…”

“…The adhesion is superior to veneering and other coating processes where mechanical bonding occurs [6]. The excellent results of the behavior and the contribution in the surface resistance of nanostructured films' physical properties in the most demanding works [7] are an impulse to stimulate the research and development of a great variety of nanostructured unique properties materials [8]. Based on these findings, a concept of high hardness coatings has been developed, the films with hardness H<40 GPa and H>40 GPa are currently described as hard and super hard, respectively [9].…”

“…One of the materials currently being implemented and under which the FEA analysis is based in the present study is titanium nitride (TiN), which has a hardness range of 2500 HV to 3000 HV (24 GPa to 30 GPa) [6]. In previous studies, the TiN coating shows a low coefficient of friction, and in pin-on-disk tests, it shows resistance to excessive wear at ambient temperature and high temperatures, up to 500 °C [7]. The microstructure and the coating film thickness strongly influence the nanostructured coating failure mechanism [10].…”