Abstract
Surface texture of stamping tools affects the performance of the tool, tool life, and surface quality of the stamped product. In this work, punch samples were machined after heat treatment by milling and turning strategies in super finish processes and part of the punches were submitted either to plasma nitriding or nitrocarburizing treatment before the experiments using hot stamping of washers, which were made in two stages. Based on roughness results, for non-treated punches, most of the milled punches presented more intense surface damage than turned punches after hot stamping process, possibly due to the marks left by machining processes, affecting mechanical obstacles to wear evolution and lubricant retention on punch surface. For nitrided punches, surface damage was less intense than it was on non-treated punches. Parallel contours strategy and turning upward strategy presented less intense surface damage after the hot stamping process. For nitrocarburized punches, surface damage was less intense than it was to non-treated punches, mainly for milling strategies. SEM images of nitrided and nitrocarburized punches suggested alveolar corrosion occurrence during hot stamping process for circular upward strategy.
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Acknowledgments
The authors acknowledge “Fundação de Apoio à Pesquisa do Estado de São Paulo (FAPESP)” (process number 2013/00551-7), DEMM-FEM/UNICAMP, and Ace Supertrat LTDA, which cooperated with heat treatment and nitrocarburizing processes, for making this paper possible.
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This work was funded by Fundação de Amparo à Pesquisa do Estado de São Paulo (grant number 2013/00551–7) and University of Campinas (Brazil), university where two authors work (Diniz and Button) and where one author (Castanhera) used to be a doctorate student during the work execution.
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da Costa Castanhera, I., Diniz, A.E. & Button, S.T. Effects of plasma nitriding and nitrocarburizing thermochemical treatments and surface texture on surface damage evolution of hot stamping punches. Int J Adv Manuf Technol 112, 2341–2358 (2021). https://doi.org/10.1007/s00170-020-06424-1
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DOI: https://doi.org/10.1007/s00170-020-06424-1