Study on the wear behavior of uncoated and thin film coated tools used in cold forming operations. / Estudo do desgaste de ferramentas com e sem revestimentos de filmes finos utilizadas em operações de conformação a frio.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This work is devoted to the study of wear mechanisms in cold forming tools, such as punches and dies. The text begins with a discussion on the galling phenomenon, which is the main wear mechanism that takes place in cold forming operations. A brief analysis of the tribological behavior of punches that have operated in industrial conditions is then presented. Tests of sliding wear without repetition of the wear track were conducted in CNC lathes, considering the contact of materials normally used in cold forming operations. AISI M2 tool steels with and without TiN and AlTiCrN coatings were slided against AISI 1045 steel. Friction force results and microscopic surface observations were analyzed in order to qualify different tests conditions. Both coated tools conditions presented a better tribology performance than the uncoated ones and an inversion in performance was observed between the coated tools: the AlTiCrN coated tool had a better performance in milder conditions, while the TiN coated tool presented a better performance in more severe conditions. This inversion in performance was attributed to the surface finish of the coatings.

ASSUNTO(S)

sliding wear tests tribology desgaste adesivo sliding wear tribologia filmes finos ensaios dos materiais thin films

ACESSO AO ARTIGO

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