TECHNICAL PAPER Internal turning of sintered carbide parts: tool wear and surface roughness evaluation Nivaldo Lemos Coppini 1 • Anselmo Eduardo Diniz 2 • Felipe Soares Lacerda 3 • Marcelo Bonandi 3 • Elesandro Antonio Baptista 3 Received: 12 June 2017 / Accepted: 10 October 2017 / Published online: 27 March 2018 Ó The Brazilian Society of Mechanical Sciences and Engineering 2018 Abstract Turning of sintered carbide parts has not been a common theme in the literature such as the case of other hardened materials. This is a statement made on the basis of recent research on this subject in which journals and conference proceedings were consulted. However, cutting of sintered cemented carbide parts, especially the turning operation, is an important task for a large number of applications where the typical properties of these materials are required. Therefore, the aim of this research was to carry out internal turning experiments in the manufacture of sintered cemented carbide dies used to forge beer cans. The focus of the experiments was to measure and analyze the workpiece surface roughness and wear of cutting edges used in internal turning process. Therefore, samples of sintered cemented carbide WC–Co (12% Co) were submitted to internal turning process with PCD insert tool. Cutting speed and feed rate were used as input variables in the experiments. It was found that, neither very low cutting speeds, nor high feeds can be used to avoid early breakage of the tool. Moreover, for the experiments where no early tool breakage occurred, the increase of feed caused the number of cutting passes prior to the cutting edge breakage to decrease and the workpiece surface roughness to increase. The experiments performed in this work confirm that sintered cemented carbide internal turning, besides being viable, is also feasible to be used to replace grinding operations, at least in terms of surface quality obtained. Keywords Hard turning Á Sintered cemented carbide Á Surface roughness Á Tool wear 1 Introduction The machining of hardened sintered materials is a process which has not received the proper attention in terms of research, as was observed during the literature review of this work. On the other hand, it is a process that deserves to be more carefully studied due to both, the challenges it presents and the optimization possibilities still to be dis- covered. As it will be seen below, some authors have studied the machining of hardened materials, in general, evaluating the performance obtained by applying different tools, different cutting conditions, or proposing Technical Editor: Ma ´rcio Bacci da Silva. & Nivaldo Lemos Coppini nivaldocoppini@gmail.com Anselmo Eduardo Diniz anselmo@fem.unicamp.br Felipe Soares Lacerda felipe.s.lacerda@hotmail.com Marcelo Bonandi marcelo.bonandi@sandvik.com Elesandro Antonio Baptista elesandro@elesandroab.eng.br 1 Universidade de Taubate ´, Rua Daniel Danelli, s/n, Taubate ´, Sa ˜o Paulo 12060-440, Brazil 2 School of Mechanical Engineering, University of Campinas, Campinas, Sa ˜o Paulo 13083-860, Brazil 3 Nove de Julho University, Rua Vergueiro 235, Sa ˜o Paulo 01504-001, Brazil 123 Journal of the Brazilian Society of Mechanical Sciences and Engineering (2018) 40:216 https://doi.org/10.1007/s40430-018-1139-z