Authors: Alejandro Sandá; Carmen Sanz
Addresses: Advanced Manufacturing Technology Unit, IK4-TEKNIKER, 20600 Eibar, Spain ' Advanced Manufacturing Technology Unit, IK4-TEKNIKER, 20600 Eibar, Spain
Abstract: ZrO2-based ceramics are extremely difficult to manufacture, rotary ultrasonic machining (RUM) being an interesting machining process for these materials. In this work, ZrO2-NbC and ZrO2-WC ceramic composites have been RUM-processed and the differences in cutting forces, surface quality and dominant machining mechanisms under different machining operations and conditions have been studied. In ZrO2-NbC, the presence of the ductile fracture material removal mode is more evident than in ZrO2-WC, where the brittle fracture mode seems to be dominant. This contributes to a slightly better machinability of ZrO2-NbC compared to ZrO2-WC, what results in slightly higher material removal rates (MRR) and lower surface roughness.
Keywords: rotary ultrasonic machining; RUM; ZrO2-NbC; ZrO2-WC; ceramic; machinability.
International Journal of Machining and Machinability of Materials, 2020 Vol.22 No.2, pp.165 - 179
Received: 26 Sep 2018
Accepted: 16 Jan 2019
Published online: 09 Mar 2020 *