Eventos Anais de eventos
COBEF 2021
11th Brazilian Congress on Manufacturing Engineering
TOOL WEAR ANALYSIS OF THE PVD-TIALN COATED FINE-GRAIN CEMENTED CARBIDE TOOLS IN THE HARD TURNING OF AISI 4340 STEEL
Submission Author:
Caroline Francisco Dorneles , SC
Co-Authors:
Caroline Francisco Dorneles, Denis Boing, Rolf Schroeter
Presenter: Caroline Francisco Dorneles
doi://10.26678/ABCM.COBEF2021.COB21-0121
Abstract
The hard turning processes are usually performed using PCBN or ceramic tools because they have suitable properties to withstand the tribological conditions imposed in the tool-chip-workpiece interface. This research aims to evaluate the performance of the PVD-TiAlN coated fine-grain cemented carbide tools in the turning of AISI 4340 with 55 HRC, considering different cutting conditions: continuous cutting; interrupted cutting; and adopting a machining strategy with recoil (woodpecker). Finishing hard turning experiments were performed with industrial cutting parameters applied in PCBN/ceramic tools. The tool wear progression was analyzed using focus variation microscopy (FVM) applying the volumetric wear parameter WRM (volume of removed material from the tool) and the traditional VBB according to ISO 3685:1993. In the three cutting condition tested, the tool collapses soon after the exposure of the substrate. Thus, the tool life limit should be the time of the coating layer deterioration. The volumetric wear parameter (WRM) is sensitive to identify and to calculate the wear rate over the coating layer. For the three cutting conditions applied, after the coating deterioration occurs a sudden modification of the tool geometry by a generation of the crater wear formed by the diffusion wear mechanism.
Keywords
Hard turning, coated cemented carbide tools, PVD coating, Tool life, Volumetric wear parameters
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