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STUDY OF WC-Co TOOL WEAR MECHANISMS BY THE TOOL-CHIP INTERFACE CHARACTERISATION- APPLICATION TO THE DRY MACHINING OF THE AERONAUTIC ALUMINIUM ALLOY AA2024 T351

Gautier List
Abstract : In the present study, carbide tool wear is analysed in the case of dry machining of an aeronautic aluminium alloy (AA2024 T351). The purpose is to determine the different tribological parameters at the tool-chip interface (friction, temperature, pressure) and to confront them with the wear mechanisms. A modelling of the contact between the chip and the tool, based on the viscoplastic properties of the material flow, is initially proposed. This allows to establish relationships existing between the chip geometry (shear angle), the stress applied on the tool, the friction coefficient and the sliding chip velocity in the neighbourhood of the cutting tool edge. The analytical model is then used to determine the nature of the contact (sticking, sliding) and to calculate the sliding speed. To determine the temperature and the contact pressure, a special device based on the experimental observation of the chip formation (high speed video camera, force measurement, heat flux calculation) and the finite element numerical simulation is also carried out. The surface analysis carried out using complementary techniques (MEB, EDS, AES, optical profilometry) allowed to clearly identify the different wear mechanisms. They result in the formation of built-up edges, in the formation of adherent layers (transfer layers formed by extrusion of precipitates) and in the tool embrittlement caused by the diffusion of chemical species from the chip towards the tool. Thanks to the study, it is possible to connect these various damage modes to the contact conditions existing at the tool-chip interface.
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https://pastel.archives-ouvertes.fr/pastel-00001178
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Thursday, April 7, 2005 - 8:00:00 AM
Last modification on : Thursday, April 7, 2005 - 8:00:00 AM
Long-term archiving on: : Saturday, November 26, 2016 - 4:09:19 PM

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Gautier List. STUDY OF WC-Co TOOL WEAR MECHANISMS BY THE TOOL-CHIP INTERFACE CHARACTERISATION- APPLICATION TO THE DRY MACHINING OF THE AERONAUTIC ALUMINIUM ALLOY AA2024 T351. Engineering Sciences [physics]. Arts et Métiers ParisTech, 2004. English. ⟨NNT : 2004ENAM0041⟩. ⟨pastel-00001178⟩

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