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Experimental and analytical analyses of the cutting processin the deep hole drilling with BTA (Boring Trepanning Association) system

Published online by Cambridge University Press:  14 February 2014

J. Thil ,
B. Haddag ,
M. Nouari ,
C. Barlier  and
L. Papillon
J. Thil
Affiliation:
Université de Lorraine, Laboratoire d’Energétique et de Mécanique Théorique et Appliquée, LEMTA CNRS-UMR 7563, GIP-InSIC, 27 rue d’Hellieule, 88100 Saint-Dié-des-Vosges, France CIRTES, Centre Européen de Prototypage et Outillage Rapide, 29 bis rue d’Hellieule, 88100 Saint-Dié-des-Vosges, France
B. Haddag
Affiliation:
Université de Lorraine, Laboratoire d’Energétique et de Mécanique Théorique et Appliquée, LEMTA CNRS-UMR 7563, GIP-InSIC, 27 rue d’Hellieule, 88100 Saint-Dié-des-Vosges, France
M. Nouari*
Affiliation:
Université de Lorraine, Laboratoire d’Energétique et de Mécanique Théorique et Appliquée, LEMTA CNRS-UMR 7563, GIP-InSIC, 27 rue d’Hellieule, 88100 Saint-Dié-des-Vosges, France
C. Barlier
Affiliation:
Université de Lorraine, Laboratoire d’Energétique et de Mécanique Théorique et Appliquée, LEMTA CNRS-UMR 7563, GIP-InSIC, 27 rue d’Hellieule, 88100 Saint-Dié-des-Vosges, France CIRTES, Centre Européen de Prototypage et Outillage Rapide, 29 bis rue d’Hellieule, 88100 Saint-Dié-des-Vosges, France
L. Papillon
Affiliation:
AREVA NP, Usine de Chalon Saint-Marcel, 71380 Saint-Marcel, France
*
a Corresponding author: badis.haddag@univ-lorraine.fr; mohammed.nouari@univ-lorraine.fr

Abstract

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This paper deals with analysis of the cutting process, on a macro and micro scale, in the deep hole drilling with BTA system. An experimental procedure is developed to highlight the impact of cutting speed and feed rate on the cutting process when machining the 18MND5 steel. Parameters based on dimensional characteristics of chips are introduced to quantify the morphology of chips generated by central, intermediate and external inserts of the complex BTA drilling tool. From observation of the chips morphology (flat, curved and spiral) and the measurement of the chips width, the provenance of each chip with respect to cutting inserts is identified. Then, the Chip Compression Ratio is evaluated for each cutting condition, indicating the amount of plastic strain in chips. Thanks to the introduction of a new parameter, denoted as Chip Fragmentation Ratio, it is found that the cutting speed has a little influence, compared to the feed rate, on the chips size. Based on this quantitative analysis, the optimal range of cutting conditions for the BTA deep hole drilling is discussed. It is mentioned that although increasing the feed rate promotes the chips fragmentation and increases the material removal rate (increasing productivity), an upper limit is to determine to prevent excessive flank wear. Also, the cutting speed should be limited to avoid excessive crater wear.

Keywords

BTA deep drillingcutting testschips characterisationquantitative analysischip fragmentationoptimal cutting conditions
Type
Research Article
Information
Mechanics & Industry , Volume 14 , Issue 6 , 2013 , pp. 413 - 429
Copyright
© AFM, EDP Sciences 2014

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