Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.procir.2014.03.016
Title: The Effects of Tool Degradation on Hole Straightness in Deep Hole Gundrilling of Inconel-718
Authors: Woon, KS 
Chaudhari, A 
Kumar, A Senthil 
Rahman, M 
Keywords: Science & Technology
Technology
Engineering, Industrial
Engineering
Deep hole drilling
Tool wear
Hole straightness
WEAR
Issue Date: 1-Jan-2014
Publisher: ELSEVIER SCIENCE BV
Citation: Woon, KS, Chaudhari, A, Kumar, A Senthil, Rahman, M (2014-01-01). The Effects of Tool Degradation on Hole Straightness in Deep Hole Gundrilling of Inconel-718. 6TH CIRP INTERNATIONAL CONFERENCE ON HIGH PERFORMANCE CUTTING (HPC2014) 14 : 593-598. ScholarBank@NUS Repository. https://doi.org/10.1016/j.procir.2014.03.016
Abstract: Straightness control in deep hole gundrilling of Inconel-718 is challenging. In this study, the drills are found to degrade rapidly on the cutting edges, bearing pads and side margins, largely due to the extreme heat resistivity of the high temperature superalloys. Severe adhesive wear developed on the rake and flank faces deteriorates cutting efficiencies of the cutting edges while diffusive wear on the bearing pads and side margins deteriorates self-piloting efficacies of the drill. Coupled with highly irregular wear rates on the inner and outer cutting edges, the drills are forced against the hole at high rotational speeds - leading to escalations in frictional contact, heating and thermal damage on the bearing pads and side margins. As a consequence, the drills are deflected from the designated drilling course and resulted in straightness deviation on the part of hole drilled. Through the accumulation of partial straightness deviation over the course of high aspect ratio drilling, the final hole produced is deflected in a constant trend as governed by the rate and behaviour of tool degradation. © 2014 Published by Elsevier B.V.
Source Title: 6TH CIRP INTERNATIONAL CONFERENCE ON HIGH PERFORMANCE CUTTING (HPC2014)
URI: https://scholarbank.nus.edu.sg/handle/10635/155423
ISSN: 2212-8271
2212-8271
DOI: 10.1016/j.procir.2014.03.016
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