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Fundamental investigation on influence of external heat on chip formation during thermal assisted machining

Various heat sources have been investigated by numerous researchers to reveal machinability benefits of thermally assisted machining (TAM) process. Fewer engineering materials have been tested. In the same vein, those researches continue to demonstrate effective performance of TAM in terms of bulk m...

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Main Authors: Alkali, A.U., Ginta, T.L., Abdulrani, A.M., Elsiti, N.M.
Format: Article
Published: Institute of Physics Publishing 2018
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85046255490&doi=10.1088%2f1757-899X%2f344%2f1%2f012019&partnerID=40&md5=c76952db89701a2105d319bf7ab35edc
http://eprints.utp.edu.my/21610/
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spelling my.utp.eprints.216102018-10-23T01:32:15Z Fundamental investigation on influence of external heat on chip formation during thermal assisted machining Alkali, A.U. Ginta, T.L. Abdulrani, A.M. Elsiti, N.M. Various heat sources have been investigated by numerous researchers to reveal machinability benefits of thermally assisted machining (TAM) process. Fewer engineering materials have been tested. In the same vein, those researches continue to demonstrate effective performance of TAM in terms of bulk material removal rate, improved surface finish, prolong tool life and reduction of cutting forces among others. Experimental investigation on the strain-hardenability and flow stress of material removed with respect to increase in temperature in TAM has not been given attention in previous studies. This study investigated the pattern of chip morphology and segmentation giving close attention to influence of external heat source responsible for strain - hardenability of the material removed during TAM and dry machining at room temperature. Full immersion down cut milling was used throughout the machining conditions. Machining was conducted on AISI 316L using uncoated tungsten carbide end mill insert at varying cutting speeds (V) of 50, 79, and 100 m/min, and feed rates (f) of 0.15, 0.25, and 0.4 mm/tooth while the depth of cut was maintained at 0.2mm throughout the machining trials. The analyses of chip formation, segmentations and stain hardenability were carried out by using LMU light microscope, field emission microscopy and micro indentation. The study observed that build up edge is formed when a stagnation zone develops in front of tool tip which give rise to poor thermal gradient for conduction heat to be transferred within the bulk material during dry machining. This promotes varying strain - hardening of the material removed with evident high chips hardness and thickness, whereas TAM circumvents such impairment by softening the shear zone through local preheat. © Published under licence by IOP Publishing Ltd. Institute of Physics Publishing 2018 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85046255490&doi=10.1088%2f1757-899X%2f344%2f1%2f012019&partnerID=40&md5=c76952db89701a2105d319bf7ab35edc Alkali, A.U. and Ginta, T.L. and Abdulrani, A.M. and Elsiti, N.M. (2018) Fundamental investigation on influence of external heat on chip formation during thermal assisted machining. IOP Conference Series: Materials Science and Engineering, 344 (1). http://eprints.utp.edu.my/21610/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description Various heat sources have been investigated by numerous researchers to reveal machinability benefits of thermally assisted machining (TAM) process. Fewer engineering materials have been tested. In the same vein, those researches continue to demonstrate effective performance of TAM in terms of bulk material removal rate, improved surface finish, prolong tool life and reduction of cutting forces among others. Experimental investigation on the strain-hardenability and flow stress of material removed with respect to increase in temperature in TAM has not been given attention in previous studies. This study investigated the pattern of chip morphology and segmentation giving close attention to influence of external heat source responsible for strain - hardenability of the material removed during TAM and dry machining at room temperature. Full immersion down cut milling was used throughout the machining conditions. Machining was conducted on AISI 316L using uncoated tungsten carbide end mill insert at varying cutting speeds (V) of 50, 79, and 100 m/min, and feed rates (f) of 0.15, 0.25, and 0.4 mm/tooth while the depth of cut was maintained at 0.2mm throughout the machining trials. The analyses of chip formation, segmentations and stain hardenability were carried out by using LMU light microscope, field emission microscopy and micro indentation. The study observed that build up edge is formed when a stagnation zone develops in front of tool tip which give rise to poor thermal gradient for conduction heat to be transferred within the bulk material during dry machining. This promotes varying strain - hardening of the material removed with evident high chips hardness and thickness, whereas TAM circumvents such impairment by softening the shear zone through local preheat. © Published under licence by IOP Publishing Ltd.
format Article
author Alkali, A.U.
Ginta, T.L.
Abdulrani, A.M.
Elsiti, N.M.
spellingShingle Alkali, A.U.
Ginta, T.L.
Abdulrani, A.M.
Elsiti, N.M.
Fundamental investigation on influence of external heat on chip formation during thermal assisted machining
author_facet Alkali, A.U.
Ginta, T.L.
Abdulrani, A.M.
Elsiti, N.M.
author_sort Alkali, A.U.
title Fundamental investigation on influence of external heat on chip formation during thermal assisted machining
title_short Fundamental investigation on influence of external heat on chip formation during thermal assisted machining
title_full Fundamental investigation on influence of external heat on chip formation during thermal assisted machining
title_fullStr Fundamental investigation on influence of external heat on chip formation during thermal assisted machining
title_full_unstemmed Fundamental investigation on influence of external heat on chip formation during thermal assisted machining
title_sort fundamental investigation on influence of external heat on chip formation during thermal assisted machining
publisher Institute of Physics Publishing
publishDate 2018
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85046255490&doi=10.1088%2f1757-899X%2f344%2f1%2f012019&partnerID=40&md5=c76952db89701a2105d319bf7ab35edc
http://eprints.utp.edu.my/21610/
_version_ 1738656313547685888
score 13.211869

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