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

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).

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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.

Item Type:Article
Impact Factor:cited By 0; Conference of 3rd International Conference on Science, Technology, and Interdisciplinary Research, IC-STAR 2017 ; Conference Date: 18 September 2017 Through 20 September 2017; Conference Code:135947
Uncontrolled Keywords:Carbide cutting tools; Cutting; Integrated circuits; Materials handling equipment; Stars; Strain hardening; Tungsten carbide, Chip morphologies; Down-cut millings; Effective performance; Engineering materials; Experimental investigations; Field emission microscopy; Machining conditions; Micro indentation, Cutting tools
Departments / MOR / COE:Research Institutes > Institute for Health Analytics
ID Code:21610
Deposited By: Ahmad Suhairi
Deposited On:25 Sep 2018 00:46
Last Modified:23 Oct 2018 01:32

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