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Abstract
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Article Information:
Performance Study of Cryogenically Treated HSS Drills in Drillilg Gray Cast Iron Using Orthogonal Array Technique
B.R. Ramji, H.N. Narasimha Murthy, M. Krishna and M.J. Raghu
Corresponding Author: B.R. Ramji
Submitted: 2010 May, 27
Accepted: 2010 June, 15
Published: 2010 August, 01 |
Abstract:
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The objective of this research was to study the performance of cryogenically treated HSS drills for
drilling gray cast iron. Drilling experiments were conducted with cutting speeds: 560, 710, 900, 1120 rpm,
feeds: 0.05, 0.08, 0.12, 0.19 mm/rev and a constant drill diameter: 8 mm. The cryogenic treatment cycle
consisted of cooling the test samples from room temperature to cryogenic temperature of -178.9ºC in 3 h,
soaking at cryogenic temperature for 24 h and w arming to room temperature in about 5 h. The thrust force and
torque were measured using drill tool dynamometer. The surface roughness (Ra, Rz, Rq and R t) of the drilled
specimens were measured using talysurf. The experimental lay-out was designed using Taguchi’s Orthogonal
Array technique. Signal-to-Noise Ratio analysis was performed to identify the effect of the parameters on the
response variables. The treated drills were found superior to the non-treated in all the test conditions in terms
of lesser thrust force, torque and also superior surface roughness of the specimens. The tool wear was studied
using SEM.
Key words: Cryogenic, drilling, gray CI, surface roughness, Taguchi, ,
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Cite this Reference:
B.R. Ramji, H.N. Narasimha Murthy, M. Krishna and M.J. Raghu, . Performance Study of Cryogenically Treated HSS Drills in Drillilg Gray Cast Iron Using Orthogonal Array Technique. Research Journal of Applied Sciences, Engineering and Technology, (5): Page No: 487-491.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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