Effect of Cryogenic Cooling on Surface Integrity in  Turning of Hard Alloy Steel

Suha K. Shihaba; Zahid A. Khan; Aas Mohammad; Arshad Noor Siddiquee

Volume : III, Issue : VII, July - 2013

Effect of Cryogenic Cooling on Surface Integrity in Turning of Hard Alloy Steel

Suha K. Shihaba, Zahid A. Khan, Aas Mohammad, Arshad Noor Siddiquee

Abstract :

Surface roughness and micro–hardness which are the constituents of surface integrity (SI) of the machined components generally get affected by cutting parameters such as the cutting speed, the feed rate, the depth of cut, etc. This paper presents a study that investigates the effect of the CNC hard turning parameters on the surface roughness average (Ra) and the micro–hardness (µh) of hard steel (AISI 52100) under cryogenic cooling conditions. Nine experimental runs based on an orthogonal array of Taguchi method are performed and grey relational analysis method is then applied to determine an optimal combination of the cutting parameter setting. Further, the Grey relational grade matrix obtained by analyzing the data is used to represent the degree of influence for each controllable process factor onto individual quality targets. From the results, the feed rate is found to have the most influence on the roughness average and also on the micro–hardness. In addition, the analysis of variance (ANOVA) is also employed to identify the most significant factor; the cutting speed is the most significant controlled factors for affecting the SI in the cryogenically cooled turning operations according to the weighted sum grade of the surface roughness average and micro–hardness.