Machining
Jayasimha SLN; Ganapathy Bawge; Raju H.P.
Abstract
Traditional methods of finishing like grinding, lapping and honing are limited to finishing of vital shape such as flat and circular. These conventional methods are lagging for processing components that are fabricated by hard materials involving complicated profiles in particular. Hence, it is essential ...
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Traditional methods of finishing like grinding, lapping and honing are limited to finishing of vital shape such as flat and circular. These conventional methods are lagging for processing components that are fabricated by hard materials involving complicated profiles in particular. Hence, it is essential to explore a finishing process which address wide applications, better accuracy, efficient, consistent quality and economy in finishing complex shaped parts. So, a new precision finishing process like extrusion honing has been implemented for polishing from several microns to nano level. The aim of the work is to assess the influence of number of abrasive media passes on surface integrity of aluminium, copper and titanium grade-2 materials. The study has been performed by adopting abrasive 36 mesh size with concentration 40 % followed by 10 abrasive media passes. The influence of these process parameters has been studied in analyzing the roughness characteristics Ra, Rmax, Rz and Rmax/Ra and the nature of surface induced by SEM characterization for the metals of consideration using extrusion honing process.
Machining
Pawan Kumar; Meenu Gupta; Vineet Kunar
Abstract
The present research attempts to analyze the surface topography of WEDMed Inconel 825 concerning surface crack density (SCDi) and recast layer thickness (RCLt). Formation of cracks, recast layer, and heat-affected zone are the major issues in determining the final performance of the WEDM machined sample. ...
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The present research attempts to analyze the surface topography of WEDMed Inconel 825 concerning surface crack density (SCDi) and recast layer thickness (RCLt). Formation of cracks, recast layer, and heat-affected zone are the major issues in determining the final performance of the WEDM machined sample. In this study, WEDM characteristics viz. pulse on time (Ton), pulse off time (Toff), gap voltage (SV), peak current (IP), wire tension (WT), and wire feed (WF) are optimized for the response SCDi and RCLt by response surface methodology. The outcome manifests that the topography of the machined surface becomes more rougher at the increased value of Ton, IP, and SV. RSM emerges as a great tool in the development of a predicted model based on the desirability approach and finding optimal parametric combinationm which results in reduced SCDi and RCLt. At the optimum combination of process parameters, i.e., 109 machine unit Ton, 36 machine unit Toff, 54 V SV, 120A IP, 9 machine unit WT and 7 m/min WF, the values obtained for SCDi and RCLt are 0.00160 μm/μm2 and 20.991μm, respectively with an error of less than 5%.
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