Abstract
In order to assess effect of surface roughness and other tribo-parametrs under a set of known lubricant on a coefficient of friction, tribological tests were performed using pin-on-disc set-up. A tribo-pair of AISI 1010 low carbon steel pin sliding against EN31 disc were selected for experimentation. Taguchi’s L27 orthogonal array has enabled to analyze successfully the effect of surface roughness, sliding speed and pressure on coefficient of friction. Based on the signal to noise proportion, grading of the factors has been done. Coefficient of friction ranges between 0.02 and 0.3 for an optimum regime of working under marginally lubricated sliding contacts. In order to establish lubrication mode, the ‘Stribeck curve’ were plotted in terms of parameters ην/p verses coefficient of friction with different surface integrities under lubricated sliding. This information would facilitate selection of suitable parameters and maintain the lube oil viscosity in order to achieve an optimum mode of lubrication in the light of ‘Stribeck Curve’. In the present work few parameters were taken into consideration, however; detail research involving operational parameters, material properties and structural variables to determine ‘Stribeck Curve’ in realistic range of surface roughness can be undertaken for a specific operation.
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