THE INFLUENCE OF SOME FACTORS ON SURFACE FINISH AND GRINDING WHEEL WEAR IN DRY SURFACE GRINDING.

Workpiece of EN-8 plain carbon steel have been dry surface ground using Alumina grit,vitreous bonded wheels(WA 46 HV) under constant metal removal rate.The effect of the crossfeed and the downfeed in addition to the workpiece speed on the surface finish of the ground workpiece,and the wheel wear have been investigated. Empirical formulae have been derived, by which the grinding ratio,and the surface finish of the ground surfaces have been expressed in terms of the grinding parameters.
Basically,three series of tests were performed.Each series was performed with on of the above parameters,and the product of the other two parameters fixed. Firstly, the workpiece speed was fixed at 43.2 mm/sec. and the product of the downfeed and the crossfeed was fixed at .032 mm4. Secondly, the downfeed was fixed at 0.05 mm. and the pr9duct of the workpiece speed and crossfeed was fixed at 27 mm / sec. Thirdly,the crossfeed was fixed at 0.625 mm. and the product of the downfeed and the workpiece speed was fixed at 2.16 mm2/sec.
It has been found that the grinding ratio and the workpiece surface roughness are both affected by the grinding conditions in the following order of significance: crossfeed,workpiece speed and downfeed. It has also been found that the grinding ratio increase is always accompanied by a decrease in the surface roughness of the ground workpiece.