A COMPARATIVE-STUDY OF THE EFFECT OF TOOL GEOMETRY WITH NEGATIVE SCEAS ON MACHINING PARAMETERS

The objective of this research was to use analytical and experimental approaches to investigate the effects of cutting tool geometry with a negative side cutting edge angle (SCEA) on machining parameters. The f irst task of this research was to conduct experimental tests for diffe rent SCEAs, cutting speeds, feed rates and depths of cut. The second t ask was to develop a mathematical model to predict cutting forces for the three-dimensional oblique cutting operation. These tasks were acco mplished as follows. One set of the experimental results was used as f eedback to develop new empirical formulae required to predict cutting forces. A second set of experimental tests was conducted in this study to ensure the validity of the empirical relationships associated with the mathematical model. A comparison of cutting forces and other mach ining parameters was made between the output of the mathematical model and the experimentally-measured values. New cutting tools are propose d by using the results of the expanded mathematical model. The benefit s of this research are as follows: a model for an oblique cutting oper ation as a function of SCEAs, cutting speeds, feed rates and depths of cut was developed; the effect of negative SCEAs on machining paramete rs in an oblique cutting process was investigated; and a new direction for designing cutting tool geometry with negative SCEAs, which improv es the quality of surface finish and productivity of cutting tool life in turning operations was developed.