Prediction of te Effect of Gash Rake Angle on Thrust Force and Drilling Moment by Fuzzy Logic

During drilling of AISI 4140 tempering steel with different gash rake angle, the effects of the gash rake angle on the thrust force and drilling moment, which are called cutting loads, were predicted by fuzzy logic. The data from monolithic solid carbide drill were used that has +10°, 0°, -10° gash angle and diameter with 6,8 mm in the experiments, which published previously. According to the experimental study, the gash rake angle and the feed amount are the most effective parameters on the thrust force and the drilling moment. A limited number of experimental studies were conducted to determine the relationship between drilling parameters and cutting loads. However, obtaining the mathematical model that gives the thrust force and the drilling moment values with respect to the gash rake angle and the feed amount is difficult to define with high accuracy. Proposed fuzzy model consists of two input variables and two output variables. The fuzzy model was constituted with the gash rake angle and the feed amount as independent parameters for the thrust force and the drilling moment. The results showed that the proposed fuzzy model represented experimental results with high confidence.