On the effect of cutting fluid on drilling aluminum alloy

Abstract

Several sorts of cutting fluids having various viscosities were used in drilling of aluminum alloys and their effects on drilling resistance, drilling temperature, drilling accuracy, state of drilled surface, disposal of chips, etc. were discussed. Since the reproducibility in supplying the fluid was not reliable, the drilling tests were conducted by dipping the whole specimen in the fluid. The results were summarized as follows.Nose angle of 118° and lip clearance of 12° were effective in drilling of aluminum alloys with cutting fluids when the effects on drilling temperature and roughness of drilled surface were taken into consideration. Among some kinds of drilling resistance, the viscosity of the liquid had little effects on torque; but the effects on thrust and drilling time were more powerful than those in dry drilling. (These values were higher than those in dry drilling). However, high viscous fluids were more effective, because they gave the lower values than those in dry drilling. When cutting speed was low, the drilling temperature was lower than that in dry drilling. The roughness of drilled surface was finished better than that in dry drilling, and also better effects were given on the disposal of chips, appearance of burrs at the outlet of hole, etc. However, no remarkable effects were found on the enlargement of hole diameter.