experimental study of the effect of rotational speed, feed rate, lubricant and tool material in friction drilling of the titanium sheets

In this research, the effects of the rotational speed, feed rate, tool material and lubricants on the tool life and the hole quality are studied in the frictional drilling of the titanium sheets. the friction drilling tests are performed on a cnc milling machine. furthermore, 5 specimens are selected and their metallurgical structures are studied. the results show thatamong the input parameters, the rotational speed and feed rate significantly alter the output parameters.furthermore,the results showed that the best hole quality can be achieved using a wc tool material along with appropriate lubricant. the tool geometry is also an important factor that can excel the produced hole quality and increase the tool life. the metallurgical results also showed that because of the severe plastic deformation of the layers close to the hole surface, the hardness of these layers is higher than that of the other regions in the workpiece.