The drill method null of using the drill and the said drill for the difficult work timber

摘要

PURPOSE: To provide a drill suitable for drilling inorganic material such as ceramics or a material of hard machinability and an efficient drilling method. ;CONSTITUTION: A drill where a tip supporting surface 2 in the rear axial direction of a tip 1 is machined flat or in the successivelydeposited manner, and a super-hard material S such as diamond is fixed on the tip 1 and the tip supporting surface 2 is used to execute the drilling by repeating the control of the fluctuation of the applied pressure and the release of the applied pressure to a work.;COPYRIGHT: (C)1994,JPO