Cutting Tool with Curved Rake Face - A Means for Breaking Thin Chips

Summary Thin chips produced in finish turning, facing and fine boring are very hard to be broken because of their flexibility, and cause trouble in chip control. At present, this is the largest barrier to the spread of unmanned machine tool operation. In this paper, this trouble is shown to be avoided when the chip is given a curved section. For this purpose, cutting tools with various types of curved rake face are tested. A double spherical pit on the rake face is found to be very effective for the chip breaking without sacrificing tool life.