CUTTING TOOL

PURPOSE:To make the size of a rigid sintered body small by forming a seat surface of a recess part on the main body side where the bottom surface of the sintered body is to be attached to protrude having a level difference along the feed direction of a tool toward a rake face of the tool. CONSTITUTION:A small rigid sintered body consisting of a rigid sintered body 1 and a base 2 fixed to it is installed to a recess part 6 provided to be suitable to the corner part of a tool main body 5 by brazing a bottom surface 3 with a back surface 4. The seat surface of the recess part 6, that is the surface where the bottom surface 4 is to be attached, is of an inverse V-letter shape formed of two planes crossing with each other at the center by an angle of theta. For cutting a quenched blade, among a main component force Fc, a feed component force Ft, and a back component force Fo, the back component force Fo is the biggest, and the feed component force Ft is the smallest for the main component force Fc. In this case, the main component force Fc pushes the sintered body 1 which floats to the rake face side back to the seat surface side by the feed component force Ft. Fc is generally larger than Ft, so a necessity to be durable to the feed component force by the attachment force is almost eliminated, and the durability to the feed component force is very strong.