CUTTING TIP REPLACEMENT TYPE ROTARY TOOL

摘要

An indexable milling cutter is provided which is capable of achieving a reduction in cutting resistance while maintaining chipping resistance of a main cutting edge formed in an insert and suitable for highly efficient high-feed processing. It is an indexable milling cutter including an insert attached thereto which can be attached to and detached from a cutter body and which has a polygonal plate or round shape as seen in a plan view. In this insert, a negative honing and a land are provided on a rake face of a main cutting edge, and a rounded corner cutting edge is formed at a corner portion. Moreover, it is an indexable milling cutter which achieves a reduction in cutting resistance while maintaining the chipping resistance of the main cutting edge by making the main cutting edge of the insert have a lowermost point with respect to a rotation axis direction of the cutter body when the insert is attached to the cutter body and by forming the width of the negative honing or the widths of the negative honing and the land so as to gradually increase from the lowermost point toward an outer periphery side direction with respect to the rotation axis direction of the cutter body.