Cutting tool for boring

摘要

A cutting tool for boring including a cutting insert fixed at a front end of a bar-shaped holder. The holder includes a cutting surface-sided chip pocket that is concave with respect to the outer circumferential surface of the holder, the cutting edge end of the cutting insert protruding from the outer circumferential surface of the holder, and the cutting surface-sided chip pocket having a bottom surface facing the portion of outer circumferential surface where the cutting edge overhangs. Further, an cutting edge-sided chip pocket is formed at the portion of outer circumferential surface where the cutting edge overhangs such that the edge of the portion of outer circumferential surface where the cutting edge overhangs is concave with respect to the outer circumferential surface of the holder, on the bottom of the cutting surface-sided chip pocket when viewed from the cutting surface.

主权项

1. A cutting tool for boring, comprising:
a bar-shaped holder having a front end and a rear end; and a cutting insert fixed at a front end of the holder, the cutting insert having an upper cutting surface and a cutting edge which overhangs from an outer circumferential surface of the holder, wherein the holder includes:
a cutting surface-sided chip pocket that is concave with respect to the outer circumferential surface of the holder and comes into contact with a rear end of a cutting surface of the cutting insert, the cutting surface-sided chip pocket configured to open to a portion of the outer circumferential surface where the cutting edge overhangs, the cutting surface-sided chip pocket having a bottom surface that faces the same direction as a portion of the outer circumferential surface where the cutting edge overhangs, and wherein a cutting edge-sided chip pocket that is concave with respect to the outer circumferential surface of the holder and having a bottom surface which intersects with the bottom surface of the cutting surface-sided chip pocket is formed at a rear end portion of the outer circumferential surface where the cutting edge overhangs, wherein, as the bottom surface of the cutting surface-sided chip pocket extends toward the rear end of the holder, the bottom surface of the cutting surface-sided chip pocket extends toward the portion of the outer circumferential surface where the cutting edge overhangs, such that when viewed from the upper cutting surface, a depth of the cutting surface-sided chip pocket from an edge of the portion of the outer circumferential surface where the cutting edge overhangs decreases toward the rear end of the cutting surface-sided chip pocket, wherein the cutting edge-sided chip pocket is at or below the cutting surface-sided chip pocket at each of lines perpendicular to an axial line of the holder where the cutting surface-sided chip pocket is formed when viewed from a side of the cutting tool for boring, and wherein the cutting edge-sided chip pocket does not rise above the cutting surface-sided chip pocket when viewed from the side of the cutting tool for boring.