Rotary cutting tool

摘要

To provide a rotary cutting tool in which a satisfactory cut state in which burrs and uncut portions are absent is obtained, even when counterboring is applied to a composite honeycomb member. A first cutting-chip discharge groove (2) disposed from a tool tip towards a base-end side is formed on an outer periphery of a tool body (1); a plurality of second cutting-chip discharge grooves (3), provided along a spiral disposed from the tool tip towards the base-end side so as to intersect with the first cutting-chip discharge groove (2), are formed on an outer periphery section of the tool body (1) where the first cutting-chip discharge groove (2) is absent; and a base-end-side outer periphery cutting edge (4) is formed on an intersection ridge between a rake face of a second cutting-chip discharge groove (3), which faces a direction of tool rotation, and an outer peripheral surface of the tool body (1) or an outer peripheral relief face; wherein an end cutting edge (5) is provided at a tip section of the tool body (1); a tip-side outer periphery cutting edge (6) is formed on an intersection ridge between the rake face at a tip section of a first cutting-chip discharge groove (2) and an outer peripheral surface of the tip section of the tool body (1) or an outer periphery relief face (18); and the base-end-side outer periphery cutting edge (4) is provided further towards the tool base-end side than the tip-side outer periphery cutting edge (6).

主权项

1. A rotary cutting tool in which: a first cutting-chip discharge groove disposed from a tool tip towards a base-end side is formed on an outer periphery of a tool body; a plurality of second cutting-chip discharge grooves, provided along a spiral disposed from the tool tip towards the base-end side so as to intersect with the first cutting-chip discharge groove, are formed on an outer periphery section of the tool body where the first cutting-chip discharge groove is absent; a base-end-side outer periphery cutting edge is formed on an intersection ridge between a rake face of a second cutting-chip discharge groove, which faces a direction of tool rotation, and an outer peripheral surface of the tool body or an outer peripheral relief face formed on the outer periphery of the tool body; wherein an end cutting edge is provided at a tip section of the tool body; a tip-side outer periphery cutting edge is formed on an intersection ridge between the rake face at a tip section of the first cutting-chip discharge groove and an outer peripheral surface of the tip of the tool body or an outer periphery relief face formed on an outer periphery of the tip of the tool body; and the base-end-side outer periphery cutting edge is provided further towards the tool base-end side than the tip-side outer periphery cutting edge.