ROTATING-CUTTING-EDGE-TYPE MILLING TOOL AND CUTTING METHOD USING SAME

摘要

A virtual plane obtained by a locus when a tangent line, which passes through a tool distal end edge, of a virtual circle formed when a tool distal end edge of a cutting edge is rotated in a tool circumferential direction is moved parallel to a tool axial line is a reference plane, an angle (ARt) at which a cross line of the reference plane and the cutting edge virtual plane, is inclined with respect to the tool axial line projected onto the reference plane, is in a range of −30 degrees to −60 degrees, an angle (RR) at which a cutting edge tangent line which passes through the tool distal end edge and extends outward in a tool radial direction, is inclined with respect to a predetermined tool radial direction, which passes through the tool distal end edge, is in a range of −30 degrees to −75 degrees.

主权项

1. A rotating-cutting-edge-type milling tool comprising:
a tool main body which is rotated around a tool axial line; an insert attachment seat formed at an outer periphery portion of a distal end of the tool main body; and a cutting insert formed a discoid shape is rotatably around an insert axial line thereof, mounted on the insert attachment seat, the cutting insert including: front and rear surfaces which intersect the insert axial line; an outer periphery surface which connects circumferential edges of the front and rear surfaces; and a cutting edge formed a circular shape extending around the insert axial line, which is formed a circumferential edge of the front surface, wherein among the front and rear surfaces, the front surface is located to face forward in a tool rotation direction around the tool axial line, and the rear surface is located to face rearward in the tool rotation direction and sits on the insert attachment seat, a circle obtained by a locus when a tool distal end edge in the tool axial line direction on the cutting edge, is rotated a tool circumferential direction of around the tool axial line, is a virtual circle, a virtual plane obtained by a locus when a tangent line of the virtual circle which passes through the tool distal end edge, is moved parallel to the tool axial line toward a tool posterior end from the tool distal end edge, is a reference plane, an angle (ARt) at which a cross line of the reference plane and a cutting edge virtual plane including the cutting edge, is inclined with respect to the tool axial line projected onto the reference plane, is in a range of −30 degrees to −60 degrees, and an angle (RR) at which a cutting edge tangent line of the cutting edge which passes through the tool distal end edge and extends outward in a tool radial direction which is orthogonal to the tool axial line, is inclined with respect to a predetermined tool radial direction among the tool radial directions which passes through the tool distal end edge, is in a range of −30 degrees to −75 degrees or is in a range of −20 degrees to 30 degrees.