Replaceable tool edge rotary cutting tool and insert

Abstract

In a virtual plane (VS): the angle at which the cutting face (14) of a corner-rounded cutting edge (13) is inclined with respect to a reference plane (Pr) is defined as the radial direction rake angle(Delta), the angle at which a virtual line (VL) projected on the reference plane (Pr) is inclined with respect to the rotation center axis is defined as the radiation angle (Theta), and the point atwhich the virtual line (VL) with a radiation angle (Theta) of 5 degrees intersects the corner-rounded cutting edge (13) is defined as the reference point (RP); the twist angle of an outer circumferential cutting edge (9) has a positive value; the axial direction rake angle (Ar1) of the corner-rounded cutting edge (13) at a boundary point (Q) has a positive value; the axial direction rake angle (Ar2) of the corner-rounded cutting edge (13) at the reference point (RP) has a negative value; of the entire edge length of the corner-rounded cutting edge (13), the radial direction rake angle (Delta)at least in the region between the boundary point (Q) and the reference point (RP) has a negative value; and the radial direction rake angle (Delta) is smaller at the reference point (RP) than at theboundary point (Q).

Description

technical field [0001] The present invention relates to an indexable insert type rotary cutting tool and an insert equipped with a cutting insert suitable for front cutting (flat machining) or side rough machining of a workpiece. [0002] This application claims priority based on Patent Application No. 2016-025175 for which it applied in Japan on February 12, 2016, and uses the content here. Background technique [0003] Conventionally, for example, when performing front cutting or side rough machining on a workpiece such as a mold, for example, a solid arc end mill as described in Patent Document 1 below has been used. [0004] In addition, as an indexable insert type arcuate end mill, the following structure is known: the structure of this arcuate end mill includes: a columnar tool holder body that rotates around the rotation center axis; and an insert that can It is detachably attached to a slit formed in the tool holder body, and the cutting edge portion protrudes from ...

AI Technical Summary

Problems solved by technology

[0010] For such cutting conditions or workpieces, when cutting, the plane of the workpiece (such as the bottom surface of the recess for deep digging of the mold of the workpiece, etc.) Near the bottom cutting edge of the machining, it is easy to pull the tool tip (arbitrary cutting) in the way of drilling into the workpiece when cutting into the workpiece

If the cutting edge cuts randomly, chipping or high-frequency chatter is likely to occur

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