Roughing end mill and roughing end mill

Abstract

This roughing end mill is provided with an end mill body which is rotated around an axis, and with a plurality of inserts which are placed on an outer circumference of the end mill body at a predetermined distance apart from each other in the direction of the axis. The plurality of inserts form insert rows of which a plurality are provided in a circumferential direction of the end mill body, and at least the inserts included in a group are positioned so as to be offset in the axial direction from each other in the different insert rows which are mutually adjacent in the circumferential direction. The inserts included in the group are provided with cutting edges which face towards an outer circumferential side of the end mill body and which are formed as waveform cutting edges which undulate as they move in the axial direction. One insert of one insert row of the inserts included in the group and an insert of another insert row which is offset therefrom in the axial direction among the inserts included in the group are positioned such that the waveform cutting edges of each of these inserts make up a waveform cutting edge row whose phase is continuous on a rotation trajectory around the axis. A plurality of these waveform cutting edge rows which have mutually different phases are formed on the outer circumference of the end mill body.

Description

technical field [0001] The present invention relates to a roughing insert provided with a wave-shaped cutting edge for rough machining a workpiece, and an insert detachable roughing end mill having such a roughing insert attached to the outer periphery of an end mill body . [0002] This application claims the priority of Japanese Patent Application No. 2006-248174 filed on September 13, 2006, and Japanese Patent Application No. 2006-295907 filed on October 31, 2006, and the contents thereof are cited here. Background technique [0003] As such a detachable insert-type roughing end mill, for example, Patent Documents 1 and 2 propose a technology in which a plurality of helical grooves are formed on the outer periphery of a cylindrical tool body and spaced in these helical grooves. The blades in the shape of a quadrangular flat plate are attached with a small gap, and the blades of different helical grooves are arranged at approximately equal intervals so as to complement th...

AI Technical Summary

Problems solved by technology

[0010] Therefore, in this case, as an insert mounted on the top end of the end mill body, an insert with two short cutting edges is required, and the tip side portion of the wave-shaped cutting edge has the same shape and rear end. There are two types of inserts with long cutting edge lengths of different shapes that do not coincide with each other on the side parts, and there are three types of inserts in total. However, these two types of inserts with long cutting edge lengths are similar in shape to each other, so there is a possibility that the same insert is installed incorrectly. The problem

And, when such a mounting error occurs and the rotation trajectory of the wave-shaped cutting edge coincides at the part of the rear end side of the insert with a long cutting edge length, the wave-shaped cutting edge will turn to the processing surface of the workpiece as described above. Even though it is rough machining, it forms a machined surface with large unevenness, and the surface roughness is significantly deteriorated. In the subsequent finishing machining, it is necessary to increase the amount of finishing machining, and it also damages the reduction of cutting force and chip handling.

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