An end mill has a shank section and a cutting section connected thereto. The cutting section includes a core supporting at least two spaced apart teeth that have a cutting edge extending in the axial direction with respect to the axis of rotation of the end mill. Each cutting edge has a flute associated therewith and each flute has, for each cross-section of the end mill perpendicular to the axis of rotation thereof, a bottom point on the core at a shortest distance to the axis of rotation. At least two flutes have a shortest distance that varies differently with the distance to a cutting end of the end mill.

The invention relates to a method for producing a roughing tool (1), particularly a circular milling tool, comprising the following steps: fitting a lateral surface of a tool base body (10) that can be rotatably driven about an axis of rotation (2) with a number of cutting element blanks (20) that are staggered in the axial and/or peripheral direction, such that a free edge of each cutting element blank (20) protrudes out of the lateral surface in the mounted state; inserting a microtoothing comprising a plurality of axially spaced cutting teeth (21) into the respective free edges of the cutting element blanks (20) by a material removal method, preferably by thermal machining, particularly preferably by eroding, in the premounted state on the tool base body (10). The invention further relates to a roughing tool produced by means of such a method.

A reusing method of an end mill involves machining a base material of an end mill in advance so as to have coaxiality equal accuracy to coaxiality for a cutting part, and when the cutting part is worn out, cutting off of the cutting part and machining a new cutting part on a shank part while a part of outer peripheral surface of the shank part is left as margin without cutting. The new cutting part has accuracy of coaxiality and an outer diameter identical to those of the cutting part.

A rotary tool according to a non-limiting aspect includes a body having a rotation axis and extending from a first end to a second end. The body including: a first part including the first end; a second part located closer to a second end than the first part and having a larger outside diameter than the first part; a cutting edge located at a side of the first end; a ridge portion located in the first part and the second part, connected to the cutting edge and helically extending from the cutting edge toward the second end; and a flute located along the ridge portion. The flute includes: a first flute located at the first part and having a first helix angle; and a second flute located at the second part and having a second helix angle. The second helix angle is smaller than the first helix angle.

An end mill for shouldering and/or slotting applications includes at least one tooth including a cutting edge. The cutting edge includes a first sub-edge extending rearwardly from a cutting end face and a second sub-edge extending rearwardly from the first sub-edge. An angle transition intersection defines where the first sub-edge ends and the second sub-edge starts. The angle transition intersection is located generally between 20% to 75% of an effective cutting length from a cutting end face and more specifically at a location within the general location where there is an increase in the rake angle and/or a significant increase in the helix angle of the cutting edge.

A cutting tool may have a columnar shape extended along a rotation axis from a first end toward a second end, and may include a holder, a first insert and a second insert. The holder may include a first pocket, a second pocket, a first flute and a second flute. The second pocket may be located closer to the second end than the first pocket. The first flute may be extended along the first pocket. The second flute may be extended along the second pocket. A first length from the rotation axis to the first flute may be smaller than a second length from the rotation axis to the second flute. An opening width of the first flute may be smaller than an opening width of the second flute.

A metal cutting milling tool includes a body having a front end, a plurality of land portions extending axially rearwards from the front end, and a plurality of chip rooms extending axially rearwards from the front end. Each land portion is delimited by a leading and a trailing surface. Each land portion includes an insert seat for receiving a cutting insert. Each chip room is positioned between two adjacent land portions and is delimited by a chip room surface having the trailing surface of first land portion, the leading surface of a second land portion and a bottom surface positioned between the trailing and leading surface. Each chip room surface has a curvature with a smallest radius. The smallest radius in a second cross section and the smallest radius in a third cross section are larger than the smallest radius in a first cross section.

A rotary cutting tool. The tool has a body with outside diameter (OD), and outer surface, and a longitudinal axis, a plurality of flutes, helical in some embodiments. Flutes include a narrow leading edge land portion with circular segment profile and having flute cutting edge portions along a substantially uniform circumferential location, with an eccentric relief margin rotationally rearward of the narrow leading edge land portions. Face portions are provided with face cutting edge portions, and with a first dish portion adjacent each of the cutting edge portions sloping inwardly and downwardly generally toward a central longitudinal axis at a first dish angle alpha () Corner blend portions extend from flute cutting edge portions to the face cutting edge portions. Corner blend portions are provided in a variety of profiles, including an embodiment wherein the profile of the corner blend portions are truncated before the segment of curvature becomes tangential to the face cutting edge portions. Large core diameters of cutting tools are provided, which gives high strength when working with axial depths of cut of about three times outside tool diameter or less.

An end mill for shouldering and/or slotting applications includes at least one tooth including a cutting edge. The cutting edge includes a first sub-edge extending rearwardly from a cutting end face and a second sub-edge extending rearwardly from the first sub-edge. An angle transition intersection defines where the first sub-edge ends and the second sub-edge starts. The angle transition intersection is located generally between 20% to 75% of an effective cutting length from a cutting end face and more specifically at a location within the general location where there is an increase in the rake angle and/or a significant increase in the helix angle of the cutting edge.

A rotary cutting tool having an axis of rotation, a shank area, and a cutting area. The rotary tool has chip flutes reaching as far as a core profile in the cutting area. In order to reduce vibrations of the rotary cutting tool and therefore to permit precise machining and high surface quality with long service lives, the center line of the core profile has a course that deviates from the axis of rotation of the rotary cutting tool and/or the core profile contains mutually alternating sections with increasing cross-sectional area and sections with decreasing cross-sectional area over the length of the cutting area.