Mitsubishi Materials Corporation

Mitsubishi Kinzoku Kabushiki Kaisha

Nissan Motor Company Limited

Mitsubishi Materials Kobe Tools Corporation

Ryoco Seiki Co., Ltd.

Hiroshi Shimomura

Hidehiko Nagaya

Tatsuo Arai

Kazuo Iizuka

Jun Kitajima

Nobukazu Horiike

Tomoyoshi Sakamoto

Koichi Ikenaga

Masaaki Nakayama

Masayuki Okawa

Syoji Takiguchi

Kazuhiko Takashima

Akira Kanaboshi

Kazuya Yamazaki

Yoshihisa Ueda

Sueji Takaya

Masaya Tsuchitani

Takamasa Shimano

Makoto Harano

Shouji Takiguchi

Hiroyuki Ushijima

Yasutaka Okazaki

Akifumi Hamada

Katsuyoshi Karino

Rikihiko Nagata

A cutting edge configuration of a cutting tool for performing a cutting process on a surface () of a workpiece (), the cutting tool including a rake face () provided with first and second cutting edges (), the cutting tool being moved relative to the surface-to-be-cut () with the first and second cutting edges () cutting thereinto to thereby perform the cutting process, wherein the first cutting edge () is positioned ahead of the second cutting edge () in a cutting direction (z-direction) of the cutting tool to provide the rake face () with a feed-direction (y-direction) rake-angle, and the cutting tool is fed in a direction from a side of the second cutting edge () to a side of the first cutting edge ().

Cutting edge configuration of cutting tool

1. The throwaway tip characterized that the shape is approximately square type plate late, and the corner angle of the another two corner tooth which adjoins each other of one face is made as 90&#xb0; or less, and the other two corner edge which counters respectively is made as non parallel cutting tooth. 2. The throwaway type cutting tool characterized that two or more throwaway tip is the same as the throwaway tip of claim 1, and the throwaway tips are arranged so that the other two corner tooth projects respectively to a perimeter side of a tip of a main part of a tool, in a throwaway type cutting tool that the two or more throwaway tips are arranged so that the tip is projected respectively to a tip side of a main part of a tool.

Throwaway tip and throwaway-type cutting tool

A cutting tool including an end-milling tool body having a distal end, and a tip mounted to the distal end. The tip is a substantially planar plate including a first edge corner having an angle of less than 90&#xb0;, a second edge corner having an angle of greater than 90&#xb0;, and a third edge corner and a fourth edge corner each having a corner angle of 90&#xb0;. Alternatively, a plurality of tips are mounted to the distal end, where each tip has first, second, and third straight cutting edges. The second edge being at less than 90&#xb0; with the first edge and the third edge being at less than 90&#xb0; with the second edge, and at least one of a first corner between the first and second edges and a second corner between the second and third edges is arranged to project along an outer periphery of the distal end.

In this insert, in addition to the insert being formed so that the cutting edge is twisted at a helix angle within the range of 5&#xb0; to 25&#xb0; about the axis when the insert is attached to the insert mounting seat, the thickness of the insert body at the flank located on a straight line, which passes through the center of the rough hemisphere formed by the rotational locus of the cutting edge and forms an angle of inclination of 90&#xb0; relative to the axis, is set to be within the range of 0.5 D to 0.9 D relative to the thickness D of the rough plate that composes the insert body. As a result, since a comparatively gentle but adequately large helix angle is imparted to the cutting edge, cutting resistance decreases. In addition, since the thickness of the insert body at the flank on the rear end side of the insert body is not excessively thin, the rigidity of the insert body is adequately secured.

Ball nose cutting insert and ball end mill thereof

A ball nose end mill includes a tool body and a throwaway insert mountable on the tool body. The throwaway insert includes a bottom face as a mounting face, an upper face on an opposite side from the bottom face, a side face formed between the bottom face and the upper face, and a cutting edge formed along an intersecting ridge between the upper face and the side face in a substantially arc shape such that the rotational trace of the cutting edge when the throwaway insert is attached to the tool body in use substantially forms a partial spherical surface. An undulating portion, which is formed by alternately arranged concave portions and convex portions, is provided on the upper face so as to intersect the cutting edge. At least one of the concave portions is formed as a deep-concave portion which has a greater depth than that of the others.

Ball nose end mill with throwaway insert

A throwaway-type cutting tool including a tool body having a distal end, and a plurality of throwaway tips mounted to the distal end. Each of the plurality of throwaway tips including a plate of a substantially rectangular shape. The plate has a corner angle of two adjacent corner cutting edges of a first side in a surface being to 90&#xb0; or less, and two opposing ridges on the first side including the two adjacent corner cutting edges are defined as cutting edges which are in a non-parallel orientation to each other. Each of the plurality of throwaway tips have a cutting edge arranged to project toward the distal end. The two adjacent corner cutting edges on the first side in each of the plurality of throwaway tips are arranged to project toward an outer periphery of the distal end of the tool body.

A throwaway insert enables reduction in cutting force and improves chip separation ability without sacrificing the strength of cutting edge thereof. An upper face of the throwaway insert is provided with an undulating portion, which is formed by alternately arranged concave portions and convex portions, so as to provide a wavy shape to the cutting edge. The undulating portion comprises four concave portions, i.e., a first deep-concave portion, a first shallow-concave portion, a second deep-concave portion, and a second shallow-concave portion. The first deep-concave portion and the second deep-concave portion are located so that effective cutting region of the cutting edge is divided into three portions having lengths substantially equal to each other, and the second deep-concave portion is made deeper than the first deep-concave portion.

Throwaway insert

In the tool for bore diameter work of the present invention, first and second insert restraining faces are provided opposite each other on a insert installation section, and have projecting V-shapes parallel to the longitudinal direction of a shank. The top and bottom faces of the insert have indented V-shapes in correspondence with the first and second insert restraining faces. When a clamp bolt is tightened, the first insert restraining face elastically changes shape toward the second insert restraining face, pressingly securing the insert in the shank. Therefore, the insert can be easily attached and removed, and high installation rigidity of the insert can be maintained.

Tool for bore diameter work

A rhombic cutting insert includes cutting edges merging with each other at a nose part disposed at a diagonal acute-angle corner of an upper face of the insert. The cutting edges each form convex-curved shapes and are each inclined with respect to a mounting face of the insert. The cutting edges each include linear sub-cutting-edges, disposed in the vicinity of the nose part, forming a substantially right angle therebetween. Rake faces are formed on the upper face of the insert and each have positive rake angles and twisted-inclined surfaces. The insert is mounted on a tool part. One cutting edge serves as a peripheral cutting edge having a sub-cutting-edge disposed substantially parallel to an axis of the tool part, and the other cutting edge serves as a facing cutting edge having a sub-cutting-edge disposed substantially perpendicular to the axis of the tool part.

Throwaway insert and throwaway-type cutter

A cutting tool including a tool holding portion and a tool. The tool is configured to be inserted into a hole of the tool holding portion. The tool includes a tool main body, a guide portion, and a shoulder portion. The tool maim body has a tool outer diameter larger than the hole inner diameter of the hole when the tool holding portion is not heated. The guide portion is coaxially connected to the tool main body and configured to position the tool substantially coaxially with respect to the tool holding portion. The guide portion has a guide outer diameter smaller than the hole inner diameter of the hole so that the guide portion is inserted into the hole. The shoulder portion is formed between the tool main body and the guide portion so as to sit on a surface around the hole to support the tool when the guide portion is inserted into the hole.

Cutting tool and shrink fitting method for the same

In an interference fit type cutting tool according to the present invention, a projection of an edge section and a hole portion of a shank section are fitted by shrinkage fitting. The shank section is provided with an insertion hole that is coaxial with the center axis O thereof, and a threaded hole is provided in a part thereof. A rodlike set screw is in threaded engagement with the insertion hole , and a leading end portion thereof can project into a space between the projection and the hole portion . By screwing the set screw in to press an end face of the projection of the edge section in a heated state, the edge section can be detached from the shank section , and the edge section , the shank section , and the like can be replaced without causing the problem of waste oil disposal and without chipping the edge section or the like.

Interference fit type cutting tool

In an interference fit type cutting tool according to the present invention, a head section and a shank section are fitted together by shrinkage fitting. The shank section is provided with a shaft portion and a taper portion. The head section is provided with a hole portion to be fitted on the shaft portion, and a tapered portion to be fitted on the taper portion. The hole portion and the tapered portion have an interference, and the inner diameters thereof are smaller than the outer diameters of the shaft portion and the taper portion. Two-surface restraint is established by fixing the shaft portion and the hole portion, and the taper portion and the tapered portion with the interference pressure by shrinkage fitting. A key is formed on the leading end face of the shaft portion, a key groove is formed in the bottom face of the hole portion, and the key and the key groove are fitted together. Side faces of the key and the key groove are nearly orthogonal to the principal force of cutting resistance, thereby enhancing dynamic stiffness.

A cutting tool for a machine tool including a tool body, at least one cutting edge and a cutting medium supplier. The tool body has one and another end portions along an axis thereof and is configured to be attached to a machine tool at the another end portions to be rotatable. At least one cutting edge is provided on the one end portion of the tool body. The cutting medium supplier supplies an atomized cutting fluid or a chilled gas to a place where a work is cut by the cutting edge.

Cutting tool and method for supplying cutting medium to the same

A cutting tool has a slidable cutting-blade chip 5A, in which a slider 7 is slidably mounted into a groove 6 formed in the cutting tool main body 1, to offset a pressing force applied to the bottom face 6c of the groove 6 through the slider 7, to prevent abrasion of the slider 7 and the groove 6 and uneven abrasion of serration grooves 7a and 8a of the slider 7 and a spacer 8, and to suppress backlash of the slider 7. A spacer 9 is detachably disposed between one side face 6a of a groove 6 and a slider 7, a plate 22 is disposed between another side face of the slider 7 and another side face 6b of the groove 6 so as to press the plate 22 toward the side face 6a. A protruding section 21 and a dent section 24 each have a V-shape cross-section and are formed on another side face of the slider 7 and on one side face of the plate 22, respectively, wherein the protruding section 21 and the dent section can come into contact with each other.

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Tsukuba, Japan

Hiroshi Shimomura