Sumitomo Electric Industries, Limited

Sumitomo Electric Hardmetal Corp.

Dmg Mori Seiki Co., Ltd.

Manchester Tool Company

Kazuo Noguchi

Toshio Nomura

Kazutaka Isobe

Nobuyuki Kitagawa

Yoshikatsu Mori

Tsuyoshi Asai

Nobuhiro Takahashi

Masafumi Hideshima

Junya Okida

Hisanori Ohara

Shigenori Emoto

Daisuke Murakami

Masaaki Jindai

Morihiro Hideta

Shinya Ikenaga

Nagatoshi Kunimori

Kazuchika Nasu

Yohei Oda

Reizo Murakami

Hideo Mori

Keith A Konet

Kazuya Ishikawa

Suehiro Ikeda

Takayuki Hirokawa

Keiji Hirose

Yoshio Ohara

Sunao Setoguchi

Hiroshi Arimoto

Yasutaka Okada

Kazuyoshi Kimura

A cutting insert is configured to include: a first portion having a rake face, a flank face, a cutting edge, and a face facing an insert attachment portion at an end of a tool main body; and a second portion having a side surface including at least one flat plane that is parallel to a center line of a tool or inclined at a prescribed angle to the center line. The second portion extends continuously to a region surrounded by the face of the first portion. The second portion is fitted into the tool main body to position the cutting insert and to prevent the cutting insert from rotating.

Lathe turning tool

A coated tool includes a base material and a wear-resistant coating film formed on the base material. The composition of the wear-resistant coating film is expressed as (Ti.sub.x,Al.sub.y,V.sub.z)(C.sub.u,N.sub.v,O.sub.w). Relations x+y+z=1, u+v+w=1, 0.2&lt;x&lt;1, 0.ltoreq.y&lt;0.8, 0.02.ltoreq.z&lt;0.6, 0.ltoreq.u&lt;0.7, 0.3&lt;v.ltoreq.1 and 0.ltoreq.w&lt;0.5 hold between x, y, z, u, v and w. The thickness of the wear-resistant coating film is at least 0.5 .mu.m and not more than 15 .mu.m. A coated cutting tool in particular includes a base material consisting of cemented carbide and a wear-resistant coating film formed on the surface of the base material. The wear-resistant coating film includes a titanium nitride film which is formed to be in contact with the surface of the base material, and a composite nitride film, formed on the titanium nitride film, containing titanium, vanadium, nitrogen and an unavoidable impurity or titanium, aluminum, vanadium, nitrogen and an unavoidable impurity, or a composite carbo-nitride film, formed on the titanium nitride film, containing titanium, vanadium, carbon, nitrogen and an unavoidable impurity or titanium, aluminum, vanadium, carbon, nitrogen and an unavoidable impurity. The outermost surface of the wear-resistant coating film is coated with a low melting point oxide, containing vanadium oxide, having a melting point of not more than 1000.degree. C.

Coated tool and method of manufacturing the same

A throwaway drill capable of machining a workpiece stably in a balanced manner even under high-efficiency, high-load conditions and capable of disposing of chips efficiently and smoothly. The drill carries an outer insert and an inner insert. As shown, each insert has a plurality of cutting edges each having a curved crest, a first slope, and a second slope which is at least partially a curved line. The inner and outer inserts are arranged so that the cutting area to be cut by the outer insert alone is partially cut by a cutting edge portion of the inner insert near its corner, and the cutting area which to be cut by the inner insert alone is partially cut by the crest of one cutting edge of the outer insert.

Throwaway inserts and throwaway drill

A drill has a pair of cutting edges (4) which are arranged at positions that are substantially uniformly circumferentially spaced about its rotation axis. Each of the cutting edges (4) has a first linear cutting region (4a) and a second linear cutting region (4b) which are aligned with each other on the same straight line, and a curved cutting region (4c) which is located between the first and second linear cutting regions (4a, 4b). The curved cutting region (4c) has a third linear cutting region (4e, 4f) which extends in a direction intersecting with the second linear cutting region (4b) at a prescribed angle. With this structure, it is possible to prevent chip loading etc. which may be caused during perforation drilling operations. In a throw-away tipped drill, a notch (118a) is formed in a received portion of an insert (110) which is mounted on a shank (130). A holding portion (131a, 131b, 133a, 133b) of the shank (130) corresponding to the notch (118a) is provided with a through screw hole (138). A male screw (139) is inserted in the through screw hole (138), and a spherical pressing member (140) is interposed between the forward end of the male screw (139) and the surface of the notch (118a) of the insert (110). With this structure, it is possible to prevent separation of the insert (110) from the shank (130).

Drill and lock screw employed for fastening the same

Throw-away tipped drill

A drill bit has a throw-away drill bit tip in the form of an insert (21, 31) secured to a shank (22, 32) to be mounted in a drilling tool. The insert (21, 31) is disengageably mechanically connected to the shank (22, 32) without any screws. The insert (21, 31) is formed of a silicon carbide whisker reinforced alumina sintered body, and the shank (22, 32) is made of steel. Due to this structure, the insert (21, 31) has an excellent wear resistance and an adhesion resistance. The shank (22, 32) has a sufficient toughness against breakage. Such a drill bit does not require any resharpening for continuous use during bit life.

Throw-away tipped drill bit

A drill bit has a throw-away drill bit tip in the form of an insert (21, 31) secured to a shank (22, 32) to be mounted in a drilling tool. The insert (21, 31) is disengageably mechanically connected with the shank (22, 32) without any screws. At least a cutting edge of the insert (21, 31) is made of a diamond or cubic boron nitride sintered body, and the shank (22, 32) is made of steel. Due to this structure, the insert (21, 31) has an excellent wear resistance and an adhesion resistance. The shank (22, 32) has sufficient toughness against breakage. Such a drill bit does not require any resharpening for continuous use during bit life.

A cutting-off tool having an insert having two side cutting edges formed by the ridge lines defined by a rake face and side flanks. These edges are chamfered so that the cutting edge at one side which is likely to hit the falling part of the material cut off is chamfered by a larger width than at the other side.

Cutting-off tool

A throw away cutting tool comprising a holder formed with a wedge groove and a throw away insert having a cutting edge at one end thereof and a wedge portion at the other end, the wedge portion being adapted to be clamped in the wedge groove by elasticity of the material of the holder. The holder is at least partly made of cemented carbide for higher rigidity and cutting stability. Also, the radius of curvature at the deep end of the wedge groove is optimized for crack resistance. Further, the angle of the V-ridge on the holder is interrelated to the angle of the V-groove in the insert for more holding stability and crack resistance.

Throw away cutting tool

A throw away cutting tool comprising a holder formed with a wedge groove and a throw away insert having a cutting edge at one end thereof and a wedge portion at the outer end, the wedge portion being adapted to be clamped in the wedge groove by elasticity of the material of the holder. The holder is at least partly made of cemented carbide for higher rigidity and cutting stability. Also, the radius of curvature at the deep end of the wedge groove is optimized for crack resistance. Further, the angle of the V-ridge on the holder is interrelated to the angle of the V-groove in the insert for more holding stability and crack resistance.

An improved insert 10 for deep grooving, contouring and cut-off operations is disclosed which is provided with two kinds of chip-breaking projections, three in all. There are two frusto-conical projections 30 near the cutting edge 16 and there is a V-shaped projection 32 behind the frusto-conical projections. The insert expands the range of materials of the work, the groove diameters that can be cut and the feeds and speeds of operations, through improved chip control.

Grooving insert

Growing community of inventors

Itami, Japan

Kazuo Noguchi