Osg Corporation

Btt Corporation

Jiro Osawa

Tasuku Itoh

Tomonori Yoda

Wataru Aoki

Takayuki Matsushita

Yasuo Hamatake

Tamotsu Nagai

Takuma Aoyama

Takayuki Nakajima

Katsutoshi Watanabe

Norihiro Masuda

Ryogo Kawai

Yusuke Tanaka

Kentarou Norimatsu

Takehiro Yamamoto

Hirotsugu Takahama

Masakazu Nakamura

Shigetoshi Ukei

Hiroshi Tomita

Ikuo Takikawa

Kentaro Norimatsu

A rotary cutting tool includes: a blade portion; a shank portion having a diameter larger than a diameter of the blade portion; and a tapered connecting portion connecting the blade portion and the shank portion. The shank portion includes a plurality of coolant-guide recessed grooves provided in its outer circumferential surface. Each of the coolant-guide recessed grooves has a groove depth and a groove width that is larger than the groove depth. Each of the coolant-guide recessed grooves has a groove bottom that is shaped such that the groove depth is reduced as the each of the coolant-guide recessed grooves extends from its start end toward a groove-depth regional-change position in which a tendency of change of the groove depth is changed.

Rotary cutting tool

Multiple grooves are provided on the outer circumferential surface of the body of an insert holder. A first holding surface of an insert first holding part, which is inserted between a groove bottom and a first protrusion, and a first protrusion surface of the first protrusion make surface contact and said surfaces are sloped so as to approach the groove bottom as the first end is approached. A second holding surface of an insert second holding part, which is inserted between the groove bottom and a second protrusion, and a second protrusion surface of the second protrusion make surface contact and said surface are sloped so as to approach the groove bottom as the second end is approached.

Cutting tool, insert holder and insert

A main body () of a replaceable-tip cutting tool () includes a cylinder-shaped cylindrical portion () made from a first metal material and extending in an axial direction, and with a female thread portion () provided on an inner circumference () of the cylindrical portion () and capable of being screwed together with a male threaded portion () of a cutting head (). The female thread portion () includes a first female thread portion () and a second female thread portion (). The first female thread portion () is a portion between a top of a female thread crest () of the female thread portion () and a portion of the female thread portion () that is on the female thread crest () side of a female thread root () and on the female thread root side of a portion corresponding to an effective diameter of the female thread portion (). The first female thread portion () is made from a second metal material that is different from the first metal material. The second female thread portion () is continuous with the inner circumference () of the cylindrical portion (). The second female thread portion is a remaining portion of the female thread portion excluding the first female thread portion. The second female thread portion () is made from the first metal material.

Replaceable-tip cutting tool main body and replaceable-tip cutting tool

An insert portion () of a reamer () is fixed, using screws (), to a leading end portion of a body (A). The insert portion () is configured by overlaying an insert () for finish machining and an insert () for rough machining, and forms a right hand cut right hand helix. On respective mating faces of the inserts (), convex portions and concave portions of the mating face of the insert () overlap with concave portions and convex portions of the mating face of the insert (). The reamer () can enlarge a hole formed in a workpiece or change a shape of the hole. The inserts () simultaneously cut an inner peripheral face of the hole, and can thus perform rough machining and finish machining in one pass. By overlapping the convex portions and the concave portions of each of the mating faces of the inserts (), they partially overlap in their respective thickness directions. A protrusion length of the insert portion () can thus be shortened.

Reamer

An insert portion () of a thread mill (A) is fixed to a leading end portion of a body (A) using screws (). The insert portion () is configured by overlaying an insert () for finish machining and an insert () for rough machining. On respective mating faces of the inserts (), convex portions and concave portions of the mating face of the insert () are overlaid with concave portions and convex portions of the mating face of the insert (). The thread mill (A) can cut a female screw in a hole formed in a workpiece by performing right-hand cut down-cut milling, for example. The inserts () simultaneously cut an inner peripheral surface of the hole, and the rough machining and the finish machining can thus be performed in a single pass. By the convex portions and the concave portions of the respective mating faces of the inserts () being overlaid with each other, the inserts () partially overlap in their respective thickness directions. As a result, a protrusion length of the insert portion () can be shortened.

Insert type tool and thread mill

A T-slot cutter () is a tool for cutting a T-groove in a workpiece, and includes a body (A) and an insert portion (). The insert portion () is fixed to a leading end portion of the body (A) using screws (). The insert portion () is configured by overlaying inserts () and (). By changing a combination of the inserts configuring the insert portion (), a groove width and an angular shape of the T-groove cut in the workpiece can be easily adjusted. On mating faces of the inserts (), convex portions and concave portions of the mating face of the insert () overlap with concave portions and convex portions of the mating face of the insert (). As a result, the inserts () partially overlap with each other in a thickness direction, and thus a protrusion length of the insert portion () can be shortened.

T-slot cutter

An indexable thread forming tap including: a body in a shaft shape; and a tip concentrically and detachably attached to a leading end portion of the body by screw-fastening and rotationally driven around an axial center along with the body for rolling of a female thread, the body being disposed with a screw hole concentrically to the axial center such that a screw shaft disposed on the tip concentrically to the axial center is screwed into the screw hole for the screw-fastening, a leading end surface of the screw shaft being pressed against a bottom surface of the screw hole into close contact with each other by the screw-fastening to integrally fix the tip to the body without the leading end of the body abutting on the tip, the body being disposed with a restraining hole concentrically to the axial center.

Indexable thread forming tap

A variable lead end mill has a plurality of peripheral cutting edges with different helix angles, the variable lead end mill having a flute bottom diameter of a plurality of helix flutes making up rake faces of the plurality of the peripheral cutting edges, the flute bottom diameter increasing in an axial direction from a tool tip toward a shank.

Variable lead end mill

A removable tip type rotary tool is provided in which a rotation stop key and a key groove each having a triangular shape are disposed on opposing surfaces of a body and a tip concentrically attached to a leading end portion of the body in a removable manner. A pair of side surfaces of the rotation stop key and a pair of side walls of the key groove are brought into surface contact by mounting screw. An angle for each of the pair of the side surfaces and the pair of side walls is between 60 to 100 degrees, a groove bottom of the key groove is rounded with a radius from 1.5 to 2.8 mm, corners of opening edges on both sides of the key groove and corners of both base-end side portions of the rotation stop key are rounded with radiuses, respectively, from 1.5 to 2.8 mm.

Removable tip type rotary tool

A machining head replaceable rotating tool having a fastening male screw and a fastening female screw disposed on respective shaft centers of one and the other of a machining head and a holder, the fastening male and female screws being threadably engaged with each other to concentrically and removably attach the machining head to a tip portion of the holder, the machining head and the holder being disposed with abutting surfaces abutted against each other in a fastened state when the fastening male and female screws are threadably engaged, the machining head replaceable rotating tool being integrally and rotationally driven via the holder in a tool rotation direction causing the fastening male and female screws to be fastened by a machining load to perform predetermined machining with the machining head, the abutment of the abutting surfaces preventing the fastening male and female screws from being further fastened by a machining load, the fastening male and female screws being saw-tooth buttress screws having a following flank angle &#x3b1; smaller than a leading flank angle &#x3b2;.

Machining head replaceable rotating tool, holder, and machining head

A throw-away rotating tool includes plural protrusions formed in a part of an outer peripheral wall of a projecting coupling portion. Since the twist angle and a twist direction of the protrusions are set in such a way that with relative rotation when coupling the projecting coupling portion and erected portions together, due to the reaction force received by the protrusions from inner peripheral walls, the projecting coupling portion is pulled to the rear and side of the erected portions and the projecting coupling portion is stably held between the erected portions. Since the number of portions that require stringent dimension control and high machining accuracy can be reduced, productivity can be improved.

Throw-away rotating tool

A bevel head replaceable rotary tool is provided. The rotary tool includes a coupling protrusion and a coupling recess, plural sets of serrations provided on an outer circumferential surface of the coupling protrusion and an inner wall surface of the coupling recess, circumferential abutting portions provided on the tool body and the bevel head, and axial tight-contact portions, provided on the tool body and the bevel head. The serrations of the coupling protrusion and the serrations of the coupling recess arranged such that curvatures of circumferential circular arcs of the serrations of the coupling protrusion are greater than those of the serrations of the coupling recess or the serrations of the coupling protrusion and the serrations of the coupling recess have circumferential circular arcs with centers deviated from each other.

Bevel head replaceable rotary tool, bevel head and tool body

A cutting tool is designed to prevent chip packing. The cutting tool includes a body that rotates about an axis center, a hole portion that is open in a tip end surface of the body, a wall portion that is formed of the hole portion and an outer circumferential surface of the body, a notch portion that is communicated with the hole portion, and a blade portion that is formed or held at a portion where the notch portion intersects with the tip end surface of the wall portion. The blade portion includes an inner side surface that passes through an inner end portion of a bottom blade and intersects with a rake surface through a ridge line. The inner side surface is inclined so that a distance between the inner side surface and the axis center is increased towards a direction opposite to the rotational direction of the body.

Cutting tool

A throw-away rotating tool improves workability of detaching a throw-away tip and prevents from damaging a body. In the throw-away tool, a convex connection for the throw-away tip has protrusions, each of the protrusion includes a sliding contact portion detachably fitted into the inner peripheral groove recessed in the inner peripheral wall of a body. The protrusion has a first tilt portion continuous to the sliding contact portion. In detaching the throw-away tip from the body, the first tilt portion rotates ahead of the sliding contact portion, and a standing portion is elastically deformed due to a wedge effect of the first tilt portion. As a result, the protrusion can be gently removed from the inner peripheral groove.

In FIG., a diameter Dd of drilling edges of a drill is selected smaller than a valley diameter dof a male thread of a tap portion, and an inner diameter Dof a female thread is defined by the valley diameter dof the male thread. Therefore, a predetermined radial gap is formed between the male thread 30 formed by the tap portion and the drill. When a tap with the drill is reversely rotated to be pulled out from the female thread after cutting the female thread, the tap released from the restriction may deflectively displace in the diameter direction upon pulling out the male thread of the tap portion from the female thread. However, the drill hardly contacts with the female thread, so that the occurrence of the defective product due to the contact is suppressed.

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Toyokawa, Japan

Jiro Osawa