Osg Corporation

Matsushita Electric Industrial Co., Ltd.

Btt Corporation

Tamotsu Nagai

Jiro Osawa

Hideaki Matsuhashi

Wataru Aoki

Yasuo Hamatake

Katsutoshi Watanabe

Hirotsugu Takahama

Masakazu Nakamura

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

A neck portion grinding apparatus and method is designed to reduce working man-hours and to improve processing accuracy with respect to a processing of a workpiece. The neck portion grinding apparatus includes a grinding device having a disc-like grinding wheel and a wheel rotating device for rotating the grinding wheel, and a machine tool having a main shaft for rotatably supporting a rotating tool and a table mounting the grinding device thereon, and relatively moving the main shaft and the table by numeral control. A shape of a neck portion of the rotating tool can be changed by relatively moving the main shaft and the table while mutually rotating the rotating tool and the grinding wheel, and grinding the rotating tool by the grinding wheel.

Neck portion grinding apparatus and grinding device employed in the neck portion grinding apparatus

A cutting tool including a cutter head and a holder. One of the cutter head and the holder has a recess formed in its axial end portion and defined by its circumferential wall. The other of the cutter head and the holder has a protrusion formed in its axial end portion, such that the cutter head and the holder are detachably attached to each other, with the protrusion being introduced in the recess by an axial distance. The above-described one has coaxial holes formed in the circumferential wall. The above-described other has an engaging surface which is recessed from an outer circumferential surface of the protrusion and which is held in engagement with a pin that is received in the coaxial holes. Each of the coaxial holes has an axis which is inclined, with respect to a plane perpendicular to an axis of the above-described one, in a direction causing the above-described axial distance to be increased by a cutting resistance generated in a cutting operation.

Cutting tool including detachable cutter head

A non-rotary cutting tool which is to be moved relative to a workpiece in a predetermined direction for cutting the workpiece, with its rake face being held substantially perpendicular to the predetermined direction. The cutting tool includes (a) a generally cylindrical shank portion, and (b) a generally semi-cylindrical body portion which has an outer circumferential surface constituted by the rake face and a semi-cylindrical surface. The semi-cylindrical body portion has a cutting edge which is defined by an edge of the rake face and which is covered with a diamond coating. Also disclosed is a process of machining a scroll member of a scroll compressor by using this non-rotary cutting tool.

Non-rotary cutting tool and process of machining scroll member by using the same

A process of machining a scroll member of a scroll compressor by using a non-rotary cutting tool. The non-rotary cutting tool is moved relative to a workpiece in a predetermined direction for cutting the workpiece, with its rake face being held substantially perpendicular to the predetermined direction. The cutting tool includes (a) a generally cylindrical shank portion, and (b) a generally semi-cylindrical body portion which has an outer circumferential surface constituted by the rake face and a semi-cylindrical surface. The semi-cylindrical body portion has a cutting edge which is defined by an edge of the rake face and which is covered with a diamond coating. The rake face has a planar surface and a constant width throughout the cutting edge.

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Toyokawa, Japan

Tamotsu Nagai