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US Patent: 5,240,356
Nitrided Cutter Machining
Patentees:
Tatsuo Arai (exact or similar names) - Ibaraki, Ibaraki Prefecture, Japan
Takayoshi Saito (exact or similar names) - Ibaraki, Ibaraki Prefecture, Japan

USPTO Classifications:
407/119, 407/33, 407/34

Tool Categories:
metalworking machines : metalworking machine tool holders : insert tool holders
metalworking machines : milling machines : milling machine cutters

Assignees:
Mitsubishi Materials Corp. - Tokyo, Tokyo Prefecture, Japan

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 26, 1992
Granted: Aug. 31, 1993

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
Description:
Foreign application priority in Japan: 28 Mar, 1991; 06 Aug., 1991 & 08 Aug., 1991.

Abstract

A cutting tool is disclosed which includes a tool body having a mounting portion to be secured to a machine tool and having a plurality of insert receiving recesses formed therein. A plurality of cutting inserts are releasably attached to the insert receiving recesses, respectively. The tool body has a nitrided hard layer formed on a surface thereof. Furthermore, a clamp member used in the tool preferably has an abutment surface to be held in abutting contact with the insert or other parts and a chip-contacting surface with which cutting chips produced during cutting operation are brought into contact. The chip-contacting surface is defined by a nitriding hard layer formed on a precision-cast unglazed surface, and has a surface which is left without finish-working. Furthermore, a method for producing a cutting tool which includes a tapped hole formed therein and having an inner surface defining an unnitrided portion is disclosed. In this method, a plug is first threaded into the tapped hole. Subsequently, the tool body is subjected to nitriding treatment to form a hard layer on the surface of the tool body, and the plug is subsequently removed from the tool body.

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