Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Reexamination Certificate
1999-12-22
2001-06-05
Bishop, Steven C (Department: 3722)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
C279S008000, C408S231000, C409S234000
Reexamination Certificate
active
06241433
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a machining tool and a cutting head therefor.
PRIOR ART
Through U.S. Pat. No. 5,947,660 there is previously known a tool in which a cutting head is mounted on a rotatable holder. The cutting head has a blind hole formed in a rear surface thereof facing a front surface of the holder. A fastener screw extends axially through the holder and is threadedly connected within the blind hole to pull the rear surface and the front surface against one another. The rear surface of the cutting head and the front surface of the holder include ribs and grooves that form an interlocking relationship in response to rotation of the fastening screw. Such tools, when being of small dimensions have been found to lack sufficient strength or stability in the coupling between the cutting head and the tool body.
OBJECTS OF THE INVENTION
One object of the present invention is to provide a coupling for two tool parts, whereby a great load capacity can be transferred therebetween.
Another object of the present invention is to provide a tool which is continuously stable.
Still another object of the present invention is to provide a tool having good precision.
These and other objects have been achieved by a tool for cutting machining, the tool comprising a holder, a cutting head, and a fastener. The holder defines a longitudinal axis of rotation and includes a front surface oriented radially with respect to the axis. The cutting head includes a carrier body and an insert. The carrier body is formed of injection molded cemented carbide. The carrier body carries a cutting edge at its front end and includes a rear surface oriented radially relative to the axis and abutting the front surface of the holder. The rear surface has a central blind hole formed therein. The insert is secured in the blind hole and is formed of a material which is softer than that of the carrier body. The fastener is disposed in the holder and engages the insert for pulling the insert and the carrier body toward the holder.
The invention also pertains to the cutting head per se.
REFERENCES:
patent: 1016116 (1912-01-01), Walters
patent: 3878905 (1975-04-01), Schaumann
patent: 3973861 (1976-08-01), Sussmuth
patent: 5114286 (1992-05-01), Calkins
patent: 5399051 (1995-03-01), Aken et al.
patent: 5695304 (1997-12-01), Ebert
patent: 5769577 (1998-06-01), Boddy
patent: 5947660 (1999-09-01), Karlsson et al.
patent: 6012881 (2000-01-01), Scheer
patent: 6109841 (2000-08-01), Johne
patent: 2523201A1 (1976-12-01), None
Koskinen Jorma
Rydberg Christer
Bishop Steven C
Burns Doane Swecker & Mathis L.L.P.
Seco Tools AB
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