Cutters – for shaping – Including holder having seat for inserted tool – With separate means to fasten tool to holder
Reexamination Certificate
1999-12-22
2001-08-14
Tsai, Henry (Department: 3722)
Cutters, for shaping
Including holder having seat for inserted tool
With separate means to fasten tool to holder
C407S119000, C407S064000
Reexamination Certificate
active
06273650
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a tool for cutting machining, a cutting insert and a method for mounting such a cutting insert.
PRIOR ART
Traditionally circular indexable inserts are used having a diameter down to about 5 mm. The smallest circular indexable inserts are to be regarded as rings of cemented carbide in order to obtain space enough to accommodate a retaining screw, which holds the cutting insert in the cutting insert pocket. Through WO 98/13161 is previously known a ball nose milling cutter comprising a milling head attached via a pull rod to a shank. The milling head comprises injection molded cemented carbide and has a cutting edge which extends towards the rotational axis of the tool. The milling head has a thread, which is integral with, and thereby made of the same material as, the cutting edge. The milling head comprises a key grip consisting of diametrical opposite planar surfaces. Through WO 95/33590 is previously known an injection molded cutting insert with an integral thread. Through U.S. Pat. No. 5,496,137 is previously known an end mill with a head having an integral thread and manufactured in accordance with an older technique. The problem of prior art tools of the above-noted types is that if these tools are of small dimensions, then less strength is obtained and the tools are difficult to manipulate.
OBJECTS AND SUMMARY OF THE INVENTION
One object of the present invention is to provide a tool for cutting machining having advantages of the prior art tools.
Another object of the present invention is to provide a tool for cutting machining and a cutting insert with improved strength and which is easy to manipulate.
Still another object of the present invention is to provide a tool for cutting machining and a cutting insert, the designs of which enable the cutting insert to be secured more tightly during operation.
Still another object of the present invention is to provide a method to easily mount such a cutting insert.
These and other objects have been achieved by a tool for cutting machining, a cutting insert and a method for assembling such a tool. The cutting insert comprises a body having at least one cutting edge, securing means disposed on a first side of the body, and a key grip disposed on a second side of the body. The securing means is adapted to secure the body against a holder in response to rotation of the insert about an axis of the securing means. The key grip is configured to be rotated about the axis by a key. The insert comprises injection molded cemented carbide, whereby the body, the securing means, and the key grip are integrally formed with one another.
The method comprises the steps of:
A) providing the above described cutting insert;
B) positioning the cutting insert on a holder such that the securing means engages second securing means disposed on the holder;
C) engaging a key with the key grip; and
D) rotating the cutting insert, using the key, in a direction so that the second securing means pulls the first securing means toward the holder to cause the body to abut the holder.
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patent: 280146 (1883-06-01), Douglas
patent: 1458802 (1923-06-01), Bufford
patent: 1926531 (1933-09-01), Graham
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patent: 5496137 (1996-03-01), Ochayon et al.
patent: 5733073 (1998-03-01), Zitzlaff et al.
patent: 5795120 (1998-08-01), Hurdle
patent: 5899642 (1999-05-01), Berglöw et al.
patent: 5947660 (1999-09-01), Karlsson et al.
patent: 5976455 (1999-11-01), Pantzar et al.
Burns Doane Swecker & Mathis L.L.P.
Seco Tools AB
Tsai Henry
LandOfFree
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