Tool and insert for chip removal machining

Details Tool and insert for chip removal machining Tool and insert for chip removal machining

1997-08-28

2001-06-12

Tsai, Henry (Department: 3722)

Cutters, for shaping

Including holder having seat for inserted tool

With separate means to fasten tool to holder

C407S108000, C407S117000

Reexamination Certificate

active

06244790

ABSTRACT:

THE FIELD OF THE INVENTION
The present invention relates to a tool and a cutting insert for chip removing machining, preferably for grooving or slot milling. The tool comprises a holder and a cutting insert. The holder comprises at least a cutting insert pocket, which has an upper side and a lower side. The cutting insert comprises an upper surface and a lower surface. The upper side of the cutting insert pocket and the upper surface of the cutting insert comprise first cooperating contact surfaces, which define a first flank angle. The lower side of the cutting insert pocket and the lower surface of the cutting insert comprise second cooperating contact surfaces, which defines at least a second flank angle.
PRIOR ART
In U.S. Pat. No. 5,112,164 there is, concisely, described a tool of the above mentioned type. The cutting insert and the holder have cooperating grooved surfaces, wherein the first and second flank angles are identical. With the known tool it is a danger that the cutting insert is inserted incorrectly, that may be the cutting insert can be inserted into the seat but incorrectly positioned in the lateral direction of the cutting insert. In addition, the known solution puts high demands on the manufacturing of the grooved parts.
Through a number of patents it is previously known to provide tools with cooperating grooves between the cutting insert and the holder. A common problem for these known tools is that the cutting insert can be incorrectly positioned in the holder.
OBJECTS OF THE INVENTION
One object of the present invention is to provide a rigid tool preferably for thin holders and cutting inserts.
Another object of the present invention is to provide a tool and a cutting insert in which the cutting insert cannot be incorrectly positioned.
Another object of the present invention is to provide a tool and a cutting insert where the advantage with grooves is combined with a relatively simple manufacturing.
Still another object of the present invention is to provide a tool and a cutting insert in which the cutting insert cannot be positioned obliquely even if one of the cooperative grooved surfaces are worn out.
Still another object of the present invention is to provide a tool and a cutting insert where the clamping force is distributed on such a large area that the cutting insert does not risk splitting.
Still another object of the present invention is to provide a tool and a cutting insert where twisting of the cutting insert under machining is avoided.
Still another object of the present invention is to provide a tool and a cutting insert with great resistance against extraction of the cutting insert from the holder.
Still another object of the present invention is to provide a tool and a cutting insert where the relative movement between cutting insert and the holder is negligible.
Still another object of the present invention is to provide a tool and a cutting insert where the cutting insert more easily is guided into the cutting insert pocket during mounting.
These and other objects have been achieved by a tool and a cutting insert as defined in the appended claims with reference to the drawings.


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