Woodworking – Rotary cutter – Solid
Reexamination Certificate
2000-03-19
2001-03-27
Bray, W. Donald (Department: 3725)
Woodworking
Rotary cutter
Solid
C076S108200, C144S218000, C144S329000, C408S226000, C408S227000, C419S005000, C419S053000
Reexamination Certificate
active
06206062
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a shank-type cutter body of a hard material for the cutting of wood.
Shank-type cutters are used for example for cutting grooves and slots or other recesses into solid wood and also into resin-impregnated pressboard in furniture- window- and door manufacturing operations. These shank-type cutters are often provided with a front cutting end, whereby the shank-type cutter can be introduced into the wooden to be worked in axial direction at one end of a groove or slot to be cut. After the cutter has been advanced axially into the wood to the predetermined depth of the groove or slot to be cut it is moved transverse to the cutter axis, while the cutting edges formed at its circumference are cutting.
It is well-known that the cutting of wood and particularly of pressboards causes substantial wear of the cutting edges of the cutters. The materials used for such cutters are therefore generally hard metal materials in order to obtain a reasonable service life. Since, in these cutters, the cutting edges must extend in a screw-type fashion along the circumference and the axial length of the cutters is a multiple of the diameters of the cutters, the whole shank-type cutter must be made of a hard metal. Tis is in contrast to simple drills or some disc cutters, where the cutting edges may be formed by separate hard metal plates, which are welded onto the cutter body that consists of regular tool steel. The cutters with which the present invention is concerned require therefore extensive grinding particularly for forming the chip accommodating spaces as these spaces need to be ground out of the hard metal shank.
It is the object of the present invention to provide a more simple, faster and substantially less expensive method of manufacturing such shaft-type cutters of hard metal for wood working processes.
SUMMARY OF THE INVENTION
In a shaft-type cutter body of hard material including a shaft for mounting the cutter in a chuck and a head including cutting areas with cutting edges disposed around the circumference of the head, the shaft and the head are formed integrally by injection die casting or of powdered raw material followed by sintering. The unfinished cutter body includes cutting edge sections with recessed areas adjacent the cutting surface for receiving wood chips and delimiting the cutting surface front area and a surface area receding radially inwardly from the rear surface area of the cutting edge so as to limit the rear cutting edge surface area.
Because of the manufacture of the unfinished shaft-type cutter as an injection die-cast shaped unfinished part, which already includes recesses adjacent the edges for accommodating the wood chips, the grinding work can be limited to the cutting edges, so that only a fraction of the grinding operations is needed of what is normally required for the manufacture of this type of shank cutters. As a result, a substantial cost advantage is obtained.
The injection die-casting procedure of manufacturing the unfinished shaped body permits further advantageous modifications in forming the shaft-type cutter according to the invention. In contrast to known shaft cutters, the shaft-type cutter according to the invention may be provided with a hollow shaft, which saves weight and especially material.
As materials for forming the unfinished shaft cutter according to the invention and of course the finished cutter formed from the unfinished cutter by finish grinding, not only hard metal materials, but also ceramic materials may be used. They should all be considered to be covered by the term hard materials as referred to earlier.
REFERENCES:
patent: 612526 (1998-10-01), Morgan
patent: 4470733 (1984-09-01), Marques, Jr.
patent: 5695304 (1997-12-01), Ebert
patent: 5735648 (1998-04-01), Kleine
patent: 5899642 (1999-05-01), Berglöw et al.
patent: 5963775 (1999-10-01), Fang
patent: 685485 (1957-12-01), None
patent: 3623176A1 (1988-01-01), None
patent: 297 01 161 (1998-07-01), None
Bach Klaus T.
Bray W. Donald
Tiagra Hartstoff GmbH
LandOfFree
Shank-type cutter of a hard material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Shank-type cutter of a hard material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shank-type cutter of a hard material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2465938