Cutters – for shaping – Rotary cutting tool – Composite body of diverse material
Patent
1995-10-16
1997-05-27
Rachuba, M.
Cutters, for shaping
Rotary cutting tool
Composite body of diverse material
407 42, 407 54, 407 62, 407114, 408228, B23C 514
Patent
active
056325762
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the US national phase of PCT application PCT/DE94/00400 filed 11 Apr. 1994 with a claim to the priority of German application P 43 12 401.1 filed 16 Apr. 1993.
FIELD OF THE INVENTION
The invention relates to a cutting plate and in particular to such a cutting plate intended for use in a ball-head finish miller used for copy milling.
BACKGROUND OF THE INVENTION
Cutting plates have been known for a long time and have a support body which is e.g. made of a hard metal. The cutting capacity of the miller depends on the quality of its cutting edge and inserts are already known which are provided with a particular cutting layer or cutting-material layer forming the cutting edge. The manufacture of these inserts with a cutting layer only a few tenths of millimeter thick is extremely expensive and therefore associated with high costs.
OBJECT OF THE INVENTION
It is an object of the invention to provide a cutting plate which is particularly usable for ball-head finish millers, which gives the ball-head finish miller a high cutting capacity, and which is generally relatively cheap to manufacture.
SUMMARY OF THE INVENTION
These objects are achieved by the invention in that at least two symmetrically arranged inserts also of hard metal and serving as supports are provided each having a cutting layer or cutting-material layer applied to it and forming the cutting edge, the inserts being arranged on opposite sides forming support faces of the cutting-plate support body.
Such a cutting plate using two inserts (blanks) and having two cutting edges is mounted on diametrally opposite sides of the head end of the ball-head finish miller. Of the two inserts on the cutting plate as a rule only the cutting edge of one insert is making contact so that a substantially longer service life can be obtained than in the known similar ball-head finish millers with only a single cutting edge.
According to further features of the invention the inserts are substantially formed as circle segments and they are mounted in substantially circularly segmental seats on the periphery of the cutting-plate support body. Except for the cutting layer or cutting-material layer forming the cutting edge, the inserts consist of the same hard metal as the cutting-plate support body so that the inserts can be e.g. soldered thereto. As a result of their circularly segmental shape the inserts are relatively small bodies and for this reason inexpensive. Meanwhile the cutting layer or cutting-material layer covers the entire welded-in piece. A partial coating is also possible.
BRIEF DESCRIPTION OF THE DRAWING
The invention is more closely described in the following with reference to an embodiment that is shown in the drawing. Therein:
FIG. 1 is a large-scale view of a cutting plate;
FIG. 2 is a view of the cutting plate taken in the direction of arrow X of FIG. 1; and
FIG. 3 is a partly broken-away side view of the end of a ball-head finish miller with an inset cutting plate also in enlarged scale.
SPECIFIC DESCRIPTION
A cutting plate 1 comprises according to the embodiment shown in FIG. 1 a cutting-plate support body 2 and two inserts 3 which each support a cutting or cutting-material layer 5 forming the cutting edge 4. The inserts 3 are as shown in FIGS. 1 and 2 mounted on support faces 6 and 7 formed on opposite sides of the cutting-plate support body 2 and are in recesses 8 which correspond in shape and size to the shape and size of the inserts 3. The recesses 8 also form chip spaces.
The inserts 3 are formed at least generally as circle segments and the recesses 8 on the periphery 9 of the cutting-plate support body 2 are similarly shaped.
The inserts 3 each have an arcuate cutting edge 4 and a secant-forming edge 10. The secantal edges 10 of the inserts 3 are arranged on the cutting-plate support body at an acute angle to each other. In addition they are arranged with their ends 11 and 12 immediately adjacent each other. Finally the segmental inserts 3 lie with their secantal ed
REFERENCES:
patent: 4251172 (1981-02-01), Storch
patent: 4623285 (1986-11-01), Costil
patent: 4883391 (1989-11-01), Tsujimura et al.
patent: 4934881 (1990-06-01), Tsujimura et al.
patent: 5348426 (1994-09-01), Krupp
Dubno Herbert
Hansen Kenneth J.
Rachuba M.
Widia Heinlein GmbH
Wilford Andrew
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