Metal deforming – With cutting – By composite tool
Patent
1989-08-15
1991-11-26
Crane, Daniel C.
Metal deforming
With cutting
By composite tool
72327, 83620, 83686, B21D 2814, B26F 144
Patent
active
050673394
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a cutting and forming tool for complicated flat structures. The cutting and forming tool includes a tool upper part with a cutting stamp and a tool lower part with a cutting plate.
BACKGROUND ART
Tools of this kind are generally known, and are used in the cutting out and forming of large surface metal sheets and multilayer formed plates. In the known tools for large surface plates, a cutting stamp and a cutting plate are designed as frames. Such frame form cutting stamps and cutting plates are difficult to produce, especially in complicated cutting forms. Because of the required precision, they usually include a single piece. Hardening of the single piece or subsequent effects of temperature on the single piece leads to distortion of the cutting edge. In case of damage to individual parts of the cutting edge, often the whole tool must be replaced and repairs are time consuming and expensive. Cutting edges which do not lie in one plane, but rather which follow a spatial form in three dimensions, can only be produced with very great expense and correspondingly equipped tool machines.
SUMMARY OF THE INVENTION
The problem of the present invention is to provide a cutting and forming tool with which complicated flat structures in the form of metal sheets or formed plates can be perfectly finished, and to provide even cutting edges which follow a three dimensional spatial form and which can be produced simply. Another problem of the invention is to find a new structure for the cutting stamp and the cutting plate so that the production, finishing, and repair of the cutting edges are simplified and more economical.
This problem is solved by the fact that the cutting plate and the cutting stamp includes a plurality of cylindrical cutting elements of polygonal cross-section lined up one after the other in the zone of the cutting line. Each of the cutting elements has a cutting edge in the first end surface. These cutting edges of the individual elements form the cutting line. The second end surface and the adjoining end portion of each individual cutting element are anchored into the cutting plate or cutting stamp.
In a further development of the invention, a cutting element each in the upper part of the tool and the lower part of the tool form a pair. The axes of these two cutting elements coincide, and the end surfaces with the cutting edges are directed toward each other. Another improvement of the tool may be obtained by the fact that the cutting elements have a hexagonal cross-section. An offset in steps with a cutting surface is formed at the zone of the first end surface. The cutting edge of one angle of the hexagon runs through the axis of the angle lying opposite.
In the cutting stamp and the cutting plate are arranged openings corresponding to the course of the cutting line. The individual cutting elements are set into these openings, while the cutting edges of the abutting or lined-up cutting elements are directed toward each other and form a cutting edge approximately at the cutting line. In principle, even cutting elements of triangular cross-section may be used. However, cutting elements of hexagonal cross-section have been found especially suitable since these are symmetrically formed and can be approximated to any curvature of the cutting line. Very strong curvatures are produced if the cross-sectional area of the individual elements is reduced, and thus smaller radii are possible. With this, the cutting edges of the cutting elements in the lower part and the upper part of the tool fit exactly together. A cutting element each in the lower and the upper part of the tool is assembled to a pair. Their axes are arranged to coincide, and the end surfaces with cutting edges are directed toward each other. The cutting elements in the cutting stamp or the cutting plate are anchored by means of known possibilities, for example, with clamping wedges, with screws or with glue. In a further development of the invention, the cross-section of the cutting element of th
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AAW Producktions Aktiengesellschaft
Crane Daniel C.
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