Metal deforming – With use of control means energized in response to activator... – Including use of sensor responsive to information carried by...
Patent
1995-03-13
1997-04-22
Crane, Daniel C.
Metal deforming
With use of control means energized in response to activator...
Including use of sensor responsive to information carried by...
72336, 72339, 83 36, 83 39, 83713, 83923, 83 761, B21D 2804, B21D 2820
Patent
active
056220685
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/SE93/00820, filed Oct. 11, 1993.
The present invention relates to a method of producing plate components of varying size and shape from a flat sheet of metal having a thickness of from 0.1 to 20 mm which is displaced stepwise in its plane through at least one press for at least two metal working operations to be performed comprising a first cutting operation to separate the plate components from the sheet of metal, and a second cutting operation, separate from the first cutting operation, to remove scrap formed at the first cutting operation, said press being of the type having an upper tool stand for first parts of at least two metal working tools for said two metal working operations, and a lower tool stand for other complementary parts of each metal working tool so that the upper and lower tool stands define a space between them for free insertion of the metal sheet in its direction of feed, said space having a depth in horizontal direction that is Greater than the dimension of one plate component measured perpendicular to said direction of feed, the metal sheet having an original dimension perpendicular to said direction of feed that is several times greater than the plate component measured in the same direction. The invention also relates to a sheet metal working machine for producing plate components of varying size and shape from a flat sheet of metal having a thickness of from 0.1 to 20 mm, comprising at least one press having an upper tool stand for first parts of at least two metal working tools and a lower tool stand for other complementary parts of each metal working tool, these tool stands defining a space between them for free insertion of the metal sheet in its direction of feed, said space having a depth in horizontal direction that is greater than the dimension of one plate component measured perpendicular to said direction of feed, the metal sheet having an original dimension perpendicular to said direction of feed that is several times greater than the plate component measured in the same direction, which metal working tools are arranged to perform first and second cutting operations to separate the plate components from the metal sheet or to separate scrap, the machine also comprising a feeding device with gripping means to firmly retain the metal sheet and to move it stepwise in relation to the press, and a horizontal table located in a plane with the upper surface of the lower tool stand containing said other complementary tool parts.
Plate components are usually produced from a continuous metal strip which is supplied from a coil to a punching machine by means of a roller feeder located immediately before the punching machine. The width of the metal strip is selected depending on the size of the plate components to be produced, in order to reduce waste in the sheet metal remaining after the components have been punched out. This method is used primarily when large series of components of the same type are to be cut. However, it is unsuitable for smaller series of identical plate components since for reasons of cost and space a large assortment of coils of metal strip of different widths cannot be maintained and a coil of metal strip of the desired width for a particular plate component may not be available at the time the client places his order. The described method using metal strip on coils thus means that the price per unit becomes too high for small series and sometimes even for medium-sized series of identical plate components, or different plate components with similar dimension except for the wall thickness in the initial work operation. Two different techniques are used in order to reduce the unit price for small and medium-sized series of plate components, both of which start with plate in the form of a rectangular sheet of standard format, known as "cut-to-size sheet metal". According to one of these techniques the cut-to-size sheet is cut into a plurality of identical rectangular strips, the width of which adapted to the relevant plate co
REFERENCES:
patent: 2458538 (1949-01-01), Socke
patent: 3589221 (1971-06-01), Deegan
patent: 3760623 (1973-09-01), Hempelmann
patent: 4682401 (1987-07-01), Tadashi et al.
patent: 5123271 (1992-06-01), Sofy
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