Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Plural or complex apparatus
Patent
1996-05-28
1997-12-02
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Plural or complex apparatus
723893, 72404, 72420, B21D 502, B21D 4310
Patent
active
056924089
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/FI94/00409, filed Sep. 16, 1994.
The present invention concerns a folding press.
In prior arc a folding press As known comprising a frame fixedly supported on the base; a fixed beam, which is fixedly connected to the frame; a ram beam, supported by the frame to be movable relative to the fixed beam; a force member, disposed between the ram beam and the frame for moving the ram beam relative to the fixed beam in order to accomplish the folding work movement; a counterblade, attached to the fixed beam; a thrust blade, attached to the ram beam parallelly in relation to the counterblade, the counterblade and thrust blade constituting a pair of folding blades between which a piece of metal sheet can be folded; a many-hinged manipulation arm for clamping and handling the place which is to be folded, and for inserting it between the folding blades in a pre-determined manner. In the folding press of prior art the working stroke of the ram beam is usually vertical, whereby the throat between the blades is horizontal. Moreover, typically, a folding press of this type has only one pair of folding blades, folding of the piece of sheet being performed in the gap thereof by handling the piece of sheet by means of a manipulation arm feeding it in between the folding blades.
The problem which the folding press of prior art is that only folds of quite restricted kind can therewith be produced in the piece of sheet with one single clamping, owing to the single thruster/counter-piece pair feature. If one desires further foldings of another kind in the workplace, the manipulation arm must release the piece from its grip and the piece has to be moved to be further folded on another folding press; this implies that the setting of the piece of sheet on the manipulation arm has to be redefined. this is cumbersome and time-consuming. Another problem is that when the metal sheet is gripped by the clamping member of the manipulation arm and transported in horizontal attitude into the folding gap, the sheet will bend downward, giving rise to folding errors. Bending of the sheet during the manipulation step is also problematic for the reason that when programming of the operation is accomplished by means of computer-aided simulation, calculation of the sheet's bending is extremely difficult because air resistances etc. have to be taken into account.
The object of the invention is to eliminate the drawbacks mentioned.
Specifically the object of the invention is to disclose a folding press of completely novel type, which enables the building up of a versatile folding press line as simply as possible and with few components.
The object of the invention is further to disclose a folding press enabling with a single fixing of the sheet to the manipulation arm, folding of the sheet with two pairs of folding blades.
Further still, the object of the invention is to disclose a folding press enabling metal sheets to be folded without incurring substantially any bending of the sheets when they are being handled with the manipulation arm.
The folding press of the invention comprises a frame; a fixed beam, fixedly connected to the frame; a ram beam, supported by the frame to be movable relative to the fixed beam; a force member, disposed between the ram beam and the frame for moving the ram beam relative to the fixed beam in order to accomplish the folding working stroke; an elongated and beam-like counterblade, attached to the fixed beam; in elongated and beam-like thrust blade, attached to the ram beam parallel relative to the counterblade, the counterblade and thrust blade together forming a folding throat, or a pair of folding blades, the piece of metal sheet being foldable therebetween; and a many-hinged manipulation arm for clamping the piece to be folded and inserting it between the pair of folding blades in predetermined manner.
As taught by the invention, the folding press comprises at least two fixed beams, a first fixed beam and a second fixed beam, to which counterblades are connected, and the ram beam b
REFERENCES:
patent: 4327570 (1982-05-01), Schottker
patent: 4391119 (1983-07-01), Schmitz
patent: 4510785 (1985-04-01), Triouleyre
patent: 5099670 (1992-03-01), Sartorio
patent: 5291771 (1994-03-01), Tomo
Aliko Automation Oy
Crane Daniel C.
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