Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Clamp structure constitutes sole initial metal-deforming...
Patent
1992-03-25
1993-11-09
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Clamp structure constitutes sole initial metal-deforming...
72307, B21D 504
Patent
active
052592316
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a swivel bending machine for a metal sheet.
With the known sheet metal bending machines which have hitherto been used to perform such a process, the bending jaw is only usable in one working direction, i.e., for example, during swivel movement from the bottom upwards in the clockwise direction. Consequently, for sheet metal bending in opposite directions, i.e., when a first sheet metal section is to be bent, for example, in the clockwise direction and subsequently a further sheet metal section in the counter-clockwise direction, the metal sheet has to be turned between the individual bending operations. However, particularly when large metal sheets of several meters length have to be turned so that their top side becomes the bottom side, this is an inconvenient and time-consuming operation which is often also impeded by automatic handling devices provided on the sheet metal bending machine.
The object of the invention is to so improve a generic process that turning of the metal sheet between two two-directional bending operations can be avoided.
A swivel bending machine comprising machine frame, lower jaw, upper jaw and bending jaw for performing the process according to the invention is characterized in that there is provided on each of the two end faces of the bending jaw a first swing arm which can be swivelled about the swivel axis of the bending jaw, in that there is movably mounted on the first swing arm a second swing arm, and in that there is provided on the second swing arm a guide means which permits an essentially straight-line movement of the bending jaw extending perpendicular to the swivel axis, the bending jaw itself extending essentially perpendicular to the direction of movement of the second swing arm.
The following description of preferred embodiments serves in conjunction with the appended drawings to explain the invention in further detail. The drawings show:
FIGS. 1 to 8 several subsequent steps in the two-directional bending of a metal sheet and
FIG. 9 a device for performing two-directional sheet metal bending according to FIGS. 1 to 8.
FIG. 10 is a view similar to FIG. 9 illustrating another embodiment.
FIGS. 1 to 8 each show schematically the main parts of a swivel bending machine, namely a lower jaw 1, an upper jaw 2 and a bending jaw 3. The bending jaw 3 is mounted for rotation on the machine frame (not illustrated) and can be swivelled about a swivel axis S extending perpendicular to the drawing plane in FIGS. 1 to 8.
A metal sheet 4 is clamped between lower jaw 1 and upper jaw 2 by lowering the upper jaw 2 in the direction of the arrow A and protrudes with a sheet metal section 5 beyond the jaws 1, 2. The bending jaw 3 engages with its upper or bending surface the underside of the sheet metal section 5. This side is also referred to hereinafter as the first side of the metal sheet 4; it lies opposite the top or second side of the metal sheet 4.
FIG. 1 represents the initial state of the bending process. In a first bending step, the bending jaw 3--cf. FIG. 2--is swivelled upwards (arrow B) through 90.degree. in the counter-clockwise direction, whereby the sheet metal section 5 is likewise bent upwards in the counter-clockwise direction. The bending jaw 3--cf. FIG. 3--is now withdrawn in a first direction of adjustment (arrow C) perpendicular to its swivel axis S from the bent sheet metal section 5 so that--cf. FIG. 4--it can be swivelled further upwards (arrow D) in an unimpeded manner around this bent sheet metal section 5 until after swivelling through a total of approximately 180.degree. it faces the second or top side of the metal sheet 4. The swivelling of the bending jaw 3 according to FIG. 4 again takes place about its swivel axis S. As is further evident from FIG. 4, the bending jaw 3 is now located above the upper jaw 2 clamping the metal sheet 4 so that upon perpendicular lowering from this position, the bending jaw 3 would come into contact with the upper jaw 2 and not the metal sheet 4. Proceeding from the position according to FIG. 4, the b
REFERENCES:
patent: 4768367 (1988-09-01), Favrin
Crane Daniel C.
Reinhardt Maschinenbau GmbH
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