DE102015000959A1 - Apparatus and method for folding sheet metal - Google Patents

Abstract

Device (1) for folding sheet metal (3), with a support (5), designed to hold a metal sheet (3) during the chamfering, the support (5) having a terminal edge (7) adapted to bend the metal sheet Sheet (3) about the end edge (7), and with a Abkanteinrichtung (9) which is displaceable relative to the support (5) along a Abkantrichtung in an operative position and in a passive position, and wherein the Abkanteinrichtung (9) - in the direction the end edge (7) seen - a plurality of roll bending means (11) which are arranged along a predetermined bending line.

Description

The invention relates to a device and a method for folding sheet metal.

From the DE 60 2004 009 864 T2 shows a device for folding sheet metal, which has a support with which a sheet can be held during a Abkantens. The overlay has an end edge around which the sheet is bent during trimming. It is provided a Abkanteinrichtung which is displaceable relative to the support along a Abkantrichtung in an operative position and in a passive position. Such folding devices are previously used only for a linear folding, wherein the end edge extends along a straight line. In contrast, a non-linear folding is carried out in mold-lowering, which is complicated and cost-intensive.

The invention has for its object to provide a device and a method, said disadvantages do not occur.

The object is achieved by providing the subject matters of the independent claims. Advantageous designs result from the subclaims.

The object is achieved in particular by providing a device for folding sheet metal, which has a support which is adapted for holding a sheet during the chipping. The support has an end edge adapted to bend the sheet about the end edge. The device has a Abkanteinrichtung which is displaceable relative to the support along a Abkantrichtung in an operative position and in a passive position. The Abkantrichtung responds to a direction of action of the device, and thus the direction in which the Abkanteinrichtung is displaced relative to the support for folding a sheet. In this case, the Abkanteinrichtung is removed in its passive position at a greater distance from the sheet, so that it is particularly possible to remove a finished beveled sheet from the device and to arrange a new, abzukantendes sheet in the device and on the support. In the operative position, the Abkanteinrichtung is arranged closer to the support, in particular in a predetermined manner to a maximum extent on the support to move, so that the sheet is bent around by the Abkanteinrichtung to the end edge. It is possible that the support is part of a lower die of the device, wherein the Abkanteinrichtung is part of a Obergesenks. The device is characterized in that the Abkanteinrichtung - seen in the direction of the end edge - has a plurality of roll bending devices which are arranged along a predetermined bending line. In connection with the device there are advantages compared to the prior art. In particular, due to the plurality of roll bending devices, it is possible to realize not only straight bending lines but also non-linear bending lines. This only requires an offset of the roll bending devices relative to each other. Thus, almost any geometric Abkantlinien be achieved in a relatively simple manner, the device can be designed to be inexpensive and structurally simple compared to a mold die. In particular, in the device above a sheet projection region, a plurality of short roll bending devices are arranged along the predetermined bending line around which the sheet is bent.

The bending line preferably corresponds to the course of the end edge, which defines the extent of the bending geometry for the sheet.

In a preferred embodiment, it is provided that the Abkanteinrichtung is held displaceable, wherein the support is arranged fixed in space. Alternatively, it is possible that the Abkanteinrichtung is held firmly in space, the support is kept displaced. It is also possible that both the Abkanteinrichtung and the support are kept displaced. In connection with the device, it is ultimately important that a relative movement between the Abkanteinrichtung and the support is effected.

Each of the roll bending devices preferably has a solid cylinder rotatably mounted about a longitudinal axis, on which a peripheral segment is recessed, which includes approximately a right angle. Upon impact of a segment edge on a support supported area of the sheet, the cylinder rotates under the pressure of the lowering. The other segment edge is thereby pivoted in the direction of action and pushes the abzukantenden portion of the sheet in the direction of action or bends it around the end edge. After folding, the roll bending device is removed again from the support, whereby the segment edges are relieved and the cylinder by means of a return mechanism, in particular a return spring, automatically pivots back to its original position. Such roll bending devices are known per se, for example from the DE 60 2004 009 864 T2 , so that is not discussed here in detail so far.

An embodiment of the device is preferred, which is characterized in that the predetermined bending line has a non-linear course. As already indicated, the advantages of the device are realized in a special way, because instead of using a Formgesenks a cost-effective and structurally simple device can be used.

An exemplary embodiment of the device is preferred, which is characterized in that a distance of the rolling bending devices, measured in the active position and perpendicular to the end edge, can be set in groups or individually to the end edge. It is not only possible by Relativverlagern the Rollbiegeeinrichtungen relative to each other to define a predetermined, even non-linear bending line, but it is also possible to take into account along the terminal edge locally varying return behavior of the sheet by the delivery of Rollbiegeeinrichtungen relative to the terminal edge - locally considered - different bending angles are realized, which ultimately - taking into account the locally varying return behavior - leads to the fact that along the entire end edge seen a predetermined - locally or globally defined bending angle can be met.

The relevant distance of the roll bending devices to the end edge is measured in the active position. In the end, this is ultimately the distance relevant for the local bending angle and thus also the final bending angle to be achieved. The distance is also measured perpendicular to the trailing edge. It is typically defined by convention that the trailing edge itself extends in the X direction.

In one embodiment of the device, it is preferably provided that the distance between the roll bending device and the end edge is adjustable perpendicular to the end edge and at the same time perpendicular to the effective direction. The effective direction is conventionally referred to as the Z direction. In the embodiment shown here, the distance thus extends perpendicular to the X-direction and at the same time perpendicular to the Z-direction. It thus extends in the Y direction.

Alternatively, it is possible in one embodiment of the device that the distance perpendicular to the end edge and parallel to the effective direction, ie by convention in the Z direction, is adjustable. It is thus - seen in the effective direction - set a height of the roll bending devices on the support in the operative position.

Both a Y-direction adjustment and a Z-direction adjustment of the distance lead to a variation of the bending angle. If the sheet metal has a locally different return behavior and if a local bending angle is matched to this, a constant overall bending angle can ultimately be achieved in particular.

It is also an embodiment of the device possible, which is characterized in that the distance is both perpendicular to the effective direction and parallel to the effective direction, ie in both the Y and in the Z direction, adjustable. This device is particularly flexible adjustable. In particular, thus a diagonal distance in the Y-Z plane to the end edge is adjustable.

According to one embodiment of the device, the roll bending devices are adjustable in groups with respect to the distance to the end edge. This may in particular be sufficient if the return behavior of the sheet along the end edge changes only slightly. However, in particular with larger changes in the return behavior of the sheet per unit length along the end edge, it is advantageous if the spacing of the roll bending devices for each roll bending device is individually adjustable. Particularly preferably, the distance for all roll bending devices is independently adjustable. The distance between a roll bending device thus does not depend in any way on the distance of the other roll bending devices from the end edge. Rather, a separate distance is separately adjustable for each roll bending device.

An embodiment of the device is also preferred, which is characterized in that the support has a support surface and a stop surface, wherein the end edge is formed by a transition region from the support surface into the stop surface. The transition region is formed in particular as an imaginary cutting line between the support surface and the abutment surface, wherein this cutting line is preferably rounded, so that there is a definite bending radius at the end edge. The abutment surface preferably includes an angle with the support surface, which is different from 90 °. In particular, the angle is preferably less than 90 °, so that an overbending of the sheet is possible. Only then is it possible to represent bending angles of 90 ° or less despite the return behavior of the sheet.

An embodiment of the device is also preferred, which is characterized in that it comprises at least one shim or at least one tuning wedge, by means of which the distance between the roll bending devices and the terminating edge can be adjusted. Preferably, a plurality of shims and / or tuning wedges are provided, in particular for each roll bending device at least one shim or at least one tuning wedge. With the help of a kit of differently designed shims or tuning wedges or by combination, in particular series connection of a plurality of shims or tuning wedges can be set a variety of different distances for the roll bending devices.

The object is also achieved by providing a method for folding sheet metal using a device according to one of the previously described embodiments. The method comprises the following steps: A sheet is placed on the support so that a bending area of the sheet projects beyond the end edge. The Abkantbereich is that portion of the sheet to be bent or folded. The Abkanteinrichtung is displaced in the effective direction from the passive position into the active position, and the Abkantbereich the sheet is bent around the end edge. In connection with the method - in particular due to the use of a device according to one of the previously described embodiments - realize the advantages that have already been explained in connection with the device.

Overall, in the context of the method, a metal sheet is preferably placed on the support designed as a solid base, the bending area projecting beyond the support and in particular over the terminal edge. Subsequently, the Abkanteinrichtung and thus at the same time the Rollbiegeeinrichtungen is lowered onto the sheet in the Abkantbereich. It then takes place folding according to the above-described operation of the roll bending devices. After folding, the Abkanteinrichtung is preferably relocated together with the roll bending back into the passive position, whereby the segment edges of the roll bending devices are relieved, and wherein the cylinders turn back by means of the return automatically to their original positions.

An embodiment of the method is also preferred, which is characterized in that a sheet metal is bent, the bending area of which - prior to folding - has an edge with a geometry corresponding to the bending line. The edge of the abzukantenden sheet can thus already have the corresponding line geometry. It then requires in particular no post-processing of the sheet. It also results in particularly good Abkantergebnisse.

An embodiment of the method is preferred, which is characterized in that a bending angle distribution along the end edge is determined, wherein the distances of the roll bending devices are adjusted to the end edge corresponding to the bending angle distribution. The bending angle distribution indicates how far the bending area has to be locally bent in order to achieve a predetermined desired bending angle, taking into account the return behavior of the sheet. By determining the bending angle distribution and the corresponding setting of the distances of the roll bending devices, a desired set bending angle can thus ultimately be realized along the entire length of the closing edge and thus along the entire length of the bending region of the sheet metal.

An embodiment of the method is also preferred, which is characterized in that a return behavior of the sheet along the end edge is determined, wherein the bending angle distribution is determined on the basis of the return behavior. In particular, a desired bending angle for the Abkantbereich - either in the form of local desired Abkantwinkel or particularly preferably in the form of a global target Abkantwinkels, which is to be observed along the entire Abkantbereichs - defined. It then determines the local return behavior of the sheet, and the bending angle distribution is determined so that it is tuned to the local return behavior of the sheet, that everywhere the local or the global target Abkantwinkel is achieved when the sheet set according to the bending angle distribution Distances of the roll bending devices is bent by the device. The roll bending devices are thus delivered differently close to the sheet according to the previously determined bending angle distribution, so that this is ultimately bent locally different degrees, so that sets the desired bending angle after the jump.

Finally, an embodiment of the method is preferred, which is characterized in that a right-angled bending angle is set along the entire end edge. This represents a particularly preferred embodiment of the method, wherein in particular a right-angled bending angle is relevant for practical applications.

In the context of the method, by the way, preferably sheets are bent, the Abkantbereich - measured along the end edge - is longer than 1000 mm, in particular, a Abkantlänge is more than 1000 mm. With the help of the method, it is also possible with such long components to comply with required dimensional tolerances, in particular of +/- 0.5 mm.

The description of the device and the method are to be understood as complementary to each other. Features of the device that have been explained explicitly or implicitly in connection with the method are preferably individually or combined with one another Features of a preferred embodiment of the device. Procedural steps that are explicit or implicit in connection with the Device described are preferably individually or combined with each other steps of a preferred embodiment of the method. This is preferably characterized by at least one method step, which is due to at least one feature of the device. The device is preferably characterized by at least one feature, which is due to at least one step of a preferred embodiment of the method.

The invention will be explained in more detail below with reference to the drawing.

Showing:

1 a schematic representation of an embodiment of the method, and

2 a schematic representation of an embodiment of the device.

1 shows a schematic representation of an embodiment of the method for folding sheet metal. In this case, a) is a device 1 shown, for folding the sheet 3 is set up. The device 1 has a circulation 5 on which the sheet metal 3 can be imposed, with the edition 5 a final edge 7 has to which the sheet metal 3 bent when folding. In addition, the device 1 a Abkanteinrichtung 9 on, relative to the edition 5 in a departure direction, the in 1 vertically, thus in the direction of action of the device 1 , Is displaced from a passive position, not shown, in an operative position shown at c). In the passive position is the Abkanteinrichtung 9 further from the edition 5 or the sheet metal 3 arranged away as shown at a).

The Abkanteinrichtung 9 points - towards the end edge 7 seen here perpendicular to the image plane of 1 extends - a plurality of roll bending devices, in which case only one roll bending device 11 is shown schematically.

For folding the sheet is 3 on the edition 5 placed, specifically on a support surface 13 the same. The sheet stands with a Abkantbereich 15 over the trailing edge 7 above.

The roll bending device 11 has one perpendicular to the image plane of 1 standing rotary axis rotatable solid cylinder 17 on, in a cylinder 19 is pivotally mounted. On the solid cylinder, a peripheral segment is recessed, wherein the solid cylinder 17 On both sides of the recessed segment has segment edges, namely, a support-side segment edge 21 and a pad-removed segment edge 23 ,

Is that sheet? 3 on the pad 5 arranged, the Abkanteinrichtung 9 lowered from its passive position along the bending or effective direction until - as in 1a) shown - the bearing-side edge of the segment 21 on the by the edition 5 supported area of the sheet 3 incident. The Abkanteinrichtung 9 is then lowered further, the solid cylinder 17 is pivoted, and wherein in particular the pad-removed segment edge 23 is pivoted in the direction of action, as in 1b) is shown. This presses the Abkantbereich 15 - seen in the lowering direction - down and bends it around the trailing edge 7 ,

In 1c) is the active position of the Abkanteinrichtung 9 shown. Here is the solid cylinder 17 completely pivoted, and according to the embodiment of the method concretely illustrated here, the Abkantbereich 15 in the direction of a stop surface 25 is urged. This is the Abkantbereich 15 preferably not completely against the stop surface 25 crowded, but remains between the sheet 3 and the stop surface 25 - Deviating from the schematic, simplified representation according to 1c) - Always a free space of preferably at least one plate thickness of the sheet 3 , After the so-made bending the Abkanteinrichtung 9 shifted back towards their passive position, which ultimately both edges of the segment 21 . 23 be relieved, the solid cylinder 17 by means of a return mechanism 27 is automatically moved back to its original position.

By means of known devices of the type mentioned here, no non-linear bending lines can be represented, but molding dies are used for this purpose.

The sheet 3 shows when folding also a return behavior, with the Abkantbereich 15 starting from the initially reached position of the stop surface 25 away. This rebound behavior is locally different, especially with high-strength and / or long sheets with - seen in the direction of the end edge - long Abkantbereich locally, so that the folding with a single, long Rollbiegeeinrichtung 11 dimensionally inadequate.

The device 1 Therefore, as seen along the trailing edge, has a plurality of roll benders 11 on, which are arranged along a predetermined, in particular non-linear bending line. In this way, non-linear bending lines are easy and inexpensive to implement.

One in the operative position and perpendicular to the trailing edge 7 measured distance of the roll bending devices 11 to the end edge 7 is preferably in groups or individually - in particular independently of each other - adjustable. In this way, also a locally different return behavior of the sheet 3 Be taken into account.

The bearing surface 13 and the stop surface 25 preferably enclose an angle α with each other that is different from 90 °, as in 1 is shown. In particular, this angle α is preferably less than 90 °. The closing edge 7 runs preferably along an imaginary line of intersection between the support surface on the one hand and the stop surface 25 on the other hand, preferably rounded.

2 shows a schematic representation of an embodiment of the device 1 , Identical and functionally identical elements are provided with the same reference numerals, so that reference is made to the preceding description. Here is the final edge 7 schematically represented by a dashed line. It turns out that these along a predetermined, non-linear bending line for the sheet 3 extends, in particular having the shape of a circular or circular section line. Along the trailing edge 7 Here is a plurality of roll bending devices 11.1 to 11.9 arranged, which follow the course of the bending line or are aligned with respect to the bending line. This alignment is possible because just not a single, elongated roll bending device 11 but rather a plurality of such roll benders 11.1 to 11.9 which are individually and separately alignable. In this way, almost any geometric bending lines can be realized.

In addition, it is possible to use the individual roll bending devices 11.1 to 11.9 with respect to one in the operative position and perpendicular to the trailing edge 7 - In particular locally - measured distance to the end edge 7 in groups or individually, in particular independently. In this case, the distance perpendicular to the end edge 7 and perpendicular to the effective direction - thus in the image plane of 2 -, or the distance perpendicular to the end edge 7 and parallel to the effective direction, thus perpendicular to the image plane 2 to be discontinued. A combination of these settings is conceivable, in which case in particular results in a diagonal setting. It turns out that with greater distance larger bending angles are realized, with a smaller distance smaller bending angle, namely a larger bending of the sheet around the trailing edge 7 to be realized. This can be a safe and reproducible if possible with a result of a constant bending angle along the entire length of the Abkantbereichs a locally different return characteristics of a particular sheet with a long Abkantbereich, preferably with a Abkantbereich with a length of over 1000 mm 15 Be taken into account.

In particular, it is preferred first to return the sheet 3 along the trailing edge 7 determines, then a bending angle distribution is determined based on the return behavior. The distances of the roll bending devices 11 to the end edge 7 are adjusted according to the determined bending angle distribution, and preferably so that everywhere along the trailing edge 7 after folding the sheet - due to the different bending and the different return behavior - gives a homogeneous, constant bending angle. In this case, a right-angled bending angle is particularly preferably set.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 602004009864 T2 [0002, 0008]

Claims (10)

Contraption ( 1 ) for folding sheet metal ( 3 ), with - an edition ( 5 ) arranged to hold a sheet ( 3 ) during the chamfering, whereby - the overlay ( 5 ) an end edge ( 7 ) which is adapted to bend the sheet ( 3 ) around the trailing edge ( 7 ), and with - a Abkanteinrichtung ( 9 ) relative to the edition ( 5 ) is displaceable along a direction of departure into an operative position and into a passive position, characterized in that - the Abkanteinrichtung ( 9 ) - in the direction of the trailing edge ( 7 ) - a plurality of roll bending devices ( 11 ) arranged along a predetermined bending line. Contraption ( 1 ) according to claim 1, characterized in that the predetermined bending line has a non-linear course. Contraption ( 1 ) according to any one of the preceding claims, characterized in that a measured in the active position and perpendicular to the end edge distance of the roll bending devices ( 11 ) to the trailing edge ( 7 ) is groupwise or individually adjustable. Contraption ( 1 ) according to one of the preceding claims, characterized in that the support ( 7 ) a bearing surface ( 13 ) and a stop surface ( 25 ), wherein the end edge ( 7 ) by a transition region from the support surface ( 13 ) in the stop surface ( 25 ) is formed, wherein the stop surface ( 25 ) an angle with the support surface ( 13 ) other than 90 °. Contraption ( 1 ) according to one of the preceding claims, characterized in that the device ( 1 ) Shims ( 29 ) or tuning wedges, by which the distance of the roll bending devices ( 11 ) from the end edge ( 7 ) is adjustable. Method for folding sheet metal ( 3 ) using a device ( 1 ) according to one of claims 1 to 5 with the following steps: - placing a sheet on the support ( 5 ), so that a Abkantbereich ( 15 ) over the trailing edge ( 7 ) survives; - Relocation of the Abkanteinrichtung ( 9 ) in the effective direction from the passive position into the active position, and - bending the Abkantbereichs ( 15 ) around the trailing edge ( 7 ). Method according to claim 6, characterized in that a sheet ( 3 ) is folded, whose Abkantbereich ( 15 ) has an edge with a geometry corresponding to the bending line. Method according to one of claims 6 and 7, characterized in that a bending angle distribution along the end edge ( 7 ), wherein the distances of the roll bending device ( 11 ) to the trailing edge ( 7 ) are adjusted according to the bending angle distribution. Method according to one of claims 6 to 8, characterized in that a return behavior of the sheet ( 3 ) along the trailing edge ( 7 ) is determined, wherein the bending angle distribution is determined on the basis of the return behavior. Method according to one of claims 6 to 9, characterized in that a right-angled bending angle along the entire end edge ( 7 ) is set.

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