EP1324841B1 - Device for bending a line of material - Google Patents

Abstract

The invention relates to a method and a device for bending a line of material (1), especially metal in trapezoidal form, to be used as the web material for welded web profiles. Said method is suitable for bending a line of material (1) using a clamping device (2,3) and a bending device (8,15). Said clamping device fixes the line of material in place, while the bending device effects a bending motion into a bent position and then a return motion, the bending motion being different from the return motion.

Description

The invention relates to a device for bending a material web, in particular metal strip in trapezoidal shape, which is intended for example as a web material for welded web profiles (see, for example, DE-A-2 025 722).

In this case, the material web preferably consists of a steel strip, but other materials such as aluminum, metal alloys and plastics, which can preferably be welded or glued, conceivable.

As already known and described in particular in DE 37 36 394 A1, there are devices for bending metal strip. In each case, two relatively movable jaw pairs are provided, each pair of jaws associated with a pivotable about the horizontal axis Biegebacke and between the two pivotable bending jaws, this opposite a support jaw is arranged, which supports the band material to be bent between the bending jaws to to get the desired trapezoidal shape.

In practice, it has been shown that with this known bending device only relatively flat trapezoidal webs can be formed because you pivot the pivotally mounted bending jaws only by a limited angle against the band material to be deformed can. If this limit angle is exceeded, the pivotally mounted bending jaws can no longer be pivoted back into the starting position after the bending operation, since the bending jaws displaced relative to one another during the bending process would hinder each other during pivoting back. The length of the legs or flanks of the trapezoidal webs and the opening width of the trapezoidal profile are interdependent in the known arrangement.

Also, this known bending device is limited by a certain size of the tools used for the bending operation, that is, you can not retrofit such a device to other tool sizes.

The invention has for its object to provide a device for bending a material web, in particular a steel strip, for example in trapezoidal shape, with which or with which one profiles with steeper legs or flanks of trapezoids or the like and Trapeze or the like with different opening widths and machine can bend without manual work.

As a solution, the invention proposes a device for bending a material web with a clamping device and a bending device. The bending device comprises at least one bending punch, which is guided in a working stroke and in a return stroke on deviating webs, and the at least one bending punch is mounted both arcuately for the working stroke and linearly displaceable.

In one development of the invention, the at least one bending punch can be mounted both circularly for the working stroke and linearly displaceable.

This bending punch can be arranged above the material web and, for example, by pivoting down into the bending position, bend the material web into a desired shape. The bending movement is synonymous with a working stroke of the punch. The bending position here describes a reversal position, followed by the return movement followed. The return movement is hereby equivalent to the return stroke of the punch.

Here, the material web to be deformed can be fixed, for example, by at least one jaw pair in the device, so that the material web is held in a defined position during the corresponding bending process. Here, the jaw pair be arranged such that there is at least one jaw above the material web and at least one second jaw below the material web.

As a further solution, the present invention proposes a method in which for bending a material web by means of a clamping device and a bending device, the clamping device fixes the material web and the bending device undergoes a bending movement into a bending position and then a return movement, wherein the bending movement deviates from the return movement.

To obtain cross-sectional shapes such as trapezoidal shapes with steeper legs or flanks and also deeper trapezoids and the like, the bending device passes through a bending movement into the bending position. By a suitable choice of the bending movement, bending radii of the bent metal sheets can be kept, which preclude an unfavorable change in the microstructure of the metal in the bending region.

In a first embodiment, the material web may also be fixed to the web-feed side by a second pair of jaws, which may be arranged in a similar manner to the first pair of jaws. Here, the pair of jaws, which acts on the materialbahnzuführenden side, are moved relative to the first jaw pair, so as to compensate for a shortening caused by the bending in a simple manner. For example, such a bending punch arranged between the jaw pairs perform two bending operations in one working stroke.

In a further embodiment, a first jaw pair is provided, which fixes the material web. In this case, the bending device differs in that not only above the material web a bending punch is arranged, but that a second bending punch is arranged under the material web. In this device variant, the upper bending punch first moves into a bending position, so that it fixes the material web with its tool against a shoulder of the clamping device or a further lower clamping jaw. Then moves the lower punch also in a bending position, so that the tool of the lower punch the web against a shoulder of the upper punch clamps and the upper punch is thus used in this second bending operation as part of the clamping device. In this variant can be dispensed with a second pair of jaws, which can be beneficial to the cost of construction and maintenance of the device affect.

The deviation according to the invention between bending movement and return movement requires that these two movement sequences can be optimized and in particular be optimized independently of one another.

Due to the deviation in the path of the bending punch in the bending movement and the return movement, it comes after the deformation or bending operation no longer to the mutual obstruction of the bending tools, as is the case in the described prior art.

In contrast to the bending movement, which passes through an example, almost circular path, the bending punch in the return movement preferably passes through a linear movement section perpendicular to the material web, which can be done much more space-saving.

In order to be able to exert a force of sufficient magnitude on the bending punch of the bending device with minimal structural complexity, each bending punch can be provided with its own drive. In this case, for example, each bending punch articulated, preferably by a Double joint, connected to that jaw, which lies on the same side of the material strip and corresponds to the bending punch.

So that the bending device can be used in many ways, at least one bending punch can be made exchangeable, wherein the bending punch as well as the clamping jaws can be provided with clamping or bending-specific tools. These tools are preferably also interchangeable, so that the bending device can also be meaningfully redesigned thereby.

According to a further preferred feature of the invention, the clamping device and the bending device on at least one bending edge, which are guided to each other such that during a bending movement section at least one free material portion is present.

The fact that at least one free material section is present during the bending movement section advantageously results in that the bending punches can be guided on almost any path. As a result, since the bending punches have a much higher degree of freedom of movement than in a fixed predetermined arrangement, almost any shapes can be produced.

Further advantages, objects and features of the present invention will be apparent from the description of the attached drawings in which an apparatus for bending a material web is shown by way of example.

• Figur 1 eine erste Ausführungsform einer Vorrichtung zum Biegen einer Materialbahn mit in der Ausgangsposition befindlichen Klemm- und Biegeeinrichtung,
• Figur 2 eine Ansicht der Vorrichtung aus Figur 1, bei der sich die Klemmeinrichtung in einer Klemmposition befindet,
• Figur 3 eine Ansicht, bei der der obere Biegestempel in die Biegeposition bewegt worden ist,
• Figur 4 eine Ansicht, bei der auch der untere Biegestempel in die Biegeposition bewegt wurde,
• Figur 5 eine Ansicht der Vorrichtung aus Figur 1, bei der sowohl die Klemmbacken der Klemmeinrichtung als auch die Biegestempel der Biegeeinrichtung nach Beendigung eines Biegeprozesses vom trapezförmig gebogenen Abschnitt der Materialbahn zurückgezogen wurden, um den zuletzt verformten Abschnitt der Materialbahn für den nächsten Biegevorgang aus dem Bereich der Biegeeinrichtung in die in Figur 1 gezeigte Position verschieben zu können,
• Figur 6 eine zweite Ausführungsform der erfindungsgemäßen Vorrichtung vor Beginn eines Biegeprozesses,
• Figur 7 eine Ansicht der Vorrichtung aus Figur 6, bei der sich die Klemmbacken und der Biegestempel in einer Ausgangsposition für einen neuen Biegeprozess befinden,
• Figur 8 eine Ansicht der Vorrichtung aus Figur 6, bei der sich sowohl die Klemmbacken der Klemmeinrichtung als auch der Biegestempel der Biegeeinrichtung in der Biegeposition befinden,
• Figur 9 eine Ansicht der Vorrichtung aus Figur 6 nach Beendigung eines Biegeprozesses, woraus zu erkennen ist, wie die Biege- und Klemmeinrichtung in ihrer Ausgangsposition für einen nächsten Biegeprozess verfahren werden, und
• Figur 10 eine Ansicht der Vorrichtung aus Figur 6, wobei die Klemm- und die Biegeeinrichtung sich in einer Position befinden, welche ein Nachschieben eines noch nicht verformten Materialbahnabschnittes ermöglicht.

Showing

• FIG. 1 shows a first embodiment of a device for bending a material web with a clamping and bending device located in the starting position,
• FIG. 2 shows a view of the device from FIG. 1, in which the clamping device is in a clamping position,
• Figure 3 is a view in which the upper punch has been moved to the bending position,
• FIG. 4 shows a view in which the lower bending punch has also been moved to the bending position,
• Figure 5 is a view of the device of Figure 1, in which both the clamping jaws of the clamping device and the bending punch of the bending device after completion of a bending process were retracted from the trapezoidal curved portion of the web to the last deformed portion of the web for the next bending process from the area to be able to move the bending device into the position shown in FIG. 1,
• FIG. 6 shows a second embodiment of the device according to the invention before the beginning of a bending process,
• FIG. 7 shows a view of the device from FIG. 6, in which the clamping jaws and the bending punch are in a starting position for a new bending process,
• 8 shows a view of the device from FIG. 6, in which both the clamping jaws of the clamping device and the bending punch of the bending device are in the bending position, FIG.
• Figure 9 is a view of the device of Figure 6 after completion of a bending process, from which it can be seen how the bending and clamping device are moved in its initial position for a next bending process, and
• Figure 10 is a view of the device of Figure 6, wherein the clamping and the bending device are in a position which allows Nachschieben a not yet deformed web portion.

In the illustrated in Figure 1 to 5 embodiment of the device for bending a material web 1 in trapezoidal shape, an upper jaw 2 and a lower jaw 3 is provided, which are arranged interchangeably to a carriage 4 and 5, respectively, against jaws of different size and / or change shape if necessary can. The two slides 4 and 5 are perpendicular to the continuous material web 1 adjustable, as indicated by a double arrow 6 and 7 respectively.

On the upper slide 4, an upper bending punch 8 is mounted by means of a double joint, which can be adjusted by means of a separate drive from the upper slide 4 of FIG. 1 in the position shown in solid lines in the position shown in broken lines. In the present context, the lower position is to be referred to as the bending position and the upper position as the return position. The upper bending punch 8, like the carriage 4, is preferably adjustable perpendicular to the passage direction of the material web 1, as indicated by a double arrow 9.

In the embodiment according to Figures 1 to 5, provided for the bending process lower end 10 of the upper punch 8 is wedge-shaped to bend the web 1 into the trapezoidal shape shown in the drawing can. In this case, each angle up to 90 ° between the legs 12 and flanks and the straight sections 13 of the trapezoid 11 can be selected, with only the shape of the bending punch used needs to be placed on the desired cross-sectional shape of the trapezoid or the trapezoidal profile.

Above the provided for the bending process lower end 10 of the upper punch 8 a block-shaped stop 14 is arranged laterally on this, which serves as an abutment for a lower punch 15, which will be described below with respect to training and function in more detail.

At the opposite side of the stop 14 of the upper punch 8 is provided with two spaced superimposed bearing plates 16 and 17, to each of which a lever 18 and 19 pivotally mounted about a pin 20 and 21 and thus articulated at one end. The lever 18 and 19 is also hinged at its respective other end about a pin 22 and 23, which in turn is fixed to a bearing plate 24 and 25 of the carriage 4. Therefore, perpendicular to the continuous plane of the material web 1 adjustable slide 4 and the preferably perpendicular to the continuous plane of the material web 1 adjustable upper bending punch 8 relative movements to each other run like a pendulum swingarm, as can be seen from Figures 1 to 5. Within certain limits, both the slide 4 and the upper punch 8 can be independently against the web 1 and also withdraw from this.

The lower bending punch 15 is mounted in the same way as the upper bending punch 8, namely via mutually parallel levers 26 and 27, which are arranged between the lower punch 15 Bearing plates 28 and 29 and mounted on the lower carriage bearing plates 30 and 31 are pivotally mounted by means of pins 32 and 34 and 33 and 35 respectively.

It is understood that the levers 18, 19, 26 and 27 do not necessarily have to be chosen the same length. Rather, depending on the desired trapezoidal shape or according to the desired sequence of movements, these lever lengths can be varied.

The upper end 36 of the lower punch 15 is formed in the same way as the lower end 10 of the upper punch 8 wedge-shaped and cooperates in the opposite position with the opposite block-shaped stop 14 of the upper punch 8 in the manner of a clamping connection. In this case, a movement of the bending punch 8, 15 in the direction of deformation of the material web 1 (in the drawing from right to left) corresponding to the shortening of the length of the material web 1 due to a bending step is possible.

The lower jaw 3 has an upstanding rectangular web 37, which serves as a jaw and actually forms a bending edge. The width of this web 37 is placed on the end faces 38 and 39 of the upper punch 8 and the lower punch 15, in order to bend a uniform trapezoidal 11 can.

The lower jaw 3 is provided with a shoulder 40 (see Figures 2 to 5) which serves as an abutment for the lower end 10 of the upper Bending punch 8 is used, as can be seen in particular from the individual process steps demonstrating Figure 2 to 5.

From Figure 2 it can be seen that at the beginning of a bending process, first the lower jaw 3 and the upper jaw 2 are moved together, with the upper jaw 2 on the upper straight sections 13 of the already formed trapezoid and the web 1 sets, while the rectangular Web 37 of the lower jaw 3 is pressed against the underside of the not yet deformed material web 1 to clamp the not yet deformed material web 1 between the two jaws 2 and 3.

It can be seen from FIG. 3 that the upper bending punch 8 has been moved downwards into the bending position, wherein it has pressed down the material web 1 in the advance plane and partially deformed it. The material web 1 is now at the upper end 36 of the lower punch 15.

Then, the lower punch 15 is moved upward until its upper end 36 is moved up to the stop 14 of the upper punch 8 and the web 1 is clamped between the lower punch 15 and the stop 14 and is again in its normal flow level. Since the lower punch 15 when driving against the stop 14, the web 1 entrains due to its arcuate movement, this is deformed, without that a substantial relative movement between the material web 1 and the end face 39 of the lower punch 15 takes place.

The curved in this step trapezoidal section now has the desired shape, so that the jaws 2 and 3 and the punch 8 and 15 can be moved back perpendicular to the feed plane of the web 1, as Figure 5 shows, so that the web 1 are advanced for a next bending process can.

While in the embodiment of Figure 1, the device has an upper and a lower punch 8 and 15 and two jaws 2 and 3, wherein the jaws and the punch are preferably perpendicular to the surface of the leading and trapezoidal to be bent material web can be adjusted, points the illustrated in Figure 6 and with reference to Figures 7 to 10 in its operation explained second embodiment of the device according to the invention an upper punch 41 and two pairs of jaws 42, 43 and 44, 45 on. The jaws 42 and 43 are each formed as vertically movable carriage, which are provided with a drive cylinder 46 and 47, respectively, to allow independent adjustment of the jaws perpendicular to the surface of the web 1 according to the double arrows 48 and 49.

The second upper jaw 44 is displaceable in this embodiment in the advancing direction of the material web 1 according to a double arrow 50 and thus not against the material web 1 and not arranged abstellbar also arranged on a carriage 53. The cooperating with this second clamping jaw 44 clamping jaw 45, however, is perpendicular to the web 1 on and off, as indicated by a further double arrow 51. By means of a drive cylinder 52, this is supported on the carriage 53, which is displaceable in the horizontal direction by means of a further drive cylinder 54, as a double arrow 55 indicates.

The upper bending punch 41 is articulated so connected via a described in connection with Figure 1 double joint 56, 57 in the manner of a parallel rocker with the trained as a carriage jaw 42 that movements of the upper punch according to the drawn double arrows 58 and 59 are achieved.

The upper bending punch 41 is in turn connected to its own drive cylinder 60.

The whole is arranged in a schematically indicated machine frame 61.

FIG. 7 shows how, when the clamping jaws 42, 43 and 44, 45 are in the clamping position, the two latter clamping jaws move in the direction of the arrow to the left, when the latter Bending punch 41 is employed against the web 1 and thereby pressed down on this, until the punch has formed in connection with the jaws a shown in Figure 8 trapezoidal 11 in the web 1.

Also in this embodiment, it can be seen that the steepness of the flanks 12 or legs of the trapezoid 11 depends on the respective shape of the outer end 62 of the clamping jaw 43.

Figure 9 shows how after completion of a bending operation, the jaws 42 and 43 are preferably retracted perpendicularly from the deformed web 1, as well as the single punch 41. The jaws 44 and 45 are moved back to their original position, the second lower jaw 45 also perpendicular is cleared of the web 1.

FIG. 10 shows how the material web 1, which has been bent gradually in a trapezoidal shape, is advanced in the next bending starting phase according to an arrow 63.

It is understood that in the case of FIG. 6 to 10 illustrated embodiment, for example, the drive cylinder 60 can also be made obliquely, so that the force applied by this cylinder 60 force is implemented as completely as possible bending force. The same applies to the drives of the bending punch 8, 15 of FIG. 1 to 5 illustrated embodiment.

With the device according to the invention Trapeze with very steep legs or flanks are mechanically bendable, as well as trapezoids with great depth. Therefore, it is possible to bend trapezoidal webs for trapezoidal or Trapezstegträger, which have both a high bending stiffness of the carrier profile produced therefrom and a high torsional stiffness, because both extending in the longitudinal direction of the carrier portions 13 and the more or less extending legs in flanks 12 provide the necessary connection stiffness. For some applications trapezes with sections 12 and 13 at right angles to each other would be ideal.

However, the device according to the invention is also suitable for bending material webs into other cross-sectional shapes, for example in asymmetrical trapezoids as well as rectangular, zig-zag, wavy and also meander-shaped cross sections.

Since in the apparatus according to the invention, the bending tool or the bending tools is mounted perpendicular to the material web to be deformed adjustable and may also be moved arcuately when moving into a final bending position, cross-sectional shapes such as trapezoidal shapes with steeper legs or flanks and deeper Trapeze or the like as with the known bending machine and without manual labor molding. After the deformation or bending operation, the bending tools can be withdrawn vertically from the deformed material web, so that the Bending tools do not hinder each other. However, it is also possible to comply with bending radii of the bent metal sheets, which rule out a favorable change in the microstructure of the material in the field of movement.

According to a further preferred feature of the invention, the tools of the device, that is, the jaws and the punch, be provided interchangeable, so that the device or machine can equip with bending tools of different sizes. The conversion to different tools is easily possible because of the vertical adjustability.

It is sufficient if only the parts of the clamping tools and / or the bending tools which come into contact with the material web to be bent are interchangeable.

Claims (10)

1. An apparatus for bending a web of material (1) with a clamping device and a bending device corresponding together, characterized in that the bending device comprises at least one bending punch (8, 15; 41) that is guided on differing paths in a working stroke and in a return stroke and that the at least one bending punch is carried both for curved displacement in the case of the working stroke and for linear displacement.
2. The bending apparatus as set forth in claim 1, characterized in that the at least one bending punch is carried both for circular displacement in the case of the working stroke and for linear displacement.
3. The bending apparatus as set forth in any one of the claims 1 or 2, characterized in that at least one pair of clamping jaws (42, 43) of the clamping device is moved relative to at least one other pair of clamping jaws (44, 45) of said clamping device.
4. The bending apparatus as set forth in any one of the claims 1 to 3, characterized in that the clamping device has two pairs of clamping jaws (42, 43; 44, 45) and that the bending device has a bending punch (41) that is operative between said pairs of clamping jaws (42, 43; 44, 45).
5. The bending apparatus as set forth in any one of the claims 1 to 4, characterized in that the clamping device has two clamping jaws (2, 3) and the bending device two bending punches (8, 15).
6. The bending apparatus as set forth in any one of the claims 1 to 5, characterized in that each bending punch (8, 15; 41) of the bending device is provided with a drive (60) of its own and that each bending punch (8, 15; 41) is hinge-linked to a clamping jaw (2, 3; 42) of the clamping device that is located on the same side of the web of material (1).
7. The bending apparatus as set forth in any one of the claims 1 to 6, characterized in that each bending punch (8, 15; 41) of the bending device is linked to a corresponding clamping jaw (2, 3; 42) of the clamping device by means of a double joint (18, 19; 56, 57).
8. The bending apparatus as set forth in any one of the claims 1 to 7, characterized in that at least one bending punch (8, 15; 41) is exchangeable.
9. The bending apparatus as set forth in any one of the claims 3 to 8, characterized in that the clamping jaws (2, 3; 42) and/or the bending punches (8, 15; 41) are provided with tools that are specifically devised for clamping or respectively bending and that are exchangeable.
10. The bending apparatus as set forth in any one of the claims 1 to 9, characterized in that the clamping device and the bending device have at least one bending edge each, said bending edges being guided toward each other in such a manner that during a portion of a bending movement there is provided at least one free portion of material.

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