JPH06505677A - sheet bending machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] sheet bending machine field of invention The invention comprises two bending punches arranged adjacent to each other and pivotally connected. and the bending punch has a sheet support with a sheet contact zone in the rest position. form a surface, with few bending punches (both of which are pivoted and connected to the pivot drive) It also has a counter punch placed opposite the bending punch. The counter punch can be moved linearly between the sheet processing position and the retraction position. The sheet is bent around the counter punch at the processing position. Regarding sheet bending machines.

The technology that has been developed and adopted is that the sheet placed on the lower mold is It has a process of moving a bending punch, and the bending punch is used to form a curved edge. Pressing the sheet into the mold in the area where the 973 and US Pat. No. 2,649,128), thereby bending the sheet.

Generally, the disadvantage of this technique is that it does not produce precisely defined edges or sharply curved edges. Each die can only form a specific bend (i.e., a specific bend angle). most of the applied energy is lost due to friction on the mold. It's about putting it away. In addition, these disadvantages can be avoided if the mold is mounted movably within the holder. These are divided into two mold parts (more specifically, pivoted to each other). This basically applies to the die model as well.In this regard, for example, German Patent No. 115961 or European Published Patent No. 3798863, Franc Sri Lanka Patent No. 221933, German Patent No. 1402118, German Patent No. 2418668, U.S. Patent No. 1045089, U.S. Patent No. 1258892 No., U.S. Patent No. 1,633,744, U.S. Patent No. 2,433,841, JP-A-62- No. 127125, JP-A-63-36923 and JP-A-63-199028. Please refer. In all these structures, the actual bending work is done on the upper bending pan. Therefore, the upper bending punch must be strong and A correspondingly large drive device must be provided.

Also known are bending machines for adding corrugations to sheets that have already been processed to a certain contour. (See WO 81102535). This machine can move up and down The upper punch is arranged on both sides of the stationary lower punch and on the main plane. It works together with a tilting auxiliary punch that can tilt up and down in the direction of. Upper punch is against The two inclined transverse punches work together with the stationary lower punch to form the corrugations in the sheet. preform the next waveform. This known bending machine can also handle sharp bending edges. The sheet is not designed or suitable for easy bending. do not have.

The sheet to be bent is clamped between the stationary lower web and the upper web and pivoted. In addition to pivot bending machines that perform bending operations with a single lower bending punch, Patent No. 3044526 or German Patent No. 1402838, U.S. Patent No. 328 No. 2976, British Patent No. 1119811, British Patent No. 2050887, The two lower bending punches pivot in opposite directions about a horizontal axis and the sheet to be bent sheet bending around an upper counter punch placed opposite these A processing machine has been proposed. Pivotal bearings of two lower bending punches perform bending Pivotal drives in the form of actuating cylinders mounted externally on both end faces of the machine Also provided on both end faces of these. Disadvantages of this machine are especially large machines When a width (e.g. 2 to 3 m) is required, the bending punch does not have an extremely heavy structure. Therefore, it is difficult to achieve accurate bending in the central area of the machine. A sheet that is bent in this central area (hereinafter referred to as a "bent sheet") ) is generally much more "open" than the bent sheet in the end regions. (i.e. the bent sheet has a convex curvature when viewed along the length of the bend) shape). Making the bending punch the large structure you need will reduce the required weight ( Due to the large size of the machine, machine width is limited. In other words, if the machine width exceeds 3m, the machine There is little chance of success as the total weight of the will be excessively large. For this reason, bending The weight of the machine tool must be between 15 and 201 cm.

Summary of the invention The object of the invention is a bending machine of the type mentioned at the outset, which requires relatively little energy. It is possible to bend the sheet at the same time and form a sharp curved edge at the same time. Various contours can be achieved by several bending operations, based on the simplest possible construction. , the large structure of the punch and frame that was conventionally required can be made considerably smaller. The object of the present invention is to provide a bending machine whose weight can be considerably reduced. Others of the present invention The aim is to provide a bending machine that provides the most careful treatment possible during bending. There is a particular thing.

According to the invention, a sheet bending machine of the type mentioned at the outset has two bending punches. are hinged in the machining area along their edges facing each other in the rest position. characterized by being directly interconnected.

Thus, the bending machine of the present invention improves the relationship between the two bending punches in the bending area. It has a joint connection, and power is transmitted through this hinge joint connection during sheet bending. Flux (power flux) is applied, which reduces the heat during the bending process. The horizontal component of the force applied to the bend is at least partially balanced; This is an important thing that is accomplished directly in the processing area. Thus, on the one hand, bending Eliminating heavy pivoting supports on the end face of the punch and, on the other hand, eliminating the heavy structure of the bending punch. can be done. According to experiments, compared to, for example, a 15-ton bending machine, this A lightweight bending machine constructed in accordance with the invention and having a total weight of about 2 tons can perform the same bending process. It has been demonstrated that the performance can be achieved, which means that the weight can be reduced by 115 to 10 times. This means that it can be reduced.

From the point of view of reducing weight, the two bending punches pivot independently of each other. The bending punch can be pivoted at positions distributed over the width of the bending machine. Activate the drive device so that the counter punch can only move in a straight line. is particularly effective.

When performing multiple bends to form the second or third bend, the The part of the sheet that has been removed may collide with the counter punch (collis ion) J). This makes the sinta bunch pivotable, e.g. This can be solved by For this purpose, the counterpunch must be mounted pivotably. In this case, both the pivot bearing and the punch itself should be All dimensions are such that counter force can be applied during construction. It is possible. Therefore, although it is not an absolutely necessary method, it is often explored using a preferred method. What is proposed and provided is that the counter punch can simply move in a straight line. It is. Gives the sheet to be bent the possibility of evasion and prevents the sheet from being bent by the counter punch. To be able to bend further after a collision problem like the one above. Therefore, it is particularly preferred according to the invention that the two bending punches are provided with independent pivot drives. It should be associated with moving equipment. An independent pivoting drive ensures that a collision occurs. You can easily stop the bending punch on one side when the bending punch has already been bent. Place the sheet resting on the side of the bending punch where the side of the sheet containing the cut part is located. the other bending punch continues to pivot to further bend the sheet.

This asymmetric actuation mote also allows at least a large portion of the horizontal component of the bending force to be , only a relatively small component force is introduced into the bending punch, and the bending punch is applied to the frame. In the introduced approach, compensation is achieved through a hinged joint connection.

In some cases concerning the construction of stationary parts of bending machines (e.g. during bending (because the seat part is fixed stationary), an actual example dynamically equivalent to the above example is constructed. An example would be preferable. In addition, in such an embodiment, one bending punch is Mounted stationary, the other bending punch and counter punch can pivot. The attached and pivotable bending punch has an angular velocity of twice the angular velocity of the counterpunch. Driven by speed.

Generally speaking, the bending machine of the present invention, due to its articulation, is particularly suitable for extreme bending operations. Suitable for counter punching and retracting from the sheet in the final bending process. It is particularly effective to allow the seat to be folded.

For careful handling of the sheet during bending and at the beginning of the bending process, In order to reach a suitable force conversion, between the sheet contact zones of each bending punch, the bending It has proven advantageous to provide the punch with a recess. This recess is for example , having a curved surface with a convex cross section (flat surface if desired) and a hinged articulation. The hinge joint or connection should be slightly offset from the seat contact plane. It is placed as a cut.

Allows for different working widths in the first location, enabling rapid conversion of bending machines In order, the bending punches are placed adjacent to each other across the width of the bending machine. It is further advantageous to provide removable tool segments. Bending pattern according to the present invention The bending machine of the present invention allows tool segmentation in an effective manner by connecting the hinges with a hinge. The tool segment can be held on the bending punch and the tool segment can be Tool holder on the side opposite the seat contact zone thanks to a simple plug-in connection functions as

In all of the above cases, a valid embodiment is such that the tool segments are connected in hinged pairs. The hinge connection of the bending punch is the hinge connection of all segment pairs. It is characterized by the fact that it is formed by knots. To facilitate assembly and replacement, The tool segment pairs have their own hinges that can be adapted to the length of the segment. It is particularly effective to provide a dipin. Keep tool segments adjacent to each other so that each hinge pin of a tool segment is It is effective to insert it into the hinge eye of the ment. Alignment when changing tools until the segments are no longer held together. , the length by which each pin protrudes relative to the adjacent segment, e.g. in a straight line commonly displaced.

On the other hand, for stability reasons, a common penetration running through all segment tools is recommended. Preferably, a through hinge pin is provided.

To facilitate replacement due to wear that occurs during operation, use a bending punch or tool segment. Preferably, the insert is provided with a separate insert forming the seat contact zone. . These inserts are screwed into the bending punch or tool segment, respectively. Wear.

It has been demonstrated that a particularly good and effective drive device can be obtained with arcuate toothed rails. the toothed rail is rigidly connected to an associated bending punch; It is driven by a pinion mounted on two shafts. What is even more effective is the toothed rail. The wheel is installed in the support groove of an arcuate bearing, e.g. a stationary bearing part. It is to be able to do so. This technique allows each bending punch to have a toothed rail.

It can be attached to the frame of the bending machine at the same time as it is attached through the .

There are also two separate electric motors for rotationally driving the two axes associated with the bending punch. It is also effective to provide a

Brief description of the drawing The invention will now be described in more detail with reference to particularly preferred embodiments shown in the accompanying drawings. However, the present invention is not limited to these examples.

FIG. 1 is a schematic overall view showing the sheet bending machine of the present invention in a rest position; .

Figure 2 shows the area of the bending tool in the operating position of the bending machine of the invention compared to Figure 1. FIG. 2 is a partially enlarged schematic diagram for comparison.

Figure 3 is a schematic end view showing the main components of the bending machine shown in Figures 1 and 2. be.

FIG. 4 shows a tool including a hinge joint for a bending punch of the bending machine shown in FIGS. 1 to 3. FIG. 3 is an exploded view showing segment pairs.

5, 6 and 7 show the bending tool and the various bending phases of the sheet to be bent. FIG.

Figure 8 shows the bending machines shown in Figures 1 to 7 (however, modified examples of Figures 1 to 7) FIG. 2 is an end view showing a bending punch of a bending machine according to the present invention.

FIG. 9 is an end view showing a modified embodiment of FIG. 8.

FIG. 10 is a schematic diagram showing the configuration of a bending tool of a bending machine according to yet another modified embodiment. This is a schematic diagram.

Figures 1I, 12 and 13 show the types of sheets produced by the bending machine shown in Figure 10. FIG. 7 is an end view similar to FIGS. 5, 6 and 7 showing different bending phases; Figure I shows the starting position, Figure 12 shows the intermediate position, and Figure 13 shows the end position. It is something.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS As shown in FIG. Here, the lower frame 2 is The main end support 3.4 on the lower frame 2 is provided with a vertical guide 5. I'm being kicked. Web-shaped or sword-shaped counter punch (upper tool or easily An upper tool holder 9 equipped with a knife (also called a sword) 10 can be vertically displaced up and down. It is guided within the vertical guide 5 as shown in FIG. This counter bunch 10 is attached to the tool holder 9. Although it is preferable to attach it detachably to the tool holder 9, it is designed to be integrated with the tool holder 9. You can also. Lower bent edge 13 designed somewhat like a cutting edge (see Figure 3) However, other cross-sectional shapes may be considered depending on the bend to be formed. It can also be done.

In order to move the upper counter punch IO up and down, the number I4 is shown schematically in Figure 1. A conventional spindle drive is provided as shown. These spindos The wheel drive device 14 is driven, for example, by a drive motor (if desired, gears and clutches). It has a spindle 16 which is driven (via a chain). The spindle 16 is During the rotation of the spindle 16, , the tool holder 9 is moved up and down within the guide 5 together with the counter punch 10. this The spindle drive 14 and the other drive means described below are manufactured in a conventional manner. It is attached to frame 2.

Additionally, there are two lower bends in the form of plates or webs for bending the sheet 18. A punch 19, 20 (see FIGS. 5 to 7) is provided. these two The lower bending punch 19.2o rotates around the common axis line 21 (see Figures 5 to 7). It is pivotally attached to the frame 2 in a manner described below so that it can pivot. The common axis line 21 is , the area of the bent edge 22 to be formed on the sheet 18 to be bent (slightly smaller than the bent edge 22) (more specifically, the counter punch lO formed by the guide 5.6) (in the vertical movement plane 23 (FIGS. 3 and 5)).

Drive for pivoting the lower bending punch 19.2o about the common axis 21 is formed by a pivot mechanism. This pivot mechanism, in an exemplary embodiment of the invention, Rack and pinion gears (first Several forms of Consists of a pivoting drive. For more details, please refer to Figures 8 and 9 in addition to Figures 1 to 3. As is clear from the figure, the lower region of each lower bending punch 19.2o Arc-shaped toothed racks or rails 61, 62 are fixed. these teeth The attached racks or segments 61,62 are, for example, parallel to each other and in a bending pattern. gears 6 of equal size mounted on shafts 27.28 also parallel to the wheels 19.20; It meshes with 3.64. As is clear from FIG. is driven, for example, by an electric drive motor 72, 73 (through gears not shown). (Optional). Both shafts 27 and 28 span the entire width of the bending machine l. and is rotatable on the frame 2 via a suitable bearing part 75. It is supported by Noh. The bearing component 75 is attached to the shaft 2, as will be described in more detail below. 7.28 on both ends and in the area of the individual rack and pinion gears 24 It is located at the midpoint of the axis 27,28. Each toothed rack gear 24 has teeth. racks 61.62 and shafts 27.28 for rotation with said shafts 27.28, respectively. Gear wheels 63, 64 attached to 28 are provided. As mentioned above, how many These rack and pinion gears 24 can act by dispersing the driving torque. They are distributed across the width direction of the bending machine 1 so that Therefore, axis 2 7. When 28 is rotationally driven, the toothed racks 61 and 62 move along an arcuate path (of the path). center is on the pivot line 21), which causes these toothed latches to Place the lower bending punch 19.20 connected to the punch 61.62 in the non-working position (Fig. 5). and a pivoted open working position (FIGS. 6 and 7).

Several bearings extending transversely to the stationary cross beam 74 of the frame 2 On the one hand, the shafts 27, 28 are arranged such that the parts 75 are distributed across the width of the machine On the other hand, in order to attach the bending punch I9.20 to the frame 2, a rack and It is fixed to the cross beam 74 at the pinion gear 24. these beari The bearing part 75 on the one hand has a removable bearing lid 76 for the shaft 27.28. (Fig. 2, Fig. 3) has a bearing 77 which can be replaced via the The bearing part 75 has arcuate sections on both sides of its upper region (see right side of Figure 2). A slide groove 78 is provided. Inside the slide groove 78, an arc-shaped toothed latch is formed. or toothed segments 61, 62 are provided with corresponding curved guides 61, 62. It is guided via an id key or guide ridge 79. Thus, two toothed The bearing parts 75 (one for the shaft 27) one for the shaft 28) and the other for the shaft 28). relatively solid structure toothed racks 61 and 62, these guide keys 79, and arcuate slide grooves. 78 and bearing part 75, the load is transferred to the machine. is absorbed by the dispersion method over the width of the Power forces are also directed to the frame 2 and its cross beam 74 in a dispersive manner.

Therefore, the bearing component 75 can have a structure that does not require much weight.

The pinion 63 is arranged on the front side of the bearing part 75 (Figs. 1 and 2). ), therefore in FIG. 3 only the shaft 27 and the associated pinion 63 are shown. The pinion 64 associated with the shaft 28 is located behind the bearing part 75. Therefore, we will mention what is indicated by the broken line in Figure 3. On the other hand, axis 2 8 bearing 77 (the bearing 77 is activated via the bearing lid 78) can be accessed) can be shown from FIG. 3 by the axis 28 shown on the right (see FIG. 2). (see also). Furthermore, it is clear from FIG. Robed cylinder: Designed to have a cross-sectional shape of J. Therefore, the example can be fixed and received without rotation. related Each bending punch 19.20 with a toothed segment 61.62 is For example, a washer projection 8o formed integrally with the respective toothed segment 61,62. , with a simple plug-in pedestal or press-in pedestal between the 810 and 810. (See also Figures 8 and 9 in addition to Figure 3), but these It can also be stopped.

It is clear from FIGS. 2 and 3 that the two bending punches 19.20 Along the upper inner edge and over the entire working width, it is articulated by a hinge joint connection 53. This is true. As shown in FIG. 4, interlocking hinge eyes 52 are provided. The hinge pins 54 are passed through these hinge eyes 52 to obtain the assembled state. It will be done. The hinge pin 54 of this hinge joint connection 53 forms the aforementioned pivot line 2I. , during operation the two bending punches 19.2o pivot about the pivot line 21.

To explain in more detail, the bending punch 19.2o is separately removable and replaceable. It is designed as a tool holder with a flexible tool segment 55. The components 55 are articulated in pairs via respective hinge bins 54 of matching length. ing. These tool segments 55 have longitudinal tongues 82 and associated A simple plug-in connection consisting of grooves 83 allows the bending part to function as a tool holder. 19.20, which makes the tool segment 55 particularly easy and can be replaced in a quick manner. Surprisingly, the individual tool segments 55 and There is no fixed connection between the respective tool holder or bending punch 19.20. It turns out that it's important. This also means that the horizontal component of the force generated during the bending operation is At least a large portion of the force is compensated by the hinge joint connection 53, so that the bending The vertical force(s) acting in the plane of the punch 19.20 are connected to the plug-in connection. (this is easily accomplished by this tongue/groove connection 82.83). This comes down to the fact that However, considering the wear and tear that occurs during work, , through the contact zone 84 (see also FIG. 8 in addition to FIGS. 3 and 4). It is suitable to provide a tool insert 85 which provides a suitable bending operation. This work Tool insert 85 may be, for example, a hard metal insert that is screwed onto tool segment 55. ] or attached to the bending punch 19.20 by the bolt 86 as shown in Figure 8. Each is formed with a hard metal insert that is screwed together. Figure 9 shows hard metal Another insert design is shown that further includes a tongue/groove connection 87 for the insert 85. There is. 8 and 9 show tools according to FIGS. 1 to 8 in the bending punch. It is shown in dashed lines that segment 55 can be omitted. For example, the left bend pattern The punch or bending punch 19 (and 20) itself forms a hinged joint connection 53. .

In this case, the insert 85 may be constructed continuously or as shown in FIGS. The segmentation may be performed according to the tool segments 55.

Below, schematic diagrams of Figures 5 to 7 and Figures 2 and 3 (Figures 2 and 3 are shown on the left In accordance with the present invention, the side bending punch 19 is shown pivoted. The functional modes of the sheet bending machine 1 will be explained.

The starting or resting position of the sheet bending machine l is shown in solid lines in FIG. There is. The upper counter bunch 10 occupies a rest position away from the metal sheet 18 In this rest position, the sheet 18 to be bent is bent manually or automatically. It is supplied to the cutting machine 1 and positioned at this position. Sheet bending cycle begins Then, first, the counter punch 1O is pressed until it comes into contact with the sheet 18 to be bent. , is moved downward by the spindle drive device 14 (FIG. 1), and the counter punch I The edge 13 of the O is placed on the lower bending punch 19.20. There are three sheets 18 This phase is effectively clamped between the punch or tool 1O119,20 is shown in FIG. 5, with the counter bunch lO indicated by a dashed line.

After this, the rack and pinion drive device 24 for the lower bending punch 19.20 is activated. The drive of the drive shaft 27,28 is switched on. This allows the toothed rack 61.62 is driven along the slide groove 78 (FIG. 3), and the bending punch 19.2 0 in opposite directions about a common pivot axis 21. That is, Figures 5 and 6 As shown, the left bending punch 19 is pivoted in the clockwise direction and the right bending punch 19 is pivoted clockwise. Punch 20 is pivoted in a counterclockwise direction. For pivoting of lower bending punch 19.20 , the sheet 18 is first bent, for example symmetrically, with an upper counter punch l. Abuts against the lower edge 13 of the O, thus forming a bent edge 22 (see Figure 6). (see). During this bending process, the counter punch 10 forms a stationary counter holder. For example, the counter punch lO is attached to the spindle drive device 14 (FIG. 1) itself. It is more appropriate to fix or block it at this position. Sheet 18 is an example For example, although it is bent along the curved edge 22 by about 90° (see FIG. 6), Further bending as shown in FIG. 7 achieves an acute bending angle in the sheet 18.

If the seam H8 has already been bent (the bent edge 34 in FIGS. 5 to 7) ), the bending edge 34 collides with the counter punch lO during the bending process, so-called ``Collision case J'' may occur.Bending When further driving the punches 19 and 20, undesirable deformation of the seam H8 may occur. In order to prevent It can be configured to be mounted so as to avoid collisions with the edges 34. child In this case, a pivoting bearing is required to prevent the counterpunch IO from colliding. become. Another solution to this collision problem is to provide coverage through hinged joints. It is effective to increase Therefore, the lower bending punches 19 and 20 are symmetrically In addition to the aforementioned operating mode of being driven (more specifically with constant angular velocity), A symmetrical mode of operation is assumed. Because, overall, a relatively small synthetic horizontal This is because only the components remain. In this regard, the illustrative embodiment provides separate By the drive motors 72.73 and the shafts 27.28 driven by these motors , independent pivoting drive and two bending punches of sheet bending machine 19.2 It is preferable to associate it with 0. Therefore, in the collision problem mentioned above, Sea H8's When the edge 34 collides with one side of the counter punch 10 (see FIG. 7), FIG. To continue the bending operation on the sheet 18 as shown in FIG. The bending punch 20 placed on the side of the collision side is stopped, and the other bending punch 19 Pivot the chisel further.

However, in addition to this, two bending punches 19.20 are 7 at different speeds and in continuous operation to reach, for example, the final position shown in FIG. It can also be considered.

Also, after reaching the situation shown in Figure 7, move the counter punch lO upward. away from the sheet contour 18 and then straddle both bending punches 19.20. dl-ing), and the curved edge 2 achieved thereby. A folded portion is formed in the area No.2. In other words, in Figure 7, the left sheet edge is bend directly against the sheet 18 of. During this bending process, these connections The frictional force exerted on the sheet 18 by the contact zone 84 is 18 without the need for a counter punch IO, double bending punch 19.2 Create enough force to hold it between zero.

Another important point in the bending machine 1 of the present invention is the start of the bending operation (see Fig. 5). 6), the sheet contact zone 84 is bent by a bending punch 19.20. Forms a support surface, that is, a seat surface 91 for the seat H8 in the rest position (FIG. 5), and It communicates with the hinge joint 53 via a recess 90. Bending process starts These recesses 90 then form the sheet 18 in the region of the curved edge 22 to be formed. This creates a room in which the sheet 18 is not compressed. Compression such as this occurs when the top surfaces of adjacent bending punches I9.20 are flat. ). Furthermore, it is clear from FIG. 5 that the hinge bin or pivot line 21 is Sheet contact surface 91 formed by contact zone 84 (i.e., in FIG. It is located slightly below the bottom surface of the sheet 18), so that when the bending operation starts, A favorable Leno Kuichi arm was created to transmit the bending moment to the seam 8. It is to be able to do so.

After the bending operation is completed, the several drives for the punch l0119.20 are reversed and Return the lower bending punch 19.20 to the vertical starting position shown in FIG. If not, move the upper counter punch IO upward. Then bend The processed sheet 18 is moved to the next bending position or removed from the bending machine. can be done.

A further bending device 1 is shown schematically in FIGS. 1O-13. this bend Essential operations related to the relative movement of the punch or tool 1O119, 20 of the processing device 1 The parts are completely identical to the previous example, but during the bending process, the upper counterpan blood! 0, but also one lower bending punch (in the embodiments shown in Figures 1O to 13, the right side The lower bending punch 20) is also held stationary, and the other lower bending punch 19 is It is pivoted similarly to the previously described embodiment (see FIGS. 11-13). Also, Atsuno (ka) In order to induce a relative pivoting movement between both punches, the counter punch IO It is preferable that the bending punch 19 pivot at an angular velocity of 1/2 (the three shown in FIG. 12). (see also the intermediate position of the punch as well as the final position shown in FIG. 13). Figure 10~1 In this embodiment shown in FIG. 3, from the upper counter punch lO in the rest position Observing the motion cycle, we see the same pivoting motion as previously described based on Figures 1-9. A cycle will occur. However, in Figures 1O to 13, the stationary frame Individual locomotion observed from the frame (not shown in detail in Figures 10-13) Phases are shown. The same type of bending machine l shown in Figures 10 to 13 The moving device produces a very slight movement on one side of the bent edge of the sheet 18 to be bent. This is desirable when it is necessary to

To explain the embodiment shown in Figures 10 to 13 in more detail, this embodiment also has two lower bending punches 19,20 are articulated by interengaging eye members 52. to form a hinge joint 53, and hinge bins 54 throughout the hinge assembly. is extending. Two bending punches 19.20 are placed next to the hinge joint 53 with rounded sides. It has the shape of a surface, on which both bending punches 19.20 hold the sheet to be bent. Contact with H8. From the point of view of ease of replacement, the double bending punches 19.20 are, for example, The individual screws are rigidly connected to the tool holder or punch lower part 56 by bolts 57. It can be assembled from tool segments 55. Pivoting for left lower punch 19 As a drive device, an arcuate shape with teeth on the underside (teeth not shown in detail) A guide rail 5B can be provided. These guide rails 58 It extends through a guide slit 59 provided at the bottom of the bending punch 20, and is Driving gear 60 (gear 60 is basically the same as gears 63, 64 of FIGS. 1-9) ). These gears 60 are driven by a drive motor (not shown in detail). ) and gears in the manner described above in connection with Figures 1 to 9. Wear.

FIG. 10 also shows that when the gear 60 rotates in a counterclockwise direction (see arrow), the left side how the punch 19 pivots outward or away from the right punch 20; is shown with a broken line. For simplicity, when one lower punch 19 pivots, the upper The punch IO also pivots (preferably, as described above, the angular velocity is 1/2 that of the lower punch 19). The mechanism for pivoting (up and down) is not shown.

The drive of the upper punch 10 is basically the same as the drive of the lower punch 19. A more favorable transmission ratio of 2:1 is ensured. Such a drive device itself is conventional , and there is no need to explain it in more detail here.

Also, although the installation of the upper punch lO to the frame is not shown in detail, The bending machine 1 in the 1θ diagram has basically the same structure as the installation described above in connection with Figure 1. can be realized. However, the main end support 3.4 is e.g. Lower frame 2 together with device 2 (indicated by number 14 in FIG. 1) or similar drive device. This can be done in a manner known to those skilled in the art.

Figures 1+ to 13 show the axis line along which the lower bending punch I9.20 makes relative pivot movement. 2I is shown, in which case the axis 21 is at the hinge joint 53 (Fig. 1θ). It coincides with the geometric axis of the hinge bin 54. During bending, upper punch 10 also pivots about this pivot line 21 (see FIGS. 12 and 13).

Of course, the center of the arcuate rail 58 is also on this axis line 21 (i.e., on the hinge joint axis 54 (on the geometric axis).

Although the invention has been described in connection with particularly preferred embodiments, there are Various other changes can be made. Therefore, for example, related to Figures 1 to 9 A through hinge having a length corresponding to the width of the machine is added to the hinge joint connection 53 described above. A pin 54 can also be provided. On the other hand, in the distributed hinge joint (Fig. 4) Therefore, one side of each hinge pin 54 should be slightly separated from the tool segment pair 55. The tool segments are The hinge eyes 52 can be reached in successive pairs of hinge eyes 52 .

In addition, as described above, the bending machine 1 is oriented vertically, and the seam to be bent [8] is oriented horizontally. In place of the arrangement, any other orientation (e.g., substantially tilted ) and tilt the sheet 18 at the bending start position.

Therefore, for this purpose only the frame part should be changed.

A drive motor, for example a drive motor 72.73 for pivoting a bending punch 19.20 and appropriate electrical control of the drive motors for the two spindle drives 14. A circuit should be installed to switch these drive motors on and off as needed. It can be configured as follows. In principle, these electric drive motors can be replaced by hydraulic motors, i.e. Of course, it can be replaced with a hydraulic cylinder.

In addition, the upper punch IO can be moved up and down by an eccentric drive device or an actuating cylinder, for example. In this case, the locking of the upper punch lO in the lower working position ( 2, 3, 6 and 7), the eccentric drive can be placed in this position if desired. This can be done by simply stopping it.

In the practical embodiment shown in Figure 1, the machine width is 1.500111L tool segment The length of the hinge pin 55 is 125 mm, the diameter of the hinge pin 54 is 8 mm, and the pin of the pivot drive 24 is 125 mm. The pitch is 400nwn, and each external drive unit is approximately 15mm to the end face of the machine l. It is offset by 0m+. The total weight of bending machine 1 is 500kl (hereinafter Yes, it is possible to bend a sheet with a thickness of 2 sheets without difficulty.

Special Table 16-505677 (7) international search report international search report Continuation of front page (81) Designated countries EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IT, LU, MC, NL, SE), 0A (BF , BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, TG. ), AT, AU, BB, BG, BR, CA, CH, C3, DE.

DK, ES, FI, GB, HU, JP, KP, KR, LK, LU , MG, MN, MW, NL, NO, PL, RO, RU, SD, S E

Claims (17)

[Claims] 1. two bending punches (19, 20) arranged adjacent to each other and pivotally connected; the bending punches (19, 20) in the rest position in the sheet contact zone. forming a sheet support surface (91) with a bending punch (84); At least one bending punch (9, 20) is pivotally mounted and connected to the pivot drive (24). and a counter paper arranged opposite to the bending punches (19, 20). further comprising a counter punch (10), the counter punch (10) is It is arranged so that it can be moved linearly between the machining position and the retracted position. Sheet bending process of bending the sheet (18) around the counter punch (10) In the machine (1), two bending punches (19, 20) are in the rest position, touching each other Directly interconnected in a hinge-like manner in the processing area along facing edges. A bending machine characterized by: 2. said two bending punches (19, 20) are able to pivot independently of each other; said pivoting The drive (24) is preferably distributed over the width of the bending machine (1). 4. Acting on said bending punches (19, 20) in a position The bending machine described in item 1 above. 3. The two bending punches (19, 20) are connected to independent pivoting drives (24). Bending machine according to claim 2, characterized in that: 4. Said counter punch (10) folds the sheet (18) so that the final bend the seat (18) is retractable during the machining phase; The bending machine according to claim 1 or 3. 5. One of the bending punches (20) is mounted in a stationary state. The other bending punch (19) and counter punch (10) are pivotally mounted. and the pivotable bending punch (19) adjusts the angular velocity of the counter punch (10). The bending process according to claim 1, characterized in that the bending process is driven at twice the angular velocity. machine. 6. Said bending punches (19, 20) have these sheet contact zones (84). A recess (90) is provided between, for example, a convex curved surface, a If desired, the bending punches (19, 20) may further include a hinge connection. A joint connection (53) is provided, and the axis (21) of the hinge joint connection (53) is It is characterized by being arranged slightly offset from the sheet contact surface (91). A bending machine according to any one of claims 1 to 5. 7. The bending punches (19, 20) are adjacent to each other across the width of the bending machine (1). removable worker segments (55, 85) arranged as A bending machine according to any one of claims 1 to 6, characterized in that: 8. The tool segment (55) is held on bending punches (19, 20). If the tool segment (55) The connection (82, 83) allows the work to be carried out on the side opposite the sheet contact zone (84). The bending machine according to claim 7, which functions as a tool holder. Machine. 9. The tool segments (55) are hingedly connected in pairs, and the tool segments (55) are The hinge joint connections (53) of the bending punches (19, 20) connect all segment pairs. Claim 7 or 8, characterized in that it is formed by a hinge connection. The bending machine described in . 10. The tool segment pair includes a segment that is adaptable to the length of the segment. Claim 9 characterized in that a pair of own hinge pins (54) is provided. The bending machine described in section. 11. Each hinge pin (54) of said tool segment is adjacent to each other on one side. characterized in that it protrudes into the hinge eye (52) of the tool segment that The bending machine according to claim 10. 12. a common through hinge extending through all said segment tools (55); Claim 7 or 8, characterized in that a pin (54) is provided. The bending machine described. 13. The bending punches (19, 20) or tool segments (55) include a sheet separate inserts (85) forming contact zones (84) are provided; The bending machine according to any one of claims 1 to 12, characterized by: . 14. The insert (85) is connected to the bending punch (19, 20) or tool segment. Claim 13, characterized in that the components (55) are each screwed. The bending machine described in section. 15. The pivot drive device (24) includes arc-shaped toothed rails (61, 62, 58). ), and the toothed rails (61, 62, 58) (19, 20) and attached to the shaft (27, 28). Claims characterized in that the invention is driven by pinions (63, 64, 60) The bending machine according to any one of items 1 to 14. 16. The toothed rails (61, 62) are provided with arcuate bearings, for example the flange. in the support groove (78) of the stationary bearing part (75) mounted on the arm (2). The bending machine according to claim 15, wherein the bending machine is . 17. for rotationally driving two shafts associated with the bending punches (19, 20); Claim characterized in that two separate electric motors (72, 73) are provided. The bending machine according to item 15 or 16.