Bending device with a rear stop unit

Abstract

The invention relates to a bending device (1) for producing a component by forming a sheet-metal workpiece (2), having a press table (3) and having a press beam (4) oriented parallel thereto, and having a stop (8, 9) for abutment and orientation of the metal sheet before a bending operation is carried out on the metal sheet, wherein a guide beam (13), oriented parallel to the longitudinal extent of the press table (3), of a rear stop unit is formed, and wherein at least a first stop (8) and a second stop (9) are arranged on the guide beam (13) and these are adjustable on the guide beam (13) by a motor, wherein, on the guide beam (13), a third stop (17) is arranged between the first stop (8) and the second stop (9) and a position of the third stop (17) is variable by adjusting the first stop (8) or by adjusting the second stop (9) along the longitudinal extent of the guide beam (13).

Description

[0001] The invention relates to a bending machine for manufacturing a component by forming a workpiece from sheet metal with a press table and with a press beam aligned opposite the press table and parallel to a longitudinal extension of the press table according to the preamble of claim 1.

[0002] In bending machines or press brakes of the prior art, it is known to equip the press brake with a backgauge device for aligning the sheet metal part inserted by an operator. This device serves to guide the longitudinal edge of the workpiece for positioning the sheet metal to be processed on the side of the press table facing away from the operator and thus in a more difficult-to-access location. The backgauge device comprises stops that can be moved into the position required for the bending operation by means of an adjusting or traversing device. The stops are preferably adjusted by a motor according to the bending edge to be produced on the workpiece. Their position depends on the length of the longitudinal edge of the workpiece to be guided against the stops and on the desired leg length after the bending edge has been formed.

[0003] The stops of the backgauge also act as supports for the workpiece along its longitudinal edge. With large sheet metal parts, especially those made of thin material, undesirable bending or sagging can occur due to the weight when the sheet is inserted into the bending machine.

[0004] Bending machines with a backgauge device are described, for example, in the documents WO 2020 / 041807 A1, JP 2001 150071 A, JP 2005 000980 A, JP S57 94428 A, and JPH06 9715 U.

[0005] Document JP H10 211523A describes a press brake with a backgauge device for aligning the edge of a sheet metal workpiece when it is inserted into the press brake before bending. This device has a guide beam running parallel to the press table with two motor-adjustable stops on it. A third stop, also movable along the guide beam, is positioned between the two motor-adjustable stops but is itself not driven. To position this third stop on the guide beam, it can be pushed to the center of the edge of the sheet metal workpiece by one of the two driven stops.

[0006] The object of the present invention is to create a device and a method with which reliable and high-quality production of workpieces can be achieved.

[0007] This problem is solved by a device according to claim 1.

[0008] The object of the invention is achieved by a bending device for producing a component by forming a workpiece from sheet metal by free bending or embossing, comprising a press table and a press beam aligned opposite the press table and parallel to a longitudinal extension of the press table, and a stop for positioning and aligning the sheet metal before carrying out a bending operation on the sheet metal, wherein a guide beam aligned parallel to the longitudinal extension of the press table is formed as a backgauge unit, and wherein at least a first stop and a second stop are arranged on the guide beam and these are adjustable on the guide beam by a motor.A third stop is arranged on the guide beam between the first stop and the second stop, wherein the position of the third stop can be changed by adjusting the first stop or by adjusting the second stop along the longitudinal extent of the guide beam, and wherein the third stop comprises a guide carriage, a bearing block and a stop finger which is pivotally connected to the bearing block, wherein the stop finger is pivotably mounted about an axle bolt, and wherein the axle bolt is aligned in the direction of the longitudinal extent of the guide beam and is arranged in a region of the guide beam facing away from the press table.

[0009] Further training is also advantageous in which the guide beam includes a guide profile and the bearing block engages with the guide profile in a form-fitting manner and is slidable along the guide profile.

[0010] A further development is particularly advantageous in which the guide carriage of the third stop is designed with a buffer projecting in the direction of the longitudinal extension of the guide beam on end faces corresponding to opposite directions of movement.

[0011] In a preferred embodiment of the bending device, the buffer comprises a bolt projecting perpendicularly from a first end face and / or from a second end face.

[0012] It is also advantageous if the bolt is arranged in a central plane of the guide profile.

[0013] According to an alternative further development of the bending device, it is provided that the end faces of the guide carriage of the third stop each comprise two bolts as buffers, the bolts being arranged symmetrically with respect to a central plane of the guide profile.

[0014] It is also advantageous if the bolts are arranged perpendicularly from the first end face and / or from the second end face.

[0015] To better understand the invention, it is explained in more detail with reference to the following figures.

[0016] They each show, in a highly simplified, schematic representation: Fig. 1 a bending machine for manufacturing a component by forming a workpiece from sheet metal; Fig. 2 a detail of the bending machine with the backgauge device according to Fig. 1 Fig. 3 shows a detail of the backgauge device with the guide beam and the stops; Fig. 4 shows a cross-section of the third stop accordingly. Fig. 2 Fig. 5 shows a top view of the third stop according to Fig. 2; Fig. 6 a top view of the backgauge device with an arrangement of the stops; Fig. 7 a detail of the third stop of the backgauge device shown in perspective; Fig. 8 a second embodiment of the backgauge device with an alternative third stop shown in perspective.

[0017] It should be noted at the outset that in the differently described embodiments, identical parts are provided with the same reference numerals or component designations, and the disclosures contained in the entire description can be applied analogously to identical parts with the same reference numerals or component designations. Furthermore, the positional designations chosen in the description, such as top, bottom, side, etc., refer to the figure directly described and illustrated, and these positional designations must be applied analogously to the new position if the position changes.

[0018] The Fig. 1Figure 1 shows a bending device or bending machine 1 for manufacturing a component by forming a workpiece 2 made of sheet metal. The bending machine 1 comprises a press table 3 and a press beam 4 positioned opposite the press table 3 and parallel to its longitudinal axis. The press beam 4 is vertically adjustable (in the Y-direction) relative to the stationary press table 3 by means of a suitable motor drive, for example, hydraulic cylinders (not shown). To perform a bending operation on the workpiece 2, a lower bending tool 5 (a die) and an upper bending tool 6 (a punch) are attached in pairs to the press table 3 and the press beam 4, respectively.The bending tools 5, 6 are suitable, for example, for free bending or embossing a workpiece 2. To carry out the bending operation, the press beam 4 is moved against the press table 3, thereby pressing the upper bending tool 6 against the lower bending tool 5. Before the actual bending operation is performed on the workpiece 2, an operator places it between the bending tools 5, 6 by bringing a rear longitudinal edge 7 against stops 8, 9, thus aligning the workpiece 2.

[0019] The first stop 8 and the second stop 9 are part of a backgauge 10 and these stops 8, 9 can be adjusted relative to each other in the direction of the longitudinal extension of the press table 3 (in the Z-direction) depending on the size of the workpiece 2. The bending machine is also equipped with a control device 11 and an associated operating terminal 12. The positioning of the stops 8, 9 can thus be carried out semi-automatically by the operator by entering the appropriate values ​​at the operating terminal 12.

[0020] The Fig. 2 The backgauge device 10 of the bending machine 1 is shown according to Fig. 1For the sake of clarity, only the press table 3 of the bending machine 1, together with the backgauge 10, is shown. The backgauge 10 is designed with a guide beam 13 aligned parallel to the longitudinal axis of the press table 3 (in the Z-direction), on which the first stop 8 and the second stop 9 can be adjusted by motor drive in the direction of the longitudinal axis of the press beam 4. Furthermore, the backgauge 10 is also designed to allow adjustment of this guide beam 13 in the X-direction as well as in the vertical direction (Y-direction). Changing the position in the X-direction adjusts the position of the stops 8 and 9 to the corresponding position to achieve the leg length to be formed on the workpiece 2.By adjusting the first stop 8 and the second stop 9 in the longitudinal direction of the guide beam 13, an adjustment according to the length of the longitudinal edge 7 of the workpiece 2 is possible.

[0021] The Fig. 3 Figure 1 shows a detail of the backgauge device 10 with the guide beam 13 and the stops 8, 9 arranged on it. As shown in the detailed illustration according to the Fig. 3 As can be seen, the guide beam 13 comprises a first toothed belt drive 14 and a second toothed belt drive 15, each of which is operatively connected to one of the stops 8, 9 for their adjustment. The guide beam 13 of the backgauge device 10 also has a guide profile 16 to which the two stops 8, 9 are positively attached in such a way that they can only be adjusted in the Z-direction.

[0022] As shown by the Fig. 2As shown, in the bending machine 1 according to the invention, a third stop 17 is arranged on the guide beam 13 of the backgauge device 10 between the first stop 8 and the second stop 9. The position of the third stop 17 on the guide beam 13 is achieved by adjusting the first stop 8 or the second stop 9 along the longitudinal extent of the guide beam 13. The use of the third stop 17 proves particularly advantageous when processing workpieces 2 with a particularly long length (Z-direction) or when performing bending operations with particularly long leg lengths (X-direction), as well as when using thin sheet metal. The third stop 17 prevents undesirable or detrimental deflection of the workpiece 2 at its longitudinal edge 7.

[0023] Unlike the first stop 8 and the second stop 9, the third stop 17 does not have its own motor drive, i.e., no separate toothed belt drive. Its position is changed by moving it using one of the two stops 8 or 9. That is, if the third stop 17 is to be moved along the guide bar 13 to a position with a larger Z-value, an input at the operating terminal 12 moves the first stop 8 towards the third stop 17 by moving it towards a larger Z-value, thus moving the third stop 17 in the positive Z-direction. Conversely, the second stop 9 is used to move the third stop 17 to a position with a smaller Z-value.Following the corresponding displacement of the third stop 17 by one of the stops 8, 9, the first stop 8 and the second stop 9 are brought into their designated position on the guide beam 13.

[0024] Fig. 4 shows a cross-section through the third stop 17 accordingly Fig. 2The third stop 17 comprises a guide carriage 18, a bearing block 19, and a stop finger 20. When placed on the guide beam 13, the guide carriage 18 engages positively with the guide profile 16 of the guide beam 13. The bearing block 19 is attached to the guide carriage 18 of the third stop 17. The stop finger 20 is pivotally mounted on the bearing block 19. For this purpose, the stop finger 20 and the bearing block 19 are pivotally connected to each other by an axle bolt 21, which is aligned in the direction of the longitudinal extension of the guide beam 13 (Z-direction). At its end region facing away from the guide beam 13, the stop finger 20 has a support surface 22 and a contact surface 23 for the longitudinal edge 7 of the workpiece 2 to be aligned against it. Fig. 1In addition to the articulated mounting of the stop finger 20 on the bearing block 19 by means of the axle bolt 21, an adjusting screw 24 is provided between the stop finger 20 and the bearing block 19, limiting the pivot range of the stop finger 20. The adjusting screw 24 allows adjustment of the horizontal alignment of the stop 17 and thus the vertical position of the support surface 22 on the stop finger 20.

[0025] The Fig. 5 shows a top view of the third stop 17 according to Fig. 2For the sake of clarity, only the guide profile 16 of the backstop device 10 or the guide beam 13, to which the third stop 17 is attached, is shown. According to the invention, buffers 27 are formed on a first end face 25 and on a second end face 26 of the guide carriage 18. In this embodiment, the buffers 27 on the first end face 25 of the guide carriage 18 are formed by two bolts 29, 30 projecting perpendicularly from the first end face 25 symmetrically with respect to a central plane 28 of the guide profile 16. Similarly, the two buffers 27 are also attached to the second end face 26 of the guide carriage 18, projecting perpendicularly from the second end face 26.

[0026] The Fig. 6Figure 1 shows a top view of the backgauge device 10. The stops 8, 9, and 17 are shown in their mounted state on the guide profile 16 of the guide beam 13. The relative arrangement of the second stop 9 and the third stop 17 in the illustration shows... Fig. 6This illustrates a situation in which the third stop 17 is to be moved along the guide beam 13 in the negative Z-axis direction with the aid of the second stop 9. As indicated by arrow 31, at the moment shown, the second stop 9 is moving towards the third stop 17. An end face 32 of the guide carriage 33 of the second stop 9, facing the third stop 17, eventually comes into contact with the protruding ends of the bolts 29, 30 of the third stop 17, so that as the movement of the second stop 9 continues, the third stop 17 is moved by the second stop 9 in the negative Z-direction. The bolts 29, 30 of the buffers 27 thus act as spacers, ensuring that a minimum lateral distance (in the Z-direction) between the stops 8, 9, 17 is maintained when they are moved along the guide beam 13.

[0027] Furthermore, by arranging two bolts 29, 30 of the buffers 27 symmetrically with respect to the central plane 28 of the guide profile 16, it can be achieved that a lateral tilting of the guide carriage 18 of the third stop 17 is avoided.

[0028] The Fig. 7 Figure 1 shows a perspective view of a detail of the third stop 17 of the backgauge device 10 of the bending machine 1. The illustration corresponds to a view of the first end face 25 of the guide carriage 18 of the third stop 17. The two bolts 29, 30 of the buffers 27 are attached to the first end face 25 of the guide carriage 18 and are arranged symmetrically relative to the guide profile 16.

[0029] The Fig. 8Figure 1 shows a second embodiment of the third stop 17 of the backgauge device 10 of the bending machine 1 in perspective. According to this embodiment, a single bolt 29 is provided as a buffer 27 on the first end face 25 of the guide carriage 18. The bolt 29 projects perpendicularly from the first end face 25 and is substantially fixed in the central plane 28 of the guide profile 16 on the first end face 25.

[0030] The examples shown illustrate possible design variations.

[0031] The scope of protection is determined by the claims.

[0032] All references to value ranges in this description are to be understood as encompassing any and all sub-ranges thereof, e.g., the reference 1 to 10 is to be understood as including all sub-ranges, starting from the lower limit 1 and the upper limit 10, i.e., all sub-ranges begin with a lower limit of 1 or greater and end with an upper limit of 10 or less, e.g., 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

[0033] Finally, for the sake of clarity, it should be noted that, for a better understanding of the structure, some elements have been shown not to scale and / or enlarged and / or reduced in size. Reference numeral list

[0034] 1 Bending machine 30 bolt 31 Arrow 2 workpiece 32 Front 3 Press table 33 Guide carriage 4 Press beam 5 lower bending tool 6 upper bending tool 7 Long edge 8 first attack 9 second attack 10 Back gauge 11 Control device 12 operator terminal 13 Guide bars 14 first toothed belt drive 15 second toothed belt drive 16 Leadership profile 17 third attack 18 Guide carriage 19 bearing block 20 tapping finger 21 Axle bolts 22 Page 23 Investment page 24 Adjustment screw 25 first front 26 second forehead 27 buffer 28 Middle level 29 bolt

Claims

1. A bending device (1) for producing a component by forming a workpiece (2) from sheet metal by air bending or bottom bending, having a press table (3) and having a press beam (4) which is located opposite the press table (3) and is aligned parallel to a longitudinal extent of the press table (3), and having a stop (8, 9) for contacting and aligning the sheet metal before carrying out a bending operation on the sheet metal, wherein a guide beam (13), which is aligned parallel to the longitudinal extent of the press table (3), of a rear stop unit is formed, and wherein at least a first stop (8) and a second stop (9) are arranged on the guide beam (13) and these are motor-adjustable on the guide beam (13), wherein a third stop (17) is arranged on the guide beam (13) between the first stop (8) and the second stop (9), and wherein a position of the third stop (17) can be changed by adjusting the first stop (8) or by adjusting the second stop (9) along the longitudinal extension of the guide beam (13), and wherein the third stop (17) comprises a guide carriage (18), a bearing block (19) and a stop finger (20), wherein the stop finger (20) is connected to the bearing block (19) in an articulated manner, wherein the stop finger (20) is mounted so as to be pivotable about an axle pin (21), and wherein the axle pin (21) is aligned in the direction of the longitudinal extension of the guide beam (13), characterized in that the axle pin (21) is arranged in a region of the guide beam (13) facing away from the press table (3).

2. The bending device (1) according to claim 1, characterized in that the guide beam (13) comprises a guide profile (16) and the bearing block (19) is positively engaged with the guide profile (16) and is displaceable along the guide profile (16).

3. The bending device (1) according to claim 1 or 2, characterized in that the guide carriage (18) of the third stop (17), on end faces (25, 26) corresponding to opposite directions of movement, is in each case formed with a buffer (27) projecting in the direction of the longitudinal extension of the guide beam (13).

4. The bending device (1) according to claim 3, characterized in that the buffer (27) comprises a pin (29, 30) projecting perpendicularly from a first end face (25) and / or from a second end face (26).

5. The bending device (1) according to claim 4, characterized in that the pin (29, 30) is arranged in a central plane (28) of the guide profile (16).

6. The bending device (1) according to claim 3 or 4, characterized in that the end faces (25, 26) of the guide carriage (18) of the third stop (17) each comprise two pins (29, 30) as buffers (27), wherein the pins (29, 30) are arranged symmetrically with respect to a central plane (28) of the guide profile (16).

7. The bending device (1) according to claim 6, characterized in that the pins (29, 30) are arranged projecting perpendicularly from the first end face (25) and / or from the second end face (26).

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