Bending aid for a press brake

Abstract

The invention relates to a support device (15) for a press brake, comprising a base frame (24) and a support plate (17) with a bearing surface (18) which can be positioned between a base position (26) and a maximum position (27). The support plate (17) is arranged on a lever linkage system (25) which is connected to a drive unit (32) and which is designed as a parallel kinematics system. The drive unit (32) comprises a crank (35), which is connected to a positioning drive (33) designed as a rotary drive (34), and a rocker (54), which is connected to the crank in an articulated manner. The rocker (54) is connected to the crank (35) by means of an eight rotary joint (55) and to the lever linkage system (25) by means of a ninth rotary joint (56).

Claims

1. A support device for a press brake, comprising: (a) a base frame; (b) at least one connecting plate arranged on the base frame for securing the support device on the press brake and defining a perpendicular connecting plane; (c) a drive unit comprising a crank; (d) a lever linkage system connected to the drive unit and comprising a parallel kinematic system, the lever linkage system comprising a first main lever arm with a first rotary joint and a second rotary joint separated from the first rotary joint by a first standard interval and a second main lever arm with a third rotary joint and a fourth rotary joint arranged parallel to the first main lever arm, the third rotary joint being separated from the fourth rotary joint by a second standard interval, wherein the first main lever arm and the second main lever arm are mounted on the base frame by the first rotary joint and the third rotary joint, wherein the first rotary joint and the third rotary joint lie in a main bearing plane; (e) a support plate arranged on the lever linkage system and comprising a bearing surface positionable between a first end position and a second end position; (f) a first support arm parallel to the main bearing plane and mounted on the first main lever arm and the second main lever arm by the second rotary joint and the fourth rotary joint, the first support arm comprising a part projecting over the fourth rotary joint; (g) a second support arm; (h) a positioning drive comprising a rotary drive connected to the crank; (i) a rocker joined to the rotary drive; (j) a fifth rotary joint arranged on the part of the first support arm projecting over the fourth rotary joint; and (k) a sixth rotary joint, a seventh rotary joint, an eighth rotary joint, and a ninth rotary joint; wherein the first standard interval between the first rotary joint and the second rotary joint is equal to the second standard interval between the third rotary joint and the fourth rotary joint and the second rotary joint and the fourth rotary joint are spaced further from the perpendicular connecting plane than the first rotary joint and the third rotary joint; wherein the support plate is mounted on the first support arm by the fifth rotary joint; wherein the support plate is connected by the sixth rotary joint to the second support arm; wherein the second support arm is connected parallel to the first support arm by the seventh rotary joint to the first main lever arm or the second main lever arm and the seventh rotary joint is arranged along a straight line extending through the first rotary joint and the second rotary joint or extending through the third rotary joint and the fourth rotary joint; and wherein the rocker is connected by the eighth rotary joint to the crank and by the ninth rotary joint to the lever linkage system.

2. The support device as claimed in claim 1, wherein the rocker is connected by the ninth rotary joint to the support arm of the lever linkage system.

3. The support device as claimed in claim 2, wherein the rocker is connected on a section of the support arm projecting above the second rotary joint to the second rotary joint.

4. The support device as claimed in claim 1, wherein the crank in the first end position of the support plate is arranged at an acute angle between 1 and 20 relative to the rocker, and wherein the crank and the rocker are arranged relative to one another in the second end position of the support plate at an acute first angle between 160 and 179.

5. The support device as claimed in claim 1, wherein the crank of the positioning drive in the first end position of the support plate is rotated so that the crank is arranged at a second angle between 180 and 270 relative to the perpendicular connecting plane.

6. The support device as claimed in claim 1, wherein the crank of the positioning drive is rotated in the second end position of the support plate so that the crank is arranged at a second angle between 0 and 45 relative to the perpendicular connecting plane.

7. The support device as claimed in claim 1, wherein the positioning drive comprises a servomotor.

8. The support device as claimed in claim 1, wherein the support arm is spaced apart further from the main bearing plane than the support arm.

9. The support device as claimed in claim 1, wherein between the connecting plate and base frame an adjusting device is arranged, wherein the base frame adjustable via the adjusting device relative to a position of the base frame to the connecting plate parallel to the perpendicular connecting plane in a vertical direction.

10. The support device as claimed in claim 9, wherein the adjusting device comprises a drive motor.

11. The support device as claimed in claim 1, wherein the connecting plate on an interface of the connecting plate to the press brake has a linear guide, so that the support device is adjustable relative to the press brake parallel to the perpendicular connecting plane in a horizontal direction.

12. The support device as claimed in claim 1, wherein the support device comprises a protective cover, wherein the protective cover comprises a fixed section and a section which can be moved with the support plate, and the first main lever arm and/or the first support arm comprises at least in sections an external contour adjusted to the internal contour of the protective cover.

13. The support device as claimed in claim 1, wherein the distance of the fifth rotary joint to the sixth rotary joint is between 25% and 60% of the distance of the first rotary joint to the second rotary joint and wherein the fourth rotary joint has the same distance from the fifth rotary joint as the first rotary joint from the second rotary joint.

14. The support device as claimed in claim 1, wherein the distance of the ninth rotary joint from the seventh rotary joint is between 5% and 30% of the distance of the first rotary joint from the second rotary joint and wherein the distance of the eighth rotary joint from the ninth rotary joint is between 110% and 145% of the distance of the first rotary joint to the second rotary joint, and wherein the distance of the center of rotation of the positioning drive from the eighth rotary joint is between 45% and 75% of the distance of the first rotary joint from the second rotary joint.

15. The support device as claimed in claim 1, wherein the distance of the first rotary joint from the third rotary joint is between 25% and 60% of the distance of the first rotary joint from the second rotary joint, and wherein the horizontal distance of the first rotary joint from the third rotary joint is between 15% and 40% of the distance of the first rotary joint from the second rotary joint and wherein the horizontal distance of the center of rotation of the positioning drive from the third rotary joint is between 35% and 65% of the distance of the first rotary joint from the second rotary joint.

16. A processing system comprising a press brake with a first adjustable pressing bar, which comprises a first tool holder and a second fixed pressing bar, which comprises a second tool holder, and a support device for supporting a sheet metal to be processed, which via at least one connecting plate can be secured onto the press brake, wherein the support device is designed according to claim 1.

Description

(1) For a better understanding of the invention the latter is explained in more detail with reference to the following Figures.

(2) In a much simplified, schematic representation:

(3) FIG. 1 shows a side view of a processing system with a press brake and a support device;

(4) FIG. 2 shows a side view of a schematic view of a support device;

(5) FIG. 3 shows a perspective view of an advantageous embodiment variant of a support device;

(6) FIG. 4 shows a further perspective view of an advantageous embodiment variant of a support device with a removed protective cover;

(7) FIG. 5 shows a side view of an advantageous embodiment variant of a support device in a maximum position;

(8) FIG. 6 shows a side view of an advantageous embodiment variant of a support device in a basic position.

(9) First of all, it should be noted that in the variously described exemplary embodiments the same parts have been given the same reference numerals and the same component names, whereby the disclosures contained throughout the entire description can be applied to the same parts with the same reference numerals and same component names. Also details relating to position used in the description, such as e.g. top, bottom, side etc. relate to the currently described and represented figure and in case of a change in position should be adjusted to the new position.

(10) FIG. 1 shows in a schematic view the side view of a processing system 1. The processing system 1 comprises a press brake 2, which is provided for bending a sheet metal 3.

(11) The press brake 2 comprises a first adjustable pressing bar 4, in which a first tool holder 5 is formed for mounting a first bending tool 6. The first bending tool 6 is preferably designed here as a bending punch 6. Furthermore, the press brake 2 comprises a second fixed pressing bar 7 on which a second tool holder 8 is formed for mounting a second bending tool 9. The second bending tool 9 is preferably designed as a bending die and corresponds with the first bending tool 6.

(12) The sheet metal 3 to be bent is placed on a sheet metal supporting surface 10 of the second bending tool 9. The first bending tool 6 or the first adjustable pressing bar 4 is moved upwards or downwards by a press drive unit 11 in vertical direction. To control the press drive unit 11 a computer unit 12 is provided which can be coupled to an input and/or display unit 13.

(13) Furthermore, it is possible for the processing system 1 to comprise a manipulation device 14, by means of which the sheet metals 3 to be processed can be manipulated automatically. Alternatively to this, it is also possible that the sheet metals 3 to be processed can be placed manually into the press brake 2.

(14) In order to process large sheet metal workpieces 3, a support device 15 can be attached to the press brake 2, which can support a sheet metal leg 16 of the sheet metal 3 to be processed which projects out relative to the bending tool 6, 9 during the bending process. In this way it is possible to prevent the projecting sheet metal leg 16 from bending downwards due to its inherent mass and due to gravity and thus from deforming unintentionally.

(15) The support device 15 comprises a support plate 17, on which a bearing surface 18 is formed. The sheet metal 3 to be processed can lie on the bearing surface 18 and is guided and supported during the bending process by the support device 15. The support device 15 also comprises a connecting plate 19 by means of which the support device 15 can be secured onto the press brake 2.

(16) In this way there are several ways of connecting the connecting plate 19 to the press brake 2. For example, the connecting plate 19 can be connected to the press brake 2 by means of a guide rail system, which is designed as a linear guide 20. By means of such a linear guide 20 it is possible that the support device 15 is adjustable in a horizontal direction 21. The adjustment of the support device 15 in horizontal direction 21 can be performed as required manually or by means of a drive unit.

(17) For example a quick coupling unit or a screw connection can be provided as an alternative fastening between the connecting plate 19 and press brake 2. In principle here all of the fastening elements known to a person skilled in the art can be used.

(18) The transitional interface between the press brake 2 and support device 15 is represented by a connecting plane 22. Said connecting plane 22 is preferably aligned vertically in the operational state of the support device 15 and is thus parallel to an end face 23 of the front side of the press brake 2, on which the support device 15 is attached. The connecting plane 22 thus defines the alignment of the support device 15 in the operating state in which the support device 15 is secured to the press brake 2.

(19) All of the positions, such as top, bottom etc. relate to the operation ready state of the support device 15, in which the latter is attached to the press brake 2.

(20) FIG. 2 shows in a side view according to FIG. 1 a schematic view of the support device 15 according to the invention by means of which its functioning and structure is explained and described.

(21) The support device 15 is illustrated by simplified dashes which illustrates the central lines of the individual levers.

(22) The support device 15 comprises a base frame 24, on which a lever linkage system 25 is arranged and on which lever linkage system 25 the support plate 17 is secured. By means of such a lever linkage system 25 it is possible that the support plate 17, in particular its bearing surface 18, can be pivoted between a basic position 26 and a maximum position 27. By means of the correct dimensioning of the lever linkage system 25, a pivoting center 28 of the pivot movement is congruent with the outer bearing edge of the second bending tool 9 and thus during the whole bending process or during the whole pivoting process it is ensured that the sheet metal 3 to be bent, in particular the sheet metal leg 16, bears fully on the bearing surface 18 of the support plate 17.

(23) In order that the bearing surface 18 of the support plate 17 in its basic position 26 is on the same level as the sheet metal supporting surface 10 of the second bending tool 9, it is possible that an adjusting device 29 is attached between the connecting plate 19 and base frame 24 by means of which the base frame 24 can be adjusted in a vertical direction 30. This is necessary if various different bending tools 9 are used which have different dimensions. The adjusting device 29 can be driven manually here by a crank. In a further embodiment variant it is also possible to provide a drive motor 31 which is coupled to the computer unit 12 and thus enables an automatic height adjustment of the support plate 17.

(24) The base frame 24 can be constructed from profiles secured relative to one another. Furthermore, it is also possible that the base frame 24 is formed by a one-piece cast, steel component or aluminum block.

(25) On the base frame 24 a drive unit 32 is secured which is provided for adjusting and positioning the lever linkage system 25. The drive unit 32 is preferably designed as a positioning drive 33 and comprises a rotary drive 34. Said rotary drive 34 can be provided by using a servomotor. Such a servomotor can also be coupled to a gear, in order to increase the torque or the positioning precision. The use of a servomotor has proved to be ideal as a servomotor can achieve a high degree of precision and also has a high torque. Furthermore, a servomotor can be coupled very effectively by a corresponding intermediate electrics to the computer unit 12 of the press brake 2.

(26) The drive unit 32 also comprises a crank 35, which is rotated by the rotary drive 34 about its center of rotation 36.

(27) The lever linkage system 25 comprises a first main lever arm 37, in which a first and a second rotary joint 38, 39 are mounted.

(28) All of the components of the lever linkage system are described in more detail in an advantageous embodiment of the support device 15 with reference to the following Figures and description passages. For reasons of simplicity according to the functional model shown in FIG. 2 a lever arm is represented simply as a central line between two rotary joints, and such a central line is denoted as a lever arm within the meaning of this application.

(29) The first main lever arm 37 is formed according to this description for example by a straight line, which extends from the central point of the first rotary joint 38 to the central point of the second rotary joint 39. The length of the first main lever arm 37 is seen as the standard interval between the first and second rotary joint, in particular between its central points.

(30) Where it is mentioned that two main lever arms are in parallel with one another, this means that there is a straight line of a lever arm connecting the central points between two rotary joints, which is parallel to a second straight line of a further lever arm connecting the central points between two rotary joints.

(31) By means of this simplified functional model used for explanation purposes however there is no restriction of the options for the configuration of a main lever arm or a lever arm. A lever arm can be designed for example due to its construction as a curved element, wherein for the function of the lever arm only the position of the rotary joints arranged in the lever arm is significant.

(32) The first main lever arm 37 is secured by means of the first rotary joint 38 to the base frame 24. The described rotary joints can here be in the form of any type of rotary joint known to a person skilled in the art such as bolts, roller bearings etc.

(33) The lever linkage system 25 also comprises a second main lever arm 40, on which a third rotary joint 41 and a fourth rotary joint 42 are arranged. The second main lever arm 40 is hereby secured by means of the third rotary joint 41 to the base frame 24.

(34) The first rotary joint 38 and the third rotary joint 41 are located in this case in a main bearing plane 43. The main bearing plane 43 also runs through the pivoting center 28.

(35) The lever linkage system 25 also comprises a support arm 44, which is connected by means of the second rotary joint 39 and the fourth rotary joint 42 to the first main lever arm 37 and the second main lever arm 40. The support arm 44 is designed so that in the installed state the first main lever arm 37 and the second main lever arm 40 are parallel to one another.

(36) Furthermore, the support arm 44 is parallel to the main bearing plane 43. In other words the standard interval 45 between the first rotary joint 38 and the second rotary joint 39 is the same as a standard interval 46 between the third rotary joint 41 and fourth rotary joint 42.

(37) The third rotary joint 41 is arranged here, as viewed in horizontal direction, closer to the connecting plane 22 than the first rotary joint 38. Furthermore, the third rotary joint 41 is arranged further up than the first rotary joint 38. The two main lever arms 37, 40 are oriented so that their second 39 and fourth rotary joint 42 in connection with the support arm 44 are further removed from the connecting plane 22 than their first 38 and third rotary joints 41 on the main bearing plane 43.

(38) By means of a fifth rotary joint 47 the support plate 17 is secured onto the support arm 44. The support plate 17 is hereby attached onto a part of the support arm projecting over the fourth rotary joint 42. Furthermore, on the support plate 17 by means of a sixth rotary joint 49 a support arm 50 is arranged which ensures the stability of the support plate 17.

(39) It is not absolutely necessary that the bearing surface 18 runs parallel to a connecting line between the fifth rotary joint 47 and sixth rotary joint 49.

(40) As shown in FIG. 2, it can be advantageous, if the support plate 17, in particular the thus described connecting lines between fifth rotary joint 47 and sixth rotary joint 49 and an extension of the bearing surface 18, run in a wedge-shape relative to one another and thus form a support angle 51. In this way it is possible for the installation space of the support device 15 to be kept as small as possible. However, it has to be ensured that an extension of these two lines intersects in the pivoting center 28.

(41) The support arm 50 is connected by a seventh rotary joint 52 to the first 37 or to the second main lever arm 40. The seventh rotary joint 52 is hereby positioned or the lengths of the individual lever arms are selected so that the support arm 50 runs parallel to the support arm 44. The seventh rotary joint 52 is also arranged in an extension of the straight line 53 between the first and second rotary joint 38, 39 or between the third or fourth rotary joint 41, 42.

(42) For the functionality of the lever linkage system 25 it is not essential whether the seventh rotary joint 52 is arranged on the first main lever arm 37 or on the second main lever arm 40. By means of the described structure there is a straight line which stretches between the fifth rotary joint 47 and sixth rotary joint 49 and which runs through the pivoting center 28 and is parallel to the first and to the second main lever arm 37, 40.

(43) In this way the virtual pivoting center 28 is formed during a pivot movement of the lever linkage system 25 between the basic position 26 and maximum position 27 of the virtual pivoting center 28.

(44) In order to position the lever linkage system 25 by means of the drive unit 32 a rocker 54 is provided, which is connected by means of an eighth rotary joint 55 to the already described crank 35 and by means of a ninth rotary joint 56 to the lever linkage system 25.

(45) In this case it is not important which connection point of the lever linkage system 25 the ninth rotary joint 56 is arranged on. It has been shown to be advantageous if the ninth rotary joint 56 is arranged on the support arm 50. However, it is also possible that the ninth rotary joint 56 is arranged for example on the support arm 44 or on the first or second main lever arm 37, 40.

(46) FIG. 3 shows a perspective view of a support device 15 wherein the latter is located in its maximum position 27. In this case it can be seen that a protective cover 57 is formed by means of which the inner parts, in particular the lever linkage system 25, are protected prior to engagement. The protective cover 57 is divided into several individual segments, whereby the latter can be moved telescopically with the support plate 17.

(47) Furthermore, it is possible that at the bottom end of the support device 15 protective bellows 58 are attached which are provided to sufficiently cover the inner parts of the support device 15 during a height adjustment of the base frame 24 relative to the connecting plate 19.

(48) Furthermore, it can be advantageous if the protective cover 57 has an openable side wall 59, through which the rotary drive 34 is accessible for maintenance purposes.

(49) FIG. 4 shows the support device 15 in a further perspective view, wherein in this view the protective cover 57 has been removed in order to reveal the lever linkage system 25. It is shown very clearly here that the lever linkage system 25 is not constructed in one plane, but the latter has a specific width, whereby a three-dimensional structure is formed and thus the whole system can be given a certain degree of stability.

(50) As shown, the rotary drive 34 can be arranged on a gear 60. Said gear can have two output shafts, wherein on each of the two output shafts a crank 35 can be arranged. Said two cranks 35 can be connected to two rockers 54, which can be connected to two support arms 50.

(51) According to the example embodiment shown here all of the individual parts of the lever linkage system 25 and the drive unit 32 are designed to have a lightweight structure as far as possible, wherein it is possible that recesses are formed inside the individual levers to achieve the lightweight structure. In order to make the whole system as small as possible, it can also be advantageous if the individual levers are not designed as simple straight components, but if the latter are designed as curved parts or have recesses in order to achieve the best possible internesting of the individual parts.

(52) It can be advantageous if the second main lever arm 40 or the support arm 44 have at least in some sections an external contour 62 adapted to the internal contour 61 of the protective cover 57.

(53) The individual connections referred to as rotary joints between the lever arms can be designed in the form of bolts as shown in the example embodiment, which are mounted in a slide bearing or roller bearing.

(54) It can be advantageous if relative to the width of the system a symmetrical or mirror arrangement of the individual lever elements is selected so that there are no tensions or internal forces from the transverse movement. The individual connecting bolts are designed here preferably as through bolts, whereby an unwanted formation of torque is avoided. Only the connecting bolts between the crank 35 and rocker 54 cannot be designed as through bolts for reasons of space. It is advantageous here if either the crank 35 or the rocker 54 is designed at least partly as a fork, so that the forces occurring in the eighth rotary joint 55 can be transmitted effectively and there is no disadvantageous loading.

(55) The FIGS. 5 and 6 show the support device 15 in a side view, wherein the support plate 17 in FIG. 5 is in its maximum position 27 and in FIG. 6 is in its basic position 26. The advantageous dimensions of the lever linkage system 25 are shown very clearly, which are shown in this embodiment variant. The optimal value ranges of the individual lengths have already been mentioned in the description of the advantages. Particularly, in combination with the drive unit 32 according to the invention the value details of the geometry of the lever linkage system 25 result in an embodiment, in which the internal forces can be minimized and installation space can also be reduced.

(56) An important geometric dimension is a first angle 63 between the crank 35 and rocker 54. As explained above, the connecting line is between the individual rotary joints of the geometry-relevant component. Furthermore, a second angle 64 is relevant, which extends between the crank 35 and the vertical connecting plane 22. The relevant geometric dimensions for creating the lever linkage system 25 are also the standard interval 65 between the fifth rotary joint 47 and sixth rotary joint 49, the standard interval 66 between the fourth rotary joint 42 and fifth rotary joint 47, the standard interval 67 between the ninth rotary joint 56 and seventh rotary joint 52, the standard interval 68 between the eighth rotary joint 55 and ninth rotary joint 56, the standard interval 69 between the center of rotation 36 of the rotary drive 34 and eighth rotary joint 55, the standard interval 70 between the first rotary joint 37 and second rotary joint 40, and the horizontal distance 71 between the first rotary joint 37 and third rotary joint 41 and the horizontal distance 72 between the first rotary joint 37 and center of rotation 36 of the rotary drive 34.

(57) Furthermore, in FIGS. 5 and 6 a guide rail 73 is shown in which the individual segments of the protective cover 57 can be guided.

(58) FIGS. 3 to 6 show a further and possibly independent embodiment of the support device 15, wherein the same reference numerals and components names have been used for the same parts as in the preceding FIGS. 1 and 2. To avoid unnecessary repetition reference is made to the detailed described of the preceding FIGS. 1 and 2

(59) The example embodiments show possible embodiment variants of the support device 15, whereby it should be noted at this point that the invention is not restricted to the embodiment variants shown in particular, but rather various different combinations of the individual embodiment variants are also possible and this variability, due to the teaching on technical procedure, lies within the ability of a person skilled in the art in this technical field.

(60) Furthermore, also individual features or combinations of features of the shown and described different example embodiments can represent independent solutions according to the invention.

(61) The underlying objective of the solutions according to the invention can be taken from the description.

(62) All of the details relating to value ranges in the present description are defined such that the latter include any and all part ranges, e.g. a range of 1 to 10 means that all part ranges, starting from the lower limit of 1 to the upper limit 10 are included, i.e. the whole part range beginning with a lower limit of 1 or above and ending at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1 or 5.5 to 10.

(63) Mainly the individual embodiments shown in FIGS. 1-2, 3-6 can form the subject matter of independent solutions according to the invention. The objectives and solutions according to the invention relating thereto can be taken from the detailed descriptions of these figures.

(64) Finally, as a point of formality, it should be noted that for a better understanding of the structure of the support device 15, the latter and its components have not been represented true to scale in part and/or have been enlarged and/or reduced in size.

(65) TABLE-US-00001 List of reference numerals 1 processing system 2 press brake 3 sheet metal 4 first adjustable pressing bar 5 first tool holder 6 first bending tool 7 second fixed pressing bar 8 second tool holder 9 second bending tool 10 sheet metal supporting surface 11 press drive unit 12 computer unit 13 input-display unit 14 manipulation device 15 support device 16 sheet metal leg 17 support plate 18 bearing surface 19 connecting plate 20 linear guide 21 horizontal direction 22 connecting plane 23 end face 24 base frame 25 lever linkage system 26 base position 27 maximum position 28 pivoting center 29 adjusting device 30 vertical direction 31 drive motor 32 drive unit 33 positioning drive 34 rotary drive 35 crank 36 center of rotation 37 first main lever arm 38 first rotary joint 39 second rotary joint 40 second main lever arm 41 third rotary joint 42 fourth rotary joint 43 main bearing plane 44 support arm 45 standard interval 1-2 46 standard interval 3-4 47 fifth rotary joint 48 protruding part 49 sixth rotary joint 50 support arm 51 support angle 52 seventh rotary joint 53 straight line 54 rocker 55 eighth rotary joint 56 ninth rotary joint 57 protective cover 58 protective bellows 59 side wall 60 gear 61 internal contour 62 external contour 63 first angle 64 second angle 65 standard interval 5-6 66 standard interval 4-5 67 standard interval 9-7 68 standard interval 8-9 69 standard interval central point-8 70 standard interval 1-3 71 horizontal distance 1-3 72 horizontal distance central point-1 73 guide