• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a lower tool (1) with a longitudinal displacement measuring device (2), which lower tool (1) is part of a bending tool arrangement for use in a bending press. The lower tool (1) has a tool body (3) with a longitudinal extension (4), in which longitudinal extension (4) a bending recess (5) is provided. The bending recess (5) extends from an upper flat side (6) of the tool body (3) in this and is at least formed by two contact surfaces (7). The transition from the upper flat side (6) into the bending recess (5) forms a contact edge (8), which contact edge (8) forms a lay-up line (9) in the longitudinal extent (4). In the area of the laying line (9) a sensor (10) for determining a longitudinal offset (18) is arranged, wherein a detection portion (11) of the sensor (10) is aligned in the direction of a sheet (16) to be bent.
    公开号:AT516260A4
    申请号:T50918/2014
    申请日:2014-12-17
    公开日:2016-04-15
    发明作者:
    申请人:Trumpf Maschinen Austria Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a bending tool with a longitudinal offset measuring device for use in a bending machine, in particular a swiveling and bending machine.
    When bending sheet metal parts, there is a great challenge in complying with the required bending geometry, since, in contrast to the embossing bending, the sheet metal part to be bent is not pressed against a contact surface of the tool. The bending geometry achieved depends on the force determined according to a model calculation or immersion depth, with which the sheet metal part is pressed into the lower tool of the bending tool assembly, or how far the bending blade is moved in the pivoting bending. The bending pressure with which the bending press presses the upper tool against the sheet metal part to be bent and consequently into the lower tool depends essentially on the material properties of the sheet metal part to be formed. Due to variations in the material parameters of the sheet metal part to be reshaped, in particular the sheet thickness and / or the Materialfestig¬keit, determined by the model press pressure or immersion depth, or the determined trajectory of the bending beam may not be correct for the currently performed bending deformation and thus give a deviating bending geometry, in particular a deviating bending angle and / or a wrong leg length. When swivel bending, there is a deviation from the desired bending angle primarily due to the return spring after the bending process. Precisely in the case of high-precision sheet-metal parts with a large number of individual bending processes, errors in the bending geometry can quickly add up to the extent that the sheet-metal part can no longer be used.
    It is therefore advantageous if the currently achieved bending geometry can already be determined during the execution of the bending deformation and thus can be used directly for controlling or influencing the bending process.
    In the case of swivel bending, the term pivoting is understood here to mean that the movement path of the bending beam can have a general course, as viewed in the direction of the bending line. In a special case, this may be a circular path, with the clamping point of the sheet through the Niederhalterwerk¬zeuge as the center. In particular, the movement path can also have a complex course. Thus, it can be achieved that as little sliding movement of the sheet as possible relative to the bending beam occurs and thus a high surface quality can be achieved.
    In the case of bending sheet metal parts, the sheet to be bent is placed in a bending saw assembly, which bending tool arrangement is formed at least from a lower tool and an upper tool. The bending tool arrangement is used in a bending machine, wherein drive means are controlled by means of a machine control in such a way that the bending deformation is carried out. Preferably, the upper tool, also referred to as a bending punch, is moved by drive means of the bending machine in the direction of the lower tool known as a bending die, as a result of which the sheet to be formed is pressed into the bending recess.
    When swivel bending the sheet is clamped between the upper and lower Nieder¬halterwerkzeug, the upper or the lower bending cheek positioned in front of the plate and by pivoting the bending cheek, performing the bending deformation. In this case, the required bending angle can be predetermined by the pivoting angle, but due to the movement trajectory, a bending radius which is not exactly known will result, and thus also the angle can not be exactly predetermined. In addition, springback will also occur here, which is significantly affected by the variation in material properties.
    Due to material tolerances of the sheet to be bent, it may occur that the required bending geometry is not maintained with the determined bending parameters, in particular for the determined pressing force and / or immersion depth or the pivoting angle. For example, a wrong bending angle can occur and / or due to a deviation from the expected or calculated bending shortening, an undesirable leg length can be set. To avoid costly and time-consuming retiming of the currently achieved bending geometry, devices are known from the prior art in which, for example, the current bending angle is determined during the bending process. In addition to contact-type measuring devices, in particular contactless operating systems are known. For example, WO 2012/155168 A1 discloses an optically operating system in which the bending angle can be measured at any position along the bending line. The disclosed system has a light source which is displaceably arranged along the press beam. Furthermore, an image acquisition device is arranged on the front side of the bending die. Via special optics and an image analysis and evaluation method, the determined images of the portion illuminated on the sheet metal become the bending angle prevailing there determined. In the disclosed system, however, a conversion of the bending press is required, in particular, the Beleuchtungsvorrich¬ and the image capture device to be attached to the bending press.
    The object of the invention is now to improve a bending process to the effect that even during the execution of the bending deformation, the adjusting bending geometry can be determined. In particular, without costly retooling, this should be universally applicable to a variety of bending machines. The design should also be designed to be very compact, so as to be as protected as possible against the loads occurring during the intended bending process.
    The object of the invention is achieved by a bending tool with a longitudinal offset measuring device, which bending tool is part of a bending tool arrangement for use in a bending machine. In the Biegewerkεzeuganordnung a to be bent sheet is arranged, further, the bending has
    Tools a tool body with a longitudinal extension, which longitudinal extension is aligned parallel to a bending line. Aligned parallel to this longitudinal extension and in the direction of the sheet to be bent, two contact surfaces or at least one contact edge are formed. In the region of the contact edge or in a contact surface, a sensor for determining a longitudinal offset is arranged, wherein a detection section of the sensor is aligned in the direction of a sheet to be bent.
    The further components of a bending machine required for carrying out bending deformation are not described further. In particular, as is known, it is assumed that a sheet is formed by relative movement of the components of the bending tool arrangement and thus the desired bending geometry is formed. In this case, one tool component usually remains at rest relative to the bending machine, and the other, subjected to a force by a drive means of the bending machine, performs the bending deformation. However, an embodiment is also included, in which move several components of the Biegewerkεzeuganordnung relative to each other.
    The laying edge or laying line is understood to mean that section of the bending tool which has contact with the sheet during the bending operation and thus the predominant part of the pressing force applied to the bending tool by a drive means of the bending machine, acts on the sheet and thereby the Biegeumformung performs. This Anlegekante or Anle¬gelinie can be a structurally existing edge on the bending tool, but it is also possible that this edge or line by an imaginary Kantebzw. Line is formed, which has contact with the sheet metal during the bending deformation and corresponds to the constructive edge or line.
    According to a development, it is provided that the sensor is arranged without offset in relation to the contact edge or lay-up line. This means that the position of the sensor in relation to the laying edge or laying line is not changed by the sheet pressed into the bending recess or by the sheet sliding off the bending tool.
    A further development consists in the fact that the sensor is formed ver-pivotable about the lay line. This can be realized, for example, in that the base body has a section in which the lay-up line is interrupted and in which section the sensor is arranged. This ensures that the sensor, in particular the detection section of the sensor, can align itself with the sheet during the entire bending transformation.
    A further embodiment consists in that the bending tool is designed as a sub-tool of a bending press and that the contact surfaces are formed by pivoting jaws, which pivoting jaws are pivotable about a, parallel to the laying line axis of rotation. When bending sensitive Blechober¬flächen, especially if it must not interfere with the surface quality by the bending process, such pivoting jaws are used. These are applied to the sheet during the bending process so that a distribution of the pressing force over a larger area occurs. In this embodiment, the contact edge or landing line is to be understood as the imaginary edge or line on which the force vector of the pressing force is directed by the metal sheet into the tool body of the lower tool.
    A development in which the bending tool is designed as a lower tool of a bending press, also consists in that the contact surfaces form a Biegeaus¬nehmung a V-shaped bending die, which Biegeausnehmung from an upper flat side of the tool body and in the direction away from um¬zuformenden Sheet metal, extending into the tool body. In free bending, the achievable accuracy of the bending geometry to be formed depends greatly on the insertion of the sheet into the lower tool. If this indentation is determined during the bending deformation, it is possible to intervene directly in a corrective manner, for example by adjusting the insertion depth of the bending punch into the bending die.
    According to a development it is provided that the sensor is formed by a lighting and an image capture device. Preferably, the illumination device is designed as an LED or laser, the image acquisition device is designed as a 2D image sensor. Such systems are known, for example, from computer technology and are used there in optical mice. The advantage lies in the fact that due to the wide distribution, very compact and cost-effective sensor modules are available. These modules illuminate a surface portion and capture images of the illuminated portion in rapid succession, which images are fed to further processing.
    A further development is also that the sensor is formed by a transmitter and receiver for electromagnetic radiation. Since the sheets to be bent are mostly made of metal, it is also possible to detect a longitudinal offset based on an eddy current measurement. In this case, the transmitter generates a magnetic vortex field in the metal sheet, which induces a voltage in a receiver when the sheet moves as a result of the bending.
    By selecting the excitation frequency and by constructive design or offset of transmitter and receiver coils, it is possible to deduce from the induced voltage the longitudinal offset causing this voltage.
    A development also consists in that the sensor is arranged in a recess at least one of the contact surfaces. For detecting the Längsver¬satzes it is important that the sensor is arranged as close to the Blechober¬fläche. According to a development, it is provided that a detection flat side of the sensor is spaced from the contact surface by an offset from the application surface, arranged in the tool body. This ensures that the sensor is not damaged by the plate sliding along the sensor. Due to the force exerted by the upper tool during the bending process, the sheet is pressed against the contact edge or contact surfaces and moves as the bending progresses further into the bending recess. Preferably, the detection surface of the sensor is located in the detection flat side. By the claimed offset is now ensured that the sheet during the longitudinal movement relative to the sensor, not applied to this and possibly the Erfas¬sungsfläche damaged. This development is particularly advantageous for non-contact arbei¬tende sensors.
    In addition to a use of the subject bending tool in a bending press, for free or stamped bending, the bending tool can also in a
    Swivel bending machine can be used. Therefore, according to a development, the bending tool is designed as a bending cheek of a folding machine. During pivoting bending, the sheet metal part to be formed is not pressed by an upper tool into a lower tool, but the sheet clamped by the holding tool is bent by the bending cheek to the desired angle. Since the basic features are comparable in the case of pivoting as well as free bending or embossing bending, the abovementioned embodiments can thus also be transferred to a folding machine.
    A development consists in that the sensor is arranged in a section of a front end of the bending cheek, which front end contacts the sheet during the execution of the bending deformation. This development ensures that the sensor always has contact with the metal sheet during the execution of the bending deformation, and thus there is continuous detection of the relative displacement.
    According to a further development, it is also provided that a contact element is arranged in the region of the front end, which contact element is pivotable about the contact edge or pivotable about an axis parallel to the contact edge, said contact element transmitting no pressing force to the metal. By the specific movement of the bending blade in the pivoting bending, it may happen that the line of contact with which the bending blade contacts the sheet slightly changes in position in relation to the front end of the bending beam. Thus, the orientation of the sensor to the sheet may change, which could eventually lead to a detection error. With this advanced training it is ensured that the sensor always remains correctly aligned with the sheet metal.
    In this respect, a development also consists in the fact that the contact element has a flat side, in which the sensor is arranged and which flat side bears against the sheet metal during the bending process.
    A development also consists in the fact that the contact element is designed as a sensing disk, which touch disk rolls in the bending deformation of the sheet.
    Thus, the sensor detects a relative movement between the contact disk and the front end of the bending cheek.
    According to a development, it is provided that the sensor is formed as an insert. Thus, for example, a lower tool can be created, which can be equipped if necessary with a sensor. Respectively, differently shaped sensors can be used with a lower tool. Or a sensor can be used in different sub-tools. The same applies to a bending cheek with a sensor designed in this way.
    According to a further development, it is further provided that the sensor is connected to an evaluation circuit, which is further connected or integrated with a machine control. With this development it is achieved that the longitudinal offset determined by the sensor flows into the bending process during the bending process, in particular that the machine control stops the bending process when the desired bending geometry is reached.
    It is further provided that the evaluation circuit has an image analysis and a comparison module. The sensor is periodically, in particular in rapid order, an image of the illuminated portion of the sheet surface determined. Each sheet surface has characteristics due to its production. By the longitudinal offset to be detected, the position of these features will differ between the individual acquired images. Taking into account the image acquisition frequency, the desired longitudinal offset can be determined by accumulation of the individual offset values.
    A refinement also consists in that the image analysis and comparison module is designed to determine a one-dimensional or two-dimensional motion vector for the longitudinal offset. Ideally, only a one-dimensional longitudinal offset occurs during the bending process. The descending upper tool will push the sheet into the bending recess, with longitudinal movement being perpendicular to the lay line. Due to nonuniform material parameters of the sheet to be bent, or an unevenly descending upper tool, it may occur that the upper tool has a force component in the direction parallel to the contact edge on the sheet brings. However, this will lead to an undesirable bending result. Therefore, it is advantageous if a two-dimensional motion vector for the longitudinal offset is determined, as this can be used to detect a distortion and thus stresses in the sheet. Similarly, it can also occur during pivoting bending due to such fluctuating material parameters that the bending radius along the bending line is not uniform, and thus also results in a deviating bending geometry.
    In addition to contactless measuring principles, however, it is also possible according to a development that the sensor is formed by a rolling device. The unwinding device, for example a wheel with a surface structure, rests on the sheet metal surface and, for example, determines the longitudinal offset directly via a rotary encoder.
    The object of the invention is also achieved by a method for determining the bending geometry in bending. This method is carried out on a bending press with a bending tool arrangement, which bending tool arrangement comprises a lower and an upper tool, wherein the lower tool is designed according to the representational embodiments. In this case, a sheet metal part to be bent is inserted into the bending tool arrangement and the free-bending deformation is carried out by pressing the sheet metal part from the upper tool into a bending recess of the lower tool by lowering the upper tool. In this case, before starting the bending deformation, a surface of the sheet metal part to be bent is brought into contact with a sensor for determining a longitudinal offset and determined for this contact point, reference coordinates of the sheet surface with respect to the bending machine or Biege¬werkzeuganordnung. During the bending deformation, a longitudinal offset of the sheet metal surface in relation to the sensor is determined, and furthermore the current bending geometry is determined by an evaluation circuit from the determined longitudinal offset, in accordance with a mathematical model of bending deformation.
    After the position of the sensor, or the contact point of the sensor with the sheet metal surface, with respect to the bending machine or the bending tool arrangement is determined before the beginning of the bending deformation, during bending deformation, each relative movement of the sheet relative to the sensor can be determined a reference to the bending machine or to the bending tool arrangement are trans¬formiert.
    The reference coordinates determine the position of a point of the sheet (the sheet surface) with respect to the bending machine and / or the bending tool arrangement. As a result of the insertion of the sheet into the bending recess of the lower tool, the sheet will move about the longitudinal offset to be determined relative to this determined reference point.
    The object of the invention is also achieved by a method for determining the bending geometry during the pivoting bending carried out on a Schwenkbiegema-machine with a bending tool assembly. The bending tool assembly comprises a hold-down tool and at least one bending cheek, wherein a bent sheet metal part is inserted in the bending tool assembly and the free-bending deformation is carried out in that the sheet metal part is clamped by the holding tool and the bending cheek on the sheet metal part and moved by a trajektorie is moved. The bending cheek is formed according to the gen¬genlichen execution. In particular, before the start of the bending deformation, a surface of the sheet metal part to be bent is brought into contact with a sensor for determining a longitudinal offset. For this contact point reference coordinates of the sheet surface are determined in relation to the swivel bending machine or the bending tool assembly. During bending deformation, a longitudinal offset of the sheet surface with respect to the sensor is determined, and from an evaluation circuit, the current bending geometry is determined from the determined longitudinal offset, according to a mathematical model of bending deformation.
    According to a development, it is provided that during the determination of the longitudinal offset, the sensor is held stationary with respect to the reference coordinates. When contacting the sheet surface by the sensor is determined by the
    Reference coordinates a reference with respect to the sheet metal surface determined, based on which or with respect to which, the longitudinal offset is determined. With this further development, it is ensured that, irrespective of the movement of the sheet metal part during the execution of the free-bending deformation, the sensor remains stationary with respect to this reference. The sensor will follow a possible bending of the sheet or the sheet metal leg, the position in relation to the reference, however, ever retained.
    A development consists in that the lower tool is designed in accordance with one of the embodiments and the sensor determines the longitudinal offset of the metal sheet relative to the contact edge of the lower tool. As a result of this arrangement, the position of the sensor is determined by geometric Abmessun¬gen the lower tool, the determination of the reference coordinates by knowledge of the tool geometry.
    A further development can also consist in that the sensor is arranged by means of a pivoting device in the region of the upper tool or on a press table of the bending press, wherein the bending device follows the bending sheet during the bending deformation. Thus, further possibilities are given for the universal arrangement of the sensor. In particular, this makes it possible to subsequently place the sensor or the pivoting device on an existing bending press without the need for retrofitting or retrofitting.
    For a better understanding of the invention, this will be explained in more detail with reference to the following figures.
    In each case, in a highly simplified, schematic representation:
    Fig. 1 shows a possible embodiment of the subject Biegewerkѕzeugs;
    FIG. 2 shows another possible embodiment of the present bending tool; FIG.
    Fig. 3 a) and b) the conditions during the bending process with a mögli¬chen embodiment of the bending tool;
    4 shows a detailed view of the sensor;
    Fig. 5 shows an embodiment of the subject bending tool for swivel bending.
    Fig. 1 shows an embodiment of an objective bending tool 1 with a longitudinal offset measuring device 2, wherein the bending tool 1 is designed as a lower tool for free bending. The bending tool 1 has a tool body 3 with a longitudinal extension 4, in the direction of which longitudinal extension 4 a bending recess 5 is provided. The bending recess 5 extends from an upper flat side 6 of the tool body 3 in this and is formed by two contact surfaces 7. The transition region from the upper flat side 6 into the bending recess 5 forms a contact edge 8. It is further provided that in the region of the contact edge 8, a sensor 10 is arranged, which sensor 10 is designed to determine a longitudinal offset of the sheet to be bent in relation to the sensor. For this purpose, a detection section 11 of the sensor 10 is aligned in the direction of the sheet to be bent.
    In FIG. 1, the sensor 10 is arranged only in the region of a contact edge 8, but it is nevertheless possible that a sensor is also arranged on the second, opposing contact edge 8.
    The sensor 10 is further connected to an evaluation circuit 12, which Aus¬werteschaltung 12 is connected to a machine control, not shown, or. is integrated into this. It may further be provided that the evaluation circuit 12 has an image analysis and comparison module.
    In the description of Fig. 1 is spoken by contact surfaces 7, it being noted that the bending process is not carried out until the sheet is applied to the contact surfaces 7 - this would be a Prägebiegen. When Freibie¬gen the sheet is pressed into the bending recess 5 and that only so far until the desired bending geometry is reached.
    2 shows another possible embodiment of the present bending tool 1. In this embodiment, the contact surfaces 7 are formed by pivoting jaws 13, which pivoting jaws 13 are pivotable about an axis 14 parallel to the laying line 9. In this embodiment, the contact surface 7 also forms the upper flat side 6 of the tool body 3 at the same time.
    A bending tool 1 with swivel jaws 13 has the advantage that the sheet to be bent is placed on the upper flat side 6 or the contact surfaces 7 and is supported by this over a large area. In contrast to the arrangement shown in FIG. 1, there is therefore no linear force loading along the application line 9 during the bending process. As soon as the sheet to be bent is pressed into the bending recess 5 by the unillustrated bending punch, the swivel jaws 13 are rotated about the pivot axis 14 pivot, so that the sheet to be bent is always supported by the entire flat side of the contact surface 7 of each pivoting jaw 13. At the conclusion of the bending process, the pivoting jaws 13 are completely swung open, so that a bending recess 5 is formed with continuous contact surfaces - indicated in dashed lines in the figure.
    In the area of the laying line 9, a sensor 10 for determining a Längsversat¬zes is arranged, wherein a detecting portion 11 of the sensor is aligned in the direction of the sheet to be bent.
    To simplify the illustration, the sheet to be bent is not shown both in FIG. 1 and in FIG. 2. However, it is clear to the person skilled in the art that the sheet to be bent is placed on the upper flat side 6 of the tool body 3. During the deformation of the sheet metal part by the niederfahren¬den press ram, the sheet is pressed into the bending recess 5, wherebysich the sheet will move relative to the laying line 9. In particular, normal to the laying line 9 in the direction of the lower low point of the bending recess 5, this longitudinal offset being detected. So that the sensor 10 is not damaged by this longitudinal offset of the sheet pressed against the contact surface 7 by the bending force, it can be provided that the sensor 10 is offset by an offset 15 in relation to the contact surface 7.
    2, in turn, only one sensor 10 is shown in a contact surface 7, but it is equally possible that in both contact surfaces 7 each have a sensor 10 is arranged.
    FIGS. 3 a and 3 b show the determination of the bending geometry, in particular the chip length, by determining the longitudinal offset of the sheet to be bent by means of an embodiment of the bending tool 1 with pivoting jaws 13.
    Fig. 3a shows the situation in the initial state, in which on the contact surface 7 of the swivel jaw 13 a metal sheet 16 to be formed is arranged. The pivoting jaws 13 are pivotable about a, parallel to the laying line 9 pivot axis 14. The sensor 10 is arranged in the region of the contact edge or Anlege¬ line 9, that there is no displacement of the sensor in relation to the laying line 9 and thus exclusively determines a relative movement of the sliding sheet 16 relative to the sensor 10 at a pivoting of the pivoting jaws 13 becomes.
    From the bending punch, not shown, a force 17 is exerted on the sheet 16 during the bending process, whereby this is pressed into the Biegeaus¬nehmung 5. In this case, the pivoting jaws 13 pivot about the axis 14, so that always the contact surfaces 7 of the pivoting jaws 13 rest against the plate 16.
    Since the sheet 16 is pressed into the bending recess 5 during the bending operation, there will be a relative movement between the sheet 16 and the contact surface 7. A surface point 19 will therefore move relative to the sensor 10. This situation is shown in Fig. 3b.
    FIG. 3 b shows the state when the desired bending deformation is achieved; in particular, both pivoting jaws 13 are completely swung open by the sheet 16 pressed into the bending recess 5.
    It can also be seen in FIG. 3 that the bending operation results in a longitudinal offset 18 of a surface point 19 between the starting position (FIG. 3 a) and the end position (FIG. 3 b). To clarify the situation, the
    Representation of the longitudinal offset significantly exaggerated. In particular, this longitudinal offset 18 has a direct influence on the reached limb length of the bent sheet-metal part 16. As already mentioned, the pressing force and / or the immersion depth are determined on the basis of a mathematical model of the bending deformation. In particular, the nominal sheet thickness and desired strength of the sheet have a significant influence on the determined parameters. In the case of deviations from these desired values, it may thus occur that a deviating bending angle is achieved and / or that a different limb length is established, ie a different bending geometry overall is achieved. Beikomplexen to be bent sheet metal parts, but the leg length to be achieved is of particular importance, since deviations can very quickly summon over given tolerances.
    By ascertaining the current longitudinal offset 18 and comparing it with a desired longitudinal offset determined from the bending model, it is possible to deduce immediately the actual, actual leg length.
    In addition to the currently achieved leg length, the determined bending angle can also be deduced via the determined longitudinal offset 18. By knowing the depth of immersion, this value is determined by the press control of the press brake, and the longitudinal offset 18, it is possible, via the mathematical model of bend forming, to determine the currently achieved bending angle. With the nominal values of the bending parameters, a specific course of the material deformation between lay-up line 9 or contact edge 8 and the contact point of the bending punch will be established on the basis of the model. This deformation course will also cause a specific longitudinal offset 18. If the material characteristics deviate from the desired values, a deviation of the average longitudinal offset from the expected longitudinal offset will occur in particular. Thus, the currently achieved bending geometry and in particular a deviation from the expected value can be determined.
    4 shows a detailed representation of the sensor 10 for determining a longitudinal offset using the example of a bending tool with swivel jaws. The described conditions can be converted directly to a lower tool for bending. The sensor 10 is arranged in the tool body 3 of the bending tool 1 in such a way that during the bending operation there is no offset of the sensor 10 relative to the laying line 9 or the Leading edge comes. The sheet to be bent 16 rests on the contact surface 7, and is pressed by the approaching bending die around the laying line 9 or contact edge against the contact surfaces 7 and thus bent.
    Due to the bending process, the sheet 16 is pressed in the direction of the bending recess, so that a virtual surface point 19 of the sheet metal surface will move relative to the sensor 10.
    According to one possible embodiment, the sensor 10 is formed by a lighting-21 and image-sensing device 22. Due to the ever-present surface structure of the sheet metal surface 20 is illuminated by the image sensing device 22, during the relative movement of the sheet 16 with respect to the sensor 10, of the illumination device 21, a portion on the sheet surface 20 is illuminated. a continuously changing surface pattern is recorded. The acquired images are processed and analyzed by an evaluation circuit, not shown, in order to determine a motion vector from successive images of the illuminated surface section. Based on the knowledge of the image acquisition frequency and the determined motion vector, the real longitudinal offset can be determined. About this longitudinal offset and knowledge of the geometry of the bending tool 1, in particular the bending recess, the current bending angle and the currently reached leg length can be determined.
    Such an embodiment of a sensor 10 with an illumination 21 and image detection device 22 is known, for example, from optical computer mice. There, from the movement of the sensor in relation to a surface, in particular a table surface, the movement of the computer mouse is detected and converted into the movement of a pointer on the screen.
    In order to protect the sensor 10 with respect to the sheet metal 16 moving past the contact surface 7 or the application line 9, provision may be made for the detection section 11 of the sensor 10 to be spaced apart from the contact surface 7 by an offset 15. This ensures that the sheet 16, which is pressed against the contact surface 7 or the contact edge with high pressure, does not damage the detection section 11 during the relative movement.
    The advantage of the subject lower tool now lies in particular in the fact that essentially every bending machine can be equipped with the functionality of a bending geometry monitoring without the need for constructive changes to the bending machine. An existing set of lower tools may be extended by an objective lower tool, thus allowing monitoring of the bending process and compliance with the desired bending geometry while performing the bending forming. Also, the objective functionality may be used in a folding machine where the ratio described for the lower tool is transferred to the bending beam become.
    5 shows a bending tool arrangement for use in pivoting bending, wherein the bending tool 1 is designed as a bending cheek 23. The Biegewerkεzeuganordnung further includes a hold-down tool 24, wherein the um¬zuformende sheet 16 is clamped between the upper and lower hold-down tool. In a front end 25 of the bending cheek 23, the sensor 10 is arranged, wherein the light emitting direction of the lighting device 21 and the detection range of the image sensing device 22 is aligned in the direction of the Oberflä¬ 20 of the sheet 16 to be formed.
    FIG. 5 a shows the situation before the beginning of the bending deformation, in which the bending wedge 23 rests with or along the contact edge 8 on the surface 20 of the sheet 16. For this contact point, the coordinates of a surface point 19 in relation to the bending tool arrangement or in relation to the bending machine are determined. The further details of the reference formation of the surface point 19 were already described above.
    Fig. 5b shows the situation after carrying out the bending deformation, in which the bending cheek 23 was moved by a drive means of the bending machine along a path, and the bending cheek 23 is now in an end position. By the pivoting movement of the bending cheek 23 has also the Oberflä¬chenpunkt 19 displaced by the longitudinal offset 18 relative to the front end 25 of the Biege¬ cheek 23. From this longitudinal offset 18 and the knowledge of the trajectory of the bending cheek 23, the mathematical model of the bending deformation can be deduced from the course of the bend between the front end 25 of the bending cheek and the holding-down tool 24.
    Compared to a bending press, there are many possibilities for influencing the trajectory of the bending cheek 23 with a folding machine. Therefore, when recognizing a deviating from the desired course of Längsversatzes18, intervened corrective and the trajectory are adapted accordingly to still be able to form the desired bending geometry can.
    FIG. 5 also shows a further possible embodiment in which a contact element 26 is arranged in the region of the front end 25 of the bending cheek 23. Due to the very complex course of the trajectory, along which the bending cheek 23 is pivoted, it can occur that the An-laying edge 8 is not stationary in relation to the bending cheek 23 remains. This situation can also be seen in FIG. Due to the knowledge of the geometry of the bending cheek 23 in the region of the contact edge 8, this offset can be taken into account and thus has only a slight effect on the determination of the longitudinal offset 18. However, there may be an accuracy requirement on the bending geometry that requires consideration of this shift in the abutment edge 8. The development with a contact element 26 now has the advantage that a decoupling of the introduction of force from the drive means of the bending machine in / on the sheet, from the detection of the longitudinal offset 18 is possible.
    This contact element 26 is formed, for example, as a touch disk and preferably also has a flat side, which bears against the sheet 16 and thus follows the pivoting of the sheet 16 in relation to the bending beam 23. Since the contact element 26 is not subjected to force and therefore does not have to perform forming work, the pivotable mounting can be designed very smoothly.
    As a result, a very good adaptation to the bending sheet metal is possible and thus ensures an accurate detection of the longitudinal offset 18.
    In addition, it is preferred if the sensor 10 follows in its orientation the pivoting movement of the contact element 26, for example. By a non-positive and / or formschlüssige connection between the sensor and the contact element exists.Dadurch is always a same orientation of the sensor for Sheet metal ensured and the measurement result for the longitudinal offset can not be affected by a varying alignment between the sensor and sheet metal.
    Finally, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component designations, wherein the disclosures contained in the entire description mutatis mutandis to the same parts with the same Bezugsbe or. same component names can be transferred. Also, the location information chosen in the description, such as up, down, laterally, etc. related to the directly described and illustrated figure and these conditions are to be transferred in a change in position mutatis mutandis to the new situation.
    FIGS. 2 and 5 show further and optionally independent embodiments of the present bending tool, again using the same reference numerals or component designations for the same parts as in the previous figure. To avoid unnecessary repetition, reference is made to the detailed description in the preceding figure.
    The embodiments show possible embodiments of the Biegewerkεzeugs, it being noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but vielmehrauch various combinations of the individual embodiments are inter alia possible and this possibility of variation due to the teaching of technical action by subject invention in Can the expert working in this technical field.
    Furthermore, individual features or combinations of features from the different embodiments shown and described can also represent solutions that are inventive, inventive or inventive.
    The problem underlying the independent inventive solutions can be taken from the description. All statements on ranges of values in the description given herein are to be understood as including any and all subsections thereof, for example, the indication 1 to 10 should be understood as encompassing all subranges, starting from the lower bound 1 and the upper bound 10, i. all subregions begin with a lower limit of 1 or greater and end 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.
    Above all, the individual embodiments shown in FIGS. 1 to 5 can form the subject of independent solutions according to the invention. The related objects and solutions according to the invention can be found in the detailed descriptions of these figures.
    For the sake of order, it should finally be pointed out that in order to better understand the construction of the bending tool, this or its constituent parts have been shown to be out of scale and / or enlarged and / or reduced in size.
    LIST OF REFERENCE NUMERALS 1 bending tool 2 longitudinal displacement measuring device 3 tool body 4 longitudinal extension 5 bending recess 6 flat side 7 contact surface 8 contact edge 9 landing line 10 sensor 11 detection section 12 evaluation circuit 13 pivoting jaws 14 pivot axis 15 offset 16 plate, sheet metal part 17 force 18 longitudinal offset 19 surface point 20 sheet surface 21 lighting device 22 image acquisition device 23 bending cheek 24 hold-down tool 25 front end 26 contact element
    权利要求:
    Claims (24)
    [1]
    1. Bending tool (1) with a longitudinal offset measuring device (2), which bending tool (1) is part of a bending tool arrangement for use in a bending machine, wherein in the bending tool assembly a sheet metal (16) to be bent is arranged, and wherein the bending tool (1) a tool body (3) having a longitudinal extent (4), which longitudinal extent (4) is aligned parallel to a bending line, and aligned parallel to this longitudinal extent (4) and towards the sheet (16) to be bent, two Anlegeflächen (7) or at least one contact edge (8) is formed, characterized in that in the region of the contact edge (8) or in a contact surface (7), a sensor (10) for determining a longitudinal offset (18) is arranged, wherein Detection section (11) of the sensor (10) in the direction of a sheet to be bent (16) is aligned.
    [2]
    2. Bending tool according to claim 1, characterized in that the sensor (10) without offset in relation to the contact edge (8) or laying line (9) is arranged.
    [3]
    3. Bending tool according to one of claims 1 or 2, characterized gekenn¬zeichnet that the sensor (10) around the lay line (9) is formed pivotable.
    [4]
    4. Bending tool according to one of claims 1 to 3, wherein the Biege¬ tool is designed as a lower tool of a bending press, characterized gekenn¬zeichnet that the contact surfaces (7) by pivoting jaws (13) are formed, which pivoting jaws (13) to a for laying line (9) parallel axis of rotation (14) are pivotable.
    [5]
    5. Bending tool according to one of claims 1 to 3, wherein the Biege¬ tool is designed as a lower tool of a bending press, characterized gekenn¬zeichnet that the contact surfaces (7) form a bending recess (5) of a V-shaped bending die, which Biegeausnehmung from a upper flat side (6) of the tool body (3) and in the direction away from the sheet (16) to be formed, in the tool body (3).
    [6]
    6. Bending tool according to one of claims 1 to 4, characterized gekenn¬zeichnet that the sensor (10) by an illumination (21) and a Bildfas¬sungsvorrichtung (22) is formed.
    [7]
    7. Bending tool according to one of claims 1 to 4, characterized gekenn¬zeichnet that the sensor (10) is formed by a transmitter and receiver for elektro¬magnetische radiation.
    [8]
    8. Bending tool according to one of claims 4 to 6, characterized gekenn¬zeichnet that the sensor (10) in a recess at least one of the Anlege¬flächen (7) is arranged.
    [9]
    9. Bending tool according to one of claims 4 to 8, characterized gekenn¬zeichnet that a detection flat side of the sensor (10) by an offset (15) from the contact surface (7) distances, in the tool body (3) is arranged.
    [10]
    10. Bending tool according to one of claims 1 to 9, characterized gekenn¬zeichnet that the bending tool is a bending cheek (23) of a Schwenkbiegema-machine.
    [11]
    11. Bending tool according to claim 10, characterized in that the sensor (10) in a portion of a front end (25) of the bending cheek (23) is arranged, which front end (25), the sheet (16) during the execution of the Biegeumformung contacted.
    [12]
    Bending tool according to claim 11, characterized in that in the area of the front end (25) a contact element (26) is arranged, which contact element (26) can be pivoted relative to the bending beam (23) about the contact edge (8) or around the contact edge (8) is held rotatably parallel axis.
    [13]
    13. Bending tool according to claim 12, characterized in that the contact element (26) has a flat side, in which the sensor (10) is arranged and which flat side bears against the sheet metal (16) during the bending process.
    [14]
    14. Bending tool according to claim 12, characterized in that the contact element (26) is designed as a touch disk, which touch disk rolls in the bending deformation of the sheet (16).
    [15]
    15. Bending tool according to one of claims 1 to 10, characterized gekenn¬zeichnet that the sensor (10) is designed as an insert.
    [16]
    16. Bending tool according to one of claims 1 to 11, characterized gekenn¬zeichnet that the sensor (10) with an evaluation circuit (12) is connected, which is further connected to a machine control or integrated into it.
    [17]
    17. Bending tool according to claims 5 and 12, characterized gekennzeich¬net that the evaluation circuit (12) has an image analysis and a comparison module.
    [18]
    18. Bending tool according to claim 17, characterized in that the image analysis and comparison module is adapted to determine a one-dimensional or two-dimensional motion vector for the longitudinal offset (18).
    [19]
    19. Bending tool according to one of claims 1 to 14, characterized gekenn¬zeichnet that the sensor (10) is formed by a rolling device.
    [20]
    20. A method of determining flexural bending geometry carried out on a press brake with a bending tool assembly, which bending tool assembly includes a bottom and top tool, the bottom tool of any one of claims 1-9 and 15-19, and wherein a sheet metal part to be bent enters the bending tool assembly is inserted and the free-bending deformation is carried out in that is pressed by a Niederfah¬ren of the upper tool, the sheet metal part from the upper tool in a Biegeausneh-mung of the lower tool, characterized in that before the start of the bending deformation, a surface of the sheet metal part to be bent is brought into contact with a sensor for detecting a longitudinal offset; and determining reference coordinates of the sheet surface with respect to the bending machine or the bending tool assembly for that contact point, and determining a longitudinal offset of the sheet surface with respect to the sensor during the bending forming; and that the current bending geometry is determined by an evaluation circuit from the determined longitudinal offset, according to a mathematical model of bending deformation.
    [21]
    21. A method of determining bend geometry during swing bending carried out on a pivoting bending machine with a bending tool assembly, said bending tool assembly comprising a hold down tool (24) and at least one bending cheek, wherein a sheet metal part to be bent is loaded in the bending tool assembly and the free bending deformation is performed by holding the sheet piece from the hold down tool (24) is clamped and the bending cheek (23) is applied to the sheet metal part and is pivoted along a trajectory, and wherein the bending cheek (23) according to any one of claims 1-3, 6-7 and 10-19 is formed, characterized in that, before the start of the bending deformation, a surface of the sheet metal part to be bent is brought into contact with a sensor for determining a longitudinal offset; and that for this contact point, reference coordinates of the sheet surface with respect to the folding machine or the bending tool assembly are determined; and during sheet forming, determining a longitudinal offset of the sheet surface with respect to the sensor; and that the current bending geometry is determined by an evaluation circuit from the determined longitudinal offset, according to a mathematical model of bending deformation.
    [22]
    22. The method according to claim 20, characterized in that during the determination of the longitudinal offset, the sensor is held stationary with respect to the reference coordinates.
    [23]
    23. The method according to claim 20 or 22, characterized in that the lower tool is designed according to one of claims 1 to 14 and the sensor of the longitudinal offset of the sheet is determined in relation to the contact edge of the Unterwerkzeugs.
    [24]
    24. The method according to any one of claims 20 to 23, characterized gekennzeich¬net that the sensor is arranged by means of a pivoting device in the region of the upper tool or on a press table of the bending press, wherein during the bending deformation, the pivoting device follows the aufbiegendenBlech.
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    同族专利:
    公开号 | 公开日
    AT516260B1|2016-04-15|
    US10464114B2|2019-11-05|
    US20170333967A1|2017-11-23|
    WO2016094918A1|2016-06-23|
    EP3233323B1|2019-12-11|
    EP3233323A1|2017-10-25|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50918/2014A|AT516260B1|2014-12-17|2014-12-17|Bending tool with a longitudinal offset measuring device|ATA50918/2014A| AT516260B1|2014-12-17|2014-12-17|Bending tool with a longitudinal offset measuring device|
    EP15828477.8A| EP3233323B1|2014-12-17|2015-12-14|Bending tool having a longitudinal-offset measuring device|
    PCT/AT2015/050316| WO2016094918A1|2014-12-17|2015-12-14|Bending tool having a longitudinal-offset measuring device|
    US15/535,814| US10464114B2|2014-12-17|2015-12-14|Bending tool having a longitudinal-offset measuring device|
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