• 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 an angle measuring device for a bending press (1) having a press table (2) with a bending die (3) and a pressing bar (4) which is movable relative to a travel direction (7) with a punch (5). 3) a sheet metal part (8) to be formed is arranged, which the punch (5) contacts during bend forming along a bending line (9) and wherein the bending line (9) and the travel direction (7) span a working plane (10) comprising a lighting device (12) with at least one light source (13), an optical image acquisition device (14) with an optical axis (20) and a data-technical image evaluation device (15), wherein the illumination device (12) has a portion (18) of a surface of the sheet metal part (8). illuminated on at least one side of the working plane (10), wherein the optical axis (20) in the working plane (10) is arranged, and the optical axis (20) and the bending line (9) in the illuminated Absch The optical axis (20) and a normal projection track (33) of the optical axis (20) on the surface of the sheet metal part (8) in the illuminated portion (18) include an angle (21) less than 2 °.
    公开号:AT511557A1
    申请号:T699/2011
    申请日:2011-05-17
    公开日:2012-12-15
    发明作者:
    申请人:Trumpf Maschinen Austria Gmbh；
    IPC主号:
    专利说明:

    - 1 - • ·
    The invention relates to an angle measuring device for a bending press. For the production of dimensionally accurate bending parts compliance with the design required bending angle is of particular importance, so determined during or after the bending process of the trained angle, compared with the desired target angle and optionally another bending process must be performed. However, this requires additional process steps, as to measure the angle, the press must be opened so far that the bent part is relieved and that access to the bent angle with angle measuring devices is possible. In particular, such a measurement is always associated with a delay in the workflow.
    To reduce the effort in the examination of the angle is known from the prior art to integrate the measurement of the angle in the bending process, so that without the intervention of an operator of the bent angle can be determined. In this regard, for example, DE 10 2008 038 932 A1 discloses a pivoting bending machine, in which a light sensor is arranged in the bending tool, which at a relief of the bending part, ie upon pivoting back of the bending beam, that time and thus those angles detected in the light in the gap between bent workpiece and bending cheek falls. By knowing the swing angle of the bending beam can be thus on the bent angle! draw conclusions.
    A further embodiment is known from DE 43 12 565 C2, in which a light source directs a light trail on the cheeks of the bent workpiece, which light track is picked up by a camera arranged on the press beam and this recorded image is analyzed by an evaluation device in order to obtain it to calculate the bending angle. The light source is arranged integrated in the bending punch or in the counter tool, so that even when moving the tool, a light trail can be formed on the sheet metal leg. Since the image pickup N2010 / 34800 -2- ♦ # · · * ·
    te! must be able to detect the light trail on the sheet metal cheeks, this must be aligned at an appropriate angle to the illuminated by the light tracks portion of the bending part. When the sheet metal part is pressed into the counter tool, the bending punch will at least partly cover the working area, so that detection by the camera is no longer possible.
    From JP 2-280920 A an angle measuring device is known in which an image capture device detects the end face of a bent sheet metal part and determines the bending angle via an image evaluation device. To ensure a high resolution quality, it is disclosed that the distance between the image capture device and the front side of the work piece is determined and the focusing device of the image pickup device is adjusted according to this distance.
    When bending longer parts is due to the forces always the risk that, for example, the machine bed or the press bar deform slightly, so that the bending angle in the middle of the bent part can be different compared to the edge sections. For the formation of a correct bending angle, a detection of the end faces of the bent part is therefore not expedient, as this only a local snapshot can be formed. However, the training known from the prior art, according to which an optical detection device is integrated in the bending tool, has the disadvantage that very expensive and therefore very expensive tools have to be produced for this purpose, and furthermore that the arrangement of the detection device tm tool structurally weakens it. so that there is an additional risk of a bend in the feet. It is also necessary to determine the position of the angle measurement along the bending line before carrying out the bending, since the detection device must be arranged in the desired section. Such a configuration thus requires a considerable amount of manipulation and thus a delay in the bending process.
    The formation of a detection device as a camera, which is directed at an angle to an illuminated portion of the sheet metal part, has the disadvantage that a lowering and the bending performing punch limits the field of view of the camera on the workpiece and thus the essential for the detection of the bending angle section is covered by the punch. Further, since the detection of a light trace on the bending part and the subsequent determination of the angle requires a certain Minimaiwinkel under which the camera must be directed to the workpiece N2010 / 34800, there is a risk that only a portion of the bent part, especially for long bending parts can be evaluated with such an angle measuring device.
    The devices known from the prior art now have the particular disadvantage that the determination of the bending angle either requires very complex bending tools, or that the angle determination is essentially possible only for the edge sections of the bent part.
    The object of the invention is therefore to provide an angle measuring device in which contactless and along the bending line of the bending angle can be determined without the need for complex or complex bending tools are required. In particular, the angle measuring device according to the invention should be easy to retrofit for existing bending presses.
    The object of the invention is achieved by an angle measuring device in which a lighting device with at least one light source illuminates a portion of the surface of the sheet metal part on at least one side of the working plane, wherein the working plane by the direction of travel of the press beam and by the bending line, as a contact line between the press beam and the sheet metal part, is clamped. According to the invention, the optical axis of an optical image acquisition device is arranged in the working plane, and furthermore the optical axis and the bending line in the illuminated section enclose an angle of less than 2 °.
    By this angle, which corresponds to an almost parallel arrangement of the optical axis and the bending line, it is ensured that along the bending line each illuminated section can be picked up by the image capturing device without completely covering the detection area by the bending and bending forming bending stamping. When illuminating a portion of the sheet metal part by a light source, the individual rays of the incident on the sheet metal part beam, diffused due to the given surface roughness of the sheet metal part. For the angle measuring device according to the invention, however, only those reflected beams are relevant or are picked up by the image capturing device, which leave the illuminated section with respect to the bending line at a very small angle, ie virtually parallel to the bending line, and thus reach the detection area of the image capturing device. In this way, it is further ensured, in particular, that no direct components of the radiation leaving the illuminant are emitted. N2010 / 34800 ψψ * · «« «« «I I I I · · · ·
    »·» »· *« ·
    * * · · · · * * * * * I * I * * * * * »bundles from the image capture device. By positioning the illumination device along the bending line, it is possible with the winching measuring device according to the invention to determine the bending angle at each point, without having to limit the angle determination by the components involved in the bending process.
    In addition to the above-described solution for the described bending press, the object of the invention is also achieved in that the optical axis and a normal projection track of the optical axis on the surface of the sheet metal part in the illuminated section at an angle less than 2 °. In this embodiment, an optical image capture device is disposed laterally of the press beam so that the angle between the optical axis and the bend line has a component parallel to the work plane and a component normal to the work plane. With the development, it is ensured that, according to the invention, the image capture device only detects those radiation components which leave the illuminated section substantially parallel to the sheet metal surface. The image capture device is arranged such that at least when reaching the desired bending angle, the claimed angle forms. During the bending process, this angle will decrease steadily from an initial angle. With this design, half the bending angle is determined, so that, assuming a symmetrical course of the bend, the total bending angle results from the twice the determined angle according to this embodiment,
    According to the invention, the lighting device is formed by at least one luminous means which can be arranged, for example, centrally on the press beam and thus illuminates sections on both sides of the working plane. According to a development, the illumination device can have at least two illumination means, which illumination means are arranged on both sides of the working plane, in particular on the compression beam. This training has the particular advantage that the two bulbs, for example, very easily arranged directly on the press bar and can be aligned with the section to be illuminated and thus always maintained their position correctly aligned when driving down the press ram. For example, the Leuchtmittef have a magnetically acting holding device and are thus very easy to attach to the metallic press bar. This has an advantage, in particular for service or configuration tasks, and further enables a very simple definition of the position along the bending line at which the angle measurement is to take place. N2010 / 34800
    After it is of particular interest for long bending parts to detect the bending angle even in the middle regions of the bending line, a further development is advantageous according to which the luminous means is displaceably arranged in the direction along the bending line. For example, a longitudinal guide can be arranged on the press beam or on the machine frame, on which the lighting means is arranged or in which guide rail a guide of the lighting means engages. In the course of setting up the machine or during bending monitoring, the light source can now be moved to the position at which the bending angle is to be detected. The advantage of this development is further that the alignment of the light source is reliably maintained on the section to be illuminated, regardless of the arrangement position. Also, this training allows a very quick and easy adjustment of the measuring position, without the need for complex conversion work on the bending press are required.
    To simplify the measurement and in particular with regard to an automation of the measurement, a development is advantageous according to which the illumination device has a selectively controllable drive means, which is in operative connection with the light source. For example, the drive means may be formed by a linear motor, which is selectively controlled by a control module, which is preferably arranged in the image evaluation device, in order to move the light source to the desired position along the bending line. It is also possible that the drive means is formed for example by a circulating cable system, wherein the lighting means is guided in a longitudinal guide and is moved by a positioning motor by means of the cable to the desired position.
    In order to simplify the angle measurement and to increase the throughput or in terms of the best possible automation is also a development of advantage, according to which a plurality of lamps are arranged in the direction along the bending line. Preferably, the lighting means are selectively controlled by a control module of the image evaluation device in order to illuminate one sheet metal section on each side of the traverse plane. According to a further development, it may be provided that the lighting means are each cyclically activated so as to be able to continuously determine the currently bent angle at a plurality of positions along the bending line during the bending process.
    Since the use of the angle measuring device can lead to severe vibrations again and again, a further development is advantageous, according to which the N2010 / 34800 -6- * · · · · · · # «« «« «« «« · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · N N N N N N N N N N N N N N N N N N N N N N N N N N »♦ ·» · * «* a
    Illuminant is formed by a semiconductor device. Such semiconductor devices are very advantageous in terms of their mechanical resistance, since they can survive due to their structural structure large vibration without damage. In contrast to thermal radiators, it is also advantageous that such semiconductor components have less self-heating and thus make lower safety requirements necessary in the environment of combustible lubricants or hydraulic oils. Another advantage is the significantly higher optical efficiency and the lower energy consumption, while maintaining a high luminance.
    According to a development, the luminous means has a club-shaped radiation characteristic, which has the advantage that the predominant luminous flux emitted by the luminous means is directed in a radiation lobe onto the section to be illuminated, and thus a high luminance is achieved there, which diffuses for the direction in the direction of the image capturing device reflected radiation components is advantageous, since thus the detected light intensity will be higher. The illuminant can, for example, have a reflector with focusing optics, in order to emit the radiation in a club shape. It is further ensured by the lobe characteristic that no direct beam components of the luminous means reach the detection device. By way of example, a light emitting diode may be used as the light source, which in a possible embodiment has an opening angle of the radiation characteristic between 45 ° and 65 °.
    According to a development, the illuminant has a directional radiation characteristic with an aperture angle of less than 10 °, which has the advantage that by means of a directional radiation characteristic, as given for example by a laser, the section to be illuminated on the bent part will have a high luminance because with a directional radiation characteristic, the entire luminous flux emitted by the luminous means is directed onto the section to be illuminated.
    In order to increase the luminance in the section to be illuminated or to suppress scattered light, which may optionally pass directly from the light source to the image capture device, a development is advantageous, according to which the illumination device has a beam shaping device, in particular a luminous pattern in the illuminated section to create. The light pattern may, for example, be a strip having a preferred width which is normal or at an angle to the bend line, illuminating the sheet metal part. Also, a line pattern can be applied to N2010 / 34800 to illuminate discrete sections on the sheet metal part. The beam shaping device can be formed, for example, by a diaphragm or lens system, but prism systems or scanning deflection systems are also possible.
    Another advantage is also a development according to which the lighting device is arranged integrated in the press bar or in the stamp. By this design, a very close arrangement of the lighting device is achieved at the bending line, which has the advantage that an unwanted incidence of light from the lighting device directly on the image capture device can be largely suppressed and even in a deep immersion of the punch in the bending tool, a good illumination of the sheet metal part is given in the bending line.
    Since it is provided according to the invention to detect the bending angle along the bending line and therefore the image acquisition device must be well adapted to the respective section to be detected, a further development is advantageous, according to which the image acquisition device has a focusable and / or in the focal length selectively adjustable optics. By adjusting the focal length of the optics, the focal point can be placed exactly on the portion to be detected, so that for each section to be detected along the bending line a customized detection optics is given, in particular by adjusting the focal length optics of the image opening angle of the optics is adapted to the detection area be. Due to the selective focusing, the focal point in the detection area can be chosen such that the highest possible light intensity is detected. Optionally, the focal point can be slightly varied, wherein an averaging is carried out by the image evaluation device, so as to detect a possible limited and simultaneously high intensity of the detected reflection. The more clearly the detected reflected radiation is confined to a narrow portion of the detection area, the more precisely a line can be formed therefrom.
    With regard to automation, a development is advantageous according to which the selective adjustable optics is connected to a setting means of the image evaluation device, since thus an automated and therefore not to be made by the operator setting the optics of the image capture device is possible. This setting is preferably carried out by a control module of the image evaluation device.
    Since, according to the invention, the optical axis of the image capture device and the bend line enclose an angle in the illuminated section, this angle is very small, so that approximately a quasi-parallel alignment of the optical axis and the N20KV34800 -8- · · · · · · · · · · · · · · · · · · · · * · • > • · • ·
    Given bending line is a development of advantage, according to which the image capture device is pivotally mounted, in particular by an adjusting means is designed to pivot. Since, in accordance with the invention, only the scattered light of the illuminated section is detected, which scattered light leaves the illuminated section quasi parallel to the sheet surface in the direction of the image capture device, illuminated sections, which are far away from the image capture device along the bend line, have very small angular dimensions, so that it is advantageous if in this case the viewing angle of the image capture device can be changed to the illuminated portion, in particular can be increased. For example, the image capture device may be changed in position along the trajectory by selecting a greater distance between the optical axis and the bendline. In addition, the optical axis can be tilted toward the bending line, so that the viewing angle is improved for far-away, illuminated sections - that is, the angle between the optical axis and the bending line is changed. Since the optical axis of the image capture device is located in the traverse plane, this adjustment range will have to be very small so as not to cover the illuminated portion by the descending stamp.
    A further possibility for preventing a direct incidence of light from the light source onto the image capturing device is characterized in that a polarization element is arranged in each case in the beam path of the illuminant and in the optics of the image capturing device, wherein the polarization planes of the two polarization elements enclose an angle greater than 0 °. However, this angle will preferably be a right angle or an approximately right angle, so that reliably those radiation components emanating directly from the light source can not pass the polarization element of the image capture device. With this development, although a part of the light diffusely reflected in the illuminated section is lost for the evaluation, by simplifying the evaluation, since no unwanted scattered light is to be expected, the evaluation reliability can be increased.
    A development consists in that an optical image capture device is arranged on both sides of the work plane. Thus, both bending legs can be detected simultaneously and thus the entire bending angle can be determined.
    Since, according to an embodiment of the invention, the arrangement of the image acquisition device must be adapted to the bending angle to be achieved, in particular the N2010 / 34800
    To arrange image sensing device such that adjusts the angle according to the invention between the optical axis and the normal projection track upon reaching the desired bending angle is provided according to a development that the image capture device is disposed on a positioning device, which positioning at least in the direction parallel to the working plane adjustable is. Thus, the image acquisition device can be moved to the corresponding position before the bending process, for example. By moving along a longitudinal guide, which can be arranged on the machine frame. For an automated production, in particular for the simplification of the adjustment, a development is advantageous, according to which the positioning device is connected to a machine control, since thus a direct and in particular automated setting possibility is given. For example, the positioning device may have a longitudinal guide, in which the image acquisition device is arranged displaceably, wherein the displacement movement is accomplished by a, driven by the machine control drive means.
    For a better understanding of the invention, this will be explained in more detail with reference to the following figures.
    Each shows in a highly schematically simplified representation:
    1 is an illustration of a bending press with the angle measuring device according to the invention:
    FIG. 2 is a schematic diagram of the determination of the bending angle; FIG.
    Fig. 3 a) to c) another possible embodiment of the angle measuring device according to the invention.
    1 shows an angle measuring device according to the invention on a bending press 1, the bending press 1 having a press table 2 with a bending die 3 and a press bar 4 movable relative thereto with a punch 5. The press bar 4 is moved by drive means 6 in a direction of travel 7 on the bending die 3, wherein the punch 5, in particular the working edge of the punch, a reshaped sheet metal part 8 contacted along the bending line 9. The bending line 9 and the travel direction 7 thereby tension the working plane 10. N2010 / 34800
    The angle measuring device according to the invention now has an illumination device 12 with a light source 13, an optical image capture device 14 and a data processing image evaluation device 15. Preferably, the three components are connected to one another in terms of data technology or communication, so that, for example, a control module of the image evaluation device 15 controls the activation of the light source 13 of the lighting device 12 and at the same time initiates image acquisition by the image capture device 14. A user interface 16, in particular an input / output device, is preferably connected to the image evaluation device 15 in order to present the result of the angle detection to the operator of the bending press 1, so that the latter can continue the bending process until the desired bending angle is reached. For automated bending, the image evaluation device can also be connected directly to the control of the bending press 1 or the image evaluation device 15 can be part of the control of the bending press 1, so that the required bending angle is produced automatically and in particular without operating action by the operator.
    According to the invention, the bulb 13 emits a beam collar 17 onto a section 18, on at least one side of the working plane 10, of the surface of the sheet-metal part 8 to be formed. The Leuchtmittei can be formed for example by a light emitting diode, which emits a beam 17 in the direction of the sheet metal part 8 due to their structural design or due to an existing beam-forming device. Since the optical axis 20 of the image capture device 14 is arranged in the working plane 10 and also approximately parallel to the bending line 9, only those rays of the beam 17 incident on the section 18 are detected by the detection region of the optical detection device 14, which due to the diffuse reflection in the section 18, be reflected substantially parallel to the sheet surface. According to the invention, the optical axis 20 and the bending line 9 in the illuminated section 18 form an angle 21 of less than 2 °. Due to this small angular extent, the indication of a quasi-parallel arrangement of the optical axis 20 and the bending line 9 is justified. In order to represent the angular relationships, the thickness of the sheet metal part 8, and the arrangement of the image capture device 14, in particular the distance 22 of the optical axis 20 of the bending line 9 and resulting from this arrangement angle 21 has been exaggerated. The inventive arrangement of the image capture device 14 now ensures that it is largely ensured that no direct light of the lighting device 12 enters the detection range of the image capture device 14 and that the image capture from the stationary 7 Press N2010 / 34800 - 11 - * * *. Bar 4 is not affected during the bending operation and that in particular the detection of the bending angle at each point along the bending line 9 is possible and not only, as known from the prior art, at the an imaging device facing end portion of a sheet metal part.
    According to an advantageous development, however, it is also provided that the lighting device 12 is designed such that a section on the sheet metal surface 8 is illuminated on both sides of the working plane 10. For this purpose, for example, be attached to both sides of the working plane, a light source, preferably they will be arranged on the press bar. With such a design, it is also possible to simultaneously determine the bending angle at two different positions along the bending line, in which two light sources are arranged at different positions or light sources arranged at different positions are activated,
    According to one embodiment, it is provided that the lighting device 12 is arranged displaceably in the longitudinal direction of the bending line. For this purpose, for example, a guide device 23, for example, a rack arranged in the press bar 4, in which a drive means 24 of the lighting device 12 engages, the drive means 24 is selectively controlled by a control module of the image evaluation device 15 to the lighting device to the desired position along the bending line move and thus also to move the illuminated section accordingly. With this development, it is possible at any time during the bending process to detect the currently formed bending angle at any section along the bending line, without requiring manual measurements are required, or without the sheet metal part 8 would have to be removed from the bending press 1 for measurement , In this regard, it is also advantageous if, according to a development, the image capture device 14 can be adjustably adjusted in its focal length, preferably in turn by a control module of the image evaluation device 15 so that the operator at any time during the bending process and without additional adjustment effort, several angle measurements at different positions along the Bend line 9 can perform.
    In order to adapt the angle 21 between the optical axis 20 and the bending line 9, it can be provided according to a development that the image capture device 14 is pivotally arranged, in particular that the distance 22 between the image capture device 14, in particular the optical axis 20, and the bending line. 9 as well as N2O1O / 34SO0 - 12- • »• · · · · · · · · · · · ·
    • die »I the pivoting of the image capture device in the traverse plane 10 is adjustable. For example, if an angle at the maximum removed portion of the sheet metal part to be detected, it will come to a very small angle 21 between the optical axis 20 and bending line due to the large distance, which will adversely affect the Auslesegenauigkeit. If, in this case, the image capture device 14 is removed somewhat further from the bend line, an angle 21 which is more favorable for the image capture is established, so that in turn more diffuse reflected light is detected.
    FIG. 2 shows an exemplary representation of the image captured by the image capture device on a display device 25 of a user interface. For reasons of representation, both the end face region 26 and the end region 27 distanced therefrom are depicted sharply illustrated. Due to the focal length adjustment and focusing of the image capture device, the focus range of the imaging optics will preferably be fixed to the illuminated portion 18, so that in particular the end regions 26, 27 are shown mostly out of focus. Because of the quasi-parallel arrangement of the optical axis and the bending line 9 according to the invention, only those beams of the diffuse reflection are detected by the illuminated section 18, which leave the illuminated section quasi-parallel to the sheet metal surface 28 in the direction of the detection range of the image acquisition device. In FIG. 2, these diffusely reflected radiation components are represented in a simplified manner by light points 29. Due to the ever-present surface roughness, the point of reflection will be statistically distributed over the illuminated section, so that no clearly rectilinear and sharply demarcated reflection is detected, but essentially a reflection band. The individual reflection points are then analyzed by an interpolation method and an interpolation straight line 30 is generated, for example, by averaging the reflection points on each cheek of the sheet metal part 8. The hints! between the two Interpolationsgeraden 30 is now the bending angle 31 at the position of the illuminated portion 18th
    Since according to a development, the lighting device is longitudinally displaceable or that a plurality of bulbs are arranged in the longitudinal direction, the currently formed bending angle 31 can now be determined during the bending process at several positions along the sheet metal part and thus by appropriate pressing of the punch or by a mechanical counter-control of the bending die or the press table and / or by different activation of the drive means of the N2010 / 34800 -13- -13- * * «· · · · · · · · · ·« · · · · · * 1 * 4 «• · · · Ι · ♦ · · «* * Μ Μ»
    Press beam corrected the trained bending angle and thus be made along the sheet metal part of the desired bending angle.
    3a to 3c show a further embodiment of the angle measuring device according to the invention, bet the optical axis of the image capture device is arranged substantially parallel to the working plane.
    FIG. 3 a shows a side view of the machine frame 11, wherein the viewing direction is arranged in the working plane 10. At the press bar 4, a lighting device 12 is arranged with a light source and outputs a beam 17 on the surface 32 of the sheet metal part 8, so that on the surface 32, a section is illuminated. This illuminated portion is detected by an image capture device 14, wherein the optical axis of the image capture device 14 is arranged substantially parallel to the working plane 10, as will be described in detail in the following figures.
    An advantage is an embodiment, according to which a lighting device 12 and an image capture device 14 are arranged on both sides of the working level 10, since thus both bending legs can be detected simultaneously and thus the entire bending angle 31 can be detected. It is also illustrated in FIG. 3 a that the image capture device 14 must be arranged such that upon reaching the desired bending angle 31, the image capture device 14 can detect the illuminated portion on the surface 32 of the sheet metal part 8, that is, the optical axis above the Sheet surface must be located. This alignment will be described in more detail in the following figures.
    3b shows a view of the sheet metal part 8, wherein the viewing plane lies in the surface 32 of the sheet metal part 8.
    In an embodiment with two lighting devices on both sides of the working plane, a portion 18 on the surface 32 on both legs of the sheet metal part 8 is illuminated in each case. Due to the selected view in Fig. 3b, the bending line 9 coincides with the normal projection track 33, wherein according to the invention the angle 21 between the optical axis 20 of the Biidfassungsvorrichtung 14 and the normal projection track 33, the optical axis 20 on the surface 32 of the sheet metal part , is less than 2 °. To illustrate the conditions, this angle is shown clearly exaggerated in the figure. N2010 / 34800 - 14- ·
    Upon reaching the Biegeumfornnung the detection range of the image capture device 14 must be directed to the illuminated portion 18 of the sheet surface 32 of the sheet metal part, in particular to form the inventive angle between the optical axis 20 and the normal projection track 33. For this purpose, the image capture device 14 is preferably arranged on a positioning device 34, which positioning device is preferably arranged on the machine frame 11. The positioning device 34 will in turn have a drive means which is connected to the machine control, for example, so that the drive means of the positioning device are correspondingly activated by the latter before the bending deformation is carried out, and the image capture device is moved to the corresponding position. This is in particular possible in an automated manner, since the bending angle to be formed is already known at this time due to a background programming or stored work instruction and thus the adjustment work for the positioning of the image acquisition device is removed from the operator.
    3 c shows a view parallel to the bending line 9 on the image-capturing device 14. In FIG. 3 c, two possibilities are illustrated how the image-capturing device 14 can be arranged in a positioning device 34, wherein the arrangement in the positioning device is not absolutely necessary, since the Image capture device may optionally be arranged directly on the machine frame.
    In one possible embodiment, the image capture device 14 is arranged parallel to the working plane displaceable in the positioning device, and is moved by means of a drive means 35 in the positioning device, so that the exit point of the optical axis 20 is moved parallel to the working plane 9.
    When bending very small bending angles 31, with an arrangement of the image capture device 14 according to the embodiment shown on the right in the figure, a reduction of the detectable, illuminated portion can occur since, in particular, the image capture device usually has a rectangular image capture region. Therefore, a design as shown on the left in FIG. 3c is advantageous, as it allows a very large area of the illuminated sheet metal surface to be detected even for very small bending angles. Again, in turn, the image capture device 14 is slidably received in a positioning device 34 and is preferably moved by a drive means 35 along the direction of movement, so as to be able to adjust the position at the bending angle N2010 / 34800 31. Preferably, the displacement direction will be aligned substantially normal to the sheet surface.
    In order to exploit the greatest possible utilization of the detection width of the image capture device 14, a further development is advantageous, according to which the image capture device 14, as shown for example in FIG. 3c on the right, is additionally pivotable about an axis through the exit point of the optical axis 20 is. Thus, the image capture device can be pivoted in the movement parallel to the working plane 9 about the axis of rotation, so that always the largest possible detection width is arranged aligned substantially parallel to the sheet surface.
    In a further development, it is also possible to successively track the image acquisition device with the progress of the bending deformation of the moving sheet metal leg, so as to be able to detect a direct and immediate course of the bending deformation.
    Finally, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals and the same component names, the disclosures contained throughout the description can be mutatis mutandis to the same parts with the same reference numerals or identical component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are mutatis mutandis to transfer to the new location in a position change, Furthermore, individual features or combinations of features from the illustrated and described different embodiments may represent for themselves, inventive or inventive solutions , All statements on ranges of values in the description of the present invention should be understood to include any and all sub-ranges thereof, e.g. the indication 1 to 10 should be understood to include all sub-ranges, starting from the lower limit 1 and the upper limit 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.
    The exemplary embodiments show possible embodiments of the angle measuring device, wherein it should be noted at this point that the invention is not limited to the specifically illustrated embodiments of the same, but rather also various N2010 / 34800 -16- · ♦ # · »« * · ·· # · • * > • · «·« »» • · · r
    Combinations of the individual variants with each other are possible and this possibility of variation due to the doctrine of technical action by objective invention in the skill of those working in this technical field is the expert.
    So are all conceivable embodiments, which are possible by combinations of individual details of the illustrated and described embodiment variant, includes the scope of protection.
    FIG. 3 shows a further embodiment of the angle measuring device, which may be independent of itself, wherein the same reference numerals or component designations are used again for the same parts as in the preceding figures. To avoid unnecessary repetition, reference is made to the detailed description in the preceding figures.
    Above all, the individual embodiments shown in FIGS. 1 to 3 can form the subject of independent solutions according to the invention. The relevant 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, for a better understanding of the structure of the angle measuring device, these or their components have been shown partially unevenly and / or enlarged and / or reduced in size.
    The task underlying the independent inventive solutions can be taken from the description. N2010 / 34800 ♦ · · · · · · *
    Reference designation 1 Bending press 2 Press table 3 Bending die 4 Presser bar 5 Punch 6 Drive means 7 Travel direction 8 Sheet metal part 9 Bend line 10 Work plane 11 Machine frame 12 Illumination device 13 Illuminant 14 Optical image acquisition device 15 Data processing image evaluation device 16 User interface 17 Beam 18 Illuminated section 19 Opening angle 20 Optical axis 21 Angle 22 Distance 23 Guide device 24 Drive means 25 Display device 26 End face 27 End region 28 Sheet surface 29 Light point 30 Interpolation line 31 Bending thread! 32 Surface 33 Normal projection track 34 Positioning device 35 Drive means N2010 / 34800
    权利要求:
    Claims (18)
    [1]
    1 angle measuring device for a bending press (1) with a press table (2) with a bending die (3) and, in a direction of travel (7) relative to movable pressing bar (4) with a punch (5), wherein the Press beam (4) and the bending die (3) are arranged in a frame (11) and wherein in the bending die (3) a sheet metal part (8) to be formed is arranged, which contacts the punch (5) during the bending deformation along a bending line (9) and wherein the bending line (9) and the travel direction (7) span a working plane (10), comprising a lighting device (12) with at least one light source (13), an optical image capture device (14) with an optical axis (20) and a data technology Image evaluation device (15), wherein the illumination device (12) illuminates a section (18) of a surface of the sheet metal part (8) on at least one side of the working plane (10), characterized in that the optical axis (20) is arranged in the working plane (10), and the optical axis (20) and the bending line (9) in the illuminated portion (18) include an angle (21) less than 2 °.
    [2]
    2. An angle measuring device for a bending press (1) with a press table (2) with a bending die (3) and a pressing bar (4) which is movable relative to it in a travel direction (7) with a punch (5), wherein the pressing bar (5) 4) and the bending die (3) are arranged in a frame (11) and wherein in the bending die (3) a sheet metal (8) to be formed is arranged, which the punch (5) contacts during bending deformation along a bending line (9) the bending line (9) and the travel direction (7) span a working plane (10), comprising a lighting device (12) with at least one light source (13), an optical image capture device (14) with an optical axis (20) and a data-technical image evaluation device ( 15), wherein the lighting device (12) illuminates a portion (18) of a surface of the sheet metal part (8) on at least one side of the working plane (10), characterized in that the optical axis (20) and a normal project ion track (33) of the optical axis (20) on the surface of the sheet metal part (8) in the illuminated portion (18) include an angle (21) less than 2 °. N2010 / 34800 -2- • ·
    [3]
    3. Angle measuring device according to claim 1 or 2, characterized in that the lighting device (12) has at least two lighting means (13), which lighting means (13) on both sides of the working plane (10) are arranged, in particular on the press bar (4).
    [4]
    4. Angle measuring device according to one of claims 1 to 3, characterized in that the lighting means (13) is arranged displaceably in the direction along the bending line (9).
    [5]
    5. Angle measuring device according to claim 4, characterized in that the lighting device (12) has a selectively controllable drive means which is in operative connection with the lighting means (13).
    [6]
    6. angle measuring device according to one of claims 1 to 5, characterized in that a plurality of lighting means (13) in the direction along the bending line (9) are arranged.
    [7]
    7. Angle measuring device according to one of claims 1 to 6, characterized in that the lighting means (13) is formed by a semiconductor device.
    [8]
    8. Angle measuring device according to one of claims 1 to 7, characterized in that the lighting means (13) has a club-shaped radiation characteristic.
    [9]
    9. angle measuring device according to one of claims 1 to 8, characterized in that the lighting means (13) has a directional radiation characteristic.
    [10]
    10. An angle measuring device according to any one of claims 1 to 9, characterized in that the illumination device (12) comprises a beam-forming device, in particular to produce a light pattern in the illuminated portion (18).
    [11]
    11. Angle measuring device according to one of claims 1 to 10, characterized in that the lighting device (12) in the press bar (4) or in the punch (5) is arranged integrated. N2010 / 34800 -3-
    [12]
    12. Angle measuring device according to one of claims 1 to 11, characterized in that the Biiderfassungsvorrichtung (14) has a focusable and / or in the focal length selectively adjustable optics.
    [13]
    13. Angle measuring device according to claim 12, characterized in that the selective adjustable optics is connected to an adjusting means of the image evaluation device (15).
    [14]
    14, angle measuring device according to one of claims 1 to 13, characterized in that the image sensing device (14) is pivotally mounted, in particular by an adjusting means is formed pivotable.
    [15]
    15. Angle measuring device according to one of claims 1 to 14, characterized in that in the beam path of the light-emitting means (12) and in the optics of the image sensing device (14) each have a polarizing element is arranged, wherein the polarization planes of the two polarizing elements enclose an angle greater than 0 °.
    [16]
    16, angle measuring device according to one of claims 2 to 15, characterized in that on both sides of the working plane (10) an optical image sensing device (14) is arranged.
    [17]
    17. Angle measuring device according to one of claims 2 to 16, characterized in that the image capture device (14) is arranged on a positioning device (34), which positioning device (34) is adjustable at least in the direction parallel to the working plane (10).
    [18]
    18. Angle measuring device according to claim 17, characterized in that the positioning device (34) is connected to a machine control. TRUMPF Maschinen Austria GmbH & Co. KG. by lawyer ^ Urgen & Partner Attorney at Law N2010 / 34800
    类似技术:
    公开号 | 公开日 | 专利标题
    EP2709779B1|2021-06-23|Angle measuring device for a press brake
    AT503559B1|2007-11-15|DEVICE FOR EVALUATING PICTURES OF WELDING POINTS ON A CARRIER MATERIAL
    DE102007015275A1|2008-05-15|Shadow moire using device for measuring a three-dimensional shape
    DE3216053A1|1983-11-03|OPTOELECTRONIC MEASURING METHOD AND DEVICE FOR CARRYING OUT THE METHOD
    EP1639312A2|2006-03-29|Device and method for measuring the dimensions of a body
    EP3233323B1|2019-12-11|Bending tool having a longitudinal-offset measuring device
    EP3207333B1|2020-01-29|Bending angle measuring method
    DE60222194T2|2008-06-05|Production method of a spark plug and manufacturing apparatus of this method
    EP2147729B1|2011-03-09|Reshaping device
    EP2995391B1|2018-08-08|Calibration method for a bending machine and such a bending machine
    EP3158288B1|2018-04-04|Bending angle measuring device for a bending press
    EP3041617B1|2017-06-14|Bending tool assembly for determining the bending angle
    AT516044B1|2016-02-15|Bending angle measuring device
    AT514188B1|2015-02-15|Bending angle measuring device for a bending press
    AT522419B1|2021-11-15|Measuring device for determining the bending angle
    AT518993B1|2018-03-15|Method for operating a bending machine
    AT516465B1|2016-08-15|Bending tool with bending geometry measuring device
    WO2019063269A1|2019-04-04|Illumination unit for a slit lamp of the tower type
    同族专利:
    公开号 | 公开日
    AT511557B1|2013-08-15|
    EP2709779A1|2014-03-26|
    EP2709779B1|2021-06-23|
    WO2012155168A1|2012-11-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4772801A|1985-10-30|1988-09-20|Cybelec S.A.|Optical light beam device for automatically controlling the bending operation when bending with a press brake|
    JPH0352717A|1989-07-20|1991-03-06|Amada Co Ltd|Bending device|
    DE29713318U1|1997-07-26|1997-09-25|Weinbrenner Paul Maschbau|Angle measuring device for bending machines|
    WO2006135961A1|2005-06-20|2006-12-28|Lazer Safe Pty Ltd|Imaging and safety system and method for an industrial machine|
    EP1914019A1|2006-10-18|2008-04-23|Warcom S.p.A.|Press brake and related workpiece bending procedure|
    EP2147729A1|2008-07-25|2010-01-27|Fiessler Elektronik GmbH & Co. KG|Reshaping device|WO2014165885A1|2013-04-09|2014-10-16|Trumpf Maschinen Austria Gmbh & Co. Kg.|Bending-angle measuring device for a bending press|
    WO2018039695A1|2016-09-02|2018-03-08|Trumpf Maschinen Austria Gmbh & Co. Kg.|Bending machine comprising a work area image detecting device and method for representing a work area|
    US11185903B2|2016-09-02|2021-11-30|Trumpf Maschinen Austria Gmbh & Co. Kg|Bending machine having a working area image capturing apparatus and method for improving the operational safety of a bending machine|JPS5918408A|1982-07-23|1984-01-30|Mitsubishi Heavy Ind Ltd|Slant degree detecting device for slant member|
    JPH02280920A|1989-04-20|1990-11-16|Amada Co Ltd|Device for correcting bending angle of bending machine|
    EP0470263B1|1990-02-23|1997-05-07|Amada Company Limited|Method and apparatus for measuring the angle of work|
    DE4312565C2|1993-04-17|2001-12-13|Trumpf Maschinen Austria Gmbh|Bending machine for bending flat workpieces|
    DE102008038932A1|2008-08-13|2010-02-18|Klingel, Hans, Dr. Ing. e.h.|Bending machine for bent forming of e.g. steel metal sheet, has optical gap sensor generating characteristic signal after bending step and utilized for amount-based detection of deviation of bending angle actual value from target value|FR3019070B1|2014-03-25|2016-04-01|Pinette Emidecau Ind Pei|METHOD AND DEVICE FOR FOLDING SHEETS|
    AT516260B1|2014-12-17|2016-04-15|Trumpf Maschinen Austria Gmbh|Bending tool with a longitudinal offset measuring device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA699/2011A|AT511557B1|2011-05-17|2011-05-17|ANGLE MEASURING DEVICE FOR A BENDING PEG|ATA699/2011A| AT511557B1|2011-05-17|2011-05-17|ANGLE MEASURING DEVICE FOR A BENDING PEG|
    PCT/AT2012/050070| WO2012155168A1|2011-05-17|2012-05-15|Angle measuring device for a press brake|
    EP12741240.1A| EP2709779B1|2011-05-17|2012-05-15|Angle measuring device for a press brake|
    [返回顶部]