Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
  • B21D5/004—Bending sheet metal along straight lines, e.g. to form simple curves with program control
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
  • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
  • B30B15/285—Arrangements for preventing distortion of, or damage to, presses or parts thereof preventing a full press stroke if there is an obstruction in the working area
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
  • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
  • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
  • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
  • F16P3/144—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using light grids

Definitions

• the invention relates to a method for operating a bending press, in particular a press brake, the bending press comprising a first platform with a first tool holder and a second platform with a second tool holder, one of the platforms being movable relative to the other platform for carrying out a working movement, a safety device for generating a light barrier running between the tool holders transversely to the working movement of the movable platform, in particular a laser light barrier which forms a light field in cross section, the safety device having a first holder which carries a light transmitter for generating the light barrier and a second holder, which carries a light receiver for receiving the light of the light barrier, and wherein the first holder is arranged on a first side of the first platform and can be adjusted relative to the first platform in this way by a first adjustment drive, that the position of the light barrier can be changed relative to the first tool holder in the direction of the working movement of the movable platform, a control device that is connected to the first adjustment drive.
• the invention also
• Safety devices in the form of light barriers each have brackets for a light transmitter or a light receiver on the side of the press beam The brackets are adjustable, which enables automatic and flexible positioning of the light barrier, depending on the bending tool used. For this purpose, it is known from the prior art that an operator enters the tool height via a user interface of the bending press and that the target position for the light barrier is automatically calculated from the tool height.
• the object of the present invention was to overcome the disadvantages of the prior art and to provide a method for operating a bending press with which the setting of the light barrier can be further improved.
• it should be ensured that the light barrier - regardless of or with each bending tool used - assumes the optimal position and can therefore reliably perform the safety function.
• it should also be excluded that incorrect positioning (e.g. by entering incorrect tool data) takes place and leads to dangerous situations.
• control device prior to a bending process or a sequence of bending processes, brings the first holder into a working position by actuating the first adjustment drive, in which the tool tip of a bending tool held by the first tool holder light field formed by the light barrier, preferably in a pre-given first area of the light field.
• the tool tip which is decisive for the position of the light barrier, can be used as a reference point.
• the adjustment of the first bracket and thus the setting of the light receiver (and thus the positioning of the light barrier) is in each case related to the tool tip of a bending tool equipped for the subsequent bending process.
• the tool tip can be recognized as such by the light receiver or the control device and distinguished from other shadows (fingers, foreign bodies, etc.). It is preferred if the first holder is adjusted with the light transmitter in such a way that the tool tip comes to lie in a predetermined first area within the light field.
• This first area is smaller than the light field and corresponds to an optimal loading area.
• the first area or its coordinates (within the light field or within the sensor surface of the light receiver) is stored in the light receiver and / or in the control device and is related in terms of data technology to the position of the detected tool tip. In this way it can be determined whether the tool tip is actually in the predetermined first range.
• a bending process is only started by the control device when the setting process of the light barrier has ended and its position meets the criteria according to the invention.
• tool tip is to be understood broadly and in the present application includes not only a point-like tip, but also rounded tool ends, or - in particular in the case of press brakes - also the elongated edge of a bending tool, which has a cross-section like a tip or rounded “Tool tip” can also mean the end of a stamp-shaped bending tool acting on the workpiece, or generally describe the area of the bending tool that first comes into contact with the workpiece during the bending process or - in other words - The end of the molding section of the bending tool facing the workpiece.
• the light field corresponds to the cross section of the light barrier.
• the light barrier is formed from at least one light beam that is expanded to form a light field, and / or comprises several light beams that preferably run in parallel. In the former case, a lens can be used to expand a single light beam. A homogeneous light field is preferred (transverse to the direction of expansion of the light barrier).
• the term “light barrier” is thus understood to mean any type of light beam (s) or light field (em) - from one or more individual light beams / fields. The principle is used that a partial or complete interruption (by foreign objects or a hand or a finger of an operator, etc.) of the light barrier detects a darkening or a shadow by the light enables receiver. Likewise, the light field enables the detection or detection of the shadow that is thrown from the tool tip (protruding into the light field) onto the light receiver.
• the light barrier extends essentially parallel to the first tool holder, which is preferably designed in the form of a guide rail, or — in the case of press brakes — essentially parallel to the bending line.
• a preferred embodiment is characterized in that the light receiver is an image receiver, preferably a camera.
• the light receiver can preferably be a flat sensor, the light-sensitive surface of which is e.g. corresponds at least to the cross section of the light barrier, that is to say the surface of the light field.
• the light receiver could also be attached to the first platform in a stationary or non-adjustable manner and e.g. be set up by appropriate size (flat image sensor) to detect the light barrier in its various positions relative to the first platform.
• the safety device is designed such that the position of the light barrier, which is determined by the position of the light transmitter, can be adjusted relative to the first tool holder or to the tool held therein.
• a (full or partial) Interruption of the light barrier creates a shadow, which is detected by the light receiver.
• the control device connected to the light receiver stops or slows down the working movement of the bending press depending on a detected shadow.
• the setting of the light barrier into the working position is carried out by moving the holding devices) transversely to the longitudinal extent of the tool holder, preferably parallel to the direction of the working movement of the movable platform, the direction of the working movement of the movable platform preferably being vertical.
• the adjustment drive (s) can in particular be used as a linear drive, e.g. a rack with Rit zel comprehensive, be trained.
• a preferred embodiment is characterized in that the control device brings the first holder into the working position depending on the shadow of the tool tip detected by the light receiver.
• the light barrier can always be aligned or positioned in relation to the tool currently being used. This is particularly advantageous for fine adjustment.
• the setting is carried out independently of influences such as temperature expansion of the tool, tool wear or tool tolerances, which means that the light barrier is always positioned in an optimal, high-security manner.
• a preferred embodiment is characterized in that in the working position of the first holder, the distance between the tool tip and the edge of the light field opposite the tool tip is at least one third, preferably at least half, of the expansion of the light field in the direction in which the working movement of the movable platform takes place, is.
• obstacles can now be recognized by the light receiver or the control device and the work movement or the bending process can be stopped as a result.
• the area of the light field is preferably at least 10 cm 2 , particularly preferably at least 20 cm 2 .
• the light field can be continuously illuminated, for example, be formed by an expanded beam, or by an array of discrete light beams.
• a preferred embodiment is characterized in that the position of the tool tip within the light field or the position of the light barrier (relative to the first tool holder or to a tool held by the latter) is determined on the basis of the shadow of the tool tip detected by the light receiver.
• the position determination not only enables reliable detection of whether the tool tip is in a predetermined target area or not, but also enables readjustment or line adjustment of the light barrier by adjusting the light transmitter.
• a preferred embodiment is characterized in that, depending on the determined position of the tool tip within the light field or the determined position of the light barrier, the first holder is adjusted until the tool tip is in a desired position or a desired area within the light field, preferably in a predetermined first area.
• a preferred embodiment is characterized in that the first holder is adjusted as a function of the determined position of the tool tip within the light field or the determined position of the light barrier if the tool tip is outside the given first area and within a predetermined second area within the light field lies, wherein the predetermined first area lies within the predetermined two-th area, and that the adjustment of the first holder takes place until the tool tip comes to lie in the predetermined first area.
• This criterion opens up the possibility of performing an adjustment process only when the tool tip is in a predetermined second range. After setting up the tool, the holder is adjusted according to the dimensions of the tool. Ideally, the tool tip would already be in the target position.
• One such feature is characterized in that information and / or warning is output at a user interface of the bending press and / or the setting process is interrupted if no shadow of the tool tip is detected or if the tool tip is outside a predetermined second area within the light field lies, wherein the predetermined first area lies within the predetermined second area.
• a preferred embodiment is characterized in that the second holder is arranged on a second side of the first platform opposite the first side and is adjustable relative to the first platform by a second adjustment drive, the control device being connected to the second adjustment drive.
• the second holder can thus be moved with the first holder, so that the light from the light barrier always strikes the light receiver.
• the area of the light receiver can therefore be approximately as large as the light field.
• a preferred embodiment is characterized in that the second holder with the light receiver is adjusted to the same extent as the first holder with the light transmitter.
• a preferred embodiment is characterized in that the first adjustment drive can be actuated independently of the second adjustment drive. This allows fine adjustments to be made between the light transmitter and light receiver.
• a preferred embodiment is characterized in that the method comprises an adjustment process with which the light transmitter and the light receiver are adjusted relative to one another by actuating the first adjustment drive and / or the second adjustment drive.
• the light transmitter and light receiver In order to enable optimal (in particular millimeter-precise) positioning of the light barrier, the light transmitter and light receiver must be optimally coordinated with respect to their relative position. Deviations from such an optimal direction can be easily compensated for by this embodiment.
• the adjustment process takes place as a function of the shadow of the tool tip detected by the light receiver, in particular as a function of the position of the tool tip within the light field.
• the tool tip is chosen as the reference point.
• another reference defined by the light field can be used.
• Such an embodiment is characterized in that the light field, preferably in at least one of its edge regions, has a pattern which is variable in the direction of the adjustment movement of the first holder, and in that the adjustment process is relatively dependent on the relative position of the shadow of the tool tip detected by the light receiver to the pattern detected by the light receiver.
• a preferred embodiment is characterized in that the first tool holder is an upper tool holder and the second tool holder is a lower tool holder and / or that the first platform is movable relative to the second platform. It has been shown that an arrangement of the safety device or the holder (s) on the upper, movable platform is more space-saving, in particular if bending operations are carried out in the end region of the guide rail.
• the holders for light transmitter and Lichtemp catcher can be moved into a parking position in which the end faces of the elongated tool holders are released (while the end faces are covered in the working position of the holders). Approaching the parking position enables the bending tools to be changed easily via the front opening (s) of the guide rail.
• a bending press for bending a workpiece, in particular a press brake a first platform with a first tool holder and a second platform with a second tool holder, one of the platforms being movable relative to the other platform for carrying out a working movement, a safety device for generating a light barrier running between the tool holders transversely to the working movement of the movable platform, in particular laser light barrier, which forms a light field in cross section, wherein thelautein device has a first bracket that carries a light transmitter for generating the light barrier, and a second bracket that carries a light receiver for receiving the light of the light barrier, and wherein first holder is arranged on a first side of the first platform and is adjustable relative to the first platform by a first adjustment drive such that the position of the light barrier relative to the first tool holder in the direction of the working movement of the movable Platform is changeable, a control device which is connected to the first adjustment drive, characterized in that the bending press is designed to carry out a method
• Lig. 1 a bending press according to the invention
• Lig. 2 shows a section of a cross section of the bending press with light field with an optimally adjusted light barrier Fig. 3 the light field with bending tool with not yet optimally adjusted light barrier
• FIG. 5 shows a preferred embodiment with a light field which has a pattern in its lateral edge regions.
• Fig. 1 shows a bending press 10 for bending a workpiece 19, here in the form of a press brake.
• a first (upper) platform 1 with a first tool holder 11 is movable to perform a working movement (see double arrow) relative to a second (lower) platform 2 with a second tool holder 12.
• the working movement is effected by the control device 9, which is connected to the press drive 18 and controls it.
• the first tool holder 11 is an upper tool holder and the second tool holder 12 is a lower tool holder.
• the first platform 1 is movable relative to the second, stationary platform 2.
• the bending press 10 comprises a safety device 20 for generating a light barrier 27) between the tool holders 11, 12 transversely to the working movement of the movable platform 1), in particular laser light barrier, which forms a light field 7 in cross section.
• the safety device 20 has a first holder 21, which carries a light sensor 25 for generating the light barrier 27, and a second holder 22, which carries a light receiver 26 for receiving the light of the light barrier 27.
• the first holder 21 is arranged on a first side of the first platform 1 and can be adjusted relative to the first platform 1 by a first adjustment drive 23 such that the position of the light barrier 27 relative to the first tool holder 11 in the direction of the working movement of the movable platform 1 (see Double arrow in Fig. 1) is changeable.
• the first holder 21 is arranged on a first side of the first platform 1 and is adjustable relative to the first platform 1 by a first adjustment drive 23.
• the second bracket 22 is arranged on a second side of the first platform 1 opposite the first side and is adjustable relative to the first platform 1 by a second adjustment drive 24.
• the control device 9 is connected to the first adjustment drive 23 and the second adjustment drive 24.
• Light transmitter 25 and light receiver 26 are also connected to the device 9 Steuereinrich.
• the safety device 20 is designed such that the position of the light barrier 27, which is determined by the position of the light transmitter 25 on one of the holders, can be adjusted relative to the first tool holder 11 or to the tool 8 held therein.
• a (complete or partial) interruption of the light barrier 27 due to an obstacle occurring in the work path (e.g. fingers of an operator) causes a shadow which is detected by means of the light receiver 26.
• the control device 9 connected to the light receiver 26 stops or slows down the working movement of the bending press 10 as a function of a detected shadow (activation of the press drive 18).
• the first tool holder 11 and / or the second tool holder 12 are preferably designed in the form of a guide rail which can have an end-side opening for changing a bending tool 8 at least at one of its ends.
• the method according to the invention is now characterized in that the control device 9, before a bending process or a sequence of bending processes, brings the first holder 21 into a working position by actuating the first adjusting drive 23, in which the tool tip 4 of a bending tool 8 held by the first tool holder 11 lies within the sealing field 7 formed by the folding barrier 27, preferably in a given first area 5 of the sealing field 7.
• the control device 9 before a bending process or a sequence of bending processes, brings the first holder 21 into a working position by actuating the first adjusting drive 23, in which the tool tip 4 of a bending tool 8 held by the first tool holder 11 lies within the sealing field 7 formed by the folding barrier 27, preferably in a given first area 5 of the sealing field 7.
• the setting is preferably carried out such that the control device 9 brings the first holder 21 into the working position as a function of the shadow of the tool tip 4 detected by the spruce receiver 26. If, for example, the tip or its shadow lies outside the target range, that is outside of the predetermined first range, as is the case in FIG. 3, the first holder with the light transmitter is adjusted accordingly by actuation of the adjusting drive 23 until the light barrier takes the position of Fig. 2.
• the distance between the tool tip 4 and the edge 3 of the light field 7 opposite the tool tip 4 is at least one third, preferably at least half, of the expansion of the light field 7 in the direction, in which the working movement of the movable platform 1 takes place, be wearing (see Fig. 2).
• the first holder 21 is now adjusted until the tool tip 4 in a desired position or a desired area within the light field 7, preferably comes to rest in the predetermined first area 5.
• the first holding device 21 can be adjusted when the tool tip 4 outside the predetermined first loading area 5 but still within a predetermined second area 6 within the light field of FIG. 7.
• the predefined first region 5 lies within the predefined second region 6.
• the first holder (21) is adjusted until the tool tip 4 comes to lie in the predefined first region 5 (see FIG. 2).
• the second holder with the light receiver is designed analogously to the first holder and the second holder 22 with the light receiver 26 is adjusted to the same extent as the first holder 21 with the light transmitter 25.
• the light receiver could also be different, in particular stationary, for example if its detection area or its light-sensitive surface covers a larger area (i.e. covers all possible positions of the light field in the direction of the working movement).
• the first adjustment drive 23 can be actuated independently of the second adjustment drive 24, which enables fine adjustment.
• the light transmitter 25 and the light receiver 26 can be adjusted relative to one another by actuating the first adjustment drive 23 and / or the second adjustment drive 24.
• the adjustment process can take place as a function of the shadow of the tool tip 4 detected by the light receiver 26, in particular as a function of the position of the tool tip 4 within the light field 7.
• the tool tip is used as a reference point.
• the light field 7, preferably in at least one of its edge regions, has a pattern 14 which changes in the direction of the adjustment movement of the first holder 21 (see FIG. 5).
• the adjustment process can then take place depending on the relative position of the shadow of the tool tip 4 detected by the light receiver 26 relative to the pattern 14 detected by the light receiver 26.
• tools tip and pattern it can easily be determined whether the light transmitter or the light receiver and also in which direction it has to be readjusted.
• the bending press 10 is in each case designed to carry out a method according to the invention and the control device 9 is configured to control the method according to the invention. er, in particular by evaluating and / or processing the data received or evaluated by the light receiver 26 and / or by adjusting the first adjustment drive 23 and / or the second adjustment drive 24.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Presses And Accessory Devices Thereof (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

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• 2018
  • 2018-07-31 AT ATA50667/2018A patent/AT521528B1/de active
• 2019
  • 2019-07-30 WO PCT/AT2019/060247 patent/WO2020023988A1/de not_active Ceased
  • 2019-07-30 EP EP19765634.1A patent/EP3829793B1/de active Active
  • 2019-07-30 US US17/255,058 patent/US12121953B2/en active Active
  • 2019-07-30 CN CN201980047916.3A patent/CN112437703B/zh active Active
  • 2019-07-30 JP JP2021503893A patent/JP7413347B2/ja active Active

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