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
  • 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
  • B21D5/0272—Deflection compensating 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
  • B30B15/04—Frames; Guides
  • B30B15/044—Means preventing deflection of the frame, especially for C-frames

Definitions

• the invention relates to a method for operating a bending press, in particular Ab ⁇ canting press, as described in the preamble of claim 1.
• DE 32 45 755 A1 discloses a method for correcting the bending line of the bending tool of a bending press, in particular a press brake, in which the lower tool is divided in the direction of the bending line and the tool halves subdivided into tool segments are adjustable transversely to the bending line ,
• the bending line of the upper tool is measured in the vertical plane by means of several encoders.
• the tool segments of the lower tool are partially motorized in analogy to the determined measured values for forming a bending palmar narrowing or narrowing in the horizontal plane corresponding to the bending line adjusted, so that the result is an automatic detection and correction of the bending line is guaranteed.
• a press brake in which the table bar and / or the press bar have a slot extending over almost the entire length and extending over the entire thickness thereof.
• the object of the invention is to provide measures by means of which a plurality of als ⁇ passing load cases of press brakes bearing, an exact adjustment of a curvature of load-dependent bending deformations of the table beam and / or press bar is achieved.
• the surprising advantage here is that a compensation corresponding to the real load and thus deformation values is achieved in order to ensure a high-quality bending deformation, wherein it is further essential according to the invention to convert the bending into a pre-bending and finish-bending operation with a relief of the bending press from the To divide adjusting forces between the processes in order to adjust an adjustment device for forming a deformations on the bending press counter-curvature of at least one Stütz ⁇ surface for the bending tools or tool holders in a load-free Zu ⁇ and thus with significantly reduced restoring forces and be able to take high adjustment accuracy vor ⁇ . But are also advantageous measures according to the claims 2 to 4, because thus a low detection effort is achieved with a rapid translation.
• the advantageous measure according to claim 5 ensures that the effects of asymmetrical loads on the bending behavior of the table beam and the press bar are compensated.
• Fig. 1 is a press brake according to the invention in view
• Fig. 2 is a detail view of the press brake
• FIG. 3 is a perspective view of a load case in the bending deformation of a workpiece
• Fig. 4 is a detail view with a schematic representation of a forming process, in view.
• Fig. 1 is a simplified schematic representation of a press brake 1 is shown, which consists of a machine frame 2, consisting of side cheeks 3, 4, a fixed Pres ⁇ senbalken 5 and a transverse dressing 6 is formed.
• a further press bar 8 is adjustably mounted in a plane formed by the press bar 5 and adjustable relative thereto, which in the ge Service ⁇ th embodiment by on the side cheeks 3, 4 immovably arranged
• Drive means 9, 10 of a drive device 11, eg hydraulic cylinders 12 of a hydraulic drive system 13, is actuated, wherein at least one hydraulic cylinder 12 at opposite end portions 14 of the adjustable press beam 8 with piston rods 15 engages whereby two axle positions 16, 17 are formed for force application of the adjusting forces of the drive means 9, 10 on the press bar 8.
• eccentric arrangements - as shown in subsequent figures - often common. If shorter bending tools 21, 22 deviating from the length 23 are used, they are often off-center with respect to a center plane 27 running perpendicular to a contact surface 26 and parallel to the side walls 3, 4, e.g. positioned to form two or more sets of tools, consisting of the bending tools 21, 22, for alternately use the assembly of the press brake 1 or to achieve a better access with already partially formed, angled workpieces 4 to the Biege ⁇ tools 20, 21.
• the drive device 11 comprises the hydraulic system 13 and essentially has a container 28 for a pressure medium, for example hydraulic oil, a pump unit 29, a control unit 30 and corresponding connection lines. tions 31 for acting on the hydraulic cylinder 12.
• various detection means 32 are provided for the regulation of the hydraulic system 13, wherein, as is known from the prior art, pressure sensors 33 are arranged in the connection lines 31, which preferably directly on the hydraulic cylinders 12 on the input side for pressure determination during a working stroke of the Press bar 8 in the bending operation on the workpiece 4, are attached.
• the operation of the press brake 1 is controlled and regulated by a control and / or regulating device 34, which essentially comprises a computer 35 with data memory 36, as well as required switching and control elements 37.
• the controller 34 is powered by a power source 38, e.g.
• a power grid 39 fed via lines 40 with energy and is connected via lines 41 to be controlled and supplied with energy control, detection and detection means, as these correspond to the prior art and are provided on such bending machines connected .
• a position measuring device 42 is connected in many cases to the control and / or regulating device 34, by means of which the respective setting position of the adjustable press bar 8 with respect to a reference position - selected zero position - is measured and monitored during a displacement process and as a variable Control parameter is used in a control program of a device for Verstellweg horrung.
• the position measuring device 42 is preferably formed by optoelectronic linear measuring rods 43 and an electronic evaluation measuring optics arranged at the two opposite end regions 14 of the adjustable press beam 8, between the latter and the stationary side cheeks 3, 4.
• the arrangement of this path measuring device 42 at the opposite end regions 14 of the Pressenbal ⁇ kens 8 thus also allows the determination of parallelism in the adjustment of Pres ⁇ senbalkens 8 and thus the opposing bending tools 21, 22, and thus the determination and monitoring of an angular position, as occurs with different adjustment paths of the drive means 9, 10 or also to compensate for the different springing of the side cheeks 3, 4, caused by asymmetric load at ex ⁇ centric position of the bending tools 21, 22 at different adjusting forces - according to arrows 44, 45th - And the adjustment can be adjusted to these deformations.
• other devices known from the prior art for example distance lasers, etc., can also be used as the path measuring device 42.
• Fig. 3 the conditions on the adjustable press bar 8 are shown.
• the stationary press bar 5 is to be judged approximately with a counteracting effect.
• the determination of the deformation values is carried out by arithmetic operation carried out in the computer 35, using the determined adjustment forces - Arrow 44, 45 - and the machine data, to be determined directly upon detection of the adjusting forces.
• the press beams 5, 8 are equipped with the adjustable compensation devices 54, and form the support surfaces 18, 19 for the tool holders 20.
• Such Ausretesvorrich ⁇ lines 54 are as manually adjustable or adjustable via drives devices for Er ⁇ planning the Jacobwölbung 52 of the support surfaces 18, 19 for the tool holders 20.
• the bending tools 21, 22 are provided in an eccentric position to the center plane 27.
• a resultant force according to-arrow 55 -from a stress to be applied for the bending deformation of the workpiece 24 in accordance with the bending length 50 is displaced in the direction of one of the drive means 9, 10 by a distance 56 with respect to the middle plane 27 in the case of the assumed load.
• This process serves to determine the actual adjusting forces - according to arrow 44, 45.
• the adjusting forces which are introduced in the axle positions 16, 17, are determined from the measured medium pressure of the pressure sensors 33 and the pressure surface of the Hydraulikzy ⁇ cylinder 12. From the sum of the different sized adjusting forces - according to arrow 44, 45 - the resulting total force is calculated, - according to arrow 55 - which is required for the transformation of the workpiece 24 and results from the torque set the position
• the position of the bending tools 20, 21 and the resulting total force - arrow 55 - and bending length 50 define the concrete load case.
• Each of these load cases is a characteristic, e.g. Kl to KlO for, for example, ten hin ⁇ loaded load cases, as a predetermined set value for the balancing device 54 zu ⁇ ordered.
• a characteristic value K1 to K1 is thus displayed directly on the control and / or regulating device 34 for adjusting the compensating device 54 is used.
• machine-adjustable adjusting drives 61 eg with control drives 61 that can be controlled via the control and regulating device 34, for example for a stepwise adjustment of the compensating device 54 in accordance with the characteristic values K1 to K10.
• this data by arithmetic operations in real time due to a stored in the computer 35 computer program directly from the determination of the adjustment forces - according to arrows 44, 45 - to determine using the fixed machine data and assign the result to the load case approximately corresponding characteristic value, with which adjustment data for the Ausretes ⁇ device 54 are available to a counter-curvature at the support surfaces 18, 19 to adjust.
• FIG. 4 shows, in a schematic representation, the forming and setting process for achieving a high-quality forming of a circuit board 25 and is described with reference to the FIGURE.
• the forming process on the blank 25 for forming a predetermined Um ⁇ forming angle 65 is divided into a pre-bending and a Fertigbiegevorgang.
• the pre-bending and in continuous lines the finished bending situation of the board 25 are shown in broken lines.
• the illustration shows the stationary press bar 5 and the compensation device 54 which forms the support surface 19 on which the tool holder 20 with the bending tool 22 is fastened.
• This arrangement is opposite to the press bar 8, also arranged with the compensating device 54 and the tool holder 20 and bending tool 21 adjustable.
• the drive means 9 is the hydraulic cylinder 12 with a cylinder chamber divided into a pressure chamber 66 and an annular space 67 by a piston 68.
• the supply of the pressure medium from the hydraulic system takes place via the hydraulic control unit 30 and the connecting lines 31.
• the pressure chamber 66 is preceded by a pressure sensor 69 as detection means 32 for an adjusting force during the forming process.
• the bending process is divided into two stages, this being another Possibility of a single-stage bending process can optionally be done.
• the measures described with the adjustment of the compensation device 54 can be made only at the beginning of a series, ie on the first part and the further production with the existing Ein ⁇ settings or the measures described can be done.
• the two-stage bending process can of course be used for every part of a series of parts.
• the exemplary embodiments show possible embodiments of the press brake, 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 combinations of the individual embodiments are possible with each other and this variability Possibility due to the teaching of technical action by objective invention in the skill of working in this technical field expert.
• all conceivable embodiment variants that are possible by combinations of individual details of the illustrated and described embodiment variant are also included in the scope of protection.
• the drive device to operation by means of a pressure medium.
• electromechanical drives e.g. Electromotive spindle drives on which the adjusting forces - arrow 44, 45 - measured or determined by the power consumption of the motors.
• the reference to the characteristics Kl to KlO for the adjustment of the balancing device 54 is only to be understood as an example and can be determined if necessary - whereby a stepless control is conceivable.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Press Drives And Press Lines (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 2004
  • 2004-09-10 AT AT0151204A patent/AT501264B8/de not_active IP Right Cessation
• 2005
  • 2005-08-30 AT AT05773976T patent/ATE390220T1/de not_active IP Right Cessation
  • 2005-08-30 US US11/662,420 patent/US20080066520A1/en not_active Abandoned
  • 2005-08-30 DE DE502005003499T patent/DE502005003499D1/de active Active
  • 2005-08-30 EP EP05773976A patent/EP1793946B1/fr not_active Not-in-force
  • 2005-08-30 WO PCT/AT2005/000346 patent/WO2006026797A1/fr active IP Right Grant

Non-Patent Citations (1)

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