EP2134483B1 - Procédé de détermination d'une valeur paramétrique de réglage d'une presse à cintrer - Google Patents

Procédé de détermination d'une valeur paramétrique de réglage d'une presse à cintrer Download PDF

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Publication number
EP2134483B1
EP2134483B1 EP08714301.2A EP08714301A EP2134483B1 EP 2134483 B1 EP2134483 B1 EP 2134483B1 EP 08714301 A EP08714301 A EP 08714301A EP 2134483 B1 EP2134483 B1 EP 2134483B1
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EP
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Prior art keywords
workpiece
bending
value
eddy current
measured
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EP08714301.2A
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German (de)
English (en)
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EP2134483A1 (fr
Inventor
Burkhard Heller
Martin Ruzovic
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Trumpf Maschinen Austria GmbH and Co KG
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Trumpf Maschinen Austria GmbH and Co KG
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    • 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
    • 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
    • B21D5/006—Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends

Definitions

  • the invention relates to a method for determining an adjustment parameter value of a bending press according to the preamble of claim 1.
  • a fundamental problem with all forming processes is the springback of the workpiece at the end of the forming process by the elastic portion of the deformation of an elasto-plastic material.
  • the workpiece When bending workpieces, in most cases sheet metal blanks, on bending presses between a punch and a die with a V-die, the workpiece must be deformed beyond the desired bending angle to be achieved after relief, because after elimination of the forming force, the bending angle on the workpiece changed by the springback against the pressed state.
  • the requisite readjustment of the machine setting parameters is in many cases based on the experience of the operators, who estimate and manually set the correction value for setting the bottom dead center of the punch movement or the bending force to be applied based on the measured deviation from the setpoint angle, or programmed correction values for the machine control Bending is used. Since information about the forming behavior of the workpiece is already available from the first bending process, in most cases a single bending is sufficient to achieve the required bending angle.
  • EP 1 401 593 B1 describes a method for controlling the stroke of a press brake, in which the thickness difference between the real thickness of a workpiece and the nominal thickness of a workpiece is calculated by the real position of the movement of the punch, in which there is a predetermined change of a parameter, eg the pressure at the press cylinders is compared with the theoretical position of said movement, in which it should come to this change of the parameter. Furthermore, during the bending process by an electronic control device, the measured values of the movement of the punch and of the parameter, for example the pressure of the pressing cylinders, are processed during the phase of the plastic deformation of the work piece being bent.
  • a parameter eg the pressure at the press cylinders
  • a disadvantage of this method is that the determination of the forming force Umformweg course, eg by vibrations in the drive system of the press bar or unpredictable slip-stick effects between press tool and workpiece is subject to uncertainties and to carry out the required measurements, a reduction in the pressing beam speed is required.
  • an electronic control system for a press brake which also measures the position of the ram and scans the force applied to the workpiece, detects deviations from a model formed by measurements on curved test pieces, and optionally sets stamp movement correction values.
  • the control system works adaptively by relating data determined on test workpieces on the deformation force profile, workpiece thickness and bending angle obtained at certain setting values and then calculates the bottom dead center of the punch movement required for achieving a specific desired bending angle in production workpieces after determining the deformation force profile and the workpiece thickness. Also in this method, the determination of the Umformkraft-Umformweg-course for the same reasons is subject to uncertainty, which in turn leads to deviations of the actual bending angle of the target value.
  • a spring coiling machine in which a measured variable, which is detected by a arranged in front of the wire transducer measuring sensor of a measuring device, can influence the Drahtumformstrom to keep the geometry of produced springs in a predetermined desired range.
  • the measuring device comprises means for detecting measured variables that can be influenced by induction or eddy currents.
  • the Research Disclosure "Adaptive Correction During Forming" reports on a process for adapting the parameters of a forming process to the actual properties of the starting material, using an eddy current / induction measurement method to determine the formability or deformation behavior of the starting material is determined.
  • an eddy current / induction meter is used to check the starting material and read the measured value into a model that describes the relationship between the measured and set values of the forming process.
  • the model then supplies the adjustment values suitable for the currently determined formability of the starting material, which are forwarded to a machine control and automatically adjusted on a forming machine.
  • This method can also be used, for example, for bending sheet metal or sheet metal strips.
  • the object of the invention is to provide a bending method which can achieve a particularly high bending angle accuracy by determining fluctuations in the properties of the starting material and taken into account in the bending process and which can optionally be introduced subsequently to existing installations with only minor structural measures.
  • the essential advantage here is that, according to the eddy current measurement on the workpiece, which is carried out to determine workpiece properties and subsequent establishment of the setting parameter value, the estimation of the deformation behavior of the workpiece carried out by means of the model of the bending process is checked for correctness by a concrete measurement of the actual value of the target becomes. The validity or validity of the model used to determine the adjustment parameter can thereby be monitored and, if necessary, refined or corrected. This is particularly advantageous if the model of the bending operation is still in the production phase and the application without the measurement of the target size in the production still gives rise to uncertain setting parameter values for the bending machine.
  • the model After prolonged use of the method according to the invention, the model has a high prediction accuracy and the setting parameter values determined therewith result in actual values of the target variable which are very close to the setpoint value.
  • the number of measurements of the actual values of the target size can be reduced and, in particular, the workpieces can be bent with high accuracy solely on the basis of the setting parameter values determined with the model for the respective workpiece.
  • the final setting of the setting parameter value is carried out before the actual bending process, whereby it can be performed at full speed and without interruption.
  • the invention makes use of the finding that the electromagnetic properties of a workpiece accessible via the eddy current measurement correlate with geometrically and / or mechanically technological workpiece properties, such as sheet thickness, yield strength, tensile strength, uniform elongation, modulus of elasticity, solidification exponent or rolling direction of the workpiece, and the electromagnetic field Properties can therefore be used as a characteristic of the workpiece for a determination of a Einstellparameterhongs for a bending operation. From a deviation of the measurement result of the eddy current measurement from a nominal value can be concluded that a corresponding deviation of a mechanical characteristic of a nominal value and thereby the Einstellparameterwert be corrected to a Nenneinstellwert.
  • the measurement of the actual value of the target size is performed after a relief of the workpiece before the completion of the bending process, ie at an intermediate relief
  • a target value of the bending angle of 90 ° the bending process at a bending angle of about 100 ° (obtuse angle) are interrupted and after the withdrawal of the force exerted by the punch on the workpiece bending force, ie in the unloaded state, the actual value of the previously achieved bending angle measured and with the effective before the relief Einstellparameterwert, eg
  • the immersion depth of the punch and the measured value of the eddy current measurement are combined to form a value group. If the measurement results in a bending angle of 102 ° instead of the expected 100 °, this means that the actual formability of the workpiece is smaller than would be expected from the parameters used to determine the setting parameter value.
  • adjustment parameters for the bending process for example, the stroke or immersion depth of a punch, the maximum hydraulic pressure in the press cylinders, a maximum applied bending force, forming force or pressing force and a deflection compensation parameter thus a correction value for the crowning of the lower tool to compensate for the deflection of the press bar, wherein the method is not limited to the definition of a single one of these adjustment parameters, but also several as well as other setting parameter values can be determined simultaneously.
  • the measurement of the actual value of the target variable can be carried out with an automatic measuring device on the bending press, for example, with an integrated into the punch angle measuring device similar to a réellemesstaster.
  • the time required to carry out the measurement can thereby be kept as low as possible, since the workpiece does not have to be removed from the bending press for measurement.
  • the information from the measurement of the target size can now be used to reset the setting parameter value, e.g. in such a way that the measured value is fed to the control device and the bending process is continued with corrected adjustments, taking into account the deviation of the workpiece from the originally assumed nominal formability characterized by nominal values of the workpiece characteristics, very close to the actual value of the target to approach the setpoint. It is thus possible, based on the actual value of the target variable measured after the unloading of the workpiece, to reset the value of the setting parameter value for the continuation of the bending operation by the control device and thereby to carry out an inline correction of the setting parameter value.
  • the model of the bending process is adapted based on the actual value of the target variable measured after the unloading of the workpiece and the measured value of the eddy current measurement representing a parameter of the workpiece and the setting parameter immediately before the unloading.
  • the correlations contained in the model from the value of the setting parameter, characteristic of the workpiece from the eddy current measurement and respectively caused thereby value of the target size are quasi supplemented by the relationship determined on the current workpiece, the model thereby subjected to a learning process and thus further improved with each workpiece and, so to speak trained.
  • the model of the bending process is composed of the information of the individual data sets and can be present as a database, or also by analytical methods in a calculation rule that maps the relationship between the result of the eddy current measurement, setting parameter value, possibly further known parameters of the workpiece and value of the target size, be convicted.
  • the model of the bending operation in the control device may be formed by a multi-data set table or database and serve as a look-up table, by means of which the setting parameter value is determined essentially by searching and evaluating data records having similar values to the current workpiece becomes.
  • the value table can also include data records which have been created using numerical methods, in particular simulation calculation, finite element methods, regression calculation or interpolation calculation.
  • the model can be built with few measured workpieces and the effort to create the model can be reduced.
  • a similar method is that an estimate of a characteristic of the workpiece is derived from the measured value of the eddy current measurement, and this estimated value is used by the control device in determining the setting parameter value.
  • the result of the eddy current measurement can also be used for the indirect determination of further characteristics of the workpiece, which are used in the definition of the setting parameter value.
  • the result of the eddy current measurement can be used for estimating a mechanical characteristic such as the yield strength used as a characteristic of the workpiece by the controller for establishing the setting parameter value, such as control devices of conventional bending machines with nominal values, for example supplier information, of the workpiece characteristics is performed by default.
  • the determination of this estimated value is based on a model of the material properties, which contains a correlation between the measurement result of the eddy current measurement and mechanical-technological parameters of the workpiece, the eg from test series of material testing, in which the results of the non-destructive eddy current measurement are correlated with results of destructive testing methods of mechanical material properties.
  • the model can advantageously be included as a calculation rule or look-up table in a memory of the control device and the evaluation of the eddy current measured value as an estimated value of a mechanical parameter can also be carried out by the latter.
  • a further development of the aforementioned method consists in linking the estimated value to a nominal value of the same parameter of the workpiece, in particular by forming a weighted mean value, and using this as a parameter for determining the setting parameter value.
  • the nominal value of the material parameter for example, the thickness as the geometric characteristic of the workpiece or the proportionality limit Rp0.2 as the mechanical-technological parameter of the workpiece may be mentioned at this point.
  • a determined by means of an eddy current measurement mechanical characteristic of a workpiece can also be used as a parameter of a workpiece for the control of any bending press, beyond also for subsequent processing steps on other processing machines, where this parameter has significant influence, are used.
  • the relationship between the results of eddy current measurements and the mechanical characteristics can also be determined, for example, by eddy current measurements and subsequent destructive or non-destructive material testing on test workpieces become.
  • each of the two values subject to certain uncertainty - estimated value or nominal value of the parameter - can be included in the calculation with a value, in particular between 0 and 1, depending on the value given to higher significance.
  • the nominal value of 0.75 may be given a higher weight in the formation of the mean value than the estimated value of 0.25 determined from the eddy current measurement.
  • a similar method is that during the bending process, a course of a bending force or a directly related bending force parameter, for example the hydraulic pressure acting in the press beam drive, is detected and fed to the control device the bending force, the bending force parameter or a calculated value of a mechanical characteristic of the workpiece selected from a group comprising yield strength, proportional limit, elongation at break, uniform elongation, modulus of elasticity is used as a parameter for reestablishing the adjustment parameter value before the end of the bending process.
  • a course of a bending force or a directly related bending force parameter for example the hydraulic pressure acting in the press beam drive
  • the respectively measured bending force can be used for example directly without calculation of mechanical-technological parameters of the workpiece to correct one or more based on the measured value of the eddy current measurement Einstellparameterhong, such as in the determination of a deflection parameter value is used to the curvature of the lower tool or . of the fixed press beam to the at each bending force applied to adapt occurring deflection of the movable press beam.
  • the deformation can be adjusted by actively changing the curvature of the fixed pressing beam, z. Example by adjusting cooperating wedge elements in construction of the fixed press beam or by changing the bending stiffness of the fixed press beam, for example by weakening slots whose effective length is variable by adjustable pressure pieces.
  • the Umformweg in the case of a bending press brake the path of the punch from the contacting of the unbent workpiece or the immersion depth, is preferably removed by means of transducers in the region of the adjusting device for the movable beam; the forming force or bending force can be measured directly by means of load cells and taking into account the dead weight of the press beam and pressing tools, or indirectly determined by a hydraulic pressure acting in the adjustment or detected in an electric press beam drive power consumption.
  • a further variant of this method consists in linking the calculated value of the mechanical parameter determined from the course of the bending force with an estimated value of the same mechanical parameter of the workpiece derived from the measured value of the eddy current measurement, in particular by forming a weighted mean value and as a corrected parameter for the renewed Setting the setting parameter value before the end of the bending operation is used to again perform a form of inline correction, whereby the target size is better approximated to the target value
  • the determination of the estimated value is based, as already described above, on a model of the material properties, which contains a correlation between the measurement result of the eddy current measurement and mechanical-technological parameters of the workpiece, which originate, for example, from test series of material testing. Similar to the above for determining the setting parameter value of the derived from the eddy current measurement estimate of the workpiece characteristic and a nominal value of the same workpiece characteristic was linked in this process variant, the calculated value of the workpiece characteristic with the estimated value of the workpiece characteristic to set the Einstellparameterwert.
  • the control device can calculate the link in particular by a weighted mean value, whereby, depending on the choice of the weights, the validity of the eddy current measurement or the deformation force measurement can be rated higher.
  • the weighting factors may each assume values between zero and one, i. the determination of the setting parameter value can in extreme cases also depend entirely on one of the two values. In general, however, an equivalent weighting of 0.5 each in the formation of the weighted average will be beneficial.
  • the calculated value of the mechanical parameter determined from the course of the bending force can be linked to the measured value of the eddy current measurement, and the model of the workpiece properties can be supplemented by this pair of values and thereby adapted the eddy current measurement based estimates of the mechanical characteristic are improved.
  • This influence on the relationship can be effective for a single bending operation, however, the connection can also be adapted permanently and the method can also be performed self-learning, if with each bent workpiece the result of an eddy current measurement and the setting parameter value with the actual, measured value of the target size is linked. This can e.g. be carried out by measuring the actual bending angle achieved on a workpiece after completion of the bending process and added to the measurement results of the eddy current measurement or the Einstellparameter publish this workpiece.
  • the model of the forming operation can be further refined if the estimated value of the mechanical characteristic and the measured value of the eddy current measurement determined on the same workpiece is stored in the control device in the form of a data set, in particular one containing data sets from other workpieces, the model of the bending process forming table of values or database is added.
  • the bending model based on a correlation between eddy current measurement and workpiece properties can be further improved.
  • the mechanical characteristic value calculated from the deformation force curve during the bending process can be used to determine the relationship between the result of the eddy current measurement and the value of the target variable on the basis of the adjustment parameter value Workpiece - the model of the bending process - influence or adapt.
  • the relationship between results of the eddy current measurement and measured by methods of material testing yield strengths or Dehnskyn can be supplemented by pairs of values from eddy current measurements and bending force curves during bending operations calculated yield strength or yield strength.
  • At least one characteristic of the workpiece selected from a group comprising workpiece thickness, weight or workpiece surface determined by a measurement before or during the bending process and the control device is supplied and used in the determination of the Einstellparameterwerts becomes.
  • the thickness of the workpiece as well as mechanical-technological material characteristics directly influence the target size, e.g. has the bending angle, it is advantageous to detect deviations from the nominal thickness before or during the bending process and to take into account when setting the setting parameter value.
  • the thickness measurement As a method for the thickness measurement, all measurement methods known to the person skilled in the art can be used, using contact or non-contact measuring methods which can be carried out independently of the bending press but also inside the bending press or during the bending process. To minimize the measurement effort while the thickness measurement can be limited to those sections of the workpiece that are mechanically stressed during the bending process. Depending on the setting options of the bending press, several thickness measurements can also be made per workpiece and, if the bending press permits, several, optionally different setting parameter values can be defined over the workpiece width.
  • An expedient embodiment of the method according to the invention is according to another claim in that the eddy current measurement is largely limited to zones in the workpiece, which are deformed during the bending process. This can be accomplished by selecting exciter units and multiple sensor units having a high local measurement point resolution and arranged along a straight line. As a result, the measurement can be essentially limited to the forming zone and thus more accurate setting parameter values can be determined.
  • the eddy current measurement is carried out according to a further claim with at least two different, in particular at least ten different excitation frequencies of the electromagnetic alternating field. Since the electromagnetic alternating field influenced by the workpiece and thus the reaction to the sensor unit is strongly dependent on the excitation frequency of the alternating electromagnetic field and depending on the structural properties and thus also the mechanical technological properties of the workpiece at different excitation frequencies for each type of material a typical electromagnetic reaction gives the sensor unit, the relationship between results of the eddy current measurement and mechanical characteristics of the workpiece using multiple excitation frequencies can be determined more accurately. By applying at least ten, preferably twenty to thirty different exciter frequencies, a broad frequency spectrum can be covered and the estimates for the mechanical characteristic and thus also the accuracy of the achieved bending angle can be improved.
  • a very high number of excitation frequencies can be used for eddy current measurement, for example, by the exciter frequency is continuously changed from a minimum frequency to a maximum frequency, so a frequency range is traversed, which also results for each material characteristic a typical measurement result that with the interesting parameter of the workpiece can be related.
  • the eddy current measurement is performed, for example, such that the sensor unit comprises a sensor coil and in the eddy current measurement, the change in the impedance of the sensor coil caused by the reaction of the workpiece is determined.
  • the current flowing in the sensor coil current amplitude and phase is measured, which can be deduced from the change in these values by the approach of the workpiece to be measured to the sensor coil on the electromagnetic properties of the material of the workpiece. Since the electromagnetic reaction of the workpiece also acts on the exciter unit, it is also possible for the exciter unit to simultaneously act as a sensor unit, i. the sensor coil is formed by an exciting coil itself.
  • the target variable is a geometric parameter obtained on the workpiece selected after the bending process and selected from a group comprising bending angle, side length, radius of curvature the bending zone, parallelism or crowning of the workpiece is used.
  • the results of the eddy current measurements are directly related to the target of the bending process, allowing the adjustment parameter value required for achieving a particular target value of a target to be identical to those of the eddy current measurement in the case of the workpiece and the bending press identical to previous bending operations can be determined.
  • a favorable variant of the method is that the relationship between eddy current measurement and the target size of the workpiece - the model of the bending process - is produced by regression calculation and / or correlation calculation from results of previous eddy current measurements on several workpieces and values of the target size measured on the respective workpiece , With the aid of these calculation methods, a large number of measurement results can also be combined and stored, for example. be incorporated into a calculation rule for the setting parameter value. The implementation of this calculation method is easily possible with the electronic control devices used on today's bending machines.
  • a further advantageous implementation of the method is given by the fact that, according to two further claims, the relationship depicted in the model of the bending process is produced with the aid of a neural network, in particular using a back-propagation process from results of a sequence of bending operations.
  • a neural network With the aid of a neural network, nonlinear, multi - parameter relationships, as they are effective in a bending process, can be mapped in a self - learning model, which is also able to take into account deviations of individual workpiece parameters in the determination of the setting parameter value, without the physical relationships between The individual workpiece parameters must be specified in terms of formula or as a calculation rule the calculation system.
  • the definition of the setting parameter value can also be carried out with the aid of fuzzy logic control, which leads to deviations in the characteristics of the workpiece compared to the values in one or more bending processes on specimens necessary corrections in the determination of the setting parameter value.
  • the attachment of the information may be e.g. done with an inkjet printer or with laser radiation.
  • the method proves to be carried out according to a further claim, the bending process as a free-bending process on a bending press in the form of a press brake. Due to the widespread use of this method and the high number of workpieces processed with it, it is possible in this method within a short time to collect a large amount of data for establishing a correlation between results of the eddy current measurement and values of the target size.
  • the eddy current measurement the comparison of the result of the eddy current measurement with the relationship between the results of the eddy current measurements and the values of the target size, the handling of the model of the bending process or the material properties, the setting of the Einstellparameterhongs or the calculation of the mechanical characteristic is advantageous with the electronic control device carried out.
  • the electronic control devices used in modern bending presses offer in many cases sufficient memory and computing power to perform the necessary calculations in sufficient speed, or are at least prepared for expansion with suitable calculation modules. In principle, these calculations can also be performed without automated computer support, which, however, only makes sense in the initial phase during the development and initial parameterization of the calculation algorithms.
  • the advantage of this manufacturing facility is that with The results of the eddy current measurement on a workpiece to be bent by the electronic control device of the bending press automatically and by estimating the forming properties by means of an eddy current measurement and based on fixing a Einstellparameterwerts the press brake, the angular accuracy of the Bending press is increased.
  • the eddy-current measuring device can be arranged, for example, away from the bending press, for example in the region of an upstream laser cutting machine, in which the process-related lying time is used for the eddy-current measurement.
  • the eddy-current measuring device comprises an excitation unit for generating an electromagnetic alternating field acting on the workpiece and a sensor unit for detecting the reaction to the alternating field caused by the workpiece.
  • excitation unit for generating an electromagnetic alternating field acting on the workpiece
  • sensor unit for detecting the reaction to the alternating field caused by the workpiece.
  • the sensor unit may comprise a sensor coil and / or a Hall sensor for measuring the magnetic field, wherein the measurement sensitivities are selected according to the material groups to be measured.
  • the exciter unit and the sensor unit are mounted in a flexible manner, in particular also with a movable suspension, in particular with a cardan suspension on the eddy current measuring device.
  • This measurement errors are largely avoided by undefined air gaps between the workpiece and the eddy current measuring device, which can easily occur in a rigid suspension, if the positioning of the workpiece is not quite accurate or has this shape deviations.
  • the measuring sensitivity of the eddy current measuring device can be further improved by the suspension consists essentially of non-magnetic material and the measuring fields are essentially influenced only by the workpiece and not by the eddy current measuring device itself.
  • An expedient embodiment of the production device consists in that the eddy-current measuring device is arranged in the region of the machine frame, the stationary beam, a positioning device or a depositing station for workpieces.
  • This arrangement in the immediate area of the bending press causes short ways for the operator of the machine as well as for the workpieces and further allows easy connection of the eddy current measuring device to the electronic control and monitoring device, which is also arranged on the bending press in most cases.
  • the bending press comprises a force measuring device for measuring the bending force exerted on the workpiece by the bending tools, and the force measuring device is communicatively connected to the control device.
  • the force measuring device may include force sensors for direct measurement of the bending force or pressure sensors for the indirect measurement of the bending force in a fluidic pressure bar drive, these measuring methods are already known from the prior art.
  • the production device in particular the bending tool of the bending press advantageously comprises an angle measuring device connected to the control device, with which the bending angle can be determined in the unloaded state of the workpiece.
  • the handling of the workpieces on the production facility often means a high repetition rate for the operating personnel with a high level of required attention. It is therefore economically advantageous especially for larger batch sizes, if according to another claim in the field of bending press arranged with a gripping device handling device for handling the workpieces is arranged. This can on the one hand exhausting and highly repetitive activity for the operator On the other hand, the product quality can be reliably ensured at a high level, since errors due to fatigue and concentration errors are avoided.
  • the handling device is preferably designed like an industrial robot with a programmable robot arm, wherein a balanced compromise between sufficient stability to achieve a high repeatability, as well as a slim, space-saving design, so that even small workpieces reliably detected by the gripping device and the bending tool can be introduced.
  • the gripping device can be designed as a gripper gripper, which detects the edge of a workpiece, or as a vacuum suction device, which detects a workpiece by one or more vacuum elements on a surface.
  • the manufacturing device is equipped with a handling device
  • the eddy-current measuring device may also be expedient to arrange the eddy-current measuring device on the handling device, in particular in the region of the gripping device. Thereby, the eddy current measurement can be performed while the workpiece is held by the gripping device, e.g. that is, during feeding from a ready position to the bending tool.
  • the eddy current measuring device comprises a holding device for a workpiece.
  • This holding device ensures a positioning that is the same for all workpieces with respect to the exciter unit and sensor unit and that random measurement errors, e.g. by fluctuating air gaps between the workpiece and eddy current measuring device can be avoided.
  • An advantage is also an embodiment of the production device in which the production device, in particular the eddy-current measuring device, comprises a thickness measuring device.
  • the production device in particular the eddy-current measuring device, comprises a thickness measuring device.
  • the eddy-current measuring device may be coupled with a separating device for workpieces to be bent, provided in stacks.
  • a manufacturing device which is equipped with a handling device
  • the separation can be done, for example, by a special Saugkopf term, pneumatically, by means of magnetic force, stripping or the like, further, the separation by blowing devices or vibrators, which act on the stack can be facilitated.
  • the separating device can also be equipped with a device for detecting double withdrawals.
  • Fig. 1 schematically shows a manufacturing device 1, comprising at least one bending press 2 and a control device 3, which is connected to the bending press 2 wired or wireless communication via radio.
  • a workpiece 4 to be bent can be processed by the action of force of a bending tool 5 arranged on the bending press 2 to form a bent workpiece 6.
  • the workpiece 4, 6 consists of sheet metal, which is usually present as a board or blank.
  • the workpiece 4 may consist of any material suitable for bending forming and may be made of semifinished product by any suitable method such as laser cutting, knife cutting, shearing, biting, punching, nibbling, etc.
  • the control device 3 uses control signals to transmit setting parameters which influence the execution of the bending process to the bending press 2, such as, for example, an insertion depth of a bending punch or a bending force exerted on the workpiece 4.
  • setting parameters which influence the execution of the bending process
  • the actual values of a target variable on the bent workpiece 6 can be influenced by varying a setting parameter value.
  • a main task of the control device 3 is therefore the definition of one or more setting parameter values, one or more actual values of target variables on the curved Workpiece 6 as close as possible to predetermined setpoints.
  • the parameters of a workpiece 4 to be bent 4 fed to the control device 3 are therefore more or less subject to uncertainties, for which reason it is attempted to take into account as much relevant information as possible about a workpiece 4 when setting a bending process.
  • a workpiece 4 to be bent is subjected to an eddy current measurement with the aid of an eddy-current measuring device 8 and the measured value 9 of the eddy current measurement is fed to the control device 3 as a further parameter 7, the eddy-current measuring device 8 being discussed in more detail later.
  • the controller 3 is supplied as information about the bent workpiece 6, a target value 10 of a target size 11, which can be influenced by the choice of the settings of the bending press 2.
  • the target size 11 is given in the exemplary embodiment by the bending angle 12 on the bent workpiece 6. Since the desired value 10 of the bending angle 12 before the bending process only represents a desired state on the bent workpiece 6, this information supplied to the control device 3 is shown in dotted lines.
  • a setting parameter value 14 for example an immersion depth 15 of a Bending punch, transferred to the bending press 2.
  • an actual value 16 of the target size 11, for example, the bending angle 12 causes, then the actual value 16 is measured and fed to the control device 3.
  • the measurement of the target size 11, or its actual value 16 takes place after a discharge of the workpiece 6, whereby the elastic portion of the deformation degrades and the actual value 16 remaining on the bent workpiece 6 can be measured.
  • the link can consist, for example, in combining these values into a data set which maps a relationship between these three values and can be used as information about the forming behavior of the workpiece 4, 6.
  • Fig. 2 the sequence of the method according to the invention is shown in more detail in the form of a flow chart.
  • the control device 3 - shown as a block with dashed lines - are supplied before the start of a bending process characteristics 7 of the workpiece 4 to be bent and one or more set points 10 of a target size 11, for example, the bending angle 12.
  • the control device 3 comprises a machine control with the usually contained hardware and software, ie components such as arithmetic unit, memory unit, interfaces for data input / output and will not be explained in detail at this point.
  • the control device 3 comprises the model 13 of the bending process 3 executable forming process in the form of software and data.
  • the model 13 is in Fig.
  • the characteristics 7 of the workpiece 4 to be bent in their entirety provide the information about the forming behavior of the workpiece 4, which can not be described by a simple value.
  • Characteristics 7 are the bending process directly or indirectly influencing characteristics such as thickness, yield strength, proportionality limit, Young's modulus, rolling direction, uniform strain, solidification exponent, etc., and the results of the eddy current measurement usable.
  • a first parameter 7a is predetermined, for example, by a nominal value 17 of a mechanical-technological parameter 7.
  • a nominal value 17 of a mechanical-technological parameter 7 For example, from supplier information a yield strength of 400 N / mm 2 for the workpiece 4 is known. Due to the production-technological fluctuations such information is, however, always associated with a blur, since the cost of the exact determination would be much too high for each workpiece, and therefore always from a nominal value 17 with a probable range of variation is assumed.
  • the nominal values are usually based on one production lot, ie correspondingly many workpieces 4 A yield point on a concrete workpiece 4, which however deviates from the nominal value 17 by about 5%, is not uncommon, for example 380 N / mm 2 or 420 N / mm 2
  • fluctuating actual values 16 of the target quantity 11 are often not permissible in the case of high accuracy requirements with respect to the permissible deviation of the actual value 16 of the target quantity 11 from the nominal value 10.
  • one or more characteristic values 7b of workpieces 4 to be bent are used in the setting of the setting parameter value 14, which are determined by a measurement on the workpiece 4 to be bent, ie one or more measured values 18 of a parameter 7.
  • a thickness 19 of the workpiece 4 is indicated by means of a thickness measuring device 20.
  • the thickness measuring device 20 may comprise measuring means or measuring arrangements with mechanical, electrical, magnetic or optical measuring principle such as laser, as well as combinations thereof and the thickness 19 of the workpiece 4 touching or contactless measure and the control device 3 are supplied.
  • Another parameter 7c which is supplied to the control device 3, is formed by a measured value 9 of an eddy current measurement carried out on the workpiece 4 to be bent.
  • the workpiece 4 is exposed to an eddy current measuring device 8 an electromagnetic alternating field and measured the reaction of the workpiece 4 to the alternating field.
  • the eddy current measuring device 8 comprises an excitation unit 21 with an excitation coil through which an alternating current flows and a sensor unit 22 with a sensor coil exposed to the alternating field and with an electronic evaluation device for measuring at least that occurring in the sensor coil Currents are connected according to amplitude and phase position or phase angle and preparation of the measurement signals to further processed measured values 9, which can be arranged directly in the eddy current measuring device 8, but can also be assigned to other assemblies of the production device 1.
  • a Hall sensor for measuring the magnetic field caused by the eddy current or influenced by the workpiece 4.
  • the preparation can consist in particular in an amplification of the measurement signals.
  • the excitation unit 21 alternately excites the alternating electromagnetic field with a plurality of, preferably thirty, different frequencies, and measures the corresponding retroactivity of the workpiece 4 to the electromagnetic alternating field with the sensor unit 22 for each exciter frequency. Due to the frequency dependence of the electromagnetic properties, a typical frequency-dependent electromagnetic feedback is obtained for each type of material and its microstructure, based on the previously carried out eddy current measurements and measured actual values 16 of the target 11, e.g. an achieved bending angle 12, a setting parameter value 14 for the bending process of the workpiece 4 can be set.
  • the implementation of an eddy current measurement requires that the workpiece 4 can influence the magnetic field due to its material properties, in particular its electrical conductivity and its magnetic permeability, which is why the application of the method is particularly suitable for electrically conductive workpieces 4.
  • the application of the method is not limited to metals or composites of metals and non-metals, as other materials, such as e.g. Plastics although small, but effective and thus measurable changes in the measured magnetic field can cause.
  • the measurement results of the eddy current measuring device 8 and the thickness measuring device 20 are transferred to the electronic control device 3 of the bending press 2, with which in particular the tool movements during the bending process and / or the bending force exerted by the bending tool 5 on the workpiece 4 are controlled and monitored. Furthermore, the Control device 3 can be used to control the crowning of a lower tool to compensate for the deflection of the upper, movable press beam.
  • the control device 3 includes, as already mentioned, one or more computing units, memory units, input and output units with interfaces for signal input and signal output, as they are usually used for the control and monitoring of manufacturing equipment, in particular bending presses 2.
  • control device 3 and the model 13 of the bending process can be arranged in a common housing, but also spatially removed and data-related, e.g. when the model 13 is included in a separate control of the eddy current measuring device 8.
  • the target size 11 used in this method is the bending angle 12 obtained on a bent workpiece 6 after a bending operation.
  • the workpiece 4 in the bending press 2 is pressed by means of a punch 23 into a die 24 with a V-die 25 .
  • the degree of deformation and thus also the achieved bending angle 12 is dependent on the given workpiece properties and tool geometry primarily of the immersion depth 15 of the punch 23 in the die 24.
  • As adjustment parameter value 14 which influences and determines the achieved bending angle 12 in this exemplary embodiment a certain insertion depth 15, that is to say the forming path between the first contact point 26 between punch 23 and workpiece 4 and bottom dead center 27, is selected.
  • the bending force exerted on the workpiece 4, 6 by the punch 23 can be used at the end of the deformation since, like the insertion depth 15, this directly influences the bending angle 12 achieved after the bending operation has been carried out, since the punch 23 is at higher Bending force continues to penetrate into the die 24 and the workpiece 4, 6 is correspondingly more deformed.
  • the result of the eddy current measurement can be used to determine the bending force or a deflection compensation on the bending press 2 as setting parameter value 14.
  • This feedback of the result of the bending operation can now be used to redetermine the setting parameter value 14 with the now additional information about the forming behavior of the workpiece 4, 6 in the case of an intermediate relief for the rest of the bending operation, in particular if the actual value 16 of the target size 11 of the due significantly deviates from the original values expected actual value.
  • the linkage may also be to adapt the model 13 of the forming operation to the values of the actual value 16, the setting immediately before release and the measured value 9 of the eddy current measurement from previous bending operations or an assumed relationship between be added to these values. These values can be used as data points to analyze and correct the correlations and dependencies used so far between them.
  • the bending accuracy increases enormously by this return of the bending result with the effect of a control process and the model 13 of the bending process is thereby constantly improved.
  • the model 13 that is to say the relationship between measured values 9 of the eddy current measurements, setting parameters 14 and actual values 16 of the bending process, is so mature that the measurement of the actual values 16 can be dispensed with and the bending operations carried out even more economically can be. Bending to correct the bend angle 12 is generally unnecessary at this stage.
  • the model 13 with the relationship between measured values 9 of the eddy current measurements and the actual values 16 of the target variable 11 on the workpieces 4, 6 - in this case the bending angles 12 - can be contained in the control device 3 in various ways.
  • the measurement results from previously, e.g. Bending processes carried out on test workpieces in a test or training phase are stored together with the respective setting parameter values in data sets from which the model 13 is determined by means of regression calculation and / or correlation calculation and used to determine the setting parameter value 14.
  • Another possibility of constructing the model 13 is, after bending operations on workpieces 4, 6, to transmit measured values 9 of the eddy-current measurements, the setting parameter values used and the measured actual values 16 of the target variable 11, ie the bending angle 12, to a self-learning neural network, is trained using a back-propagation process so that from the measured values 9 of an eddy current measurement, the determination of the setting parameter value 14 by the electronic control and monitoring device 3 can be done.
  • a modification of the previously described method for establishing an adjustment parameter value 14 is, during the bending process, a bending force curve 28 - in Fig. 2 shown in dashed lines - to capture, which also information about the forming behavior of the workpiece 4, 6 can be obtained.
  • the measure to further increase the bending angle accuracy is to detect during the bending process the course of the bending force as a function of the workpiece deformation and from this a calculated value of a mechanical characteristic 7 of the workpiece 4, 6, in particular the yield strength of the workpiece 4, 6 and take into account in the determination of the setting parameter value 14.
  • the bending force can for example be measured directly by load cells, strain gauges, piezosensors in the press beam drive or calculated by a hydraulic pressure of the press beam drive or the power consumption of an electric press beam drive; the workpiece deformation by a displacement measuring device, which measures the displacement of the movable press beam relative to the machine frame.
  • This information about the forming behavior obtained directly from the workpiece 4, 6 to be bent can be used to establish the setting parameter value 14.
  • This metrologically determined yield strength is often more meaningful than the nominal values 17 of the strength announced by the supplier of the material, and the setting of the setting parameter value 14 is therefore possible with greater accuracy.
  • This measure can be used according to the invention alternatively for returning the actual value 16 of the target size 11, but also be used in addition.
  • this information can be used to modify the relationship between measured values 9 of eddy current measurements and the target quantity 11, i. the method can be designed self-learning by evaluating the individual bending processes.
  • the actually achieved bending angle 12 is measured after the bending process, which can even be automated by a suitable angle measuring device installed in the bending tool 5, and together with the measured values 9 from the eddy current measurement and the other machine settings determined on the basis of the parameters, the previously used model 13 between measured values 9 of the eddy current measurement, setting parameter value 14 and actual values 16 of the target variable 11 - the bending angle 11 - added.
  • Fig. 3 another method for setting an adjustment parameter value 14 is shown, which uses an alternative use of the measured values 9 of the eddy current measurement in comparison with the methods described so far. In this case, these are used to determine an estimated value 29 for a mechanical characteristic 7, in particular the yield strength or yield strength, and to use this for determining the input parameter value 14 for the control device 3.
  • the setting parameter value 14 - in this case the immersion depth 15 - set.
  • the relationship between measured values 9 of the eddy current measurement and the mechanical parameter 7, in particular the yield strength or the yield strength used for determining the estimated value 29, is defined by a material model 30. This can be determined like the model 13 of the bending process on trial workpieces or based on analytical considerations.
  • the actual yield strength is determined, for example, by destructive tensile testing.
  • the determined estimated value 29 is subsequently linked to a nominal value 17 of a workpiece characteristic variable 7, in particular from both a weighted average value is formed as characteristic variable 7 d and supplied to the control device 3 or calculated by the latter itself.
  • Fig. 4 is a manufacturing device 1 for the angular exact bending of workpieces, in particular according to the method described above.
  • This comprises a bending press 2, in particular in the form of a press brake for bending of workpieces 4, 6 between a punch 23 and a die 24 with a V-die 25.
  • the bending press 2 consists essentially of a machine frame 31, one on the machine frame 31 arranged horizontally , the die 24 carrying, fixed pressing beam 32, a horizontally disposed, the punch 23 carrying, movable pressing beam 33 which is adjustable by means of at least one adjusting device, such as a fluidic pressing beam drive 34, relative to the machine frame 31 and in the direction of the fixed pressing beam 32, and an electronic control device 3.
  • the adjusting device 34 comprises a guide arrangement, by means of which the movable pressing bar 33 is guided on the machine frame 31 and an adjusting drive, which is preferably designed as a hydraulic drive, for example, but also designed as an electrically driven Hubspindelantrieb se in can. Furthermore, the adjusting device 34 comprises a displacement measuring device 35, with which the position of the movable press beam 33 with respect to the machine frame 31 and the fixed pressing beam 32 can be measured and transmitted to the control device 3.
  • a positioning device 36 is arranged in the region of the fixed press beam 32, which has numerically controlled stops for the workpieces 4 to be bent by the control device 3, so that these when inserting the correct position with respect to punch 23 and die 24.
  • the positioning device 36 is preferably arranged as a backgauge on the rear side of the pressing bars 32, 33 facing away from the operator of the bending press 2.
  • the manufacturing device 1 further comprises a handling device 37, e.g. in the form of a programmable robot arm, the movement space of which is dimensioned so as to grasp workpieces 4 individually from a supply position 39 by means of a gripping device 38, to the bending press 2, to guide the workpieces 4 to be bent during the bending operations, and to workpieces 6 bent after the bending operation Remove bending press 2 and move to a storage position, not shown.
  • the gripping device 38 brings the required holding force on the workpieces 4, 6 in the embodiment by vacuum suction, but there are also grippers used, the choice is influenced by the position of the bending edges on the workpiece 4, and the surface of the workpieces. 4
  • the production device 1 comprises at least one eddy-current measuring device 8 connected to the control device 3, on which a workpiece 4 to be bent is measured prior to the bending process or at least before the bending process is completed in order to determine an adjustment parameter value 14 of the bending press 2 based on the measured value 9 of the eddy-current measurement ,
  • an association between measured values 9 of eddy current measurements carried out on workpieces 4, produced at an earlier point in time, actual values 16 of a target variable 11 and respectively setting parameter values 14 measured on these workpieces 4 is used.
  • the eddy current measurement (see also Fig. 5 ), as already described above, is to detect the electromagnetic reaction of the workpiece 4 to a defined electromagnetic alternating field.
  • a workpiece 4 is penetrated by an electromagnetic alternating field generated by an excitation unit 21 of the eddy current measuring device 8, which is influenced by the workpiece 4, for example, in a ferromagnetic workpiece 4 by the eddy currents induced in the workpiece, which themselves cause an electromagnetic alternating field which is superimposed on the excitation field alternating.
  • a sensor unit 22 this effect of the workpiece 4 can be measured on the alternating field.
  • the exciter unit 21 and the sensor unit 22 preferably comprise coil elements with which the required magnetic field strengths for excitation or measuring sensitivities are easily realized.
  • the measured variable or measured value 9 of the eddy-current measurement is preferably the current intensity occurring in a coil element of the sensor unit 22 and the phase angle in the coil element relative to the phase angle of the exciter field, ie a reaction by an electromagnetic impedance of the workpiece 4.
  • the eddy current measurement is carried out at several, for example, at thirty different excitation frequencies of the electromagnetic alternating field to provide a meaningful relationship between measured values 9 of the eddy current measurements and to obtain the target size (s) 11 of the workpieces 4 and, if necessary, to be able to determine a further relationship between measured values 9 of the eddy current measurement and mechanical characteristics 7 of the workpieces 4.
  • the control device 3 and the setting of the setting parameter value 14 of the bending press 2 in particular the immersion depth 15 on the workpiece 4 and the bottom dead center 27 of the movement of the punch 23 or the stamp 23 on the workpiece 4 to be transmitted bending force is referenced at this point to the above description of the method.
  • An electronic evaluation device for processing the measurement results of the eddy current measurement can be included in the eddy current measuring device 8 itself, but also be formed in the control device 3, which with the magnetic field measuring device 8 via Interfaces 40 is connected.
  • the transmission of the measured values 9 or of the processed measurement results from the eddy-current measuring device 8 to the control device 3 can take place between the interfaces 40 by line connection, but also wirelessly via a transmitting and receiving device with a transmission technology such as Bluetooth, wireless LAN, infrared or the like.
  • Fig. 5 shows a view of an eddy current measuring device 8 used in the method according to the invention and in a manufacturing device 1.
  • the workpiece 4 is in the illustrated embodiment on the top of the eddy current measuring device 8 and directly above the exciter unit 21 and the sensor unit 22 contained therein.
  • the eddy current measuring device 8 at least one holding device 41 for fixing the workpieces 4.
  • This can e.g. be formed by vacuum suction 42 and / or magnets 43, which ensure the uniform and reliable contact between eddy current measuring device 8 and workpiece 4.
  • the exciting unit 21 and the sensor unit 22 can be mounted on elastically yielding or gimbals movable suspensions to the eddy current measuring device 8, which can be achieved even with thick metal blanks as a workpiece 4 a good investment.
  • the thickness measuring device 20 is arranged on the eddy current measuring device 8, whereby the two measurements are executable simultaneously, but the thickness measuring device 20 can also be arranged at a different position within the production device 1, in particular in the movement space of the handling device 37.
  • the measurement results of the eddy current measurement can be transmitted from the interface 40 via the line 40, but also additionally or alternatively via a transmitting and receiving device 44 to the interface 40 on the control device 3.
  • the transmitting and receiving device 44 can use the already mentioned above wireless transmission technologies Bluetooth, wireless LAN, infrared or the like.
  • the eddy current measuring device 8 can, as in Fig. 4 illustrated, the supply position 39 form, are provided at the workpieces 4 for the operator or a handling device 37.
  • a singulator 45 which removes a workpiece 4 from a stack and transfers them to the ready position 39.
  • the singling device 45 can comprise a device for detecting double picking, for example in the form of a thickness measurement for the singulated workpiece or a device for measuring the height of the stack or its change after removal of a workpiece 4.
  • Fig. 6 shows an example of a model 13 or its use for establishing an adjustment parameter value 14 of a bending press 2 in the form of a relationship shown in a Cartesian coordinate system.
  • the variable setting parameter 11 for example the immersion depth 15 of the punch 23
  • the target variable 11 for example the bending angle 12
  • a nominal setting parameter value 47 is required to achieve a predetermined target value 11.
  • the bending operation is not performed with this nominal setting parameter value 47, but with a measuring setting parameter value 48, in which the target size 11 still has a clear distance from the setpoint value 10.
  • a nominal actual value 49 of the target quantity 11 would result on the basis of the assumed nominal deformation characteristic 46.
  • the nominal deformation characteristic 46 only insufficiently describes the actual formability of the workpiece 4, and with the nominal setting parameter value 47 the nominal value 10 at the end of the Bending process will be missed.
  • a corrected value 50 is then determined on the basis of the measured actual value 50 obtained with the measured setting parameter value 48 Ist-Umformkennline 51 determined by means of which the corrected Einstellparameterwert 14 is determined.
  • This deviation of the actually determined formability from the originally expected formability of the workpiece can be assumed in a simplified manner as a parallel displacement of nominal deformation characteristic 46 by the data point determined from measurement setting parameter value 48 and measured actual value 50, from which the actual deformation characteristic 51 arises.
  • the actual deformability of the workpiece 4 actually determined in the form of the data point determined from the measured setting parameter value 48 and measured actual value 50 can be added to the previously used model of the bending operation and, for example after a renewed calculation of the nominal forming characteristic curve 46 for subsequent bending operations, the model 13 can be improved and adapted.

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

Claims (5)

  1. Procédé de détermination d'une valeur paramétrique de réglage (14) d'une presse à cintrer (2), dans lequel des grandeurs caractéristiques (7) d'une pièce à cintrer (4) dans un processus de cintrage sont acheminées à un dispositif de commande (3) de la presse à cintrer (2), et une valeur de consigne (10) pour une grandeur cible (11) sur la pièce cintrée (6) est acheminée au dispositif de commande (3), et au moins une valeur paramétrique de réglage (14) de la presse à cintrer (2) sous la forme d'une profondeur de pénétration (15) d'un poinçon (23) de la presse à cintrer (2) ou d'une force de cintrage devant être appliquée par le poinçon (23) sur la pièce (4, 6) ou d'un paramètre de compensation de flexion sur la presse à cintrer (2) est déterminée par le dispositif de commande (3) à partir des grandeurs caractéristiques (7) de la pièce (4) et de la valeur de consigne (10) de la grandeur cible (11) à l'aide d'un modèle (13) du processus de cintrage qui contient une relation entre la valeur paramétrique de réglage (14), les grandeurs caractéristiques (7) de la pièce (4) et une valeur de la grandeur cible (11) ainsi produite, la pièce (4) étant, avant la fin du processus de cintrage, soumise à une mesure de courants de Foucault au cours de laquelle elle est traversée par un champ alternatif électromagnétique produit au moyen d'une unité d'excitation (21) et, au moyen d'une unité de détection (22), une valeur de mesure (9) de la réaction électromagnétique de la pièce (4) sur le champ alternatif est déterminée, et une des grandeurs caractéristiques (7) est formée par la valeur de mesure (9), caractérisé en ce que, après une réalisation partielle ou complète du processus de cintrage, lors d'une décharge de la pièce (6), une valeur réelle (16) de la grandeur cible (11), en particulier l'angle de cintrage (12), est mesurée et est, dans le dispositif de commande (3), associée à la valeur de mesure (9) de la mesure de courants de Foucault ainsi qu'à la valeur paramétrique de réglage (14) agissant avant la décharge par le fait que la relation existante pour la pièce (6) actuellement cintrée entre la valeur paramétrique de réglage (14), la grandeur caractéristique (7) de la pièce (4) est déterminée sous la forme de la valeur de mesure (9) issue de la mesure de courants de Foucault et de la valeur (16) ainsi produite de la grandeur cible (11) et, sur la base de la valeur réelle (16) de la grandeur cible (11) mesurée après la décharge de la pièce (6) et sur la base de la valeur de mesure (9) de la mesure de courants de Foucault ainsi que sur la base de la valeur paramétrique de réglage (14) agissant immédiatement avant la décharge, le modèle (13) du processus de cintrage est adapté par le fait que la relation contenue dans le modèle (13) entre la valeur paramétrique de réglage (14), la grandeur caractéristique (7) de la pièce (4) sous la forme de valeur de mesure (9) issue de la mesure de courants de Foucault et la valeur (16) respectivement ainsi produite de la grandeur cible (11) est complétée par la relation déterminée sur la pièce (6) actuellement cintrée.
  2. Procédé selon la revendication 1, caractérisé en ce qu'au moins une grandeur caractéristique (7) de la pièce (4), sélectionnée parmi un groupe comprenant l'épaisseur de pièce, le poids ou la surface de pièce, est déterminée par une mesure avant et pendant le processus de cintrage et est utilisée conjointement avec la valeur de consigne (10) par le dispositif de commande (3) avec utilisation du modèle (13) du processus de cintrage lors de l'établissement de la valeur paramétrique de réglage (14).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la mesure de courants de Foucault est réduite largement à des zones dans la pièce (4) qui sont déformées lors du processus de cintrage.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'une relation, contenue dans le modèle (13) du processus de cintrage, entre la valeur paramétrique de réglage (14), la grandeur caractéristique (7) de la pièce (4) sous la forme de la valeur de mesure (9) issue de la mesure de courants de Foucault et la valeur réelle (16) respectivement ainsi produite de la grandeur cible (11) est déterminée à l'aide d'un calcul de régression et/ou d'un calcul de corrélation issu de valeurs de mesure (9) de mesures antérieures de courant de Foucault sur plusieurs pièces (4, 6) et de valeurs réelles (16) de la grandeur cible (11) mesurées sur la pièce (6) respective.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la valeur de mesure (9) de la mesure de courants de Foucault ou la valeur, qui en est dérivée, d'une grandeur caractéristique (7) de la pièce (4) est mise en place sur la pièce (4), en particulier sous une forme lisible par une machine.
EP08714301.2A 2007-03-30 2008-03-25 Procédé de détermination d'une valeur paramétrique de réglage d'une presse à cintrer Active EP2134483B1 (fr)

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AT0049807A AT505743B1 (de) 2007-03-30 2007-03-30 Verfahren zur festlegung eines einstellparameterwerts einer biegepresse
PCT/AT2008/000104 WO2008119090A1 (fr) 2007-03-30 2008-03-25 Procédé de détermination d'une valeur paramétrique de réglage d'une presse à cintrer

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WO2008119090A1 (fr) 2008-10-09
AT505743A1 (de) 2009-03-15
AT505743B1 (de) 2009-07-15
EP2134483A1 (fr) 2009-12-23

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