EP2134483A1 - 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

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Publication number
EP2134483A1
EP2134483A1 EP08714301A EP08714301A EP2134483A1 EP 2134483 A1 EP2134483 A1 EP 2134483A1 EP 08714301 A EP08714301 A EP 08714301A EP 08714301 A EP08714301 A EP 08714301A EP 2134483 A1 EP2134483 A1 EP 2134483A1
Authority
EP
European Patent Office
Prior art keywords
bending
workpiece
value
eddy current
measured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08714301A
Other languages
German (de)
English (en)
Other versions
EP2134483B1 (fr
Inventor
Burkhard Heller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trumpf Maschinen Austria GmbH and Co KG
Original Assignee
Trumpf Maschinen Austria GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Trumpf Maschinen Austria GmbH and Co KG filed Critical Trumpf Maschinen Austria GmbH and Co KG
Publication of EP2134483A1 publication Critical patent/EP2134483A1/fr
Application granted granted Critical
Publication of EP2134483B1 publication Critical patent/EP2134483B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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 establishing an adjustment parameter value of a bending press according to the preamble of claims 1, 8 and 11 and to a production device according to the preamble of claim 25, in particular suitable for carrying out the method according to the invention.
  • 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 adjust the correction value for setting the bottom dead center of the punch movement or the bending force to be applied on the basis of the measured deviation from the setpoint angle, or programmed correction values in the machine control be used for post bending. 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 difference in thickness between the real thickness of a workpiece and the nominal thickness of a workpiece is calculated by the actual position of the movement of the punch, in which there is a predetermined change of a Parameters, eg of the pressure at the pressing cylinders is compared with the theoretical position of said movement, in which it should come to this change of the parameter. Further, during the bending operation by an electronic control device, the measured values of the movement of the punch and the parameter, e.g. the pressure of the pressing cylinder, processed during the phase of plastic deformation of the just bent workpiece.
  • Measurement data are compared during the bending process with the data of a reference bending process, in which the target bending angle was achieved, and calculated for deviations from the electronic control device, a correction value for the bottom dead center of the movement of the punch.
  • the disadvantage of this method is that the determination of the Umformkraft-Umformweg- course, for example, by vibrations in the drive system of the press bar or unpredictable slip-stick effects between the press tool and workpiece is fraught with 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 press ram and scans the force acting on the workpiece, can detect deviations from a model formed by measurements based on curved test workpieces and optionally correction values for determines the stamp movement.
  • 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 is known in which a measured variable, which is detected by a measuring sensor of a measuring device arranged in front of the wire transducer, can influence the wire-forming machine in order to keep the geometry of produced springs within 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 method for adapting the parameters of a forming process to the actual properties of the starting material, using a vortex Current / induction measurement method, the formability or the deformation behavior of the starting material is determined. It also correlations between electromagnetic and mechanical-technological properties of the starting material are used. For example, 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, if appropriate, can be subsequently introduced on existing systems with only minor structural measures.
  • This object of the invention is achieved by a method with the measures of the characterizing part of claim 1.
  • 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 determination of the setting parameter value takes place before the actual bending process, whereby it can be carried out at full speed and without interruption.
  • the invention makes use of the insight that the electromagnetic properties of a workpiece accessible via the eddy current measurement with geometrically and / or mechanically technological workpiece properties, such as, for example, Sheet thickness, yield strength,
  • Tensile strength, uniformity, modulus of elasticity, solidification exponent or rolling direction of the workpiece correlate and the electromagnetic properties can therefore be used as a parameter of the workpiece for a determination of a Einstellparameterhongs for a bending operation. From a deviation of the measurement result of the vortex flow measurement from a nominal value, it is possible to deduce a corresponding deviation of a mechanical parameter from a nominal value and thereby to correct the setting parameter value with respect to a nominal setting value.
  • the measurement of the actual value of the target variable can be carried out in particular even after a relief of the workpiece before complete completion of the bending process, ie at an intermediate relief.
  • the bending process at a Bending angle of about 100 ° 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.
  • the method is not limited to the determination of a single of these adjustment parameters, but also several as well as others Setting parameter values can be set.
  • 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 the purpose of 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 settings, taking into account the deviation of the workpiece from the nominal deformability originally assumed, characterized by nominal values of the workpiece characteristics, by the actual value of the target variable very close to 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.
  • a further advantageous variant of the method consists in adapting the model of the bending process 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 Measured value of the eddy current measurement possibly further known or determined characteristic of the workpiece and the immediately before the relief acting setting parameter value in the control device are stored in the form of a data set.
  • 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 that were 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.
  • the object of the invention is also achieved by a method with the measures of independent claim 8, according to which an estimated value 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 the setting of 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 estimate is based on a model
  • the material properties which include a correlation between the measurement result of the eddy current measurement and mechanical-technological parameters of the workpiece, for example, come from series of tests of material testing in which the results of non-destructive eddy current measurement with results of destructive testing methods of mechanical material properties are related.
  • 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.
  • a nominal value of the material parameter for example, the thickness as the geometrical parameter of the workpiece or the proportionality limit RpO, 2 as the mechanical-technological parameter of the workpiece are 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 results of eddy current measurements and the mechanical characteristics can be determined, for example, by eddy current measurements and subsequent destructive or non-destructive material testing on Probewerk Workshopen.
  • 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 can 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.
  • the object of the invention is further achieved by a method with the measures of independent claim 11, according to which during the bending process a course of a bending force or directly related to this Biegekraftpara- meters, for example, acting in the press beam drive hydraulic pressure, and the control device is fed, wherein the bending force, the bending force parameter or a calculated from the course calculation of a mechanical characteristic of the workpiece selected from a group comprising yield strength, Proportion Rundssky, elongation at break, uniform strain, elastic modulus as a parameter used to reestablish the Einstellparameterwerts before completion of the bending process becomes.
  • the respective measured bending force can for example be used directly without calculation of mechanical-technological characteristics of the workpiece to one or more set based on the measured value of the eddy current measurement Einstellparameterute for example, in determining a deflection parameter value which is used to adapt the curvature of the lower tool or of the fixed press beam to the deflection of the movable press beam occurring with each bending force exerted.
  • the deformation can be adjusted by actively changing its curvature at the fixed pressing bar, z.
  • Contacting the still unbent workpiece or the immersion depth is preferably removed by means of displacement sensors 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.
  • the calculated value of the workpiece parameter is linked to the estimated parameter of the workpiece parameter in order to determine the setting parameter value.
  • the tax Direction can calculate the link in particular by a weighted average, depending on the choice of weights, the validity of the eddy current measurement or Umformkrafttul 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 thickness of the workpiece as well as mechanical-technological material characteristics directly influence the target size, e.g. has the bending angle
  • As a method for thickness measurement all measuring 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.
  • the thickness measurement can be limited to those sections of the workpiece that are mechanically stressed during the bending process.
  • 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. There- 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 also the reaction to the sensor unit is strongly dependent on the excitation frequency of the electromagnetic alternating field and depending on the microstructural properties and thus also the mechanical technological properties of the workpiece at different excitation frequencies for each
  • Material type results in a typical electromagnetic reaction on 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.
  • at least ten, preferably twenty to thirty different exciter frequencies a wide frequency spectrum can be covered and the
  • 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. For this purpose, the flowing in the sensor coil
  • the electromagnetic properties of the material of the workpiece can be deduced. 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 size used is a geometric parameter obtained on the workpiece selected from a group comprising bending angle, side length, radius of curvature at the bending zone, parallelism or crowning of the workpiece after the bending process.
  • 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 backpropagation process from results of a sequence of bending operations.
  • the aid of 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 made with the aid of Fuzzy logic control can be used to determine the required corrections in the determination of the setting parameter value to deviations in the characteristics of the workpiece over the values in one or more bending operations on specimens.
  • 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 is advantageous with the electronic control device carried out.
  • the electronic control devices used on modern bending presses offer in many cases sufficient memory and computing power to perform the required 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.
  • a further object of the invention is to provide a production device for bending, with which a sufficiently precise bending angle of workpieces to be bent is achieved already during the first bending operation.
  • the surprising advantage of this production device is that the Wirbelstrommesseinrichrung coupled to an electronic control device of a bending press can be spatially arbitrarily arranged and automatically taken over the results of the eddy current measurement on a workpiece to be bent by the electronic control device of the bending press and by estimating the forming properties by an eddy current measurement and based on fixing a setting parameter value of the bending press, the angular accuracy of the bending press is increased.
  • the eddy current measuring device may be located away from the bending press, e.g. in the area of an upstream laser cutting machine, in which the process-related lying time for the eddy current measurement is used.
  • the eddy current measuring device may be located away from the bending press, e.g. in the area of an upstream laser cutting machine, in which the process-related lying time for the eddy current measurement is used.
  • 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.
  • these are two separate elements which, in addition, may be largely shielded from one another electromagnetically, whereby the sensor unit essentially only picks up or measures the electromagnetic alternating field influenced by a workpiece.
  • the excitation unit and the sensor unit it is also possible for the excitation unit and the sensor unit to be formed by one and the same element.
  • 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 this form 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 invention is according to another claim in that the eddy current measuring device is arranged in the region of the machine frame, the fixed beam, a positioning device or a depositing station for workpieces.
  • This arrangement in the immediate area of the bending press provides short paths for the operator of the machine as well as for the workpieces and also 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 for measuring the bending force exerted on the workpiece by the bending tools
  • 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.
  • 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 repeat accuracy, as well as a slim, space-saving design, so that even small workpieces reliably detected by the gripping device and can be brought to the bending tool.
  • 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 production device is equipped with a handling device
  • the eddy current measuring device may also be expedient, according to another claim, 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.
  • a positioning which is the same for all workpieces with respect to the exciter unit and sensor unit is ensured. and random measurement errors, eg by fluctuating air gaps between the workpiece and eddy current measuring device are avoided.
  • the production device in particular the eddy-current measuring device, comprises a thickness measuring device.
  • the thickness measuring device can take place simultaneously with the eddy current measurement, if the thickness measuring device is structurally connected to the magnetic field measuring device.
  • the eddy-current measuring device may be advantageous to couple the eddy-current measuring device with a separating device for workpieces to be bent, provided in stacks.
  • a separating device for workpieces to be bent, provided in stacks.
  • the separating device can also be equipped with a device for detecting double withdrawals.
  • 1 shows a simplified, schematic illustration of the method according to the invention for determining an adjustment parameter value
  • 2 shows a simplified flow chart of the method for determining a setting parameter value with two method variants
  • FIG. 4 shows a simplified view of a production device according to the invention
  • FIG. 5 shows a view of an eddy-current measuring device used in the method according to the invention and in a production device according to the invention with a workpiece to be measured in a simplified, schematic representation;
  • Fig. 1 shows schematically 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 an immersion 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 bending press 2 such as an immersion depth of a bending punch or a bending force exerted on the workpiece 4.
  • 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 to define one or more setting parameter values in order to approximate one or more actual values of target variables on the bent workpiece 6 as closely as possible to predetermined set values.
  • 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 below.
  • 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 setpoint 10 of the bending angle 12 before represents the bending process only a desired state of the bent workpiece 6, this is shown in the control device 3 information 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 variable 11, for example of the bending angle 12 is effected on the bent workpiece 6, then the actual value 16 is measured and supplied 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.
  • a correlation of the measured value 9 of the eddy current measurement, of the setting parameter 14 effective immediately before the relief of the bent workpiece 6 and of the actual value 16 of the target 11 on the bent workpiece 6 takes place, in the exemplary embodiment therefore a combination of measured value 9 of the eddy current measurement
  • the linkage can consist, for example, in merging these values into a data record which maps a relationship between these three values and is used as information about the forming behavior of the workpiece 4, 6 can.
  • FIG. 2 shows the sequence of the method according to the invention even more precisely 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 hardware and software usually contained, 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 forming process with the bending press 3 in the form of software and data.
  • the model 13 is shown 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, however, such information is always associated with a fuzziness, since the cost of the exact determination would be much too high for each workpiece, and therefore always assume a nominal value 17 with a probable range of variation.
  • 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 measured 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 AC current flows and a sensor unit 22 with a sensor coil exposed to the alternating field and is provided with an electronic evaluation device for measuring at least the currents occurring in the sensor coil according to amplitude and phase position or Phase angle and processing of Messsig- signals connected to further processed readings 9, which can be arranged directly in the eddy current measuring device 8, but also other assemblies of the manufacturing device 1 can be assigned.
  • a sensor coil it is also possible to provide 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 change in the impedance of the sensor coil based on the change in amplitude and phase of the alternating current in the sensor coil by the reaction of the workpiece 4 against an initial state of the alternating electromagnetic field without workpiece 4 is used.
  • 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 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.
  • adjustment parameter value 14 which influences and determines the achieved bending angle 12, in this exemplary embodiment a certain insertion depth 15, ie the deformation away between the first contact point 26 between punch 23 and workpiece 4 and bottom dead center 27 is selected.
  • the bending force applied by the punch 23 to the workpiece 4, 6 at the end of the deformation can also be used as the setting parameter value 14 since, like the insertion depth 15, this directly influences the bending angle 12 achieved after the bending process has been carried out, since the punch 23 with higher bending force, continue into the die 24 penetrates and the workpiece 4, 6 is correspondingly more deformed.
  • the setting of the setting parameter value 14 -in this case the immersion depth 15, which causes the achievement of a specific bending angle 12 - is effected according to the invention as follows:
  • the result of the eddy current measurement on a workpiece 4 is taken from the eddy current measuring device 8 by the control device 3 and between results of eddy current measurements previously performed on other workpieces 4 and respectively known setting parameter values 14 - in this case dipping depths 15 - achieved actual values 16 of the target size 11, in this case bending angles 12 a Einstellparameterwert 14 to achieve the desired target value 10 of the target size 11, determined in the example of the bending angle 12 of the workpiece 4 to be bent. Due to the known correlation between electromagnetic properties and mechanical-technological properties such. Modulus of elasticity and yield strength
  • Elongation limit of metallic materials is also a correlation between the measured values 9 of the eddy current measurements, the used Einstellparameterwert 14 and the achievable bending angle 12th
  • 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.
  • the actual value 16 of the target 11, measured in the example of the bending angle 12 is also supplied to the control device 3 and in this with the measured value after performing a bending operation, either after complete completion or at an intermediate relief on curved workpiece 6 9 of the eddy current measurement as well as the effective immediately before the discharge of the bent workpiece 6 on the bending press 2 setting parameter value 14 linked.
  • the linkage can also be to adapt the model 13 of the forming operation to the eddy current measurement on the basis of the actual value 16, the immediately before the relief effective setting parameter value 14 and the measured value 9 these values will be added to from previous bends or an assumed relationship between 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 vortex 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 can be carried out even more economically. 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 of previously performed bending processes are stored together with the respective adjustment parameter values in data records from which the model 13 is determined by regression calculation and / or correlation calculation and used to determine the adjustment 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, that is trained with the use of a back-propagation process in such a way that the measured parameter value 14 can be determined by the electronic control and monitoring device 3 from measured values 9 of an eddy-current measurement.
  • a modification of the previously described method for determining a setting parameter value 14 is to detect a bending force profile 28 during the bending process - shown in dashed lines in FIG. 2, whereby information about the forming behavior of the workpiece 4, 6 can likewise be obtained .
  • the measure to further increase the bending angle accuracy thereby consists in detecting the course of the bending force as a function of the workpiece deformation during the bending process and from this a calculated value of a mechanical parameter 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 may e.g.
  • This information about the deformation 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 higher 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 obtained directly from the bending process can be used to modify the relationship between measured values 9 of eddy current measurements and the target variable 11, ie the method can be designed to be self-learning by evaluating the individual bending processes.
  • the actually achieved bending angle 12 is after measured 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 size 11 - the bending angle 11 - added.
  • an adjustment parameter value 14 which uses an alternative use of the measured values 9 of the eddy current measurement in comparison to the previously described methods.
  • 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 estimated value 29 is calculated in
  • FIG. 4 shows a production device 1 for the angularly accurate 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 freeing 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, a machine frame 31 on the ho arranged horizontally, the die 24 carrying, fixed pressing beam 32, a horizontally disposed, the punch 23 carrying, movable pressing beam 33, 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 press beam 32.
  • the adjusting device 34 comprises a guide arrangement, by means of which the movable pressing beam 33 is guided on the machine frame 31 and an adjusting drive, which is preferably designed as a hydraulic drive, but also designed as an electrically driven Hubspindelantrieb 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 press 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 back stop, 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 accessory produced at a previous time and contained in a model 13 of the bending process is determined. Relationship between measured values 9 of eddy current measurements carried out on workpieces 4, actual values 16 of a target variable 11 measured on these workpieces 4 and adjustment parameter values 14 used in the process are used.
  • the eddy-current measurement (see also FIG. 5) consists in detecting the electromagnetic reaction of the workpiece 4 to a defined electromagnetic alternating field.
  • a workpiece 4 is penetrated by an alternating electromagnetic field generated by an exciter unit 21 of the eddy current measuring device 8, which is influenced by the workpiece 4, e.g. in the case of a ferromagnetic workpiece 4 by the eddy currents induced in the workpiece, which themselves cause an electromagnetic alternating field which is superimposed on the exciter alternating field.
  • a sensor unit 22 this effect of the workpiece 4 can be measured on the alternating field.
  • the excitation unit 21 and the sensor unit 22 preferably comprise coil elements with which the required magnetic field strengths for excitation or measurement 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 possibly 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 For establishing the relationship by means of the magnetic field measuring device 8, the control Device 3, as well as the determination 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 and the bending force to be transmitted from the punch 23 to the workpiece 4 at this point to the referenced above description of the method.
  • An electronic evaluation device for processing the measurement results of the eddy current measurement may be contained in the eddy current measuring device 8 itself, but may also be formed in the control device 3, which is connected to the magnetic field measuring device 8 via interfaces 40.
  • 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 be conducted between the interfaces 40 in a wired manner, but also wirelessly via a transmitting and receiving device with a transmission technology such as transmission. Bluetooth, wireless LAN, infrared or similar.
  • FIG. 5 shows a view of an eddy-current measuring device 8 used in the method according to the invention and in a production device 1 according to the invention.
  • 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 can be carried out simultaneously, but the thickness measuring device 20 can also be at a different position within the Manufacturing device 1, in particular be arranged in the movement space of the handling device 37.
  • FIG. 5 further shows that 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 form the provisioning position 39 on which workpieces 4 for the operator or a handling device 37 are provided.
  • a singulator 45 which removes a workpiece 4 from a stack and transfers them to the ready position 39.
  • the singulator 45 may comprise means for detecting double picks, e.g. in the form of a thickness measurement for the separated 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 defining an adjustment parameter value 14 of a bending press 2 in the form of a relationship represented 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 process is not performed with this nominal setting parameter value 47, but instead with a measuring setting parameter value 48 in which the target variable 11 still has a clear distance from the setpoint value 10.
  • a corrected actual forming characteristic 51 is now determined on the basis of the measured actual value 50 obtained with the measured setting parameter value 48 Help of which the corrected setting parameter value 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 measured data parameter 48 and actual measured value 50 can be added to the previously used model of the bending operation and at - For example, after a new calculation of the nominal forming characteristic 46 for subsequent bending operations into account and the model 13 improved and adapted.
  • the exemplary embodiments show possible embodiments of the method for determining a setting value of a bending press for a bending operation on an electrically conductive workpiece and a production device for bending conductive workpieces. It should be noted at this point that the invention is not limited to the specifically illustrated embodiments of the same, but also various combinations of the individual variants with each other are possible and this possibility of variation due to the doctrine of technical action by representational PHg in the skill of skilled in the art. There are therefore also all possible embodiments, which are possible by combinations of individual details of the illustrated and described embodiment, the scope of protection.
  • FIGS. 5 and 6 form the subject of independent solutions according to the invention.
  • the relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures.

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

Abstract

L'invention concerne un procédé de détermination d'une valeur paramétrique (14) d'une presse à cintrer (2), procédé consistant à déterminer, par un dispositif de commande (3) à partir d'au moins un paramètre (7) d'une pièce à cintrer (4), lors d'un processus de cintrage, et d'une valeur de consigne (10) pour une grandeur cible (11) sur la pièce cintrée (6), au moyen d'un modèle (13) de processus de cintrage, au moins une valeur paramètrique de réglage (14) de la presse à cintrer (2), en particulier une profondeur de pénétration (15) d'un poinçon (23) de la presse à cintrer (2), un paramètre (7) étant formé par la réaction électromagnétique de la pièce (4) sur un champ électromagnétique alternatif traversant la pièce (4), généré par une unité d'excitation (21), réaction déterminée, en tant que valeur mesurée (9), par mesure de courants de Foucault au moyen d'une unité de détection (22). Une fois le cintrage exécuté partiellement ou complètement, et à la décharge de la pièce (6), une valeur réelle (16) de la grandeur cible (11), en particulier de l'angle de cintrage (12), est mesurée et combinée avec la valeur mesurée (9) par mesure des courants de Foucault, et avec la valeur paramétrique de réglage (14) agissant avant décharge de la pièce.
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)

Applications Claiming Priority (2)

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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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AT505743A1 (de) 2009-03-15
EP2134483B1 (fr) 2017-08-02
AT505743B1 (de) 2009-07-15

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