EP1098722B1 - Verbesserte präzisionsbiegepresse - Google Patents

Verbesserte präzisionsbiegepresse Download PDF

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Publication number
EP1098722B1
EP1098722B1 EP00951644A EP00951644A EP1098722B1 EP 1098722 B1 EP1098722 B1 EP 1098722B1 EP 00951644 A EP00951644 A EP 00951644A EP 00951644 A EP00951644 A EP 00951644A EP 1098722 B1 EP1098722 B1 EP 1098722B1
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EP
European Patent Office
Prior art keywords
angle
data
conditions
penetration depth
numerical control
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.)
Expired - Lifetime
Application number
EP00951644A
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English (en)
French (fr)
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EP1098722A1 (de
Inventor
Brahim Chebbi
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.)
Amada Europe SA
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Amada Europe SA
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Publication date
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Publication of EP1098722A1 publication Critical patent/EP1098722A1/de
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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
    • B21D5/006—Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S72/00—Metal deforming
    • Y10S72/702—Overbending to compensate for springback

Definitions

  • the invention relates to a press brake used in particularly for folding metal sheets.
  • the latter includes an upper deck 1 arranged above a lower deck 2.
  • the latter is fixed, bearing at its ends, while the upper deck 1 is movable, and actuated in a plane vertical by drive members also located at its two ends.
  • the decks 1, 2 are mounted in a frame formed by two flanges 9a and 9b joined together in particular by a bracing beam (not shown).
  • the upper 1 and lower 2 aprons are contained in the same vertical plane and the upper apron slides relative to the flanges 9a and 9b using guide means 8a and 8b formed for example by two hydraulic cylinders.
  • the lower part 4 of the lower deck 2 is fixed by welding or by any other means to its ends to the flanges 9a and 9b forming the press frame folder.
  • Figure 3 shows a sheet 10 placed on the matrix M in which a "V" is made which will allow folding.
  • a force F is exerted to flex the sheet.
  • the bending angle of a metal sheet or sheet depends the importance of the penetration of the punch P inside the matrix M.
  • a press brake can, in general, perform three types folding.
  • This type of folding is obtained by limiting the travel of the apron 1 when adjusting the machine.
  • the shape of the matrix is of little importance. It can also be a U.
  • a method to help with folding with optimal precision is to use a protractor 16, mounted as illustrated in FIG. 6: the sheet 10 can rest on branch 18 of the protractor, itself mounted on the matrix M.
  • the angular precision obtained with this type of folding may be at best 15 minutes of angle.
  • Document JP-60 - 247,415 describes a press brake provided with means for measuring distances between a lower tool and a superior tool, and a calculating means for calculating an angle of effective folding of a part according to distance measurements performed. The effective folding angle is compared with the angle of bending to be achieved, and a correction of the lowering of the tool is determined.
  • a memory stores information concerning the relationship between the effective and target bending angles and the angles of bending and the level of descent of the tool.
  • the device described in this document involves a step of calculating the effective angle, from measured distances, and determines a correction on the descent of the tool based on these distances measured.
  • this method does not distinguish according to the different types of folding performed. Now an angle calculated for a distance measured and for a given type of bending is not necessarily valid, or does not necessarily have the same type precision, for another type of folding.
  • WO 99/14641 describes a folding process using a neural network.
  • Document DE-3,441 13 describes a device in which angle data is entered into the numerical control, a folding is carried out, then a measurement of the angle obtained is carried out. This measurement is compared to the desired angle value.
  • the document also describes a device with bending angle measurement in real time, during the folding, until the desired angle is obtained. Once a certain folding performed, the angle obtained is compared with the desired angle, and a new folding is performed, if the difference between the two values of angles is too important.
  • control device or system when bending conditions and an angle desired, indicated by an operator, exist in the database data, the control device or system returns the value of penetration, stored in the storage means, which corresponds to these folding conditions and desired angle.
  • the value of the penetration depth does not depend no longer just a single variable such as the distance between lower and upper parts of the press.
  • the device is particularly interesting for three-point folds in the air or V-folds in the air (semi-striking technique). It is indeed in these modes of bends that the precision problems arise with the most acute.
  • the device order can also include means to find out if two groups of data exist in the storage means having the same folding conditions as those introduced by the insertion means, and respective folding angles between which the desired angle is understood, and to calculate a penetration depth as a function of the depths of penetration belonging respectively to the two groups of data.
  • the calculation of the penetration depth can consist for example in an interpolation of penetration depths contained in the two data groups.
  • means can make it possible to modify, in the storage means, at least one parameter among the folding conditions, the folding angles and the penetration depths.
  • the operator is not limited to the stored values in the storage means.
  • means are also provided for perform a comparison of a measured bending angle and the angle desired fold, and means for correcting the depth of penetration if it results from the comparison that the angle measured is different from the desired angle.
  • means make it possible to update data in the storage means in depending on the result of the penetration depth correction.
  • Other means can be provided for writing in the means of storage an additional group of data, comprising input data and corrected penetration depth. These last means are used when the input data was not not already present in the same data group stored in the means of memorization.
  • the device according to the invention thus has a base of scalable, or dynamic, data that provides precision increased as it is used.
  • the invention also relates to a press system folder comprising a control system as described above.
  • FIG. 7A schematically represents a system of press brake 20 implementing a method according to the invention.
  • This system comprises two upper and lower aprons 1, 2, of the type of those described above in relation to Figures 1 and 2, a digital control system 22 which controls cylinders hydraulic 8a, 8b for moving the deck 1 relative to apron 2, and a digital protractor 21 used to measure angles obtained after folding.
  • a terminal comprising a PC-type microcomputer, a display screen 25 and a keyboard 27 can also be connected to the digital control device 22 by a link wired, for example RS232 type. This terminal allows to execute bending simulation programs.
  • the digital control system 22 includes a display screen 24 and a keyboard 26 allowing an operator to enter data or indications relating to an angle at reach and / or folding or use conditions such as explained below in more detail. It also includes a processor 32, which in particular implements algorithms for calculation and management of the numerical control which will be described further on, an interface 30 used to read digital data transmitted by the digital reporter 21 via a cable 21a, and storage means, or memory area, 34.
  • Table I shows three groups of data G1, G2 and G3 stored in the database.
  • content of the database G1 G2 G3 G4 G5 G6
  • Matrix angle 90 90 90 Matrix radius 0.20 0.20 0.20 Matrix width 10
  • Punch angle 90 90 90 Punch radius 0.2 0.2 0.2 Workpiece thickness 1 1 1
  • Material type Steel Steel Steel Material resistance 40 40
  • Folding length 1,000 1,000 Workpiece offset 0 0 0 Folding angle 90 120 135
  • Initial Y2 penetration - 2.26 - 1.55 - 1.11 CO1 correction - 0.05 - 0.12 0.08 CO2 correction - 0.05 - 0.12 0.08
  • Each data group G1 to GN contains data representative of bending conditions, a value of one folding angle and penetration depth values, say also updated penetration depth values or corrected.
  • Penetration depth values are broken down into initial penetration values Y1 and Y2 and values of corresponding correction CO1 and CO2.
  • Each depth of penetration (update) is equal to the sum of the value of initial penetration Y1, Y2 and the corresponding correction CO1, CO2.
  • Each penetration depth Y1 + CO1, Y2 + CO2 is associated with a hydraulic axis of the press brake. More specifically, the values Y1 + CO1 and Y2 + CO2 are representative displacement of the punch in the V of the matrix which must perform respectively the cylinders 8a, 8b shown in Figure 7A to get the folding angle.
  • Data groups G1 to GN can be previously stored in the database above all operation, by the manufacturer or a user.
  • the base of data may subsequently be modified or supplemented by the user, via the keyboard 26 and the screen 24. It can also be modified or supplemented by the digital control system 22 when executing a correction mode, which will be described in detail in the following.
  • the initial penetration values Y1, Y2 are generally values which have been previously obtained by calculation or by interpolation, for example from conditions of folding and a desired folding angle provided to the numerical control 22 by the operator, during the execution of a programming mode which will also be described below in detail.
  • the correction values CO1, CO2, when they are non-zero, are values that have been previously obtained when executing the aforementioned correction mode.
  • Figure 7B schematically illustrates the different operating modes of the press brake system according to the invention.
  • the operator can select programming mode 81, correction mode 82, a production mode 83 or a display mode 84.
  • the operator can program a part to bend. To do this, it enters conditions folding angle and desired folding angle in the numerical control 22, via the keyboard 26.
  • the folding conditions entered by the operator must be the same type than those stored in the database (criteria of the die, punch, coin and fold).
  • System 22 determines then, for each hydraulic axis, a penetration value Y1, Y2 to obtain the desired folding angle.
  • Figure 9 shows the algorithm implemented by the digital control system 22, and more particularly by its processor 32, during the execution of the programming mode.
  • a step 100 the digital control system 22 reads the folding conditions and the value ⁇ of the desired folding angle entered by the operator via the keyboard 26.
  • control system digital 22 queries the database, contained in the storage means 34, to check whether there is, in this base of data, a group of data having the same conditions of folding and the same folding angle as those entered by the operator.
  • the depth of penetration included in the group equal to the sum of the depth value initial penetration and the corresponding correction, for each axis, is selected as penetration depth to be implemented and displayed on the display screen 24 (step 104).
  • the operator can then request the control system numeric 22, via keyboard 26, to send an order or a signal to the press brake 1-2-8a-8b, in order to make it execute folding with this depth of penetration. Folding is performed under the action of hydraulic cylinders 8a, 8b which move the deck higher 1 along a distance to reach this penetration depth.
  • step 110 is implemented by performing a interpolation not on the folding angle, but on one of the folding conditions, such as the thickness of the workpiece.
  • step 106 may consist in carrying out a first searches the database to determine if two GR1 and GR2 data groups of the type described previously (with ⁇ 1 ⁇ ⁇ 2) are present and, if such groups are not found, do a second search for determine whether two data groups GR1 'and GR2' (with e1 ⁇ e ⁇ e2) are present. So, in case the system of numerical control 22 does not find groups GR1, GR2, but finds two groups GR1 'and GR2', it performs an interpolation on the thickness of the part.
  • the penetration depth value p calculated at step 110 or 112 is displayed on the display screen 24, and the operator can, as described above for step 104, do perform folding based on this value.
  • Correction mode designated by the reference 82 in the figure 7B, corrects the penetration depth determined by the digital control system 22 during the execution of the mode programming, when the operator, after requesting the making a fold from this penetration depth, is not satisfied with the angle actually obtained.
  • the operator can, as has already been explained, ask the digital control system 22 to controls the folding machine 1-2-8a-8b depending on the value of penetration depth determined by the control system numeric 22. The operator can then measure the angle of the fold as performed, to check if this angle corresponds to the angle ⁇ that it had programmed.
  • Such a measurement can be carried out with a tool or a traditional reporter of the type described above in relation to the figure 6.
  • the operator enters, via the keyboard 26, the angle measured in digital control system 22, which compares the angle programmed and the angle measured. If these two angles are different, the numerical control system 22 determines a value of correction for penetration depth depending on the angle difference, in a manner known to those skilled in the art, in using a predetermined formula, such as formula (1) described previously. More specifically, the formula is applied to the angle programmed, to obtain a first penetration depth; the same formula is then applied to the measured angle, for get a second depth of penetration. The value of correction then corresponds to the difference between the first and second penetration depths. The operator can then do perform a fold from the corrected penetration depth, equal to the sum of the initial penetration depth and the calculated correction value.
  • the system 22 further modifies the database to to take into account the correction made. If the folding conditions and the folding angle entered by the operator in the numerical control 22 when executing the mode programming were already stored in the database, in the same data group, with a depth value initial penetration and a corresponding correction value (which is equal to zero if no correction had already been made on the penetration depth value corresponding to said folding conditions and folding angle), the control system numeric 22 changes the correction value in the database data.
  • the system of numerical control 22 introduced into the database a additional data group, including the conditions of folding, the folding angle, the initial depth value of penetration (as determined by interpolation or the formula preset during the execution of the programming mode), and the value correction.
  • the reporter digital 21 is used in place of the aforementioned traditional reporter to measure the angle obtained.
  • FIG. 10 shows in detail the digital reporter 21. This protractor allows you to measure the angle of a part in the way next.
  • a part 40 is wedged on a first support element 42, appearing for example in the form of an L, and against a flat face 44 of an element 46 pivoting about an axis of rotation 48.
  • An angle indicator 50 displays the angles of rotation of the pivoting part 46.
  • a graduated ruler 52 is marked on the circumference of the pivoting element 46.
  • a detector 54 makes it possible to read the value of rule 46 at a certain fixed point relative to the case 58 of the part.
  • the detector 54 sends the measurement signals to a interface 60, which comprises (FIG. 11) a central unit 62 including a ROM memory 64, a RAM memory 66 and means for switching 68 (for locating an origin), 70 (for recording), and 72 (general switching).
  • the reference 50 represents, as in FIG. 10, a screen for viewing the data.
  • Means 74 also make it possible to transmit signals corresponding to the measurements made, towards the interface 30 of the digital control system 22.
  • the digital protractor can be previously calibrated by the operator. To this end, the operator activates a calibration mode. A calibration page appears on screen 24 of the control digital 22.
  • the calibration mode is activated automatically by digital control system 22 when, when launching a correction mode automatic, a quality control mode or a display, which will be described later, the system 22 goes account that the calibration has not been carried out.
  • the pivoting element 46 is brought, by example manually, in a position chosen as position of reference for an angle of 180 °.
  • the operator validates the choice of this position by acting on the switching means 68.
  • the display screen 50 or the console 24 then displays a value 180 ° angle.
  • the operator ends the calibration phase.
  • correction mode 82 When the operator activates, in correction mode 82, a function, or a so-called automatic correction mode, designated by the reference 85 in FIG. 7B, the value of the angle measured by the digital recorder 21 is read by the control system numeric 22, which then compares the programmed angle and the angle measured, and determines a correction value for the depth of penetration as a function of the angle difference.
  • the determination of the correction value is performed in the same way as described above in relation to the correction mode, that is to say in applying a preset formula at the programmed angle, applying this same formula to the measured angle, and calculating the difference between the two penetration depths thus obtained.
  • the system 22 further modifies the database to to take into account the correction made. If the folding conditions and the folding angle entered by the operator in the numerical control 22 when executing the mode programming were already stored in the database, in the same data group, with a depth value initial penetration and a corresponding correction value (which is equal to zero if no correction had already been made on the penetration depth value corresponding to said folding conditions and folding angle), the control system numeric 22 changes the correction value in the database data.
  • the system of numerical control 22 introduced into the database a additional data group, including the conditions of folding, the folding angle, the initial depth value of penetration (as determined by interpolation or the formula preset during the execution of the programming mode), and the value correction.
  • the database according to the invention is therefore dynamic, that is to say that it can be supplemented as and when measurement of the use of the press brake system.
  • Figure 12 illustrates in detail the algorithm implemented by the digital control system 22 during the execution of the automatic correction mode.
  • a display is made of the programmed angle.
  • One or two values of are then displayed (step 162) penetration Y1, Y2 and one or two correction values of the penetration (see Figure 15), depending on the number of axes hydraulics provided on the bending machine 1-2-8a-8b. Values of correction are null if no correction had previously been performed on penetration depths.
  • the real angle obtained after folding and measured by the operator using the digital protractor described above, is displayed by the digital control system 22 (step 164).
  • the device is then reading a validation order (step 166), given by the operator for example by pressing more or shorter the switch button 68 of the protractor digital.
  • step 168 If the operator indicates in response that the action taken by the digital protractor is not correct (step 168), the step of measure is iterated (back to 164).
  • control system numeric 22 assigns a correction value to the depth of initial penetration, as explained above, for the axis concerned (step 170).
  • step 172 If the current axis is the last axis (step 172), it is performed an update of the database (step 174), of the previously explained.
  • the correction process can be continued for a other fold (steps 178, 180), also characterized by one or two axes, or the operator decides to end the correction process automatic (step 182)
  • FIG 15. An example of information presented to the operator in how this automatic correction mode is run is illustrated in Figure 15.
  • This screen displays the two penetration values Y1, Y2, the two correction values, and the measured angle value (here: 90 °).
  • the production mode is activated by the operator when the latter, after having programmed a part (programming mode) and possibly done correct penetration depth (correction mode), wishes mass production.
  • the digital control system 22 sends a command signal to the press brake 1-2-8a-8b to start production based on penetration depth determined during programming mode or, if correction mode has was also activated, based on the penetration depth corrected.
  • the operator can also activate a so-called quality control mode, designated by the reference 86 on Figure 7B. This mode allows you to check the angle of the last fold made.
  • the algorithm implemented by the digital control system 22 during the execution of the quality control mode is illustrated in the figure 13.
  • a display is made of the programmed angle.
  • step 142 There is then reading and display of an angle measured by the operator using the digital reporter 21 (step 142). This measured angle is displayed. An operator can thus view both the programmed angle and the measured angle, as illustrated in figure 16.
  • a comparison is made by the control system numeric 22 between the measured angle and the programmed angle, and it is checked (step 144) if the angle measured is within the range of tolerance with respect to the programmed angle.
  • a message of correct or out of tolerance folding is displayed (steps 146, 148).
  • the device is then reading an end of quality control (step 150), given by the operator for example in pressing the switch button 68 of the digital reporter 21.
  • step 152 If the end of quality control order is present (step 152), the machine exits the quality control mode. Otherwise reading resumes (step 142).
  • the operator can carry out, using this control mode quality, random checks on any angle during the production or folding.
  • the display mode designated by the reference 84 on the FIG. 7B, makes it possible to display on the screen 24 an angle measured at digital reporter 21 and transmitted by the latter to the digital control system 22 via cable 21a.
  • step 130 an angle of a part positioned on the digital reporter 21 is measured and displayed on the screen 24 (cf. Figure 17) until an order to end viewing (step 134) or a calibration order (step 138) is present.
  • the end order of visualization is given by the operator for example by pressing protractor switch button 68 numeric 21, while the calibration order is given by pressing impulse this same button.
  • the order digital 22 detects an order to end viewing, the execution of the display mode ends at a step 136.
  • the command digital detects a calibration order, the calibration mode, described above, is activated in step 140.
  • the method according to the invention is preferably implemented by means of a program executed by the processor 32 of the digital control system 22 and stored in the area memory 34.
  • This program may have been loaded from a medium (for example: floppy disk or CD Rom or any medium magnetic) capable of being read by a computer system or by the digital control system 22.
  • Such a support therefore includes instructions for making execute a method according to the invention, as described above, and in particular in connection with one of FIGS. 7B, 9, 12, 13 and 14.
  • the set can also be connected to other devices peripherals, for example to an electronic network of communication, to send and / or receive data on angles or folding conditions.
  • a plurality of machines from the same manufacturer can be linked by a network to a central unit which collects data stored by all machines individually. This results in the creation of larger files important, allowing, for example, to achieve statistical processing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Reinforced Plastic Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Presses And Accessory Devices Thereof (AREA)

Claims (38)

  1. Vorrichtung (22) zum digitalen Steuern für eine Biegemaschine (1, 2, 8a, 8b), dadurch gekennzeichnet, daß sie umfaßt:
    Mittel (26) zum Eingeben eines gewünschten Biegewinkels und von Bedingungen oder Kriterien für das Biegen als Eingangsdaten,
    Mittel (34) zum Speichern einer oder mehrerer Datengruppen, die jeweils Bedingungen für das Biegen, einen Biegewinkel und zumindest eine Eindringtiefe umfassen,
    Mittel (32) zum Suchen oder insbesondere programmiert zum Suchen, ob die Eingangsdaten in den Speichermitteln in derselben Datengruppe gespeichert sind, und
    Mittel zum Ausgeben eines Signals, das für die in derselben Datengruppe befindliche Eindringtiefe repräsentativ ist, oder zum Ausgeben eines Steuersignals für die Biegemaschine entsprechend dieser Eindringtiefe.
  2. Vorrichtung zum digitalen Steuern gemäß Anspruch 1, welche ferner Mittel (32) zum Suchen oder insbesondere programmiert zum Suchen umfaßt, ob in den Speichermitteln zwei Datengruppen (GR1, GR2) vorhanden sind, die dieselben Bedingungen für das Biegen umfassen, wie diejenigen, die über die Eingabemittel eingegeben wurden, und die entsprechende Biegewinkel (α1, α2) umfassen, zwischen denen der gewünschte Winkel (α) liegt, und zum Berechnen einer Eindringtiefe in Abhängigkeit von den Eindringtiefen (p1, p2), welche der jeweiligen der beiden Datengruppen zugehörig sind.
  3. Vorrichtung zum digitalen Steuern gemäß Anspruch 1 oder 2, welche ferner Mittel zum Berechnen einer Eindringstiefe gemäß einer vorgegebenen Formel umfaßt, oder Mittel umfaßt, die insbesondere dazu programmiert sind, gemäß einer vorgegebenen Formel eine Eindringtiefe zu berechnen, wenn die Eingangsdaten nicht Teil derselben Datengruppe sind, die in den Speichermitteln gespeichert ist, und wenn in den Speichermitteln nicht zwei Datengruppen (GR1, GR2) vorhanden sind, die dieselben Bedingungen für das Biegen wie die über die Eingabemitteln eingegebenen umfassen, und die entsprechende Biegewinkel (α1, α2) umfassen, zwischen denen der gewünschte Winkel (α) liegt.
  4. Vorrichtung zum digitalen Steuern gemäß Anspruch 1, wobei die Bedingungen für das Biegen die Dicke des Werkstücks umfassen, und wobei die Vorrichtung femer Mittel (32) zum Suchen, oder die insbesondere zum Suchen programmiert sind, umfaßt, ob in den Speichermitteln zwei Gruppen von Daten vorhanden sind:
    die dieselben Bedingungen für das Biegen umfassen, wie die der Eingangsdaten, mit Ausnahme dessen, was die Dicke des Werkstückes betrifft,
    die denselben Biegewinkel wie der gewünschte umfassen, und
    die so aussehen, daß die Blechdicken e1 bzw. e2 der beiden Datengruppen der folgenden Bedingung genügen: e1<e<e2, wobei e die gewünschte Dicke des Blechs ist.
  5. Vorrichtung gemäß Anspruch 4, welche ferner Mittel (32) zum Berechnen einer Eindringtiefe in Abhängigkeit von den Eindringtiefen der beiden Datengruppen umfaßt.
  6. Vorrichtung zum digitalen Steuern gemäß einem der Ansprüche 1 bis 5, welche Mittel umfaßt, um in den Speichermitteln zumindest einen Parameter aus den Parametern Bedingungen für das Biegen, Biegewinkel und Eindringtiefen zu ändern.
  7. Vorrichtung zum digitalen Steuern gemäß einem der Ansprüche 1 bis 6, wobei die Bedingungen für das Biegen aus den folgenden Bedingungen ausgewählt sind:
    Bedingungen betreffend die verwendete Matrix (M),
    Bedingungen betreffend den verwendeten Stempel (P),
    Bedingungen für das zu bearbeitende Werkstück,
    Bedingungen für den zu erzeugenden Falz.
  8. Vorrichtung zum digitalen Steuern gemäß Anspruch 7, wobei die Bedingungen betreffend die Matrix den Winkel der Matrix und/oder den Radius der Matrix und/oder die Breite der Matrix umfassen.
  9. Vorrichtung zum digitalen Steuern gemäß Anspruch 7 oder 8, wobei die Bedingungen betreffend den verwendeten Stempel den Winkel und/oder den Radiusstempel umfassen.
  10. Vorrichtung zum digitalen Steuern gemäß einem der Ansprüche 7 bis 9, wobei die Bedingungen betreffend das Werkstück die Dicke des Werkstücks und/oder die Art des Materials, aus dem das Werkstück besteht und/oder den Widerstand dieses Materials umfassen.
  11. Vorrichtung zum digitalen Steuern gemäß einem der Ansprüche 7 bis 10, wobei sich die Bedingungen betreffend den Falz auf den Biegewinkel und eventuell auf die Biegelänge und/oder die Versetzung des Werkstücks bezogen auf den Mittelpunkt der Maschine beziehen.
  12. Vorrichtung zum digitalen Steuern gemäß einem der Ansprüche 1 bis 11, welche femer Mittel zum Durchführen oder Mittel umfaßt, die insbesondere programmiert sind zum Durchführen eines Vergleichs eines gemessenen Biegewinkels und des gewünschten Biegewinkels.
  13. Vorrichtung zum digitalen Steuern gemäß Anspruch 12, welche Mittel zum Korrigieren der Eindringtiefe oder Mittel, die insbesondere programmiert sind zum Korrigieren der Eindringtiefe für den Fall umfaßt, daß sich aus dem Vergleich ergibt, daß der gemessene Winkel von dem gewünschten Winkel abweicht.
  14. Vorrichtung zum digitalen Steuern gemäß Anspruch 13, welche Mittel zum Aktualisieren oder Mittel, die insbesondere zum Aktualisieren von Daten in den Speichermitteln in Abhängigkeit vom Ergebnis der Korrektur der Eindringtiefe programmiert sind, umfaßt.
  15. Vorrichtung zum digitalen Steuern gemäß Anspruch 13 oder 14, welche Mittel zum Schreiben oder Mittel umfaßt, die insbesondere dazu programmiert sind, in die Mittel zum Speichern eine zusätzliche Datengruppe zu schreiben, welche die Eingangsdaten und die korrigierte Eindringtiefe umfaßt.
  16. Vorrichtung zum digitalen Steuern gemäß einem der Ansprüche 1 bis 15, welche Mittel zum Anzeigen eines gemessenen Biegewinkels und/oder des gewünschten Biegewinkels umfaßt.
  17. Vorrichtung zum digitalen Steuern gemäß einem der Ansprüche 1 bis 16, welche Mittel zum Anzeigen oder Mittel umfaßt, die insbesondere dazu programmiert sind anzuzeigen, ob ein gemessener Winkel in einem bestimmten Toleranzinterval bezüglich des gewünschten Biegewinkels liegt.
  18. Biegepressensystem, mit:
    einer ersten und einer zweiten Schürze (1, 2) von denen eine dazu bestimmt ist, einen Stempel (P) aufzunehmen, und die andere eine Matrix (M),
    Mittel (8a, 8b) zum Bewirken einer relativen Verschiebung von Stempel und Matrix zueinander, und
    einer Steuervorrichtung gemäß einem der Ansprüche 1 bis 17 zum Steuern der Mittel zum Bewirken einer relativen Verschiebung von Stempel und Matrix zueinander
  19. Biegepressensystem gemäß Anspruch 18, welches femer eine digitale Vorrichtung (42, 52, 58, 60) zum Winkelmessen und Vorrichtungen (74, 21a) zum Übertragen eines gemessenen Winkelwerts zur Steuervorrichtung umfaßt.
  20. Verfahren zum digitalen Steuern einer Biegemaschine mit den folgenden Schritten:
    Speichern einer Datengruppe oder mehrerer Datengruppen, die jeweils Bedingungen für das Biegen, einen Biegewinkel und zumindest eine Eindringtiefe umfaßt/umfassen, in Speichermitteln,
    Empfangen eines gewünschten Biegewinkels und von Bedingungen oder Kriterien für das Biegen als Eingangsdaten,
    Suchen, ob die Eingangsdaten in den Speichermitteln in derselben Datengruppe gespeichert sind, und
    Ausgeben eines Signals, das für die in derselben Datengruppe enthaltene Eindringtiefe repräsentativ ist, oder eines Steuersignals für die Maschine gemäß dieser Eindringtiefe.
  21. Verfahren gemäß Anspruch 20, welches ferner einen Schritt umfaßt, der darin besteht, daß man sucht, ob in den Speichermitteln zwei Datengruppen (GR1, GR2) vorhanden sind, die dieselben Bedingungen für das Biegen wie diejenigen umfassen, die in den Eingangsdaten enthalten sind, und die entsprechende Biegewinkel (α1, α2) umfassen, zwischen denen der gewünschte Winkel (α) liegt, und daß man eine Eindringtiefe in Abhängigkeit von den Eindringtiefen (p1, p2) berechnet, die zu der jeweiligen Gruppe der beiden Datengruppen gehören.
  22. Verfahren gemäß Anspruch 20 oder 21, welches ferner einen Schritt umfaßt, der darin besteht, daß man gemäß einer vorbestimmten Formel eine Eindringtiefe berechnet, wenn die Eingangsdaten nicht in derselben, in den Speichermitteln gespeicherten Datengruppe enthalten sind, und wenn in den Speichermitteln nicht zwei Datengruppen (GR1, GR2) vorhanden sind, die dieselben Bedingungen für das Biegen wie diejenigen umfassen, die in den Eingangsdaten enthalten sind, und die entsprechende Biegewinkel (α1, α2) umfassen, zwischen denen der gewünschte Winkel (α) liegt.
  23. Verfahren gemäß Anspruch 20, wobei die Bedingungen für das Biegen die Dicke des Werkstücks umfassen, und wobei das Verfahren ferner einen Schritt umfaßt, der darin besteht, daß man sucht, ob in den Speichermitteln zwei Datengruppen vorhanden sind:
    die dieselben Bedingungen für das Biegen umfassen, wie diejenigen der Eingangsdaten, mit Ausnahme dessen, was die Dicke des Werkstücks betrifft,
    die denselben Biegewinkel wie der gewünschte aufweisen, und
    so aussehen, daß die entsprechenden Blechdicken e1, e2 der beiden Datengruppen der folgenden Bedingung genügen: e1<e<e2, wobei e die gewünschte Dicke des Blechs ist.
  24. Verfahren gemäß Anspruch 23, welches ferner einen Schritt des Berechnens der Eindringtiefe in Abhängigkeit der Eindringtiefen der beiden Datengruppen umfaßt.
  25. Verfahren gemäß einem der Ansprüche 20 bis 24, welches femer einen Schritt umfaßt, der darin besteht, daß man in den Speichermitteln zumindest einen Parameter aus den Bedingungen für das Biegen, den Biegewinkeln und den Eindringtiefen verändert.
  26. Verfahren gemäß einem der Ansprüche 20 bis 25, wobei die Bedingungen für das Biegen aus den folgenden Bedingungen ausgewählt sind:
    Bedingungen betreffend die verwendete Matrix (M),
    Bedingungen betreffend den verwendeten Stempel (P),
    Bedingungen betreffend das zu bearbeitende Werkstück,
    Bedingungen betreffend den zu erzeugenden Falz.
  27. Verfahren gemäß Anspruch 26, wobei die Bedingungen betreffend die Matrix den Winkel der Matrix, und/oder den Radius der Matrix und /oder die Breite der Matrix umfassen.
  28. Verfahren gemäß Anspruch 26 oder 27, wobei die Bedingungen betreffend den verwendeten Stempel den Winkel und/oder den Radius des Stempels umfassen.
  29. Verfahren gemäß einem der Ansprüche 26 bis 28, wobei die Bedingungen betreffend das Werkstück die Dicke des Werkstücks und/oder die Art des Materials, aus denen das Werkstück besteht und/oder den Widerstand dieses Materials umfassen.
  30. Verfahren gemäß einem der Ansprüche 26 bis 29, wobei sich die Bedingungen betreffend den Falz auf den Biegewinkel, eventuell auf die Biegelänge und/oder die Versetzung des Werkstücks bezogen auf den Mittelpunkt der Maschine beziehen.
  31. Verfahren gemäß einem der Ansprüche 20 bis 30, wobei femer ein Vergleich eines gemessenen Biegewinkels mit dem gewünschten Biegewinkel erfolgt.
  32. Verfahren gemäß Anspruch 31, welches einen Schritt umfaßt, der darin besteht, daß man die Eindringtiefe korrigiert, wenn sich aus dem Vergleich ergibt, daß der gemessene Biegewinkel von dem gewünschten Biegewinkel abweicht.
  33. Verfahren gemäß Anspruch 32, welches einen Schritt umfaßt, der darin besteht, Daten in den Speichereinrichtungen auf der Grundlage des Ergebnisses der Korrektur der Eindringtiefe zu aktualisieren.
  34. Verfahren gemäß Anspruch 32 oder 33, welches einen Schritt umfaßt, der darin besteht, daß man in die Speichermittel eine zusätzliche Datengruppe schreibt, die die Eingangsdaten und die korrigierte Eindringtiefe umfaßt.
  35. Verfahren gemäß einem der Ansprüche 32 bis 34, wobei ein gemessener Biegewinkel und/oder der gewünschte Biegewinkel angezeigt wird/werden.
  36. Verfahren gemäß einem der Ansprüche 32 bis 35, wobei eine Anzeige dahingehend erfolgt, ob ein gemessener Winkel in einem bestimmten Toleranzintervall bezogen auf den gewünschten Biegewinkel liegt.
  37. Computerprogramm, welches die Anweisungen umfaßt, um ein Verfahren gemäß einem der Ansprüche 20 bis 36 auszuführen.
  38. Träger, der von einem Computersystem oder einem digitalen Steuersystem gelesen werden kann, auf welchem Informationen für das Ausführen eines Verfahrens gemäß einem der Ansprüche 20 bis 36 durch das Computersystem oder das digitale Steuersystem gespeichert sind.
EP00951644A 1999-07-13 2000-07-10 Verbesserte präzisionsbiegepresse Expired - Lifetime EP1098722B1 (de)

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FR9909077A FR2796320B1 (fr) 1999-07-13 1999-07-13 Presse plieuse a precision amelioree
PCT/FR2000/001991 WO2001003863A1 (fr) 1999-07-13 2000-07-10 Presse plieuse a precision amelioree

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DE60000908D1 (de) 2003-01-16
US6644082B2 (en) 2003-11-11
US20030069662A1 (en) 2003-04-10
DE60000908T2 (de) 2003-10-02
FR2796320A1 (fr) 2001-01-19
ATE228898T1 (de) 2002-12-15
FR2796320B1 (fr) 2001-10-05
EP1098722A1 (de) 2001-05-16
WO2001003863A1 (fr) 2001-01-18
US6651472B2 (en) 2003-11-25
US20030066325A1 (en) 2003-04-10
JP2003504208A (ja) 2003-02-04

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