EP0589066B1 - Méthode de fabrication des produits par des procédés d'emboutissage, influencés par une force ou une pression - Google Patents

Méthode de fabrication des produits par des procédés d'emboutissage, influencés par une force ou une pression Download PDF

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Publication number
EP0589066B1
EP0589066B1 EP19920112315 EP92112315A EP0589066B1 EP 0589066 B1 EP0589066 B1 EP 0589066B1 EP 19920112315 EP19920112315 EP 19920112315 EP 92112315 A EP92112315 A EP 92112315A EP 0589066 B1 EP0589066 B1 EP 0589066B1
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EP
European Patent Office
Prior art keywords
movement
basic material
deviations
time
product
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
EP19920112315
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German (de)
English (en)
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EP0589066A1 (fr
Inventor
Jürgen Dr. Rogos
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.)
Inpro Innovationsgesellschaft fuer Fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH
Original Assignee
Inpro Innovationsgesellschaft fuer Fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH
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.)
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Publication date
Application filed by Inpro Innovationsgesellschaft fuer Fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH filed Critical Inpro Innovationsgesellschaft fuer Fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH
Priority to DE59208404T priority Critical patent/DE59208404D1/de
Priority to EP19920112315 priority patent/EP0589066B1/fr
Publication of EP0589066A1 publication Critical patent/EP0589066A1/fr
Application granted granted Critical
Publication of EP0589066B1 publication Critical patent/EP0589066B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies

Definitions

  • the invention relates to a method for producing molded parts by means of forming processes influenced by the action of force or pressure, in particular thermoformed sheets for body parts of motor vehicles, by regulating the forming process according to the preamble of patent claim 1.
  • a device for controlling or regulating the sheet metal holder force during the drawing process with a hydraulic container - piston - cylinder drive (DE-PS 36 40 50 71), in which to control and regulate the pressures in the sheet metal holder power sets and thus to regulate the sheet metal holder force Proportional or servo valves are provided.
  • a sensor is assigned to the sheet metal holder cylinder, which is connected to a control unit which makes the desired pressure change in the sheet metal holder cylinder depending on the respective drawing progress via the proportional or servo valve.
  • the valves upstream of the sheet metal cylinders are acted upon by electronic control with switching signals which change the cylinder pressure of the sheet metal holder cylinders several times during the shaping process.
  • the drawing path-dependent sheet metal holder pressure corresponds here to a desired curve desired for the deep-drawn part to be produced.
  • the setpoint value setting of a test press during tool testing is entered into a control device which adapts the press setting in the course of production to the boundary conditions fluctuating within tolerances which are caused by changes in the sheet metal characteristic values and the surface roughness.
  • the tolerance range of the sheet holder force curve lies between the unusable cases in which wrinkling and and constriction or cracks occur.
  • a process computer should process the data of the basic machine settings from tool testing, sheet metal value recognition by eddy current methods, sheet metal surface value determination by light-optical measuring methods, lubricant film thickness measurement by capacitive methods, lubricant consistency by refractometer measurement, and the detection of wrinkle measurement Enter the gap between the upper and lower part of the tool and a quality check by structure-borne noise analysis on the equipment and after appropriate measurement data processing for an adaptive control of the sheet metal holder force of the forming step.
  • the invention is based on the object of providing a method of the type mentioned at the outset with which it is possible in a relatively simple manner to produce error-free deep-drawn sheets by regulating the forming process.
  • this object is achieved by the method steps resulting from the characterizing part of claim 1.
  • a tolerance band for the characteristic values of good part and bad part forming processes is determined from calibration forming processes and a reference variable for the movement of the starting material and / or its time derivatives is derived from the tolerance band.
  • Further process-relevant signals can be used as additional reference variables, the significance of these signals in relation to the movement of the starting material and / or their time derivatives being determined from calibration measurements when regulating the forming process.
  • Another process-relevant signal can be used as an additional command variable for the size of the tool gap.
  • further process-relevant signals can be used as the additional reference variables.
  • the method according to the invention ensures, from a relatively simple and effective manner, a practically flawless production of pressed parts in the pressing plant by regulating the forming process in such a way that the sheet is drawn into the drawing mold in an operative connection with the movement of the drawing die.
  • the movement of the sheet on the hold-down device is measured and regulated via the manipulated variable "hold-down force" so that it corresponds to the movement of the sheet for a good part forming process.
  • the tolerance band for a workpiece-specific hold-down force is determined using calibration measurements, which include the characteristic values of good part and bad part forming processes.
  • Fig. 1 shows the course of the sheet metal holder force during the forming process for bad part forming processes (wrinkling or tearing) and a good part forming process.
  • bad part forming processes wrinkleling or tearing
  • a good part forming process In the production of the molded parts by means of the forming process influenced by the action of force or pressure 1, a tolerance band for the characteristic values of the good part and bad part forming processes is determined from calibration forming processes for the movement of the starting material of the workpiece. A reference variable for the movement of the starting material is then derived from the tolerance band.
  • the movement of the material can either be measured directly or the material speed can be determined at various points via correlation measurements of the material texture.
  • 2 shows a measuring arrangement for direct measurement of the sheet metal position, in which a series of optical triangulation sensors 5 is arranged around the workpiece 1, which is arranged on a hold-down device 2 between a die cushion 3 and a punch 4 of a press, with which the migration of individual points on the edge of the workpiece 1 is specifically observed. A path-time diagram is created for each of these points. Online comparison of the forming process is then possible by comparing the curve profiles with the corresponding data of the IO process.
  • 3 shows an arrangement for the inductive measurement of the sheet metal speed, with which the induction of voltages during the movement of a conductor in a magnetic field is used.
  • 3a and 3b show a cross section through the press or a view of the hold-down device 2.
  • a coil 6 is inserted, which is connected to a DC voltage source 7.
  • the arrangement of the two contact pins 8 must be such that the connecting line between the two contact pins 8 is arranged both perpendicular to the magnetic field and to the direction of movement A (see arrow in FIG. 3b) of the material.
  • the determination of the movement of the material can also be determined indirectly in the forming process, e.g. by measuring the sheet speed with correlation methods, as can be seen in FIG. 4.
  • the material texture is measured at various points on the circuit board 1 by means of the sensors 5 arranged in the hold-down device 2, the signals of which are each displayed on a screen 9.
  • the cross-correlation function (KKF) between the two signals is calculated from the corresponding output signals 10 by means of a correlator 11 and displayed on a screen 12. From the position of the main maxima of the cross-correlation functions, the running time of the material and thus the speed of the material can be calculated as a quotient of the sensor distance b and the running time.
  • the material texture can be measured by means of interferometric methods, by means of mechanical-inductive methods or by means of non-contact inductive displacement sensors.
  • So-called heterodyne profilers can be used for interferometric texture measurement, which are not excessively sensitive to vibration and of which the material surface is slightly affected by two collinear laser beams different frequency is illuminated. If these two laser beams are brought to interference after reflection on the material surface, a phase difference results which is directly dependent on the difference in height of the two light spot locations on the material surface.
  • inductive displacement sensors with probe tips are installed in the holding-down device and in the die cushion.
  • the resolution of which is in the submicro range the roughness of the material, which is in the range of micrometers, can be suitably scanned. If three sensors are arranged on the corner points of a right-angled triangle, the speed can be recorded vectorially.
  • Sensors for contactless inductive displacement measurement usually have a relatively large cross-sectional area, the diameter being in the millimeter range.
  • the measurement signal is, however, an integral over this cross-sectional area.
  • only sensors can be used whose tactile area has been reduced accordingly, e.g. by converting the coil cores.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (5)

  1. Méthode de fabrication des produits (1) par des procédés d'emboutissage, influencés par une force ou une pression, tout particulièrement de tôles pour emboutissage profond (1) pour des pièces pour carosseries de véhicules, par réglage du procédé d'emboutissage, le mouvement du produit de base (1) pour le procédé d'emboutissage étant mesuré au cours de celui-ci et étant réglé par la force ou la pression appliquées de manière que, indépendamment des grandeurs pertubatrices, le mouvement du produit (1) correspond au mouvement du produit lors d'un procédé d'emboutissage d'un bon produit, caractérisée par le fait que, additionellement, les déviations en temps du mouvement du produit de base sont mesurées lors du procédé d'emboutissage et sont régleées par la force ou la pression appliquées de manière que, additionellement, les déviations en temps du mouvement du produit (1) correspondent, indépendamment des grandeurs pertubatrices, au mouvement du produit (1) et à ses déviations en temps lors d'un procédé d'emboutissage d'un bon produit et que la mesure du mouvement du produit de base et de ses déviations en temps est réalisée par l'enregistrement sensorique de la texture de matière en calculant moyennant la fonction de corrélation en croix la vitesse du produit de base (1) entre deux signaux de deux senseurs (5) prévus en une distance minime au produit de base (1).
  2. Méthode suivant revendication 1, caractérisée par le fait que pour le mouvement du produit de base (1) d'une pièce à travailler spéciale (2) et de ses déviations en temps une bande de tolérance est déterminée pour les valeurs caractéristiques de procédés d'emboutissage de bons et de mauvais produits à partir de prodédés de calibrage et qu'une grandeur de référence est dérivée pour le mouvement du produit de base et de ses déviations en temps.
  3. Méthode suivant revendication 1 à 2, caractérisée par le fait que d'autres signaux essentiels pour le procédé sont utilisés comme grandeurs de référence additionelles, la signification de ces signaux lors du réglage du procédé d'emboutissage par rapport au mouvement du produit de base (1) et à ses déviations en temps étant déterminée à partir des mesures de calibrage.
  4. Méthode suivant revendication 3, caractérisée par le fait qu'un autre signal essentiel pour le procédé est utilisé comme grandeur de référence additionelle pour la grandeur de la fente d'outil.
  5. Méthode suivant revendications 3 et 4, caractérisée par le fait que d'autres signaux essentiels pour le procédé sont utilisés comme grandeurs de référence additionelles pour les valeurs caractéristiques résultant de l'analyse acoustique effectuée à la moule de pièce.
EP19920112315 1992-07-18 1992-07-18 Méthode de fabrication des produits par des procédés d'emboutissage, influencés par une force ou une pression Expired - Lifetime EP0589066B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59208404T DE59208404D1 (de) 1992-07-18 1992-07-18 Verfahren zur Herstellung von Formteilen mittels durch Kraft- oder Druckeinwirkung beeinflusster Umformprozesse
EP19920112315 EP0589066B1 (fr) 1992-07-18 1992-07-18 Méthode de fabrication des produits par des procédés d'emboutissage, influencés par une force ou une pression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19920112315 EP0589066B1 (fr) 1992-07-18 1992-07-18 Méthode de fabrication des produits par des procédés d'emboutissage, influencés par une force ou une pression

Publications (2)

Publication Number Publication Date
EP0589066A1 EP0589066A1 (fr) 1994-03-30
EP0589066B1 true EP0589066B1 (fr) 1997-04-23

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EP19920112315 Expired - Lifetime EP0589066B1 (fr) 1992-07-18 1992-07-18 Méthode de fabrication des produits par des procédés d'emboutissage, influencés par une force ou une pression

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EP (1) EP0589066B1 (fr)
DE (1) DE59208404D1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004031222B3 (de) * 2004-06-28 2005-08-11 Benteler Automobiltechnik Gmbh Strukturbauteil für ein Kraftfahrzeug
DE102004031184B3 (de) * 2004-06-28 2005-10-06 Benteler Automobiltechnik Gmbh Karosseriekomponente
WO2008020099A1 (fr) 2006-08-08 2008-02-21 Ricardo Arenzana Zorrilla Outil de conformation à unité sensible
DE202017103894U1 (de) 2017-06-29 2018-10-16 Forschungsgesellschaft Umformtechnik Mbh Einrichtung zur Regelung des Tiefziehprozesses während des Pressenhubes
DE102017114596A1 (de) 2017-06-29 2019-01-03 Forschungsgesellschaft Umformtechnik Mbh Verfahren und Einrichtung zur Regelung des Tiefziehprozesses während des Pressenhubes
DE102019205464B3 (de) * 2019-04-16 2020-09-24 Volkswagen Aktiengesellschaft Verfahren zur Ermittlung des Blecheinlaufs in einem Blechumformwerkzeug, sowie pressengebundenes Tiefziehwerkzeug und Verfahren zur Regelung eines Tiefziehvorgangs

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090875A2 (fr) * 2001-05-07 2002-11-14 Northwestern University Capteurs a entrainement en temps reel et procedes de fabrication
DE10208377A1 (de) * 2002-02-27 2003-09-25 Fraunhofer Ges Forschung Vorrichtung zur berührungslosen Abstandsmessung zu einer, in einem Engspalt befindlichen Fläche
DE102010011849A1 (de) 2009-09-30 2011-04-07 Micro-Epsilon Messtechnik Gmbh & Co. Kg Vorrichtung und Verfahren zum Erfassen der Bewegung eines dünnen Körpers
DE202010013721U1 (de) 2009-09-30 2011-04-28 Micro-Epsilon Messtechnik Gmbh & Co. Kg Vorrichtung zum Erfassen der Bewegung eines dünnen Körpers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004031222B3 (de) * 2004-06-28 2005-08-11 Benteler Automobiltechnik Gmbh Strukturbauteil für ein Kraftfahrzeug
DE102004031184B3 (de) * 2004-06-28 2005-10-06 Benteler Automobiltechnik Gmbh Karosseriekomponente
WO2008020099A1 (fr) 2006-08-08 2008-02-21 Ricardo Arenzana Zorrilla Outil de conformation à unité sensible
DE202017103894U1 (de) 2017-06-29 2018-10-16 Forschungsgesellschaft Umformtechnik Mbh Einrichtung zur Regelung des Tiefziehprozesses während des Pressenhubes
DE102017114596A1 (de) 2017-06-29 2019-01-03 Forschungsgesellschaft Umformtechnik Mbh Verfahren und Einrichtung zur Regelung des Tiefziehprozesses während des Pressenhubes
DE102017114596B4 (de) * 2017-06-29 2020-10-01 Forschungsgesellschaft Umformtechnik Mbh Verfahren und Vorrichtung zur Regelung des Tiefziehprozesses einer Platine während eines Pressenhubes
DE102019205464B3 (de) * 2019-04-16 2020-09-24 Volkswagen Aktiengesellschaft Verfahren zur Ermittlung des Blecheinlaufs in einem Blechumformwerkzeug, sowie pressengebundenes Tiefziehwerkzeug und Verfahren zur Regelung eines Tiefziehvorgangs

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Publication number Publication date
EP0589066A1 (fr) 1994-03-30
DE59208404D1 (de) 1997-05-28

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