EP0806256A2 - Procédé de contrÔle du coulement de matériau pendant l'emboutissage des pièces de tÔle et dispositif pour la mise en oeuvre du procédé - Google Patents

Procédé de contrÔle du coulement de matériau pendant l'emboutissage des pièces de tÔle et dispositif pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0806256A2
EP0806256A2 EP97107440A EP97107440A EP0806256A2 EP 0806256 A2 EP0806256 A2 EP 0806256A2 EP 97107440 A EP97107440 A EP 97107440A EP 97107440 A EP97107440 A EP 97107440A EP 0806256 A2 EP0806256 A2 EP 0806256A2
Authority
EP
European Patent Office
Prior art keywords
hold
force
frictional force
control loop
sheet metal
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
EP97107440A
Other languages
German (de)
English (en)
Other versions
EP0806256B1 (fr
EP0806256A3 (fr
Inventor
Klaus Prof. Dr.-Ing. Siegert
Michael Dipl.-Ing. Ziegler
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.)
Mueller Weingarten AG
Original Assignee
Mueller Weingarten AG
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 Mueller Weingarten AG filed Critical Mueller Weingarten AG
Publication of EP0806256A2 publication Critical patent/EP0806256A2/fr
Publication of EP0806256A3 publication Critical patent/EP0806256A3/fr
Application granted granted Critical
Publication of EP0806256B1 publication Critical patent/EP0806256B1/fr
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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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders
    • 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
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically

Definitions

  • the invention relates to a method for material flow control when drawing sheet metal parts according to the preamble of claim 1 and a device for performing the method according to the preamble of claim 10.
  • the drawing device can also be realized by means of hydraulic or pneumatic cylinders arranged in the drawing tool.
  • FIG. 1a shows a double-acting press for drawing regular sheet metal parts.
  • the pressing device 1 shows a workpiece 2 (sheet metal) which is clamped between a drawing ring 3 and a hold-down device 4 and is acted upon by a drawing punch 5.
  • the punch force is denoted by F S , the hold-down force by F N.
  • the workpiece 2 is held on the drawing flange 6 and on the drawing edge 7 in the Drawn part wall 8 (frame) formed.
  • the material flow is also influenced by the friction acting between hold-down device 4 and sheet metal 2 or between sheet metal 2 and drawing ring 3.
  • FIG. 1b shows the basic structure of a known single-acting press device 9 as a single-acting press with a hydraulic pulling device 10 with hydraulic cylinders 11 and the pulling ring 3, the holding-down device 4 and the pulling die 5 described for FIG. 1a.
  • a holding-down force sensor is indicated by reference number 13. This press can also be used to pull irregular sheet metal parts.
  • the hydraulic pulling devices 10 consisting of hydraulic cylinders 11 that can be individually controlled via servo valves (not shown in detail), can introduce the hold-down forces F N directly into the hold-down device 4 via the piston rods 12 (see FIG. 1b) or indirectly via sleeves (see, for example, DE 41 12 656 A1).
  • hold-down pressure profiles defined before the drawing process are specified via the drawing path in a control loop which realizes the desired holding-down force during the drawing process.
  • the disadvantage of these systems is that the predefined hold-down pressure profiles for controlling the material flow are based on constant frictional relationships between hold-down device 4 and plate 2 or between the drawing ring and plate.
  • Control loops represent a significant improvement and use forming parameters such as the flange edge inlet, the punch force or the pleat height of the current drawing process as a control variable.
  • the punch force F S contains the forces of friction between sheet metal 2 and hold-down device 4 and the friction between drawing ring 3 and hold-down device 4. However, it also includes all other frictional forces and the forming forces, so that they are only of limited use as a control variable for controlling the material flow is. The experience gained with this confirms the criticism of the use of these variables as reference variables for material flow control.
  • the invention has for its object to improve the known drawing methods and drawing presses and in particular to enable a more precise recording of the drawing parameters and the associated process flows.
  • the frictional force between sheet metal and hold-down device or sheet and drawing ring should be taken into account as a controlled variable.
  • FIGS 1a, 1b show the known prior art
  • FIG. 2 shows a schematic illustration of a drawing device according to the invention with a control device, the same parts being identified with the same reference numerals as possible with respect to FIGS. 1a, 1b, as far as possible.
  • a control circuit 21 is used for material flow control, which, using the hold-down force F N as manipulated variable 22 of the hold-down force F N, allows the friction acting on the surface 23 of the hold-down device and / or the drawing ring 3 to regulate according to a predetermined command variable 24 (friction force F R over the drawing path s) (FIG. 2).
  • the friction force F R is therefore measured via a friction force sensor 25, 25 ′, 25 ′′, which is preferably designed as a three-component piezo force measuring element 26, ie based on a piezoelectric effect.
  • Such sensors 25 ', 25'' can in particular also be installed at predetermined locations on the hold-down device 4 and / or also on the drawing ring 3 (see dashed lines in FIG. 2).
  • the control loop shown in FIG. 2 reacts automatically to the changes in the tribological system 40, ie it controls automatically the changes in the friction force measured with the friction force sensor 25, which are caused, for example, by changes in the amount of lubricant and the type of lubricant, the sheet surface, etc.
  • a press or tool device 20 is required which allows the hold-down force 30 to be changed during the drawing process. This is possible when using hydraulic die cushions in the table of single-acting presses, as is also shown in principle in FIG. 1b.
  • a preferably segmented hold-down device 4 with upper segment 27 and lower segment 28 are each acted upon by their own hydraulic cylinder 11 arranged in the press 20 or possibly also in the tool, wherein each cylinder 11 can be actuated via its own servo valve 29.
  • the servo valve 29 controls the oil flow and thus determines the pressure acting in the cylinder 11 and thus the hold-down force 30 prevailing at the segment 27. This can be determined both by a pressure measurement in the cylinder 11 or by a hold-down force sensor 25, 26 arranged in the force flow.
  • the segment is therefore supported by three-component piezo force measuring elements 26. These allow the measurement of a frictional force 25 'and the hold-down force 30 acting on the segment 27. If necessary, only one frictional force sensor can also be introduced into the hold-down device of the drawing tool. A segmentation of the hold-down device can possibly be omitted if the design is correspondingly "soft" and elastic.
  • the friction force sensor in corner areas in which folds are to be suppressed can be coupled with a fold height sensor known from the literature, so that it is always ensured that the hold-down force is at least so great that folds in the flange are reliably avoided.
  • a computer 31 with an analog / digital interface is used as the control unit.
  • the desired curve 32 of the frictional force can be stored as a guide variable 24 via the tappet path.
  • the assigned value of the frictional force can be read out from this control unit 31. This is given to controller 35 as setpoint 36.
  • controller 35 With the help of the friction force sensor 25 and the downstream amplifier 37, the associated actual value of the friction force can be given to the second input of the controller 35. If the controller determines a difference between setpoint 36 and actual value 38, it generates an actuating signal 39 which is fed to an actuator (servo valve 29) of the hydraulic circuit of the segment. The signal influences the control element in such a way that the actual value of the frictional force changes so that the difference between actual value 38 and setpoint 36 is minimized.
  • the control loop according to the invention accordingly reacts independently to changes in the friction between the hold-down device and the sheet metal and between the drawing ring and sheet metal, caused by changes in the type or amount of lubricant on the sheet metal, changes in the sheet metal surface and by tool lock or the like (tribological properties).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
EP97107440A 1996-05-06 1997-05-06 Procédé de contrÔle du coulement de matériau pendant l'emboutissage des pièces de tÔle et dispositif pour la mise en oeuvre du procédé Expired - Lifetime EP0806256B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19617965 1996-05-06
DE19617965 1996-05-06

Publications (3)

Publication Number Publication Date
EP0806256A2 true EP0806256A2 (fr) 1997-11-12
EP0806256A3 EP0806256A3 (fr) 1998-01-21
EP0806256B1 EP0806256B1 (fr) 1999-11-10

Family

ID=7793355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97107440A Expired - Lifetime EP0806256B1 (fr) 1996-05-06 1997-05-06 Procédé de contrÔle du coulement de matériau pendant l'emboutissage des pièces de tÔle et dispositif pour la mise en oeuvre du procédé

Country Status (2)

Country Link
EP (1) EP0806256B1 (fr)
DE (2) DE19718841A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0974410A3 (fr) * 1998-07-17 2003-04-23 EP Technology AB Dispositif à contrôle hydraulique pour élément de tenue à contrepression
WO2004009263A1 (fr) * 2002-07-20 2004-01-29 Nothelfer Gmbh Procede de gestion du flux de matieres lors d'un processus d'emboutissage de toles et outil d'emboutissage
NL1021738C2 (nl) * 2002-10-24 2004-04-27 Tno Werkwijze en inrichting voor het reduceren van plooivorming bij dieptrekken.
US10786842B2 (en) 2018-09-12 2020-09-29 Fca Us Llc Draw-in control for sheet drawing

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10210573A1 (de) * 2002-03-11 2003-10-02 Dieffenbacher Gmbh Maschf Hydroelastische Tiefzieheinrichtung
DE10329898B4 (de) * 2003-07-03 2006-09-28 Thyssenkrupp Steel Ag Verfahren und Vorrichtung zum Umformen von Blechplatinen
DE10331939B4 (de) * 2003-07-15 2014-09-18 Bayerische Motoren Werke Aktiengesellschaft Blechumformwerkzeug
DE102004059141A1 (de) * 2004-12-08 2006-06-14 Wieber, Christian, Dipl.-Ing.(FH), Batu Caves Hydraulische Presse

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4338828C2 (de) * 1993-11-13 1996-01-25 Daimler Benz Ag Verfahren zum Betreiben von Ziehpressen sowie hierzu geeignete Ziehpresse

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0974410A3 (fr) * 1998-07-17 2003-04-23 EP Technology AB Dispositif à contrôle hydraulique pour élément de tenue à contrepression
WO2004009263A1 (fr) * 2002-07-20 2004-01-29 Nothelfer Gmbh Procede de gestion du flux de matieres lors d'un processus d'emboutissage de toles et outil d'emboutissage
US7086265B2 (en) 2002-07-20 2006-08-08 Nothelfer Gmbh Method for controlling the material flow during the deep-drawings of sheet metal, and deep-drawing tool
NL1021738C2 (nl) * 2002-10-24 2004-04-27 Tno Werkwijze en inrichting voor het reduceren van plooivorming bij dieptrekken.
WO2004037460A1 (fr) * 2002-10-24 2004-05-06 Nederlandse Organisatie Voor Toegepast-Natuurwe Tenschappelijk Onderzoek Tno Procede et appareil pour reduire la formation de plis dans une operation d'emboutissage profond
US10786842B2 (en) 2018-09-12 2020-09-29 Fca Us Llc Draw-in control for sheet drawing

Also Published As

Publication number Publication date
EP0806256B1 (fr) 1999-11-10
DE19718841A1 (de) 1997-11-13
EP0806256A3 (fr) 1998-01-21
DE59700677D1 (de) 1999-12-16

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