EP2492027B1 - Dispositif d'emboutissage d'une pièce - Google Patents

Dispositif d'emboutissage d'une pièce Download PDF

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Publication number
EP2492027B1
EP2492027B1 EP20110155585 EP11155585A EP2492027B1 EP 2492027 B1 EP2492027 B1 EP 2492027B1 EP 20110155585 EP20110155585 EP 20110155585 EP 11155585 A EP11155585 A EP 11155585A EP 2492027 B1 EP2492027 B1 EP 2492027B1
Authority
EP
European Patent Office
Prior art keywords
adjustment
tool
workpiece
soll
force
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.)
Active
Application number
EP20110155585
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German (de)
English (en)
Other versions
EP2492027A1 (fr
Inventor
Jürgen Büssert
Horst KÖRZDÖRFER
Oleg Schlegel
Elmar SCHÄFERS
Carsten Dr. Hamm
Michael Kaever
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.)
Siemens AG
Original Assignee
Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP20110155585 priority Critical patent/EP2492027B1/fr
Publication of EP2492027A1 publication Critical patent/EP2492027A1/fr
Application granted granted Critical
Publication of EP2492027B1 publication Critical patent/EP2492027B1/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam

Definitions

  • the present invention relates to a device for deep drawing a workpiece according to the preamble of claim 1. Moreover, the present invention relates to a method for deep drawing a workpiece according to the preamble of claim 6. Such a device or such a method is known from DE-A-10 2004 049 149 known.
  • Deep drawing is one of the most important forming processes used in industry and especially in manufacturing.
  • a workpiece for example a metal sheet
  • the geometry of the upper and lower tools determines the shape of the formed workpiece.
  • a mechanical force is exerted on the upper tool via a plunger and thus the workpiece is formed.
  • the geometry of the tools used and the process sizes which depend, for example, on the material of the workpiece, the process force and the duration of the process, can cause asymmetric loading of the ram.
  • This basically causes a tilting of the Stö- ⁇ els in his leadership, whereby the upper tool is no longer evenly loaded and thus twisted or tilted.
  • This results in long drawing distances to a one-sided narrowing of the lateral gap between the upper and lower tool, whereby the thickness of the formed workpiece can be partially reduced.
  • the quality of the formed workpiece can be reduced and its mechanical strength can be reduced.
  • the twisting or tilting can result in a collision of the upper and lower tool, which can lead to damage.
  • the leadership of the plunger can be designed such that the tiltability of the plunger is reduced.
  • the tiltability of the plunger can be further reduced by the plunger and the associated guide are designed so that they have a small play each other.
  • a favorable ratio of ram height to ram width here also has a positive effect.
  • Another possibility is to integrate corresponding guide holes and pins in the tool, by which a rotation or tilting of the individual parts of the tool is prevented.
  • the individual parts of the tool must be designed so that they can absorb the high mechanical stresses resulting from the process forces.
  • a device for producing and / or processing of parts is known.
  • the device is used in particular for producing stamped parts, with at least one tool which can be placed under pressure and / or force.
  • the device comprises a plurality of force-transmitting elements that can be both force-dependent and path-dependent independently and controlled and / or regulated as required.
  • the object of the present invention is to make the deep drawing of a workpiece, in particular at high process forces, more effective.
  • the tool which is used for deep drawing, this is supported on a corresponding reference plane, which may be, for example, the floor or the foundation.
  • the tool in particular a lower tool, is supported on at least two support points via a respective adjusting device.
  • the distance between the reference plane and the tool can be adjusted by the at least two adjusting devices.
  • a corresponding measuring device is provided for this purpose.
  • a measuring device can be provided, by means of which the adjustment paths are determined by all adjusting devices, as well as a separate measuring device can be provided on each adjustment.
  • the adjusting devices are regulated on the basis of the difference between the adjustment paths.
  • tilting or pivoting between the parts of the tool for example the upper and the lower tool
  • tilting or pivoting between the parts of the tool can be compensated by the corresponding control of the adjustment paths.
  • a symmetrical load is applied to the plunger, ⁇ urch which a force is transmitted to the upper tool.
  • the deep-drawing can be performed more effectively especially at high forces and the quality and the mechanical strength of the formed workpiece can be increased.
  • a Sollverstellkraft is regulated for each of the adjusting devices in dependence on the difference of the adjustment paths. From the difference of the adjustment of the adjustment can be concluded that an asymmetric load on the tool.
  • the respective Sollverstellkraft can be determined, which is to be applied by the respective adjustment means at the support points to compensate for the asymmetric load.
  • the respective desired adjusting force on the adjusting devices is compared with the force actually applied to the respective adjusting devices and regulated by a corresponding regulating device.
  • the setpoint adjustment force is additionally determined with the regulator device as a function of a proportion of a force acting on the workpiece.
  • the respective Sollverstell mean the Verstelleinrichwerden determined on the one hand by means of a regulator device from the difference of the adjustment and on the other hand additionally determined by a proportion of the force acting on the workpiece.
  • the force acting on the workpiece may, for example, be that force which is exerted on the upper tool and thus on the workpiece during deep drawing by the plunger.
  • process parameters such as, for example, the material and the geometry of the workpiece to be deformed as well as the duration of the deep-drawing process can also be taken into account in order to determine the time profile of the force acting on the workpiece.
  • the force acting on the workpiece force is determined by a suitable measuring device over the time course of the deep drawing operation. In this way, asymmetric loading of the tool can be counteracted particularly effectively.
  • an adjusting speed for each of the adjusting devices is regulated by the regulating device as a function of the difference between the adjusting paths.
  • a symmetrical loading of the individual parts of the tool and of the workpiece can be achieved by regulating the respective adjustment speeds of the adjusting devices.
  • the adjustment speeds are here also controlled in dependence on the difference of the adjustment paths in order to achieve a corresponding tilt compensation, by which an asymmetric load and / or tilting of the individual parts of the tool is prevented.
  • a respective Sollverstell from the difference of the adjustment paths and additionally determined in dependence on a force acting on the workpiece and adjusting forces generated by the adjusting means by the regulator means for each of the adjusting.
  • the respective adjustment speed of the adjusting devices is regulated here in each case as a function of a nominal displacement speed, which is determined on the one hand from the difference of the adjustment paths and additionally in dependence on the force acting on the workpiece.
  • the force acting on the workpiece is additionally compared with the actually generated forces of the respective adjusting devices. Also, by this embodiment of the apparatus for deep drawing a workpiece deep drawing can be made particularly effective.
  • the direction of the two adjusting forces and the direction of the force exerted on the workpiece are oppositely directed.
  • the force acting on the workpiece force can be compensated by the at least two adjusting forces by which the workpiece, in particular the lower tool, is supported on at least two support points.
  • Devices in which two or more drives act in the same direction are known, for example, from the so-called gantry drive.
  • the interpolation points are arranged point-symmetrically to the center or to the center of gravity of the tool.
  • the support points may for example be arranged at the diagonally opposite corners.
  • a separate adjusting device can likewise be provided for each corner of the workpiece.
  • the tool is adjustably supported on only two diagonally opposite corners or areas.
  • the interpolation points are arranged point-symmetrically to a center of gravity of the tool, in particular of the lower tool. In this way, asymmetric loading of the tool can be compensated for particularly easily.
  • the forming process can be carried out effectively and accurately, thus increasing the quality of the formed workpieces.
  • the tools of the thermoforming device can therefore be designed for a lower mechanical load. Therefore, the dimensions of the deep drawing apparatus and the weight can be reduced. In this way, in addition, the usability of the deep drawing process can be extended.
  • FIG. 1 shows a first embodiment of a control circuit 10 for a device for deep drawing a workpiece.
  • a tool not shown here by two adjusting devices 12, 14 at two points supported to a reference plane.
  • the adjustment paths x 1 , x 2 of the adjusting devices 12, 14 are determined.
  • the adjusting devices 12, 14 may be designed, for example, in the form of corresponding hydraulic cylinders or actuators.
  • the measuring device for determining the adjustment paths x 1 , x 2 may be designed as a separate measuring device or be integrated in the respective adjusting devices 12, 14.
  • the measuring device can be realized by distance or position sensors.
  • the two adjustment paths x 1 , x 2 are determined.
  • the difference between the two adjustment paths x 1 , x 2 is calculated, which can result in asymmetric loading of the tool, in particular of the lower tool, in consequence.
  • the difference between the two adjustment paths x 1 , x 2 is transmitted to a controller 18, which determines from the difference of the two adjustment paths x 1 , x 2 a difference in the forces generated by the adjusting devices 12 and 14.
  • the controller 18 may be designed in this embodiment as a PI controller or as a PID controller.
  • the force value generated at the output 20 of the controller 18 is added or subtracted at the nodes 22 and 24 with the respective proportion of the sum force F ⁇ , soll .
  • the sum force F ⁇ should correspond to the force which acts on the workpiece during the deep-drawing process.
  • the sum force F ⁇ , soll is known for example on the basis of the process parameters or can be determined with the aid of a corresponding measuring device over the entire time course of the deep drawing process.
  • the sum force F ⁇ shall be multiplied in this case by the factor 1/2, since in this control loop 10 two adjusting devices 12, 14 are provided, and the set force F ⁇ , should be divided equally to both parts of the control loop 10.
  • the difference of half of the desired force F ⁇ should be formed with the force value at the output 20 of the controller 18. Accordingly, the sum of half of the setpoint force F ⁇ , setpoint is formed at the node 24 with the force value provided at the output 20 of the controller 18.
  • the respective signs at the nodes 22 and 24 are corresponding to the difference of the adjustment paths x 1 and X 2, which is calculated at the node 16, predetermined.
  • the corresponding desired forces F 1 , should and F 2 should be determined at the nodes 26 and 28.
  • the Sollverstell concept F 1 , soll and F 2 , Soll are compared with the forces F 1 and F 2 , which are determined on the adjusting devices 12, 14 by means of a measuring device.
  • a measuring device can for example determine the forces F 1 and F 2 based on the respective pressure of the hydraulic fluid in the hydraulic actuators.
  • the respective forces F 1 , F 2 , on the adjusting devices 12, 14 are controlled by means of a force regulator 30, 32 in dependence on the Sollverstell characteristicn F 1 , should , F 2 , target .
  • valves in the adjusting devices 12, 14 can be actuated by the force regulators 30, 32.
  • FIG. 2 shows a second embodiment of a control circuit 34 for a device for deep drawing a workpiece.
  • the difference between the two adjustment paths x 1 and x 2 is initially formed at the node 36.
  • the difference of the adjustment paths x 1 and x 2 are fed to a controller 38.
  • this regulator 38 which may be designed, for example, as a P regulator, a corresponding speed signal is provided from the difference of the adjustment paths x 1 and x 2 at the output 40 of the regulator 38.
  • the adjusting forces F 1 and F 2 respectively generated by the adjusting devices 12, 14 are determined in the control loop 34 with the aid of a measuring device, not shown here.
  • the two adjusting forces F 1 and F 2 are added at the node 42 of the control loop 34.
  • the sum of the two adjusting forces F 1 and F 2 is deducted from the sum force F ⁇ , soll and the resulting force value is transferred to the controller 44, which may be designed, for example, as a PI controller.
  • the sum force F ⁇ should , as in the previous embodiment, the force which acts on the workpiece.
  • the signal at the output 40 of the regulator 38 is subtracted from the signal at the output 46 of the regulator 44.
  • the signal at the output 40 of the regulator 38 is correspondingly added to the signal at the output 46 of the regulator 44.
  • the signs at the nodes 48 and 50 are given according to the difference of the adjustment paths x 1 and x 2 which is determined at the node 36.
  • a target displacement speed V 1 , soll and V 2 shall be provided.
  • the desired adjustment speeds V 1 , Soll and V 2 , Soll are compared at the nodes 52 and 54 with the respective value of the adjustment speed v 1 and v 2 .
  • the adjustment speeds v 1 and v 2 can be determined, for example, based on the time derivative of the adjustment paths x 1 and x 2 . In this way, the adjustment speeds v 1 , v 2 by means of the two controllers 56 and 58, which may be formed, for example, as a PI controller or PID controller can be controlled.
  • control circuit 34 can basically be divided into two areas I and II.
  • the region of the control loop 34 denoted by I relates to a tilt compensation of the tool
  • the region of the control loop 34 denoted by II representing a corresponding equalization control.
  • control circuits 10 and 34 are shown by way of example for two adjusting devices 12, 14. It is also conceivable to use more than two adjusting devices in a device for deep drawing a workpiece.

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

Claims (6)

  1. Dispositif d'emboutissage d'une pièce comprenant :
    - un outil qui a au moins deux points d'appui et
    - au moins deux dispositifs ( 12 , 14 ) de réglage par lesquels l'outil s'appuie sur les au moins deux points d'appui,
    caractérisé par
    - un dispositif de mesure de trajets ( x1 , X2 ) de réglage des dispositifs ( 12 , 14 ) de réglage et
    - un dispositif de réglage, par lequel les au moins deux dispositifs ( 12 , 14 ) de réglage peuvent être réglés au moyen d'une différence des trajets ( x1 , x2 ) de réglage, dans lequel
    - par le dispositif de réglage, on détermine des forces ( F1,soll , F2,soll ) de réglage respectif des dispositifs ( 12 14 ) de réglage, d'une part à partir de la différence des trajets ( x1 , x2 ) de réglage et d'autre part, en outre, par une composante de la force ( F∑,soll ) appliquée à la pièce, de manière à compenser une dissymétrie de charge de l'outil.
  2. Dispositif suivant la revendication 1, caractérisé en ce que, par le dispositif de réglage, une vitesse ( v1 , v2 ) de réglage de chacun des dispositifs ( 12 , 14 ) de réglage est réglée en fonction de la différence des trajets ( x1 , x2 ) de réglage.
  3. Dispositif suivant la revendication 2, caractérisé en ce que, par le dispositif de réglage, il est déterminé pour chacun des dispositifs ( 12 , 14 ) de réglage une vitesse ( V1, soll , V2, soll ) de réglage de consigne respective à partir de la différence des trajets ( x1 , x2 ) de réglage et, en outre, en fonction d'une force ( F∑,soll ) appliquée à la pièce et des forces ( F1 , F2 ) de réglage produites par les dispositifs ( 12 , 14 ) de réglage.
  4. Dispositif suivant l'une des revendications précédentes, caractérisé en ce que le sens des deux forces ( F1 , F2 ) de réglage et le sens de la force ( F∑,soll ) appliquée à la pièce sont contraires.
  5. Dispositif suivant l'une des revendications précédentes, caractérisé en ce que les points d'appui sont symétriques par rapport au centre ou au centre de gravité de l'outil.
  6. Procédé d'emboutissage d'une pièce
    - en mettant à disposition un outil qui a au moins deux points d'appui et
    - en appuyant l'outil par au moins deux dispositifs ( 12 , 14 ) de réglage sur les au moins deux points d'appui, caractérisé en ce que
    - on détermine des trajets ( x1 , x2 ) de réglage des dispositifs ( 12 , 14 ) de réglage,
    - on règle les dispositifs ( 12 , 14 ) de réglage au moyen de la différence des trajets ( x1 , x2 ) de réglage,
    - on détermine des forces ( F1, soll , F2, soll ) de réglage de consigne respectives des dispositifs ( 12 14 ) de réglage, d'une part à partir de la différence des trajets ( x1 , x2 ) de réglage et d'autre part, en outre, par une composante de la force (F∑,soll ) appliquée à la pièce par le dispositif de réglage, de manière à compenser une dissymétrie de charge de l'outil.
EP20110155585 2011-02-23 2011-02-23 Dispositif d'emboutissage d'une pièce Active EP2492027B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20110155585 EP2492027B1 (fr) 2011-02-23 2011-02-23 Dispositif d'emboutissage d'une pièce

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20110155585 EP2492027B1 (fr) 2011-02-23 2011-02-23 Dispositif d'emboutissage d'une pièce

Publications (2)

Publication Number Publication Date
EP2492027A1 EP2492027A1 (fr) 2012-08-29
EP2492027B1 true EP2492027B1 (fr) 2014-06-25

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Application Number Title Priority Date Filing Date
EP20110155585 Active EP2492027B1 (fr) 2011-02-23 2011-02-23 Dispositif d'emboutissage d'une pièce

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EP (1) EP2492027B1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB825711A (en) * 1955-07-20 1959-12-23 Us Industries Inc Improvements in or relating to hydraulic synchronizer
JPH0281799U (fr) * 1988-12-02 1990-06-25
DE102004049149A1 (de) * 2004-10-07 2006-04-13 Feintool International Management Ag Verfahren und Vorrichtung zum Herstellen und/oder Bearbeitung von Teilen
DE102007040286A1 (de) * 2007-08-24 2009-02-26 Wieber, Christian, Dipl.-Ing.(FH), Batu Caves Hydraulische Presse

Also Published As

Publication number Publication date
EP2492027A1 (fr) 2012-08-29

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