EP2687359B1 - Machine et procédé d'amélioration de la précision d'un mouvement non linéaire d'un élément de machine - Google Patents

Machine et procédé d'amélioration de la précision d'un mouvement non linéaire d'un élément de machine Download PDF

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Publication number
EP2687359B1
EP2687359B1 EP12176812.1A EP12176812A EP2687359B1 EP 2687359 B1 EP2687359 B1 EP 2687359B1 EP 12176812 A EP12176812 A EP 12176812A EP 2687359 B1 EP2687359 B1 EP 2687359B1
Authority
EP
European Patent Office
Prior art keywords
machine
eccentric
driven
machine element
linear motor
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.)
Not-in-force
Application number
EP12176812.1A
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German (de)
English (en)
Other versions
EP2687359A1 (fr
Inventor
Nikolaus Herdegen
Andreas Saffer
Elmar SCHÄFERS
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
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 Siemens AG filed Critical Siemens AG
Priority to EP12176812.1A priority Critical patent/EP2687359B1/fr
Publication of EP2687359A1 publication Critical patent/EP2687359A1/fr
Application granted granted Critical
Publication of EP2687359B1 publication Critical patent/EP2687359B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B30B1/266—Drive systems for the cam, eccentric or crank axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/42—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by magnetic means, e.g. electromagnetic

Definitions

  • the invention relates to a machine with an eccentric drive, wherein a first motor displaces an eccentric element in a rotational movement of a certain rotational direction and wherein the eccentric element drives a mechanically coupled to the eccentric element machine element and placed in a movement with periodically changing direction of movement. Furthermore, the invention relates to a method for improving the accuracy of a non-linear movement of a driven machine element of such a machine.
  • certain machine elements of a machine e.g. Tools
  • movements with periodically changing direction of motion This can e.g. be linear movements (up and down, back and forth), e.g. in a press cylinder of a press, or movements along a circular arc, e.g. with a cutting tool.
  • the drive is often done by means of an eccentric, in which one of a motor driven and rotating in a particular direction of rotation eccentric (eccentric, eccentric, eccentric rod, crank, etc.) by means of a suitable mechanism (push rod, towing crank, etc.), the rotating movement in the transmits desired movement with periodically changing direction of movement.
  • EP 2 174 748 A1 are known a machine tool and a method for damping vibrations of a machine element of a machine tool, in which a machine element by means of a first motor in a traversing direction via a gear is movable, wherein a second motor is provided, by means of which a force in the direction of travel of the machine element on the Machine element is exercisable.
  • the second motor is designed as a linear motor, which directly, that exerts a force between the engine and the machine element transmission, the force on the machine element.
  • a press with a cornering correction device which, in addition to a main drive, has an adjustment drive which can be used to dynamically change the press angle / ram stroke curve otherwise prescribed by the press kinematics.
  • this can be carried out a forming process in which the moving tool part of a forming tool at a speed of 0 or near 0, ie gently, touches the workpiece.
  • EP 1 892 083 A2 is a press known that is equipped for different applications (generating a high pressure or a very fast processing) with two linear motors with different properties.
  • the two linear motors can be controlled independently of each other.
  • the plunger is driven by two motors.
  • the second motor is used in particular to increase the speed of movement of the plunger in the working phases in which the press does not generate pressure.
  • the object of the present invention is to improve the accuracy of the movement of a machine element moved periodically with an alternating direction of movement.
  • the advantage of the invention is that the motion task is distributed to two drives.
  • a first motor rotates an eccentric member, i. in a rotating rotary motion of a certain direction of rotation.
  • the eccentric element is designed as an eccentric disc and has a specific flywheel.
  • the basic movement of the driven machine element is produced with periodically changing direction of movement. It can not be achieved, especially at high speeds, the desired accuracy of movement.
  • the desired accuracy is achieved by acting on the driven machine element, a linear motor.
  • a measuring system detects the movement of the driven machine element, compares the measured values with predetermined desired values and controls the linear motor via a drive control loop in such a way that it generates the force required to correct the movement. Since the basic movement already exists, acceleration or braking forces can not be applied by the linear motor for the basic movement. Only the forces for correcting the movement need to be generated.
  • the invention has the advantage that it achieves shorter cycle times during the movement of the driven machine element and thus increases the productivity of the machine compared to a machine with a conventional drive. Another advantage is the quick and easy changeability of the setpoint curves in the control compared to the hitherto necessary complex change of mechanical elements.
  • the forces for correcting the movement are only the inertial forces of the driven machine element.
  • the known principle of pulse decoupling is used in the inventive arrangement in the linear motor used.
  • the linear motor for correction can move the whole system (including the eccentric) and does not fight against the bearing forces with otherwise stiff mechanism, especially if the natural frequency of the overall structure below the speed of the first Motors is.
  • the rotor is attached directly to the driven machine element.
  • the driven machine element thus forms, as it were, the rotor of the linear motor.
  • mechanical fasteners can be omitted, whereby the movement of the driven machine element can be controlled even more accurately.
  • the dual function of the driven machine element leads to a reduction in space requirements and a cost reduction.
  • FIG. 1 a motor 1 puts an eccentric 2 in a rotational movement of a certain speed (rotational frequency).
  • a push rod 4 transmits the rotational movement of the eccentric disc 2 on a tool 3, which is guided by lateral guides 7 and therefore performs only a periodic up and down movement.
  • the tool 3 is, for example, a press cylinder of a press.
  • a rotor 5B of a linear motor is attached to the tool 3 according to the invention, which forms the linear motor 5A, 5B together with a stator 5A.
  • a control and regulating device 10 is provided, into which the actual value of the position of the tool 3 detected by means of a sensor 8 in conjunction with a scale 9 is received.
  • the control and regulating device 10 determines from a comparison of the actual value with a predetermined setpoint suitable operating parameters for controlling the linear motor 5A, 5B. Furthermore, the control and regulating device 10 also controls the rotational speed of the engine 1.
  • FIG. 1 slightly modified embodiment of the invention shows FIG. 2 ,
  • a push rod 4 'driven tool 3' for example, a cutting tool, a reciprocating motion (pivotal movement) along a circular path.
  • the tool 3 ' is connected to a rotor 5B', which together with a stator 5A 'forms a linear motor 5A', 5B '.
  • the exact position of the tool 3 ' is determined by means of a sensor 8' in conjunction with a scale 9 'and transmitted to a control and regulating device 10', which from a comparison with a desired value with respect to the current position control parameters for driving the linear motor 5A ', 5B' generated.
  • the embodiments of machines shown in principle with reference to the embodiments according to Figures 1 and 2 can be used in a variety of production machines, for example in textile, packaging or machine tools.
  • weaving machines the movement of the reed along a circular arc and that of the heddle linearly up and down.
  • knitting machines the movement of the needle bar with the knitting needles along a circular arc or linear or the movement of the needle hole along a circular arc with superimposed lateral deflection runs.
  • the advantages of the invention in these applications are an increase in productivity and flexibility.
  • FIG. 3 shows an example of the control engineering adaptation of the dynamic stiffness to an interference frequency.
  • IMC Internal Model Control
  • a disturbance variable can be described as a homogeneous solution of a differential equation, one can advantageously use a regulator which works according to the IMC principle.
  • the differential equation must then be integrated into the control algorithm. Stability and sufficient damping of the control loop must be ensured. It is finally achieved that for the disturbance frequency the control deviation disappears in the stationary state. For example, let f 0 be a critical interference frequency.

Claims (8)

  1. Machine à commande par excentrique, dans laquelle un premier moteur (1 ; 1') met un élément (2 ; 2') d'excentrique en un mouvement de rotation dans un sens déterminé, et dans lequel (2 ;2') l'excentrique entraîne un élément (3 ;3') de machine couplé mécaniquement à l'élément (2 ;2') d'excentrique et le met en un mouvement ayant un sens alternant périodiquement, l'élément (3 ; 3') de machine entraîné étant accouplé supplémentairement à au moins un moteur (5A, 5B ; 5A', 5B') linéaire,
    caractérisée en ce que le moteur (5A, 5B ; 5A', 5B') linéaire comprend un stator (5A ; 5A') et un rotor (5B ; 5B') et le rotor (5B ; 5B') est fixé directement à l'élément (3 ; 3') de machine entraîné et en ce que l'élément (2 ;2') d'excentrique est sous la forme d'un disque d'excentrique.
  2. Machine suivant la revendication 1, dans laquelle l'élément (2 ; 2') d'excentrique est monté souple.
  3. Machine suivant l'une des revendications précédentes, dans laquelle la commande par excentrique comporte au moins un élément élastique.
  4. Machine suivant l'une des revendications précédentes, dans laquelle la machine comprend au moins un élément (8 ; 8') de sonde, par lequel la position de l'élément (3 ; 3') de machine entraînée peut être détectée.
  5. Machine suivant l'une des revendications précédentes, dans laquelle la machine comprend au moins un dispositif (10; 10') de commande et de régulation, au moyen duquel le moteur (5; 5') linéaire peut être commandé de manière à ce qu'un écart de l'élément (3 ; 3') de machine à entraîner à une position de consigne pouvant être donnée à l'avance soit plus petit qu'une valeur de différence pouvant être donnée à l'avance.
  6. Procédé d'amélioration de la précision d'un mouvement non linéaire d'un élément (3 ; 3') de machine entraîné, dans lequel on donne par un premier moteur (1 ; 1') un mouvement de rotation dans un sens déterminé à un élément (2 ; 2') d'excentrique et dans lequel on entraîne par l'élément (2 ; 2') d'excentrique un élément (3 ; 3') de machine couplé mécaniquement à l'élément (2; 2') d'excentrique et on lui donne un mouvement ayant un sens alternant périodiquement, caractérisé en ce que l'on entraîne l'élément (3 ;3') de machine entraîné supplémentairement par un moteur (5A, 5B ; 5A',5B') linéaire, le moteur (5A, 5B ; 5A', 5B') linéaire comprenant un stator (5A ; 5A') et un rotor (5B ; 5B') et le rotor (5B ; 5B') étant fixé directement à l'élément (3 ; 3') de machine entraîné et en ce que l'élément (2 ; 2') d'excentrique est sous la forme d'un disque d'excentrique.
  7. Procédé suivant la revendication 6, dans lequel on entraîne le moteur (5A, 5B; 5A', 5B') linéaire au moyen d'un dispositif (10; 10') de régulation de manière à ce qu'un écart de l'élément (3;3') de machine entraîné à une position de consigne donnée à l'avance soit plus petit qu'une valeur de différence pouvant être donnée à l'avance.
  8. Procédé suivant la revendication 6 ou 7, dans lequel le dispositif (10; 10') de régulation exécute un algorithme de régulation, par lequel l'écart de la position de l'élément (3 ; 3') de machine entraîné à une position de consigne est minimisé pour une vitesse de consigne déterminée du premier moteur (1 ; 1').
EP12176812.1A 2012-07-18 2012-07-18 Machine et procédé d'amélioration de la précision d'un mouvement non linéaire d'un élément de machine Not-in-force EP2687359B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12176812.1A EP2687359B1 (fr) 2012-07-18 2012-07-18 Machine et procédé d'amélioration de la précision d'un mouvement non linéaire d'un élément de machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12176812.1A EP2687359B1 (fr) 2012-07-18 2012-07-18 Machine et procédé d'amélioration de la précision d'un mouvement non linéaire d'un élément de machine

Publications (2)

Publication Number Publication Date
EP2687359A1 EP2687359A1 (fr) 2014-01-22
EP2687359B1 true EP2687359B1 (fr) 2016-06-29

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Application Number Title Priority Date Filing Date
EP12176812.1A Not-in-force EP2687359B1 (fr) 2012-07-18 2012-07-18 Machine et procédé d'amélioration de la précision d'un mouvement non linéaire d'un élément de machine

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017004803A1 (de) * 2017-05-18 2018-11-22 Cosateq Gmbh Verfahren zum Betrieb einer Pulverpresse mit Lagenregelung und Pulverpresse zur Ausführung des Verfahrens
CN107350339A (zh) * 2017-07-14 2017-11-17 合肥雷呈信息技术有限公司 一种用于计算机主机外壳结构的冲孔装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6012322A (en) * 1998-03-27 2000-01-11 Aida Engineering Co., Ltd. Slide-driving device for knuckle presses
JP2003094197A (ja) * 2001-09-21 2003-04-02 Amada Eng Center Co Ltd プレス機械および同プレス機械を用いたプレス加工方法
DE102004003730A1 (de) * 2004-01-23 2005-08-18 Heinz Leiber Segmentmotor
BRPI0621324A2 (pt) * 2006-02-06 2011-12-06 Abb Research Ltd sistema de acionamento de prensa mecánica aperfeiçoado
JP2008043992A (ja) * 2006-08-21 2008-02-28 Murata Mach Ltd リニアモータ搭載プレス機械
DE102006056520A1 (de) * 2006-11-30 2008-06-05 Schuler Pressen Gmbh & Co. Kg Presse mit Kurvenkorrektur
EP2174748B1 (fr) 2008-10-10 2011-06-29 Siemens Aktiengesellschaft Machine-outil et procédé d'amortissement d'oscillations d'un élément de machine d'une machine-outil
DE102008064228A1 (de) * 2008-12-22 2010-07-08 Müller Weingarten AG Verfahren zum Betrieb eines Hammers
EP2319636B1 (fr) * 2009-11-10 2013-01-02 TRUMPF Werkzeugmaschinen GmbH + Co. KG Agencement d'entraînement de presse d'une machine-outil

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EP2687359A1 (fr) 2014-01-22

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