EP2457672B1 - Die cushion device - Google Patents

Die cushion device Download PDF

Info

Publication number
EP2457672B1
EP2457672B1 EP11008440.7A EP11008440A EP2457672B1 EP 2457672 B1 EP2457672 B1 EP 2457672B1 EP 11008440 A EP11008440 A EP 11008440A EP 2457672 B1 EP2457672 B1 EP 2457672B1
Authority
EP
European Patent Office
Prior art keywords
wedge
die cushion
cushion device
press
frame
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
EP11008440.7A
Other languages
German (de)
French (fr)
Other versions
EP2457672A1 (en
Inventor
Jürgen Henning
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.)
Germas AG
Original Assignee
Germas 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 Germas AG filed Critical Germas AG
Publication of EP2457672A1 publication Critical patent/EP2457672A1/en
Application granted granted Critical
Publication of EP2457672B1 publication Critical patent/EP2457672B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • B21D24/02—Die-cushions

Definitions

  • the invention relates to a die cushion device according to the preamble of the independent claim 1.
  • a die cushion device without active drive in which the holding force exerted by the pressure cheek against the press ram is generated by means of several spring assemblies.
  • the spring assemblies are arranged in the press table such that the spring force acts in the horizontal direction.
  • a wedge thruster By means of a wedge thruster, the horizontally acting spring force is deflected to the vertically movable pressure cheek of the die cushion device.
  • the holding force which is applied by the pressure cheek against the press ram is not adjustable in this device, but is defined by the spring constant of the spring assemblies used.
  • Die-cushion devices that allow control of the holding force, usually have a hydraulic drive.
  • a hydraulic drive is relatively expensive to implement and is usually only suitable for large presses or presses with high pressing pressures.
  • hydraulic drive presses and hydraulically driven die cushions are very large and therefore difficult to install, and also relatively expensive.
  • EP 1 082 185 B1 is an electrically operated deep drawing press known. Both the press ram and the die cushion device of this press are driven by four electrically operated spindle drives. This electric drive can be implemented relatively inexpensively and is particularly worthwhile for small presses. Of the Electric drive can also be controlled relatively easily and synchronously and thus allows a uniformly over the entire pressure surface generated pressing force. However, in contrast to conventional hydraulic drives electrically operated spindle drives are relatively slow, whereby the speed with which press ram or die cushion pressure cheek can be moved, is relatively limited.
  • a die cushion device is made JP 2003 211 231 A known.
  • the holding force which is applied in this device by the pressure cheek of the die cushion against the press ram of the press, is generated by a gas pressure cylinder.
  • the gas cylinder represents a closed system and is calibrated to a specific holding force. A regulation of the holding force during the press stroke of the press ram is therefore not possible.
  • the holding force is determined solely by how far the gas cylinder is pushed together during the pressing process.
  • the device comprises an adjusting mechanism for biasing the gas pressure cylinder or adjusting its vertical position relative to the vertically movable pressure cheek of the die cushion device, so that the holding force generated by the gas pressure cylinder can also be preset.
  • the adjusting mechanism comprises a wedge thrust gear, which is arranged below the gas pressure cylinder and below the pressure cheek and is driven by a hydraulic cylinder.
  • a disadvantage of this device is that the holding force acting from the pressure cheek of the die cushion device against the press ram of the press, during the pressing process can not be controlled.
  • each of the wedge thrust gear in each case comprises a first wedge, which is arranged above the vertically movable press ram and firmly connected to the frame of the press. This first wedge forms an inclined plane inclined relative to the horizontal.
  • each of the wedge thrust gears includes another wedge disposed between the first wedge and the press ram and movable with the aid of a linear electric motor along the inclined plane of the first wedge. The second wedge thus slides with its inclined top along the inclined plane of the first wedge and with its horizontally oriented bottom along the top of the press ram.
  • the second wedge is using of the electric motor between the first wedge, which is fixedly connected to the housing, and driven the press ram, so that the press ram moves in a pressing operation in the vertical direction downwards. Due to the fact that the second wedge can only have a limited length, the press ram in its lowermost position is no longer loaded uniformly but on one side by the second wedge offset relative to its starting position. For this reason, the press comprises a plurality of wedge thrust gears, which are offset from one another. For this reason and due to the large volume of construction is the off US 7,000,537 B2 known drive not suitable to be used as a drive for generating a holding force in a die cushion device that must be integrated in the most compact manner possible in the press table of a press.
  • the drive of a press ram can not be readily used in a die cushion device, since the drives of die cushion and press ram mostly different requirements are made. Press rams are usually controlled path-dependent, whereas the drive of a die cushion usually has to allow a force-dependent control.
  • the object is solved by the features of independent claim 1 of the present invention.
  • the invention is based on a die cushion device for a press, for regulating a holding force which is exerted by a pressure cheek on the press ram of the press.
  • the die cushion device further comprises a frame and a wedge thrust gear, wherein the holding force is adjustable by means of the wedge thruster.
  • the wedge thrust mechanism is driven by at least one linear electric motor, wherein the holding force during a Pressenhubs by controlling the linear electric motor is adjustable.
  • the combination of wedge thrust and linear electric motor allows rapid movement of the pressure cheek of the die cushion device, whereby the productivity of a press with a die cushion device according to the invention is in a range that otherwise can only be achieved with expensive hydraulic drives.
  • the drive with a linear electric motor allows easy control and is easy and inexpensive to implement. Since linear electric motors can muster only a limited force, the required reduction is implemented with a wedge slide.
  • a moving component is to be understood, by means of which a holding force can be exerted on the press ram of the press.
  • This component may for example be a bolt with, if necessary, attached tool.
  • the at least one linear electric motor is the only drive mode of the die cushion device for generating the holding force.
  • the drive then builds very compact and can be controlled very accurately.
  • the wedge push gear comprises a first wedge with a first wedge surface and a second wedge with a second wedge surface, wherein the pressure cheek is connected to the first wedge, the first wedge is slidably mounted in the frame in the direction of action of the holding force, and the second wedge along an adjustment direction, which has an angle to the effective direction of the holding force, is mounted displaceably in the frame.
  • the first wedge surface and the second wedge surface are facing each other, so that a movement of the second wedge in the adjustment causes a movement of the first wedge in the effective direction of the holding force.
  • the upper part of the die cushion apparatus can be kept very compact, whereby the die cushion device can be very easily integrated into the press table of a press. In terms of a compact design, it is advantageous if only a single wedge thrust gear is provided with a first wedge and a second wedge.
  • the adjustment direction is horizontal.
  • very little space in the vertical direction is required for accommodating the linear electric motor or motors. Again, this has a positive effect on the integration of the die cushion device in the press table of a press.
  • the linear electric motor comprises a stator and a rotor, wherein the stator with the frame and the rotor are connected to the second wedge.
  • the frame of the die cushion device is fixed, that is firmly connected to the housing of the press. Therefore, when the stator of the linear electric motor is connected to the frame, the wiring of the linear electric motor is also easy. There is no need to provide a flexible supply line.
  • At least one rolling guide is provided in each case between the second wedge and the frame, and between the first wedge surface and the second wedge surface.
  • sliding guides are also possible instead of rolling guides, but with rolling guides the friction is reduced and the stability and ease of movement are increased.
  • At least one rolling guide is provided between the first wedge and the frame.
  • This type of storage offers compared to pure guide surfaces or against sliding guides o.g. Advantages.
  • the die cushion apparatus further comprises a control of the linear electric motor.
  • the die cushion device further comprises a path measuring system for detecting the position of the pressure cheek.
  • the displacement measuring system can be realized for example by a clock and a sensor. Both magnetic and optical or inductive sensors are suitable.
  • the sensor is fixed to the frame, whereby the wiring of the sensor is simple and does not have to be designed flexibly.
  • the clock which is scanned by the sensor, may be mounted on the pressure cheek itself or on the first wedge or possibly also on the second wedge. In the latter case, the Position of the pressure cheek calculated using the reduction ratio of the wedge push gear.
  • a sensor or displacement measuring system and the linear electric motor itself can be used as a so-called integrated sensor.
  • the die cushion apparatus further comprises a pressure sensor for detecting the holding force.
  • a pressure sensor allows a force-dependent control of the die cushion device. This sensor can be integrated in the pressure cheek, for example in a pin of the pressure cheek or in an attached tool.
  • the invention also provides a press with a press table, a press ram, and a die cushion apparatus according to the invention in which the frame of the die cushion apparatus is integrated with and connected to the press table.
  • the frame of the die cushion device can be both fixedly connected to the press table and, for example, in the horizontal direction, adjustable.
  • FIG. 1 shows a front view of a press 2 with a die cushion device according to the invention 1.
  • the press 2 comprises a press table 23 and a press ram 3, which is movable relative to the press table 23 in the vertical direction by means of the threaded spindles 24.
  • Each threaded spindle 24 is assigned a spindle drive 25 for this purpose.
  • the press table 23 is shown partially cut so that the die cushion device 1 integrated in the press table 23 is visible.
  • the frame 4 of the invention is shown partially cut so that the die cushion device 1 integrated in the press table 23 is visible.
  • Cushioning device 1 is connected to the press table 23.
  • the wedge thrust gear 5 of the die cushion device 1 which forms the drive of the existing of the bolt 7 and the tool 8 pressure cheek.
  • the bolt 7 can be moved in the vertical direction with the help of the wedge thruster 5 and protrudes in the case shown from the top of the press table 23 also. Between the patch on the bolt 7 tool 8 and the press ram 3, a sheet is clamped in a deep drawing process.
  • FIG. 1 illustrated die cushion device 1 is slightly larger in FIG. 2 shown.
  • the view corresponds to a section along the in FIG. 3 drawn section line 11.
  • FIG. 3 turn is a cut along in FIG. 2 illustrated section line III.
  • the bolt 7 is in the frame 4 of the die cushion device 1 in the vertical direction, which corresponds to the effective direction 13 of the bolt 7 applied to the press ram 3 holding force, out.
  • the patch on the bolt 7 tool 8 is in the Figures 2 and 3 not shown. It should also be noted that the FIGS. 1 to 3 only represent schematic representations of the die cushion device according to the invention.
  • the first wedge 9 is the same as the bolt 7 in the vertical direction 13 in the frame 4 out. Shown are only lateral guide surfaces, but also rolling bearings or plain bearings between the frame 4 and the first wedge 9 may be provided.
  • the underside of the first wedge 9, hereinafter referred to as the first wedge surface lies in an inclined plane which has an angle of approximately 5 ° relative to the horizontal. The reduction ratio of the wedge thruster 5 is determined by this angle. This angle is preferably in a range between 3 ° and 8 °.
  • the first wedge surface is designated by the reference numeral 11.
  • a second wedge 10 is arranged, which is mounted in the horizontal adjustment 14 movable in the frame 4.
  • two Wälz exchangeen 17 are arranged between the horizontally oriented bottom of the second wedge 10 and the bottom plate 26 of the frame 4.
  • the upper side 12 of the second wedge 10 hereinafter referred to as the second wedge surface, runs parallel to the first wedge surface 11 of the first wedge 9.
  • two rolling guides 18 are likewise arranged.
  • the second wedge 10 serve two linear electric motors 6, which, as in FIG. 3 are arranged on both sides of the second wedge 10 between the frame 4 and the wedge 10.
  • the stators 15 of the two linear electric motors 6 are firmly connected to the frame 4, the rotor 16 of the two motors are mounted on the wedge 10.
  • the die-cushion device 1 further comprises a controller 19, with which the two linear electric motors 6 are driven.
  • the controller 19 allows both a path-dependent and a force-dependent control of the die cushion device.
  • the controller 19 must be able to detect the position of the bolt 7 and the position of the first wedge 9.
  • a timing ruler 20 is attached to the bolt 7, which is scanned via the sensor 21.
  • the system also allows a force-dependent control, in which case the force acting between the bolt 7 and the press ram 3 must be measured.
  • the die-cushion device 1 comprises a pressure sensor 22 which is integrated in the bolt 7. The signals of the sensors 21 and 22 are read out by the controller 19 and evaluated.

Description

Die Erfindung betrifft eine Ziehkissen-Vorrichtung nach dem Oberbegriff des unabhängigen Anspruchs 1.The invention relates to a die cushion device according to the preamble of the independent claim 1.

In der Umformtechnik werden mechanische und hydraulische Pressen zur Bearbeitung von Werkstücken und insbesondere Blechteilen eingesetzt. Zum Umformen von Ziehteilen ist es erforderlich, das umzuformende Blech in spezieller Weise zwischen dem Oberwerkzeug der Presse, auch Pressenstößel genannt, und dem Unterwerkzeug der Presse einzuspannen. Hierzu kommen Ziehkissen-Vorrichtungen zum Einsatz, mit Hilfe derer während des Pressenhubs des Pressenstößels eine Haltekraft auf den Pressenstößel ausgeübt werden kann. Das tiefzuziehende Blech wird dabei zumeist am Rand bzw. partiell von einer sogenannten Druckwange der Ziehkissen-Vorrichtung gegen den Pressenstößel gepresst. Die Druckwange bewegt sich in der Regel gleichförmig mit dem Pressenstößel mit.In forming technology, mechanical and hydraulic presses are used to machine workpieces and especially sheet metal parts. For forming drawn parts, it is necessary to clamp the metal to be formed in a special way between the upper tool of the press, also called press ram, and the lower tool of the press. For this purpose, die cushion devices are used, by means of which a holding force can be exerted on the press ram during the press stroke of the press ram. The deep-drawn sheet is usually pressed at the edge or partially by a so-called pressure cheek of the die cushion device against the press ram. The pressure cheek usually moves along with the press ram in a uniform manner.

Aus DE 2 007 724 A ist beispielsweise eine Ziehkissen-Vorrichtung ohne aktiven Antrieb bekannt, bei der die Haltekraft, die von der Druckwange gegen den Pressenstößel ausgeübt wird, mittels mehrerer Federpakete erzeugt wird. Die Federpakete sind im Pressentisch derart angeordnet, dass die Federkraft in horizontaler Richtung wirkt. Mittels eines Keilschubgetriebes wird die horizontal wirkende Federkraft umgelenkt auf die vertikal verfahrbare Druckwange der Ziehkissen-Vorrichtung. Die Haltekraft, die von der Druckwange gegen den Pressenstößel aufgebracht wird, ist bei dieser Vorrichtung nicht regelbar, sondern definiert sich über die Federkonstante der verwendeten Federpakete.Out DE 2 007 724 A For example, a die cushion device without active drive is known in which the holding force exerted by the pressure cheek against the press ram is generated by means of several spring assemblies. The spring assemblies are arranged in the press table such that the spring force acts in the horizontal direction. By means of a wedge thruster, the horizontally acting spring force is deflected to the vertically movable pressure cheek of the die cushion device. The holding force which is applied by the pressure cheek against the press ram is not adjustable in this device, but is defined by the spring constant of the spring assemblies used.

Ziehkissen-Vorrichtungen, die eine Regelung der Haltekraft erlauben, weisen zumeist einen hydraulischen Antrieb auf. Ein hydraulischer Antrieb ist jedoch relativ aufwendig zu realisieren und eignet sich in der Regel nur für große Pressen bzw. Pressen mit hohen Pressdrücken. Pressen mit hydraulischem Antrieb und hydraulisch angetriebenem Ziehkissen sind zudem sehr groß und daher schwierig zu installieren, und außerdem vergleichsweise teuer.Die-cushion devices that allow control of the holding force, usually have a hydraulic drive. However, a hydraulic drive is relatively expensive to implement and is usually only suitable for large presses or presses with high pressing pressures. In addition, hydraulic drive presses and hydraulically driven die cushions are very large and therefore difficult to install, and also relatively expensive.

Aus EP 1 082 185 B1 ist eine elektrisch betriebene Tiefziehpresse bekannt. Sowohl der Pressenstößel als auch die Ziehkissen-Vorrichtung dieser Presse sind über jeweils vier elektrisch betriebene Spindelantriebe angetrieben. Dieser elektrische Antrieb lässt sich relativ kostengünstig realisieren und lohnt sich insbesondere bei kleinen Pressen. Der elektrische Antrieb lässt sich auch relativ problemlos und synchron ansteuern und ermöglicht somit eine gleichmäßig über die gesamte Druckfläche erzeugte Presskraft. Insbesondere gegenüber herkömmlichen hydraulischen Antrieben sind elektrisch betriebene Spindelantriebe jedoch relativ langsam, wodurch die Geschwindigkeit, mit der Pressenstößel bzw. Ziehkissen-Druckwange bewegt werden können, relativ stark limitiert ist.Out EP 1 082 185 B1 is an electrically operated deep drawing press known. Both the press ram and the die cushion device of this press are driven by four electrically operated spindle drives. This electric drive can be implemented relatively inexpensively and is particularly worthwhile for small presses. Of the Electric drive can also be controlled relatively easily and synchronously and thus allows a uniformly over the entire pressure surface generated pressing force. However, in contrast to conventional hydraulic drives electrically operated spindle drives are relatively slow, whereby the speed with which press ram or die cushion pressure cheek can be moved, is relatively limited.

Ziehkissen-Vorrichtungen mit Spindelantrieb sind auch aus EP 1741500 A1 und DE 1020010004989 A1 bekannt.Cushioning devices with spindle drive are also off EP 1741500 A1 and DE 1020010004989 A1 known.

Eine Ziehkissen-Vorrichtung nach dem Oberbegriff des unabhängigen Anspruchs 1 ist aus JP 2003 211 231 A bekannt. Die Haltekraft, die bei dieser Vorrichtung von der Druckwange des Ziehkissens gegen den Pressenstößel der Presse aufgebracht wird, wird mit einem Gasdruckzylinder erzeugt. Der Gasdruckzylinder stellt ein abgeschlossenes System dar und ist auf eine bestimmte Haltekraft kalibriert. Eine Regelung der Haltekraft während des Pressenhubs des Pressenstößels ist daher nicht möglich. Die Haltekraft bestimmt sich ganz allein dadurch, wie weit der Gasdruckzylinder beim Pressvorgang zusammengeschoben wird. Die Vorrichtung umfasst einen Verstellmechanismus, um den Gasdruckzylinder vorzuspannen bzw. dessen vertikale Position relativ zur vertikal verfahrbaren Druckwange der Ziehkissen-Vorrichtung einzustellen, so dass auch die vom Gasdruckzylinder erzeugte Haltekraft voreingestellt werden kann. Der Verstellmechanismus umfasst ein Keilschubgetriebe, das unterhalb des Gasdruckzylinders sowie unterhalb der Druckwange angeordnet ist und von einem Hydraulikzylinder angetrieben wird. Nachteilig bei dieser Vorrichtung ist, dass die Haltekraft, die von der Druckwange der Ziehkissen-Vorrichtung gegen den Pressenstößel der Presse wirkt, während des Press-vorgangs nicht geregelt werden kann.A die cushion device according to the preamble of independent claim 1 is made JP 2003 211 231 A known. The holding force, which is applied in this device by the pressure cheek of the die cushion against the press ram of the press, is generated by a gas pressure cylinder. The gas cylinder represents a closed system and is calibrated to a specific holding force. A regulation of the holding force during the press stroke of the press ram is therefore not possible. The holding force is determined solely by how far the gas cylinder is pushed together during the pressing process. The device comprises an adjusting mechanism for biasing the gas pressure cylinder or adjusting its vertical position relative to the vertically movable pressure cheek of the die cushion device, so that the holding force generated by the gas pressure cylinder can also be preset. The adjusting mechanism comprises a wedge thrust gear, which is arranged below the gas pressure cylinder and below the pressure cheek and is driven by a hydraulic cylinder. A disadvantage of this device is that the holding force acting from the pressure cheek of the die cushion device against the press ram of the press, during the pressing process can not be controlled.

Aus US 7,000,537 B2 ist eine einfache Presse bekannt, deren Stößel elektromotorisch angetrieben wird. Der Antrieb umfasst mehrere Keilschubgetriebe, die jeweils über einen Linear-Elektromotor angetrieben werden. Jedes der Keilschubgetriebe umfasst dabei jeweils einen ersten Keil, der über dem vertikal verfahrbaren Pressenstößel angeordnet und fest mit dem Rahmen der Presse verbunden ist. Dieser erste Keil bildet eine gegenüber der Horizontalen geneigte schiefe Ebene. Ferner umfasst jedes der Keilschubgetriebe einen weiteren Keil, der zwischen dem ersten Keil und dem Pressenstößel angeordnet ist und mit Hilfe eines Linear-Elektromotors entlang der schiefen Ebene des ersten Keils bewegt werden kann. Der zweite Keil gleitet somit mit seiner schiefen Oberseite entlang der schiefen Ebene des ersten Keils und mit seiner horizontal ausgerichteten Unterseite entlang der Oberseite des Pressenstößels. Mit anderen Worten wird der zweite Keil mit Hilfe des Elektromotors zwischen den ersten Keil, der fest mit dem Gehäuse verbunden ist, und den Pressenstößel getrieben, so dass sich der Pressenstößel bei einem Pressvorgang in vertikaler Richtung nach unten bewegt. Dadurch, dass der zweite Keil nur eine begrenzte Länge aufweisen kann, wird der Pressenstößel in seiner untersten Position nicht mehr gleichmäßig sondern einseitig durch den gegenüber seiner Ausgangsposition versetzten zweiten Keil belastet. Aus diesem Grund umfasst die Presse mehrere Keilschubgetriebe, die versetzt zueinander angeordnet sind. Aus diesem Grund und aufgrund des großen Bauvolumens ist der aus US 7,000,537 B2 bekannte Antrieb nicht dafür geeignet, bei einer Ziehkissen-Vorrichtung, die in möglichst kompakter Art und Weise in den Pressentisch einer Presse integriert werden muss, als Antrieb zur Erzeugung einer Haltekraft verwendet zu werden. Generell kann der Antrieb eines Pressenstößels nicht ohne Weiteres in einer Ziehkissen-Vorrichtung verwendet werden, da an die Antriebe von Ziehkissen und Pressenstößel zumeist unterschiedliche Anforderungen gestellt werden. Pressenstößel werden zumeist wegabhängig gesteuert, wohingegen der Antrieb eines Ziehkissens in der Regel eine kraftabhängige Steuerung zulassen muss.Out US 7,000,537 B2 is a simple press known, the plunger is driven by an electric motor. The drive includes several wedge thrusters, each driven by a linear electric motor. Each of the wedge thrust gear in each case comprises a first wedge, which is arranged above the vertically movable press ram and firmly connected to the frame of the press. This first wedge forms an inclined plane inclined relative to the horizontal. Further, each of the wedge thrust gears includes another wedge disposed between the first wedge and the press ram and movable with the aid of a linear electric motor along the inclined plane of the first wedge. The second wedge thus slides with its inclined top along the inclined plane of the first wedge and with its horizontally oriented bottom along the top of the press ram. In other words, the second wedge is using of the electric motor between the first wedge, which is fixedly connected to the housing, and driven the press ram, so that the press ram moves in a pressing operation in the vertical direction downwards. Due to the fact that the second wedge can only have a limited length, the press ram in its lowermost position is no longer loaded uniformly but on one side by the second wedge offset relative to its starting position. For this reason, the press comprises a plurality of wedge thrust gears, which are offset from one another. For this reason and due to the large volume of construction is the off US 7,000,537 B2 known drive not suitable to be used as a drive for generating a holding force in a die cushion device that must be integrated in the most compact manner possible in the press table of a press. In general, the drive of a press ram can not be readily used in a die cushion device, since the drives of die cushion and press ram mostly different requirements are made. Press rams are usually controlled path-dependent, whereas the drive of a die cushion usually has to allow a force-dependent control.

Es ist Aufgabe der vorliegenden Erfindung, bei einer Ziehkissen-Vorrichtung der eingangs genannten Art eine Lösung anzugeben, die eine kompakte Bauweise sowie leichte Integration der Ziehkissen-Vorrichtung in eine Presse zulässt, wobei der Antrieb der Ziehkissen-Vorrichtung zudem günstig zu realisieren und leicht steuerbar sein soll. Zudem soll der Antrieb der Ziehkissen-Vorrichtung eine schnelle Bewegung der Ziehkissen-Druckwange ermöglichen.It is an object of the present invention to provide a solution in a die cushion device of the type mentioned, which allows a compact design and easy integration of the die cushion device in a press, the drive of the die cushion device also to realize low and easily controllable should be. In addition, the drive of the die cushion device to allow rapid movement of the die cushion cheek.

Die Aufgabe wird gelöst durch die Merkmale des unabhängigen Anspruchs 1 der vorliegenden Erfindung. Die Erfindung geht aus von einer Ziehkissen-Vorrichtung für eine Presse, zur Regelung einer Haltekraft, die von einer Druckwange auf den Pressenstößel der Presse ausgeübt wird. Neben der Druckwange umfasst die Ziehkissen-Vorrichtung ferner einen Rahmen und ein Keilschubgetriebe, wobei die Haltekraft mittels des Keilschubgetriebes verstellbar ist. Erfindungsgemäß ist das Keilschubgetriebe von zumindest einem Linear-Elektromotor angetrieben, wobei die Haltekraft während eines Pressenhubs durch Steuerung des Linear-Elektromotors regelbar ist.The object is solved by the features of independent claim 1 of the present invention. The invention is based on a die cushion device for a press, for regulating a holding force which is exerted by a pressure cheek on the press ram of the press. In addition to the pressure cheek, the die cushion device further comprises a frame and a wedge thrust gear, wherein the holding force is adjustable by means of the wedge thruster. According to the wedge thrust mechanism is driven by at least one linear electric motor, wherein the holding force during a Pressenhubs by controlling the linear electric motor is adjustable.

Die Kombination aus Keilschubgetriebe und Linear-Elektromotor ermöglicht eine schnelle Bewegung der Druckwange der Ziehkissen-Vorrichtung, wodurch die Produktivität einer Presse mit einer erfindungsgemäßen Ziehkissen-Vorrichtung in einem Bereich liegt, der sonst nur mit teuren hydraulischen Antrieben erreicht werden kann. Der Antrieb mit einem Linear-Elektromotor ermöglicht eine leichte Steuerung und ist einfach und kostengünstig zu realisieren. Da Linear-Elektromotoren nur eine begrenzte Kraft aufbringen können, wird die erforderliche Untersetzung mit einem Keilschubgetriebe umgesetzt.The combination of wedge thrust and linear electric motor allows rapid movement of the pressure cheek of the die cushion device, whereby the productivity of a press with a die cushion device according to the invention is in a range that otherwise can only be achieved with expensive hydraulic drives. The drive with a linear electric motor allows easy control and is easy and inexpensive to implement. Since linear electric motors can muster only a limited force, the required reduction is implemented with a wedge slide.

Unter der Druckwange der erfindungsgemäßen Ziehkissen-Vorrichtung soll lediglich ein bewegtes Bauteil verstanden werden, mit Hilfe dessen eine Haltekraft auf den Pressenstößel der Presse ausgeübt werden kann. Dieses Bauteil kann beispielsweise ein Bolzen mit, falls erforderlich, aufgesetztem Werkzeug sein.Under the pressure cheek of the die cushion device according to the invention, only a moving component is to be understood, by means of which a holding force can be exerted on the press ram of the press. This component may for example be a bolt with, if necessary, attached tool.

Vorteilhafte Ausgestaltungen der vorliegenden Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the present invention are the subject of the dependent claims.

In einer besonders bevorzugten Ausführungsform der vorliegenden Erfindung stellt der zumindest eine Linear-Elektromotor die einzige Antriebsart der Ziehkissen-Vorrichtung zur Erzeugung der Haltekraft dar. Der Antrieb baut dann sehr kompakt und lässt sich sehr genau steuern.In a particularly preferred embodiment of the present invention, the at least one linear electric motor is the only drive mode of the die cushion device for generating the holding force. The drive then builds very compact and can be controlled very accurately.

In einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung umfasst das Keilschubgetriebe einen ersten Keil mit einer ersten Keilfläche und einen zweiten Keil mit einer zweiten Keilfläche, wobei die Druckwange mit dem ersten Keil verbunden ist, der erste Keil in Wirkrichtung der Haltekraft verschieblich im Rahmen gelagert ist, und der zweite Keil entlang einer Verstellrichtung, die zur Wirkrichtung der Haltekraft einen Winkel aufweist, verschieblich im Rahmen gelagert ist. Die erste Keilfläche und die zweite Keilfläche sind dabei einander zugewandt, so dass eine Bewegung des zweiten Keils in Verstellrichtung eine Bewegung des ersten Keils in Wirkrichtung der Haltekraft bewirkt. Bei diesem Aufbau des Keilschubgetriebes kann insbesondere der obere Teil der Ziehkissen-Vorrichtung sehr kompakt gehalten werden, wodurch sich die Ziehkissen-Vorrichtung sehr leicht in den Pressentisch einer Presse integrieren lässt. Im Sinne einer kompakten Bauweise ist es vorteilhaft, wenn lediglich ein einzelnes Keilschubgetriebe mit einem ersten Keil und einem zweiten Keil vorgesehen ist.In a further preferred embodiment of the present invention, the wedge push gear comprises a first wedge with a first wedge surface and a second wedge with a second wedge surface, wherein the pressure cheek is connected to the first wedge, the first wedge is slidably mounted in the frame in the direction of action of the holding force, and the second wedge along an adjustment direction, which has an angle to the effective direction of the holding force, is mounted displaceably in the frame. The first wedge surface and the second wedge surface are facing each other, so that a movement of the second wedge in the adjustment causes a movement of the first wedge in the effective direction of the holding force. In this construction of the wedge thruster, in particular, the upper part of the die cushion apparatus can be kept very compact, whereby the die cushion device can be very easily integrated into the press table of a press. In terms of a compact design, it is advantageous if only a single wedge thrust gear is provided with a first wedge and a second wedge.

Ebenfalls im Sinne einer kompakten Bauweise und guten Integration in den Pressentisch einer Presse ist es, wenn Verstellrichtung und Wirkrichtung aufeinander senkrecht stehen. Gleichzeitig wirkt sich dies günstig auf die Belastung der Keillagerung und die Leichtgängigkeit des Keilschubgetriebes aus.Also in the sense of a compact design and good integration in the press table of a press, it is when adjustment and direction of action are perpendicular to each other. At the same time, this has a favorable effect on the stress of the wedge bearing and the ease of wedge thruster.

Vorteilhafterweise ist die Verstellrichtung horizontal. Dadurch wird für die Unterbringung des oder der Linear-Elektromotoren sehr wenig Platz in vertikaler Richtung benötigt. Auch dies wirkt sich wiederum positiv auf die Integration der Ziehkissen-Vorrichtung in den Pressentisch einer Presse aus.Advantageously, the adjustment direction is horizontal. As a result, very little space in the vertical direction is required for accommodating the linear electric motor or motors. Again, this has a positive effect on the integration of the die cushion device in the press table of a press.

In einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung umfasst der Linear-Elektromotor einen Stator und einen Läufer, wobei der Stator mit dem Rahmen und der Läufer mit dem zweiten Keil verbunden sind. In der Regel ist der Rahmen der Ziehkissen-Vorrichtung feststehend, das heißt fest mit dem Gehäuse der Presse verbunden. Wenn der Stator des Linear-Elektromotors mit dem Rahmen verbunden ist, gestaltet sich daher auch die Verkabelung des Linear-Elektromotors einfach. Es muss keine flexible Zuleitung vorgesehen werden.In a further preferred embodiment of the present invention, the linear electric motor comprises a stator and a rotor, wherein the stator with the frame and the rotor are connected to the second wedge. In general, the frame of the die cushion device is fixed, that is firmly connected to the housing of the press. Therefore, when the stator of the linear electric motor is connected to the frame, the wiring of the linear electric motor is also easy. There is no need to provide a flexible supply line.

In einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung ist jeweils zumindest eine Wälzführung zwischen dem zweiten Keil und dem Rahmen, und zwischen erster Keilfläche und zweiter Keilfläche vorgesehen. Prinzipiell sind statt Wälzführungen auch Gleitführungen möglich, jedoch wird mit Wälzführungen die Reibung verringert und die Stabilität und Leichtgängigkeit erhöht.In a further preferred embodiment of the present invention, at least one rolling guide is provided in each case between the second wedge and the frame, and between the first wedge surface and the second wedge surface. In principle, sliding guides are also possible instead of rolling guides, but with rolling guides the friction is reduced and the stability and ease of movement are increased.

Vorteilhafterweise ist auch zwischen dem ersten Keil und dem Rahmen zumindest eine Wälzführung vorgesehen. Auch diese Art der Lagerung bietet gegenüber reinen Führungsflächen bzw. gegenüber Gleitführungen die o.g. Vorteile.Advantageously, at least one rolling guide is provided between the first wedge and the frame. This type of storage offers compared to pure guide surfaces or against sliding guides o.g. Advantages.

In einer weiteren besonders bevorzugten Ausführungsform der vorliegenden Erfindung umfasst die Ziehkissen-Vorrichtung ferner eine Steuerung des Linear-Elektromotors. Dadurch können entweder die Position der Druckwange oder die Haltekraft, die von der Druckwange auf den Pressenstößel der Presse ausgeübt wird, gezielt gesteuert werden.In a further particularly preferred embodiment of the present invention, the die cushion apparatus further comprises a control of the linear electric motor. As a result, either the position of the pressure cheek or the holding force exerted by the pressure cheek on the press ram of the press can be controlled selectively.

Vorteilhafterweise umfasst die Ziehkissen-Vorrichtung dazu ferner ein Wegmesssystem zur Erfassung der Position der Druckwange. Dadurch ist eine wegabhängige Steuerung der Druckwange möglich. Das Wegmesssystem kann beispielsweise durch einen Taktgeber sowie einen Sensor realisiert sein. Es eignen sich sowohl magnetische als auch optische oder induktive Sensoren. Vorteilhafterweise ist der Sensor am Rahmen fixiert, wodurch die Verkabelung des Sensors einfach ist und nicht flexibel gestaltet sein muss. Der Taktgeber, der vom Sensor abgetastet wird, kann an der Druckwange selbst oder auf dem ersten Keil bzw. ggf. auch auf dem zweiten Keil angebracht sein. Im letzten Fall wird die Position der Druckwange über das Untersetzungsverhältnis des Keilschubgetriebes berechnet. Als Sensor bzw. Wegmesssystem kann auch der Linear-Elektromotor selbst als sogenannter integrierter Sensor" verwendet werden.Advantageously, the die cushion device further comprises a path measuring system for detecting the position of the pressure cheek. As a result, a path-dependent control of the pressure cheek is possible. The displacement measuring system can be realized for example by a clock and a sensor. Both magnetic and optical or inductive sensors are suitable. Advantageously, the sensor is fixed to the frame, whereby the wiring of the sensor is simple and does not have to be designed flexibly. The clock, which is scanned by the sensor, may be mounted on the pressure cheek itself or on the first wedge or possibly also on the second wedge. In the latter case, the Position of the pressure cheek calculated using the reduction ratio of the wedge push gear. As a sensor or displacement measuring system and the linear electric motor itself can be used as a so-called integrated sensor.

In einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung umfasst die Ziehkissen-Vorrichtung ferner einen Drucksensor zur Erfassung der Haltekraft. Ein Drucksensor erlaubt eine kraftabhängige Steuerung der Ziehkissen-Vorrichtung. Dieser Sensor kann in die Druckwange, beispielsweise in einen Bolzen der Druckwange oder in ein aufgesetztes Werkzeug integriert sein.In a further preferred embodiment of the present invention, the die cushion apparatus further comprises a pressure sensor for detecting the holding force. A pressure sensor allows a force-dependent control of the die cushion device. This sensor can be integrated in the pressure cheek, for example in a pin of the pressure cheek or in an attached tool.

Die Erfindung stellt auch eine Presse mit einem Pressentisch, einem Pressenstößel und einer erfindungsgemäßen Ziehkissen-Vorrichtung bereit, bei welcher der Rahmen der Ziehkissen-Vorrichtung in den Pressentisch integriert und mit diesem verbunden ist. Der Rahmen der Ziehkissen-Vorrichtung kann sowohl fest mit dem Pressentisch verbunden als auch, beispielsweise in horizontaler Richtung, verstellbar sein.The invention also provides a press with a press table, a press ram, and a die cushion apparatus according to the invention in which the frame of the die cushion apparatus is integrated with and connected to the press table. The frame of the die cushion device can be both fixedly connected to the press table and, for example, in the horizontal direction, adjustable.

Ein bevorzugtes Ausführungsbeispiel der vorliegenden Erfindung wird im Folgenden anhand von Zeichnungen näher erläutert. Es zeigen:

Figur 1
eine Presse mit einer erfindungsgemäßen Ziehkissen-Vorrichtung,
Figur 2
eine Detailansicht der Ziehkissen-Vorrichtung aus Figur 1 in einer geschnittenen Vorderansicht, und
Figur 3
eine Seitenansicht der erfindungsgemäßen Ziehkissen-Vorrichtung aus Figur 2, ebenfalls im Schnitt.
A preferred embodiment of the present invention will be explained in more detail below with reference to drawings. Show it:
FIG. 1
a press with a die-cushion device according to the invention,
FIG. 2
a detailed view of the die cushion device FIG. 1 in a cut front view, and
FIG. 3
a side view of the die cushion device according to the invention FIG. 2 , also in section.

Für die folgenden Ausführungen gilt, dass gleiche Teile mit gleichen Bezugszeichen bezeichnet sind.For the following statements applies that the same parts are designated by the same reference numerals.

Figur 1 zeigt eine Vorderansicht einer Presse 2 mit einer erfindungsgemäßen Ziehkissen-Vorrichtung 1. Die Presse 2 umfasst einen Pressentisch 23 und einen Pressenstößel 3, der mit Hilfe der Gewindespindeln 24 relativ zum Pressentisch 23 in vertikaler Richtung verfahrbar ist. Jeder Gewindespindel 24 ist hierzu ein Spindelantrieb 25 zugeordnet. FIG. 1 shows a front view of a press 2 with a die cushion device according to the invention 1. The press 2 comprises a press table 23 and a press ram 3, which is movable relative to the press table 23 in the vertical direction by means of the threaded spindles 24. Each threaded spindle 24 is assigned a spindle drive 25 for this purpose.

Der Pressentisch 23 ist teilweise geschnitten dargestellt, so dass die im Pressentisch 23 integrierte Ziehkissen-Vorrichtung 1 sichtbar ist. Der Rahmen 4 der erfindungsgemäßenThe press table 23 is shown partially cut so that the die cushion device 1 integrated in the press table 23 is visible. The frame 4 of the invention

Ziehkissen-Vorrichtung 1 ist mit dem Pressentisch 23 verbunden. Im Rahmen 4 befindet sich das Keilschubgetriebe 5 der Ziehkissen-Vorrichtung 1, das den Antrieb der aus dem Bolzen 7 und dem Werkzeug 8 bestehenden Druckwange bildet. Der Bolzen 7 kann mit Hilfe des Keilschubgetriebes 5 in vertikaler Richtung verfahren werden und ragt im dargestellten Fall aus der Oberseite des Pressentischs 23 hinaus. Zwischen dem auf den Bolzen 7 aufgesetzten Werkzeug 8 und dem Pressenstößel 3 wird bei einem Tiefziehvorgang ein Blech eingespannt.Cushioning device 1 is connected to the press table 23. In the frame 4 is the wedge thrust gear 5 of the die cushion device 1, which forms the drive of the existing of the bolt 7 and the tool 8 pressure cheek. The bolt 7 can be moved in the vertical direction with the help of the wedge thruster 5 and protrudes in the case shown from the top of the press table 23 also. Between the patch on the bolt 7 tool 8 and the press ram 3, a sheet is clamped in a deep drawing process.

Die in Figur 1 dargestellte Ziehkissen-Vorrichtung 1 ist etwas größer in Figur 2 dargestellt. Die Ansicht entspricht einem Schnitt entlang der in Figur 3 eingezeichneten Schnittlinie 11. Figur 3 wiederum ist ein Schnitt entlang der in Figur 2 dargestellten Schnittlinie III. Der Bolzen 7 ist im Rahmen 4 der Ziehkissen-Vorrichtung 1 in vertikaler Richtung, die der Wirkrichtung 13 einer vom Bolzen 7 auf den Pressenstößel 3 aufgebrachten Haltekraft entspricht, geführt. Das auf den Bolzen 7 aufgesetzte Werkzeug 8 ist in den Figuren 2 und 3 nicht dargestellt. Zudem sei angemerkt, dass die Figuren 1 bis 3 lediglich schematische Darstellungen der erfindungsgemäßen Ziehkissen-Vorrichtung wiedergeben.In the FIG. 1 illustrated die cushion device 1 is slightly larger in FIG. 2 shown. The view corresponds to a section along the in FIG. 3 drawn section line 11. FIG. 3 turn is a cut along in FIG. 2 illustrated section line III. The bolt 7 is in the frame 4 of the die cushion device 1 in the vertical direction, which corresponds to the effective direction 13 of the bolt 7 applied to the press ram 3 holding force, out. The patch on the bolt 7 tool 8 is in the Figures 2 and 3 not shown. It should also be noted that the FIGS. 1 to 3 only represent schematic representations of the die cushion device according to the invention.

An seinem unteren Ende ist der Bolzen 7 mit dem ersten Keil 9 des Keilschubgetriebes 5 fest verbunden. Der erste Keil 9 ist genauso wie der Bolzen 7 in vertikaler Richtung 13 im Rahmen 4 geführt. Dargestellt sind lediglich seitliche Führungsflächen, jedoch können auch Wälzlager oder Gleitlager zwischen dem Rahmen 4 und dem ersten Keil 9 vorgesehen sein. Die Unterseite des ersten Keils 9, im Folgenden erste Keilfläche, liegt in einer schiefen Ebene, die gegenüber der Horizontalen einen Winkel von etwa 5° aufweist. Über diesen Winkel bestimmt sich das Untersetzungsverhältnis des Keilschubgetriebes 5. Dieser Winkel liegt vorzugsweise in einem Bereich zwischen 3° und 8°. Die erste Keilfläche ist mit dem Bezugszeichen 11 bezeichnet.At its lower end, the bolt 7 with the first wedge 9 of the wedge thruster 5 is firmly connected. The first wedge 9 is the same as the bolt 7 in the vertical direction 13 in the frame 4 out. Shown are only lateral guide surfaces, but also rolling bearings or plain bearings between the frame 4 and the first wedge 9 may be provided. The underside of the first wedge 9, hereinafter referred to as the first wedge surface, lies in an inclined plane which has an angle of approximately 5 ° relative to the horizontal. The reduction ratio of the wedge thruster 5 is determined by this angle. This angle is preferably in a range between 3 ° and 8 °. The first wedge surface is designated by the reference numeral 11.

Zwischen dem ersten Keil 9 und einer Bodenplatte 26 des Rahmens 4 ist ein zweiter Keil 10 angeordnet, der in der horizontalen Verstellrichtung 14 beweglich im Rahmen 4 gelagert ist. Dazu sind zwischen der horizontal ausgerichteten Unterseite des zweiten Keils 10 und der Bodenplatte 26 des Rahmens 4 zwei Wälzführungen 17 angeordnet. Die Oberseite 12 des zweiten Keils 10, im Folgenden zweite Keilfläche, verläuft parallel zur ersten Keilfläche 11 des ersten Keils 9. Zwischen erster Keilfläche 11 und zweiter Keilfläche 12 sind ebenfalls zwei Wälzführungen 18 angeordnet. Wenn der zweite Keil 10 in Verstellrichtung 14 bewegt wird, bewegen sich der erste Keil 9 und der mit dem ersten Keil 9 verbundene Bolzen 7 in der vertikalen Wirkrichtung 13.Between the first wedge 9 and a bottom plate 26 of the frame 4, a second wedge 10 is arranged, which is mounted in the horizontal adjustment 14 movable in the frame 4. For this purpose, two Wälzführungen 17 are arranged between the horizontally oriented bottom of the second wedge 10 and the bottom plate 26 of the frame 4. The upper side 12 of the second wedge 10, hereinafter referred to as the second wedge surface, runs parallel to the first wedge surface 11 of the first wedge 9. Between the first wedge surface 11 and the second wedge surface 12, two rolling guides 18 are likewise arranged. When the second wedge 10 in the adjustment direction 14, the first wedge 9 and the bolt 7 connected to the first wedge 9 move in the vertical direction of action 13.

Als Antrieb des zweiten Keils 10 dienen zwei Linear-Elektromotoren 6, die, wie in Figur 3 dargestellt, zu beiden Seiten des zweiten Keils 10 zwischen dem Rahmen 4 und dem Keil 10 angeordnet sind. Die Statoren 15 der beiden Linear-Elektromotoren 6 sind dabei fest mit dem Rahmen 4 verbunden, die Läufer 16 der beiden Motoren sind an dem Keil 10 angebracht.As a drive of the second wedge 10 serve two linear electric motors 6, which, as in FIG. 3 are arranged on both sides of the second wedge 10 between the frame 4 and the wedge 10. The stators 15 of the two linear electric motors 6 are firmly connected to the frame 4, the rotor 16 of the two motors are mounted on the wedge 10.

In Figur 2 ist gezeigt, dass die erfindungsgemäße Ziehkissen-Vorrichtung 1 ferner eine Steuerung 19 umfasst, mit der die beiden Linear-Elektromotoren 6 angesteuert werden. Die Steuerung 19 erlaubt sowohl eine wegabhängige als auch eine kraftabhängige Steuerung der Ziehkissen-Vorrichtung. Für die wegabhängige Steuerung muss gewährleistet werden, dass der Bolzen 7 synchron mit dem Pressenstößel 3 der Presse 2 bewegt wird. Die Steuerung 19 muss dazu die Position des Bolzens 7 bzw. die Position des ersten Keils 9 erfassen können. Hierzu ist ein Taktlineal 20 am Bolzen 7 angebracht, das über den Sensor 21 abgetastet wird.In FIG. 2 it is shown that the die-cushion device 1 according to the invention further comprises a controller 19, with which the two linear electric motors 6 are driven. The controller 19 allows both a path-dependent and a force-dependent control of the die cushion device. For the path-dependent control must be ensured that the pin 7 is moved synchronously with the press ram 3 of the press 2. The controller 19 must be able to detect the position of the bolt 7 and the position of the first wedge 9. For this purpose, a timing ruler 20 is attached to the bolt 7, which is scanned via the sensor 21.

Alternativ zur wegabhängigen Steuerung erlaubt das System auch eine kraftabhängige Steuerung, wobei dabei die zwischen dem Bolzen 7 und dem Pressenstößel 3 wirkende Kraft gemessen werden muss. Die erfindungsgemäße Ziehkissen-Vorrichtung 1 umfasst hierzu einen Drucksensor 22, der in den Bolzen 7 integriert ist. Die Signale der Sensoren 21 und 22 werden von der Steuerung 19 ausgelesen und ausgewertet.As an alternative to path-dependent control, the system also allows a force-dependent control, in which case the force acting between the bolt 7 and the press ram 3 must be measured. For this purpose, the die-cushion device 1 according to the invention comprises a pressure sensor 22 which is integrated in the bolt 7. The signals of the sensors 21 and 22 are read out by the controller 19 and evaluated.

Claims (10)

  1. Die cushion device (1) for a press (2), for controlling a retention force which is exerted on the press plunger (3) of the press (2) by a pressure face, the die cushion device (1) further comprising, in addition to the pressure face, a frame (4) and a sliding wedge gear (5), and the retention force being adjustable by means of said sliding wedge gear (5), characterised in that the sliding wedge gear (5) is driven by at least one linear electromotor (6), it being possible to control the retention force during a stroke of the press by controlling the linear electromotor (6).
  2. Die cushion device (1) according to claim 1, characterised in that the at least one linear electromotor (6) is the only means for driving the die cushion device (1) for generating the retention force.
  3. Die cushion device (1) according to either claim 1 or claim 2, characterised in that the sliding wedge gear (5) comprises a first wedge (9) having a first wedge face (11) and a second wedge (10) having a second wedge face (12), the pressure face is connected to the first wedge (9), the first wedge (9) is mounted in the frame (4) so as to be displaceable in the direction in which the retention force acts, and the second wedge (10) is mounted in the frame (4) so as to be displaceable in an adjustment direction which is at an angle relative to the direction in which the retention force acts, the first wedge face (11) and the second wedge face (12) facing each other so that a movement of the second wedge (10) in the adjustment direction causes a movement of the first wedge (9) in the direction in which the retention force acts.
  4. Die cushion device (1) according to claim 3, characterised in that the linear electromotor (6) comprises a stator (15) and a rotor (16), the stator (15) being connected to the frame (4) and the rotor (16) being connected to the second wedge (10).
  5. Die cushion device (1) according to either claim 3 or claim 4, characterised in that at least one anti-friction guideway (17, 18) is provided between the second wedge (10) and the frame (4), and between the first wedge face (11) and the second wedge face (12).
  6. Die cushion device (1) according to any of claims 3 to 5, characterised in that at least one anti-friction guideway is provided between the first wedge (9) and the frame (4).
  7. Die cushion device (1) according to any of claims 1 to 6, characterised in that said die cushion device (1) comprises a control unit (19) of the linear electro motor (6).
  8. Die cushion device (1) according to any of claims 1 to 7, characterised in that said die cushion device (1) further comprises a position-measuring system (20, 21) for detecting the position of the pressure face.
  9. Die cushion device (1) according to any of claims 1 to 8, characterised in that said die cushion device (1) further comprises a pressure sensor (22) for detecting the retention force.
  10. Press (2) comprising a press bed (23) and a press ram (3), characterised in that the press (2) comprises a die cushion device (1) according to any of claims 1 to 9, the frame (4) of said die cushion device (1) being integrated in the press bed (23) and connected thereto.
EP11008440.7A 2010-11-19 2011-10-20 Die cushion device Not-in-force EP2457672B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010051958A DE102010051958A1 (en) 2010-11-19 2010-11-19 A die cushion device

Publications (2)

Publication Number Publication Date
EP2457672A1 EP2457672A1 (en) 2012-05-30
EP2457672B1 true EP2457672B1 (en) 2015-07-08

Family

ID=44862326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11008440.7A Not-in-force EP2457672B1 (en) 2010-11-19 2011-10-20 Die cushion device

Country Status (2)

Country Link
EP (1) EP2457672B1 (en)
DE (1) DE102010051958A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103212631A (en) * 2013-04-02 2013-07-24 顺德工业(江苏)有限公司 Deformation correction mechanism in stamping die
DE102015116039A1 (en) * 2015-09-23 2017-03-23 Schuler Pressen Gmbh Pressure pin for a press for forming a workpiece, press for forming a workpiece, method for incorporating and setting a press during forming, method for manufacturing a component and component
CN112872536B (en) * 2021-01-19 2023-01-24 苏州长光华芯光电技术股份有限公司 Auxiliary welding device for laser chip

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2007724A1 (en) 1970-02-19 1971-09-02 Philips Patentverwaltung GmbH 2000 Hamburg Spring loaded floor for bending press tool
DE19821159A1 (en) 1998-05-12 1999-11-25 Johannes Huelshorst Deep draw press
US7000537B2 (en) 2001-04-26 2006-02-21 Sodick Co., Ltd. Press and machine tool
JP2003211231A (en) 2002-01-18 2003-07-29 Sanyo Electric Co Ltd Pressure control mechanism for preventing wrinkle in press forming die
JP4112577B2 (en) * 2005-07-05 2008-07-02 ファナック株式会社 Die cushion mechanism, control device and control method thereof
DE102006034201A1 (en) * 2006-07-24 2008-02-07 Siemens Ag Press
JP4595017B2 (en) * 2009-02-16 2010-12-08 ファナック株式会社 Servo die cushion control device

Also Published As

Publication number Publication date
DE102010051958A1 (en) 2012-05-24
EP2457672A1 (en) 2012-05-30

Similar Documents

Publication Publication Date Title
EP2527058B1 (en) Machine tool in the form of a press for processing workpieces, in particular metal sheets
EP2197660B1 (en) movable slide element for a wedge drive and wedge drive with such movable slide element
AT514644B1 (en) Bending tool system
EP2694230B1 (en) Radial press
EP2017020A2 (en) Method and bending machine for compensating the deflection of components of this bending machine
WO2012083332A1 (en) Bending press having a tool store
EP1197319A1 (en) Wedge drive
DE19637175A1 (en) Method for cropping continuously moving workpieces
EP1758696B1 (en) Hybrid drawing cushion facility
EP3113891B1 (en) Tool slide
EP2457672B1 (en) Die cushion device
DE112015000008B4 (en) tool pusher
EP3010663B1 (en) Rear stop device for a bending machine
AT509090B1 (en) PRESS TO PRODUCE A PRESSURE FOR THE MACHINING OF A WORKPIECE
EP2626165B1 (en) Work piece support
EP3113892B1 (en) Tool slide
EP2885108B1 (en) Lifting apparatus having a toggle lever mechanism
DE102014109144A1 (en) Improved C-frame press
DE10249809B4 (en) Press
DE202008002323U1 (en) Device for splitting large-format plate-shaped workpieces
DE102018108733B4 (en) Drive device for a press or punch and press or punch
DE202012001836U1 (en) Drive device for a processing machine
WO2005032754A1 (en) Welding tongs
DE10162178A1 (en) Lifting device has vertically installed, rotatable lifting spindle with spiral-form slot form in cylindrical upper surface region and with different pitches over its length
DE1502816C3 (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

17P Request for examination filed

Effective date: 20121116

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: GERMAS AG

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RIC1 Information provided on ipc code assigned before grant

Ipc: B21D 24/02 20060101AFI20141222BHEP

INTG Intention to grant announced

Effective date: 20150120

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 734972

Country of ref document: AT

Kind code of ref document: T

Effective date: 20150715

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502011007228

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20150708

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151008

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151009

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151109

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151108

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502011007228

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151020

26N No opposition filed

Effective date: 20160411

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20151020

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151020

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20160630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151020

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20111020

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151031

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20170427

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 734972

Country of ref document: AT

Kind code of ref document: T

Effective date: 20161020

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161020

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171031

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171031

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20180418

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150708

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502011007228

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190501