EP1462660A1 - Hydraulische Antriebsvorrichtung, Verfahren zum Betreiben einer hydraulischen Antriebsvorrichtung und Regel-/Steuergerät hierfür - Google Patents
Hydraulische Antriebsvorrichtung, Verfahren zum Betreiben einer hydraulischen Antriebsvorrichtung und Regel-/Steuergerät hierfür Download PDFInfo
- Publication number
- EP1462660A1 EP1462660A1 EP04006298A EP04006298A EP1462660A1 EP 1462660 A1 EP1462660 A1 EP 1462660A1 EP 04006298 A EP04006298 A EP 04006298A EP 04006298 A EP04006298 A EP 04006298A EP 1462660 A1 EP1462660 A1 EP 1462660A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- working
- pilot
- valve
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
- F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
- F15B9/10—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which the controlling element and the servomotor each controls a separate member, these members influencing different fluid passages or the same passage
Definitions
- the invention relates to a hydraulic drive device for one that can be coupled with a processing tool Working cylinder, one between a bottom dead center (UT) and a top dead center (OT) movable, one Has working piston comprising piston rod, with a Measuring system for determining the position of the working piston, whereby the working piston receives feedback via a Working cylinder actuating working valve actuated, and wherein the feedback a guided in a pilot cylinder, the Pilot valve actuating pilot piston includes.
- UT bottom dead center
- OT top dead center
- Such hydraulic drive devices as they have become known for example from EP 1 138 958 A2, find especially in punching, embossing, nipple or Bending machines use.
- About the usually mechanical carried out feedback between the piston and the Working valve copies the working valve the sequence of movements of the working piston. For this reason, the working valve is in usually also referred to as a copy valve.
- the pilot cylinder known from EP 1 138 958 A2 is used for Setting the OT.
- a reversal of the working valve in the bottom dead center of the working piston is here by the Measuring system that determines the position of the working piston, initiated.
- the position of the pilot piston in the pilot cylinder can be set.
- the TDC position of the working piston can be set.
- the working stroke it is Feedback from the valve actuation of the working valve Cut.
- the present invention is based on the object a hydraulic drive device of the entry to further develop the described type in such a way that high working piston speeds of the OT and UT can be specified precisely and within a very narrow tolerance window moved.
- This task is accomplished by a hydraulic drive device of the type described in the introduction solved according to the invention in that that a position query to determine the pilot piston is provided and that depending on the position of the working piston and the position of the pilot piston actuable pilot valve that can be controlled by the pilot piston is provided.
- the working valve can be actively operated become.
- a trailing of the working piston, as it is from EP 1 138 958 A2 is known, can be prevented.
- the position is preferably queried continuously. However, it can also be discontinuous his.
- the working valve is only operated by the pilot piston. This has the Advantage that further influencing variables that an actuation of the Effect working valve, do not occur.
- the working valve is therefore only through the pilot piston of the feedback actuated.
- the working valve consequently no direct electrical or hydraulic actuation.
- the operation takes place exclusively indirectly via the pilot system.
- the position of the working piston can, in one embodiment the invention directly on the position of the piston rod be determined. It can be on the piston rod
- Signal generator can be arranged with a stationary arranged signal receiver interacts.
- the measuring system is the position of the working piston indirectly via the position of the Working valve and the position of the pilot piston determined. This has the advantage that a measuring system in the area of Working piston can be dispensed with.
- pilot piston with the Working valve in both directions of movement of the pilot piston is rigidly coupled.
- the movement of the pilot piston will consequently directly to the switching of the working valve used.
- pilot piston the working valve only in one direction actuated, and that the actuation of the working valve in the other direction via, for example, corresponding spring means he follows.
- pilot piston for actuating the working valve can be pressurized at least on one side.
- the coupling of the pilot piston with the working valve is the pressurizable side of the pilot piston the one that the Working valve is turned away.
- Another advantageous device results from Provide one with the measuring system and the position query connected control unit, which the pilot valve in Dependence on the position of the working piston and the Controls the position of the pilot piston.
- the control device compares in particular the actual position of the Pilot cylinders with a target position that depends on the Position of the working piston is, and actuated depending the differential size the pilot valve.
- a particularly preferred embodiment of the invention is characterized in that the regulating / control device the Pilot valve controls so that a leading, early Actuation of the working valve to compensate for Response times take place. Should be compensated in particular the reaction times of the working valve, Working piston, pilot valve and pilot piston. The Response times depend in particular on the masses and the Piston stroke speeds. It is advantageous usable that the natural frequency of the system consists of Pilot cylinder, pilot piston and pilot valve is significantly higher, as the natural frequency of the system consisting of Working cylinder, working piston and working valve.
- This Systems represent spring / mass systems.
- the Spring constant is formed by the stiffness of each included hydraulic column in the pilot circuit or Working group, the mass is represented by the mass of the Pilot pistons for the pilot circuit and the mass of the Working piston plus mass of working tool. Since the Natural frequency of the pilot system in practice by a factor of 3 or more than that of the work system can Pilot system very dynamic for predictive setpoint input to be used.
- Position of the pilot piston (actual value) with a setpoint is compared and if the difference signal as a reference variable is used for the movement of the pilot valve.
- the setpoint can in particular depend on the position of the working piston.
- the invention also relates to a regulating / control device for Use in a method according to the invention or in a device according to the invention.
- EP 1 138 958 A2 The subject matter of EP 1 138 958 A2 must be between "fast” Differentiate punching operation and "precise” forming operation.
- UP and DN denote the switching states of the pilot valve (Reference number 6 in FIG. 1 of EP 1 138 958 A2), which again the main valve (reference number 5 in FIG. 1 of EP 1 138 958 A2).
- the device for adjusting the upper Dead center (OT or TDC in EP 1 138 958 A2) is during the Working strokes no longer involved in the control.
- the sequence of the working stroke is shown in Figure 1.
- the working stroke starts in POS1, POS2 should be the bottom dead center.
- in the Switching state DN becomes the signal from the sensor (reference number 20 in Figure 1 of EP 1 138 958 A2) monitored.
- the working piston now hits again according to Figure 4 to a resistor, e.g. in POS2d.
- the working piston slows down, see Sr, while the pilot piston slows down linearly moved, see Sp.
- the pilot piston is now but already moved beyond POS2 to POS2c. This can not be recognized by the control device, because for the Pilot piston according to EP 1 138 958 A2 no position sensor for querying whose position is provided.
- the sensor will reach POS2 by report the working piston and immediately by the Trigger control unit UP.
- the reversal process of the pilot piston lasts from T2 to T2C according to FIG. 4.
- the working piston inevitably moves over the POS2 dimension out to the actual changeover point POS2e.
- the Perr error measure according to Figure 4 is disadvantageous and must in the Arrangement according to EP 1 138 958 A2 are accepted.
- FIG. 5 is a hydraulic according to the invention Drive device 10 shown for a working cylinder 12, the one between a bottom dead center UT and an upper one Dead center OT movable piston 14 has.
- the Working piston 14 includes a piston rod 16.
- the piston 14 or the piston rod 16 actuated via a Feedback 18 a controlling the working cylinder 12 Working valve 20.
- the feedback 18 includes a the piston rod 16 coupled yoke 22 and one on the yoke 22 arranged pilot cylinder 24, in which a pilot piston 26th is slidably mounted.
- the working valve 20 is actuated via a piston rod 28 of the pilot piston 26.
- the working valve 20 is a spring-biased 3/3-way valve.
- the pilot piston 26 acts thereby over the piston rod 28 against a spring means 30.
- Das Working valve 20 provides a total of three connections, one Pressure port P, a tank port T and one Consumer connection A to the upper pressure chamber 32 of the Working cylinder 14.
- the opposite of the pressure chamber 32, pressure chamber 34 separated by the piston 14 is via a Port B and via a line 36 to the pressure port P connected.
- the pressure chamber 32 is shown in the figure Middle position n of the working valve 20 closed; the Pressure chamber 34 is connected to the pressure line P.
- the pressure chamber 32 In the Operating position a of the valve 20, the pressure chamber 32 with connected to the pressure port P. Since the pressure chamber 32 facing piston area is larger than that of the pressure chamber 34 facing, then a downward force becomes Provided and the working piston is down emotional.
- the pressure chamber 32 In the actuation position b, the pressure chamber 32 is included connected to the tank line T. Because of the pressure in the pressure chamber 34 pressure present, the piston 14 is moved upward.
- the device 10 also has a measuring system 38, with which the position of the working piston 14 or Piston rod 16 can be determined.
- the measuring system can for example one arranged on the piston rod 16 Signal generator and preferably several stationary Have signal receivers. Are particularly advantageous in the Practice potentiometric sensors, sensors based on Magnetostriction (transit time measurement) and incremental magnetic or optical sensors.
- the measuring system 38 is included a control device 40, in which the Measuring system 38 recorded values can be evaluated.
- the device 10 also includes a position of the Pilot piston 26 or its piston rod 28 continuously recording position query 42.
- the measuring system 38 can also query the position Signaling device on the pilot piston and stationary Have signal receivers.
- the Position query 42 connected to the control device 40.
- the position query 42 can be electrical or Hydromechanical system can be executed or by a sensor of the same design as for the working piston be carried out, or advantageously by a mechanical Return.
- the pilot piston 24 is controlled via a pilot valve 44, which is operated by the control device 40.
- a pilot valve 44 which is operated by the control device 40.
- the position of the working piston 14 about the position of the working valve 20 in connection with the Position of the pilot piston 28 can be determined.
- the working piston 14 By determining the position of the working piston 14 to one and the position of the pilot piston 26 to the other advantageously the working piston 14 with an elevated Dynamics with improved process reliability can be controlled.
- the position of the pilot piston 28 determined and the pilot valve driving the pilot piston 44 in Dependence on the position of the working piston 16 and Pilot piston 28 actuated.
- the position query 42 delivers for this purpose an actual value signal 46 which is linked to a setpoint signal 48 is compared, the difference signal 50 as Command variable for the movement of the pilot valve 44 is used.
- the setpoint signal 48 is here in particular depending on the actual position of the working piston 16.
- the desired signal 48 consequently results from the actual signal 52 of the measuring system 38.
- the reference variable for the actuation of the Working valve 20 and thus for the movement of the Working piston 14 is consequently controlled by an internal control loop formed the pilot valve 44, the position of the Pilot piston 28, the position query 42 and the comparison of the Actual value 46 with the setpoint 48 in the control device 40 includes.
- a comparator is provided for evaluating the difference signal be designed as a rotary slide valve.
- Such one Rotary slide valve is for example in DE 198 36 042 A1 described.
- the device 10 has in particular the Advantage that with it a targeted pre-control of the Reversing process of the working piston 14 are performed can.
- the working piston 14 is moved in the direction of the UT.
- the measuring system 38 can be used to determine when the Working piston 14 a position near the turning point UT reached. From a UT-dS position, i.e. shortly before reaching it of the reversal point UT, the control device 40 actuates the Pilot valve 44, whereby the pilot piston 26 reverses the process initiates by operating the working valve 20.
- dS depends in particular on the masses, Stroke speeds and reaction times of the individual pistons and valves.
- FIG. 6 the sequence is without hitting one Workpiece shown.
- the pilot piston is in the working state DN moved to position POS2. This can be done quickly and precisely take place because the measuring system in the form of position query 42 with the comparator and the actuator in the form of Pilot valve 44 form an outer control loop. Through the mechanical run-on control follows the working piston Pilot pistons up to POS2. This POS2 is "run over" not possible because the working valve 20 by the mechanical Return of the chain of effects: 16, 22, 24, 26, 28 the piston of the main valve closes again.
- FIG. 7 shows the accident in which the Movement of the main piston in POS2d due to mechanical resistance through the workpiece.
- the main piston slows down according to the path curve Sr.
- external Position control loop with position query 42 can Pilot pistons can still be safely placed on POS2.
- the working piston is strong when POS2e is reached accelerates because the workpiece has now deformed or was punched through and no longer provides resistance, can of the working piston do not go beyond POS2, because this as End position of the movement by the pilot piston already is mechanically predetermined.
- Measuring system 38 recognized the reaching of POS2 and the Reversal takes place by changing to the UP state.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Presses (AREA)
- Servomotors (AREA)
- Valve Device For Special Equipments (AREA)
- Fluid-Driven Valves (AREA)
Abstract
Description
- Figur 1 bis 4:
- verschiedene Weg-Zeit-Diagramme der Ventilstellungen und der Hubpositionen den Stand der Technik gemäß der EP 1 138 958 A2 betreffend,
- Figur 5:
- eine erfindungsgemäße hydraulische Antriebsvorrichtung, und
- Figuren 6 und 7:
- verschiedene Weg-Zeit-Diagramme der Ventilstellungen und der Hubpositionen gemäß der Erfindung.
Claims (14)
- Hydraulische Antriebsvorrichtung (10) für einen mit einem Bearbeitungswerkzeug koppelbaren Arbeitszylinder (12), der einen zwischen einem unteren Todpunkt (UT) und einem oberen Todpunkt (OT) bewegbaren, eine Kolbenstange (16) umfassenden Arbeitskolben (14) aufweist, mit einem Messsystem (38) zur Bestimmung der Position des Arbeitskolbens (14), wobei der Arbeitskolben (14, 16) über eine Rückmeldung (18) ein den Arbeitszylinder (12) ansteuerbares Arbeitsventil (20) betätigt, und wobei die Rückmeldung (18) ein in einem Pilotzylinder (24) geführten, das Arbeitsventil (20) betätigenden Pilotkolben (26, 28) umfasst, dadurch gekennzeichnet, dass eine Positionsabfrage (42) zur Bestimmung der Position des Pilotkolbens (26, 28) vorgesehen ist und dass ein in Abhängigkeit von der Position des Arbeitskolbens (14, 16) und der Position des Pilotkolbens (26, 28) betätigbares, den Pilotkolben (26, 28) ansteuerbares Pilotventil (44) vorgesehen ist.
- Vorrichtung (10) nach Anspruch 1, dadurch gekennzeichnet, dass das Arbeitsventil (20) ausschließlich vom Pilotkolben (26, 28) betätigt wird.
- Vorrichtung (10) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Messsystem (38) die Position des Arbeitskolbens (14, 16) unmittelbar über die Position der Kolbenstange (16) bestimmt.
- Vorrichtung (10) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Messsystem (38) die Position des Arbeitskolbens (14) mittelbar über die Position des Arbeitsventils (20) und die Position des Pilotkolbens (26) bestimmt.
- Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Pilotzylinder (24) mit dem Arbeitskolben (14, 16) in beide Bewegungsrichtungen des Arbeitskolben starr gekoppelt ist.
- Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dadurch gekennzeichnet, dass der Pilotkolben (26, 28) mit dem Arbeitsventil (20) in beide Bewegungsrichtungen des Pilotkolben (26) starr gekoppelt ist.
- Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Pilotkolben (26, 28) zur Bestätigung des Arbeitsventils (20) wenigstens einseitig druckbeaufschlagbar ist.
- Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein mit dem Messsystem (38) und der Positionsabfrage (42) verbundenes Regel/Steuergerät (40) vorgesehen ist, welches das Pilotventil (44) in Abhängigkeit von der Position des Arbeitskolbens (14, 16) und der Position des Pilotkobens (26, 28) ansteuert.
- Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Regel-/Steuergerät (40) das Pilotventil (24) so ansteuert, dass ein vorauseilendes, frühes Betätigen des Arbeitsventils (20) zur Kompensation von Reaktionszeiten erfolgt.
- Verfahren zum Betreiben einer hydraulischen Antriebsvorrichtung (10), nach insbesondere einem der vorhergehenden Ansprüche, für einen mit einem Bearbeitungswerkzeug koppelbaren Arbeitszylinder (12), der einen zwischen einem unteren Todpunkt (UT) und einem oberen Todpunkt (OT) bewegbaren, eine Kolbenstange (16) umfassenden Arbeitskolben (14) aufweist, wobei die Position des Arbeitskolbens (14, 16) bestimmt wird und der Arbeitskolben (14, 16) über eine Rückkopplung (18) ein den Arbeitszylinder (12) ansteuerndes Arbeitsventil (20) betätigt, und wobei die Rückkopplung (18) einen in einem Pilotzylinder (24) geführten Pilotkolben (26, 289 umfasst, dadurch gekennzeichnet, dass die Position des Pilotkolbens (26, 28) bestimmt wird und dass ein den Pilotkolben (26, 28) ansteuerndes Pilotventil (44) in Abhängigkeit von der Position des Arbeitskolbens (14, 16) und des Pilotkolbens (26, 28) betätigt wird.
- Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass ein vorauseilendes, frühes Betätigen des Arbeitsventils (20) zur Kompensation von Reaktionszeiten erfolgt.
- Verfahren nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass die Position des Pilotkolbens (26, 28) (Istwert 46) mit einem Sollwert (48) verglichen wird und dass das Differenzsignal als Führungsgröße (50) für die Betätigung des Pilotventils (44) herangezogen wird.
- Verfahren nach Anspruch 12, dadurch gekennzeichnet, dass der Sollwert (48) abhängig von der Position (52) des Arbeitskolbens (14, 16) ist.
- Regel-/Steuergerät (40) zur Anwendung in einem Verfahren nach einem der Ansprüche 10 bis 13 und/oder zur Verwendung in einer Vorrichtung (10) nach einem der Ansprüche 8 oder 9.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10314302 | 2003-03-25 | ||
DE10314302A DE10314302B3 (de) | 2003-03-25 | 2003-03-25 | Hydraulische Antriebsvorrichtung, Verfahren zum Betreiben einer hydraulischen Antriebsvorrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1462660A1 true EP1462660A1 (de) | 2004-09-29 |
EP1462660B1 EP1462660B1 (de) | 2005-07-20 |
Family
ID=32798162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04006298A Expired - Lifetime EP1462660B1 (de) | 2003-03-25 | 2004-03-17 | Hydraulische Antriebsvorrichtung, Verfahren zum Betreiben einer hydraulischen Antriebsvorrichtung und Regel-/Steuergerät hierfür |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1462660B1 (de) |
AT (1) | ATE299996T1 (de) |
DE (2) | DE10314302B3 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005009583A1 (de) * | 2005-02-28 | 2006-08-31 | Hycos Srl | Hydraulikventil |
DE102010038448B3 (de) * | 2010-07-27 | 2011-11-03 | Voith Patent Gmbh | Verfahren zum Betreiben einer hydraulischen Antriebsvorrichtung und hydraulische Antriebsvorrichtung |
CN113515148A (zh) * | 2020-03-31 | 2021-10-19 | 纳博特斯克有限公司 | 流量控制装置、流量控制方法及计算机可读取的存储介质 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016121887A1 (de) * | 2016-11-15 | 2018-05-17 | Amazonen-Werke H. Dreyer Gmbh & Co. Kg | Hydraulischen Stellungsanzeiger zur analogen Anzeige der Position fluidischer Arbeitszylinder |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0755323A1 (de) * | 1994-04-09 | 1997-01-29 | Gräbener Pressensysteme GmbH & Co. KG | Presse für eine kaltverformung von metallwerkstücken |
EP1138958A2 (de) * | 2000-03-30 | 2001-10-04 | Euromac S.r.l. | Druckmittel-betriebener Schaltkreis zur Einstellung des oberen und unteren Totpunkts des Stanzzylinders einer Stanzmaschine |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2926864C2 (de) * | 1979-07-03 | 1984-08-09 | Zimmermann & Jansen GmbH, 5160 Düren | Vorrichtung zur exakten Stellungsrückmeldung eines Arbeitskolbens in einem Hydraulik-Arbeitszylinder |
-
2003
- 2003-03-25 DE DE10314302A patent/DE10314302B3/de not_active Expired - Fee Related
-
2004
- 2004-03-17 EP EP04006298A patent/EP1462660B1/de not_active Expired - Lifetime
- 2004-03-17 AT AT04006298T patent/ATE299996T1/de not_active IP Right Cessation
- 2004-03-17 DE DE502004000026T patent/DE502004000026D1/de not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0755323A1 (de) * | 1994-04-09 | 1997-01-29 | Gräbener Pressensysteme GmbH & Co. KG | Presse für eine kaltverformung von metallwerkstücken |
EP1138958A2 (de) * | 2000-03-30 | 2001-10-04 | Euromac S.r.l. | Druckmittel-betriebener Schaltkreis zur Einstellung des oberen und unteren Totpunkts des Stanzzylinders einer Stanzmaschine |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005009583A1 (de) * | 2005-02-28 | 2006-08-31 | Hycos Srl | Hydraulikventil |
DE102010038448B3 (de) * | 2010-07-27 | 2011-11-03 | Voith Patent Gmbh | Verfahren zum Betreiben einer hydraulischen Antriebsvorrichtung und hydraulische Antriebsvorrichtung |
WO2012013373A1 (de) | 2010-07-27 | 2012-02-02 | Voith Patent Gmbh | Verfahren zum betreiben einer hydraulischen antriebsvorrichtung und hydraulische antriebsvorrichtung |
CN113515148A (zh) * | 2020-03-31 | 2021-10-19 | 纳博特斯克有限公司 | 流量控制装置、流量控制方法及计算机可读取的存储介质 |
Also Published As
Publication number | Publication date |
---|---|
EP1462660B1 (de) | 2005-07-20 |
DE502004000026D1 (de) | 2005-08-25 |
DE10314302B3 (de) | 2004-09-30 |
ATE299996T1 (de) | 2005-08-15 |
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