EP3115190A1 - Device and method for controlling the principal drive of a precision cutting press - Google Patents
Device and method for controlling the principal drive of a precision cutting press Download PDFInfo
- Publication number
- EP3115190A1 EP3115190A1 EP15002015.4A EP15002015A EP3115190A1 EP 3115190 A1 EP3115190 A1 EP 3115190A1 EP 15002015 A EP15002015 A EP 15002015A EP 3115190 A1 EP3115190 A1 EP 3115190A1
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- EP
- European Patent Office
- Prior art keywords
- pressure
- pressure chamber
- hydraulic
- fluid
- valve
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- 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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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005520 cutting process Methods 0.000 title claims description 8
- 239000012530 fluid Substances 0.000 claims abstract description 85
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 3
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 210000003108 foot joint Anatomy 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Images
Classifications
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- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/161—Control arrangements for fluid-driven presses controlling the ram speed and ram pressure, e.g. fast approach speed at low pressure, low pressing speed at high pressure
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- 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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/163—Control arrangements for fluid-driven presses for accumulator-driven presses
Definitions
- the invention relates to a device for controlling the main drive of a hydraulically driven fineblanking press, with a arranged in the foot master cylinder, in which the pressure chambers with hydraulic fluid acted upon, a lifting movement between UT and OT in the direction Hubachse exporting and a table top carrying main piston / plunger is performed, with guided in Schnellhubzylinders, pressurized with hydraulic fluid pressure chambers double-acting Schnellhubkolben with piston rods for rapid traverse / Tasthub of the main piston and table top and with at least one hydraulic pump unit comprehensive hydraulic system for supplying the pressure chambers with the set to a predetermined working pressure by a central control hydraulic fluid.
- the invention further relates to a method for controlling the main drive of a hydraulically driven fineblanking press guided in a master cylinder of the foot, carrying a table top main piston, which performs a lifting movement between UT and OT, in which the main piston arranged with table top by pressurizing the pressure chambers of a Schnellhubzylinder Schnellhubkolbens in rapid traverse / Tasthub between UT and OT or OT and UT is moved, then the rapid traverse / Tasthub terminated and then the main piston in the power stroke performs the cutting or forming operation, the pressure chambers of the main piston with a predetermined by a central control and by a Hydraulic pump unit generated working pressure of a hydraulic fluid from a hydraulic system can be acted upon.
- the fineblanking process requires special triple-action presses that basically operate from the bottom up, allowing controlled control of the cutting process with the auxiliary functions for the ring point, anvil and ejector.
- the ring-tooth force and counter-holding force are generated hydraulically and the cutting force is generated mechanically or hydraulically.
- piston assemblies that are used in presses for driving or pressurizing.
- DE 2 218 476 A1 and DE 2 264 429 A1 it is a fine stamping press with two rigidly interconnected frame bodies, to which two to Clamping two tool parts serving, hydraulically axially towards each other and away from each other displaceable table body are mounted.
- a cylinder space is provided, in which two coaxial, with respect to each other movable piston are arranged, of which the first is connected to a piston rod and the second surrounds this piston rod and forms a part of the first frame body displaceably removed, first table body.
- the second piston has an internal thread and is screwed onto an externally threaded bush, so that the axial position of the second piston is adjustable.
- From the DE 195 24 042 is a method for controlling the drive, in particular a hydraulic press for forming and / or cutting of sheets with at least one double-acting piston-cylinder unit for driving a press ram known.
- This press works in the direction of gravity, ie from top to bottom.
- the upper and lower cylinder space of the piston-cylinder unit is connected via a valve device.
- a motor / pump device with a volume-controllable hydraulic motor / pump device is provided, which is driven at least via a rechargeable storage system and whose controllable torque can be fed to a controllable pump device.
- the DE 10 2012 006 981 A1 discloses a hydraulic press with a plunger, which is adjustable by means of a hydraulic drive device, wherein the hydraulic drive device comprises a working cylinder in which a drive piston is slidably received, which divides the interior of the drive cylinder into a first working chamber and a second working chamber, which with a Hydraulic fluid can be acted upon. At least one hydraulic return device is provided to bring the plunger after the forming operation in its initial position.
- the basic idea of this known prior art is to derive the hydraulic fluid during the forming process from the second working chamber via a pump in the storage tank.
- EP 891 235 B1 the main piston and the rapid-action piston belong to separate hydraulic circuits, in which the displaced from the work spaces Hydraulic fluid as the pistons move down either into a tank ( DE 10 2009 058 407A1 ) or from the upper working space to the lower working space ( DE 10 2004 006 126 B4 . DE 196 42 635 A1 . DE 102 15 003 A1 . EP 0 891 235 B1 ) are rearranged. This shift takes place in separately installed hydraulic lines and independent of the position of the quick-lift pistons in the quick-lift cylinder.
- the Schnellhubzylinder are basically arranged on the head of the press and therefore must be able to carry the entire upper structure of the press including Traverse and to lift the Zustellhub.
- the main drive / plunger of these known presses is equipped with no rapid traverse or Schnellhubzylinder, so that the cycle time or the achievable number of strokes is correspondingly low.
- the present invention seeks to provide an apparatus and a method for controlling the main drive of a hydraulically driven fineblanking press, simplifies the hydraulic circuit by eliminating hydraulic lines and reduces the hydraulic fluid amount while increasing the number of strokes with simple construction of the press can be.
- the solution according to the invention is based on the knowledge of displacing the hydraulic fluid in the pressure chambers of the main piston during the rapid traverse / key stroke during delivery in the stroke direction of the quick-lift pistons from one pressure chamber into the other pressure chamber of the main piston.
- the main piston discusintranartig projecting work surfaces the superimposed in the master cylinder space the first (upper) and second (lower) pressure chamber with low lift, which communicating with the hydraulic system in connection first (upper) fluid channels and second (lower) Fluid channels are assigned in the foot piece, wherein the first fluid channels are connected to the second fluid channels by a respective arranged in the foot bypass channel, which forms an internal hydraulic system with these channels and the pressure chambers, in rapid traverse by pressure-controlled proportional valves when displacing the hydraulic fluid from the first is opened in the second pressure chamber and closed in the power stroke, and that during the power stroke, at least one second fluid channel is a Krafthubkanal and the first pressure chamber is connected to a discharge channel, said fluid channel for supplying hydraulic fluid predetermined Dru cks in the second pressure chamber with a supply channel and branch channel and the discharge channel for discharging the displaced from the first pressure chamber hydraulic fluid via a tank valve with a collecting tank in connection.
- the second pressure chamber of the main piston is connected to the hydraulic pump unit during power stroke via a safety valve, at least one pressure sensor for pressure detection, at least one pressure relief valve to limit the pressure of the flow and a proportional valve for adjusting the flow rate.
- the main piston may have the same or different sized work surfaces, whereby both constant velocity piston and other pistons can be used depending on the application.
- proportional valves and the tank valve are pressure-controlled cartridge valves.
- a further preferred embodiment of the device according to the invention provides that the quick-lift piston divides pressure chambers with different sized effective surfaces in the quick-lift cylinder, which are connected via channels arranged in the footpiece to the hydraulic system, wherein the pressure chamber with the larger effective area in a hydraulic train of non-returnable check valve, 3-way proportional valve, controllable proportional valve and high-pressure accumulator integrated and the pressure chamber with the smaller effective area via the 4/3-way proportional valve is connected to the collecting tank.
- the different large effective surfaces on the quick-lift piston make it possible to execute the rapid traverse in the upward and downward direction at different speeds. Conveniently, the larger effective surface of the quick-lift piston is associated with the upward movement.
- the main piston is associated with a path-measuring unit for detecting the TDC position of the main piston and the first pressure chamber of the main piston, the tank valve to build up a counterforce to reduce the cutting stroke.
- the hydraulic pump unit comprises at least one proportional valve for adjusting the delivery rate, at least one pressure sensor for the control of the proportional valve and at least one pressure relief valve for limiting the pressure and attitude of the flow.
- the object of the invention is further achieved by a method in that the pressure chambers of Schnellhubkolbens are fed at rapid traverse / Tasthub of a permanently pressurized high pressure accumulator and at the same time the pressure chambers of the main piston separated from the hydraulic system and connected via fluid channels and bypass channels, so that hydraulic fluid is displaced from the first pressure chamber in the second pressure chamber in the stroke direction of the quick-lift piston during the rapid traverse almost without pressure.
- the TDC position of the main piston is adjusted via a distance measuring system with the central control, wherein the delivery volume of the hydraulic pump unit is regulated back before reaching TDC or with the tank valve in the first pressure chamber, a back pressure is generated.
- the Fig. 1 shows a perspective view of a hydraulically driven fineblanking press 1, the main piston 2 basically performs a lifting movement between a bottom dead center UT and a top dead center OT in the direction of lifting axis HU from bottom to top.
- the press frame 3 of the press 1 comprises a head piece 4, a foot piece 5, box-shaped hollow columns 6 and tie rods 7.
- a table top 8 is arranged on the upper side OS of the foot piece 5, which carries the tool lower part, not further shown.
- two opposing parallel to the stroke axis HU aligned Schnellhubzylinder 9 are introduced, each receive a double-acting Schnellhubkolben 10 and are closed with a lid 11.
- the quick-lift piston 10 has a guided through the lid 11 piston rod 12 which is connected to a carrier 13 which is fixed to a side wall 14 of the table top 8.
- the fast-stroke piston 10 divides in the quick-lift cylinder 9 a first and second pressure chamber 15a and 15b (see also Fig. 3 ).
- the pressure chamber 15a and the pressure chamber 15b is connected via a respective channel 16a or 16b introduced in the foot piece 5 with the hydraulic line 17 of the hydraulic system 18 for application of hydraulic fluid, so that it is possible to move the table top 8 in rapid traverse in the direction of the head piece 4 to move vertically.
- Fig. 4a . 4b and 5 show the spatial position of the fluid channels 24a to 24h and the discharge channel 29 in the foot 5 in a transparent representation and in section along the line BB of Fig. 2 ,
- a master cylinder space 19 is formed, whose axis HA lies on the lifting axis HU of the fineblanking press and accommodates the double-acting main piston 20.
- the main piston 20 has a cylindrical shaft 21, which discus-like perpendicular to the axis HA projecting work surfaces 22a and 22b, which divides the master cylinder chamber 19 into a first (upper) pressure chamber 23a and a second (lower) pressure chamber 23b with low lift height, so that the Foot piece 5 is compact and has a low height.
- the master cylinder chamber 19 and thus the pressure chamber 23 a is pressure-tightly closed by a cover 27, which is fastened to the foot piece 5.
- the first (upper) fluid channels 24a, 24b, 24c and 24d and the second (lower) fluid channels 24e, 24f are guided in the pressure chambers 23a and 23b of the main piston 20 perpendicular to the lifting axis HU according to the height position of the pressure chambers 23a and 23b , 24g and 24h.
- the fluid channels 24a to 24d are connected to the fluid channels 24e to 24h by a respective bypass channel 26.
- a pressure-controlled proportional valve 25a, 25b, 25c, and 25d is employed as a cartridge valve which closes the respective bypass passage 26 when the second pressure chamber 23b is pressurized with hydraulic fluid from the hydraulic system 18 is charged.
- the main piston 20 performs a corresponding stroke movement between bottom dead center UT and top dead center OT and displaces the hydraulic fluid in the first (upper) pressure chamber 23a via the first (upper) fluid channels 24a to 24d, the bypass channels 26 and the second (lower) fluid channels 24e to 24h into the second (lower) when the proportional valve 25a to 25d is open.
- Pressure chamber 23b is employed as a cartridge valve which closes the respective bypass passage 26 when the second pressure chamber 23b is pressurized with hydraulic fluid from the hydraulic system 18 is charged.
- the first (upper) pressure chamber 23a, the first (upper) fluid channels 24a to 24d, the bypass channels 26, the lower fluid channels 24e to 24h and the second (lower) pressure chamber 24b thus form a closed hydraulic system which, depending on the position of the proportional valves 25a can be opened or closed until 25d, so that the first (upper) pressure chamber 23a and second (lower) pressure chamber 23b are almost depressurized and the hydraulic fluid in the second (lower) pressure chamber 23b of the main piston 20 is displaced and a fluid column in the direction of BR Schnellhubkolben 10 can be constructed during rapid traverse. If the fast-stroke piston reaches its setpoint position in rapid traverse, the proportional valves 25a to 25d switch to the closed position and the power stroke begins, which subsequently starts with the Fig. 6 is explained in more detail.
- the Fig. 6 shows the foot 5 in a further section along the line CC Fig. 2 , the position of the fluid channel 24e and the discharge channel 29 (see FIG Fig. 4a ) illustrates.
- the discharge channel 29 opens and in the second pressure chamber 23b of the fluid channel 24e, which are arranged perpendicular to the lifting axis HU according to the altitude of the pressure chambers 23a and 23b superimposed.
- a tank valve 30 for opening and closing the discharge channel 29 as a cartridge valve used, which is in the open position, when in the power stroke, the hydraulic fluid in the pressure chamber 23a is displaced to the collecting tank 44.
- the fluid channel 24e is connected to a feed channel 32 lying parallel to the stroke axis HU in the foot piece 5 and to a branch channel 33 leaving the latter, via which the hydraulic system 18, which is not shown further, is connected.
- Fig. 7a and Fig. 7b is the displacement of the hydraulic fluid from the first (upper) pressure chamber 23a in the second (lower) pressure chamber 23b during lifting movement of the main piston 20 in the direction OT during rapid traverse shown schematically using the example of the fluid channels 24a and 24b.
- the main piston 20 with table top 8 performs by the Schnellhubkolben 10 a stroke in the direction of TDC.
- the hydraulic fluid contained in the first (upper) pressure chamber 23a is displaced from the first (upper) pressure chamber 23a by the upward movement of the working surface 22a of the main piston 20 with the tank valve 30 closed and passes through the first fluid channel 24a, the bypass channel 26, with the proportional valve 25a open second fluid channel 24e in the lower pressure chamber 23b.
- the displacement is indicated by an arrow in the Fig. 7b characterized.
- Fig. 7b has the Schnellhubkolben 10 reaches its upper target position, the proportional valve 25a closes, the proportional valve 30 opens and the power stroke begins.
- Fig. 8 shows the hydraulic train 41 for the rapid traverse and the hydraulic train 42 for the power stroke of the main piston 20.
- the hydraulic train 41 includes a high pressure accumulator 34 for hydraulic fluid, a controlled by the central control 35 logical proportional valve 36 which is connected to the hydraulic system 18 via the hydraulic line 17 and the pressure level in the high pressure accumulator 34 adjusts a pressure transducer 38, a safety valve 39, a 4th / 3-way proportional valve 37 which the hydraulic fluid according to the position of the Schnellhubkolbens 10 in Schnellhubzylinder 9 on the pressure chambers 15a or 15b on or off, a lower pressure chamber 15b associated pilot-operated check valve 43 and the pressure chambers 15a and 15b of the quick-lift piston 10th
- the pressure chambers 15a and 15b of the quick-lift piston 10 are supplied via the common high-pressure accumulator 34 with hydraulic fluid corresponding pressure, which is set by a corresponding control of the valve 36 from the central controller 35 as a storage charge.
- the proportional valve 25a installed in the fluid channel 24e closes, the tank valve 30 opens and the 4/3-way proportional valve 37 switches to a middle position.
- the fluid channel 24e then assumes the function of a Krafthubkanals, is supplied in the hydraulic fluid predetermined pressure in the second pressure chamber 23b.
- the Hydrauklikstrang 42 for the power stroke comprises a hydraulic pump unit 40, the at least one proportional valve 45 for adjusting the flow rate, at least one pressure relief valve 46 for limiting the pressure of the flow and at least one pressure sensor 47 for pressure detection for power limitation and passing the Pressure value is assigned to the central control 35 for controlling the pressure relief valve 46, a safety valve 48, which connects the hydraulic fluid guided in the lower pressure chamber 23 b or a pressure transducer 49 for determining the pressure value for controlling the pressure relief valve 46 to the central control is passed, and the pressure chambers 23 a and 23 b of the main piston 20th If the main piston 20 has reached its top dead center OT, the power stroke is completed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Presses (AREA)
- Press Drives And Press Lines (AREA)
- Punching Or Piercing (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum Steuern des Hauptantriebes einer hydraulisch angetriebenen Feinschneidpresse. Die Aufgabe der Erfindung besteht darin, eine Vorrichtung und ein Verfahren zum Steuern des Hauptantriebes einer hydraulisch angetriebenen Feinschneidpresse zu schaffen, deren hydraulische Schaltung durch Wegfall von Hydraulikleitungen vereinfacht, die Hydraulikfluidmenge unter gleichzeitiger Erhöhung der Hubzahl bei einfacher Konstruktion der Presse reduziert werden kann. Gelöst wird diese Aufgabe dadurch, dass der Hauptkolben (20) diskusscheibenartig vorstehende Arbeitsflächen (22a,22b) aufweist, die im Hauptzylinderraum (19) übereinanderliegend den ersten (oberen) und zweiten (unteren) Druckraum (23a,23b) mit geringem Hub abteilen, denen mit dem Hydrauliksystem (18) in Verbindung stehende erste (obere) Fluidkanäle (24a,24b, 24c, 24d) und zweite (untere) Fluidkanäle (24e,24f, 24g, 24h) im Fußstück (5) zugeordnet sind, wobei die Fluidkanäle (24a bis 24d) mit den Fluidkanälen (24e bis 24f) durch je einen im Fußstück (5) angeordneten Umgehungskanal (26) verbunden sind, der mit diesen Kanälen (24a bis 24h) und den Druckräumen (23a,23b) ein inneres hydraulisches System bildet, das im Eilgang durch druckgesteuerte Proportionalventile (25a, 25b, 25c, 25d) beim Verdrängen des Hydraulikfluides aus dem ersten in den zweiten Druckraum (23a,23b) geöffnet und im Krafthub geschlossen ist, und dass während des Krafthubes mindestens ein zweiter Fluidkanal ein Krafthubkanal ist und der erste Druckraum (23a) mit einem Entlastungskanal (29) verbunden ist, wobei dieser Fluidkanal zum Zuführen von Hydraulikfluid vorgegebenen Drucks in den zweiten Druckraum (23b) mit einem Zuleitungskanal (32) und Abzweigkanal (33) und der Entlastungskanal (29) zum Abführen des aus dem ersten Druckraum (23a) verdrängten Hydraulikfluides über ein Tankventil (30) mit einem Auffangtank (44) in Verbindung stehen.The invention relates to an apparatus and a method for controlling the main drive of a hydraulically driven fineblanking press. The object of the invention is to provide an apparatus and a method for controlling the main drive of a hydraulically driven fineblanking press whose hydraulic circuit simplified by eliminating hydraulic lines, the amount of hydraulic fluid can be reduced while increasing the number of strokes with simple construction of the press. This object is achieved in that the main piston (20) discus-like projecting work surfaces (22a, 22b) which in the master cylinder space (19) superimposed on the first (upper) and second (lower) pressure chamber (23a, 23b) with a small stroke, associated with the hydraulic system (18) in communication first (upper) fluid channels (24a, 24b, 24c, 24d) and second (lower) fluid channels (24e, 24f, 24g, 24h) in the foot piece (5), wherein the fluid channels (24a to 24d) with the fluid channels (24e to 24f) by a respective foot piece (5) arranged bypass channel (26) are connected to these channels (24a to 24h) and the pressure chambers (23a, 23b) an internal hydraulic system forms, in rapid traverse by pressure-controlled proportional valves (25a, 25b, 25c, 25d) when displacing the hydraulic fluid from the first to the second pressure chamber (23a, 23b) is opened and closed in the power stroke, and that during the power stroke at least a second Fluidka Nal is a Kraftstubkanal and the first pressure chamber (23a) with a discharge channel (29) is connected, said fluid channel for supplying hydraulic fluid predetermined pressure in the second pressure chamber (23b) with a supply channel (32) and branch channel (33) and the discharge channel (29) for discharging the displaced from the first pressure chamber (23 a) hydraulic fluid via a tank valve (30) with a collecting tank (44) are in communication.
Description
Die Erfindung betrifft eine Vorrichtung zum Steuern des Hauptantriebes einer hydraulisch angetriebenen Feinschneidpresse, mit einem im Fußstück angeordneten Hauptzylinder, in welchem der über Druckräume mit Hydraulikfluid beaufschlagbare, eine Hubbewegung zwischen UT und OT in Richtung Hubachse ausführende und eine Tischplatte tragende Hauptkolben/Stößel geführt ist, mit in Schnellhubzylindern geführten, über Druckräume mit Hydraulikfluid beaufschlagbare doppelt wirkende Schnellhubkolben mit Kolbenstangen für den Eilgang/Tasthub von Hauptkolben und Tischplatte und mit einem mindestens eine Hydraulikpumpeneinheit umfassenden Hydrauliksystem zum Versorgen der Druckräume mit dem auf einen vorgegebenen Arbeitsdruck durch eine zentrale Steuerung eingestellten Hydraulikfluid.The invention relates to a device for controlling the main drive of a hydraulically driven fineblanking press, with a arranged in the foot master cylinder, in which the pressure chambers with hydraulic fluid acted upon, a lifting movement between UT and OT in the direction Hubachse exporting and a table top carrying main piston / plunger is performed, with guided in Schnellhubzylinders, pressurized with hydraulic fluid pressure chambers double-acting Schnellhubkolben with piston rods for rapid traverse / Tasthub of the main piston and table top and with at least one hydraulic pump unit comprehensive hydraulic system for supplying the pressure chambers with the set to a predetermined working pressure by a central control hydraulic fluid.
Die Erfindung betrifft weiterhin ein Verfahren zum Steuern des Hauptantriebes einer hydraulisch angetriebenen Feinschneidpresse mit in einem Hauptzylinder des Fußstückes geführten, eine Tischplatte tragenden Hauptkolben, welcher eine Hubbewegung zwischen UT und OT ausführt, bei dem der Hauptkolben mit Tischplatte durch Druckbeaufschlagung der Druckräume eines im Schnellhubzylinder angeordneten Schnellhubkolbens im Eilgang/Tasthub zwischen UT und OT oder OT und UT verfahren wird, sodann der Eilgang/Tasthub beendet und anschließend der Hauptkolben im Krafthub die Schneid- oder Umformoperation ausführt, wobei die Druckräume des Hauptkolbens mit einem von einer zentralen Steuerung vorgegebenen und durch eine Hydraulikpumpeneinheit erzeugten Arbeitsdruck eines Hydraulikfluids aus einem Hydrauliksystem beaufschlagt werden.The invention further relates to a method for controlling the main drive of a hydraulically driven fineblanking press guided in a master cylinder of the foot, carrying a table top main piston, which performs a lifting movement between UT and OT, in which the main piston arranged with table top by pressurizing the pressure chambers of a Schnellhubzylinder Schnellhubkolbens in rapid traverse / Tasthub between UT and OT or OT and UT is moved, then the rapid traverse / Tasthub terminated and then the main piston in the power stroke performs the cutting or forming operation, the pressure chambers of the main piston with a predetermined by a central control and by a Hydraulic pump unit generated working pressure of a hydraulic fluid from a hydraulic system can be acted upon.
Der Feinschneidvorgang erfordert spezielle dreifachwirkende Pressen, die grundsätzlich von unten nach oben arbeiten und eine kontrollierte Steuerung des Schneidvorgangs mit den Nebenfunktionen für die Ringzacke, Gegenhalter und Auswerfer ermöglichen. Die Ringzackenkraft und Gegenhaltekraft werden hydraulisch und die Schneidkraft mechanisch oder hydraulisch erzeugt.The fineblanking process requires special triple-action presses that basically operate from the bottom up, allowing controlled control of the cutting process with the auxiliary functions for the ring point, anvil and ejector. The ring-tooth force and counter-holding force are generated hydraulically and the cutting force is generated mechanically or hydraulically.
Es gibt eine Vielzahl von Kolbenanordnungen, die in Pressen zum Antrieb oder Druckbeaufschlagung eingesetzt werden.
Beim Stand der Technik nach
According to the state of the art
Aus der
Die
Die Grundidee dieses bekannten Standes der Technik ist es, die Hydraulikflüssigkeit während des Umformvorganges aus der zweiten Arbeitskammer über eine Pumpe in den Vorratstank abzuleiten.The
The basic idea of this known prior art is to derive the hydraulic fluid during the forming process from the second working chamber via a pump in the storage tank.
Eilgangzylinder beim Zustellhub des Pressenstößels vorzusehen, sind aus einer Vielzahl von Lösungen bekannt (
Bei allen diesen bekannten Lösungen gehören Hauptkolben und der Eilgangkolben zu getrennten hydraulischen Kreisen, in denen die aus den Arbeitsräumen verdrängte Hydraulikflüssigkeit bei Abwärtsbewegung der Kolben entweder in einen Tank (
Diese Umschichtung erfolgt in separat verlegten Hydraulikleitungen und unabhängig von der Lage der Schnellhubkolben im Schnellhubzylinder. Die Schnellhubzylinder sind grundsätzlich am Kopfstück der Presse angeordnet und müssen daher in der Lage sein, den gesamten oberen Aufbau der Presse einschließlich Traverse zu tragen und beim Zustellhub zu liften. Der Hauptantrieb/Stößel dieser bekannten Pressen ist mit keinem Eilgang bzw. Schnellhubzylinder ausgerüstet, so dass die Taktzeit bzw. die erreichbare Hubzahl entsprechend gering ist.To provide rapid traverse cylinder during the delivery stroke of the press ram, are known from a variety of solutions (
In all of these known solutions, the main piston and the rapid-action piston belong to separate hydraulic circuits, in which the displaced from the work spaces Hydraulic fluid as the pistons move down either into a tank (
This shift takes place in separately installed hydraulic lines and independent of the position of the quick-lift pistons in the quick-lift cylinder. The Schnellhubzylinder are basically arranged on the head of the press and therefore must be able to carry the entire upper structure of the press including Traverse and to lift the Zustellhub. The main drive / plunger of these known presses is equipped with no rapid traverse or Schnellhubzylinder, so that the cycle time or the achievable number of strokes is correspondingly low.
Bei diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung und ein Verfahren zum Steuern des Hauptantriebes einer hydraulisch angetriebenen Feinschneidpresse zu schaffen, deren hydraulische Schaltung durch Wegfall von Hydraulikleitungen vereinfacht und die Hydraulikfluidmenge unter gleichzeitiger Erhöhung der Hubzahl bei einfacher Konstruktion der Presse reduziert werden kann.In this prior art, the present invention seeks to provide an apparatus and a method for controlling the main drive of a hydraulically driven fineblanking press, simplifies the hydraulic circuit by eliminating hydraulic lines and reduces the hydraulic fluid amount while increasing the number of strokes with simple construction of the press can be.
Diese Aufgabe wird durch eine Vorrichtung der eingangs genannten Art mit den Merkmalen des Anspruches 1 und durch ein Verfahren mit den Merkmalen des Anspruchs 10 gelöst.This object is achieved by a device of the type mentioned above with the features of
Vorteilhafte Ausgestaltungen der erfindungsgemäßen Vorrichtung und des Verfahrens sind den Unteransprüchen entnehmbar.Advantageous embodiments of the invention Apparatus and method are the dependent claims.
Die erfindungsgemäße Lösung geht von der Erkenntnis aus, das in den Druckräumen des Hauptkolbens befindliche Hydraulikfluid während dem Eilgang/Tasthub beim Zustellen in Hubrichtung der Schnellhubkolben von einem Druckraum in den anderen Druckraum des Hauptkolbens zu verdrängen.
Dies wird dadurch erreicht, dass der Hauptkolben diskusscheibenartig vorstehende Arbeitsflächen aufweist, die im Hauptzylinderraum übereinanderliegend den ersten (oberen) und zweiten (unteren) Druckraum mit geringem Hub abteilen, denen mit dem Hydrauliksystem in Verbindung stehende erste (obere) Fluidkanäle und zweite (untere) Fluidkanäle im Fußstück zugeordnet sind, wobei die ersten Fluidkanäle mit den zweiten Fluidkanälen durch je einen im Fußstück angeordneten Umgehungskanal verbunden sind, der mit diesen Kanälen und den Druckräumen ein inneres hydraulisches System bildet, das im Eilgang durch druckgesteuerte Proportionalventile beim Verdrängen des Hydraulikfluids aus dem ersten in den zweiten Druckraum geöffnet und im Krafthub geschlossen ist, und dass während des Krafthubes mindestens ein zweiter Fluidkanal ein Krafthubkanal ist und der erste Druckraum mit einem Entlastungskanal verbunden ist, wobei dieser Fluidkanal zum Zuführen von Hydraulikfluid vorgegebenen Drucks in den zweiten Druckraum mit einem Zuleitungskanal und Abzweigkanal und der Entlastungskanal zum Abführen des aus dem ersten Druckraum verdrängten Hydraulikfluids über ein Tankventil mit einem Auffangtank in Verbindung stehen.The solution according to the invention is based on the knowledge of displacing the hydraulic fluid in the pressure chambers of the main piston during the rapid traverse / key stroke during delivery in the stroke direction of the quick-lift pistons from one pressure chamber into the other pressure chamber of the main piston.
This is achieved in that the main piston discusscheibenartig projecting work surfaces, the superimposed in the master cylinder space the first (upper) and second (lower) pressure chamber with low lift, which communicating with the hydraulic system in connection first (upper) fluid channels and second (lower) Fluid channels are assigned in the foot piece, wherein the first fluid channels are connected to the second fluid channels by a respective arranged in the foot bypass channel, which forms an internal hydraulic system with these channels and the pressure chambers, in rapid traverse by pressure-controlled proportional valves when displacing the hydraulic fluid from the first is opened in the second pressure chamber and closed in the power stroke, and that during the power stroke, at least one second fluid channel is a Krafthubkanal and the first pressure chamber is connected to a discharge channel, said fluid channel for supplying hydraulic fluid predetermined Dru cks in the second pressure chamber with a supply channel and branch channel and the discharge channel for discharging the displaced from the first pressure chamber hydraulic fluid via a tank valve with a collecting tank in connection.
Nach einer weiteren bevorzugten Ausgestaltung der erfindungsgemäßen Vorrichtung ist vorgesehen, dass der zweite Druckraum des Hauptkolbens beim Krafthub über ein Sicherheitsventil, mindestens einen Druckaufnehmer zur Druckdetektion, mindestens ein Druckbegrenzungsventil zur Druckbegrenzung des Förderstromes und ein Proportionalventil zum Einstellen der Fördermenge mit der Hydraulikpumpeneinheit verbunden ist.According to another preferred embodiment of Device according to the invention is provided that the second pressure chamber of the main piston is connected to the hydraulic pump unit during power stroke via a safety valve, at least one pressure sensor for pressure detection, at least one pressure relief valve to limit the pressure of the flow and a proportional valve for adjusting the flow rate.
In einer weiteren bevorzugten Ausgestaltung der erfindungsgemäßen Vorrichtung kann der Hauptkolben gleiche oder unterschiedlich große Arbeitsflächen aufweisen, wodurch sowohl Gleichlaufkolben als auch andere Kolben je nach Einsatzfall zur Anwendung kommen können.In a further preferred embodiment of the device according to the invention, the main piston may have the same or different sized work surfaces, whereby both constant velocity piston and other pistons can be used depending on the application.
Vorteilhaft ist es auch, wenn die Proportionalventile und das Tankventil druckgesteuerte Einbauventile sind.It is also advantageous if the proportional valves and the tank valve are pressure-controlled cartridge valves.
Eine weitere bevorzugte Ausgestaltung der erfindungsgemäßen Vorrichtung sieht vor, dass der Schnellhubkolben Druckräume mit unterschiedlich großen Wirkflächen im Schnellhubzylinder abteilt, die über im Fußstück angeordnete Kanäle an das Hydrauliksystem angeschlossen sind, wobei der Druckraum mit der größeren Wirkfläche in einen Hydraulikstrang aus entsperrbarem Rückschlagventil, 4/3-Wege-Proportionalventil, steuerbarem Proportionalventil und Hochdruckspeicher eingebunden und der Druckraum mit der kleineren Wirkfläche über das 4/3-Wege-Proportionalventil mit dem Auffangtank verbunden ist.
Die unterschiedlichen großen Wirkflächen am Schnellhubkolben ermöglichen es, den Eilgang in Aufwärts- und Abwärtsrichtung mit unterschiedlichen Geschwindigkeiten auszuführen. Zweckmäßigerweise ist die größere Wirkfläche des Schnellhubkolbens der Aufwärtsbewegung zugeordnet.A further preferred embodiment of the device according to the invention provides that the quick-lift piston divides pressure chambers with different sized effective surfaces in the quick-lift cylinder, which are connected via channels arranged in the footpiece to the hydraulic system, wherein the pressure chamber with the larger effective area in a hydraulic train of non-returnable check valve, 3-way proportional valve, controllable proportional valve and high-pressure accumulator integrated and the pressure chamber with the smaller effective area via the 4/3-way proportional valve is connected to the collecting tank.
The different large effective surfaces on the quick-lift piston make it possible to execute the rapid traverse in the upward and downward direction at different speeds. Conveniently, the larger effective surface of the quick-lift piston is associated with the upward movement.
Es hat sich als vorteilhaft erwiesen, dass zwei gegenüberliegende, parallel zur Hubachse ausgerichtete Schnellhubzylinder im Fußstück aufgenommen sind, deren Kolbenstangen jeweils mit einem Träger verbunden sind, welche je an einer Seite der Tischplatte befestigt sind.
Die Schnellhubzylinder sind an der Oberseite des Fußstückes mit je einem Deckel druckdicht verschlossen, so dass eine leichte Montage und Zugänglichkeit gewährleistet ist.It has proved to be advantageous that two opposite, aligned parallel to the stroke axis Schnellhubzylinder are accommodated in the foot, the piston rods are each connected to a carrier, which are each attached to one side of the table top.
The Schnellhubzylinder are pressure-sealed at the top of the foot piece, each with a lid, so that easy installation and accessibility is guaranteed.
Von Vorteil ist auch, dass dem Hauptkolben eine Weg-Mess-Einheit zum Erfassen der OT-Lage des Hauptkolbens und dem ersten Druckraum des Hauptkolbens das Tankventil zum Aufbau einer Gegenkraft zur Reduzierung des Schnittschlags zugeordnet ist.It is also advantageous that the main piston is associated with a path-measuring unit for detecting the TDC position of the main piston and the first pressure chamber of the main piston, the tank valve to build up a counterforce to reduce the cutting stroke.
Nach einer bevorzugten Ausführungsform der Erfindung umfasst die Hydraulikpumpeneinheit mindestens ein Proportionalventil zum Einstellen der Fördermenge, mindestens einen Druckaufnehmer für die Ansteuerung des Proportionalventils und mindestens ein Druckbegrenzungsventil zur Druckbegrenzung und Haltung des Förderstromes.According to a preferred embodiment of the invention, the hydraulic pump unit comprises at least one proportional valve for adjusting the delivery rate, at least one pressure sensor for the control of the proportional valve and at least one pressure relief valve for limiting the pressure and attitude of the flow.
Die Aufgabe der Erfindung wird weiterhin durch ein Verfahren dadurch gelöst, dass die Druckräume des Schnellhubkolbens beim Eilgang/Tasthub von einem permanent auf Arbeitsdruck gespannten Hochdruckspeicher gespeist werden und gleichzeitig die Druckräume des Hauptkolbens vom Hydrauliksystem getrennt sowie über Fluidkanäle und Umgehungskanäle verbunden werden, so dass das Hydraulikfluid vom ersten Druckraum in den zweiten Druckraum in Hubrichtung des Schnellhubkolbens während des Eilgangs nahezu drucklos verdrängt wird.The object of the invention is further achieved by a method in that the pressure chambers of Schnellhubkolbens are fed at rapid traverse / Tasthub of a permanently pressurized high pressure accumulator and at the same time the pressure chambers of the main piston separated from the hydraulic system and connected via fluid channels and bypass channels, so that hydraulic fluid is displaced from the first pressure chamber in the second pressure chamber in the stroke direction of the quick-lift piston during the rapid traverse almost without pressure.
Von wesentlicher Bedeutung für die Steuerung der Druckräume des Schnellhubkolbens ist es, dass der Arbeitsdruck im Druckraum des Schnellhubkolbens mit der größeren Wirkfläche von der zentralen Steuerung über ein entsperrbares Rückschlagventil, 4/3-Wege-Proportionalventil, steuerbarem Proportionalventil und Hochdruckspeicher sowie der Arbeitsdruck im Druckraum des Schnellhubkolbens mit der kleineren Wirkfläche über das 4/3-Wege-Proportionalventil eingestellt wird.Of essential importance for the control of the pressure chambers of the quick-lift piston is that the working pressure in the pressure chamber of the quick-release piston with the larger effective area of the central control via a pilot operated check valve, 4/3-way proportional valve, controllable proportional valve and high-pressure accumulator and the working pressure in the pressure chamber of the quick-lift piston with the smaller effective area is set via the 4/3-way proportional valve.
In einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird der Arbeitsdruck im unteren Druckraum des Hauptkolbens beim Krafthub mit der zentralen Steuerung über ein ansteuerbares Proportionalventil, mindestens einen Druckaufnehmer zur Druckdetektion, mindestens ein Druckbegrenzungsventil zur Druckbegrenzung des Förderstromes und ein Proportionalventil für das Fördervolumen und der Hydraulikpumpeneinheit sowie der Arbeitsdruck im ersten Druckraum über das Proportionalventil eingestellt.In a further embodiment of the method according to the invention, the working pressure in the lower pressure chamber of the main piston at the power stroke with the central control via a controllable proportional valve, at least one pressure sensor for pressure detection, at least one pressure relief valve to limit the pressure of the flow and a proportional valve for the delivery volume and the hydraulic pump unit and the Working pressure in the first pressure chamber adjusted via the proportional valve.
Von besonderem Vorteil ist, dass die OT-Lage des Hauptkolbens über ein Weg-Mess-System mit der zentralen Steuerung eingestellt wird, wobei das Fördervolumen der Hydraulikpumpeneinheit vor Erreichen des OT zurückgeregelt oder mit dem Tankventil im ersten Druckraum ein Gegendruck erzeugt wird.It is particularly advantageous that the TDC position of the main piston is adjusted via a distance measuring system with the central control, wherein the delivery volume of the hydraulic pump unit is regulated back before reaching TDC or with the tank valve in the first pressure chamber, a back pressure is generated.
Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung unter Bezugnahme auf die beigefügten Zeichnungen.Further advantages and details arise from the description below with reference to the accompanying drawings.
Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail below using an exemplary embodiment.
Es zeigen
-
Fig. 1 eine perspektivische Ansicht einer Feinschneidpresse mit Anschluss an das Hydrauliksystem, -
Fig. 2 eine perspektivische Ansicht des Fußstückes mit Tischplatte, -
Fig. 3 einen Schnitt des Fußstückes mit Tischplatte gemäß Linie A-A derFig. 2 , -
Fig. 4a und4b eine perspektivische Ansicht des Fußstückes mit Darstellung der Lage der Fluidkanäle und des Entlastungskanals, -
Fig. 5 einen Schnitt des Fußstücks mit Tischplatte gemäß Linie B-B derFig. 2 , -
Fig. 6 einen Schnitt des Fußstücks mit Tischplatte gemäß'Linie C-C derFig. 2 , -
Fig. 7a und7b schematische Darstellungen der Verdrängung des Hydraulikfluids von einem Druckraum in den anderen Druckraum des Hauptkolbens in Abhängigkeit der Hublage der Schnellhubkolben und -
Fig. 8 eine schematische Darstellung des Ablaufs des erfindungsgemäßen Verfahrens.
-
Fig. 1 a perspective view of a fine blanking press with connection to the hydraulic system, -
Fig. 2 a perspective view of the foot piece with table top, -
Fig. 3 a section of the foot piece with table top according to line AAFig. 2 . -
Fig. 4a and4b a perspective view of the foot piece showing the position of the fluid channels and the discharge channel, -
Fig. 5 a section of the foot piece with table top according to line BBFig. 2 . -
Fig. 6 a section of the foot piece with table top according to'Line CC theFig. 2 . -
Fig. 7a and7b schematic representations of the displacement of the hydraulic fluid from a pressure chamber in the other pressure chamber of the main piston in dependence of Hublage of the quick-lift piston and -
Fig. 8 a schematic representation of the sequence of the method according to the invention.
Die
Wie die
Die
Im Fußstück 5 ist ein Hauptzylinderraum 19 ausgebildet, dessen Achse HA auf der Hubachse HU der Feinschneidpresse liegt und den doppelt wirkenden Hauptkolben 20 aufnimmt. Der Hauptkolben 20 besitzt einen zylindrischen Schaft 21, welcher diskusscheibenartig senkrecht zur Achse HA vorspringende Arbeitsflächen 22a und 22b aufweist, die den Hauptzylinderraum 19 in einen ersten (oberen) Druckraum 23a und einen zweiten (unteren) Druckraum 23b mit geringer Hubhöhe aufteilt, so dass das Fußstück 5 kompakt ist und eine geringe Bauhöhe hat.
Der Hauptzylinderraum 19 und somit der Druckraum 23a ist durch einen Deckel 27 druckdicht verschlossen, welcher am Fußstück 5 befestigt ist.
In die Druckräume 23a und 23b des Hauptkolbens 20 führen die im Fußstück 5 senkrecht zur Hubachse HU entsprechend der Höhenlage der Druckräume 23a und 23b übereinander liegenden ersten (oberen) Fluidkanäle 24a, 24b, 24c und 24d sowie die zweiten (unteren) Fluidkanäle 24e, 24f, 24g und 24h. Die Fluidkanäle 24a bis 24d sind mit den Fluidkanälen 24e bis 24h durch je einen Umgehungskanal 26 verbunden.
Des Weiteren ist in jeden der zweiten (unteren) Fluidkanäle 24e bis 24h jeweils ein druckgesteuertes Proportionalventil 25a, 25b, 25c und 25d als Einbauventil eingesetzt ist, das den jeweiligen Umgehungskanal 26 schließt, wenn der zweite Druckraum 23b mit Hydraulikfluid vorgegebenen Drucks aus dem Hydrauliksystem 18 beaufschlagt wird.
Im Eilgang führt der Hauptkolben 20 eine entsprechende Hubbewegung zwischen unterem Totpunkt UT und oberen Totpunkt OT aus und verdrängt bei geöffnetem Proportionalventil 25a bis 25d das im ersten (oberen) Druckraum 23a befindliche Hydraulikfluid über die ersten (oberen) Fluidkanäle 24a bis 24d, die Umgehungskanäle 26 und die zweiten (unteren) Fluidkanäle 24e bis 24h in den zweiten (unteren) Druckraum 23b. Der erste (obere) Druckraum 23a, die ersten (oberen) Fluidkanäle 24a bis 24d, die Umgehungskanäle 26, die unteren Fluidkanäle 24e bis 24h und der zweite (untere) Druckraum 24b bilden somit ein geschlossenes hydraulisches System, das je nach Stellung der Proportionalventile 25a bis 25d geöffnet oder geschlossen werden kann, so dass der erste (obere) Druckraum 23a und zweite (untere) Druckraum 23b nahezu drucklos sind und das Hydraulikfluid in den zweiten (unteren) Druckraum 23b des Hauptkolbens 20 verdrängt wird sowie eine Fluidsäule in Bewegungsrichtung BR der Schnellhubkolben 10 während des Eilganges aufgebaut werden kann.
Erreicht der Schnellhubkolben im Eilgang seine Soll-Position, schalten die Proportionalventile 25a bis 25d in die Schließstellung und der Krafthub beginnt, welcher nachfolgend mit der
In the
The
The first (upper)
Further, in each of the second (lower)
In rapid traverse, the
If the fast-stroke piston reaches its setpoint position in rapid traverse, the
Die
In den ersten Druckraum 23a des Hauptkolbens 20 mündet der Entlastungskanal 29 und in den zweiten Druckraum 23b der Fluidkanal 24e, die senkrecht zur Hubachse HU entsprechend der Höhenlage der Druckräume 23a und 23b übereinander liegend angeordnet sind.
In den Entlastungskanal 29 ist ein Tankventil 30 zum Öffnen und Schließen des Entlastungskanals 29 als Einbauventil eingesetzt, das in Offenstellung ist, wenn im Krafthub das im Druckraum 23a befindliche Hydraulikfluid zum Auffangtank 44 verdrängt wird.
Der Fluidkanal 24e ist mit einem parallel zur Hubachse HU im Fußstück 5 liegenden Zuleitungskanal 32 und einen von diesen abgehenden Abzweigkanal 33 verbunden, über den das weiter nicht dargestellte Hydrauliksystem 18 angeschlossen ist.The
In the
In the
The
In den
Der Hauptkolben 20 mit Tischplatte 8 führt durch den Schnellhubkolben 10 einen Hub in Richtung OT aus. Das im ersten (oberen) Druckraum 23a befindliche Hydraulikfluid wird durch die Aufwärtsbewegung der Arbeitsfläche 22a des Hauptkolbens 20 bei geschlossenem Tankventil 30 aus dem ersten (oberen) Druckraum 23a verdrängt und gelangt bei geöffnetem Proportionalventil 25a über den ersten Fluidkanal 24a, den Umgehungskanal 26, den zweiten Fluidkanal 24e in den unteren Druckraum 23b. Die Verdrängung ist durch einen Pfeil in der
The
Der Ablauf des erfindungsgemäßen Verfahrens wird anhand der
Zum Hydraulikstrang 41 gehören ein Hochdruckspeicher 34 für Hydraulikfluid, ein von der zentralen Steuerung 35 angesteuertes logisches Proportionalventil 36, welches mit dem Hydrauliksystem 18 über die Hydraulikleitung 17 verbunden ist und das Druckniveau im Hochdruckspeicher 34 einstellt, ein Druckaufnehmer 38, ein Sicherheitsventil 39, ein 4/3-Wege-Proportionalventil 37, welches das Hydraulikfluid entsprechend der Stellung des Schnellhubkolbens 10 im Schnellhubzylinder 9 auf die Druckräume 15a oder 15b zu- oder abschaltet, ein dem unteren Druckraum 15b zugeordnetes entsperrbares Rückschlagventil 43 und die Druckräume 15a und 15b der Schnellhubkolben 10.
Die Druckräume 15a und 15b des Schnellhubkolbens 10 werden über den gemeinsamen Hochdruckspeicher 34 mit Hydraulikfluid entsprechenden Drucks versorgt, der durch eine entsprechende Ansteuerung des Ventils 36 von der zentralen Steuerung 35 als Speicherladung eingestellt wird.
Sobald der Schnellhubkolben im Eilgang seine obere Soll-Lage erreicht, schließt das in den Fluidkanal 24e eingebaute Proportionalventil 25a, das Tankventil 30 öffnet und das 4/3-Wege-Proportionalventil 37 schaltet in eine Mittelstellung. Der Fluidkanal 24e nimmt dann die Funktion eines Krafthubkanals an, in dem Hydraulikfluid vorgegebenen Drucks in den zweiten Druckraum 23b zugeführt wird.The
The
As soon as the fast-stroke piston reaches its upper setpoint position in rapid traverse, the
Der Hydrauklikstrang 42 für den Krafthub umfasst eine Hydraulikpumpeneinheit 40, der mindestens ein Proportionalventil 45 zum Einstellen der Fördermenge, mindestens ein Druckbegrenzungsventil 46 zur Druckbegrenzung des Förderstroms und mindestens ein Druckaufnehmer 47 zur Druckdetektion für die Leistungsbegrenzung und Weitergabe des Druckwertes an die zentrale Steuerung 35 zur Ansteuerung des Druckbegrenzungsventils 46 zugeordnet ist, ein Sicherheitsventil 48, welches das in den unteren Druckraum 23b geführte Hydraulikfluid zu- oder wegschaltet, einen Druckaufnehmer 49 zur Ermittlung des Druckwertes, der zur Ansteuerung des Druckbegrenzungsventils 46 an die zentrale Steuerung übergeben wird, und die Druckräume 23a bzw. 23b des Hauptkolbens 20.
Hat der Hauptkolben 20 seinen oberen Totpunkt OT erreicht, ist der Krafthub beendet. Das Sicherheitsventil 48 für den Krafthub und das Tankventil 30 schließen, gleichzeitig öffnen das Proportionalventil 25a für den Fluidkanal 24e und das Proportionalventil 37 zur Zuführung von Hydraulikfluid aus dem Hochdruckspeicher 34 und der Eilgang setzt ein, in dem der obere Druckraum 15a des Schnellhubkolbens 10 mit Hydraulikfluid vorgegebenen Drucks beaufschlagt wird, so dass der Hauptkolben 20 zusammen mit der Tischplatte 8 abgesenkt wird und seine untere Soll-Lage erreicht. Das 4/3-Wege-Proportionalventil 37 schaltet um, so dass der untere Druckraum 15b mit Hydraulkikfluid beaufschlagt werden kann und der Schnellhubkolben 10 in Richtung seiner oberen Soll-Lage bewegt wird.
Sobald der Schnellhubkolben seine obere Soll-Lage erreicht, setzt ein erneuter Krafthub ein.
If the
As soon as the fast-stroke piston reaches its upper setpoint position, a renewed power stroke commences.
Claims (13)
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EP15002015.4A EP3115190B1 (en) | 2015-07-06 | 2015-07-06 | Device and method for controlling the principal drive of a precision cutting press |
ES15002015T ES2839073T3 (en) | 2015-07-06 | 2015-07-06 | Device and procedure for controlling the main drive of a precision punch press |
CN201610524423.2A CN106335210B (en) | 2015-07-06 | 2016-07-05 | Device and method for controling the main drive of fine press |
JP2016133066A JP6781579B2 (en) | 2015-07-06 | 2016-07-05 | Equipment and methods for controlling the main drive of a precision punching press |
KR1020160084633A KR102349812B1 (en) | 2015-07-06 | 2016-07-05 | Device and Method for Controlling the Primary Drive of a Fine Blanking Press |
US15/203,463 US10479040B2 (en) | 2015-07-06 | 2016-07-06 | Device and method for controlling the primary drive of a fine blanking press |
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CN110656940B (en) * | 2019-09-30 | 2021-03-02 | 中国铁建重工集团股份有限公司 | Shaft heading machine and main drive sealing system thereof |
CN112589707A (en) * | 2020-12-15 | 2021-04-02 | 芜湖科捷铝业科技有限公司 | Door and window aluminium alloy processing frock convenient to adjust |
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2015
- 2015-07-06 EP EP15002015.4A patent/EP3115190B1/en active Active
- 2015-07-06 ES ES15002015T patent/ES2839073T3/en active Active
-
2016
- 2016-07-05 KR KR1020160084633A patent/KR102349812B1/en active IP Right Grant
- 2016-07-05 JP JP2016133066A patent/JP6781579B2/en active Active
- 2016-07-05 CN CN201610524423.2A patent/CN106335210B/en active Active
- 2016-07-06 US US15/203,463 patent/US10479040B2/en active Active
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DE2218476A1 (en) | 1972-03-03 | 1973-09-20 | Hydrel Ag | FINE PUNCH PRESS |
US4155300A (en) * | 1977-04-05 | 1979-05-22 | Smg Suddeutsche Maschinenbau-Gesellschaft Mbh | Press |
EP0311779B1 (en) | 1987-10-10 | 1993-10-27 | Robert Bosch Gmbh | Hydraulic control system for a press |
EP0501596A2 (en) * | 1991-02-28 | 1992-09-02 | MANNESMANN Aktiengesellschaft | Hydraulic press for materials in powder form |
GB2271149A (en) * | 1992-09-22 | 1994-04-06 | P J Hare Limited | Hydraulic press |
EP0615837B1 (en) | 1993-03-16 | 1997-05-02 | Maschinenfabrik Müller-Weingarten Ag | Drive control method for a hydraulic press and apparatus for carrying out the method |
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DE19524042A1 (en) | 1994-07-01 | 1996-03-21 | Mueller Weingarten Maschf | Drive for hydraulic presses with high stroke rate |
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DE19822436A1 (en) | 1998-04-08 | 1999-10-14 | Mannesmann Rexroth Ag | Operating hydraulic press the force drop during changeover from the fast motion to the forming motion is reduced |
DE10215003A1 (en) | 2002-02-13 | 2003-08-28 | Horst Baltschun | Hydraulic press used for deep drawing operations has press body connected to two columns in each of three piston and cylinder assemblies |
EP1420169A2 (en) * | 2002-11-15 | 2004-05-19 | Kubota Iron Works Co., Ltd. | Double-acting hydraulic press |
DE102004006126B4 (en) | 2004-02-07 | 2006-12-28 | Horst Baltschun | Press with locked ram |
DE102009058407A1 (en) | 2009-12-15 | 2011-06-16 | Robert Bosch Gmbh | Hydraulic press drive |
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Also Published As
Publication number | Publication date |
---|---|
US10479040B2 (en) | 2019-11-19 |
JP6781579B2 (en) | 2020-11-04 |
EP3115190B1 (en) | 2020-11-18 |
JP2017013133A (en) | 2017-01-19 |
KR102349812B1 (en) | 2022-01-11 |
CN106335210A (en) | 2017-01-18 |
ES2839073T3 (en) | 2021-07-05 |
KR20170005768A (en) | 2017-01-16 |
US20170120551A1 (en) | 2017-05-04 |
CN106335210B (en) | 2019-06-21 |
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