EP3580054B1 - Press having a double-acting hydraulic cylinder - Google Patents
Press having a double-acting hydraulic cylinder Download PDFInfo
- Publication number
- EP3580054B1 EP3580054B1 EP18702671.1A EP18702671A EP3580054B1 EP 3580054 B1 EP3580054 B1 EP 3580054B1 EP 18702671 A EP18702671 A EP 18702671A EP 3580054 B1 EP3580054 B1 EP 3580054B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- double
- press
- hydraulic cylinder
- ram
- connecting rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 claims description 9
- 238000004080 punching Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
- B30B1/265—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks using a fluid connecting unit between drive shaft and press ram
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0029—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height
- B30B15/0035—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height using an adjustable connection between the press drive means and the press slide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
- B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
Definitions
- the subject of this invention is a method for operating a press or a stamping machine, in which a ram is driven in an oscillating manner by a drive via an eccentric shaft and at least one connecting rod, the at least one connecting rod being rotatably mounted on the eccentric shaft at one end and at the other End is connected to the plunger.
- Such presses have been known for a long time.
- the ram moves back and forth between a lower and an upper dead center.
- the pressing or punching force is fed directly into the ram via one or usually several connecting rods (2- or 4-point press).
- Adjustment options are also provided to adjust the stroke. This is usually done via an eccentric bushing.
- the position of the tappet can also be set using a ball spindle at the lower end of the connecting rod (tappet adjustment).
- the U.S. 3,552,182 A , U.S. 3,005,404 A and DE 35 07 327 A1 describe presses with double-acting hydraulic cylinders in the connecting rod shaft.
- the distance between the ram and the workpiece can be adjusted via these hydraulic cylinders, and the hydraulic cylinders also serve as overload protection.
- the JP H03 238200 A discloses a single-acting hydraulic cylinder which is controlled by means of a magnetic switch.
- the US 2014/208964 A1 discloses a press that can be vibrated.
- the ram is divided into two parts, so that it consists of a main ram and a sub-ram.
- the main slide and the lower slide form a cylinder-piston mechanism.
- the invention is based on the object of providing a method for operating a press or an automatic punching machine, in which the punching or reshaping process is improved.
- the double-acting hydraulic cylinder according to the invention also makes work on the open tool particularly easier.
- the ram is moved to the top dead center with the help of the eccentric drive and then the lift stroke is activated via the double-acting hydraulic cylinder.
- the lift lift for example, has an opening path of 140 mm. With a press stroke of 160 mm, a maximum opening path of 300 mm can be achieved. This means that the pressing tool is easily accessible for visual checks or for work on it (e.g. grinding work).
- the double-acting hydraulic cylinder can be used to increase the overload travel. This also guarantees more efficient tool protection.
- the hydraulic cylinder can also have the function of a
- the double-acting cylinder can also be used to implement a quick lift stroke of the ram or, if necessary, to act as an overload protection device when a check is required or when work is being carried out on the tool.
- the press is operated in such a way that the working stroke of the press is carried out only by the double-acting cylinder or cylinders, the hydraulic cylinder being operated in a vibrating manner.
- the upper end of the connecting rod is in the upper (0 ° position) or lower dead center (180 ° position) so that no rotational forces are introduced into the eccentric shaft. If there are several connecting rods, all double-acting cylinders in the respective connecting rods are operated to vibrate.
- FIG. 1 shows an example of a press 1 with a press table 2, side stands 3 and a head piece 4.
- the eccentric shaft 5 is rotatably mounted in the head piece 4.
- a drive 6 drives the eccentric shaft 5 via the drive belt 7 and the flywheel 8.
- two eccentric bushings 32 are arranged, on each of which the upper end 30 of the connecting rod 9 is rotatably mounted via a roller bearing 14.
- the upper end 30 of the connecting rod 9 is composed of two halves 15, 16 screwed together.
- the lower ends 17 of the two connecting rods 9 are connected to the tappet 10.
- the upper tool part 12, which can be pressed against the lower tool part 11 during operation, is fastened to the ram 10.
- the plunger 10 is guided along the side stand 3 via the roller guide 13.
- FIG. 2 a connecting rod 9 according to the invention is shown in detail.
- a double-acting hydraulic cylinder 27 is arranged in the connecting rod shaft 31 here.
- a piston 22 is arranged within the cylinder 25. Hydraulic fluid can be applied to the pressure chamber 23 or the annular chamber 28 via the lines 24 or 26 and the piston 22 can thus be raised or lowered become.
- the vibrating movement of the piston 22 is realized by the rapid alternating application of pressure to the pressure chamber 23 and the annular chamber 28.
- FIG. 3 now shows a functional diagram.
- the plunger 10 can be driven to oscillate in a known manner via the rotating eccentric shaft 5. This enables a ram stroke A to be implemented.
- the stroke B can also be realized.
- the vibrating actuation of the hydraulic cylinder 27 takes place via the magnetic switch 29.
- the magnetic switch 29 alternately acts on the upper pressure chamber 23 or the lower annular chamber 28 with the hydraulic fluid, so that the piston 22 vibrates, for example at a frequency of 20 Hz.
- the upper pressure chamber 23 is currently being filled with hydraulic fluid coming from the supply line P via the line 24.
- the lower annular space 28 is emptied into a tank T via the line 26.
- the piston 22 moves the plunger 10 down here. Due to the double-acting hydraulic cylinder 27, the tappet 10 can thus be raised and lowered very quickly and thus operate vibrating.
- the working stroke can be carried out jointly by the eccentric drive and the double-acting hydraulic cylinder 27.
- the eccentric drive moves the vibrating hydraulic cylinder 27 downwards, so that the plunger 10 moves downwards in a vibrating manner.
- the working stroke can also only be realized by the vibrating double-acting hydraulic cylinder 27, with the pressure chamber 23 being supplied in small jolts to the pressure chamber 23 during a working stroke than is subsequently discharged, so that a linear downward movement is superimposed on the vibrating movement of the piston.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press Drives And Press Lines (AREA)
Description
Den Gegenstand dieser Erfindung bildet ein Verfahren zum Betreiben einer Presse oder eines Stanzautomaten, bei dem ein Stößel über eine Exzenterwelle und zumindest einem Pleuel von einem Antrieb oszillierend angetrieben wird, wobei das zumindest eine Pleuel an einem Ende drehbar auf der Exzenterwelle gelagert ist und am anderen Ende mit dem Stößel verbunden ist.The subject of this invention is a method for operating a press or a stamping machine, in which a ram is driven in an oscillating manner by a drive via an eccentric shaft and at least one connecting rod, the at least one connecting rod being rotatably mounted on the eccentric shaft at one end and at the other End is connected to the plunger.
Derartige Pressen sind schon lange bekannt. Der Stößel bewegt sich dabei zwischen einem unteren und einem oberen Totpunkt hin und her. Bei diesen Maschinen wird die Press- oder Stanzkraft direkt über eine oder meist mehrere Pleuel (2- oder 4-Punktpresse) in den Stößel geleitet. Es sind auch eventuell Einstellmöglichkeiten vorgesehen, um den Hub zu verstellen. Dies geschieht in der Regel über eine Exzenterbuchse. Über eine Kugelspindel am unteren Ende des Pleuels kann außerdem die Lage des Stößels eingestellt werden(Stößelverstellung).Such presses have been known for a long time. The ram moves back and forth between a lower and an upper dead center. With these machines, the pressing or punching force is fed directly into the ram via one or usually several connecting rods (2- or 4-point press). Adjustment options are also provided to adjust the stroke. This is usually done via an eccentric bushing. The position of the tappet can also be set using a ball spindle at the lower end of the connecting rod (tappet adjustment).
Die
Die
The
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Betreiben einer Presse oder einen Stanzautomaten bereitzustellen, bei dem der Stanz- oder Umformvorgang verbessert wird.The invention is based on the object of providing a method for operating a press or an automatic punching machine, in which the punching or reshaping process is improved.
Gelöst wird diese Aufgabe durch ein Verfahren zum Betreiben einer Presse oder eines Stanzautomaten gemäß den Merkmalen des Anspruchs 1. Dadurch, dass der Hydraulikzylinder im Pleuel angeordnet ist, bzw. dass in jedem Pleuel ein Hydraulikzylinder angeordnet ist, ergibt sich ein sehr kompakter Aufbau der Presse. Erfindungsgemäß ist der doppeltwirkende Hydraulikzylinder im Pleuelschaft untergebracht. Es ist auch denkbar, dass der Hydraulikzylinder unterhalb einer Überlastsicherung, direkt oberhalb des Stößels angeordnet ist.This object is achieved by a method for operating a press or a stamping machine according to the features of
Manchmal ist es notwendig, zwischen Werkzeugoberteil und Werkzeugunterteil eine Kontrolle durchzuführen oder auch Arbeiten an den Werkzeugen. Dazu wird über die Exzenterwelle der Stößel in den oberen Totpunkt gefahren, zusätzlich wird die Stößelverstellung betätigt und mit Hilfe der Kugelspindel der Stößel weiter nach oben gefahren, um dadurch mehr Platz zwischen den Werkzeugen zur Verfügung zu haben. Durch diesen Vorgang wird aber nur ein recht begrenzter Freiraum zwischen Werkzeugoberteil und Werkzeugunterteil zur Verfügung gestellt. Außerdem nimmt das Anheben des Stößels über die Stößelverstellung viel Zeit in Anspruch.
Insbesondere bei Try-Out-Einarbeitungspressen ist dies sehr nachteilig, da hier sehr häufig Werkzeugkontrollen durchgeführt werden müssen.Sometimes it is necessary to carry out a check between the upper part of the tool and the lower part of the tool or to work on the tools. To do this, the tappet is moved to top dead center via the eccentric shaft, the tappet adjustment is actuated and the tappet continues upwards with the aid of the ball screw in order to have more space between the tools. However, this process only provides a very limited free space between the upper tool part and the lower tool part. In addition, it takes a long time to raise the ram using the ram adjustment.
This is particularly disadvantageous in try-out training presses, since tool checks have to be carried out very often here.
Da nun erfindungsgemäß im Kraftstrang zwischen Exzenterwelle und Stößel ein doppeltwirkender Hydraulikzylinder vorgesehen ist, lässt sich damit auch ein Schnell-Lifthub realisieren.Since, according to the invention, a double-acting hydraulic cylinder is now provided in the power train between the eccentric shaft and the ram, a quick lift stroke can also be implemented with it.
Durch den erfindungsgemäßen doppeltwirkenden Hydraulikzylinder werden also auch Arbeiten am offenen Werkzeug besonders vereinfacht.
Der Stößel wird mit Hilfe des Exzenterantriebes auf den oberen Totpunkt gefahren und dann wird über den doppeltwirkenden Hydraulikzylinder der Lifthub aktiviert. Der Lifthub hat beispielsweise einen Öffnungsweg von 140 mm. Mit einem Pressenhub von 160 mm lässt sich somit ein maximaler Öffnungsweg von 300 mm realisieren. Dadurch ist das Presswerkzeug für optische Kontrollen oder für Arbeiten daran (z.B. Schleifarbeiten) gut zugänglich.The double-acting hydraulic cylinder according to the invention also makes work on the open tool particularly easier.
The ram is moved to the top dead center with the help of the eccentric drive and then the lift stroke is activated via the double-acting hydraulic cylinder. The lift lift, for example, has an opening path of 140 mm. With a press stroke of 160 mm, a maximum opening path of 300 mm can be achieved. This means that the pressing tool is easily accessible for visual checks or for work on it (e.g. grinding work).
Häufig sind Pressen auch mit einer Überlastsicherung ausgestattet, die meist im Stößel angeordnet ist. Der doppeltwirkende Hydraulikzylinder kann hierbei dazu verwendet werden, den Überlastweg zu vergrößern. Somit wird auch ein effizienterer Werkzeugschutz garantiert. Der Hydraulikzylinder kann aber auch die Funktion einerOften presses are also equipped with an overload protection device, which is usually located in the ram. The double-acting hydraulic cylinder can be used to increase the overload travel. This also guarantees more efficient tool protection. The hydraulic cylinder can also have the function of a
Überlastsicherung übernehmen. Im Störfall, d.h. bei einer Überlast am Stößel, wird dann das Öl im Hydraulikzylinder abgelassen, sodass der Kolbenweg im Hydraulikzylinder als Puffer dient. Der Störfall kann entweder mechanisch über Differenzkolben oder über Presskraftsensoren ermittelt werden.Take over overload protection. In the event of a malfunction, i.e. if the ram is overloaded, the oil in the hydraulic cylinder is drained so that the piston travel in the hydraulic cylinder serves as a buffer. The fault can either be determined mechanically using differential pistons or using press force sensors.
Der doppeltwirkende Zylinder kann zusätzlich dazu verwendet werden, bei einer notwendigen Kontrolle oder bei Arbeiten am Werkzeug einen schnellen Lifthub des Stößels zu realisieren bzw. gegebenenfalls als Überlastsicherung zu fungieren. Dadurch verliert man einerseits möglichst wenig Zeit und hat andererseits mehr Platz im Werkzeugzwischenraum als in herkömmlichen Pressen zur Verfügung.The double-acting cylinder can also be used to implement a quick lift stroke of the ram or, if necessary, to act as an overload protection device when a check is required or when work is being carried out on the tool. As a result, on the one hand, you lose as little time as possible and, on the other hand, you have more space in the tool gap than in conventional presses.
Es ist denkbar, dass die Presse so betrieben wird, dass der Arbeitshub der Presse nur durch den oder die doppeltwirkenden Zylinder ausgeführt wird, wobei der Hydraulikzylinder vibrierend betrieben wird.
Dabei befindet sich das obere Ende des Pleuels im oberen (0°Lage) oder unteren Totpunkt (180° Lage), damit keine Rotationskräfte in die Exzenterwelle eingeleitet werden. Wenn mehrere Pleuel vorhanden sind, werden alle doppeltwirkenden Zylinder in den jeweiligen Pleueln vibrierend betrieben.It is conceivable that the press is operated in such a way that the working stroke of the press is carried out only by the double-acting cylinder or cylinders, the hydraulic cylinder being operated in a vibrating manner.
The upper end of the connecting rod is in the upper (0 ° position) or lower dead center (180 ° position) so that no rotational forces are introduced into the eccentric shaft. If there are several connecting rods, all double-acting cylinders in the respective connecting rods are operated to vibrate.
Es ist auch denkbar, dass der Arbeitshub der Presse durch den Exzenterantrieb und den doppeltwirkenden Zylinder durchgeführt wird.It is also conceivable that the working stroke of the press is carried out by the eccentric drive and the double-acting cylinder.
Im Folgenden wird ein Ausführungsbeispiel der Erfindung anhand von drei Zeichnungen beschrieben. Es zeigen:
-
Fig. 1 eine schematische Ansicht der erfindungsgemäßen Presse; -
Fig. 2 eine Detailansicht des Pleuels; -
Fig. 3 ein Funktionsschema der Presse;
-
Fig. 1 a schematic view of the press according to the invention; -
Fig. 2 a detailed view of the connecting rod; -
Fig. 3 a functional scheme of the press;
In
Mit dem doppeltwirkenden Hydraulikzylinder 27 lässt sich außerdem ein schneller Lifthub des Stößels 10 realisieren. In
Der Arbeitshub kann auch nur durch den vibrierenden doppeltwirkenden Hydraulikzylinder 27 realisiert werden, wobei dem Druckraum 23 während eines Arbeitshubes in kleinen Stößen etwas mehr Hydraulikflüssigkeit zugeführt als nachfolgend abgeführt wird, sodass der vibrierenden Bewegung des Kolbens eine lineare Bewegung nach unten überlagert wird.
The working stroke can also only be realized by the vibrating double-acting
Wenn die beiden Leitungen 24 und 26 verschlossen sind, ist der Kolben 22 blockiert. Dann kann der Arbeitshub alleine über die Exzenterwelle 5 durchgeführt werden und die Pleuel 9 verhalten sich wie herkömmliche Pleuel ohne integrierten Hydraulikzylinder 27.
Für die Stößelverstellung lässt sich mit Hilfe der Kugelspindel 18 ein weiterer Hub C realisieren, dies dauert jedoch recht lange.When the two
A further stroke C can be implemented for the slide adjustment with the aid of the
In den
Claims (3)
- Method for operating a press or a punching machine (1) in which a ram (10) is driven with an oscillating movement via an eccentric shaft (5) and at least one connecting rod (9), characterised in that the ram (10) is also driven in addition by a double-acting hydraulic cylinder (17) that is disposed in the connecting rod shank (31), where a magnet switch (29) exposes a top pressure chamber (23) or a bottom annulus (28) of the hydraulic cylinder (27) alternately to hydraulic fluid so that the double-acting cylinder (27) is operated in a vibrating manner, causing the punching or forming process to be performed by the vibrating ram (10).
- Method according to claim 1, characterised in that the working stroke of the press (1) is executed by the double-acting cylinder (27) alone, where the top end (30) of the connecting rod (9) is located in the top or bottom dead centre.
- Method according to claim 1, characterised in that the working stroke of the press (1) is performed by the eccentric drive and the double-acting cylinder (27).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL18702671T PL3580054T3 (en) | 2017-02-09 | 2018-01-30 | Press having a double-acting hydraulic cylinder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT501042017 | 2017-02-09 | ||
PCT/EP2018/052295 WO2018145957A1 (en) | 2017-02-09 | 2018-01-30 | Press having a double-acting hydraulic cylinder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3580054A1 EP3580054A1 (en) | 2019-12-18 |
EP3580054B1 true EP3580054B1 (en) | 2021-04-21 |
Family
ID=61148226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18702671.1A Active EP3580054B1 (en) | 2017-02-09 | 2018-01-30 | Press having a double-acting hydraulic cylinder |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3580054B1 (en) |
ES (1) | ES2890223T3 (en) |
PL (1) | PL3580054T3 (en) |
WO (1) | WO2018145957A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3005404A (en) * | 1959-09-01 | 1961-10-24 | Tucker & Sons | Hydraulic connecting unit for punch-press rams |
US3552182A (en) * | 1968-11-20 | 1971-01-05 | Wisconsin Machine Corp | Press brake with hydraulic ram adjustment |
DE3507327A1 (en) * | 1985-03-01 | 1986-09-04 | Jörg 8607 Hollfeld Lange | Eccentric hydraulic press |
JPH03238200A (en) * | 1990-02-16 | 1991-10-23 | Ishikawajima Harima Heavy Ind Co Ltd | Pressurizing speed varying press |
DE10229276B4 (en) * | 2002-06-28 | 2005-09-08 | Schuler Pressen Gmbh & Co. Kg | Device for overload protection in a press |
DE102014201470B4 (en) * | 2013-01-29 | 2024-02-01 | Aida Engineering, Ltd. | Press and method for controlling the press ram |
-
2018
- 2018-01-30 ES ES18702671T patent/ES2890223T3/en active Active
- 2018-01-30 EP EP18702671.1A patent/EP3580054B1/en active Active
- 2018-01-30 PL PL18702671T patent/PL3580054T3/en unknown
- 2018-01-30 WO PCT/EP2018/052295 patent/WO2018145957A1/en active Search and Examination
Also Published As
Publication number | Publication date |
---|---|
ES2890223T3 (en) | 2022-01-18 |
WO2018145957A1 (en) | 2018-08-16 |
PL3580054T3 (en) | 2021-10-25 |
EP3580054A1 (en) | 2019-12-18 |
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