EP0329000A1 - Apparatus for reducing the speed of a slide of a hydraulic press by braking - Google Patents

Apparatus for reducing the speed of a slide of a hydraulic press by braking Download PDF

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Publication number
EP0329000A1
EP0329000A1 EP89102103A EP89102103A EP0329000A1 EP 0329000 A1 EP0329000 A1 EP 0329000A1 EP 89102103 A EP89102103 A EP 89102103A EP 89102103 A EP89102103 A EP 89102103A EP 0329000 A1 EP0329000 A1 EP 0329000A1
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EP
European Patent Office
Prior art keywords
counter
cylinder
shock absorber
piston
plunger
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
Application number
EP89102103A
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German (de)
French (fr)
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EP0329000B1 (en
Inventor
Richard Dipl.-Ing. Brüssel
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Umformtechnik Erfurt GmbH
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Fried Krupp AG
Umformtechnik Erfurt GmbH
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Publication of EP0329000A1 publication Critical patent/EP0329000A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0052—Details of, or accessories for, presses; Auxiliary measures in connection with pressing 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
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
    • B30B15/245—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam using auxiliary cylinder and piston means as actuating members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/047—Seal ring

Definitions

  • the invention relates to a device for braking the tappet of a hydraulic press used in particular for molding molded parts of fiber-reinforced plastics, according to the preamble of claim 1.
  • Presses have therefore been developed in which, after a rapid closing speed of the ram, so-called counter-cylinders are used to brake the ram while simultaneously setting a parallel run.
  • a problem with the molding of fiber-reinforced plastics arises in such presses in that the highly reactive resin mats to be processed allow only a very short, unpressurized idle time of the material in the heated lower part of the tool. The time from loading the material to closing the press must therefore be kept as short as possible.
  • There are therefore extremely high speeds for the quick closing of the Tool for example up to 1 m / s, have been used, which can practically no longer be increased, because such an increase would involve a disproportionately large amount of additional work.
  • the invention has for its object to provide a device of the type mentioned, which significantly reduces the time lost when connecting the plunger to the counter-cylinders.
  • the device according to the invention can be used for the various hydraulic press systems working with counter-cylinders. It not only offers the advantage of quick connection and effective braking of the ram and counter-cylinder, but also helps to reduce noise when operating these presses.
  • the counter cylinder 2 provided with a piston 1 is connected to the press table (not shown) of a hydraulic press with its lower flange-like end 3 by screwing it on via a height adjustment device.
  • a height adjustment device As a rule, four such counter-cylinders are arranged in such a way that their perpendicular axes 4 are arranged outside the tool area in a rectangle with respect to one another.
  • Aligned axially with the counter-cylinders 2 are attached to the plunger-like stops 5, which can also be actuated by one or more press cylinders of the hydraulic press and are not shown, and which are adapted to adapt to different heights, e.g. are adjustable in height by means of a threaded spindle.
  • the piston 1 On its outer end face, the piston 1 has a collar 6 into which an annular cylinder (7) screwed onto the piston 1 is fitted in a closing manner.
  • the cylinder 7 On the side facing away from the piston 1, the cylinder 7 points inwards pointing flange-like stop 8, which limits the stroke of a damping piston 9, which forms the shock absorber together with the cylinder 7, upwards. This design saves the end wall of the shock absorber cylinder in a simple manner.
  • the cylinder 7 is provided with an open top cylindrical attachment 10 of the same outside diameter, to which a collar-like sleeve 11 is fastened in the upper area, which is provided for sealing against any hydraulic fluid escaping.
  • the cylinder 7 also has three radial bores 12, which open into the region of the relatively narrow gap 13 formed between the piston 1 and the extended damping piston 9.
  • the width of the gap 13 corresponding to the stroke of the shock absorber is approximately 5 mm and, together with the damping piston diameter of approximately 80 mm, determines the shock absorber displacement.
  • the externally closed bores 12 are each connected to a line 14 pointing vertically upward, which extends beyond the upper end face of the cylinder 7.
  • the damping piston 9 also has a central, stepped bore 15, in which a cylindrical helical compression spring 16 is arranged, which is supported against the lower stop surface thus formed, the other end of which is supported against a coaxial blind bore 17 in the end face of the piston 1.
  • the piston 1 of the counter-holding cylinder 2 and the damping piston 9 are each shown in the upper end position, that is to say in the extended state. In this position, the stop 5 with its lower cylindrical part 18 strikes the damping piston 9 at the end of the rapid closing movement of the ram of the hydraulic press. Since the counter cylinder 2 is set so that its force is greater than the damping force of the shock absorber formed by the cylinder 7 and the damping piston 9, the hydraulic fluid in the gap 13 is through the bores 12 and the lines 14 into the cup-like interior of the attachment 10th displaced until the damping piston on the piston 1 comes to a stop and the shock absorber is thus switched off, ie has become ineffective and the counter-cylinder starts its activity.
  • the counter-holding cylinder need not be set to maximum counter-holding force when the stop 5 strikes.
  • the counter-holding force of the counter-holding cylinder can also be produced by frictional engagement with a corresponding device, which can be removed after the shock absorber has been switched off. The removal of such an additional device can be effected by a corresponding limit switch.
  • the force of the shock absorber can be changed in a simple manner to adapt to different operating conditions by screwing interchangeable nozzles 19 with different opening diameters into the bores 12, so that the throttling effect can be adjusted accordingly.
  • the throttle effect can also be adjusted by changing the shock absorber displacement. This can be achieved in a simple manner in that the flange-like stop 8 is designed as an adjusting ring provided with an external thread, which has an internal thread Cylinder 7 cooperates and can be determined in certain positions.
  • the ram of the press moves quickly back to the upper end position and takes the stop 5 with it.
  • the damping piston 9 is pressed back into its upper end position by the spring 16 and the oil displaced from the gap 13 can flow back into the gap 13 through the bore 15 released by the stop 5.
  • the lower part 18 of the stop 5 has approximately the same diameter as the projecting end of the damping piston 9 and forms at its upper end with the stop 5 a collar 20 against which the sleeve 11 bears when the stop hits the damping piston 9 .
  • an expansion bellows 21 which surrounds the shock absorber is provided for sealing the device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Control Of Presses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

A device for braking the slide of a press, which is used in particular for the compression moulding of fibre-reinforced plastics and whose slide is acted upon by at least two hydraulic counter- holding cylinders (2) which are preferably actuated in parallel, can be used to achieve a time reduction in the closing stroke of the press if there is connected between the slide and each counter-holding cylinder (2) a resettable hydraulic shock-absorbing unit (cylinder 7 and damping plunger 9) which is active over a defined stroke by throttling and whose damping force is set smaller than the force of the counter-holding cylinder (2). <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung zum Abbremsen des Stößels einer insbesondere für das Formteilverpressen von faserverstärkten Kunststoffen eingesetzten hydraulischen Presse, nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for braking the tappet of a hydraulic press used in particular for molding molded parts of fiber-reinforced plastics, according to the preamble of claim 1.

Bei hydraulischen Pressen, die für die Verarbeitung von faserverstärkten Kunststoffen eingesetzt werden, ist ein genauer Parallellauf der beiden Werkzeughälften während des Preßvorgangs erforderlich. Ein solcher genauer Parallellauf ist durch die bekannten mechanischen Führungen nicht erzielbar.For hydraulic presses that are used to process fiber-reinforced plastics, a precise parallel run of the two tool halves is required during the pressing process. Such a precise parallel run cannot be achieved with the known mechanical guides.

Es sind deshalb Pressen entwickelt worden, bei denen nach einer schnellen Schließgeschwindigkeit des Stößels durch sogenannte Gegenhaltezylinder ein Abbremsen des Stößels bei gleichzeitiger Einstellung eines Parallellaufs erzielt werden. Ein Problem beim Formteilverpressen von faserverstärkten Kunststoffen tritt bei solchen Pressen dadurch auf, daß die zur Verarbeitung kommenden hochreaktiven Harzmatten nur eine sehr kurze drucklose Liegezeit des Materials in dem beheizten Werkzeugunterteil zulassen. Die Zeit vom Einlegen des Materials bis zum Schließen der Presse muß deshalb so kurz wie möglich gehalten werden. Es sind daher bereits extrem hohe Geschwindigkeiten für das schnelle Schließen des Werkzeugs, z.B. bis zu 1 m/s, eingesetzt worden, die praktisch nicht mehr zu steigern sind, weil eine solche Steigerung mit einem unverhältnismäßig großen Mehraufwand verbunden wäre. Danach muß jedoch vor der Verbindung des durch mindestens einen Preßzylinder betätigten Stößels mit den Gegenhaltezylindern die Geschwindigkeit des Stößels auf nahezu 0 verringert werden, um diese kraft- und/oder formschlüssige Verbindung zu ermöglichen. Dadurch kann aber so viel Zeit verlorengehen, daß die Vorteile des schnellen Schließens wieder beseitigt werden.Presses have therefore been developed in which, after a rapid closing speed of the ram, so-called counter-cylinders are used to brake the ram while simultaneously setting a parallel run. A problem with the molding of fiber-reinforced plastics arises in such presses in that the highly reactive resin mats to be processed allow only a very short, unpressurized idle time of the material in the heated lower part of the tool. The time from loading the material to closing the press must therefore be kept as short as possible. There are therefore extremely high speeds for the quick closing of the Tool, for example up to 1 m / s, have been used, which can practically no longer be increased, because such an increase would involve a disproportionately large amount of additional work. Thereafter, however, the speed of the tappet must be reduced to almost 0 before connecting the tappet actuated by at least one press cylinder to the counter-cylinders in order to enable this non-positive and / or positive connection. However, this can result in the loss of so much time that the advantages of fast closing are eliminated.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung der eingangs genannten Art zu schaffen, die den Zeitverlust beim Verbinden des Stößels mit den Gegenhaltezylindern erheblich verringert.The invention has for its object to provide a device of the type mentioned, which significantly reduces the time lost when connecting the plunger to the counter-cylinders.

Die Lösung dieser Aufgabe besteht in den Merkmalen des kennzeichnenden Teils des Anspruchs 1.The solution to this problem consists in the features of the characterizing part of claim 1.

Die Einrichtung nach der Erfindung kann für die verschiedenen, mit Gegenhaltezylinder arbeitenden hydraulischen Pressensysteme eingesetzt werden. Sie bringt dabei nicht nur den Vorteil eines schnellen Verbindens und wirksamen Abbremsens von Stößel und Gegenhaltezylindern, sondern trägt auch zur Lärmminderung beim Betrieb dieser Pressen bei.The device according to the invention can be used for the various hydraulic press systems working with counter-cylinders. It not only offers the advantage of quick connection and effective braking of the ram and counter-cylinder, but also helps to reduce noise when operating these presses.

Ferner werden Erschütterungen beim Auftreffen des Stößels erheblich gemindert. Vor allem braucht jedoch die Geschwindigkeit vor dem Auftreffen des Stößels wesentlich weniger verringert zu werden und ist auch nach dem Dämpfungshub noch groß genug, um Zeitverluste für die anschließend erforderliche Beschleunigung des Stößels klein zu halten.Furthermore, vibrations when the ram strikes are considerably reduced. Above all, however, the speed before the tappet strikes needs to be reduced significantly less and is still high enough even after the damping stroke in order to keep time losses for the subsequently required tappet acceleration small.

Bei Pressen, bei denen die Gegenhaltezylinder gleichzeitig dem Öffnen des Werkzeugs nach dem Preßvorgang dienen, wird diese Funktion durch die erfindungsgemäße Einrichtung in keiner Weise beeinträchtigt.In presses in which the counter-cylinders simultaneously serve to open the tool after the pressing process, this function is in no way impaired by the device according to the invention.

Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Ansprüche 2 bis 10.Advantageous embodiments of the invention are the subject of claims 2 to 10.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung im Schnitt schematisch dargestellt und nachfolgend näher erläutert.In the drawing, an embodiment of the invention is shown schematically in section and explained in more detail below.

Der mit einem Kolben 1 versehene Gegenhaltezylinder 2 ist mit dem nicht dargestellten Pressentisch einer hydraulischen Presse mit seinem unteren flanschartig ausgebildeten Ende 3 durch Anschrauben über eine Höhenverstelleinrichtung verbunden. In der Regel sind vier solcher Gegenhaltezylinder so angeordnet, daß ihre senkrecht verlaufenden Achsen 4 außerhalb des Werkzeugsbereichs im Rechteck zueinander angeordnet sind.The counter cylinder 2 provided with a piston 1 is connected to the press table (not shown) of a hydraulic press with its lower flange-like end 3 by screwing it on via a height adjustment device. As a rule, four such counter-cylinders are arranged in such a way that their perpendicular axes 4 are arranged outside the tool area in a rectangle with respect to one another.

Achsgleich zu den Gegenhaltezylindern 2 sind am ebenfalls nicht dargestellten durch einen oder mehrere Preßzylinder betätigbaren Stößel der hydraulischen Presse nach unten vorspringende, zapfenartige Anschläge 5 befestigt, die zur Anpassung an verschiedene Höhenlagen, z.B. durch eine Gewindespindel, höhenverstellbar sind.Aligned axially with the counter-cylinders 2 are attached to the plunger-like stops 5, which can also be actuated by one or more press cylinders of the hydraulic press and are not shown, and which are adapted to adapt to different heights, e.g. are adjustable in height by means of a threaded spindle.

An seiner äußeren Stirnseite weist der Kolben 1 einen Bund 6 auf, in den ein am Kolben 1 angeschraubter ringförmiger Zylinder (7) schließend eingepaßt ist. An der vom Kolben 1 abgewandten Seite weist der Zylinder 7 einen nach innen weisenden flanschartigen Anschlag 8 auf, der den Hub eines Dämpfungskolbens 9, der zusammen mit dem Zylinder 7 den Stoßdämpfer bildet, nach oben hin begrenzt. Durch diese Ausbildung wird auf einfache Weise die Stirnwand des Stoßdämpfer-Zylinders eingespart.On its outer end face, the piston 1 has a collar 6 into which an annular cylinder (7) screwed onto the piston 1 is fitted in a closing manner. On the side facing away from the piston 1, the cylinder 7 points inwards pointing flange-like stop 8, which limits the stroke of a damping piston 9, which forms the shock absorber together with the cylinder 7, upwards. This design saves the end wall of the shock absorber cylinder in a simple manner.

Der Zylinder 7 ist mit einem oben offenen zylindrischen Aufsatz 10 gleichen Außendurchmessers versehen, an dem im oberen Bereich eine kragenartige Manschette 11 befestigt ist, die zur Abdichtung gegen etwa austretende Hydraulikflüssigkeit vorgesehen ist. Der Zylinder 7 weist ferner drei radiale Bohrungen 12 auf, die im Bereich des sich zwischen dem Kolben 1 und dem ausgefahrenen Dämpfungskolben 9 gebildeten relativ schmalen Spalts 13 in diesen einmünden. Die dem Hub des Stoßdämpfers entsprechende Weite des Spalts 13 beträgt etwa 5 mm und bestimmt zusammen mit dem Dämpfungskolben-Durchmesser von etwa 80 mm den Stoßdämpfer-Hubraum.The cylinder 7 is provided with an open top cylindrical attachment 10 of the same outside diameter, to which a collar-like sleeve 11 is fastened in the upper area, which is provided for sealing against any hydraulic fluid escaping. The cylinder 7 also has three radial bores 12, which open into the region of the relatively narrow gap 13 formed between the piston 1 and the extended damping piston 9. The width of the gap 13 corresponding to the stroke of the shock absorber is approximately 5 mm and, together with the damping piston diameter of approximately 80 mm, determines the shock absorber displacement.

Die außen verschlossenen Bohrungen 12 sind jeweils mit einer senkrecht nach oben weisenden Leitung 14 verbunden, die über die obere Stirnseite des Zylinders 7 hinausreicht. Der Dämpfungskolben 9 weist ferner eine zentrale, abgesetzte Bohrung 15 auf, in der eine gegen die so gebildete untere Anschlagfläche abgestützte zylindrische Schraubendruckfeder 16 angeordnet ist, deren anderes Ende sich gegen eine koaxiale Sackbohrung 17 in der Stirnfläche des Kolbens 1 abstützt.The externally closed bores 12 are each connected to a line 14 pointing vertically upward, which extends beyond the upper end face of the cylinder 7. The damping piston 9 also has a central, stepped bore 15, in which a cylindrical helical compression spring 16 is arranged, which is supported against the lower stop surface thus formed, the other end of which is supported against a coaxial blind bore 17 in the end face of the piston 1.

Der Kolben 1 des Gegenhaltezylinders 2 und der Dämpfungskolben 9 sind jeweils in der oberen Endlage, also in ausgefahrenem Zustand dargestellt. In dieser Stellung trifft am Ende der schnellen Schließbewegung des Stößels der hydraulischen Presse der Anschlag 5 mit seinem unteren zylindrischen Teil 18 auf den Dämpfungskolben 9 auf. Da der Gegenhaltezylinder 2 so eingestellt ist, daß seine Kraft größer ist als die Dämpfungskraft des durch den Zylinder 7 und den Dämpfungskolben 9 gebildeten Stoßdämpfers, wird die im Spalt 13 befindliche Hydraulikflüssigkeit durch die Bohrungen 12 und die Leitungen 14 in das tassenartige Innere des Aufsatzes 10 so lange verdrängt, bis der Dämpfungskolben auf dem Kolben 1 zum Anschlag kommt und der Stoßdämpfer damit ausgeschaltet, also unwirksam geworden ist und der Gegenhaltezylinder seine Tätigkeit aufnimmt.The piston 1 of the counter-holding cylinder 2 and the damping piston 9 are each shown in the upper end position, that is to say in the extended state. In this position, the stop 5 with its lower cylindrical part 18 strikes the damping piston 9 at the end of the rapid closing movement of the ram of the hydraulic press. Since the counter cylinder 2 is set so that its force is greater than the damping force of the shock absorber formed by the cylinder 7 and the damping piston 9, the hydraulic fluid in the gap 13 is through the bores 12 and the lines 14 into the cup-like interior of the attachment 10th displaced until the damping piston on the piston 1 comes to a stop and the shock absorber is thus switched off, ie has become ineffective and the counter-cylinder starts its activity.

Der Gegenhaltezylinder braucht beim Auftreffen des Anschlags 5 nicht auf maximale Gegenhaltekraft eingestellt zu sein. Die Gegenhaltekraft des Gegenhaltezylinders kann auch durch Kraftschluß mit einer entsprechenden Einrichtung hergestellt werden, die nach der Ausschaltung des Stoßdämpfers entfernt werden kann. Das Entfernen einer derartigen Zusatzeinrichtung kann durch einen entsprechenden Endschalter bewirkt werden. Die Kraft des Stoßdämpfers kann zur Anpassung an verschiedene Betriebsbedingungen auf einfache Weise dadurch verändert werden, daß in die Bohrungen 12 austauschbare Düsen 19 mit verschiedenen Öffnungsdurchmessern eingeschraubt werden, so daß die Drosselwirkung entsprechend einstellbar ist. Die Einstellung der Drosselwirkung kann auch durch Änderung des Stoßdämfer-Hubraums bewirkt werden. Das kann auf einfache Weise dadurch erzielt werden, daß der flanschartige Anschlag 8 als mit Außengewinde versehener Stellring ausgebildet ist, der mit einem Innengewinde des Zylinders 7 zusammenwirkt und in bestimmten Lagen feststellbar ist.The counter-holding cylinder need not be set to maximum counter-holding force when the stop 5 strikes. The counter-holding force of the counter-holding cylinder can also be produced by frictional engagement with a corresponding device, which can be removed after the shock absorber has been switched off. The removal of such an additional device can be effected by a corresponding limit switch. The force of the shock absorber can be changed in a simple manner to adapt to different operating conditions by screwing interchangeable nozzles 19 with different opening diameters into the bores 12, so that the throttling effect can be adjusted accordingly. The throttle effect can also be adjusted by changing the shock absorber displacement. This can be achieved in a simple manner in that the flange-like stop 8 is designed as an adjusting ring provided with an external thread, which has an internal thread Cylinder 7 cooperates and can be determined in certain positions.

Nachdem der Preßhub beendet ist, fährt der Stößel der Presse im Schnellgang wieder in die obere Endlage und nimmt dabei den Anschlag 5 mit. Dadurch wird der Dämpfungskolben 9 durch die Feder 16 wieder in seine obere Endlage gedrückt und das aus dem Spalt 13 verdrängte Öl kann durch die vom Anschlag 5 freigegebene Bohrung 15 wieder in den Spalt 13 zurückfließen. Der untere Teil 18 des Anschlags 5 weist etwa den gleichen Durchmesser wie das außen vorstehende Ende des Dämpfungskolbens 9 auf und bildet an seinem oberen Ende mit dem Anschlag 5 einen Bund 20, an den sich die Manschette 11 beim Auftreffen des Anschlags auf den Dämpfungskolben 9 anlegt. Zwischen dem Gegenhaltezylinder 2 und dem Stößel ist ein den Stoßdämpfer umschließender Dehnungsbalg 21 zur Abdichtung der Einrichtung vorgesehen.After the press stroke is finished, the ram of the press moves quickly back to the upper end position and takes the stop 5 with it. As a result, the damping piston 9 is pressed back into its upper end position by the spring 16 and the oil displaced from the gap 13 can flow back into the gap 13 through the bore 15 released by the stop 5. The lower part 18 of the stop 5 has approximately the same diameter as the projecting end of the damping piston 9 and forms at its upper end with the stop 5 a collar 20 against which the sleeve 11 bears when the stop hits the damping piston 9 . Between the counter-holding cylinder 2 and the tappet, an expansion bellows 21 which surrounds the shock absorber is provided for sealing the device.

Claims (10)

1. Einrichtung zum Abbremsen des Stößels einer insbesondere für das Formteilverpressen von faserverstärkten Kunststoffen eingesetzten hydraulischen Presse, deren Stößel durch mindestens zwei vorzugsweise parallellaufgesteuerte hydraulische Gegenhaltezylinder beaufschlagt wird, dadurch gekennzeichnet,
daß zwischen Stößel und jedem Gegenhaltezylinder ein über einen bestimmten Hub durch Drosselung wirksamer rückstellbarer hydraulischer Stoßdämpfer eingechaltet ist, dessen Dämpfungskraft kleiner als die Kraft des Gegenhaltezylinders (2) eingestellt ist.1. Device for braking the plunger of a hydraulic press used in particular for the molding of fiber-reinforced plastics, the plunger of which is acted upon by at least two preferably parallel-controlled hydraulic counter-cylinders, characterized in that
that a resettable hydraulic shock absorber effective over a certain stroke by throttling is inserted between the plunger and each counter-cylinder, the damping force of which is less than the force of the counter-cylinder (2). 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Stoßdämpfer durch mindestens ein Federelement (16) rückstellbar ist.2. Device according to claim 1, characterized in that the shock absorber can be reset by at least one spring element (16). 3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Stoßdämpfer auf den Gegenhaltezylinder (2) aufgesetzt ist.3. Device according to claim 1 or 2, characterized in that the shock absorber is placed on the counter-holding cylinder (2). 4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Stoßdämpfer auf den Kolben (1) des Gegenhaltezylinders (2) aufgesetzt ist.4. Device according to claim 3, characterized in that the shock absorber is placed on the piston (1) of the counter-holding cylinder (2). 5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Stoßdämpfer einen auf dem Kolben (1) des Gegenhaltezylinders (2) befestigten ringförmigen Zylinder (7) und einen zwischen dem Kolben und einem Anschlag (8) des Zylinders (7) bewegbaren Dämpfungskolben (9) aufweist.5. Device according to claim 4, characterized in that the shock absorber on the piston (1) of the counter-cylinder (2) attached annular cylinder (7) and one between the piston and a stop (8) of the Cylinder (7) movable damping piston (9). 6. Einrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß der Stoßdämpfer mit einem oben offenen zylindrischen Aufsatz (10) versehen ist, in den ein nach unten vorspringender, zapfenartiger Anschlag (5) des Stößels zentrisch eingreift und das tassenartige Innere des Aufsatzes (10) mit dem Hubraum des Stoßdämpfers über mindestens eine Leitung (Bohrung 12) als Drossel verbunden ist.6. Device according to one of claims 3 to 5, characterized in that the shock absorber is provided with an open top cylindrical attachment (10) into which a downwardly projecting, pin-like stop (5) of the plunger engages centrally and the cup-like interior of the Attachment (10) is connected to the displacement of the shock absorber via at least one line (bore 12) as a throttle. 7. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, daß der Aufsatz (10) mit einer kragenartigen, den zapfenartigen Anschlag umschließenden Manschette (11) versehen ist.7. Device according to claim 6, characterized in that the attachment (10) with a collar-like, the pin-like stop enclosing sleeve (11) is provided. 8. Einrichtung nach Anpsruch 5,6 oder 7, dadurch gekennzeichnet, daß der Dämpfungskolben (9) eine durchgehende zentrische Bohrung (15) aufweist.8. Device according to Anpsruch 5,6 or 7, characterized in that the damping piston (9) has a continuous central bore (15). 9. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Drosselung einstellbar ist.9. Device according to one of the preceding claims, characterized in that the throttling is adjustable. 10. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Hub der Stoßdämpfer einstellbar ist.10. Device according to one of the preceding claims, characterized in that the stroke of the shock absorber is adjustable.
EP89102103A 1988-02-18 1989-02-08 Apparatus for reducing the speed of a slide of a hydraulic press by braking Expired - Lifetime EP0329000B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3805004 1988-02-18
DE3805004A DE3805004C2 (en) 1988-02-18 1988-02-18 Device for braking the ram of a hydraulic press

Publications (2)

Publication Number Publication Date
EP0329000A1 true EP0329000A1 (en) 1989-08-23
EP0329000B1 EP0329000B1 (en) 1992-10-28

Family

ID=6347624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89102103A Expired - Lifetime EP0329000B1 (en) 1988-02-18 1989-02-08 Apparatus for reducing the speed of a slide of a hydraulic press by braking

Country Status (5)

Country Link
US (1) US4921419A (en)
EP (1) EP0329000B1 (en)
JP (1) JPH01249300A (en)
DE (1) DE3805004C2 (en)
ES (1) ES2035379T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0727295A2 (en) * 1995-02-09 1996-08-21 Ewi, Inc. Method and apparatus for plastic compression molding in a mechanical stamping press

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50101856D1 (en) * 2001-08-17 2004-05-06 Ferromatik Milacron Maschb Gmb Closing unit of a three-platen injection molding machine
US7850884B2 (en) * 2009-04-01 2010-12-14 The Gillette Company Method of compacting material
US7959837B2 (en) * 2009-04-01 2011-06-14 The Gillette Company Method of compacting material
CN106825355B (en) * 2017-03-23 2019-03-19 莱芜钢铁集团有限公司 A kind of connecting structure and hydraulic press

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2324839A1 (en) * 1972-05-25 1973-12-06 Philips Nv PRESSING DEVICE
DE2500276A1 (en) * 1974-01-07 1975-07-10 Toolex Alpha Ab MOLDING PRESS FOR HOT PRESSING OF PLASTIC OBJECTS
DE2812973B1 (en) * 1978-03-23 1980-02-21 Lauffer & Butscher Maschf Device for damping the cut on a hydraulic press

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2113115A (en) * 1934-05-25 1938-04-05 Hydraulic Press Corp Hydromechanical press
US2809542A (en) * 1953-02-17 1957-10-15 Baldwin Lima Hamilton Corp Compensating system for presses
US3997286A (en) * 1976-03-15 1976-12-14 Chicago Rawhide Manufacturing Company Molding apparatus and vacuum system therefor
US4055205A (en) * 1976-07-16 1977-10-25 Blandin Wood Products Press seal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2324839A1 (en) * 1972-05-25 1973-12-06 Philips Nv PRESSING DEVICE
DE2500276A1 (en) * 1974-01-07 1975-07-10 Toolex Alpha Ab MOLDING PRESS FOR HOT PRESSING OF PLASTIC OBJECTS
DE2812973B1 (en) * 1978-03-23 1980-02-21 Lauffer & Butscher Maschf Device for damping the cut on a hydraulic press

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0727295A2 (en) * 1995-02-09 1996-08-21 Ewi, Inc. Method and apparatus for plastic compression molding in a mechanical stamping press
EP0727295A3 (en) * 1995-02-09 1997-07-09 Ewi Inc Method and apparatus for plastic compression molding in a mechanical stamping press

Also Published As

Publication number Publication date
ES2035379T3 (en) 1993-04-16
JPH01249300A (en) 1989-10-04
DE3805004A1 (en) 1989-08-31
US4921419A (en) 1990-05-01
DE3805004C2 (en) 1996-10-31
EP0329000B1 (en) 1992-10-28

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