EP1764173A2 - Powder moulding press - Google Patents

Powder moulding press Download PDF

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Publication number
EP1764173A2
EP1764173A2 EP06013880A EP06013880A EP1764173A2 EP 1764173 A2 EP1764173 A2 EP 1764173A2 EP 06013880 A EP06013880 A EP 06013880A EP 06013880 A EP06013880 A EP 06013880A EP 1764173 A2 EP1764173 A2 EP 1764173A2
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EP
European Patent Office
Prior art keywords
piston
cylinder
guide means
central axis
tool
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
EP06013880A
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German (de)
French (fr)
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EP1764173A3 (en
EP1764173B1 (en
Inventor
Walter Solty
Bernd Horn
Guido Schrömges
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SMS Group GmbH
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SMS Meer GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/04—Frames; Guides
    • B30B15/041—Guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1471—Guiding means other than in the end cap

Definitions

  • the invention relates to a device for producing a molded part from powder, in particular from metal powder, from a powdery, doughy material, from a powder containing flowable material or from pre-pressed material having a tool on which in the manufacture of the molding a pressing force is exerted by a pressing device, wherein the tool for producing a desired molding contour has at least one piston-cylinder system with a central axis, which has a piston movable hydraulically relative to a cylinder in a travel direction.
  • a generic device is from the US 5,498,147 known. There, a tool is described which has a plurality of concentric piston-cylinder units inserted into each other. To guide the entire tool in the machine, laterally arranged guide columns are provided, which pass through a cover plate of the tool.
  • Devices of this type are used to produce molded parts of metal powder by pressing and subsequent sintering.
  • stamp-like tools are used for the pressing of powdery material, which compress the powder introduced into a die by an axial pressing movement.
  • At least one press die is inserted, which penetrates into the die.
  • the die has a cavity which opens to the punch side is.
  • the die opening is closed - except for a slight play - by the stamp.
  • the stamp builds up by its penetration into the Matrizenhohlraum necessary for compression pressure.
  • a plurality of punches are used, which can move in an axial direction.
  • the punches can dive into an axially closed on one side mold or come in an axially open in both directions die from both axial directions. Occasionally, through mandrel rods are used, but primarily have no compression function, but a positive displacement function.
  • the punches can also dip laterally into the die to create undercuts or other geometric shapes. To demould the molded part, these radially dipping punch are withdrawn so far that the demolding is not hindered.
  • piston-cylinder systems For positioning of the individual stamps, these are connected to piston-cylinder systems or they are part of these systems. In this case, a number of pistons are arranged concentrically with each other. During pressing, they are moved in accordance with the contour of the molded part to be generated by a defined displacement relative to its cylinder.
  • the individual piston-like stamps are guided in their cylinders characterized in that the piston rests with its radially outwardly facing cylindrical surface in the corresponding bore of the cylinder. It has been found, especially in the production of asymmetrical moldings, that tilting moments, the axis of which are perpendicular to the central axis of the tool, can cause problems. The existing leadership of the pistons in their cylinders is then no longer sufficient for a high-quality production. In addition, there may be problems when the rotationally symmetrical pistons in the cylinders uncontrolled around the Central axis can rotate. The known structural elements are then no longer sufficient to ensure a sufficiently accurate guidance of the pistons in their cylinders.
  • the invention is therefore the object of a device of the type mentioned in such a way that the disadvantages mentioned are avoided. It should thus be ensured that even with off-center forces sufficient guidance of the piston is maintained in their cylinders and that a rotation of the piston to its cylinder about the central axis is not possible.
  • This solution to this problem by the invention is characterized by a guide means, which guides at least one of the pistons relative to one of the cylinders in the direction of travel of the piston-cylinder system, wherein the guide means extends in the travel direction along an axis which is spaced from the central axis wherein the tool is designed as a replaceable adapter in the pressing device.
  • the invention thus provides previously unknown in the prior art guide means which are at least partially at a distance from the central axis.
  • the guide means is preferably suitable for receiving a tilting moment between the cylinder and the piston, wherein the tilting moment acts perpendicular to the central axis. Especially when asymmetric moldings have to be pressed and consequently there is no necessarily a symmetrical force distribution, the guide means ensure that no relative tilting between the piston and the cylinder can occur.
  • the guide means comprises at least one rod which is fixedly arranged on the piston or on the cylinder is and which is guided in a guide (socket) in the cylinder or in the piston. It is particularly provided that a plurality of rods are arranged on the piston or on the cylinder; Advantageously, four rods are used, which are arranged on the piston or on the cylinder. These four rods can be arranged symmetrically to two mutually perpendicular planes.
  • the rod may be attached to a support member fixed to the piston or cylinder.
  • a number of piston-cylinder systems are arranged along the central axis.
  • the pistons may be arranged concentrically with each other and at least two pistons may be adjacent to one another on facing lateral surfaces.
  • the guide means can also guide a plurality of pistons and / or cylinders relative to one another.
  • the individual pistons of the tool are guided improved in an advantageous manner, which is particularly their parallelism.
  • the directional stability of the pistons is also improved.
  • the guide rods are quick and easy to assemble and disassemble, as well as the sockets on the respective piston.
  • the overall quality of the molded part is improved because the tool is provided with precisely working parts.
  • a device 1 for producing a molded part is shown, with the metal powder 12 can be pressed into a molded part.
  • the invention is not only suitable for the processing of powder. Frequently, an already preformed compact is re-pressed in a further step, especially in the final pressing at higher pressures.
  • the device 1 consists essentially of a tool 2, which can be used in a pressing device 3.
  • the pressing device 3 has a machine frame 13 with an upper cross member 14 and a lower cross member 15.
  • an upper piston 16 is arranged in a cylinder, with which a pressing force can be applied downward.
  • the lower cross member 15 carries a lower piston 17, with which a pressing force can be generated upwards.
  • the tool 2 has a die 18, which receives the powder 12.
  • a number of stamp pistons 5 arranged concentrically with one another are provided, which are arranged in respective cylinders 4 and can be moved or controlled relative to them.
  • a piston-cylinder system Depending on a piston 5 forms together with this receiving cylinder 4, a piston-cylinder system, as it is already known as such. All pistons 5 and cylinders 4 are arranged concentrically around a central axis 6 in the exemplary embodiment.
  • actuating the respective piston-cylinder systems 4, 5 By actuating the respective piston-cylinder systems 4, 5, a movement in the direction of travel V (corresponds to the present case the vertical direction) can be accomplished. Only mentioned in passing were stamp 19 and 20, which are actuated by the upper piston 16, and a filler 21 for the feed of the die 18 with powder 12th
  • a guide means 7 which prevents tilting and excludes twisting.
  • a plate-shaped support member 11 is fixed to the piston 5, to which in turn four rods 9 are fixedly arranged with a circular cross-section.
  • the rods 9 are arranged displaceably in guides 10 in the cylinder 4 in the direction of travel V.
  • the guides can be designed as tightly tolerated sliding bushes, which ensure that during the displacement of the piston 5 relative to the cylinder 4 in the direction of travel V, a high degree of parallelism of both elements 4, 5 is maintained.
  • tilting moments M which act perpendicular to the direction of travel V, should have no influence on the parallelism between piston 5 and cylinder 4.
  • the rods 9 are positioned so that their axis 8 is at a (radial) distance a from the central axis 6.

Abstract

Molding machine for metal powders, optionally mixed with pastes or liquids, or semi-finished moldings has a molding tool mounted on a piston (5) and cylinder (4) system. The piston is fitted with a guide comprising a transverse plate (11) with axial rods (9) which fit into bores (10) in the cylinder wall.

Description

Die Erfindung betrifft eine Vorrichtung zum Herstellen eines Formteils aus Pulver, insbesondere aus Metallpulver, aus einem ein Pulver enthaltenden, teigigen Material, aus einem ein Pulver enthaltenden, fließfähigen Material oder aus vorgepresstem Material, die ein Werkzeug aufweist, auf das bei der Herstellung des Formteils von einer Pressvorrichtung eine Druckkraft ausgeübt wird, wobei das Werkzeug zur Erzeugung einer gewünschten Formteilkontur mindestens ein Kolben-Zylinder-System mit einer Zentralachse aufweist, das einen hydraulisch relativ zu einem Zylinder in eine Verfahrrichtung bewegbaren Kolben hat.The invention relates to a device for producing a molded part from powder, in particular from metal powder, from a powdery, doughy material, from a powder containing flowable material or from pre-pressed material having a tool on which in the manufacture of the molding a pressing force is exerted by a pressing device, wherein the tool for producing a desired molding contour has at least one piston-cylinder system with a central axis, which has a piston movable hydraulically relative to a cylinder in a travel direction.

Eine gattungsgemäße Vorrichtung ist aus der US 5,498,147 bekannt. Dort wird ein Werkzeug beschrieben, das eine Vielzahl von ineinander eingesetzte, konzentrische Kolben-Zylinder-Einheiten aufweist. Um das gesamte Werkzeug in der Maschine zu führen, sind seitlich angeordnete Führungssäulen vorgesehen, die eine Deckplatte des Werkzeugs durchsetzen.A generic device is from the US 5,498,147 known. There, a tool is described which has a plurality of concentric piston-cylinder units inserted into each other. To guide the entire tool in the machine, laterally arranged guide columns are provided, which pass through a cover plate of the tool.

Vorrichtungen dieser Art werden eingesetzt, um Formteile aus Metallpulver durch Pressen und anschließendes Sintern herzustellen. Hierbei werden für das Pressen von pulverförmigem Werkstoff stempelartige Werkzeuge eingesetzt, die in eine Matrize eingebrachtes Pulver durch eine axiale Pressbewegung komprimieren.Devices of this type are used to produce molded parts of metal powder by pressing and subsequent sintering. Here, stamp-like tools are used for the pressing of powdery material, which compress the powder introduced into a die by an axial pressing movement.

Hierzu wird zumindest ein Pressstempel eingesetzt, der in die Matrize eindringt. In diesem Falle besitzt die Matrize einen Hohlraum, der zur Stempelseite hin geöffnet ist. Die Matrizenöffnung wird - bis auf ein geringfügiges Spiel - vom Stempel geschlossen. Der Stempel baut durch sein Eindringen in den Matrizenhohlraum den zur Verdichtung notwendigen Druck auf.For this purpose, at least one press die is inserted, which penetrates into the die. In this case, the die has a cavity which opens to the punch side is. The die opening is closed - except for a slight play - by the stamp. The stamp builds up by its penetration into the Matrizenhohlraum necessary for compression pressure.

Es kann auch vorgesehen werden, dass mehrere Stempel eingesetzt werden, die sich in eine Achsrichtung bewegen können. Die Stempel können dabei in eine axial einseitig geschlossene Matrize eintauchen oder bei einer axial in beiden Richtungen offenen Matrize aus beiden axialen Richtungen kommen. Gelegentlich werden auch durchgehende Dornstangen eingesetzt, die aber primär keine Verdichtungsfunktion, sondern eine Verdrängerfunktion haben. Die Stempel können auch seitlich in die Matrize eintauchen, um Hinterschneidungen oder sonstige geometrische Ausprägungen zu erzeugen. Zur Entformung des Formteils werden diese radial eintauchenden Stempel so weit zurückgezogen, dass die Entformung nicht behindert wird.It can also be provided that a plurality of punches are used, which can move in an axial direction. The punches can dive into an axially closed on one side mold or come in an axially open in both directions die from both axial directions. Occasionally, through mandrel rods are used, but primarily have no compression function, but a positive displacement function. The punches can also dip laterally into the die to create undercuts or other geometric shapes. To demould the molded part, these radially dipping punch are withdrawn so far that the demolding is not hindered.

Zur Positionierung der einzelnen Stempel sind diese mit Kolben-Zylinder-Systemen verbunden bzw. sie sind Teil dieser Systeme. Dabei ist eine Anzahl Kolben zueinander konzentrisch angeordnet. Beim Pressen werden sie gemäß der zu erzeugenden Kontur des Formteils um einen definierten Verschiebeweg relativ zu ihrem Zylinder bewegt.For positioning of the individual stamps, these are connected to piston-cylinder systems or they are part of these systems. In this case, a number of pistons are arranged concentrically with each other. During pressing, they are moved in accordance with the contour of the molded part to be generated by a defined displacement relative to its cylinder.

Bei den vorbekannten Lösungen werden die einzelnen kolbenartig ausgebildeten Stempel in ihren Zylindern dadurch geführt, dass der Kolben mit seiner radial nach außen weisenden zylindrischen Oberfläche in der entsprechenden Bohrung des Zylinders anliegt. Dabei hat es sich vor allem bei der Herstellung von unsymmetrischen Formteilen gezeigt, dass Kippmomente, deren Achse senkrecht zur Zentralachse des Werkzeugs stehen, Probleme verursachen können. Die vorhandene Führung der Kolben in ihren Zylindern reicht dann nicht mehr für eine qualitativ hochwertige Fertigung aus. Darüber hinaus kann es dann zu Problemen kommen, wenn die rotationssymmetrischen Kolben in den Zylindern unkontrolliert um die Zentralachse drehen können. Die bekannten konstruktiven Elemente reichen dann nicht mehr aus, um eine hinreichend genaue Führung der Kolben in ihren Zylindern sicherzustellen.In the previously known solutions, the individual piston-like stamps are guided in their cylinders characterized in that the piston rests with its radially outwardly facing cylindrical surface in the corresponding bore of the cylinder. It has been found, especially in the production of asymmetrical moldings, that tilting moments, the axis of which are perpendicular to the central axis of the tool, can cause problems. The existing leadership of the pistons in their cylinders is then no longer sufficient for a high-quality production. In addition, there may be problems when the rotationally symmetrical pistons in the cylinders uncontrolled around the Central axis can rotate. The known structural elements are then no longer sufficient to ensure a sufficiently accurate guidance of the pistons in their cylinders.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art so fortzubilden, dass die genannten Nachteile vermieden werden. Es soll also sichergestellt werden, dass auch bei außermittigen Kräften eine hinreichende Führung der Kolben in ihren Zylindern erhalten bleibt und dass ein Verdrehen des Kolbens zu seinem Zylinder um die Zentralachse nicht möglich ist.The invention is therefore the object of a device of the type mentioned in such a way that the disadvantages mentioned are avoided. It should thus be ensured that even with off-center forces sufficient guidance of the piston is maintained in their cylinders and that a rotation of the piston to its cylinder about the central axis is not possible.

Diese Lösung dieser Aufgabe durch die Erfindung ist gekennzeichnet durch ein Führungsmittel, das zumindest einen der Kolben relativ zu einem der Zylinder in Verfahrrichtung des Kolben-Zylinder-Systems führt, wobei sich das Führungsmittel in Verfahrrichtung entlang einer Achse erstreckt, die von der Zentralachse beabstandet ist, wobei das Werkzeug als auswechselbarer Adapter in der Pressvorrichtung ausgebildet ist.This solution to this problem by the invention is characterized by a guide means, which guides at least one of the pistons relative to one of the cylinders in the direction of travel of the piston-cylinder system, wherein the guide means extends in the travel direction along an axis which is spaced from the central axis wherein the tool is designed as a replaceable adapter in the pressing device.

Die Erfindung sieht also bisher im Stand der Technik nicht bekannte Führungsmittel vor, die sich zumindest teilweise im Abstand von der Zentralachse befinden.The invention thus provides previously unknown in the prior art guide means which are at least partially at a distance from the central axis.

Das Führungsmittel ist dabei bevorzugt zur Aufnahme eines Kippmoments zwischen dem Zylinder und dem Kolben geeignet ist, wobei das Kippmoment senkrecht zur Zentralachse wirkt. Gerade, wenn unsymmetrische Formteile gepresst werden müssen und sich folglich nicht notwendiger Weise eine symmetrische Kraftverteilung ergibt, stellen die Führungsmittel sicher, dass kein relatives Verkippen zwischen Kolben und Zylinder auftreten kann.The guide means is preferably suitable for receiving a tilting moment between the cylinder and the piston, wherein the tilting moment acts perpendicular to the central axis. Especially when asymmetric moldings have to be pressed and consequently there is no necessarily a symmetrical force distribution, the guide means ensure that no relative tilting between the piston and the cylinder can occur.

Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass das Führungsmittel mindestens eine Stange aufweist, die am Kolben oder am Zylinder fest angeordnet ist und die in einer Führung (Buchse) im Zylinder oder im Kolben geführt ist. Dabei ist insbesondere vorgesehen, dass mehrere Stangen am Kolben oder am Zylinder angeordnet sind; dabei kommen mit Vorteil vier Stangen zum Einsatz, die am Kolben oder am Zylinder angeordnet sind. Diese vier Stangen können symmetrisch zu zwei aufeinander senkrecht stehenden Ebenen angeordnet sein.A preferred embodiment of the invention provides that the guide means comprises at least one rod which is fixedly arranged on the piston or on the cylinder is and which is guided in a guide (socket) in the cylinder or in the piston. It is particularly provided that a plurality of rods are arranged on the piston or on the cylinder; Advantageously, four rods are used, which are arranged on the piston or on the cylinder. These four rods can be arranged symmetrically to two mutually perpendicular planes.

Die Stange kann an einem Trägerelement befestigt sein, die am Kolben oder am Zylinder festgelegt ist.The rod may be attached to a support member fixed to the piston or cylinder.

Vorzugsweise ist eine Anzahl Kolben-Zylinder-Systeme entlang der Zentralachse angeordnet. Die Kolben können dabei konzentrisch zueinander angeordnet sein und mindestens zwei Kolben können an zugewandten Mantelflächen aneinander liegen. Dabei kann das Führungsmittel grundsätzlich auch mehrere Kolben und/oder Zylinder relativ zueinander führen.Preferably, a number of piston-cylinder systems are arranged along the central axis. The pistons may be arranged concentrically with each other and at least two pistons may be adjacent to one another on facing lateral surfaces. In principle, the guide means can also guide a plurality of pistons and / or cylinders relative to one another.

Mit der erfindungsgemäßen Ausführung wird erreicht, dass ein Verdrehen des Kolbens relativ zu seinem Zylinder nicht möglich ist, was vor allem beim Pressen unsymmetrischer Formteile wichtig ist.With the embodiment according to the invention it is achieved that a rotation of the piston relative to its cylinder is not possible, which is important especially when pressing asymmetrical molded parts.

Weiterhin wird eine verbesserte Führung zwischen Kolben und Zylindern erreicht, insbesondere im Falle dessen, dass Kippmomente zwischen diesen Bauteilen wirken, wobei die Momentenachse senkrecht auf der Zentralachse der Kolben-Zylinder-Einheiten steht.Furthermore, an improved guidance between piston and cylinders is achieved, in particular in the event that tilting moments act between these components, wherein the torque axis is perpendicular to the central axis of the piston-cylinder units.

Die einzelnen Kolben des Werkzeugs sind in vorteilhafter Weise verbessert geführt, was insbesondere ihre Parallelität anbelangt. Auch der Geradeauslauf der Kolben ist verbessert.The individual pistons of the tool are guided improved in an advantageous manner, which is particularly their parallelism. The directional stability of the pistons is also improved.

Schließlich ist es von Vorteil, dass die Führungsstellen, da nunmehr von der Zentralachse "nach außen" verlagert, leichter zugänglich sind.Finally, it is advantageous that the guide points, since now shifted from the central axis "out", are more accessible.

Vorteilhaft ist es ferner, dass kürzere Montagezeiten möglich sind, da aufwändige Demontagen der einzelnen Kolben zum Zwecke der Verbesserung des Führungsspiels entfallen können. Die Führungsstangen sind schnell und einfach zu montieren bzw. zu demontieren, ebenso die Buchsen an den jeweiligen Kolben.It is also advantageous that shorter assembly times are possible because complex dismantling of the individual pistons can be omitted for the purpose of improving the management game. The guide rods are quick and easy to assemble and disassemble, as well as the sockets on the respective piston.

Dadurch wird insgesamt die Qualität des Formteils verbessert, da das Werkzeug mit präzise zueinander arbeitenden Teilen versehen ist.As a result, the overall quality of the molded part is improved because the tool is provided with precisely working parts.

Weitere Merkmale und Einzelheiten der Erfindung ergeben sich aus den Ansprüchen und der Beschreibung eines in den Zeichnungen dargestellten Ausführungsbeispiels der Erfindung. Es zeigen:

Fig. 1
eine Vorrichtung zum Herstellen eines Formteils aus Pulver,
Fig. 2
einen Ausschnitt aus dem Werkzeug der Vorrichtung mit einem Kolben-Zylinder-System und einem erfindungsgemäßen Führungsmittel,
Fig. 3a
die Draufsicht auf einen Zylinder eines ersten Kolben-Zylinder-Systems der Vorrichtung,
Fig. 3b
die Draufsicht auf einen Kolben eines ersten Kolben-Zylinder-Systems der Vorrichtung,
Fig. 3c
die Draufsicht auf ein Trägerelement der Führungsmittel eines ersten Kolben-Zylinder-Systems,
Fig. 4a
die Draufsicht auf ein Trägerelement der Führungsmittel eines zweiten Kolben-Zylinder-Systems,
Fig. 4b
die Draufsicht auf einen Kolben eines zweiten Kolben-Zylinder-Systems der Vorrichtung und
Fig. 4c
die Draufsicht auf ein Trägerelement der Führungsmittel eines zweiten Kolben-Zylinder-Systems.
Further features and details of the invention will become apparent from the claims and the description of an embodiment of the invention shown in the drawings. Show it:
Fig. 1
an apparatus for producing a molded part from powder,
Fig. 2
a detail of the tool of the device with a piston-cylinder system and a guide means according to the invention,
Fig. 3a
the top view of a cylinder of a first piston-cylinder system of the device,
Fig. 3b
the top view of a piston of a first piston-cylinder system of the device,
Fig. 3c
the top view of a carrier element of the guide means of a first piston-cylinder system,
Fig. 4a
the top view of a carrier element of the guide means of a second piston-cylinder system,
Fig. 4b
the top view of a piston of a second piston-cylinder system of the device and
Fig. 4c
the top view of a carrier element of the guide means of a second piston-cylinder system.

In Fig. 1 ist eine Vorrichtung 1 zum Herstellen eines Formteils dargestellt, mit der Metallpulver 12 zu einem Formteil gepresst werden kann. Es sei angemerkt, dass die Erfindung nicht nur für die Verarbeitung von Pulver tauglich ist. Häufig wird ein bereits vorgeformter Pressling in einem weiteren Schritt nachgepresst, insbesondere beim abschließenden Pressen mit höheren Drücken.In Fig. 1, a device 1 for producing a molded part is shown, with the metal powder 12 can be pressed into a molded part. It should be noted that the invention is not only suitable for the processing of powder. Frequently, an already preformed compact is re-pressed in a further step, especially in the final pressing at higher pressures.

Die Vorrichtung 1 besteht im wesentlichen aus einem Werkzeug 2, das in eine Pressvorrichtung 3 eingesetzt werden kann. Die Pressvorrichtung 3 hat einen Maschinenrahmen 13 mit einer oberen Traverse 14 und einer unteren Traverse 15. An der oberen Traverse 14 ist ein Oberkolben 16 in einem Zylinder angeordnet, mit dem eine Presskraft nach unten ausgeübt werden kann. Die untere Traverse 15 trägt einen Unterkolben 17, mit dem eine Presskraft nach oben erzeugt werden kann.The device 1 consists essentially of a tool 2, which can be used in a pressing device 3. The pressing device 3 has a machine frame 13 with an upper cross member 14 and a lower cross member 15. At the upper cross member 14, an upper piston 16 is arranged in a cylinder, with which a pressing force can be applied downward. The lower cross member 15 carries a lower piston 17, with which a pressing force can be generated upwards.

Das Werkzeug 2 weist eine Matrize 18 auf, die das Pulver 12 aufnimmt. Um eine gewünschte Formteilkontur herzustellen, ist eine Anzahl konzentrisch zueinander angeordnete stempelartige Kolben 5 vorgesehen, die in jeweiligen Zylindern 4 angeordnet sind und relativ zu diesen gesteuert bzw. geregelt verfahren werden können. Je ein Kolben 5 bildet zusammen mit dem diesen aufnehmenden Zylinder 4 ein Kolben-Zylinder-System, wie es als solches vorbekannt ist. Alle Kolben 5 bzw. Zylinder 4 sind im Ausführungsbeispiel um eine Zentralachse 6 herum konzentrisch angeordnet. Durch Betätigung der jeweiligen Kolben-Zylinder-Systeme 4, 5 kann eine Verfahrbewegung in Verfahrrichtung V (entspricht vorliegend der vertikalen Richtung) bewerkstelligt werden. Nur am Rande erwähnt seien Stempel 19 und 20, die durch den Oberkolben 16 betätigt werden, sowie ein Füller 21 für die Beschickung der Matrize 18 mit Pulver 12.The tool 2 has a die 18, which receives the powder 12. In order to produce a desired molding contour, a number of stamp pistons 5 arranged concentrically with one another are provided, which are arranged in respective cylinders 4 and can be moved or controlled relative to them. Depending on a piston 5 forms together with this receiving cylinder 4, a piston-cylinder system, as it is already known as such. All pistons 5 and cylinders 4 are arranged concentrically around a central axis 6 in the exemplary embodiment. By actuating the respective piston-cylinder systems 4, 5, a movement in the direction of travel V (corresponds to the present case the vertical direction) can be accomplished. Only mentioned in passing were stamp 19 and 20, which are actuated by the upper piston 16, and a filler 21 for the feed of the die 18 with powder 12th

Um eine kippfreie Führung des Kolbens 5 relativ zum Zylinder 4 auch bei unsymmetrischen Formteilen sicherzustellen und ferner eine relative Drehung zwischen Kolben 5 und Zylinder 4 um die Zentralachse 6 zu verhindern, ist eine Ausgestaltung vorgesehen, wie sie schematisch aus Fig. 2 hervorgeht.In order to ensure a tilt-free guidance of the piston 5 relative to the cylinder 4 even with asymmetrical moldings and also to prevent a relative rotation between the piston 5 and cylinder 4 about the central axis 6, a configuration is provided, as is apparent from Fig. 2.

Zwischen Kolben 5 und Zylinder 4 ist ein Führungsmittel 7 vorgesehen, das Kippen verhindert und Verdrehen ausschließt. Hierzu ist am Kolben 5 ein plattenförmiges Trägerelement 11 befestigt, an dem wiederum vier Stangen 9 mit kreisförmigem Querschnitt fest angeordnet sind. Die Stangen 9 sind in Führungen 10 im Zylinder 4 in Verfahrrichtung V verschieblich angeordnet. Die Führungen können als eng tolerierte Gleitbuchsen ausgebildet sein, die sicherstellen, dass bei der Verschiebung des Kolbens 5 relativ zum Zylinder 4 in Verfahrrichtung V ein hoher Grad an Parallelität beider Elemente 4, 5 aufrechterhalten wird. Namentlich sollen Kippmomente M, die senkrecht zur Verfahrrichtung V wirken, keinen Einfluss auf die Parallelität zwischen Kolben 5 und Zylinder 4 haben.Between piston 5 and cylinder 4, a guide means 7 is provided which prevents tilting and excludes twisting. For this purpose, a plate-shaped support member 11 is fixed to the piston 5, to which in turn four rods 9 are fixedly arranged with a circular cross-section. The rods 9 are arranged displaceably in guides 10 in the cylinder 4 in the direction of travel V. The guides can be designed as tightly tolerated sliding bushes, which ensure that during the displacement of the piston 5 relative to the cylinder 4 in the direction of travel V, a high degree of parallelism of both elements 4, 5 is maintained. In particular, tilting moments M, which act perpendicular to the direction of travel V, should have no influence on the parallelism between piston 5 and cylinder 4.

Die Stangen 9 sind so positioniert, dass ihre Achse 8 in einem (radialen) Abstand a von der Zentralachse 6 liegt.The rods 9 are positioned so that their axis 8 is at a (radial) distance a from the central axis 6.

Wie in den Figuren 3 bzw. 4 für zwei Kolben-Zylinder-Systeme 4, 5 des Werkzeugs 2 gesehen werden kann, sind vorliegend vier Stangen 9 angeordnet, die zu zwei aufeinander senkrecht stehenden Symmetrieebenen spiegelbildlich positioniert sind. Die Stangen 9 werden von den jeweiligen Trägerelementen 11 gehalten, die an den Kolben 5 festgelegt sind. Zu dem in Fig. 4a skizzierten Trägerelement 11 ist auch der Schnitt in der Seitenansicht skizziert, um die Ausgestaltung des Elements zu illustrieren.As can be seen in Figures 3 and 4 for two piston-cylinder systems 4, 5 of the tool 2, four rods 9 are arranged in the present case, which are positioned mirror-symmetrically to two mutually perpendicular planes of symmetry. The rods 9 are held by the respective carrier elements 11, which are fixed to the piston 5. For the support element 11 sketched in FIG. 4a, the section in the side view is also sketched in order to illustrate the design of the element.

Das Einfügen der Hauptführungsstangen in den Adapter (Werkzeug) ermöglicht es also, außermittige Kräfte besser als bisher aufzunehmen, da die Führungsstangen aufgrund ihrer Steifigkeit und ihrer Positionierung im Adapter (Werkzeug) Drehmomente und Seitenkräfte besser aufnehmen und übertragen können, als es bei der vorbekannten Lösung der Fall ist. Dort sind zumeist die Kolben mit Führungsbändern geführt, die nicht die Leistungsfähigkeit haben, wie die Ausgestaltung nach der Erfindung.The insertion of the main guide rods in the adapter (tool) thus makes it possible to absorb off-center forces better than before, since the guide rods due to their rigidity and their positioning in the adapter (tool) torques and lateral forces better absorb and can transfer, as in the previously known solution the case is. There, most of the pistons are guided with guide belts that do not have the performance, as the embodiment of the invention.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Vorrichtung zum Herstellen eines FormteilsDevice for producing a molded part
22
WerkzeugTool
33
Pressvorrichtungpressing device
44
Zylindercylinder
55
Kolbenpiston
4, 54, 5
Kolben-Zylinder-SystemPiston-cylinder system
66
Zentralachsecentral axis
77
Führungsmittelguide means
88th
Achse des FührungsmittelsAxis of the guide means
99
Stangepole
1010
Führungguide
1111
Trägerelementsupport element
1212
Metallpulvermetal powder
1313
Maschinenrahmenmachine frame
1414
obere Traverseupper crossbar
1515
untere Traverselower crossbar
1616
Oberkolbentop ram
1717
Unterkolbenunder pistons
1818
Matrizedie
1919
Stempelstamp
2020
Stempelstamp
2121
Füllerink pen
VV
Verfahrrichtungtraversing
aa
Abstanddistance
MM
Kippmomentoverturning moment

Claims (9)

Vorrichtung (1) zum Herstellen eines Formteils aus Pulver, insbesondere aus Metallpulver, aus einem ein Pulver enthaltenden, teigigen Material, aus einem ein Pulver enthaltenden, fließfähigen Material oder aus vorgepresstem Material, die ein Werkzeug (2) aufweist, auf das bei der Herstellung des Formteils von einer Pressvorrichtung (3) eine Druckkraft ausgeübt wird, wobei das Werkzeug (2) zur Erzeugung einer gewünschten Formteilkontur mindestens ein Kolben-Zylinder-System (4, 5) mit einer Zentralachse (6) aufweist, das einen hydraulisch relativ zu einem Zylinder (4) in eine Verfahrrichtung (V) bewegbaren Kolben (5) hat,
gekennzeichnet durch
ein Führungsmittel (7), das zumindest den Kolben (5) relativ zu dem Zylinder (4) in Verfahrrichtung (V) des Kolben-Zylinder-Systems (4, 5) führt, wobei sich das Führungsmittel (7) in Verfahrrichtung (V) entlang einer Achse (8) erstreckt, die von der Zentralachse (6) beabstandet (a) ist, wobei das Werkzeug (2) als auswechselbarer Adapter in der Pressvorrichtung (3) ausgebildet ist.Device (1) for producing a molded part from powder, in particular from metal powder, from a doughy material containing a powder, from a flowable material containing a powder or from pre-pressed material, which has a tool (2) to which it is manufactured a pressure force is exerted on the molded part by a pressing device (3), wherein the tool (2) for producing a desired shaped part contour has at least one piston-cylinder system (4, 5) with a central axis (6) which is hydraulically relative to one Cylinder (4) in a direction of travel (V) has movable piston (5),
marked by
a guide means (7) which guides at least the piston (5) relative to the cylinder (4) in the travel direction (V) of the piston-cylinder system (4, 5), wherein the guide means (7) in the direction of travel (V) extends along an axis (8) which is spaced from the central axis (6) (a), wherein the tool (2) is designed as a replaceable adapter in the pressing device (3). Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
dass das Führungsmittel (7) zur Aufnahme eines Kippmoments (M) zwischen dem Zylinder (4) und dem Kolben (5) geeignet ist, wobei das Kippmoment (M) senkrecht zur Zentralachse (6) wirkt.Device according to claim 1,
characterized,
is that the guide means (7) for receiving a tilting moment (M) between the cylinder (4) and the piston (5) suitable, and the tilting moment (M) perpendicular to the central axis (6) acts. Vorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass das Führungsmittel (7) mindestens eine Stange (9) aufweist, die am Kolben (5) oder am Zylinder (4) fest angeordnet ist und die in einer Führung (10) im Zylinder (4) oder im Kolben (5) geführt ist.Apparatus according to claim 1 or 2,
characterized,
that the guide means (7) comprises at least a rod (9) on the piston (5) or the cylinder (4) is fixed and in a guide (10) in the cylinder (4) or in the piston (5) is guided , Vorrichtung nach Anspruch 3,
dadurch gekennzeichnet,
dass mehrere Stangen (9) am Kolben (5) oder am Zylinder (4) angeordnet sind.Device according to claim 3,
characterized,
in that a plurality of rods (9) are arranged on the piston (5) or on the cylinder (4). Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet,
dass vier Stangen (9) am Kolben (5) oder am Zylinder (4) angeordnet sind.Device according to claim 4,
characterized,
that four rods (9) are arranged on the piston (5) or the cylinder (4). Vorrichtung nach einem der Ansprüche 3 bis 5,
dadurch gekennzeichnet,
dass die Stange (9) an einem Trägerelement (11) befestigt ist, die am Kolben (5) oder am Zylinder (4) festgelegt ist.Device according to one of claims 3 to 5,
characterized,
in that the rod (9) is fastened to a support element (11) fixed to the piston (5) or to the cylinder (4). Vorrichtung nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
dass eine Anzahl Kolben-Zylinder-Systeme (4, 5) entlang der Zentralachse (6) angeordnet ist.Device according to one of claims 1 to 6,
characterized,
in that a number of piston-cylinder systems (4, 5) are arranged along the central axis (6). Vorrichtung nach Anspruch 7,
dadurch gekennzeichnet,
dass die Kolben (5) konzentrisch angeordnet sind und mindestens zwei Kolben (5) an zugewandten Mantelflächen aneinander liegen.Device according to claim 7,
characterized,
that the piston (5) are arranged concentrically and at least two pistons (5) are located on facing lateral surfaces to each other. Vorrichtung nach Anspruch 7 oder 8,
dadurch gekennzeichnet,
dass das Führungsmittel (7) mehrere Kolben (5) und/oder Zylinder (4) relativ zueinander führt.Device according to claim 7 or 8,
characterized,
that the guide means (7) a plurality of pistons (5) and / or cylinder (4) leads relative to each other.
EP06013880A 2005-09-20 2006-07-04 Powder moulding press Active EP1764173B1 (en)

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DE102005044759A DE102005044759B4 (en) 2005-09-20 2005-09-20 Device for producing a molded part

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EP3530448A1 (en) * 2018-02-26 2019-08-28 Osterwalder AG Pressing device for a powder press and a tool changing system
NL2028552B1 (en) * 2021-06-25 2023-01-02 Boschman Tech Bv Component Processing Apparatus and Method Allowing to Selectively Apply Force to a Component Processed

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CN107427916A (en) * 2015-02-02 2017-12-01 吉凯恩粉末冶金工程有限公司 The powder compaction press of lower punch with bevel-type, the method for running powder compaction press, the compacting product manufactured with powder compaction press, the lower punch of powder compaction press and the computer program product for moving the lower punch of press
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US11007744B2 (en) * 2015-02-02 2021-05-18 Gkn Sinter Metals Engineering Gmbh Shape-optimized PM tool components using connection technology
WO2016124511A1 (en) * 2015-02-04 2016-08-11 Gkn Sinter Metals Engineering Gmbh Powder press having a cone-shaped substructure
US11103924B2 (en) 2015-02-04 2021-08-31 Gkn Sinter Metals Engineering Gmbh Powder press having a cone-shaped substructure
WO2019162510A1 (en) * 2018-02-26 2019-08-29 Osterwalder Ag Press device for a powder press and a tool changing system
EP3530448A1 (en) * 2018-02-26 2019-08-28 Osterwalder AG Pressing device for a powder press and a tool changing system
CN111819072A (en) * 2018-02-26 2020-10-23 奥斯瓦尔德股份公司 Pressing device for powder press and tool changing system
CN108637244A (en) * 2018-04-12 2018-10-12 海宁金瑞金属制品有限公司 The molding die of powder metallurgy
NL2028552B1 (en) * 2021-06-25 2023-01-02 Boschman Tech Bv Component Processing Apparatus and Method Allowing to Selectively Apply Force to a Component Processed

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Publication number Publication date
JP2007083308A (en) 2007-04-05
US20070062248A1 (en) 2007-03-22
EP1764173A3 (en) 2008-07-02
ATE482041T1 (en) 2010-10-15
EP1764173B1 (en) 2010-09-22
DE102005044759A1 (en) 2007-04-05
DE102005044759B4 (en) 2007-07-12
DE502006007915D1 (en) 2010-11-04

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