EP1952975B1 - Powder press for manufacturing mouldings from metal powder - Google Patents

Powder press for manufacturing mouldings from metal powder Download PDF

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Publication number
EP1952975B1
EP1952975B1 EP20070101629 EP07101629A EP1952975B1 EP 1952975 B1 EP1952975 B1 EP 1952975B1 EP 20070101629 EP20070101629 EP 20070101629 EP 07101629 A EP07101629 A EP 07101629A EP 1952975 B1 EP1952975 B1 EP 1952975B1
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EP
European Patent Office
Prior art keywords
piston
die
plate
upper plate
powder
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EP20070101629
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German (de)
French (fr)
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EP1952975A1 (en
Inventor
Alex Wehrli
Bruno Stoll
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OSTERWALDER AG
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OSTERWALDER AG
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Priority to EP20070101629 priority Critical patent/EP1952975B1/en
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    • 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
    • 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
    • B30B11/027—Particular press methods or systems

Definitions

  • the present invention relates to a powder press for producing metal powder compacts
  • a powder press for producing metal powder compacts comprising a press frame having a base plate and an upper plate, a lower punch fixedly connected to the base plate, an upper punch having a hydraulic piston attached to the upper plate Cylinder unit is vertically movable, and a die, which is also movable in a vertical manner, driven by further double-acting hydraulic piston-cylinder units, on each of whose piston a piston rod is mounted on one side and the piston thus piston rod side an annular piston surface and opposite has a circular piston surface, wherein the other piston-cylinder units are arranged in the press frame, that during the pressing process, the vertical force acting from the upper punch on the die vertical force is supported on the circular piston surface, and that after the pressing process Abziehkraft to be applied to the die over the annular piston surface can be applied.
  • Such powder presses serve, for example, to produce pellets made of metal powder, which are provided with a circumferential collar.
  • the metal powder to be pressed is introduced into the matrix mold, after which the pressing process can begin.
  • FIGS. 1 to 3 This known pressing process is shown schematically in the accompanying FIGS. 1 to 3 shown.
  • the upper punch 1 has lowered so far onto the die 2 that the die 2 is closed at the top with the powder contained in the mold.
  • the shape of the die 2 is closed by a lower punch 3, which is held firmly in the press frame 4.
  • the actual pressing process begins, the upper punch 1 is further lowered and moves to the lower punch 3.
  • the die 2 is also lowered, with the distance covered by the die 2 corresponding to approximately half the distance of the upper die 1.
  • Fig. 2 the situation is shown in which the compact 5 is fully pressed.
  • the upper punch exerts a pressing force F1 for pressing.
  • This pressing force F1 counteracts on the one hand the counterforce F2, which is received by the lower punch 3, and the forces F3, which are to be absorbed by the die 2.
  • FIG. 2 After completion of the pressing process, as in Fig. 2 is shown, the upper punch 1 is slightly moved up, the compact 5 is relieved. Thereafter, the die 2 is moved further down, the compact 5 is ejected from the die mold by the lower punch 3, as shown in FIG Fig. 3 is shown.
  • the friction between the lateral surfaces of the compact 5 and the shape of the die 2 must be overcome, so when driving down the die 2 a pull-off force F4 must be applied.
  • This pull-off force F4 is in most cases substantially less than the support force F3 to be applied by the die 2 during the pressing process.
  • Fig. 4 shows schematically the construction of a known from the prior art powder press, with which the likewise known pressing operation can be carried out, as to the Fig. 1 to 3 has been described.
  • This powder press comprises a press frame 4 equipped with a base plate 6 and an upper plate 7. Supported on the base plate 6 is the lower punch 3, this is thus held in the press frame 4.
  • the upper punch 1 is vertically movable via a hydraulic piston-cylinder unit 8, which is attached to the upper plate 7.
  • the die 2 which is also movable in the vertical direction.
  • the die 2 is attached to columns 9, which are guided longitudinally displaceable in the base plate 6 and the upper plate 7.
  • a connecting plate 10 is fixed, which connects the columns 9 with each other.
  • a further, double-acting, hydraulic piston-cylinder unit 11 is arranged below the base plate 6, below the base plate 6, a further, double-acting, hydraulic piston-cylinder unit 11 is arranged.
  • the piston 12 in the cylinder 13 is displaceable and acted upon by pressure medium from both sides.
  • a piston rod 14th attached, which penetrates the cylinder 13 in a known manner and is connected to the connecting plate 10.
  • the piston 12 piston rod side an annular piston surface 15 and opposite a circular piston surface 16.
  • the circular piston surface 16 is thus larger than the annular piston surface 15, which can be applied with the same pressure of the pressure medium forces are correspondingly different.
  • the die 2 has to apply the forces F3 opposing the pressing force F1 during the pressing process.
  • the force to be absorbed by the die 2 via the columns 9, the connecting plate 10 and the annular piston surface 15 transmits to the in-cylinder 13 located pressure medium.
  • the withdrawal force F4 must be applied, which is done by acting on the circular piston surface 16 with the pressure medium.
  • the object of the present invention is therefore to design a powder press so that the control means for displacing the die can be optimally dimensioned, whereby on the one hand a less expensive construction and on the other hand a saving of energy can be achieved, and that kept low the height of this powder press can be.
  • the other piston-cylinder units are mounted on the upper plate. As a result, it can be achieved that the working height in the powder press according to the invention becomes lower, as a result of which, for example, the insertion of this powder press into a pit in the bottom can be avoided, which also leads to cost savings.
  • An advantageous embodiment of the invention is that the cylinders of the further piston-cylinder units are embedded in the upper plate. This allows the entire height of the powder press to be reduced.
  • the further plate is provided with a central opening through which the cylinder of the hydraulic piston-cylinder unit protrudes. This also reduces the overall height of the powder press.
  • the powder press according to the invention is constructed substantially the same as that to Fig. 4 described, known from the prior art powder press.
  • the same reference numerals are therefore used for the sake of simplicity.
  • powder press in turn comprises a press frame 4, which with a base plate 6 and an upper Ren plate 7 is equipped.
  • the piston-cylinder unit 8 for moving the upper punch 1 is in turn attached to the upper plate 7.
  • the lower punch 3 is held on the base plate 6 fixed in the powder press.
  • the die 2 is fixed to columns 9, which are guided displaceably guided in the base plate 6 and the upper plate 7.
  • the other double-acting hydraulic piston-cylinder units 17 are arranged in the upper plate 7 in this inventive powder press.
  • the respective cylinder chamber 18 consists of a bore which are mounted in the upper plate 7.
  • a piston 19 is used in each case, which is provided with a piston rod 20, which protrude above a further bore above the upper plate 7.
  • the cylinder chamber 18 is closed in each case via a cover plate 21 against the bottom.
  • a further plate 22 is fixed, which connect the piston rods 20.
  • the columns 9 are fixed, with which the die 2 is slidably held.
  • the further plate 22 is provided with a central opening 23 through which the cylinder 24 of the piston-cylinder unit 8 protrudes, whereby the height of the machine can be kept low.
  • the working height represented by the double arrow 27, can be kept low.
  • the working height of the known from the prior art powder press as shown in Fig. 4 shown by the double arrow 28, much higher.
  • This can be according to the invention with the powder press according to Fig. 5 It may not be necessary to place this powder press in a pit in the ground to reach a comfortable working height, which greatly simplifies the installation of this powder press.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)

Description

Die vorliegende Erfindung bezieht sich auf eine Pulverpresse zur Herstellung von Presslingen aus Metallpulver, umfassend einen Pressenrahmen mit einer Grundplatte und einer oberen Platte, einen Unterstempel, der fest mit der Grundplatte verbunden ist, einen Oberstempel, der über eine an der oberen Platte angebrachte hydraulische Kolben-Zylinder-Einheit vertikal verfahrbar ist, und eine Matrize, welche ebenfalls in vertikaler Weise verfahrbar ist, angetrieben über weitere doppelt wirkende hydraulische Kolben-Zylinder-Einheiten, an deren Kolben jeweils einseitig eine Kolbenstange angebracht ist und der Kolben somit kolbenstangenseitig eine ringförmige Kolbenfläche und gegenüberliegend eine kreisförmige Kolbenfläche aufweist, wobei die weiteren Kolben-Zylinder-Einheiten derart im Pressenrahmen angeordnet sind, dass beim Pressvorgang die vom Oberstempel auf die Matrize wirkende vertikale Kraft über die kreisförmige Kolbenfläche abstützbar ist, und dass die nach dem Pressvorgang auf die Matrize auszuübende Abziehkraft über die ringförmige Kolbenfläche aufbringbar ist.The present invention relates to a powder press for producing metal powder compacts comprising a press frame having a base plate and an upper plate, a lower punch fixedly connected to the base plate, an upper punch having a hydraulic piston attached to the upper plate Cylinder unit is vertically movable, and a die, which is also movable in a vertical manner, driven by further double-acting hydraulic piston-cylinder units, on each of whose piston a piston rod is mounted on one side and the piston thus piston rod side an annular piston surface and opposite has a circular piston surface, wherein the other piston-cylinder units are arranged in the press frame, that during the pressing process, the vertical force acting from the upper punch on the die vertical force is supported on the circular piston surface, and that after the pressing process Abziehkraft to be applied to the die over the annular piston surface can be applied.

Derartige Pulverpressen sind bekannt. Diese dienen beispielsweise dazu, Presslinge aus Metallpulver herzustellen, die mit einem umlaufenden Kragen versehen sind. In bekannter Weise wird hierbei in die Matrizenform das zu verpressende Metallpulver eingefüllt, wonach der Pressvorgang beginnen kann.Such powder presses are known. These serve, for example, to produce pellets made of metal powder, which are provided with a circumferential collar. In a known manner, the metal powder to be pressed is introduced into the matrix mold, after which the pressing process can begin.

Dieser bekannte Pressvorgang ist schematisch in den beiliegenden Figuren 1 bis 3 dargestellt. In Fig. 1 hat sich der Oberstempel 1 soweit auf die Matrize 2 abgesenkt, dass die Matrize 2 mit der in der Form enthaltenen Pulver obenseitig geschlossen ist. Untenseitig wird die Form der Matrize 2 durch einen Unterstempel 3 verschlossen, welcher fest im Pressenrahmen 4 gehalten ist. Aus dieser Ausgangssituation beginnt der eigentliche Pressvorgang, der Oberstempel 1 wird weiter abgesenkt und bewegt sich auf den Unterstempel 3 zu. Gleichzeitig wird auch die Matrize 2 abgesenkt, wobei der durch die Matrize 2 zurückgelegte Weg etwa dem halben Weg des Oberstempels 1 entspricht.This known pressing process is shown schematically in the accompanying FIGS. 1 to 3 shown. In Fig. 1 the upper punch 1 has lowered so far onto the die 2 that the die 2 is closed at the top with the powder contained in the mold. On the bottom side, the shape of the die 2 is closed by a lower punch 3, which is held firmly in the press frame 4. From this initial situation, the actual pressing process begins, the upper punch 1 is further lowered and moves to the lower punch 3. At the same time, the die 2 is also lowered, with the distance covered by the die 2 corresponding to approximately half the distance of the upper die 1.

In Fig. 2 ist die Situation dargestellt, in welcher der Pressling 5 voll gepresst wird. Der Oberstempel übt zum Pressen eine Presskraft F1 auf. Dieser Presskraft F1 wirkt einerseits die Gegenkraft F2 entgegen, die durch den Unterstempel 3 aufgenommen wird, sowie die Kräfte F3, die durch die Matrize 2 aufzunehmen sind.In Fig. 2 the situation is shown in which the compact 5 is fully pressed. The upper punch exerts a pressing force F1 for pressing. This pressing force F1 counteracts on the one hand the counterforce F2, which is received by the lower punch 3, and the forces F3, which are to be absorbed by the die 2.

Nach Beendigung des Pressvorgangs, wie er in Fig. 2 dargestellt ist, wird der Oberstempel 1 geringfügig nach oben bewegt, der Pressling 5 wird entlastet. Danach wird die Matrize 2 weiter nach unten bewegt, der Pressling 5 wird durch den Unterstempel 3 aus der Matrizenform ausgestossen, wie dies in Fig. 3 dargestellt ist. Hierzu muss die Reibung zwischen den Mantelflächen des Presslings 5 und der Form der Matrize 2 überwunden werden, somit muss beim nach unten fahren der Matrize 2 eine Abzugkraft F4 aufgebracht werden. Diese Abzugkraft F4 ist in den meisten Fällen wesentlich geringer als die durch die Matrize 2 aufzubringende Abstützkraft F3 beim Pressvorgang.After completion of the pressing process, as in Fig. 2 is shown, the upper punch 1 is slightly moved up, the compact 5 is relieved. Thereafter, the die 2 is moved further down, the compact 5 is ejected from the die mold by the lower punch 3, as shown in FIG Fig. 3 is shown. For this purpose, the friction between the lateral surfaces of the compact 5 and the shape of the die 2 must be overcome, so when driving down the die 2 a pull-off force F4 must be applied. This pull-off force F4 is in most cases substantially less than the support force F3 to be applied by the die 2 during the pressing process.

Fig. 4 zeigt in schematischer Weise den Aufbau einer aus dem Stand der Technik bekannten Pulverpresse, mit welcher der ebenfalls bekannte Pressvorgang ausgeführt werden kann, wie er zu den Fig. 1 bis 3 beschrieben worden ist. Diese Pulverpresse umfasst einen Pressenrahmen 4, der mit einer Grundplatte 6 und einer oberen Platte 7 ausgestattet ist. Auf der Grundplatte 6 abgestützt ist der Unterstempel 3, dieser ist somit im Pressenrahmen 4 festgehalten. Der Oberstempel 1 ist über eine hydraulische Kolben-Zylinder-Einheit 8, welche an der oberen Platte 7 angebracht ist, vertikal verfahrbar. Im Pressenrahmen 4 angeordnet ist die Matrize 2, die ebenfalls in vertikaler Richtung verfahrbar ist. Hierzu ist die Matrize 2 an Säulen 9 befestigt, die in der Grundplatte 6 und der oberen Platte 7 geführt längs verschiebbar sind. Fig. 4 shows schematically the construction of a known from the prior art powder press, with which the likewise known pressing operation can be carried out, as to the Fig. 1 to 3 has been described. This powder press comprises a press frame 4 equipped with a base plate 6 and an upper plate 7. Supported on the base plate 6 is the lower punch 3, this is thus held in the press frame 4. The upper punch 1 is vertically movable via a hydraulic piston-cylinder unit 8, which is attached to the upper plate 7. In the press frame 4 is arranged the die 2, which is also movable in the vertical direction. For this purpose, the die 2 is attached to columns 9, which are guided longitudinally displaceable in the base plate 6 and the upper plate 7.

Am unteren Endbereich dieser Säulen 9 ist eine Verbindungsplatte 10 befestigt, welche die Säulen 9 miteinander verbindet.At the lower end portion of these columns 9, a connecting plate 10 is fixed, which connects the columns 9 with each other.

Unterhalb der Grundplatte 6 ist eine weitere, doppelt wirkende, hydraulische Kolben-Zylinder-Einheit 11 angeordnet. Hierbei ist der Kolben 12 im Zylinder 13 verschiebbar und von beiden Seiten mit Druckmedium beaufschlagbar. Auf der einen Seite des Kolbens 12 ist eine Kolbenstange 14 angebracht, die in bekannter Weise den Zylinder 13 durchdringt und mit der Verbindungsplatte 10 verbunden ist. Dadurch weist der Kolben 12 kolbenstangenseitig eine ringförmige Kolbenfläche 15 und gegenüberliegend eine kreisförmige Kolbenfläche 16 auf. Die kreisförmige Kolbenfläche 16 ist somit grösser als die ringförmige Kolbenfläche 15, die mit gleichem Druck des Druckmediums aufbringbaren Kräfte sind entsprechend unterschiedlich.Below the base plate 6, a further, double-acting, hydraulic piston-cylinder unit 11 is arranged. Here, the piston 12 in the cylinder 13 is displaceable and acted upon by pressure medium from both sides. On one side of the piston 12 is a piston rod 14th attached, which penetrates the cylinder 13 in a known manner and is connected to the connecting plate 10. As a result, the piston 12 piston rod side an annular piston surface 15 and opposite a circular piston surface 16. The circular piston surface 16 is thus larger than the annular piston surface 15, which can be applied with the same pressure of the pressure medium forces are correspondingly different.

Wie aus Fig. 2 ersichtlich ist, muss beim Pressvorgang die Matrize 2 die der Presskraft F1 entgegengerichteten Kräfte F3 aufbringen. Dies bedeutet, dass bei der aus dem Stand der Technik bekannten Ausführungsform einer Pulverpresse, wie sie in Fig. 4 dargestellt ist, die von der Matrize 2 aufzunehmende Kraft über die Säulen 9, die Verbindungsplatte 10 und die ringförmige Kolbenfläche 15 auf das im Zylinder 13 sich befindende Druckmedium überträgt.How out Fig. 2 it can be seen, the die 2 has to apply the forces F3 opposing the pressing force F1 during the pressing process. This means that in the known from the prior art embodiment of a powder press, as shown in Fig. 4 is shown, the force to be absorbed by the die 2 via the columns 9, the connecting plate 10 and the annular piston surface 15 transmits to the in-cylinder 13 located pressure medium.

Zum Abziehen der Matrize 2 vom Pressling 5, wie dies in Fig. 3 dargestellt ist, muss die Abzugskraft F4 aufgebracht werden, was durch Beaufschlagung der kreisförmigen Kolbenfläche 16 mit dem Druckmedium erfolgt.To remove the die 2 from the compact 5, as shown in Fig. 3 is shown, the withdrawal force F4 must be applied, which is done by acting on the circular piston surface 16 with the pressure medium.

Hieraus ist ersichtlich, dass, um alle Funktionen erfüllen zu können, die weitere Kolben-Zylinder-Einheit 11 gross dimensioniert werden muss, um die auf die Matrize 2 wirkende Abstützkraft über die ringförmige Kolbenfläche 15 aufnehmen zu können.It can be seen that in order to fulfill all functions, the further piston-cylinder unit 11 must be large in size to accommodate the force acting on the die 2 supporting force on the annular piston surface 15 can.

Die beiden Patentveröffentlichungen FR 2 095 120 A und JP 63 036 998 A zeigen Pulverpressen, bei welchen jeweils die Kolben-Zylinder-Einheit zur Betätigung der Matrize unterhalb der Grundplatte derart angeordnet ist, dass die Kreisfläche des Kolbens die Abstützung des Unterstempels aufnimmt und die Abziehkräfte auf die ringförmige Fläche des Kolbens wirkt. Dadurch erhält man insbesondere bei grossen Pulverpressen eine sehr grosse Arbeitshöhe.The two patent publications FR 2 095 120 A and JP 63 036 998 A show powder presses, wherein each of the piston-cylinder unit for actuating the die is arranged below the base plate such that the circular surface of the piston receives the support of the lower punch and the Abziehkräfte acts on the annular surface of the piston. This gives a very high working height, especially in the case of large powder presses.

Die Aufgabe der vorliegenden Erfindung besteht somit darin, eine Pulverpresse so zu gestalten, dass die Steuermittel zur Verschiebung der Matrize optimal dimensioniert werden können, wodurch einerseits eine kostengünstigere Konstruktion und andererseits eine Einsparung von Energie erreicht werden kann, und dass die Bauhöhe dieser Pulverpresse gering gehalten werden kann.The object of the present invention is therefore to design a powder press so that the control means for displacing the die can be optimally dimensioned, whereby on the one hand a less expensive construction and on the other hand a saving of energy can be achieved, and that kept low the height of this powder press can be.

Erfindungsgemäss erfolgt die Lösung dieser Aufgabe durch eine Pulverpresse mit den Merkmalen des Anspruchs 1.According to the invention, this object is achieved by a powder press having the features of claim 1.

Mit dieser Ausgestaltung der Pulverpresse können die vorgenannten Nachteile eliminiert werden. Die durch die weiteren Kolben-Zylinder-Einheiten aufzubringenden Kräfte können bei gleich bleibendem Druck durch kleinere Kolbenflächen erreicht werden, dadurch wird das Volumen der Zylinderräume kleiner, es muss weniger Druckmedium eingepumpt werden, was zur gewünschten Einsparung der Energie führt.With this embodiment of the powder press, the aforementioned disadvantages can be eliminated. The applied by the other piston-cylinder units forces can be achieved with constant pressure by smaller piston surfaces, thereby the volume of the cylinder chambers is smaller, it must be pumped less pressure medium, resulting in the desired saving of energy.

Die weiteren Kolben-Zylinder-Einheiten sind an der oberen Platte angebracht. Dadurch kann erreicht werden, dass die Arbeitshöhe bei der erfindungsgemässen Pulverpresse geringer wird, wodurch beispielsweise das Einlassen dieser Pulverpresse in eine Grube im Boden vermieden werden kann, was auch zu Kostenersparnis führt.The other piston-cylinder units are mounted on the upper plate. As a result, it can be achieved that the working height in the powder press according to the invention becomes lower, as a result of which, for example, the insertion of this powder press into a pit in the bottom can be avoided, which also leads to cost savings.

Indem die Matrize mit vertikal ausgerichteten Säulen ausgestattet ist, welche durch die obere Platte hindurchragen und an einer oberhalb der oberen Platte angeordneten weiteren Platte befestigt sind, welche weitere Platte mit den nach oben ragenden Kolbenstangen der weiteren Kolben-Zylinder-Einheiten verbunden ist, ergibt sich ein sehr einfacher Aufbau der Presse.By providing the die with vertically oriented columns which project through the upper plate and are secured to a further plate located above the upper plate, which further plate is connected to the upwardly projecting piston rods of the further piston-cylinder units a very simple construction of the press.

Eine vorteilhafte Ausgestaltung der Erfindung besteht darin, dass die Zylinder der weiteren Kolben-Zylinder-Einheiten in der oberen Platte eingelassen sind. Dadurch lässt sich erreichen, dass die gesamte Bauhöhe der Pulverpresse reduziert werden kann.An advantageous embodiment of the invention is that the cylinders of the further piston-cylinder units are embedded in the upper plate. This allows the entire height of the powder press to be reduced.

Zudem ist es vorteilhaft, wenn die weitere Platte mit einer zentralen Öffnung versehen ist, durch welche der Zylinder der hydraulischen Kolben-Zylinder-Einheit hindurch ragt. Auch dadurch lässt sich die Gesamtbauhöhe der Pulverpresse verringern.In addition, it is advantageous if the further plate is provided with a central opening through which the cylinder of the hydraulic piston-cylinder unit protrudes. This also reduces the overall height of the powder press.

Eine Ausgestaltung der Erfindung wird nachfolgend im Detail beschrieben, wobei auf die beiliegende Figur 5 Bezug genommen wird.An embodiment of the invention will be described below in detail, with reference to the accompanying FIG. 5 Reference is made.

Wie aus der schematischen Darstellung gemäss Fig. 5 ersichtlich ist, ist die erfindungsgemässe Pulverpresse im Wesentlichen gleich aufgebaut, wie die zu Fig. 4 beschriebene, aus dem Stand der Technik bekannte Pulverpresse. Für gleiche Bauteile werden der Einfachheit halber demzufolge dieselben Bezugszeichen verwendet. Die in Fig. 5 dargestellte Pulverpresse umfasst wiederum einen Pressenrahmen 4, welcher mit einer Grundplatte 6 und einer obe ren Platte 7 ausgestattet ist. Die Kolben-Zylinder-Einheit 8 zum Verfahren des Oberstempels 1 ist wiederum an der oberen Platte 7 befestigt. Der Unterstempel 3 ist auf der Grundplatte 6 ortsfest in der Pulverpresse gehalten. Die Matrize 2 ist an Säulen 9 befestigt, welche in der Grundplatte 6 und der oberen Platte 7 geführt verschiebbar gelagert sind.As shown in the schematic representation Fig. 5 it can be seen, the powder press according to the invention is constructed substantially the same as that to Fig. 4 described, known from the prior art powder press. For the same components, the same reference numerals are therefore used for the sake of simplicity. In the Fig. 5 shown powder press in turn comprises a press frame 4, which with a base plate 6 and an upper Ren plate 7 is equipped. The piston-cylinder unit 8 for moving the upper punch 1 is in turn attached to the upper plate 7. The lower punch 3 is held on the base plate 6 fixed in the powder press. The die 2 is fixed to columns 9, which are guided displaceably guided in the base plate 6 and the upper plate 7.

Die weiteren doppelt wirkenden hydraulischen Kolben-Zylinder-Einheiten 17 sind bei dieser erfindungsgemässen Pulverpresse in der oberen Platte 7 angeordnet. Der jeweilige Zylinderraum 18 besteht aus einer Bohrung, die in der oberen Platte 7 angebracht sind. In diesem Zylinderraum ist jeweils ein Kolben 19 eingesetzt, der mit einer Kolbenstange 20 versehen ist, die über eine weitere Bohrung obenseitig aus der oberen Platte 7 vorstehen. Der Zylinderraum 18 ist jeweils über eine Abdeckplatte 21 gegen unten verschlossen.The other double-acting hydraulic piston-cylinder units 17 are arranged in the upper plate 7 in this inventive powder press. The respective cylinder chamber 18 consists of a bore which are mounted in the upper plate 7. In this cylinder chamber, a piston 19 is used in each case, which is provided with a piston rod 20, which protrude above a further bore above the upper plate 7. The cylinder chamber 18 is closed in each case via a cover plate 21 against the bottom.

Selbstverständlich ist es auch denkbar, in entsprechende Bohrungen in der oberen Platte 7 auch komplette Kolben-Zylinder-Einheiten einzusetzen.Of course, it is also conceivable to use in corresponding holes in the upper plate 7 and complete piston-cylinder units.

An den oberen Enden der Kolbenstangen 20 ist eine weitere Platte 22 befestigt, welche die Kolbenstangen 20 verbinden. An dieser weiteren Platte 22 sind die Säulen 9 befestigt, mit welchen die Matrize 2 verschiebbar gehalten ist.At the upper ends of the piston rods 20, a further plate 22 is fixed, which connect the piston rods 20. At this further plate 22, the columns 9 are fixed, with which the die 2 is slidably held.

Die weitere Platte 22 ist mit einer zentralen Öffnung 23 versehen, durch welche der Zylinder 24 der Kolben-Zylinder-Einheit 8 hindurchragt, wodurch die Bauhöhe der Maschine gering gehalten werden kann.The further plate 22 is provided with a central opening 23 through which the cylinder 24 of the piston-cylinder unit 8 protrudes, whereby the height of the machine can be kept low.

Aus der Anordnung der weiteren Kolben-Zylinder-Einheiten 17 in der oberen Platte 7 zeigt sich, dass die von der Matrize 2 aufzunehmende Abstützkraft beim Pressvorgang über die kreisförmigen Kolbenflächen 25 der Kolben 19 auf das darunter befindliche Druckmedium übertragen werden. Die Abziehkraft der Matrize 2 wird durch Beaufschlagung der ringförmigen Kolbenfläche 26 des Kolbens 19 erzeugt. Daraus ist ersichtlich, dass zur Aufnahme der grösseren Abstützkraft die grösseren kreisförmigen Kolbenflächen 25 der Kolben 19 beaufschlagt werden, während zum Aufbringen der kleineren Abziehkraft für die Matrize 2 die kleineren ringförmigen Kolbenflächen 26 beaufschlagt werden. Dadurch werden die gewünschten und optimalen Verhältnisse zur Steuerung der Matrize 2 erreicht. Mit dieser Anordnung braucht es, wie bereits erwähnt worden ist, ein geringeres zu bewegendes Druckmedium, wodurch Energie gespart werden kann.From the arrangement of the further piston-cylinder units 17 in the upper plate 7, it can be seen that the supporting force to be absorbed by the die 2 during the pressing process is transmitted via the circular piston surfaces 25 of the pistons 19 to the pressure medium underneath. The peel force of the die 2 is generated by acting on the annular piston surface 26 of the piston 19. It can be seen that the larger circular piston surfaces 25 of the piston 19 are acted upon to accommodate the larger support force, while for applying the smaller peel force for the die 2, the smaller annular piston surfaces 26 are acted upon. As a result, the desired and optimal conditions for controlling the die 2 are achieved. With this arrangement, as already mentioned, it takes a smaller amount of pressure medium to be moved, whereby energy can be saved.

Bei dieser erfindungsgemässen Pulverpresse, wie sie in Fig. 5 dargestellt ist, kann die Arbeitshöhe, dargestellt durch den Doppelpfeil 27, gering gehalten werden. Im Vergleich dazu ist die Arbeitshöhe der aus dem Stand der Technik bekannten Pulverpresse, wie sie in Fig. 4 gezeigt ist, dargestellt durch den Doppelpfeil 28, wesentlich höher. Damit lässt sich mit der erfindungsgemässen Pulverpresse gemäss Fig. 5 unter Umständen vermeiden, dass diese Pulverpresse in eine Grube im Boden gestellt werden muss, um eine angenehme Arbeitshöhe zu erreichen, was das Aufstellen dieser Pulverpresse wesentlich vereinfacht.In this inventive powder press, as in Fig. 5 is shown, the working height, represented by the double arrow 27, can be kept low. In comparison, the working height of the known from the prior art powder press, as shown in Fig. 4 shown by the double arrow 28, much higher. This can be according to the invention with the powder press according to Fig. 5 It may not be necessary to place this powder press in a pit in the ground to reach a comfortable working height, which greatly simplifies the installation of this powder press.

Claims (3)

  1. Powder press for manufacturing mouldings (5) from metal powder, comprising a press frame (4) with a base plate (6) and an upper plate (7), a lower punch (3), which is firmly connected to the base plate (6), an upper punch (1), which is vertically displaceable via a hydraulic piston-cylinder unit (8) installed on the upper plate (7), and a die (2), which is also displaceable in vertical direction, driven further via double-acting hydraulic piston-cylinder units (11; 17), on whose pistons(12; 19) a piston rod (14; 20) is installed in each case on one side and the piston (12; 19) thus has on the piston rod side a circular piston surface (15; 26) and opposite a circular piston surface (16; 25), wherein the further piston-cylinder units (17) being arranged in such a way in the press frame (4) that during the pressing process the vertical force (F1) acting from the upper punch (1) on the die (2) is able to be supported via the circular piston surface (25), and in that the retention force exerted on the die (2) after the pressing procedure is able to be applied via the circular piston surface (26), characterised in that the further piston-cylinder units (17) are installed on the upper plate (7) and the die (2) is provided with vertically aligned columns (9) which project through the upper plate (7) and are attached to a further plate (22) disposed above the upper plate (7), which further plate (22) is connected to the upwardly protruding piston rod (20) of the further piston-cylinder units (17).
  2. Powder press according to claim 1, characterised in that the cylinders (18) of the further piston-cylinder units (17) are inserted in the upper plate (7).
  3. Powder press according to claim 1 or 2, characterised in that the further plate (22) is provided with a central opening (23), through which the cylinder (24) of the hydraulic piston-cylinder unit (8) protrudes.
EP20070101629 2007-02-02 2007-02-02 Powder press for manufacturing mouldings from metal powder Not-in-force EP1952975B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20070101629 EP1952975B1 (en) 2007-02-02 2007-02-02 Powder press for manufacturing mouldings from metal powder

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EP20070101629 EP1952975B1 (en) 2007-02-02 2007-02-02 Powder press for manufacturing mouldings from metal powder

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EP1952975B1 true EP1952975B1 (en) 2014-11-19

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8033805B2 (en) 2007-11-27 2011-10-11 Kennametal Inc. Method and apparatus for cross-passageway pressing to produce cutting inserts
US8062014B2 (en) 2007-11-27 2011-11-22 Kennametal Inc. Method and apparatus using a split case die to press a part and the part produced therefrom
EP2311587A1 (en) * 2009-10-13 2011-04-20 Osterwalder AG Powder press
DE102011100618A1 (en) 2010-12-30 2012-07-05 Sms Meer Gmbh Powder press or powder press adapter and method for operating a powder press
DE102011116552B4 (en) 2011-10-21 2015-08-20 Fette Compacting Gmbh Press
DE102012013229B4 (en) * 2012-07-04 2014-10-09 Sms Meer Gmbh powder Press
DE102012013227B4 (en) 2012-07-04 2014-12-31 Sms Meer Gmbh powder Press
AT525262B1 (en) 2021-12-13 2023-02-15 Miba Sinter Austria Gmbh Process for pressing a green body

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Publication number Priority date Publication date Assignee Title
DE2033891A1 (en) 1970-07-03 1972-02-03 Mannesmann-Meer AG, 4050 Mönchengladbach Hydraulic powder press, in particular for processing metal powder
FR2141434B1 (en) * 1971-06-02 1973-06-29 Lorraine Carbone
US4439129A (en) * 1982-10-26 1984-03-27 Wehr Corporation Hydraulic refractory press including floating upper and lower plunger assemblies
JPS6336998A (en) 1986-07-31 1988-02-17 Sumitomo Electric Ind Ltd Upper ram lifting mechanism of powder molding press
JPH0777679B2 (en) * 1986-12-31 1995-08-23 明 平井 Powder molding equipment
DE4336744C2 (en) * 1993-10-28 1995-10-19 Manfred Gillenberg Installation on a press for the production of moldings
FR2769257B1 (en) * 1997-10-02 1999-12-10 Commissariat Energie Atomique PRESS TO FORM TABLETS

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