EP1566231A2 - Powder press - Google Patents

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Publication number
EP1566231A2
EP1566231A2 EP05001884A EP05001884A EP1566231A2 EP 1566231 A2 EP1566231 A2 EP 1566231A2 EP 05001884 A EP05001884 A EP 05001884A EP 05001884 A EP05001884 A EP 05001884A EP 1566231 A2 EP1566231 A2 EP 1566231A2
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EP
European Patent Office
Prior art keywords
punches
press
hydraulic cylinder
die
powder press
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
EP05001884A
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German (de)
French (fr)
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EP1566231B1 (en
EP1566231A3 (en
Inventor
Jürgen Hinzpeter
Ingo Schmidt
Andreas Groth
Andreas Teetzen
Thomas Pannewitz
Holger Behns
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Fette GmbH
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Fette GmbH
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Publication of EP1566231A3 publication Critical patent/EP1566231A3/en
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Classifications

    • 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
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005—Control arrangements
    • 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
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0094—Press load monitoring means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/065—Press rams
    • B30B15/067—Press rams with means for equalizing the pressure exerted by a plurality of press rams
    • 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
    • B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the invention relates to a powder press for the production of compacts from powdered press material according to the claim.
  • molded parts made of hard metal, ceramic, sintered metals or the like to produce with the help of presses.
  • the powdery or granular material is formed by pressing into a molding, which then undergoes a sintering process is subjected.
  • a press has a top and a bottom stamp, with a die or a die hole in a die plate interact.
  • the punches are driven by a suitable power drive, either mechanically or hydraulically via suitable hydraulic cylinders. It is known to arrange the die plate firmly and upper and lower punches too move or alternatively to move the die plate and the upper punch to while the lower punch remains stationary.
  • Hydraulic presses have the advantage of being relatively freely programmable Press sequence can be achieved.
  • DE 4 209 767 C1 discloses the pressing force Measure to obtain the most uniform density within a batch to reach. Depending on the measured pressing force is then a Correction made over the filling for the subsequent compacts. at This method determines the position of the stamps and the associated Pressing force measured. The approach of a certain position leads to a relative high dimensional accuracy, may cause different densities. If, however, the pressing process is terminated at a preset pressing force, there is a risk that the compact has different thicknesses.
  • the aim of all procedures is to ensure, by means of appropriate regulatory that even with changing powder within a batch always one same press result is achieved.
  • a production cycle consists of several phases: filling the material, moving together the stamp, compression of the press material, press holding time, extension of the compact and its removal.
  • the removal is usually by a automatic removal system.
  • To increase the output of the press an attempt is made to shorten the times of the individual phases.
  • the times for compacting the powder, the press holding time and the time to extend the compact depends on the type of powder used and the geometry of the compact. Too short compaction, press holding and ejection times lead to hairline cracks in the compact, which must be avoided at all costs. For this reason, the output of modern hydraulic powder presses currently at max. 30 pieces per minute limited.
  • the invention has for its object to provide a powder press for the production of To create compacts of powdered molding material with which the ejection performance can be significantly increased without a loss of press accuracy must be accepted.
  • the powder press according to the invention is a fixed or movable Matrizenplatte provided with at least two matrices or a die with at least two die holes.
  • at least two upper punch provided with the matrices or Matrizenbohronne cooperate and act individually or mechanically coupled are. They are operated by two or a single hydraulic cylinder.
  • at least two lower punches are provided, which with the matrices or Matrizenbohronne cooperate and each have their own or a common Have drive by means of a hydraulic cylinder.
  • the upper stamps are one or two position sensors and the lower one or two position sensors assigned.
  • the hydraulic cylinders are assigned a force sensor.
  • a process computer for the powder press according to the invention at least three regulators, namely a controller for the hydraulic cylinder of the upper or lower punch and one controller each for the hydraulic cylinders of the or upper stamp.
  • the algorithm by which the individual controllers work can be in conventional Be formulated. So z. As a rule after a Kraftweg- or a Force time diagram or after the energy input possible. For all regulations is previously the target diagram with the help of suitable experiments and measurements determined during the actual production is regulated.
  • the powder press according to the invention With the aid of the powder press according to the invention, two or more compacts be generated simultaneously, the pressing operations for the individual compacts be influenced separately, whereby z. B. powder variations and tool tolerances be compensated.
  • the powder press according to the invention allows thus a large press accuracy by separately influencing the pressing operations.
  • the removal of the manufactured compacts by the sampling system can in one or several steps, with the removal in one step because of the shorter cycle time is preferable.
  • simultaneous Pressing and removal of several compacts is the output of the press multiplied according to the number of simultaneously pressed compacts without the pressing accuracy suffers.
  • a press for pressing powdery press material is schematic shown. It has a fixed die plate 10, the two Matrices 12, 14 each includes a die bore. Above the die plate 10, two upper punches 16 are arranged, which cooperate with the dies 12, 14. The upper punches 16 are mechanically interconnected by a block 18 coupled. The block 18 is actuated by a hydraulic cylinder 20.
  • Two lower punches 22 cooperate with the dies 12, 14 and are respectively actuated by a hydraulic cylinder 24 and 26, respectively.
  • the upper stamp 16 is a Assigned to position sensor 28 and the hydraulic cylinder 20 is a force sensor 30th assigned.
  • the actuation of the hydraulic cylinder and the upper punch 16 takes place by means of a regulator 32 in accordance with the values of force sensor 30 and position sensor 28 according to a predetermined algorithm, for example a force path or force time chart.
  • As an actuator serves a control valve 34 for the Hydraulic cylinder 20.
  • the lower punches 22 each have their own position sensor 36 or assigned to 38 and applied by the hydraulic cylinders 24, 26 force is determined with separate force sensors 40 and 42, respectively.
  • the algorithm for the controllers 44, 46 corresponds to z. B. the after the Regulator 32 works.
  • the manipulated variables of the controllers 44 and 46 are via control valves 48 and 50 are given to the hydraulic cylinders 24, 26.
  • a hydraulic drive assembly 50 has two concentrically arranged annular piston 52, 56 which in corresponding Ring cylinders are guided.
  • annular piston 52, 56 which in corresponding Ring cylinders are guided.

Abstract

A powder press receives metal powder which is placed into forms which are then pressed and sintered. The powder press has a matrix plate (10) with two matrices (12, 14) each with an array of matrix drill holes. The press further has two overhead plungers acting on the matrices, a hydraulic cylinder (20) for the upper plunger (16) and two lower plungers acting on the matrices (12, 14). The assembly further has position sensors for the upper and lower plungers, force sensors and a hydraulic regulator.

Description

Die Erfindung bezieht sich auf eine Pulverpresse zur Herstellung von Presslingen aus pulverförmigem Pressmaterial nach dem Patentanspruch.The invention relates to a powder press for the production of compacts from powdered press material according to the claim.

Es ist bekannt, Formteile aus Hartmetall, Keramik, Sintermetallen oder dergleichen mit Hilfe von Pressen herzustellen. Das pulverförmige bzw. granuläre Material wird mit Hilfe von Pressen zu einem Formling geformt, der anschließend einem Sinterprozeß unterworfen wird. Eine Presse weist einen Ober- und einen Unterstempel auf, die mit einer Matrize bzw. einer Matrizenbohrung in einer Matrizenplatte zusammenwirken. Die Stempel werden von einem geeigneten Kraftantrieb angetrieben, entweder mechanisch oder hydraulisch über geeignete Hydraulikzylinder. Es ist bekannt, die Matrizenplatte fest anzuordnen und Ober- und Unterstempel zu bewegen oder alternativ die Matrizenplatte zu verfahren und den Oberstempel zu verstellen, während der Unterstempel stationär bleibt.It is known, molded parts made of hard metal, ceramic, sintered metals or the like to produce with the help of presses. The powdery or granular material is formed by pressing into a molding, which then undergoes a sintering process is subjected. A press has a top and a bottom stamp, with a die or a die hole in a die plate interact. The punches are driven by a suitable power drive, either mechanically or hydraulically via suitable hydraulic cylinders. It is known to arrange the die plate firmly and upper and lower punches too move or alternatively to move the die plate and the upper punch to while the lower punch remains stationary.

Wesentlich für die reproduzierbare Herstellung von Pulverpresslingen ist, dass der Pressling eine homogene Struktur erhält bei einer vorgegebenen Dichte. Presslinge mit geringer Dichte schwinden beim Sintern schneller als Presslinge mit höherer Dichte. Durch unterschiedlich einstellbare Presswege von Unter- und Oberstempel kann versucht werden, Dichteabweichungen zu minimieren. Andererseits können unterschiedliche Dichten in der Praxis durch unterschiedliche Presskräfte entstehen, die wiederum bei gleicher Höhe der Presslinge, z. B. aufgrund von Füllschwankungen, die bis zu einigen Prozenten gehen, hervorgerufen werden.Essential for the reproducible production of powder compacts is that the Pressling obtains a homogeneous structure at a given density. compacts with low density shrink faster during sintering than pellets with higher Density. By differently adjustable pressing paths of lower and upper punches an attempt can be made to minimize density deviations. On the other hand different densities arise in practice due to different pressing forces, in turn, at the same height of the compacts, z. B. due to filling fluctuations, that go up to a few percent, be evoked.

Hydraulische Pressen haben den Vorteil, dass ein relativ frei programmierbarer Pressablauf erzielt werden kann. Aus DE 4 209 767 C1 ist bekannt, die Presskraft zu messen, um eine möglichst gleichmäßige Dichte innerhalb einer Charge zu erreichen. In Abhängigkeit von der gemessenen Presskraft wird anschließend eine Korrektur über die Füllung für die nachfolgenden Presslinge vorgenommen. Bei diesem Verfahren wird die Position der Stempel bestimmt und die dazugehörende Presskraft gemessen. Das Anfahren einer bestimmten Position führt zu einer relativ hohen Formgenauigkeit, verursacht unter Umständen unterschiedliche Dichten. Wird hingegen bei einer voreingestellten Presskraft der Pressvorgang beendet, besteht die Gefahr, dass der Pressling unterschiedliche Dicken hat.Hydraulic presses have the advantage of being relatively freely programmable Press sequence can be achieved. DE 4 209 767 C1 discloses the pressing force Measure to obtain the most uniform density within a batch to reach. Depending on the measured pressing force is then a Correction made over the filling for the subsequent compacts. at This method determines the position of the stamps and the associated Pressing force measured. The approach of a certain position leads to a relative high dimensional accuracy, may cause different densities. If, however, the pressing process is terminated at a preset pressing force, there is a risk that the compact has different thicknesses.

Aus DE 197 17 217 C2 ist bekannt geworden, abhängig von der Geometrie des Presslings und des Ausgangsmaterials während der Kompression für einen Pressstempel ein gewünschtes Kraftwegdiagramm (Sollkurve) vorab zu ermitteln und zu speichern. In einem Rechner für den Herstellungsprozess werden während der Kompression die gemessenen Werte für den Weg und die Kraft des Pressstempels mit der Sollkurve verglichen. Mittels mindestens eines separat betätigten Abschnitts des Pressstempels oder eines getrennten Stempels wird der Druck auf das Pressmaterial während der Kompressionsphase erhöht oder verringert, sobald eine Abweichung von der Sollkurve ermittelt wird. Bei diesem Verfahren müssen mindestens zwei Positionssensoren vorgesehen werden, nämlich für den mindestens einen Pressstempel und den mindestens einen weiteren Pressstempel. Aus DE 100 10 671 C2 ist bekannt geworden, durch vorangehende Versuche für einen gewünschten Pressling ein Kraftzeitdiagramm zu erstellen, nach dem der Unter- oder Oberstempel während der Kompression verstellt wird. Das Nachfahren nach dem Kraftzeitdiagramm erfordert ebenfalls einen Regler, wie bei dem weiter oben beschriebenen Verfahren.From DE 197 17 217 C2 has become known, depending on the geometry of the Presslings and the starting material during compression for a press die to determine a desired Kraftwegdiagramm (setpoint curve) in advance and to to save. In a calculator for the manufacturing process will be during the Compression the measured values for the way and the force of the press ram compared with the nominal curve. By means of at least one separately actuated section of the ram or a separate punch, the pressure on the Pressing material during the compression phase increases or decreases as soon as a Deviation from the setpoint curve is determined. In this process, at least two position sensors are provided, namely for the at least a punch and the at least one other punch. From DE 100 10 671 C2 has become known through previous attempts for one to produce a force time diagram according to which or upper punch is adjusted during compression. The descendant after The power timing diagram also requires a regulator, as in the above described method.

Aus DE 1 042 772 C2 ist bekannt geworden, für einen Pressling vorgegebener Geometrie und Abmessungen sowie vorgegebenen Materials den Wert für die vom Oberstempel einzubringende Energie zu speichern. Ferner wird als zweiter Wert die vom Ober- und Unterstempel insgesamt einzutragende Energie gespeichert. Während der Kompression wird der Vorschub des Oberstempels beendet, wenn sein Energieeintrag den vorgegebenen ersten Wert erreicht hat, und der Vorschub des Unterstempels erfolgt nach Maßgabe des Restenergieeintrags und wird beendet, wenn die Gesamtenergie den zweiten vorgegebenen Wert erreicht hat. Auch hierfür ist ebenfalls eine Regelung erforderlich.From DE 1 042 772 C2 has become known, given for a compact Geometry and dimensions as well as given material the value for the Upper punch to save energy to be incorporated. Furthermore, the second value is the Total energy to be entered from the top and bottom stamps. While compression of the upper punch will be stopped if it is Energy input has reached the predetermined first value, and the feed of the Unterstempels takes place in accordance with the residual energy input and is terminated, when the total energy has reached the second predetermined value. Also for this a regulation is also required.

Ziel aller Verfahren ist, mit Hilfe geeigneter Regelungsvorkehrungen sicherzustellen, dass auch bei sich veränderndem Pulver innerhalb einer Charge immer ein gleiches Pressergebnis erzielt wird.The aim of all procedures is to ensure, by means of appropriate regulatory that even with changing powder within a batch always one same press result is achieved.

Ein Produktionszyklus besteht aus mehreren Phasen: Füllen des Materials, Zusammenfahren der Stempel, Verdichten des Pressmaterials, Presshaltezeit, Ausfahren des Presslings und seine Entnahme. Die Entnahme erfolgt normalerweise durch ein automatisches Entnahmesystem. Um die Ausstossleistung der Presse zu erhöhen, wird versucht, die Zeiten der einzelnen Phasen zu verkürzen. In dieser Hinsicht bestehen verfahrenstechnische Grenzen, die einer Zykluszeitverringerung entgegenstehen. Die Zeiten für das Verdichten des Pulvers, die Presshaltezeit und die Zeit zum Ausfahren des Presslings ist abhängig von der Art des eingesetzten Pulvers und der Geometrie des Presslings. Zu kurze Verdichtungs-, Presshalte- und Ausstosszeiten führen zu Haarrissen im Pressling, was unbedingt vermieden werden muss. Aus diesem Grund ist die Ausstossleistung moderner hydraulischer Pulverpressen derzeit auf max. 30 Stück pro Minute begrenzt.A production cycle consists of several phases: filling the material, moving together the stamp, compression of the press material, press holding time, extension of the compact and its removal. The removal is usually by a automatic removal system. To increase the output of the press, an attempt is made to shorten the times of the individual phases. In this regard There are procedural limits that prevent cycle time reduction. The times for compacting the powder, the press holding time and the time to extend the compact depends on the type of powder used and the geometry of the compact. Too short compaction, press holding and ejection times lead to hairline cracks in the compact, which must be avoided at all costs. For this reason, the output of modern hydraulic powder presses currently at max. 30 pieces per minute limited.

Der Erfindung liegt die Aufgabe zugrunde, eine Pulverpresse zur Herstellung von Presslingen aus pulverförmigem Pressmaterial zu schaffen, mit der die Ausstossleistung deutlich gesteigert werden kann, ohne dass eine Einbuße an Pressgenauigkeit hingenommen werden muß. The invention has for its object to provide a powder press for the production of To create compacts of powdered molding material with which the ejection performance can be significantly increased without a loss of press accuracy must be accepted.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Bei der erfindungsgemäßen Pulverpresse ist eine feststehende oder bewegliche Matrizenplatte vorgesehen mit mindestens zwei Matrizen oder einer Matrize mit mindestens zwei Matrizenbohrungen. Bei der erfindungsgemäßen Pulverpresse sind ferner mindestens zwei Oberstempel vorgesehen, die mit den Matrizen bzw. Matrizenbohrungen zusammenwirken und einzeln wirken oder mechanisch gekoppelt sind. Sie werden von zwei bzw. einem einzigen hydraulischen Zylinder betätigt. Ferner sind mindestens zwei Unterstempel vorgesehen, die mit den Matrizen bzw. Matrizenbohrungen zusammenwirken und jeweils einen eigenen oder einen gemeinsamen Antrieb mittels eines Hydraulikzylinders aufweisen. Den Oberstempeln sind ein oder zwei Positionssensoren und den Unterstempeln ein oder zwei Positionssensoren zugeordnet. Den Hydraulikzylindern ist ein Kraftsensor zugeordnet. Schließlich weist ein Prozessrechner für die erfindungsgemäße Pulverpresse mindestens drei Regler auf, nämlich einen Regler für den Hydraulikzylinder der Ober- oder Unterstempel und jeweils einen Regler für die Hydraulikzylinder der Unter- oder Oberstempel.In the powder press according to the invention is a fixed or movable Matrizenplatte provided with at least two matrices or a die with at least two die holes. In the powder press according to the invention are Furthermore, at least two upper punch provided with the matrices or Matrizenbohrungen cooperate and act individually or mechanically coupled are. They are operated by two or a single hydraulic cylinder. Furthermore, at least two lower punches are provided, which with the matrices or Matrizenbohrungen cooperate and each have their own or a common Have drive by means of a hydraulic cylinder. The upper stamps are one or two position sensors and the lower one or two position sensors assigned. The hydraulic cylinders are assigned a force sensor. Finally, a process computer for the powder press according to the invention at least three regulators, namely a controller for the hydraulic cylinder of the upper or lower punch and one controller each for the hydraulic cylinders of the or upper stamp.

Der Algorithmus, nach dem die einzelnen Regler arbeiten, kann in herkömmlicher Weise formuliert sein. So ist z. B. eine Regelung nach einem Kraftweg- oder einem Kraftzeitdiagramm oder auch nach dem Energieeintrag möglich. Bei allen Regelungen ist zuvor mit Hilfe geeigneter Versuche und Messungen das Solldiagramm zu ermitteln, denen während der eigentlichen Produktion regelnd nachgefahren wird.The algorithm by which the individual controllers work can be in conventional Be formulated. So z. As a rule after a Kraftweg- or a Force time diagram or after the energy input possible. For all regulations is previously the target diagram with the help of suitable experiments and measurements determined during the actual production is regulated.

Mit Hilfe der erfindungsgemäßen Pulverpresse können zwei oder mehr Presslinge gleichzeitig erzeugt werden, wobei die Pressvorgänge für die einzelnen Presslinge getrennt beeinflusst werden, wodurch z. B. Pulverschwankungen und Werkzeugtoleranzen ausgeglichen werden. Die erfindungsgemäße Pulverpresse ermöglicht somit eine große Pressgenauigkeit durch getrennte Beeinflussung der Pressvorgänge.With the aid of the powder press according to the invention, two or more compacts be generated simultaneously, the pressing operations for the individual compacts be influenced separately, whereby z. B. powder variations and tool tolerances be compensated. The powder press according to the invention allows thus a large press accuracy by separately influencing the pressing operations.

Die Entnahme der gefertigten Presslinge durch das Entnahmesystem kann in einem oder mehreren Arbeitsschritten erfolgen, wobei die Entnahme in einem Arbeitsschritt wegen der kürzeren Zykluszeit vorzuziehen ist. Durch das gleichzeitige Pressen und Entnehmen mehrerer Presslinge wird die Ausstossleistung der Presse nach Maßgabe der Anzahl gleichzeitig gepresster Presslinge vervielfacht, ohne dass die Pressgenauigkeit darunter leidet.The removal of the manufactured compacts by the sampling system can in one or several steps, with the removal in one step because of the shorter cycle time is preferable. By the simultaneous Pressing and removal of several compacts is the output of the press multiplied according to the number of simultaneously pressed compacts without the pressing accuracy suffers.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand einer Zeichnung näher erläutert.

Figur 1
zeigt ein Blockschaltbild einer ersten Ausführungsform einer Presse nach der Erfindung,
Figur 2
zeigt ein Blockschaltbild einer zweiten Ausführungsform einer Presse nach der Erfindung.
Embodiments of the invention will be explained in more detail with reference to a drawing.
FIG. 1
shows a block diagram of a first embodiment of a press according to the invention,
FIG. 2
shows a block diagram of a second embodiment of a press according to the invention.

In der Figur ist eine Presse zum Pressen von pulverförmigem Pressmaterial schematisch dargestellt. Sie weist eine feststehende Matrizenplatte 10 auf, die zwei Matrizen 12, 14 enthält mit jeweils einer Matrizenbohrung. Oberhalb der Matrizenplatte 10 sind zwei Oberstempel 16 angeordnet, die mit den Matrizen 12, 14 zusammenwirken. Die Oberstempel 16 sind durch einen Block 18 mechanisch miteinander gekoppelt. Der Block 18 wird von einem Hydraulikzylinder 20 betätigt.In the figure, a press for pressing powdery press material is schematic shown. It has a fixed die plate 10, the two Matrices 12, 14 each includes a die bore. Above the die plate 10, two upper punches 16 are arranged, which cooperate with the dies 12, 14. The upper punches 16 are mechanically interconnected by a block 18 coupled. The block 18 is actuated by a hydraulic cylinder 20.

Zwei Unterstempel 22 wirken mit den Matrizen 12, 14 zusammen und sind jeweils von einem Hydraulikzylinder 24 bzw. 26 betätigt. Den Oberstempeln 16 ist ein Positionssensor 28 zugeordnet und dem Hydraulikzylinder 20 ist ein Kraftsensor 30 zugeordnet. Die Betätigung des Hydraulikzylinders und der Oberstempel 16 erfolgt mit Hilfe eines Reglers 32 nach Maßgabe der Werte von Kraftsensor 30 und Positionssensor 28 nach einem vorgegebenen Algorithmus beispielsweise einem Kraftweg- oder Kraftzeitdiagramm. Als Stellglied dient ein Regelventil 34 für den Hydraulikzylinder 20.Two lower punches 22 cooperate with the dies 12, 14 and are respectively actuated by a hydraulic cylinder 24 and 26, respectively. The upper stamp 16 is a Assigned to position sensor 28 and the hydraulic cylinder 20 is a force sensor 30th assigned. The actuation of the hydraulic cylinder and the upper punch 16 takes place by means of a regulator 32 in accordance with the values of force sensor 30 and position sensor 28 according to a predetermined algorithm, for example a force path or force time chart. As an actuator serves a control valve 34 for the Hydraulic cylinder 20.

Wie zu erkennen, ist den Unterstempeln 22 jeweils ein eigener Positionssensor 36 bzw. 38 zugeordnet und die von den Hydraulikzylindern 24, 26 aufgebrachte Kraft wird mit separaten Kraftsensoren 40 bzw. 42 ermittelt. Die Betätigung der Hydraulikzylinder 24, 26 erfolgt über getrennte Regler 44 bzw. 46 nach Maßgabe der Daten, die von den Positionssensoren 36, 38 bzw. Kraftsensoren 40, 42 geliefert werden. Der Algorithmus für die Regler 44, 46 entspricht z. B. dem nach dem der Regler 32 arbeitet. Die Stellgrößen der Regler 44 bzw. 46 werden über Regelventile 48 bzw. 50 auf die Hydraulikzylinder 24, 26 gegeben.As can be seen, the lower punches 22 each have their own position sensor 36 or assigned to 38 and applied by the hydraulic cylinders 24, 26 force is determined with separate force sensors 40 and 42, respectively. The actuation of the Hydraulic cylinders 24, 26 via separate controller 44 and 46 in accordance with the data supplied by the position sensors 36, 38 and force sensors 40, 42, respectively become. The algorithm for the controllers 44, 46 corresponds to z. B. the after the Regulator 32 works. The manipulated variables of the controllers 44 and 46 are via control valves 48 and 50 are given to the hydraulic cylinders 24, 26.

Es ist zu erkennen, dass mit einem minimalen apparativen Aufwand eine hohe Ausstossleistung mit einer Presse erzielt wird, bei gleichzeitig hoher Pressgenauigkeit für jede Achse, da jede Achse getrennt geregelt wird.It can be seen that with a minimal amount of equipment, a high output achieved with a press, at the same time high press accuracy for each axis, as each axis is controlled separately.

Es versteht sich, daß naturgemäß auch die Oberstempel 16 durch getrennte Hydraulikzylinder betätigt werden können und somit auch getrennt im Hinblick auf die Kräfte und die sonstigen Daten überwacht werden können. Es verseht sich ferner, daß statt des separaten Antriebs für die Unterstempel 22 durch die Hydraulikzylinder 24, 26 auch ein gekoppelter Antrieb möglich ist wie für die Oberstempel 16 gezeigt, während die Oberstempel separat durch eigene Hydraulikzylinder angetrieben werden. In jedem Falle wird das angestrebte Ziel erreicht, eine individuelle Verpressung in den Matrizenbohrungen 12 zu erhalten. It is understood that naturally also the upper punches 16 by separate Hydraulic cylinder can be actuated and thus also separated with regard to the forces and other data can be monitored. It further provides that instead of the separate drive for the lower punch 22 by the hydraulic cylinder 24, 26 also a coupled drive is possible as for the upper punch 16 shown while the upper punches are driven separately by their own hydraulic cylinders become. In any case, the desired goal is achieved, an individual To obtain compression in the die holes 12.

Soweit bei der Ausführungsform nach Fig. 2 gleiche Teile wie in Fig. 1 verwendet werden, sind sie mit gleichen Bezugszeichen versehen.As far as used in the embodiment of Fig. 2 the same parts as in Fig. 1 are, they are provided with the same reference numerals.

Die Besonderheit bei Fig. 2 besteht darin, daß eine hydraulische Antriebsanordnung 50 zwei konzentrisch angeordnete Ringkolben 52, 56 aufweist, die in entsprechenden Ringzylindern geführt sind. Werden, wie in Fig. 1 gezeigt, übliche Hydraulikzylinder nebeneinander angeordnet, ist der Abstand zwischen den Unterstempeln 22 relativ groß. Mit Hilfe einer Ringanordnung, wie sie in Fig. 2 dargestellt ist, läßt sich dieser Abstand beträchtlich verringern.The peculiarity of Fig. 2 is that a hydraulic drive assembly 50 has two concentrically arranged annular piston 52, 56 which in corresponding Ring cylinders are guided. Are, as shown in Fig. 1, conventional hydraulic cylinder arranged side by side, the distance between the lower punches 22nd relatively large. With the aid of a ring arrangement, as shown in Fig. 2, can be reduce this distance considerably.

Es versteht sich, daß auch die Oberstempel 16 zusätzlich oder alternativ mit einer Ringzylinderanordnung angetrieben werden können, wobei jeder Ringkolben in seiner Position und im Hinblick auf die Preßkräfte separat detektiert werden kann.It is understood that the upper punches 16 additionally or alternatively with a Ring cylinder assembly can be driven, each annular piston in his Position and with regard to the pressing forces can be detected separately.

Schließlich versteht sich, daß bei Pressen, bei denen eine angetriebene Matrizenplatte verwendet wird, während die Unterstempel stationär sind, die beschriebene Anordnung ebenfalls eingesetzt werden kann. In diesem Falle ist es zweckmäßig, die Oberstempel separat anzutreiben und ihren Betrieb separat zu regeln, während die Matrizenplatte durch einen oder mehrere Hydraulikzylinder verstellt wird.Finally, it is understood that in presses where a driven die plate is used while the lower dies are stationary, the described Arrangement can also be used. In this case, it is appropriate that To drive upper stamp separately and to regulate their operation separately, while the Matrizenplatte is adjusted by one or more hydraulic cylinders.

Claims (4)

Pulverpresse zur Herstellung von Presslingen aus pulverförmigem Pressmaterial, mit den folgenden Merkmalen: eine Matrizenplatte (10) mit mindestens zwei Matrizen (12, 14) oder einer Matrize mit mindestens zwei Matrizenbohrungen mindestens zwei Oberstempel, die mit den Matrizen (12, 14) bzw. den Matrizenbohrungen zusammenwirken
Hydraulikzylinder (20) für die Oberstempel (16) mindestens zwei Unterstempel (22), die mit den Matrizen (12, 14) bzw. Matrizenbohrungen zusammenwirken
Hydraulikzylinder (24, 26) für die Unterstempel (22) mindestens ein Positionssensor (28) für die Oberstempel (16) und mindestens ein Positionssensor für die Unterstempel (22)
Kraftsensoren (30, 40, 42) für die einzelnen Hydraulikzylinder (20, 24, 26) und ein Regler (32) für den oder die Hydraulikzylinder (20) für die Oberstempel (16) und jeweils ein Regler (44, 46) für die Hydraulikzylinder (24, 26) für die Unterstempel (22). Powder press for the production of compacts of powdered pressed material, having the following features: a die plate (10) with at least two dies (12, 14) or a die with at least two die holes at least two upper punches, which interact with the dies (12, 14) and the die holes
Hydraulic cylinder (20) for the upper punches (16) at least two lower punches (22) which cooperate with the dies (12, 14) or die bores
Hydraulic cylinders (24, 26) for the lower punches (22) at least one position sensor (28) for the upper punches (16) and at least one position sensor for the lower punches (22)
Force sensors (30, 40, 42) for the individual hydraulic cylinders (20, 24, 26) and a regulator (32) for the hydraulic cylinder or cylinders (20) for the upper punches (16) and in each case a regulator (44, 46) for the hydraulic cylinders (24, 26) for the lower punches (22). Pulverpresse nach Anspruch 1, dadurch gekennzeichnet, daß die Oberstempel oder die Unterstempel mechanisch gekoppelt und mit einem Hydraulikzylinder verbunden sind und ein Positionssensor für die Ober- oder Unterstempel vorgesehen ist.Powder press according to Claim 1, characterized in that the upper punches or the lower punches are mechanically coupled and connected to a hydraulic cylinder and a position sensor for the upper or lower punches is provided. Pulverpresse nach Anspruch 1, dadurch gekennzeichnet, daß die Unterstempel stationär sind und die Matrizenplatte höhenbeweglich und mit mindestens einem Hydraulikzylinder verbunden ist. Powder press according to claim 1, characterized in that the lower punches are stationary and the die plate is vertically movable and connected to at least one hydraulic cylinder. Pulverpresse nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß bei separaten Hydraulikzylindern für die Ober- und/oder Unterstempel Ringzylinder mit Ringkolben vorgesehen sind.Powder press according to one of Claims 1 to 3, characterized in that ring cylinders with annular pistons are provided in the case of separate hydraulic cylinders for the upper and / or lower punches.
EP05001884A 2004-02-20 2005-01-29 Powder press Not-in-force EP1566231B1 (en)

Applications Claiming Priority (2)

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DE102004008322 2004-02-20
DE102004008322A DE102004008322B4 (en) 2004-02-20 2004-02-20 powder Press

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EP1566231B1 (en) 2010-09-08
DE102004008322A1 (en) 2005-09-08
ATE480351T1 (en) 2010-09-15
EP1566231A3 (en) 2007-01-03
DE102004008322B4 (en) 2008-11-27
US7351048B2 (en) 2008-04-01
DE502005010195D1 (en) 2010-10-21
US20050186300A1 (en) 2005-08-25

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