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EP1129802B2 - Process for controlling the pressing force for metal powder compression - Google Patents
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EP1129802B2 - Process for controlling the pressing force for metal powder compression - Google Patents

Process for controlling the pressing force for metal powder compression Download PDF

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Publication number
EP1129802B2
EP1129802B2 EP01104107A EP01104107A EP1129802B2 EP 1129802 B2 EP1129802 B2 EP 1129802B2 EP 01104107 A EP01104107 A EP 01104107A EP 01104107 A EP01104107 A EP 01104107A EP 1129802 B2 EP1129802 B2 EP 1129802B2
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EP
European Patent Office
Prior art keywords
ram
predetermined
compressive force
die
compact
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.)
Expired - Lifetime
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EP01104107A
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German (de)
French (fr)
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EP1129802B1 (en
EP1129802A3 (en
EP1129802A2 (en
Inventor
Jürgen Hinzpeter
Ulrich Zeuschner
Thomas Pannewitz
Ulf Hauschild
Klaus Peter Rüssmann
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Fette GmbH
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Fette GmbH
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    • 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
    • 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
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • 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 method for the production of pressed parts, in particular of cutting inserts made of hard metal, by pressing of metal powder and subsequent sintering of the compact according to claim 1.
  • z. B. for carbide inserts is the maintenance of a predetermined total height between the insert seat and at least one cutting edge having a predetermined distance from the insert seat.
  • EP-A-0 358 770 is a method for the production of pressed parts by pressing metal powder has become known, in which the stamp are driven to a pressing force end value. To operate the stamp an electric motor operated spindle drive is used.
  • the invention has for its object to provide a method for producing carbide inserts by pressing and sintering of the compact, in particular indexable inserts, which is simpler than the last-described known method and yet leads to excellent results.
  • the lower punch in this case occupies a filling position.
  • the lower punch is first moved to a slightly lower position, so that a slight oversupply is filled, after which then the lower punch occupies the final filling position and is stripped with the help of the filling shoe ejected from the die bore rest.
  • upper punch and lower punch are moved to a predetermined first or second position, with a certain compressive force can already be applied.
  • the position of the upper punch at the approached first position corresponds to the upper edge of the compact.
  • a further adjustment of the lower punch only. In this adjustment, the pressing forces are continuously measured, the feed movement from the lower punch along a predetermined setpoint curve for the pressing force over time and is terminated when the pressing force has reached a predetermined maximum value.
  • the predetermined maximum value for the pressing force is determined by previous attempts. First of all, it is determined which compression the metal powder is to receive, in order then to be exposed to the sintering process. Then it is examined how large the filling amount must be so that when applying a predetermined pressing force a certain height of the compact is reproducibly achieved. Becomes therefore switched off in the inventive method at a predetermined pressing force, then it can be assumed that the predetermined height of the compact has been achieved. In this way, a given density of the compact is achieved even with certain Greschwankept. Since filling fluctuations of the compact are not completely ruled out, it is preferable to proceed in such a way that given existing tolerances in case of doubt, there is a certain degree of oversight when switching off for a given pressing force value. If excessive, the compact is processed, preferably by grinding, to bring it to the predetermined height or thickness.
  • a die 10 is shown, whose bore has a mold cavity 12, which is conical in cross-section. With the aid of such a mold cavity 12, a compact can be produced, which is used as an insert, for example, a clearance angle insert.
  • the upper edge of the mold cavity 12 from the upper edge of the die 12 has a distance x.
  • an upper punch 14 and below the die 10, a lower punch 16 is indicated.
  • the punches 14, 16 are suitably operated by hydraulic cylinders. These are so controllable (not shown) that they apply a desired force. In addition, they can be speed controlled to produce a desired force-time curve.
  • the lower punch 16 When filling the die bore, the lower punch 16 has a predetermined filling position. Its position determines the filling quantity.
  • the lower punch 16 is moved into the die bore, wherein the upper punch 14 so far hineinafter that it comes to rest on the top of the mold cavity 12.
  • the entry depth into the die bore thus corresponds to the dimension x.
  • the lower punch 16 is also moved to a predetermined position, such as in Fig. 2 is shown. This is already an injection process. Subsequently, the lower punch 16 is moved further until a predetermined pressing force has been reached.
  • the pressing force is such that, for a given filling quantity, the height of the compact to be formed (not shown) corresponds to the desired height. If the desired height or thickness has not yet been reached, it is necessary after sintering to edit the plate thus formed to the desired level, for. B. to grind. Therefore, care must be taken to avoid that a compact is formed with undersize in the method described.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Punching Or Piercing (AREA)
  • Coating Apparatus (AREA)

Abstract

Producing pressed parts comprises pouring a predetermined amount of metal powder into a matrix bore (12) of a press; adjusting lower (16) and upper stamps (14) of the press in a predetermined first and/or second position; further adjusting the lower stamp and optionally the upper stamp and simultaneously measuring pressing force of the lower stamp; and stopping the adjusting movement of the lower stamp and optionally the upper stamp when a predetermined value for the pressing force is reached.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von Preßteilen, insbesondere von Schneidplatten aus Hartmetall, durch Pressen von Metallpulver und anschliessendes Sintern des Preßlings nach dem Patentanspruch 1.The invention relates to a method for the production of pressed parts, in particular of cutting inserts made of hard metal, by pressing of metal powder and subsequent sintering of the compact according to claim 1.

Es ist bekannt, Formteile aus Hartmetall, Keramik, Sintermetall oder dergleichen mit Hilfe von Pressen herzustellen. Das pulverförmige bzw. granuläre Material ist so bereit zu stellen, daß bei einem angewandten Preßdruck der Preßling eine homogene Struktur bekommt und sich sintern läßt. Eine übliche Formgebung ist das sogenannte Direktpressen in entsprechend ausgeführten Preßformen oder Matrizen, denen ein Ober- und Unterstempel zugeordnet sind. Entsprechend dem jeweiligen Preßdruck ergibt sich beim Preßling eine unterschiedliche Dichte. Preßlinge mit geringerer Dichte schwinden beim Sintern jedoch stärker als Preßlinge mit höherer Dichte. Durch unterschiedlich einstellbare Preßwege für Ober- und Unterstempel wird versucht, Dichteabweichungen zu minimieren. Andererseits können unterschiedliche Dichten in der Praxis durch unterschiedliche Preßkräfte entstehen, die wiederum bei gleicher Höhe der Preßlinge, z. B. durch Füllschwankungen, die bis zu einigen Prozenten gehen, hervorgerufen werden. Erschwerend bei der Herstellung von Preßlingen, z. B. für Hartmetallschneidplatten, ist das Einhalten einer vorgegebenen Gesamthöhe zwischen Plattensitz und mindestens einer Schneidkante, die einen vorgegebenen Abstand zum Plattensitz aufweist.It is known to produce molded parts made of hard metal, ceramic, sintered metal or the like by means of presses. The powdery or granular material is to be provided so that at an applied pressing pressure of the compact gets a homogeneous structure and can be sintered. A common shape is the so-called direct pressing in correspondingly executed molds or dies, which are associated with an upper and lower punch. Depending on the particular pressing pressure results in the compact a different density. However, lower density compacts shrink more strongly in sintering than higher density compacts. By differently adjustable pressing paths for upper and lower punch is trying to minimize density deviations. On the other hand, different densities can arise in practice by different pressing forces, which in turn at the same height of the compacts, z. B. caused by filling fluctuations that go up to a few percent. To make matters worse in the production of compacts, z. B. for carbide inserts, is the maintenance of a predetermined total height between the insert seat and at least one cutting edge having a predetermined distance from the insert seat.

Aus DE 42 09 787 ist bekannt geworden, eine möglichst gleichmäßige Dichte z. B. innerhalb einer Charge zu erreichen, indem die Preßkraft gemessen und anschließend eine Korrektur über die Füllung für die nachfolgenden Preßlinge vorgenommen wird.Out DE 42 09 787 has become known, as uniform as possible density z. B. within a batch by measuring the pressing force and then made a correction on the filling for the subsequent compacts.

Aus DE 197 17 217 ist ferner bekannt geworden, abhängig von der Geometrie des Preßlings und des Ausgangsmaterials während der Kompression für einen Preßstempel ein gewünschtes Kraft-Weg-Diagramm (Sollkurve) zu ermitteln und zu speichern. Mittels 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, um am Ende der Kompressionsphase eine gleiche Dichte jedes Preßlings zu erhalten. Ein derartiges Verfahren ist jedoch nur anwendbar bei Preßlingen, bei welchen die Fläche des Preßlings im mittleren Bereich unkritisch ist. Dies gilt z. B. für die Sitzfläche einer Schneidplatte, bei der es ausreicht, wenn z. B. ein umlaufender Rand einen präzisen Abstand von der Schneidkante hat, während der mittlere Bereich mehr oder weniger vertieft sein kann.Out DE 197 17 217 It has also become known, depending on the geometry of the compact and the starting material during the compression for a ram to determine a desired force-displacement diagram (target curve) and store. By means of a separately actuated portion of the ram or a separate punch, the pressure on the pressing material during the compression phase is increased or decreased as soon as a deviation from the nominal curve is determined in order to obtain an equal density of each compact at the end of the compression phase. However, such a method is only applicable to compacts in which the area of the compact in the central region is not critical. This applies z. B. for the seat of a cutting plate, where it is sufficient if z. B. a circumferential edge has a precise distance from the cutting edge, while the central region can be more or less recessed.

Aus US-A-4 000 231 ist ein Verfahren zur Herstellung von Preßteilen durch Pressen von Metallpulver und anschließendes Sintern bekannt geworden, bei dem nach Beendigung des Preßvorgangs noch eine bestimmte Belastung des Preßlings vorgenommen wird, die nach und nach beendet wird, indem der Oberstempel in die obere Totpunktlage gefahren wird, während der Unterstempel den Preßling ausschiebt. Auf diese Weise wird versucht, die Bildung von Rissen im Preßling zu verhindern.Out US-A-4 000 231 a method for the production of pressed parts by pressing of metal powder and subsequent sintering has become known in which after completion of the pressing process still a certain load of the compact is made, which is gradually terminated by the upper punch is moved to the top dead center, while the lower punch pushes out the compact. In this way, an attempt is made to prevent the formation of cracks in the compact.

Aus EP-A-0 358 770 ist ein Verfahren zur Herstellung von Preßteilen durch Pressen von Metallpulver bekannt geworden, bei dem die Stempel auf einen Preßkraft-Endwert gefahren werden. Zur Betätigung der Stempel wird ein elektromotorisch betriebener Spindelantrieb verwendet.Out EP-A-0 358 770 is a method for the production of pressed parts by pressing metal powder has become known, in which the stamp are driven to a pressing force end value. To operate the stamp an electric motor operated spindle drive is used.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung von Schneidplatten aus Hartmetall durch Pressen und Sintern des Preßlings, insbesondere von Wendeschneidplatten, zu schaffen, das einfacher als das zuletzt beschriebene bekannte Verfahren ist und gleichwohl zu hervorragenden Ergebnissen führt.The invention has for its object to provide a method for producing carbide inserts by pressing and sintering of the compact, in particular indexable inserts, which is simpler than the last-described known method and yet leads to excellent results.

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

Wie beim herkömmlichen Verfahren wird auch bei der Erfindung zunächst eine vorgegebene Menge an Metallpulver in die Matrizenbohrung eingefüllt, wobei der Unterstempel hierbei eine Einfüllposition einnimmt. Gegebenenfalls wird der Unterstempel zunächst in eine etwas tiefere Position verfahren, so daß eine geringfügige Übermenge eingefüllt wird, wonach dann der Unterstempel die endgültige Einfüllposition einnimmt und mit Hilfe des Füllschuhs der aus der Matrizenbohrung ausgestoßene Rest abgestreift wird. Anschließend werden von Hydraulikzylindern angetriebene Oberstempel und Unterstempel in eine vorgegebene erste bzw. zweite Position verfahren, wobei bereits eine gewisse Preßkraft aufgebracht werden kann. Die Lage des Oberstempels bei der angefahrenen ersten Position entspricht der Oberkante des Preßlings. Anschließend erfolgt ein weiteres Verstellen nur des Unterstempels. Bei diesem Verstellvorgang werden die Preßkräfte fortlaufend gemessen, wobei die Zustellbewegung vom Unterstempel entlang einer vorgegebenen Sollkurve für die Preßkraft über der Zeit erfolgt und beendet wird, wenn die Preßkraft einen vorgegebenen maximalen Wert erreicht hat.As in the conventional method, a predetermined amount of metal powder is first filled in the die bore in the invention, the lower punch in this case occupies a filling position. Optionally, the lower punch is first moved to a slightly lower position, so that a slight oversupply is filled, after which then the lower punch occupies the final filling position and is stripped with the help of the filling shoe ejected from the die bore rest. Subsequently, driven by hydraulic cylinders upper punch and lower punch are moved to a predetermined first or second position, with a certain compressive force can already be applied. The position of the upper punch at the approached first position corresponds to the upper edge of the compact. Subsequently, a further adjustment of the lower punch only. In this adjustment, the pressing forces are continuously measured, the feed movement from the lower punch along a predetermined setpoint curve for the pressing force over time and is terminated when the pressing force has reached a predetermined maximum value.

Der vorgegebene maximale Wert für die Preßkraft wird durch vorangehende Versuche ermittelt. Zunächst einmal wird ermittelt, welche Verdichtung das Metallpulver erhalten soll, um anschließend dem Sinterungsprozeß ausgesetzt zu werden. Dann wird untersucht, wie groß die Füllmenge sein muß, damit beim Aufbringen einer vorgegebenen Preßkraft eine bestimmte Höhe des Preßlings reproduzierbar erreicht wird. Wird daher bei dem erfindungsgemäßen Verfahren bei einer vorgegebenen Preßkraft abgeschaltet, dann kann davon ausgegangen werden, daß die vorgegebene Höhe des Preßlings erreicht worden ist. Auf diese Weise wird auch bei gewissen Füllschwankungen eine vorgegebene Dichte des Preßlings erreicht. Da Füllschwankungen des Preßlings nicht gänzlich auszuschließen sind, wird vorzugsweise so verfahren, daß bei vorhandenen Toleranzen im Zweifel ein gewisses Übermaß vorliegt, wenn bei vorgegebenem Preßkraftwert abgeschaltet wird. Bei Übermaß wird der Preßling abgearbeitet, vorzugsweise durch Schleifen, um ihn auf die vorgegebene Höhe bzw. Dicke zu bringen.The predetermined maximum value for the pressing force is determined by previous attempts. First of all, it is determined which compression the metal powder is to receive, in order then to be exposed to the sintering process. Then it is examined how large the filling amount must be so that when applying a predetermined pressing force a certain height of the compact is reproducibly achieved. Becomes therefore switched off in the inventive method at a predetermined pressing force, then it can be assumed that the predetermined height of the compact has been achieved. In this way, a given density of the compact is achieved even with certain Füllschwankungen. Since filling fluctuations of the compact are not completely ruled out, it is preferable to proceed in such a way that given existing tolerances in case of doubt, there is a certain degree of oversight when switching off for a given pressing force value. If excessive, the compact is processed, preferably by grinding, to bring it to the predetermined height or thickness.

Auf diese Weise ist es möglich, sich den endgültigen erwünschten Preßkraftwerten auf regelnde Weise anzunähern.In this way, it is possible to approach the final desired pressing force values in an orderly manner.

Während bei bekannten Verfahren zwar auch die Preßkraft gemessen, beim Anfahren einer vorgegebenen Position, um anschließend bei Preßkraftabweichungen die Füllmenge zu verändern, erfolgt bei der Erfindung eine unmittelbare Korrektur am Preßling.While in known methods, although the pressing force measured when starting a predetermined position, and then to change the filling amount in Preßkraftabweichungen, carried out in the invention, an immediate correction of the compact.

Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.

Fig. 1
zeigt eine Presse zum Verpressen von Metallpulver nach dem erfindungsgemäßen Verfahren und von dem eigentlichen Preßvorgang.
Fig. 2
zeigt die Presse nach Fig. 1 während des Preßvorgangs.
The invention will be explained in more detail with reference to drawings.
Fig. 1
shows a press for pressing metal powder according to the inventive method and the actual pressing.
Fig. 2
shows the press Fig. 1 during the pressing process.

In den Figuren 1 und 2 ist eine Matrize 10 dargestellt, deren Bohrung einen Formhohlraum 12 aufweist, welcher im Querschnitt konisch ist. Mit Hilfe eines derartigen Formhohlraums 12 kann ein Preßling erzeugt werden, der als eine Schneidplatte, beispielsweise eine Wendeschneidplatte mit Freiwinkel verwendet wird. Die Oberkante des Formhohlraums 12 von der Oberkante der Matrize 12 hat einen Abstand x. Oberhalb der Matrize 12 ist ein Oberstempel 14 und unterhalb der Matrize 10 ein Unterstempel 16 angedeutet. Die Stempel 14, 16 werden in geeigneter Weise von Hydraulikzylindern betätigt. Diese sind so steuerbar (nicht gezeigt), daß sie eine gewünschte Kraft aufbringen. Außerdem können sie in ihrer Geschwindigkeit gesteuert werden, um eine gewünschte Kraft-Zeit-Kurve zu erzeugen. Bei der Befüllung der Matrizenbohrung hat der Unterstempel 16 eine vorgegebene Füllposition. Seine Position bestimmt die Füllmenge. Vorzugsweise ist sie zu Beginn etwas niedriger als die theoretische Füllposition für die vorgegebene Menge, damit nach dem Befüllen der Unterstempel eine gewisse Strecke nach oben fahren und der nicht gezeigte Füllschuh überschüssiges Material an der Matrizenoberseite abstreifen kann. Anschließend werden Oberstempel 14 und Unterstempel 16 in die Matrizenbohrung hineingefahren, wobei der Oberstempel 14 soweit hineinfährt, daß er an der Oberseite des Formhohlraums 12 zu liegen kommt. Die Einfahrtiefe in die Matrizenbohrung entspricht mithin dem Maß x. Der Unterstempel 16 wird ebenfalls auf eine vorgegebene Position verfahren, wie sie etwa in Fig. 2 dargestellt ist. Hierbei findet bereits ein Verpreßvorgang statt. Anschließend wird der Unterstempel 16 weiter verfahren, bis eine vorgegebene Preßkraft erreicht worden ist. Die Preßkraft ist so bemessen, daß bei einer vorgegebenen Füllmenge die Höhe des zu formenden Preßlings (nicht gezeigt) der Sollhöhe entspricht. Ist die Sollhöhe oder Solldicke noch nicht erreicht worden, ist es nach dem Sintern erforderlich, die so geformte Platte auf das gewünschte Maß zu bearbeiten, z. B. zu schleifen. Daher ist dafür zu sorgen, daß bei dem beschriebenen Verfahren vermieden wird, daß ein Preßling mit Untermaß geformt wird.In the Figures 1 and 2 a die 10 is shown, whose bore has a mold cavity 12, which is conical in cross-section. With the aid of such a mold cavity 12, a compact can be produced, which is used as an insert, for example, a clearance angle insert. The upper edge of the mold cavity 12 from the upper edge of the die 12 has a distance x. Above the die 12, an upper punch 14 and below the die 10, a lower punch 16 is indicated. The punches 14, 16 are suitably operated by hydraulic cylinders. These are so controllable (not shown) that they apply a desired force. In addition, they can be speed controlled to produce a desired force-time curve. When filling the die bore, the lower punch 16 has a predetermined filling position. Its position determines the filling quantity. Preferably, it is at the beginning slightly lower than the theoretical filling position for the predetermined amount, so after filling the lower punch a certain distance go up and the filling shoe, not shown, can strip off excess material on the upper side of the die. Subsequently, upper punch 14 and lower punch 16 are moved into the die bore, wherein the upper punch 14 so far hineinfährt that it comes to rest on the top of the mold cavity 12. The entry depth into the die bore thus corresponds to the dimension x. The lower punch 16 is also moved to a predetermined position, such as in Fig. 2 is shown. This is already an injection process. Subsequently, the lower punch 16 is moved further until a predetermined pressing force has been reached. The pressing force is such that, for a given filling quantity, the height of the compact to be formed (not shown) corresponds to the desired height. If the desired height or thickness has not yet been reached, it is necessary after sintering to edit the plate thus formed to the desired level, for. B. to grind. Therefore, care must be taken to avoid that a compact is formed with undersize in the method described.

Es wird jedoch nicht nur ein vorgegebener maximaler Preßkraft-Endwert gefahren, sondern der Unterstempel 16 wird nach einer vorgegebenen Sollkurve gefahren, nämlich für die Preßkraft über der Zeit, bis der gewünschte maximale PreßkraftWert erreicht worden ist. Auf diese Weise wird die gewünschte Reproduzierbarkeit für die Preßkraft bzw. die Dichte des Preßlings erreicht. Ein Ziel ist bekanntlich, eine reproduzierbare Dichte des Preßlings zu erreichen, damit beim Sintern reproduzierbare geometrische Abmessungen erhalten werden.However, not only a predetermined maximum pressing force end value is driven, but the lower punch 16 is driven according to a predetermined setpoint curve, namely for the pressing force over time, until the desired maximum PreßkraftWert has been achieved. In this way, the desired reproducibility for the pressing force or the density of the compact is achieved. A goal is known to achieve a reproducible density of the compact so that reproducible geometric dimensions are obtained during sintering.

Claims (1)

  1. A process for the manufacture of cemented-carbide reversible cutting blade inserts with a clearance angle by compacting metallic powder and subsequently sintering the compact, the reversible cutting blade inserts having a seating surface and at least one cutting edge extending approximately in parallel with the seating surface and at a predetermined distance from the seating surface, by means of a press having a die-plate and a top ram and a bottom ram, wherein the rams are driven by hydraulic cylinders, comprising the steps of:
    - Charging a predetermined volume of metallic powder into the die-plate bore with the bottom ram taking a predetermined charging position in the die-plate bore and the upper ram being located above the die-plate bore,
    - Displacing the top ram to a first predetermined position corresponding to the upper edge of the compact and the bottom ram to a second predetermined position, wherein only the bottom ram is subsequently displaced,
    - Subsequent further displacing the bottom ram towards the top ram while simultaneously measuring the compressive force of the bottom ram, with the shift of the bottom ram being effected along a predetermined, desired compressive force-versus-time curve for approaching final compressive force values in a regulating way,
    - Terminating the feed motion of the bottom ram when a predetermined value is reached for the compressive force, wherein only the bottom ram is displaced starting from the second position up to a predetermined value of the compressive force and along the desired compressive force-versus-time curve, until the desired value of the compressive force is reached.
EP01104107A 2000-03-04 2001-02-21 Process for controlling the pressing force for metal powder compression Expired - Lifetime EP1129802B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10010671 2000-03-04
DE10010671A DE10010671C2 (en) 2000-03-04 2000-03-04 Process for producing pressed parts by pressing metal powder and then sintering the compact

Publications (4)

Publication Number Publication Date
EP1129802A2 EP1129802A2 (en) 2001-09-05
EP1129802A3 EP1129802A3 (en) 2004-05-06
EP1129802B1 EP1129802B1 (en) 2007-03-14
EP1129802B2 true EP1129802B2 (en) 2010-08-11

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US (1) US6562291B2 (en)
EP (1) EP1129802B2 (en)
AT (1) ATE356681T1 (en)
DE (2) DE10010671C2 (en)

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WO2018210448A2 (en) 2017-05-18 2018-11-22 Cosateq Gmbh Method for operating a powder press having an attitude control and powder press for carrying out the method
DE102017119342A1 (en) 2017-08-24 2019-02-28 COSATEQ GmbH & Co. KG Method for controlling a metal or ceramic powder press with automatic trajectory generation

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DE102017004803A1 (en) 2017-05-18 2018-11-22 Cosateq Gmbh Method for operating a powder press with layer control and powder press for carrying out the method
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DE10010671A1 (en) 2001-09-13
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US20010022944A1 (en) 2001-09-20
DE10010671C2 (en) 2002-03-14
EP1129802A3 (en) 2004-05-06
EP1129802A2 (en) 2001-09-05
US6562291B2 (en) 2003-05-13
ATE356681T1 (en) 2007-04-15

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