EP0873855B1 - Procédé et dispositif pour la fabrication pièces moulées en métal dur, céramique, métal fritté ou similaire - Google Patents

Procédé et dispositif pour la fabrication pièces moulées en métal dur, céramique, métal fritté ou similaire Download PDF

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Publication number
EP0873855B1
EP0873855B1 EP98103085A EP98103085A EP0873855B1 EP 0873855 B1 EP0873855 B1 EP 0873855B1 EP 98103085 A EP98103085 A EP 98103085A EP 98103085 A EP98103085 A EP 98103085A EP 0873855 B1 EP0873855 B1 EP 0873855B1
Authority
EP
European Patent Office
Prior art keywords
ram
pressing
force
punch
die
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
Application number
EP98103085A
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German (de)
English (en)
Other versions
EP0873855A3 (fr
EP0873855A2 (fr
Inventor
Jürgen Hinzpeter
Ingo Schmidt
Ulrich Gathmann
Jörg Reitberger
Klaus-Peter Preuss
Alexander Oldenburg
Joachim Greve
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fette GmbH
Original Assignee
Fette GmbH
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Filing date
Publication date
Application filed by Fette GmbH filed Critical Fette GmbH
Publication of EP0873855A2 publication Critical patent/EP0873855A2/fr
Publication of EP0873855A3 publication Critical patent/EP0873855A3/fr
Application granted granted Critical
Publication of EP0873855B1 publication Critical patent/EP0873855B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • B30B11/04—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 co-operating with a fixed mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/22—Control arrangements for fluid-driven presses controlling the degree of pressure applied by the ram during the pressing stroke
    • 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 compacts of hard metal, ceramic, sintered metal or the like according to the preamble of patent claim 1.
  • tungsten carbide cutting plates are also to comply with the criteria immersion depth of the upper punch until the beginning of the cutting clearance angle in the die to obtain a sharp cutting edge. Furthermore, the overall height of the compact is to be kept precisely.
  • the invention is based on the object, a method for the production of compacts of hard metal, ceramic, sintered metal or the like, in which a correction to the compact can already be made during the pressing process.
  • At least two position sensors are provided, namely for the at least one ram and the at least one further ram 1 or a portion of the ram, which give their measurements each on a control computer.
  • a force sensor is associated with the ram or a portion of the ram. Also its values are given in the control computer.
  • the position sensors are intended to ensure that, for example, in the case of an upper punch and a lower punch, they move to a predetermined position in the die in order to produce the predetermined geometry of the compact and its dimensions observed. Due to different filling, however, density fluctuations can arise, which must be avoided. Therefore, the invention provides a further ram or a Preßstempelabites which is actuated by the control computer, if a deviation from the desired density value is determined during the respective pressing operation.
  • a specific force-displacement diagram is determined by pressing tests for each mold or the starting material.
  • the sensors measure values for the respective force and the respective path that are given to the control computer, which uses this to determine and buffer a force-displacement curve.
  • the optimal force-displacement curve can be determined, which is then finally stored as a setpoint curve in the control computer. It is understood that subsequent changes to the curve at any time in the computer are possible.
  • the control computer now carries out in the compression phase for each compact a setpoint-actual value comparison of the measured force and displacement values with the setpoint curve by.
  • the regulation begins and by pressing the further punch or a stamp section, the force component applied by the associated drive is increased or reduced, ie the corresponding punch section is moved forward or backward relative to the other punch or counter surface. In this way, the density of the compact is optimized, while the dimensional accuracy of the compact is achieved by adhering to the stamp paths.
  • either the upper or the lower punch of a press is expediently subdivided into coaxial sections, wherein the inner or the outer punch is used for the optimization of the density, depending on which surface of the compact it is uncritical, which distance it has, for example, to the opposite surface.
  • the inner lower punch is expediently used for density optimization since the outer bottom surface of the insert must assume a precise distance from the upper side of the insert or the cutting edge. This outer, for example, annular bottom surface then forms the seat when clamping the insert.
  • the inner surface which in contrast forms the bottom of a corresponding recess, may have within limits any distance from the cutting edges.
  • a tool 10 of a press is shown with a die 12, an upper punch 14, a lower punch 16, which is composed of an outer punch 18 and a coaxially arranged inner punch 20.
  • the punches 14, 18 and 20 are of a separate drive, For example, a hydraulic cylinder, driven (see later Fig. 4).
  • a mandrel 22 is telescopically guided, which dips into a corresponding, for example, central bore 24 of the upper punch 14.
  • the cutting edge can be seen at 28. It is formed by the fact that the upper punch 14 dips into the bore of the die 12 over a predetermined distance (immersion depth). Underneath, the die bore has a conical section for forming the clearance angle.
  • the total height of the compact 26 is designated h. It is determined by the depth of immersion of the upper punch 14 and the depth of insertion of the outer punch 18. In order to obtain a sharp cutting edge 28, it is necessary to strictly adhere to the depth of insertion of the upper punch 14, i. The upper punch 14 must dive exactly into the die 12 until the beginning of the clearance angle (point 28).
  • FIG. 2a movement phases in the production of the compact 26 are shown.
  • the lower dies 18, 20 close the mold cavity 30 of the die 12 on the underside, wherein the mandrel 22 is up to the top the die 12 extends.
  • the upper punch 14 is located above the die 12 in order to be able to fill the powdery starting material into the mold cavity 30.
  • lower and upper punches are moved towards each other, as shown in Fig. 2b.
  • two inner and outer punches 20, 18 are moved together, but not synchronously, but the inner punch 20 is moved by a certain amount further than the outer punch 18. This is in comparison to Fig. 2c reinforced, which roughly the state as shown in Fig. 1.
  • the compact 26 is completed.
  • Fig. 2d the upper punch 14 has returned to the starting position, and the lower punch 18, 20 eject the compact 26 from the die 12 from.
  • the punches 14, 18, 20 are shown schematically omitting the die 12. It can be seen that they are connected to the pistons of hydraulic cylinders 32, 34 and 36, respectively. With the aid of a sensor 38 and 40, the pressing forces of the cylinders 32 and 36 are measured. The output signals of the sensors 38, 40 go into a control computer 42. The punches 14, 18 and 20 are each assigned a position sensor 44, 48 and 46, whose output signals also enter the control computer 42. With the help of the sensors 38, 40 are the stamps 14, 18 monitored forces monitored. With the help of the sensors 44, 46 and 48, the paths of the punches 14, 20 and 18 are monitored.
  • FIG. 2 shows that it is necessary that upper punch 14 and outer punch 18 each have to cover a predetermined distance to ensure the accuracy of the compact 26. It is also crucial for the quality of the compact 26 that it reproducibly has the same density. This could vary with eg non-uniform bulk volume of the charge of the starting material 32.
  • suitable compression tests can now determine a certain course of the force-displacement curve for a given geometry of a compact and the selected starting material, which is optimal for a particular compact.
  • Such a desired curve 50 is shown in FIG. 3 in a continuous line. It corresponds, for example, to the force-displacement curve with respect to the upper punch 14.
  • Such a setpoint curve 50 is stored in the control computer 42.
  • the punches 14 and 18 are now controlled so that they cover the respective immersion depth until reaching a precise end position.
  • the pressing force is known to be an indication of whether the desired density of the material to be pressed at the respective position of the punch is reached.
  • the forces and thus the deviations are measured with the associated force sensor 38 or 40. They are indicated by dashed lines in Fig. 3 at 52. When such a deviation occurs, the inner punch 20 is moved over its respective cylinder 34, either toward or away from the upper punch 14, depending on whether an increase in force or a reduction in force is required.
  • an additional ram may be provided, e.g. is guided radially to the bore of the die 12 to make there a desired increase or decrease in compression.
  • the control computer 42 is controlled via an operating computer 56, which, however, is not important for the described function of the regulation of a press.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Control Of Presses (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Ceramic Products (AREA)
  • Punching Or Piercing (AREA)

Claims (3)

  1. Procédé de fabrication d'objets moulés en métal dur, céramique, métal fritté ou en un matériau semblable, dans lequel une partie d'une charge d'un matériau initial en poudre ou en granulés est versée dans un moule et comprimée avec au moins un poinçon de pressage contre une surface, la force et la course du poinçon étant mesurés, caractérisé par les étapes suivantes :
    - en fonction de la géométrie et du matériau initial, on recherche et on enregistre un diagramme force-course (courbe de consigne) pour un objet moulé par des essais de pressage durant la phase de compression en mesurant la course du poinçon et sa force de compression,
    - dans un calculateur (42), les valeurs mesurées de la course et de la force du poinçon de pressage (14,18,20) sont comparées avec la courbe de consigne au cours de la production,
    - au moyen d'au moins une partie actionnée séparément du poinçon de pressage ou d'un poinçon séparé (22), on augmente ou on diminue la pression sur le matériau comprimé durant la phase de compression dès qu'on détecte un écart vis à vis de la courbe de consigne, afin d'obtenir à la fin de la phase de compression une densité identique de chaque objet moulé (26).
  2. Dispositif d'exécution du procédé selon la revendication 1,
    pourvu d'un outil de pressage (10) comportant une matrice (12) et au moins un poinçon de pressage (14) sur un côté de la matrice (12) et au moins un poinçon (18) ou une surface antagoniste sur le côté opposé de la matrice pour comprimer le matériau (32a) versé dans la matrice (12), dans lequel les poinçons de pressage sont actionnables par un mécanisme d'actionnement de poinçon (32,34,36) et au moins un poinçon de pressage est constitué de deux parties disposées l'une à côté de l'autre (18,20), le poinçon intérieur et le poinçon extérieur, chacun des deux ayant un mécanisme d'actionnement,
    et doté d'un capteur de position (44, 46, 48) pour chaque poinçon (14,20,18), d'un capteur de force (38 ,40) pour au moins un poinçon de pressage (14,18), et d'un calculateur de commande (42),
    caractérisé en ce que dans le calculateur de commande, un diagramme course-pression alloué pour la compression d'un objet moulé constitué d'un matériau prédéfini et ayant une géométrie prédéfinie est enregistré pour au moins un poinçon (14) et dans lequel les valeurs mesurées par les capteurs (38, 40, 44, 46, 48) sont entrées pour régler l'actionnement du poinçon de pressage en fonction du diagramme force-course.
  3. Dispositif selon la revendication 2, caractérisé en ce que, lors de la mise en oeuvre d'un poinçon supérieur et inférieur, et d'une subdivision d'un poinçon en un poinçon extérieur et un poinçon intérieur, on alloue uniquement un capteur de position (46) au poinçon intérieur (20).
EP98103085A 1997-04-24 1998-02-21 Procédé et dispositif pour la fabrication pièces moulées en métal dur, céramique, métal fritté ou similaire Expired - Lifetime EP0873855B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19717217A DE19717217C2 (de) 1997-04-24 1997-04-24 Verfahren und Vorrichtung zur Herstellung von Preßlingen aus Hartmetall, Keramik, Sintermetall oder dergleichen
DE19717217 1997-04-24

Publications (3)

Publication Number Publication Date
EP0873855A2 EP0873855A2 (fr) 1998-10-28
EP0873855A3 EP0873855A3 (fr) 1999-01-13
EP0873855B1 true EP0873855B1 (fr) 2006-01-18

Family

ID=7827546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98103085A Expired - Lifetime EP0873855B1 (fr) 1997-04-24 1998-02-21 Procédé et dispositif pour la fabrication pièces moulées en métal dur, céramique, métal fritté ou similaire

Country Status (4)

Country Link
US (1) US6074584A (fr)
EP (1) EP0873855B1 (fr)
AT (1) ATE315997T1 (fr)
DE (2) DE19717217C2 (fr)

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DE19846210A1 (de) * 1998-10-07 2000-04-13 Dorst Masch & Anlagen Presse zum Herstellen von Formkörpern
DE19949868B4 (de) * 1999-10-15 2005-01-20 R & D Carbon Ltd. Verfahren zur Herstellung von Kohlekörpern
DE19955196A1 (de) * 1999-11-16 2001-05-23 Korsch Pressen Ag Verfahren zum Konstanthalten der Bruchhärte von Tabletten
DE10010671C2 (de) 2000-03-04 2002-03-14 Fette Wilhelm Gmbh Verfahren zur Herstellung von Preßteilen durch Pressen von Metallpulver und anschließendes Sintern des Preßlings
DE10135283C2 (de) * 2001-07-19 2003-09-18 Fette Wilhelm Gmbh Verfahren zum Verpressen von Pulvermaterial
DE10142772C2 (de) * 2001-08-31 2003-09-25 Fette Wilhelm Gmbh Verfahren zur Herstellung von Pressteilen in einer Pulverpresse
DE10142773C1 (de) * 2001-08-31 2003-03-06 Fette Wilhelm Gmbh Hydraulische Presse zum Pressen von Metallpulver
DE10142623C2 (de) 2001-08-31 2003-11-06 Fette Wilhelm Gmbh Verfahren und Vorrichtung zur Minimierung der Streuung der maximalen Presskräfte in einer Pulverpresse
DE10151858A1 (de) * 2001-10-24 2003-05-08 Dorst Masch & Anlagen Verfahren zum Einstellen bzw. Überwachen eines Pressen-Werkzeugs und Pressen-Werkzeug bzw. Pressen-Steuereinrichtung dafür
DE10254656B4 (de) 2002-11-22 2005-10-13 Dorst Technologies Gmbh & Co. Kg Presseneinrichtung zum Herstellen maßhaltiger Presslinge mit zentraler Stempelabstützung
DE10262091B4 (de) * 2002-12-03 2005-12-22 Röltgen GmbH & Co. KG Tablettierpresse
US7014453B2 (en) * 2002-12-17 2006-03-21 Lear Corporation Machine having sensors for controlling molding operation
DE10301224A1 (de) * 2003-01-15 2004-08-05 Maschinenfabrik Lauffer Gmbh & Co Kg Verfahren zur Endpositionsregelung einer Presse für maßgenaue Formkörper
DE102004008322B4 (de) 2004-02-20 2008-11-27 Fette Gmbh Pulverpresse
GB0702196D0 (en) * 2007-02-06 2007-03-14 3M Innovative Properties Co Device for producing a dental workpiece
EP1964664B1 (fr) 2007-02-27 2013-11-20 Maschinenfabrik Lauffer GmbH & Co. KG Procédé pour la commande d'une presse à poudre fabricant des pièces brutes
EP2123435B1 (fr) 2007-03-20 2016-03-09 Tungaloy Corporation Procédé de moulage par compression d'un insert de coupe
GB0719824D0 (en) * 2007-10-11 2007-11-21 3M Innovative Properties Co Dental blank and method of making a dental ceramic blank
US8415268B2 (en) * 2008-07-02 2013-04-09 Basf Se Process for producing a ringlike oxidic shaped body
DE102009004620A1 (de) * 2009-01-15 2010-07-22 Gkn Sinter Metals Holding Gmbh Verfahren zum Betrieb einer Pressvorrichtung zur Herstellung von Presslingen konstanter Höhe aus pulverförmigen Stoffen, Steuergerät für eine derartige Pressvorrichtung und Pressvorrichtung
DE102009016716A1 (de) * 2009-04-09 2010-10-21 Gkn Sinter Metals Holding Gmbh Magnetkupplung
IT1401473B1 (it) * 2010-07-15 2013-07-26 Rm Technology Engineering Di Maggioni Roberto Dispositivo di compressione di polveri e simili.
DE102012019312A1 (de) * 2012-10-01 2014-04-03 Dorst Technologies Gmbh & Co. Kg Verfahren zum Steuern einer Keramik- und/oder Metallpulver-Presse bzw. Keramik- und/oder Metallpulver-Presse
DE102016107362B4 (de) * 2016-04-20 2020-01-23 Federal-Mogul Bremsbelag Gmbh Pressen mindestens einer Pressmasse mittels mehrerer Pressstempel
EP3403817B1 (fr) * 2017-05-18 2024-04-03 Walter Ag Plaque de coupe et procédé pour réaliser un corps cru de la plaque de découpe
CH716048B1 (de) * 2019-04-09 2024-02-15 Dietmar Kramer Dr Sc Techn Eth Phd Verfahren sowie eine Messeinrichtung zum Ausmessen von Utensilien für Pressen.
DE102021206078A1 (de) 2021-06-15 2022-12-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Vorrichtung und Verfahren zum Einspannen plattenförmiger Bauteile

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US5476631A (en) * 1992-06-09 1995-12-19 Cincinnati Incorporated Method and apparatus for adaptive powder fill adjustment on powder metal compacting presses

Also Published As

Publication number Publication date
DE19717217A1 (de) 1998-10-29
DE59813346D1 (de) 2006-04-06
ATE315997T1 (de) 2006-02-15
EP0873855A3 (fr) 1999-01-13
DE19717217C2 (de) 1999-12-02
US6074584A (en) 2000-06-13
EP0873855A2 (fr) 1998-10-28

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