EP1129802B1 - Procédé pour controler la force de pressage pour la compression de poudre métallique - Google Patents

Procédé pour controler la force de pressage pour la compression de poudre métallique Download PDF

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Publication number
EP1129802B1
EP1129802B1 EP01104107A EP01104107A EP1129802B1 EP 1129802 B1 EP1129802 B1 EP 1129802B1 EP 01104107 A EP01104107 A EP 01104107A EP 01104107 A EP01104107 A EP 01104107A EP 1129802 B1 EP1129802 B1 EP 1129802B1
Authority
EP
European Patent Office
Prior art keywords
predetermined
ram
compressive force
die
pressing force
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
EP01104107A
Other languages
German (de)
English (en)
Other versions
EP1129802A3 (fr
EP1129802B2 (fr
EP1129802A2 (fr
Inventor
Jürgen Hinzpeter
Ulrich Zeuschner
Thomas Pannewitz
Ulf Hauschild
Klaus Peter Rüssmann
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
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Application filed by Fette GmbH filed Critical Fette GmbH
Publication of EP1129802A2 publication Critical patent/EP1129802A2/fr
Publication of EP1129802A3 publication Critical patent/EP1129802A3/fr
Publication of EP1129802B1 publication Critical patent/EP1129802B1/fr
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Publication of EP1129802B2 publication Critical patent/EP1129802B2/fr
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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
    • 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.
  • the invention has for its object to provide a method for producing carbide inserts by pressing and sintering of the compact, in particular of indexable inserts, which is simpler than the last described known method and nevertheless leads to excellent results.
  • the lower punch here assumes 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. If it is a compact, which is intended for a cutting plate with clearance angle, corresponds to the position of the upper punch at the approached second position z. B. the upper edge of the compact.
  • 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 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. If, 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 Greankept. 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 excess when switching off at 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 also moved to a predetermined position, as shown for example in Fig. 2. Here is already one Pressing process instead. 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.
  • FIG. 3 and 4 differs from that of Figures 1 and 2 only in that the bore of the die is cylindrical.
  • the cutting plate produced by means of the method therefore has no clearance angle.
  • the embodiment of Figures 3 and 4 are provided with the same reference numerals as Figure 1.
  • Line 20 in Fig. 5 indicates the die top edge.
  • the thick curve 22 indicates the position of a top punch, and the thick curve 24 that of a lower punch, for example, the punch 14, 16 after Figures 3 and 4.
  • the thick line 26 indicates the position of the Greschuhs.
  • the lower punch has the position a corresponding to the upper edge of the die and the upper punch is located clearly above the upper edge of the die.
  • the filling shoe is located above the die, and the lower punch moves into a first filling position b, during which a filling of the die bore with hard metal powder takes place, as indicated at 28.
  • the filling is finished at c.
  • the lower punch moves slightly up to the position d, which represents the final filling position, ie the column of powder in the die bore corresponds to the predetermined filling quantity. Any excess material above the upper edge of the die 20 is then stripped off the filling shoe.
  • the filling shoe then moves into its starting position, and the upper punch moves to the position P2, while the lower punch moves back slightly at the same time to prevent the upper punch presses powder material laterally out of the die bore.
  • the upper punch is moved to the position P3, wherein the lower punch still retains the previously assumed position. Now begins the pressing process, the position P4 of top and bottom punches over a predetermined path, which cover the punch, can be approached.
  • the pressing force is maintained, after P6 the upper punch is slightly raised to allow a certain relaxation of the compact. Subsequently, upper and lower punches are raised together until the upper punch has reached the upper edge of the die 10. After some time (position P9) then the upper punch is moved up and allows the lower punch to move the compact out of the die bore.

Landscapes

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

Claims (3)

  1. Procédé de fabrication d'éléments comprimés, en particulier de plaquettes de coupe en métal dur, par compression de poudre métallique suivie d'un frittage du comprimé, en particulier de plaquettes de coupe tournantes présentant une surface formant un siège et au moins un bord de coupe sensiblement parallèle à la surface formant le siège qui est disposé à une distance prédéterminée de la surface formant le siège, à l'aide d'une presse comportant une matrice ainsi qu'un poinçon supérieur et un poinçon inférieur, les poinçons étant actionnés à l'aide de vérins hydrauliques, ce procédé comprenant les étapes consistant à :
    - verser une quantité prédéterminée de poudre métallique dans l'alésage de la matrice, le poinçon inférieur présentant une position de remplissage prédéterminée dans l'alésage de la matrice et le poinçon supérieur se trouvant au-dessus de l'alésage de la matrice,
    - déplacer le poinçon supérieur dans l'alésage de la matrice dans une première position prédéterminée et déplacer le poinçon inférieur dans une deuxième position prédéterminée,
    - déplacer encore le poinçon inférieur jusqu'au poinçon supérieur et mesurer en même temps la force de compression du poinçon inférieur, le déplacement du poinçon inférieur étant effectué le long d'une courbe théorique prédéterminée pour la force de compression par rapport au temps et
    - terminer le mouvement d'avancée du poinçon inférieur lorsqu'une valeur maximale prédéterminée pour la force de compression a été atteinte.
  2. Procédé selon la revendication 1,
    caractérisé en ce que,
    dans le cas de plaquettes de coupe sans angles libres, le poinçon supérieur est déplacé à partir de la première position le long d'une courbe théorique pour la force de compression jusqu'à ce qu'une force de compression prédéterminée soit atteinte.
  3. Procédé selon la revendication 1,
    caractérisé en ce que,
    dans le cas de plaquettes de coupe avec des angles libres, seul le poinçon inférieur est déplacé à partir de la première position jusqu'à une valeur prédéterminée de la force de compression ou le long d'une courbe théorique pour la force de compression par rapport au temps, jusqu'à ce que la valeur prédéterminée pour la force de compression soit atteinte.
EP01104107A 2000-03-04 2001-02-21 Procédé pour controler la force de pressage pour la compression de poudre métallique Expired - Lifetime EP1129802B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10010671 2000-03-04
DE10010671A DE10010671C2 (de) 2000-03-04 2000-03-04 Verfahren zur Herstellung von Preßteilen durch Pressen von Metallpulver und anschließendes Sintern des Preßlings

Publications (4)

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

Family

ID=7633551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01104107A Expired - Lifetime EP1129802B2 (fr) 2000-03-04 2001-02-21 Procédé pour controler la force de pressage pour la compression de poudre métallique

Country Status (4)

Country Link
US (1) US6562291B2 (fr)
EP (1) EP1129802B2 (fr)
AT (1) ATE356681T1 (fr)
DE (2) DE10010671C2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE102004008322B4 (de) 2004-02-20 2008-11-27 Fette Gmbh Pulverpresse
WO2008114827A1 (fr) * 2007-03-20 2008-09-25 Tungaloy Corporation Procédé de moulage par compression de plaquette jetable
DE102010015016B4 (de) * 2009-04-24 2016-06-09 Sms Group Gmbh Pulverpresse
JP5032690B1 (ja) * 2011-07-27 2012-09-26 住友電気工業株式会社 圧粉成形体
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
HK1252361A1 (zh) * 2015-05-07 2019-05-24 Thermal Technology, Llc 包括受保护的相对冲头的压缩烧结装置
DE102017004803A1 (de) 2017-05-18 2018-11-22 Cosateq Gmbh Verfahren zum Betrieb einer Pulverpresse mit Lagenregelung und Pulverpresse zur Ausführung des Verfahrens
DE102017119342A1 (de) 2017-08-24 2019-02-28 COSATEQ GmbH & Co. KG Verfahren zur Steuerung einer Metall- oder Keramikpulverpresse mit automatischer Trajektorien-Generierung
WO2021126324A1 (fr) 2019-12-17 2021-06-24 Kennametal Inc. Techniques de fabrication additive et leurs applications
EP4079427A1 (fr) * 2021-04-22 2022-10-26 GKN Sinter Metals Engineering GmbH Procédé de détermination d'un paramétré d'une matière et outil de compression destiné à la fabrication d'un comprimé cru

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000231A (en) * 1974-09-16 1976-12-28 Hydramet American Inc. Method for compacting powders
DE2825253A1 (de) † 1978-06-08 1979-12-13 Nitrochemie Gmbh Hydraulische pulverpresse
SE460460B (sv) † 1983-07-01 1989-10-16 Convey Teknik Ab Foerfarande och anordning foer reglerad pressning av pulvermaterial
DE3715077A1 (de) † 1987-05-06 1988-12-01 Netzsch Maschinenfabrik Verfahren zum steuern einer presse
JP2519498B2 (ja) * 1988-01-16 1996-07-31 ファナック株式会社 電動式粉末成形機
DE3919821C2 (de) * 1989-06-15 1994-04-07 Mannesmann Ag Verfahren und Vorrichtung zum Herstellen von maßhaltigen Preßlingen
DE4209767C1 (fr) * 1992-03-23 1993-05-06 Mannesmann Ag, 4000 Duesseldorf, De
US5547360A (en) * 1994-03-17 1996-08-20 Tamagawa Machinery Co., Ltd. Powder molding press
DE19717217C2 (de) * 1997-04-24 1999-12-02 Fette Wilhelm Gmbh Verfahren und Vorrichtung zur Herstellung von Preßlingen aus Hartmetall, Keramik, Sintermetall oder dergleichen

Also Published As

Publication number Publication date
DE10010671A1 (de) 2001-09-13
DE50112176D1 (de) 2007-04-26
US20010022944A1 (en) 2001-09-20
DE10010671C2 (de) 2002-03-14
EP1129802A3 (fr) 2004-05-06
EP1129802B2 (fr) 2010-08-11
EP1129802A2 (fr) 2001-09-05
US6562291B2 (en) 2003-05-13
ATE356681T1 (de) 2007-04-15

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