EP0403040B1 - Procédé et dispositif pour fabriquer des articles pressés à dimensions exactes - Google Patents

Procédé et dispositif pour fabriquer des articles pressés à dimensions exactes Download PDF

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Publication number
EP0403040B1
EP0403040B1 EP90250140A EP90250140A EP0403040B1 EP 0403040 B1 EP0403040 B1 EP 0403040B1 EP 90250140 A EP90250140 A EP 90250140A EP 90250140 A EP90250140 A EP 90250140A EP 0403040 B1 EP0403040 B1 EP 0403040B1
Authority
EP
European Patent Office
Prior art keywords
pressing force
tolerance band
pressing
travel
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.)
Expired - Lifetime
Application number
EP90250140A
Other languages
German (de)
English (en)
Other versions
EP0403040A2 (fr
EP0403040A3 (fr
Inventor
Gerd Dr.-Ing. Hinzmann
Norbert Dipl.-Ing. Nies
Siegfried Radewahn
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT90250140T priority Critical patent/ATE96732T1/de
Publication of EP0403040A2 publication Critical patent/EP0403040A2/fr
Publication of EP0403040A3 publication Critical patent/EP0403040A3/fr
Application granted granted Critical
Publication of EP0403040B1 publication Critical patent/EP0403040B1/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
    • 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

Definitions

  • the invention relates to a method for producing dimensionally stable compacts from pulverulent compositions according to the preamble of claim 1 and an apparatus for performing this method.
  • DE 29 51 716 C2 discloses a method for pressing shaped articles with at least one step made of metal powder, with which shaped articles of constant height and density can be produced.
  • the course of the pressing force of the ram is measured depending on the path and stored and compared with predetermined path-dependent setpoints.
  • the height accuracy of the compacts is ensured by mechanical stops and the permanently adjustable stroke of the upper punch.
  • the constant density is made possible within certain accuracy limits by the fact that the filling volume of the mold is reduced in the next working cycle when the comparison of the pressing force has shown that the setpoint has been exceeded. If the value falls below the setpoint, the procedure is reversed.
  • the object of the invention is therefore to provide a method and a device for carrying it out which permits even tighter tolerances with regard to the shape accuracy of the compacts and at the same time further reduces the risk of rejects production.
  • the basis of the invention is the knowledge that the accuracy of the molded part of a compact made from a powder material does not depend solely on the fact that the upper and lower dies which shape the mold are brought into a position in which their pressing surfaces are at a relative distance from one another that of the one to be produced Correspond to compacts.
  • Each compact is in fact elastic to a certain extent, so it springs open after being molded out of the mold.
  • the size of this suspension depends on the density of the compact and thus indirectly on the applied pressing force. In principle, the larger the press force, the stronger the spring-up. However, the relationship between density and pressing force is not linear and depends on the powder material used. If, in the production of compacts of identical shape per se, the press punches are brought into exactly the same position in relation to one another in the press end position, it is therefore in no way ensured that two compacts of exactly the same size also result. If one uses a greater pressing force than the other due to the greater bulk density of the powder filling, different parts will result in any case because the springing after the molding has been formed must be different.
  • the invention has made use of this knowledge by providing that the spring deflection of the molded part is taken into account in the final determination of the end position of the press ram in the press end position.
  • the applied pressing force must be measured on the stamp in question and a spring travel must be determined at this point in accordance with the spring characteristic of the compact (for example, in the case of a stepped compact at every height step).
  • the greater the expected spring deflection the closer the pressing surfaces of opposing punches must be moved to each other.
  • the course of the pressing force depending on the travel path of at least one, in the extreme case of each punch, which is to produce a dimensionally accurate part of the compact is detected and compared with a path-dependent tolerance band.
  • a second path-dependent tolerance band of the pressing force can be provided for the press rams in question, when the latter leaves the control, a corresponding compensating change in the filling volume of the press mold is initiated in the next working cycle.
  • this second tolerance band is wider than the first and completely covers it. In this way, even greater changes in the bulk density of the powder filling can be compensated for in their effects on the compact geometry.
  • an even wider path-dependent tolerance band of the pressing force can be provided, the press of which is switched off when it is left. If the maximum permissible pressing force is exceeded, cold welding of punches, for example, may have been the cause, so that greater tool damage is avoided by stopping the press. Conversely, if the pressure drops below the minimum, the mold may have been filled insufficiently or not at all, for example due to a disturbance in the powder supply, so that even in such a case the press must be switched off in order to avoid damage to the mold.
  • the iron powder 2 filled into a die 1 is compressed with an upper punch 3 and a lower punch 4 until the distance between the upper punch 3 and the lower punch 4 corresponds to the height of the pressed part 2 to be produced.
  • This state is shown in Figure 1.
  • a pressing force results, to which a specific springing of the pressing part 2 can be assigned, which occurs when the pressing part 2 is exposed from the mold.
  • the curve of the pressing force as a function of the spring deflection has been determined in previous experiments for the iron powder used. As a rule, this curve can be linearized with sufficient approximation in the section relevant to the tolerance band.
  • the punches 3 and 4 are moved towards each other by the amount of this spring. With this procedure, after the pressing part 2 has been exposed, the springing that occurs exactly gives the height of the pressing part 2 that was required (FIG. 3).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Press Drives And Press Lines (AREA)

Claims (5)

  1. Procédé pour la réalisation de pièces pressées (2) à partir de matière poudreuse, en particulier de la poudre métallique, sur une presse, dans un moule comportant au moins un poinçon supérieur (3) et au moins un poinçon inférieur (4), dans lequel les poinçons de presse peuvent être amenés, en position extrême de pressage, dans des positions prescrites prédéfinies et, lors du pressage, l'allure de la force de pressage d'au moins l'un des poinçons (3,4) étant détectée de façon dépendant du déplacement et étant à chaque fois comparée à une bande de tolérance de la force de pressage, prédéfinie et dépendant du déplacement,
    caractérisé en ce que, lorsque la bande de tolérance est dépassée, la position prescrite du poinçon concerné (3,4) est modifiée, en position extrême de pressage, de sorte que la hauteur de la pièce pressée (2), en position extrême de pressage, est réduite d'une valeur qui correspond à la détente augmentée, liée à la force extrême de pressage plus élevée, de la pièce pressée (2), après son démoulage, et, lorsque la bande de tolérance n'est pas atteinte, on procède inversement.
  2. Procédé selon la revendication 1,
    caractérisé en ce que la modification de la valeur prescrite de la position extrême du poinçon de presse (3,4) est effectuée pendant le cycle de travail, dans lequel l'écartement de la force de pressage de sa valeur prescrite a été détecté.
  3. Procédé selon l'une des revendications 1 ou 2,
    caractérisé en ce qu'une deuxième bande de tolérance de la force de pressage, dépendant du déplacement, est définie, bande de tolérance qui recouvre entièrement la première bande de tolérance, en ce que, lorsque cette deuxième bande de tolérance est dépassée, une diminution du volume de remplissage du moule (1), dans le cycle de travail suivant, est effectuée, et en ce que, lorsque cette deuxième bande de tolérance n'est pas atteinte, on procède inversement.
  4. Procédé selon l'une des revendications 1 à 3,
    caractérisé en ce qu'une troisième bande de tolérance de la force de pressage, dépendant du déplacement, est définie, bande de tolérance qui recouvre entièrement la première bande de tolérance et le cas échéant la seconde bande de tolérance, et en ce que la presse est mise automatiquement à l'arrêt, dès que la force de pressage effective se trouve hors de la troisième bande de tolérance.
  5. Presse pour la mise en oeuvre du procédé spécifié sous la revendication 1 comportant au moins un poinçon supérieur (3) et un poinçon inférieur (4), desquels au moins un peut être déplacé relativement par rapport à l'autre par un moyen mécanique, au moins un dispositif de mesure pour déterminer la position des poinçons (3,4), au moins un dispositif de mesure pour déterminer, en dépendance du déplacement, la force de pressage d'au moins un des poinçons (3,4), et une commande électronique reliée aux dispositifs de mesure pour le déplacement des poinçons,
    caractérisée en ce que, dans la commande électronique, des valeurs de correction pour la position des poinçons, dans la position extrême de pressage, peuvent être déterminées ou être calculées à partir de la force de pressage, valeurs de correction qui correspondent au comportement de détente de la pièce pressée, modifié par rapport à la force de pressage prescrite.
EP90250140A 1989-06-15 1990-05-31 Procédé et dispositif pour fabriquer des articles pressés à dimensions exactes Expired - Lifetime EP0403040B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90250140T ATE96732T1 (de) 1989-06-15 1990-05-31 Verfahren und vorrichtung zur herstellung masshaltiger presslinge.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3919847 1989-06-15
DE3919847A DE3919847A1 (de) 1989-06-15 1989-06-15 Verfahren und vorrichtung zur herstellung masshaltiger presslinge

Publications (3)

Publication Number Publication Date
EP0403040A2 EP0403040A2 (fr) 1990-12-19
EP0403040A3 EP0403040A3 (fr) 1991-03-06
EP0403040B1 true EP0403040B1 (fr) 1993-11-03

Family

ID=6382959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90250140A Expired - Lifetime EP0403040B1 (fr) 1989-06-15 1990-05-31 Procédé et dispositif pour fabriquer des articles pressés à dimensions exactes

Country Status (5)

Country Link
US (1) US5024811A (fr)
EP (1) EP0403040B1 (fr)
JP (1) JPH082519B2 (fr)
AT (1) ATE96732T1 (fr)
DE (2) DE3919847A1 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3609107B2 (ja) * 1992-11-20 2005-01-12 インターメタリックス株式会社 圧粉成形体成形方法及び装置
ATE182841T1 (de) * 1993-11-24 1999-08-15 Stackpole Ltd Versetzte mehrteilige pressform
DE69328262T2 (de) * 1993-11-24 2000-12-21 Stackpole Ltd., Mississauga Hinterschnittene mehrteilige pressform
US6165400A (en) * 1996-05-09 2000-12-26 Stackpole Limited Compacted-powder opposed twin-helical gears and method
US6440357B1 (en) 1996-05-09 2002-08-27 Stackpole Limited Compacted-powder opposed twin-helical gears and method
DE19728767C1 (de) * 1997-07-07 1999-01-07 Forschungszentrum Juelich Gmbh Preßwerkzeug zum uniaxialen Kaltpressen von Pulverproben
DE19854075A1 (de) * 1998-11-24 2000-05-25 Henkel Kgaa Verfahren zur Serienfertigung von Formkörpern mit geringer Härteschwankung
US6669891B1 (en) * 1999-04-02 2003-12-30 Midwest Brake Bond Company Method and apparatus for producing brake lining material
US6531090B2 (en) * 2000-02-17 2003-03-11 Sumitomo Special Metals Co., Ltd. Method for producing powder compact and method for manufacturing magnet
GB2360825B (en) * 2000-03-30 2004-11-17 Formflo Ltd Gear wheels roll formed from powder metal blanks
JP3687492B2 (ja) * 2000-06-21 2005-08-24 株式会社村田製作所 誘電体ブロックのプレス成形方法
DE10142772C2 (de) * 2001-08-31 2003-09-25 Fette Wilhelm Gmbh Verfahren zur Herstellung von Pressteilen 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
DE10301224A1 (de) * 2003-01-15 2004-08-05 Maschinenfabrik Lauffer Gmbh & Co Kg Verfahren zur Endpositionsregelung einer Presse für maßgenaue Formkörper
WO2011001868A1 (fr) * 2009-07-03 2011-01-06 三和システムエンジニアリング株式会社 Procédé de moulage par compression pour poudre et dispositif pour celui-ci
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
WO2012015243A2 (fr) * 2010-07-30 2012-02-02 Lg Innotek Co., Ltd. Appareil de frittage par presse à chaud et élément presse
CN112170843B (zh) * 2020-09-29 2023-01-31 中国航发动力股份有限公司 一种旋流器流道的激光选区熔化成形工艺模型确定方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3389432A (en) * 1966-04-18 1968-06-25 Cincinnati Shaper Co Load indicating device for compacting press
US3698843A (en) * 1971-02-24 1972-10-17 Nat Forge Co High production isostatic molding device
DE2951716A1 (de) * 1979-12-19 1981-07-02 Mannesmann AG, 4000 Düsseldorf Verfahren und vorrichtung zum pressen von formkoerpern
JPS57209797A (en) * 1981-06-19 1982-12-23 Toyota Motor Corp Method and apparatus for controlling die position of liquid pressure type powder press
JPS58215299A (ja) * 1982-06-09 1983-12-14 Nippon Piston Ring Co Ltd 複合バルブシ−トの製造方法
JPS59183998A (ja) * 1983-04-02 1984-10-19 Hitachi Powdered Metals Co Ltd 圧粉体の成形不良防止法
SE456458B (sv) * 1983-07-12 1988-10-03 Nobel Elektronik Ab Reglerkrets
US4570229A (en) * 1983-09-19 1986-02-11 Pennwalt Corporation Tablet press controller and method
DE3715077A1 (de) * 1987-05-06 1988-12-01 Netzsch Maschinenfabrik Verfahren zum steuern einer presse

Also Published As

Publication number Publication date
JPH0327897A (ja) 1991-02-06
DE3919847C2 (fr) 1991-03-28
US5024811A (en) 1991-06-18
DE59003294D1 (de) 1993-12-09
EP0403040A2 (fr) 1990-12-19
JPH082519B2 (ja) 1996-01-17
DE3919847A1 (de) 1990-12-20
EP0403040A3 (fr) 1991-03-06
ATE96732T1 (de) 1993-11-15

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