EP0345279B1 - Procede de fabrication de pieces en metal - Google Patents

Procede de fabrication de pieces en metal Download PDF

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Publication number
EP0345279B1
EP0345279B1 EP88901544A EP88901544A EP0345279B1 EP 0345279 B1 EP0345279 B1 EP 0345279B1 EP 88901544 A EP88901544 A EP 88901544A EP 88901544 A EP88901544 A EP 88901544A EP 0345279 B1 EP0345279 B1 EP 0345279B1
Authority
EP
European Patent Office
Prior art keywords
mould
seal
upper die
liquid metal
metal
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
EP88901544A
Other languages
German (de)
English (en)
Other versions
EP0345279A1 (fr
Inventor
Reiner Kopp
Klaus-Rainer Baldner
Klaus Welschof
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
Publication of EP0345279A1 publication Critical patent/EP0345279A1/fr
Application granted granted Critical
Publication of EP0345279B1 publication Critical patent/EP0345279B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging

Definitions

  • the invention relates to a process for the production of metallic components according to the principle of casting press, wherein the amount of liquid metal required for a component is introduced into a mold, the cavity of which it fills incompletely, and is displaced therein by means of an upper die to form the component to be produced is, the upper die is sunk with the requirement of reducing the cavity of the mold on the component volume.
  • a mold with two halves which are axially displaceable with respect to one another is used, the halves of which are kept at a distance from one another during casting with wedges in such a way that the total volume is of an extent the wedge thicknesses larger than is required for the wheel to be manufactured.
  • the wedges are removed and the mold halves are pressed together to the size of the wheel to be manufactured, a limited deformation of the metal occurring.
  • the object of the invention is to further develop this method in such a way that components with more pronounced forgings properties can be produced.
  • these components should not only be high Have dimensional accuracy with a dense structure, but also be characterized by the transformation of the cast structure into a forging structure which is characteristic of forging.
  • the structure should be denser and the process time should be considerably reduced.
  • the invention solves this problem by the method steps according to the characterizing part of patent claim 1, which are advantageously further developed in subclaims 2 to 5.
  • a conventional forging process in which a cast, solidified and then reheated workpiece is assumed, there is the advantage that the structure is completely sealed.
  • a generic principle of casting press there is the advantage of achieving a structure which has a forged texture and accordingly enables a high mechanical load on the component produced.
  • the dimensional accuracy is also improved, in particular with regard to the fact that the hot plastic metal is subjected to the forming.
  • the seal which is not intended for casting presses or the conventional forging process, must allow expansion in view of the strength of the mold and the upper die, and in view of the pressures and temperatures used, so that the compression of the structure occurs reliably. Accordingly, copper or a copper alloy has proven to be particularly advantageous for this. If, for example, workpieces are to be made from a wrought aluminum alloy, a known, heat-resistant steel is used as the material for the mold and the upper die.
  • the metal to be processed, the mold with the upper die and the seal are to be coordinated on the material side so that the transition from shape and temperature is not impaired by the behavior of the materials mentioned.
  • the metal provided for the seal must be on the one hand behave plastically under the influence of the pressure created when the upper die is pressed in, while on the other hand it must not be dissolved or dissolved by the previously liquid metal.
  • the liquid metal after the upper die has been lowered, fills the mold space that is exaggerated by the seal essentially without pressure. This prevents the metal from escaping between the seal and the edge flange of the mold. The pressure is therefore only exerted when the solidification of the liquid metal has occurred.
  • the mold designated by 2 in FIG. 1 is filled with liquid metal 1 up to a height of approximately 2/3 of its cavity.
  • the temperature loss and the solidification of the liquid metal can largely be controlled by either preheating or cooling the mold 2. Means known to the person skilled in the art are available for both.
  • the upper die 3 is lowered in the direction of the arrow 7. This process takes place with the proviso that the upper die 3 first assumes the position shown in FIG. 2 and remains in this position. This results in the displacement of the liquid metal 1 in such a way that it likewise enters the mold space which is inflated by means of the seal 4, but without being exposed to any significant pressure. In this state, the upper die 3, with its edge flange 8 parallel to the mold flange 5, comes to rest against the upper edge of the seal 4.
  • the first step is to wait until the solidification of the liquid metal has occurred. This state is illustrated in FIG. 2 by a schematically illustrated directional structure.
  • the upper die 3 After solidification, the upper die 3 is pressed in in the direction of the arrow 9, as shown in FIG. 3.
  • the previously solidified metal 1 is now deformed, so that it also shifts in the horizontal direction beyond the opening edge 6 of the mold, with the wall thickness decreasing at the same time.
  • the seal 4 In the course of this deformation, the seal 4 is expanded, which is pressed flat. Because the timing of the press fit of the upper die 3 can be adjusted very precisely to the time of solidification, cavities, mold cavities and the like can be prevented by appropriate application of the pressing pressure. The risk of the formation of cavities or other cavities is greatly reduced anyway, because by presetting the upper die according to FIG. 2, the wall thickness of the still liquid metal is reduced, so that the disturbances of the type mentioned which occur frequently with larger, coherent volumes are practically avoided will. It is therefore important that the upper die is still practically pressure-free recessed with the proviso that the wall thickness of the mold space remaining thereafter to be filled by the liquid metal is reduced.
  • solidification of the liquid metal used above does not necessarily mean that this must be a thorough solidification of the liquid metal. It is sufficient if an edge zone of the metal has solidified with a considerable proportion of its thickness, while the core can still be liquid at the beginning of the deformation in order to also be solidified at the end of the deformation process.
  • the solidification can initially be limited to the edge cross-section, which leaves a core that can still be sensitive to the formation of cavities, which, however, can then no longer occur after the start of the deformation. In the manner already described, the time at which the upper die 3 is pressed in is adjusted to a time at which the solidification occurs, which means that the solidification does not always have to end.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Gasket Seals (AREA)

Abstract

Procédé de fabrication de pièces en métal basé sur le principe du moulage sous pression. Alors que dans le moulage sous pression conventionnel, le métal en fusion est introduit dans une cavité de moule et que la matrice supérieure est enfoncée dans le métal en fusion, à condition que la cavité soit complètement remplie pour autant que le métal reste en fusion, l'invention permet l'utilisation d'un moule ayant un joint (4) sur son rebord supérieur (5), et puis, dans une première étape, l'introduction de la matrice supérieure (3) à une profondeur suffisante, de sorte que le niveau de métal en fusion monte jusqu'à ce que l'espace surélevé créé par le joint (4) soit rempli. On laisse le métal se solidifier dans cet état, et ensuite la pièce dans sa forme définitive est réalisée par enfoncement de la matrice supérieure, avec déformation et expansion du joint. La pièce ainsi obtenue est complètement solide, a une stabilité dimensionnelle remarquable et possède la texture et la résistance mécanique correspondante d'une pièce forgée.

Claims (5)

  1. Procédé de fabrication de composants métalliques selon le principe du moulage sous pression élevée, pour lequel la quantité de métal liquide (1) approximativement nécessaire pour un composant alimente un moule (2) dont elle remplit incomplètement la cavité et dans laquelle elle est refoulée au moyen d'une matrice supérieure (3), avec moulage du composant à fabriquer, ladite matrice supérieure (3) étant abaissée de manière à diminuer la cavité du moule (2) pour la faire passer au volume du composant, caractérisé

       en ce que le remplissage incomplet de la cavité en métal liquide (1) a lieu dans un moule (2) équipé d'une bride périphérique supérieure plane (5) présentant un joint (4) entourant l'ouverture du moule et en surélevant le bord, le niveau du bain demeurant en-dessous du bord du moule,

       en ce que la matrice supérieure (3) y est en majeure partie descendue de sorte telle que le métal liquide (1), remplit la cavité en dépassant le volume surélevé par le joint (4).

       en ce que l'on attend ensuite la rigidification du métal liquide (1),

       et en ce que, après, la matrice supérieure (3) y est descendue, transformant le métal pour obtenir le composant prévu avec extension simultanée du joint.
  2. Procédé selon la revendication 1, caractérisé en ce que

       l'introduction de la matrice supérieure (3) ayant lieu par la suite est réalisé dans le cadre de la rigidification du métal encore plastiquement chaud.
  3. Procédé selon la revendication 1, caractérisé en ce

       que le joint est aplati par pression sous l'effet d'une bride périphérique de la matrice supérieure parallèle à la bride de la coquille lors du formage ultérieur.
  4. Procédé selon la revendication 1, caractérisé en ce

       qu'est utilisé, pour le joint, du cuivre ou un alliage de cuivre.
  5. Procédé selon la revendication 1, caractérisé en ce

       qu'après la descente de la matrice supérieure, le métal liquide remplit le volume du moule surélevé par le joint en prépondérance sans pression.
EP88901544A 1987-02-13 1988-02-11 Procede de fabrication de pieces en metal Expired - Lifetime EP0345279B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3704457 1987-02-13
DE19873704457 DE3704457A1 (de) 1987-02-13 1987-02-13 Verfahren zur herstellung metallischer bauteile

Publications (2)

Publication Number Publication Date
EP0345279A1 EP0345279A1 (fr) 1989-12-13
EP0345279B1 true EP0345279B1 (fr) 1992-12-16

Family

ID=6320867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901544A Expired - Lifetime EP0345279B1 (fr) 1987-02-13 1988-02-11 Procede de fabrication de pieces en metal

Country Status (6)

Country Link
US (1) US4967826A (fr)
EP (1) EP0345279B1 (fr)
JP (1) JP2622875B2 (fr)
AU (1) AU1240888A (fr)
DE (2) DE3704457A1 (fr)
WO (1) WO1988006067A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3812740A1 (de) * 1988-04-16 1989-10-26 Wehag Leichtmetall Gmbh Giess-schmiede-verfahren
GB9501263D0 (en) * 1995-01-23 1995-03-15 Snowden Pte Ltd A door assembly
US5906235A (en) * 1995-06-16 1999-05-25 Thomas Robert Anthony Pressurized squeeze casting apparatus and method and low pressure furnace for use therewith
US5730205A (en) * 1996-07-15 1998-03-24 Thomas; Robert Anthony Die assembly for squeeze casting
JP3616512B2 (ja) 1997-12-10 2005-02-02 住友ゴム工業株式会社 非晶質合金製造用の金型
US6805189B2 (en) * 2002-10-30 2004-10-19 Howmet Research Corporation Die casting
JP6175345B2 (ja) * 2013-10-19 2017-08-02 株式会社Ｊｆｓ貿易 黒鉛球状化剤の製造法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191984A (en) * 1922-03-07 1923-01-25 Duncan Stewart And Company Ltd Improvements in the production of steel wheels for railways and the like
US2233057A (en) * 1937-11-09 1941-02-25 Signal Service Corp Molding apparatus
US2716792A (en) * 1950-10-05 1955-09-06 Kroyer Karl Kristian Kobs Method of cast-forging metals
DE1458098A1 (de) * 1963-03-02 1968-11-28 Multifastener Corp Vorrichtung und Verfahren zum Pressgiessen von Metall
FR1383823A (fr) * 1963-09-24 1965-01-04 Procédé de fabrication de pièces moulées en acier, fonte, ou autres métaux lourds et pièces ainsi fabriquées
JPS55136488A (en) * 1979-04-10 1980-10-24 Nippon Soken Positive temperature coefficient porcelain semiconductor
JPS6021023B2 (ja) * 1979-09-28 1985-05-24 ア−ト金属工業株式会社 溶湯鍛造法
JPS5668576A (en) * 1979-11-08 1981-06-09 Art Kinzoku Kogyo Kk Manufacturing method of fiber reinforced compound product
GB2104810B (en) * 1981-08-27 1985-04-17 Ae Plc Squeeze casting apparatus

Also Published As

Publication number Publication date
DE3704457A1 (de) 1988-08-25
JPH02503402A (ja) 1990-10-18
US4967826A (en) 1990-11-06
EP0345279A1 (fr) 1989-12-13
DE3876794D1 (de) 1993-01-28
JP2622875B2 (ja) 1997-06-25
AU1240888A (en) 1988-09-14
WO1988006067A1 (fr) 1988-08-25

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