EP0518815A1 - Procédé de chauffage d'une pièce en alliage métallique - Google Patents

Procédé de chauffage d'une pièce en alliage métallique Download PDF

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Publication number
EP0518815A1
EP0518815A1 EP92810382A EP92810382A EP0518815A1 EP 0518815 A1 EP0518815 A1 EP 0518815A1 EP 92810382 A EP92810382 A EP 92810382A EP 92810382 A EP92810382 A EP 92810382A EP 0518815 A1 EP0518815 A1 EP 0518815A1
Authority
EP
European Patent Office
Prior art keywords
temperature
workpiece
heating
alloy
workpieces
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.)
Granted
Application number
EP92810382A
Other languages
German (de)
English (en)
Other versions
EP0518815B1 (fr
Inventor
Jean-Pierre Gabathuler
Yves Krähenbühl
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
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 Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Publication of EP0518815A1 publication Critical patent/EP0518815A1/fr
Application granted granted Critical
Publication of EP0518815B1 publication Critical patent/EP0518815B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase

Definitions

  • the invention relates to a method for heating a workpiece made of a solid metal alloy to a final temperature between the solidus and liquidus temperature of the alloy, in particular for producing a partially solid, partially liquid, thixotropic state of the workpiece.
  • these partially solid, partially liquid metal alloy phases are first cooled to below the solidus temperature of the alloy - generally to room temperature - and only heated to the required processing temperature at which the thixotropic properties appear just before they are further processed.
  • Coarsening of the cast grains is undesirable both in the production of the metal alloy phase with thixotropic properties and in the subsequent heating of the workpieces to the further processing temperature.
  • the inventors have set themselves the goal of creating a method of the type mentioned at the outset with which the thixotropic state of a workpiece made of a metal alloy for whose further processing can be stopped inexpensively and without having to accept a significant coarsening of the grain.
  • the workpiece is heated convectively in a first step, by heat conduction, heat radiation or another non-inductive heat transfer to a temperature just below the solidus temperature of the metal alloy and in a subsequent second step inductively to the final temperature.
  • the desired final temperature is reached quickly by the inductive heating in the second step and consequently the dwell time of the workpiece in the partially solid, liquid state, in which the greatest tendency to coarsen the grain is observed, is kept as short as possible. Since in this second step there is only a temperature increase on the workpiece of approximately 30 ° to 100 ° C., the power and thus the size of the induction heating system can also be designed to be relatively small and therefore inexpensive. On the other hand, the energy loss during heating through non-inductive heat transfer in the first step, taking into account the large temperature interval, is significantly less than with a corresponding induction heating.
  • the temperature reached after the first heating step is about 10 ° to 50 ° C below the solidus temperature of the metal alloy.
  • the solidus temperature should never be exceeded.
  • the inductive heating of the workpiece in the second step is preferably carried out with an alternating current frequency between 50 and 1000 Hz and a heating power between approximately 10 and 200 kW.
  • the alternating current frequency and heating power are matched to one another in such a way that the surface temperature of the workpiece never exceeds the desired end temperature while maintaining the shortest possible time until the end temperature is reached.
  • the process according to the invention is expediently carried out continuously under production conditions.
  • the heating in the first step is preferably carried out in a continuous or tunnel oven and in the second step cyclically by transferring it into successive induction coils, the throughput speed of the workpieces through the continuous or tunnel oven, the cycle time of the induction heating system and the cycle time of the subsequent further processing system being coordinated will.
  • Several lines of induction coils can also be used per continuous or tunnel furnace.
  • the method according to the invention is preferably used in the production of workpieces intended for further processing with thixotropic properties, in particular for further processing bolts or ingots in die casting, forging, rolling and pressing systems.
  • the method is particularly suitable for heating workpieces made of aluminum alloys.
  • An alloy of the type AlSi7Mg with 6.9% by weight Si and 0.4% by weight Mg was cast in a continuous casting installation to produce a thixotropic structure to form a strand of 75 mm in diameter and cut into bolts of 180 mm in height.
  • the average diameter of the globular cast grains was less than 100 ⁇ m.
  • the solidus temperature of the alloy is 555 ° C.
  • the bolts were heated to the set furnace temperature of 540 ° C for two hours in a holding oven with air circulation.
  • the bolts were then heated in an induction coil with an output of 25 kW and an AC frequency of 250 Hz within 6 minutes to the final temperature of about 580 ° C - corresponding to a liquid metal content of 30 to 40%.
  • Metallographic examination of bolt cross sections showed that no significant grain coarsening had occurred, i.e. the average grain size was still below 100 ⁇ m.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Forging (AREA)
EP92810382A 1991-06-10 1992-05-21 Procédé de chauffage d'une pièce en alliage métallique Expired - Lifetime EP0518815B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1730/91A CH683267A5 (de) 1991-06-10 1991-06-10 Verfahren zum Aufheizen eines Werkstückes aus einer Metallegierung.
CH1730/91 1991-06-10

Publications (2)

Publication Number Publication Date
EP0518815A1 true EP0518815A1 (fr) 1992-12-16
EP0518815B1 EP0518815B1 (fr) 1994-12-28

Family

ID=4217257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92810382A Expired - Lifetime EP0518815B1 (fr) 1991-06-10 1992-05-21 Procédé de chauffage d'une pièce en alliage métallique

Country Status (4)

Country Link
US (1) US5282910A (fr)
EP (1) EP0518815B1 (fr)
CH (1) CH683267A5 (fr)
DE (1) DE59201065D1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720213A1 (fr) * 1994-05-18 1995-11-24 Buehler Ag Geb Procédé et dispositifs pour chauffer des corps métalliques.
EP0692328A1 (fr) * 1994-06-14 1996-01-17 Salzburger Aluminium Aktiengesellschaft Procédé pour la fabrication de pièces moulées, en alliage d'aluminium
EP0703300A1 (fr) * 1994-09-23 1996-03-27 Reynolds Wheels International Ltd. Procédé et appareil de chauffage de pièces en alliages métalliques jusqu'à l'état semi-solide ou semi-liquide en vue du formage dans le domaine thixotropique
DE19532244A1 (de) * 1995-09-01 1997-03-06 Peak Werkstoff Gmbh Verfahren zur Herstellung von dünnen Rohren (I)
DE19532253A1 (de) * 1995-09-01 1997-03-06 Peak Werkstoff Gmbh Verfahren zur Herstellung von dünnen Rohren (II)
WO1997010065A1 (fr) * 1995-09-13 1997-03-20 The Whitaker Corporation Appareil pour preparer une billette de preforme a utiliser dans des operations de fabrication
FR2747327A1 (fr) * 1996-04-11 1997-10-17 Pechiney Recherche Procede et outillage de filage a grande vitesse d'alliages d'aluminium et profile obtenu
DE19532252C2 (de) * 1995-09-01 1999-12-02 Erbsloeh Ag Verfahren zur Herstellung von Laufbuchsen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19836883A1 (de) * 1998-08-14 2000-02-17 Schuler Hydrap Gmbh & Co Kg Verfahren zur Herstellung von Formteilen aus thixotropen Metall-Legierungen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2266748A1 (fr) * 1974-04-04 1975-10-31 Pechiney Aluminium
GB2112676A (en) * 1982-01-06 1983-07-27 Olin Corp Method and apparatus for forming a thixoforged copper base alloy cartridge casing
EP0090253A2 (fr) * 1982-03-30 1983-10-05 Alumax Inc. Composition métallique à grains fins
EP0093248A2 (fr) * 1982-03-30 1983-11-09 Alumax Inc. Procédé et appareillage de formation de structures d'alliages semi-solides par un travail à chaud
EP0158946A2 (fr) * 1984-04-20 1985-10-23 Park-Ohio Industries, Inc. Procédé et appareil pour le chauffage de pièces métalliques non-magnétiques

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948650A (en) * 1972-05-31 1976-04-06 Massachusetts Institute Of Technology Composition and methods for preparing liquid-solid alloys for casting and casting methods employing the liquid-solid alloys
US3959651A (en) * 1974-04-24 1976-05-25 American Optical Corporation Electron microscope
IT1239118B (it) * 1989-11-24 1993-09-28 Elind Impianto per il riscaldamento di barre e billette di acciaio a monte di una cesoia per lavorazioni successive
US5009844A (en) * 1989-12-01 1991-04-23 General Motors Corporation Process for manufacturing spheroidal hypoeutectic aluminum alloy

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2266748A1 (fr) * 1974-04-04 1975-10-31 Pechiney Aluminium
GB2112676A (en) * 1982-01-06 1983-07-27 Olin Corp Method and apparatus for forming a thixoforged copper base alloy cartridge casing
EP0090253A2 (fr) * 1982-03-30 1983-10-05 Alumax Inc. Composition métallique à grains fins
EP0093248A2 (fr) * 1982-03-30 1983-11-09 Alumax Inc. Procédé et appareillage de formation de structures d'alliages semi-solides par un travail à chaud
EP0158946A2 (fr) * 1984-04-20 1985-10-23 Park-Ohio Industries, Inc. Procédé et appareil pour le chauffage de pièces métalliques non-magnétiques

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2725391A1 (fr) * 1994-05-18 1996-04-12 Buehler Ag Geb Installation de moulage sous pression avec un transducteur de temps
FR2726495A1 (fr) * 1994-05-18 1996-05-10 Buehler Ag Geb Installation de moulage sous pression avec un capteur de pression
FR2720213A1 (fr) * 1994-05-18 1995-11-24 Buehler Ag Geb Procédé et dispositifs pour chauffer des corps métalliques.
EP0692328A1 (fr) * 1994-06-14 1996-01-17 Salzburger Aluminium Aktiengesellschaft Procédé pour la fabrication de pièces moulées, en alliage d'aluminium
US5665302A (en) * 1994-09-23 1997-09-09 Reynolds Wheels International Ltd. Method and equipment for bringing metal alloy ingots, billets and the like to the semisolid or semiliquid state in readiness for thixotropic forming
EP0703300A1 (fr) * 1994-09-23 1996-03-27 Reynolds Wheels International Ltd. Procédé et appareil de chauffage de pièces en alliages métalliques jusqu'à l'état semi-solide ou semi-liquide en vue du formage dans le domaine thixotropique
US5869811A (en) * 1994-09-23 1999-02-09 Reynolds Wheels International Ltd. Method and equipment for bringing metal alloy ingots, billets and the like to the semisolid or semiliquid state in readiness for thixotropic forming
DE19532253A1 (de) * 1995-09-01 1997-03-06 Peak Werkstoff Gmbh Verfahren zur Herstellung von dünnen Rohren (II)
DE19532253C2 (de) * 1995-09-01 1998-07-02 Peak Werkstoff Gmbh Verfahren zur Herstellung von dünnwandigen Rohren (II)
DE19532244C2 (de) * 1995-09-01 1998-07-02 Peak Werkstoff Gmbh Verfahren zur Herstellung von dünnwandigen Rohren (I)
DE19532244A1 (de) * 1995-09-01 1997-03-06 Peak Werkstoff Gmbh Verfahren zur Herstellung von dünnen Rohren (I)
DE19532252C2 (de) * 1995-09-01 1999-12-02 Erbsloeh Ag Verfahren zur Herstellung von Laufbuchsen
US6030577A (en) * 1995-09-01 2000-02-29 Erbsloh Aktiengesellschaft Process for manufacturing thin pipes
WO1997010065A1 (fr) * 1995-09-13 1997-03-20 The Whitaker Corporation Appareil pour preparer une billette de preforme a utiliser dans des operations de fabrication
FR2747327A1 (fr) * 1996-04-11 1997-10-17 Pechiney Recherche Procede et outillage de filage a grande vitesse d'alliages d'aluminium et profile obtenu

Also Published As

Publication number Publication date
DE59201065D1 (de) 1995-02-09
US5282910A (en) 1994-02-01
EP0518815B1 (fr) 1994-12-28
CH683267A5 (de) 1994-02-15

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