EP0969111B1 - Boulon métallique ayant des propriétés thixotropes et son procédé de fabrication - Google Patents

Boulon métallique ayant des propriétés thixotropes et son procédé de fabrication Download PDF

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Publication number
EP0969111B1
EP0969111B1 EP98810591A EP98810591A EP0969111B1 EP 0969111 B1 EP0969111 B1 EP 0969111B1 EP 98810591 A EP98810591 A EP 98810591A EP 98810591 A EP98810591 A EP 98810591A EP 0969111 B1 EP0969111 B1 EP 0969111B1
Authority
EP
European Patent Office
Prior art keywords
cross
bolt
metal
thixotropic
bolts
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
EP98810591A
Other languages
German (de)
English (en)
Other versions
EP0969111A1 (fr
Inventor
Miroslaw Plata
Martin Bolliger
Grégoire Arnold
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
Alcan Technology and Management 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 Alcan Technology and Management Ltd filed Critical Alcan Technology and Management Ltd
Priority to DE59803922T priority Critical patent/DE59803922D1/de
Priority to AT98810591T priority patent/ATE216734T1/de
Priority to EP98810591A priority patent/EP0969111B1/fr
Publication of EP0969111A1 publication Critical patent/EP0969111A1/fr
Application granted granted Critical
Publication of EP0969111B1 publication Critical patent/EP0969111B1/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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
    • 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 metal bolt according to the preamble of claim 1. Within the scope of the invention also a process for the production of metal bolts and their use.
  • Bolts with thixotropic properties are known by vertical or horizontal continuous casting of a metal alloy.
  • the molten metal in the solidification area is stirred vigorously, whereby above all have proven electromagnetic stirring devices.
  • the dendrites that form are sheared off or developed back so that these primarily solidifying solid particles are essentially globulitic Take shape.
  • Bolts made of continuous cast material, for further processing are provided in the thixotropic state, according to the state of the Technique a circular cross section.
  • a temperature gradient between the stud surface and the stud core, which is more pronounced the higher the heating rate is chosen.
  • the liquid metal portion over the bolt cross section at the processing temperature within specified tolerance values lies, for example, between 30 and 50%.
  • Energy input in the bolt in the area of the solid / liquid transition between Solidus and liquidus temperature of the metal alloy so slow that at the The maximum permissible temperature is not exceeded and the temperature in the bolt core is not significantly lower, so that the liquid metal portion over the bolt cross section in the specified tolerance range lies.
  • the invention is therefore based on the object, metal bolt of the beginning mentioned type so that in comparison to conventional round bolts faster heating up for further processing in the required temperature is possible in the thixotropic state.
  • a metal bolt with the features of claim 1 leads to the achievement of the object according to the invention.
  • the one when heating up of the bolt to the thixotropic state between the lowest temperature in the core and the highest temperature on the surface of the bolt temperature difference is compared to a bolt with a circular Cross-section with the same cross-sectional area under the same heating conditions kept smaller or reached after a shorter heating-up time.
  • the essential essence of the invention is that if there is a deviation from the circular cross-sectional shape with the same cross-sectional area the bolt surface enlarged and at the same time the distance between the pin surface and core is downsized.
  • Both measures mean that the Heating up a bolt designed according to the invention in comparison to a round bolt according to the prior art with the same cross-sectional area under the same heating conditions, smaller temperature differences between the bolt surface and the bolt core.
  • each bolt has a different shape from the circular one Cross section the above-mentioned advantage over round bolts on.
  • the bolt shape can be made by special cross-sectional shapes for example, better adapted to molded parts to be produced by thixoforming become.
  • the shapes for the bolt cross section are dumbbell, cross, star, H or double cross shape.
  • the metal bolts according to the invention all are in the state of the Technique for the production of metal bolts with thixotropic properties for the Suitable for further processing in the thixotropic state, in which a strand with a thixotropic structure is made from a molten metal cast, the cast strand cut to bolts and the bolts for adjustment of the thixotropic state are heated before further processing.
  • the molten metal becomes a strand with one described above, cross section deviating from the circular shape.
  • the bolts according to the invention and their manufacture are not limited to a specific one Limited material.
  • preferred materials are aluminum, Magnesium, copper, steel and their alloys, whereby in particular for light metals and very particularly preferably for aluminum and magnesium alloys, which, for example, can also be fiber or particle reinforced can achieve excellent results.
  • the bolts are preferred on a horizontal continuous casting machine with a electromagnetic stirring device arranged in the area of the mold carried out.
  • a electromagnetic stirring device arranged in the area of the mold carried out.
  • the bolts are heated for further processing in the thixotropic state usually inductive. In principle, however, other heating methods can also be used or devices are used with which bolts quickly and can be heated evenly.
  • a particularly preferred area of application for the inventive Metal stud is the production of molded parts by thixoforming.
  • Thixoforming is converted into the thixotropic state by heating Metal bolts placed in a filling chamber and by pressurization introduced or shot into a mold cavity by means of a piston, in which the thixotropic metal alloy solidifies as a molded part.
  • Another preferred area of application is the production of a profile through thixoextrusion. In this process one becomes a thixotropic state heated bolt pressed into a profile strand by a cooled mold.
  • FIG. 1 shows that the liquid metal portion of the alloy rises from about 10 to 50% in the range of the binary eutectic within a narrow temperature range of about 2 ° C.
  • the diagram clearly shows that the temperature gradient across the cross-section of a metal bolt in the thixotropic state must be kept small in order to produce a liquid metal component that is within narrow tolerance limits.
  • the diagrams shown in FIGS. 2 and 3 were determined on round bolts with a diameter of 60 mm from the above-mentioned alloy. The bolts were heated inductively in two stages.
  • T O is the temperature at the stud surface
  • T K is the temperature in the stud core
  • fl O is the liquid metal portion on the stud surface
  • fl K is the liquid metal portion in the stud core
  • t 2 is the heating time of the second stage.
  • FIGS. 4 to 9 show examples of possible cross-sectional shapes of metal bolts. Depending on the application, there may be a specific cross-sectional shape turn out to be cheap. Essentially oval, dumbbell, cross or star-shaped and H or double cross-shaped bolt cross sections according to FIGS. 4 to 9 are suitable, for example, for the simultaneous production of several parts from a bolt or for large parts. Especially in combination with one or more slit-shaped gate cross sections Expand the range of parts that can be manufactured using thixoforms. Slotted Gate cross sections increase the shear rate and subsequently lead to one lower pressing force and better mold filling capacity, which the Production of complex shaped parts allowed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (4)

  1. Goujon métallique ayant des propriétés thixotropes pour la transformation à l'état thixotrope, dans lequel le goujon présente une section transversale qui diffère d'une forme circulaire,
    caractérisé en ce que la section du goujon présente une forme en 8, en croix, en étoile, en H, ou en double croix.
  2. Procédé pour la fabrication de goujons métalliques ayant des propriétés thixotropes pour la transformation à l'état thixotrope, dans lequel on coule à partir de métal en fusion un ruban à structure thixotrope et présentant une section qui diffère d'une forme circulaire, on découpe à longueur le ruban coulé pour former des goujons, et on réchauffe les goujons afin d'établir l'état thixotrope avant la transformation,
    caractérisé en ce que la section du goujon présente une forme en 8, en croix, en étoile, en H, ou en double croix.
  3. Utilisation d'un goujon métallique selon la revendication 1, ou application du procédé selon la revendication 2, pour la réalisation d'une pièce conformée par thixo-formage.
  4. Utilisation d'un goujon métallique selon la revendication 1, ou application du procédé selon la revendication 2, pour la réalisation d'un profil par thixo-extrusion.
EP98810591A 1998-06-26 1998-06-26 Boulon métallique ayant des propriétés thixotropes et son procédé de fabrication Expired - Lifetime EP0969111B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59803922T DE59803922D1 (de) 1998-06-26 1998-06-26 Metallbolzen mit thixotropen Eigenschaften und Verfahren zu seiner Herstellung
AT98810591T ATE216734T1 (de) 1998-06-26 1998-06-26 Metallbolzen mit thixotropen eigenschaften und verfahren zu seiner herstellung
EP98810591A EP0969111B1 (fr) 1998-06-26 1998-06-26 Boulon métallique ayant des propriétés thixotropes et son procédé de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98810591A EP0969111B1 (fr) 1998-06-26 1998-06-26 Boulon métallique ayant des propriétés thixotropes et son procédé de fabrication

Publications (2)

Publication Number Publication Date
EP0969111A1 EP0969111A1 (fr) 2000-01-05
EP0969111B1 true EP0969111B1 (fr) 2002-04-24

Family

ID=8236160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98810591A Expired - Lifetime EP0969111B1 (fr) 1998-06-26 1998-06-26 Boulon métallique ayant des propriétés thixotropes et son procédé de fabrication

Country Status (3)

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EP (1) EP0969111B1 (fr)
AT (1) ATE216734T1 (fr)
DE (1) DE59803922D1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4434837A (en) * 1979-02-26 1984-03-06 International Telephone And Telegraph Corporation Process and apparatus for making thixotropic metal slurries
EP0483943A2 (fr) * 1990-10-29 1992-05-06 Rheo-Technology, Ltd Procédé et dispositif de fabrication d'alliages métalliques thixotropes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPO110296A0 (en) * 1996-07-18 1996-08-08 University Of Melbourne, The Liquidus casting of alloys

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4434837A (en) * 1979-02-26 1984-03-06 International Telephone And Telegraph Corporation Process and apparatus for making thixotropic metal slurries
EP0483943A2 (fr) * 1990-10-29 1992-05-06 Rheo-Technology, Ltd Procédé et dispositif de fabrication d'alliages métalliques thixotropes

Also Published As

Publication number Publication date
EP0969111A1 (fr) 2000-01-05
ATE216734T1 (de) 2002-05-15
DE59803922D1 (de) 2002-05-29

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