EP0508858B1 - Perfectionnements au procédé d'extrusion pour alliages à base de zinc - Google Patents

Perfectionnements au procédé d'extrusion pour alliages à base de zinc Download PDF

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Publication number
EP0508858B1
EP0508858B1 EP92400887A EP92400887A EP0508858B1 EP 0508858 B1 EP0508858 B1 EP 0508858B1 EP 92400887 A EP92400887 A EP 92400887A EP 92400887 A EP92400887 A EP 92400887A EP 0508858 B1 EP0508858 B1 EP 0508858B1
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EP
European Patent Office
Prior art keywords
extrusion
zinc
alloys
extruded
extrusion die
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
EP92400887A
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German (de)
English (en)
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EP0508858A1 (fr
Inventor
Galvan C. Ramon
Torres V. Gabriel
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.)
Falmex SA de CV
Original Assignee
Falmex SA de CV
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Filing date
Publication date
Application filed by Falmex SA de CV filed Critical Falmex SA de CV
Publication of EP0508858A1 publication Critical patent/EP0508858A1/fr
Application granted granted Critical
Publication of EP0508858B1 publication Critical patent/EP0508858B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/165—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon of zinc or cadmium or alloys based thereon

Definitions

  • the present invention relates to an improved process for extruding shapes from zinc-based alloys.
  • Zinc and zinc-based alloys have traditionally been considered unsuitable for extrusion processes, due to their mechanical characteristics. Numerous attempts have heretofore been made to develop zinc alloys having improved properties, in order to render them appropriate for extrusion, rolling and other industrial processes, for the production of formed articles.
  • the present invention relates to improvements on extrusion process of superplastic zinc-based alloys with enhanced mechanical properties, by which extrusion is accomplished by controlling the superplastic behavior throughout the extrusion process by preventing the material to exceed the eutectoid temperature, avoiding thereby the ⁇ -phase transformation, and guaranteeing the dimensional stability of the final product.
  • Hare U.S. Patent No. 3,676,115 ; Chollet et al U.S. Patent No. 3,741,819 ; Winter et al U.S. patent No. 2,169,441 ; Gervais et al U.S. Patent 3,793,091; Wayne U.S. Patent No.3,850,622 ; and Dollar U.S. Patents Nos. 3,966,505 and 4,029,525, refer to zinc-based alloys having improved physical properties, as well as to the various methods of manufacturing them. These alloys have proved to be suitable for different industrial processes, such as die-casting, rolling and extrusion.
  • Mexican Patent No. 161483 issued to Universidad Nacional Autonoma de México (National Autonomous University of Mexico) refers to a low cost extrusion process of zinc-aluminum-copper alloys, whereby structural and architectural shapes having enhanced mechanical properties are obtained.
  • the extrusion process covered by Mexican Patent No. 161483 uses zinc-based alloys comprising 69 - 77 Zn, 20-30 Al, and 1-8 Cu percentage weight, with trace impurities.
  • the process essentially consists of pre-heating the alloy ingots within a temperature range of 150-350°C, extruding at speed between 1 and 20 meters/minute, straightening the extruded shapes immediately thereafter, and cooling same at ambient temperatures.
  • the European Patent Application 0 216 519 refers to a method of making a superplastic zinc/aluminium alloy which is highly plastic at temperature of 240°C or above and which can be extruded at 150°-225°C.
  • the present invention relates to improvements on an extrusion process for zinc-based alloys. More specifically, the present invention refers to improvements on an extrusion process of zinc-based alloys, such improvements consisting, on one hand, of preventing the temperature of the material from exceeding the eutectoid temperature, both during the pre-heating of the alloy ingot and during the whole extrusion process, and thus preventing the material from undergoing the ⁇ - phase transformation, and on the other, subjecting the extruded product to cooling by forced-air and/or water at the exit of the extrusion die, in order to ensure that the extruded product is maintained out of the superplastic ⁇ -phase, that is, within the ⁇ + ⁇ -phase, and lastly, receiving the extruded product on a conveyor table, in order to ensure the dimensional stability of the extruded product, prior to its straightening.
  • the present inventors have developed various improvements on the extrusion process of Zinc-based alloys, whereby optimal industrial results have been achieved.
  • the extrusion process for these alloys has been improved by cooling the extruded products with forced air and/or water, as the products leave the extrusion die, in order to prevent the material from reaching the eutectoid temperature.
  • the present inventors have devised an improvement consisting of utilizing a conveyor to maintain the product configuration uniform, thus preventing any dimensional variations an the final product.
  • the present invention provides a process for extruding shapes from zinc-based alloys, of the type comprising preheating the alloyed ingots as well as the container and the extrusion die; extruding such ingots at a speed comprised between 1 and 20 meters per minute and applying the corresponding pressure loads; straightening thereafter the extruded shape, and letting same cool, characterized by:
  • said alloys are Zn-Al-Cu alloys and have the following formula by weight: 69-79 Zn, 20-30 Al, and 1.0-8 Cu.
  • a Zn-Al-Cu alloy with nominal composition of Al-21%, Cu-2%, Zn-balance was extruded in a 1,800 ton aluminum extrusion machine, applying the parameters referred to in Mexican Patent No. 161483.

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  • 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)
  • Extrusion Of Metal (AREA)

Claims (2)

  1. Procédé pour l'extrusion de profilés à partir d'alliages à base de zinc, du type comprenant le préchauffage des lingots alliés ainsi que du récipient et de la filière d'extrusion; l'extrusion de ces lingots à une vitesse comprise entre 1 et 20 mètres par minute et l'application des charges de pression correspondantes; le dressage ensuite du profilé extrudé, lequel est laissé refroidir, caractérisé par :
    (i) le choix de la gamme de températures de l'étape de préchauffage et de l'étape d'extrusion à une valeur comprise entre 176°C et 273°C, avec restriction de la gamme de températures pendant le traitement d'extrusion à une température inférieure à la température eutectoïde,
    (ii) l'application d'un refroidissement rapide avec de l'air forcé et/ou de l'eau aux produits extrudés alors qu'ils quittent la filière d'extrusion, et
    (iii) l'utilisation d'un transporteur mécanique pour recevoir les produits extrudés au fur et à mesure qu'ils quittent la filière d'extrusion avant l'étape de dressage, pour maintenir uniforme la configuration du produit.
  2. Procédé suivant la revendication 1, caractérisé en ce que les alliages sont des alliages Zn-Al-Cu et ont la formule suivante en poids : 69 à 79 de Zn, 20 à 30 d'Al et 1,0 à 8 de Cu.
EP92400887A 1991-04-01 1992-03-31 Perfectionnements au procédé d'extrusion pour alliages à base de zinc Expired - Lifetime EP0508858B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MX2515391 1991-04-01
MX25153 1991-04-01

Publications (2)

Publication Number Publication Date
EP0508858A1 EP0508858A1 (fr) 1992-10-14
EP0508858B1 true EP0508858B1 (fr) 1997-01-15

Family

ID=19742699

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92400887A Expired - Lifetime EP0508858B1 (fr) 1991-04-01 1992-03-31 Perfectionnements au procédé d'extrusion pour alliages à base de zinc

Country Status (4)

Country Link
EP (1) EP0508858B1 (fr)
JP (1) JPH06234012A (fr)
AT (1) ATE147800T1 (fr)
DE (1) DE69216677D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8147585B2 (en) 2008-09-17 2012-04-03 Cool Polymers, Inc. Multi-component composition metal injection molding
CN110629057A (zh) * 2019-10-15 2019-12-31 常州大学 一种高强韧性ZZnAl4Y锌合金的铸造方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289056A (en) * 1994-04-26 1995-11-08 Johnson Matthey Plc Methods and materials for brazing aluminium
US5620537A (en) * 1995-04-28 1997-04-15 Rockwell International Corporation Method of superplastic extrusion
ES2288097B2 (es) * 2005-11-11 2009-04-01 Universidad Complutense De Madrid Proceso de extrusion a partir de aleaciones de zinc-aluminio-plata.
CN101698912B (zh) * 2009-11-06 2011-08-17 湖南华康新材料有限公司 适于连续挤压的铜合金代用材料高性能变形锌基合金
CN102463271B (zh) * 2010-11-08 2014-01-08 北京有色金属研究总院 一种锌基合金薄壁管材的制备方法
CN106636751A (zh) * 2015-11-04 2017-05-10 北京有色金属研究总院 一种高耐磨性Zn-Al合金的制备方法
CN109735744B (zh) * 2019-01-28 2020-05-26 东北大学 一种具有室温超塑性的锌基合金棒材/板材及其制备方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1373190A (en) * 1971-11-03 1974-11-06 Cominco Ltd Zinc forging alloy and its heat treatment
MX161483A (es) * 1984-04-06 1990-10-05 Univ Mexico Proceso de extrusion de perfiles a partir de aleaciones de zinc-alumino-cobre
GB8521017D0 (en) * 1985-08-22 1985-10-16 Bnf Metals technology centre alloy

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8147585B2 (en) 2008-09-17 2012-04-03 Cool Polymers, Inc. Multi-component composition metal injection molding
US8591804B2 (en) 2008-09-17 2013-11-26 Cool Polymers, Inc. Multi-component composition metal injection molding
US9044806B2 (en) 2008-09-17 2015-06-02 Cool Polymers, Inc. Multi-component composition metal injection molding
CN110629057A (zh) * 2019-10-15 2019-12-31 常州大学 一种高强韧性ZZnAl4Y锌合金的铸造方法
CN110629057B (zh) * 2019-10-15 2021-09-28 常州大学 一种高强韧性ZZnAl4Y锌合金的铸造方法

Also Published As

Publication number Publication date
ATE147800T1 (de) 1997-02-15
EP0508858A1 (fr) 1992-10-14
DE69216677D1 (de) 1997-02-27
JPH06234012A (ja) 1994-08-23

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