EP1651373B1 - Procede de coulage en continu, element coule, article fa onne en metal et appareil de coulage en continu - Google Patents

Procede de coulage en continu, element coule, article fa onne en metal et appareil de coulage en continu Download PDF

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Publication number
EP1651373B1
EP1651373B1 EP04771114A EP04771114A EP1651373B1 EP 1651373 B1 EP1651373 B1 EP 1651373B1 EP 04771114 A EP04771114 A EP 04771114A EP 04771114 A EP04771114 A EP 04771114A EP 1651373 B1 EP1651373 B1 EP 1651373B1
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EP
European Patent Office
Prior art keywords
continuous casting
rotational molding
molding members
cast
temperature
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.)
Not-in-force
Application number
EP04771114A
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German (de)
English (en)
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EP1651373A1 (fr
EP1651373A4 (fr
Inventor
Yasuhisa c/o Oyama Regional Office HAGIWARA
Shigeru Yanagimoto
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.)
Resonac Holdings Corp
Original Assignee
Showa Denko KK
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Publication date
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Publication of EP1651373A1 publication Critical patent/EP1651373A1/fr
Publication of EP1651373A4 publication Critical patent/EP1651373A4/fr
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Publication of EP1651373B1 publication Critical patent/EP1651373B1/fr
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    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0671—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for heating or drying

Definitions

  • the present invention relates to a continuous casting method. It also relates to a continuous casting apparatus suitable for performing the continuous casting method.
  • a properzi method is known.
  • a casting space is formed between a groove formed on a peripheral surface of a casting wheel and an endless belt fitted on the groove.
  • Molten metal is supplied to the casting space when the casting wheel and the endless belt are rotating to continuously manufacture a cast member.
  • the casting wheel and the endless belt are cooled, and therefore the molten metal supplied to the casting space will be gradually solidified from the entire circumference thereof toward the central portion thereof (see, e.g., Japanese Unexamined Laid-open Patent Publication No. S53-123332 and Japanese Unexamined Laid-open Patent Publication No. S59-193737 ).
  • the final solidification portion will be positioned at the central portion of the cast member, and therefore shrinkage cavities and/or breakages tend to be generated at the central portion due to the solidification shrinkage. Accordingly, in the cast member having such defects, even if the cast member is subjected to plastic working such as rolling, extruding or drawing, the end product will contain the cast defects.
  • US 3 587 717 discloses a continuous casting method for continuously manufacturing a cast member by driving a plurality of rotational molding members disposed so as to form a casting space.
  • JP 10 317 084 discloses an endless belt moved in contact with rotating wheel having a groove in the outside peripheral surface to form a moving mold between the groove and the endless belt.
  • a continuous casting method as claimed in claim 1 is provided.
  • a continuous casting apparatus according to the present invention is defined in claim 7.
  • the dependent claims show some examples of such a casting method or apparatus, respectively.
  • the preferred embodiments of the present invention have been developed in view of the above-mentioned and/or other problems in the related art.
  • the preferred embodiments of the present invention can significantly improve upon existing methods and/or apparatuses.
  • some embodiments can provide a continuous casting method capable of reducing an influence of cast defects which may be generated in a cast member on a worked article by shifting the final solidification portion from the central portion of the cast member
  • some embodiments can provide a cast member manufactured by the aforementioned continuous casting method.
  • some embodiments can provide a metal worked article made of the aforementioned cast member
  • some embodiments can provide a continuous casting apparatus for performing the aforementioned continuous casting method.
  • the continuous casting method comprises a structure as recited in the following Items (1) to (7).
  • a cast member may be produced which has a structure as recited in the following Item (9) or (10).
  • a metal worked article may be produced having a structure as recited in the following Item (11).
  • a continuous casting apparatus comprises a structure as recited in the following Item (12) or (13).
  • the continuous casting method of the present invention since the plurality of rotational molding members are differentiated in temperature, a cast member in which the final solidification portion is displaced toward the side of the rotational molding member with higher temperature can be manufactured.
  • the cast defects can be removed by removing the surface layer portion. Cast defects existing at a portion near the surface will be disappeared or reduced by plastic working, whereby no cast defect will be included in a worked article.
  • the portion of one of the plurality of rotational molding members which starts to come into contact with the molten metal is set to a temperature of [(melting point or liquidus temperature of the metal) x 0.5] or more, the displacement of the final solidification portion becomes large, which causes the final solidification to be formed at a portion near the surface of the cast member.
  • the temperature of the portion of one of the plurality of rotational molding members is set by heating the portion before the portion starts to come into contact with the molten metal, the temperature of the portion can be set to a prescribed temperature.
  • the plurality of rotational molding members are a casting wheel with a groove formed on an external peripheral surface thereof and an endless belt put on the casting wheel so as to close the groove, a cast member in which the final solidification portion is displaced can also be manufactured more smoothly.
  • an aluminum or aluminum alloy cast member in which the final solidification portion is displaced can also be manufactured more smoothly.
  • a copper or copper alloy cast member in which the final solidification portion is displaced can also be manufactured more smoothly.
  • the cast member produced according to the method of the present invention is a cast member continuously cast by the aforementioned method, and the final solidification portion is located within a depth from a surface of the cast member, the depth being [(thickness of the cast member) x 0.2] or less.
  • the cast defects can be removed by removing the surface layer portion. Cast defects existing at a portion near the surface will be disappeared or reduced by plastic working, whereby no cast defect will be included in a worked article.
  • the metal worked article is an article obtained by performing plastic working to the cast member, it is free from cast defects and high in quality.
  • the continuous casting apparatus includes a plurality of rotational molding members disposed so as to form a casting space, the rotational molding members being driven in a direction of casting, a heating device which is configured to heat some of the rotational molding members, and a cooling device which is configured to cool the other of the rotational molding members. Therefore, by performing the continuous casting method of the present invention, a cast member in which the final solidification portion is displaced can be manufactured.
  • the temperature of the some of the rotational molding members can be set to a prescribed temperature.
  • a plurality of rotational molding members disposed so as to form a casting space are differentiated in temperature to thereby differentiate the solidification rates in the cast member, so that the final solidification portion is shifted from the central portion of the cast member toward the slow solidification rate side, i.e., toward the side of the rotational molding portion with higher temperature.
  • Figs. 1 and 2 show a continuous casting apparatus 1 for performing a continuous casting method according to the present invention.
  • this continuous casting apparatus 1 a pair of rolls 10 and 11 are disposed in parallel with each other at a roll surface distance T, and holding plates 12 and 13 for holding molten metal M are disposed between these rolls 10 and 11 at a distance W.
  • the rolls 10 and 11 and the holding plates 12 and 13 form a casting space 14. Accordingly, in this continuous casting apparatus 1, a rectangular cast member S1 having a cross-section of T x W can be continuously manufactured.
  • the pair of rolls 10 and 11 are configured such that the respective inner peripheries can be cooled by cooling water supplied via nozzles (not shown), and one of the rolls is configured such that the external periphery thereof can be heated with a burner 15 provided outside the roll 11 and positioned immediately before the roll 11 comes into contact with the molten metal M at the molten metal M supplying side.
  • the molten metal M supplied from the tundish 16 to the casting space 14 is continuously formed into a cast member S1 and transferred while being solidified from the roll contact surface to the inside by being cooled by the rolls 10 and 11.
  • the molten metal at the side of the heated roll 11 will be hardly cooled, while the solidification at the side of the cooled roll 10 will be enhanced. Accordingly, the final solidified portion F1 will be located at the side of the heated roll 11.
  • Figs. 3 and 4 schematically show a continuous casting apparatus 2 for performing a continuous casting method of the present invention.
  • the continuous casting apparatus 2 is provided with a casting wheel 20 and an endless belt 21.
  • the casting wheel 20 is provided with a groove 22 formed on the external surface and can be cooled by cooling water supplied from nozzles 23 provided within the wheel 20.
  • the endless belt 21 is put on the casting wheel 20 and a tension adjusting wheel 24 so as to close the groove 22 of the casting wheel 20, thereby forming a casting space 25.
  • the belt 21 is capable of being heated with a burner 26 immediately before the belt comes onto contact with the casting wheel 20.
  • the reference numeral 27 denotes a pinch roll for pressing the belt 21 on the casting wheel 20.
  • the reference numeral 28 denotes a tundish for supplying molten metal M to the casting space 25.
  • the molten metal M supplied from the tundish 28 to the casting space 25 is continuously formed into a cast member S2 in accordance with the rotation of the casting wheel 20 and the belt 21 while being solidified from the contact surface to the inside by being cooled by the casting wheel 20 and the belt 21.
  • the molten metal M will be hardly cooled at the side of the belt 21, and the solidification will be enhanced at the side of the casting wheel 20. Accordingly, the final solidification portion F2 will be located at the side of the belt 21 ( Fig. 5 ).
  • the belt 21 can be cooled for the purpose of preventing the breakage of the belt 21.
  • the rotational molding member 11 (21) to be set at higher temperature is heated, while another rotational molding member 10 (20) to be set at lower temperature is cooled in the same manner as a conventional continuous casting method, to thereby attain the solidification of the molten metal by cooling from one direction.
  • the temperature of the rotational molding member 11(21) at the higher temperature side is set depending on the casting metal, preferably set to a temperature of [(melting point or liquidus temperature of the metal) x 0.35] or more.
  • the preferable temperature is a temperature of [(melting point or liquidus temperature of the metal) x 0.5] or more, and more preferably, [(melting point or liquidus temperature of the metal)] x 0.6 or more.
  • the temperature is 230 °C or more, preferably 330 °C or more, more preferably 400 °C or more.
  • the temperature is 380 °C or more, preferably 540 °C or more, more preferably 650 °C or more.
  • the aforementioned temperature i.e., the temperature of the rotational molding member 11(21) at the higher temperature side, is defined as a temperature at the portion R1(R2) where the rotational member 11(21) starts to come into contact with the molten metal M.
  • the driving rotational molding member 11(21) is slightly different in temperature between when the member 11(21) starts to come into contact with the molten metal M and when the casting is completed, solidification control with higher precision can be performed by performing thermal management at the portion R1(R2) where the molding member 11(21) starts to come into contact with the molten metal M in which the solidification rate is directly influenced.
  • a means for setting the rotational molding member 11(21) to a prescribed temperature is not limited to the aforementioned burner 15(26), and any known heating means or a combination thereof can be used.
  • a means for cooling the other rotational molding member 10(20) is not limited to water, and any known cooling means or a combination thereof can be used.
  • the rotational molding members are not limited to the aforementioned pair of rolls 10 and 11 or the aforementioned combination of the casting wheel 20 and the endless belt 21.
  • the aforementioned molding members are rotational molding members which have been conventionally used for continuous casting.
  • the continuous casting method according to the present invention can be carried out by simply adding a heating means to the conventional rotational molding members to manufacture a cast member in which the final solidification portion is displaced.
  • at least two rotational molding members are required, and the number of rotational molding members can be 3(three) or more. In cases where 3(three) or more rotational molding members are used, the number of members to be heated and the number of members to be cooled can be arbitrarily set.
  • the present invention can be applied to various metal continuous casting, especially to aluminum or its alloy continuous casting or copper or its alloy continuous casting.
  • a cast member is manufactured by the aforementioned continuous casting method.
  • the final solidification portion F1 (F2) is displaced from the central portion of the cast member to within a depth from the surface of the cast member S1(S2) due to the temperature differences between the rotational molding members, wherein the depth is obtained by multiplying the thickness of the cast member S1(S2) by 0.2.
  • cast defects such as shrinkage cavities and/or shrinkage cracks may sometimes be generated.
  • the surface layer portion including the defects can be easily removed by cutting or the like.
  • an amount to be removed is not limited. It is not always necessary to completely remove the final solidification portion. In cases where plastic processing is followed, the removal can be performed up to the vicinity of the final solidification portion in consideration of disappearance or reduction of cast defects due to the following plastic working. Of course, the present invention allows complete removal of the final solidification portion. As shown in Fig. 5 , in the cast member S2 manufactured by using the endless belt 21, the final solidification portion F2 tends to be located at the central portion of the cast member S2 in the width direction or therearound. In such a case, there is no need to remove the entire region of the surface layer portion along the width direction at an even depth to obtain a flat surface. Instead, the vicinity of the final solidification portion F2 can be removed in the shape of "V" or "U.”
  • a metal worked article manufactured according to the present invention is an article manufactured by subjecting the cast member to plastic working, and is free from cast defects and high in quality.
  • the plastic working method is not limited to a specific one, and any known plastic working such as rolling, extruding, drawing, forging, bending or pressing can be employed.
  • the shape of the worked article is not limited.
  • a continuous casting apparatus is required to equip the aforementioned plurality of rotational molding members, heating means and cooling means.
  • structures of another means such as a means for supplying molten metal or a means for transferring the cast metal are not limited, and any know means and structure can be arbitrarily employed.
  • Example 1 a continuous casting test was carried out with respect to Al-Mn series alloy, JIS A3003 (liquidus temperature: 654°C), by using the continuous casting apparatus 1 shown in Figs. 1 and 2 .
  • the pair of rolls 10 and 11 each having a diameter of 300 mm were disposed at a surface distance T of 6 mm.
  • the distance W between the holding plates 12 and 13 was set to 100 mm.
  • a cast member S1 with a thickness of 6 mm and a width of 100 mm was continuously cast.
  • One of the rolls 10 was cooled, while the other was heated with the burner 15 so that the portion R1 of the roll 10 that starts to come into contact with the molten metal M was set to 500 °C.
  • the cross-section of the cast member S1 was observed. The observation revealed that the final solidification portion F1 was located at 1 mm depth from the surface at the side of the heated roll 10 and cast defects were generated. However, since the cast defects were located at 1 mm depth with respect to the 6 mm thick cast member S1, the cast defects could be easily removed.
  • the manufactured cast member S1 can be rolled into a rolled material with a prescribed thickness, and further can be subjected to press working.
  • a cast member was continuously cast in the same manner as in Example 1, except that both the rolls 10 and 11 were cooled by water.
  • the final solidification portion F1 was located at the central portion in the thickness direction, and shrinkage cavities were generated. Since the position of the shrinkage cavities was located at the central portion in the thickness direction, it was essentially impossible to remove them.
  • Example 2-1 and 2-2 continuous casting tests were carried out with respect to Al-Si-Mg series alloy, JIS A6061 (liquidus temperature: 652°C), by using the continuous casting apparatus 2 shown in Figs. 4 and 5 .
  • the casting wheel 20 having a diameter of 1400 mm, a depth D of a groove 22 of 55 mm, an inner cross-sectional area of the groove 22 (i.e., cross-sectional area of the casting space 25) of 2300 mm 2 was used.
  • Example 2-1 and 2-2 the casting wheel 20 was cooled, while the belt 21 was heated with the burner 26 so as to set the temperature of the portion R2 of the belt 21 which starts to come into contact with the molten metal M to the temperature shown in Table 1.
  • nozzles (not shown) for supplying cooling water to the outside of the belt 21 on the casting wheel 20 were added, so that the casting wheel 20 and the belt 21 were cooled by water.
  • the wheel rotating speed was set to 1.8 rpm during the casting process to continuously cast the cast member S2.
  • the cross-section of each cast member S2 was observed. The observation revealed that the final solidification portion F2 was located at the depth shown in Table 1 from the surface and cast defects were generated at the final solidification portion F2 and the vicinity thereof.
  • each cast member S2 was roughly rolled into a round bar having a diameter of 23 mm.
  • the final solidification portion F2 was located at the position shown in Table 1 from the surface of the round bar.
  • Table 1 Belt temperature Position of the final solidification portion of the cast member Depth from the surface Position of the final solidification portion of the round bar Depth from the surface Example 2-1 300 °C 7 mm 3 mm
  • Crystallized substances was large such as about 5 ⁇ m at the final solidification portion and therearound of the aforementioned roughly worked round bar, but small such as 3 ⁇ m or less at portions other than the above.
  • the roughly worked round bar can be further subjected to rolling, continuous extruding such as a comform extruding, drawing or forging to obtain a desired article.
  • the present invention relates to a continuous casting method using rotational molding members, and can be utilized for manufacturing metal cast members to be subjected to plastic working such as rolling, extruding, drawing or forging.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Le procédé de coulage en continu selon la présente invention assure le déplacement de la partie de solidification finale depuis la partie centrale de l'élément coulé afin de réduire l'influence des défauts de coulage qui peuvent être produits sur un article façonné en plastique. Dans un procédé de coulage en continu utilisé pour produire en continu un élément coulé au moyen de la commande d'une pluralité d'éléments de moulage en rotation disposés de manière à former un espace de coulage, les nombreux éléments de moulage en rotation ont une température différente. Dans une forme de réalisation préférée, une partie d'un des éléments de moulage en rotation qui commence à se trouver en contact avec le métal fondu, est déterminée à une température égale ou supérieure à : [point de fusion ou température dite 'Liquidus'' du métal) x 0,35] et l'autre partie des éléments de moulage en rotation est refroidie.

Claims (8)

  1. Procédé de coulée en continu pour fabriquer en continu un élément coulé par entraînement d'une pluralité d'éléments de moulage par rotation disposés de façon à former un espace de coulée, caractérisé en ce qu'une portion de l'un des éléments de moulage par rotation qui commence à venir en contact avec du métal fondu est chauffé par un dispositif de chauffage, qui n'est pas constitué de manière à chauffer le métal fondu, à une température de [(point de fusion ou température de liquidus du métal) x 0,35] ou plus, et dans lequel les autres éléments de moulage par rotation sont refroidis de sorte que la pluralité d'éléments de moulage par rotation présente une différence de température au niveau de la portion où les éléments de moulage par rotation commencent à venir en contact avec le métal fondu.
  2. Procédé de coulée en continu selon la revendication 1, dans lequel la portion de l'un parmi la pluralité d'éléments de moulage par rotation qui commence à venir en contact avec le métal fondu est réglée à une température de [(point de fusion ou température de liquidus du métal) x 0,5] ou plus.
  3. Procédé de coulée en continu selon l'une quelconque des revendications 1 et 2, dans lequel la pluralité d'éléments de moulage par rotation est constituée d'une paire de rouleaux disposés à une certaine distance.
  4. Procédé de coulée en continu selon l'une quelconque des revendications 1 et 2, dans lequel la pluralité d'éléments de moulage par rotation est constituée d'une roue de coulée avec un sillon formé sur une surface périphérique externe de celle-ci et d'une courroie sans fin placée sur la roue de coulée de façon à fermer le sillon.
  5. Procédé de coulée en continu selon l'une quelconque des revendications 1 à 4, dans lequel le métal est l'aluminium ou un alliage de celui-ci.
  6. Procédé de coulée en continu selon l'une quelconque des revendications 1 à 4, dans lequel le métal est le cuivre ou un alliage de celui-ci.
  7. Dispositif de coulée en continu propre à être utilisé dans le procédé de la revendication 1, comprenant :
    une pluralité d'éléments de moulage par rotation disposés de façon à former un espace de coulée, les éléments de moulage par rotation étant entraînés dans la direction de la coulée ;
    un dispositif de chauffage qui est configuré de manière à chauffer l'un des éléments de moulage par rotation ; et
    un dispositif de refroidissement qui est configuré de manière à refroidir les autres éléments de moulage par rotation.
  8. Dispositif de coulée en continu selon la revendication 7, dans lequel le dispositif de chauffage est disposé en avant d'une position où certains des éléments de moulage en rotation commencent à venir en contact avec du métal fondu.
EP04771114A 2003-07-23 2004-07-23 Procede de coulage en continu, element coule, article fa onne en metal et appareil de coulage en continu Not-in-force EP1651373B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2003278297 2003-07-23
US49051203P 2003-07-29 2003-07-29
PCT/JP2004/010977 WO2005007321A1 (fr) 2003-07-23 2004-07-23 Procede de coulage en continu, element coule, article façonne en metal et appareil de coulage en continu

Publications (3)

Publication Number Publication Date
EP1651373A1 EP1651373A1 (fr) 2006-05-03
EP1651373A4 EP1651373A4 (fr) 2009-10-28
EP1651373B1 true EP1651373B1 (fr) 2012-03-28

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EP (1) EP1651373B1 (fr)
CA (1) CA2532421A1 (fr)
WO (1) WO2005007321A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1243351A (en) * 1967-10-25 1971-08-18 Matsushita Electric Ind Co Ltd An apparatus for producing grids of storage batteries
US3575231A (en) * 1968-01-25 1971-04-20 Southwire Co Method and apparatus for injecting thermal conducting in a band wheel continuous casting shrinkage gap
US3759314A (en) * 1971-08-26 1973-09-18 Southwire Co High capacity continuous casting method
JPH04138846A (ja) * 1990-09-28 1992-05-13 Nippon Steel Corp 異なる溶融体から急冷凝固クラッド箔を製造する方法
JP3022277B2 (ja) * 1995-09-26 2000-03-15 古河電気工業株式会社 ベルトホイール式連続鋳造機用注湯ノズル
JPH10317084A (ja) * 1997-05-20 1998-12-02 Furukawa Electric Co Ltd:The Ａｌ−Ｚｒ系合金およびその製造方法

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EP1651373A1 (fr) 2006-05-03
WO2005007321A1 (fr) 2005-01-27
EP1651373A4 (fr) 2009-10-28
CA2532421A1 (fr) 2005-01-27

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