EP0743114B1 - Procédé de lubrification des parois d'une lingotière de coulée continue des métaux et lingotière pour sa mise en oeuvre - Google Patents
Procédé de lubrification des parois d'une lingotière de coulée continue des métaux et lingotière pour sa mise en oeuvre Download PDFInfo
- Publication number
- EP0743114B1 EP0743114B1 EP96400896A EP96400896A EP0743114B1 EP 0743114 B1 EP0743114 B1 EP 0743114B1 EP 96400896 A EP96400896 A EP 96400896A EP 96400896 A EP96400896 A EP 96400896A EP 0743114 B1 EP0743114 B1 EP 0743114B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- lubricant
- tubular element
- mould
- solidification
- 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
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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
- B22D11/07—Lubricating the moulds
Definitions
- the invention relates to the field of continuous casting of metals. More specifically, it concerns the lubrication mode of the ingot molds of conventional continuous casting, and also ingot molds for so-called “casting" installations continuous in charge ", in which one seeks to distance the surface of the liquid metal in an ingot mold in the area where solidification of the cast product begins.
- Document EP-A-0 160 635 on which the the preambles of claims 1 and 4 are based, describes the injection of a lubricant in the form initially solid.
- the conventional continuous casting operation of steel schematically consists of continuously pour molten metal into a vertical tubular oscillating ingot mold bottomless, with metal walls (copper or copper alloy) energetically cooled by internal circulation of water, and to extract, also continuously, a product (slab, bloom or billet depending on the dimensions of the mold) already solidified externally a few centimeters thick.
- the solidification of this product ends in the lower stages of the machine, where the product is first, at its exit of the mold, forcibly cooled by spraying water, then cools naturally. It is then cut to the desired length.
- the oscillation of the The function of the ingot mold is to prevent the solidified skin of the product from sticking locally on the wall of the mold, which would tear the skin causing a "breakthrough", ie the flow of liquid metal through this tear.
- the consequence of such an incident would be the need to immediately stop the pouring, and the risk of cause serious damage to the machine.
- a known remedy for this problem is to remove the surface of the liquid metal in an ingot mold of the level where solidification of the product is initiated.
- This being made of a heat insulating material such as an aluminous refractory the solidification of the skin of the product does not start in principle not on its walls, and begins only at the metal element.
- the fluctuations in the level of the liquid metal surface no longer affect the area where solidification begins. This is done very regularly and leads to a surface and subcutaneous quality of products significantly improved compared to conventional continuous casting systems. Such facilities are usually designated by the term "continuous casting under load”.
- the submerged nozzle which brings the metal liquid in the mold, with its open end held inside the riser.
- the metal that it contains therefore constitutes a buffer volume which absorbs the turbulence due to the incoming metal flow, before it reaches the level of the metal element. It also helps to provide greater regularity the solidification of the first layers of metal than in the case of continuous casting classics, where this turbulence affects the entire upper part of the element cooled metal and can slow solidification in the vicinity of strong areas recirculations.
- Moon consists in depositing on the surface of the liquid metal a powder based covering oxides and fluxes. It forms a liquid layer at its interface with the metal, and, at the periphery of the mold, this liquid which the composition of the powder gives lubricating properties seep between the wall and the solidified skin. Furthermore, this powder ensures the capture of non-metallic inclusions which have risen to the surface of metal, protection of the liquid metal against atmospheric reoxidation and a stopping the radiation emitted by the metal.
- composition of the powder which governs in particular its fluidity at the powder / metal interface, are not identical for all these functions.
- the choice of composition is therefore necessarily a compromise that does not optimally ensure any of they.
- the other method of lubrication is to deposit on the surface of the metal in ingot mold a layer of oil, such as rapeseed oil, so that it seeps between the wall and skin solidified. This provides very good quality lubrication, but the functions of trapping inclusions, of protecting the metal against reoxidation and radiation arrest are no longer guaranteed.
- This method is therefore hardly used only on very small format jet casting plants free (without submerged nozzle). On such installations, if a powder of cover, the impact of the casting spray on the metal surface would cause a entrainment of the powder inside the mold, and therefore serious pollution of the metal.
- the first cannot be transposed to the case of casting under load.
- the powder to be deposited on the surface of the metal in the extension to protect the metal and catch inclusions cannot reach the edge upper part of the metallic element, where the solidification of the skin begins, and therefore has no no role in lubrication.
- it is not conceivable to inject powder at the junction between the extension and the metal element because would cause pollution of the metal by the fraction of the powder which, inevitably, would be drawn into it.
- We therefore choose to provide lubrication of the mold by an oil injection carried out on the internal periphery of the metallic element, at neighborhood of its junction with the extension. It is carried out thanks, for example, to a cooled metal insert provided with a slot, interposed between them.
- the object of the invention is to propose a method making it possible to carry out a optimal lubrication of the entire cooled metal part of the ingot mold any continuous casting installation, in that it would make it possible in all cases the use of a liquid lubricant on a conventional continuous casting, and in that it would simplify the design of molds for continuous casting under load.
- the subject of the invention is a method of lubricating an ingot mold for continuous casting of a metallic product of the type comprising a tubular element vertically oscillating metal energetically cooled, defining a passage for the cast metal, and intended to cause contact with its wall in said passage the solidification of said metal product, according to which an injection of a lubricant in the liquid state through said metallic tubular element towards said metallic product in the course of solidification, characterized in that said injection is performed at points distributed annually on a single level of said element tubular, said level being located at a distance greater than 20 cm from the most bottom where is likely to initiate the solidification of said product, and in that the flow of said lubricant is sufficient to cause a rise of a fraction of said lubricant along said wall to the level where solidification actually begins of said product.
- the invention also relates to an ingot mold for an installation of continuous casting of metallic products, of the type comprising a tubular element energetically cooled metallic, defining a passage for the cast metal, and intended to cause solidification of said wall in contact with said passage metallic product, means for vertically oscillating said ingot mold, and means for injecting a lubricant in the liquid state through said element metallic tubular in the direction of said metallic product being solidified, characterized in that said means are placed at a single level of said element tubular metal, said level being located at a distance greater than 20 cm from the lowest level where solidification of said product is likely to begin.
- the invention consists in locating the injection of liquid lubricant at a level of the mold located very significantly lower than the level at which solidification of the cast product begins, and not at this level itself.
- the the inventors have, in fact, found that the vertical oscillating movements of the ingot mold could be sufficient to cause a significant rise in fraction of the lubricant along the walls of the cooled metal element.
- By adjusting from adequately the location and parameters of the lubricant injection so it is possible to send a significant quantity up to the level where the solidification, and thus ensure satisfactory lubrication of the mold on the entire height of its cooled metal element just with this injection. This quantity must, on the other hand, be moderate enough not to cause unacceptable gas emissions in the mold.
- the mold 1 shown in Figure 1 is, as is conventional in casting continuous in charge of steel or other metals, composed of two elements superimposed.
- the main one is a metallic tubular element 2 made of copper or an alloy of copper, the internal surface 3 of which defines a passage 4 of dimensions identical to those of the product to be poured, and of round, square or rectangular.
- This metallic tubular element 2 can consist of a single piece (this is most often the case for the casting of rounds, billets and steel blooms), or be formed by an assembly of plates each of which corresponds to one face of the ingot mold 1 (general case for casting steel slabs).
- the metallic tubular element 2 is cooled by a circulation of water 5, provided by example between its external surface 6 and a shirt 7 which surrounds it.
- an extension 9 formed by a tubular element of a refractory material such than a 90-10% alumina-silica mixture.
- the internal surface 10 of the extension 9 defines a passage 11 located in the extension of passage 4 defined by the internal surface 3 of the metallic tubular element 2.
- these two passages 4 and 11 have the same dimensions, but one of them can be expected to have a size smaller than the other, to make the start of solidification of the product more frank sunk.
- a submerged nozzle 12 connected to a distributor not shown containing the liquid metal 13 to flow causes the latter in the internal passage 11 to the extension 9.
- Product 1 then completes its solidification and cooling by simple convection and radiation.
- the ingot mold 1 also includes, so conventional, a device not shown making it possible to print all of vertical oscillation movements according to arrow 17. These oscillations can be sinusoidal or obey a more complex law. They usually have a frequency of a few Hz, and an amplitude of a few mm.
- the ingot mold 1 also comprises a device ensuring the lubrication of the internal surface 3 of the cooled metallic tubular element 2, by injection on the around this surface of a lubricating liquid, such as oil, intended to be inserted between this surface 3 and the solidified crust 14 of the product 16.
- a lubricating liquid such as oil
- This injection is carried out by channels 18, 19 formed in the walls of the metal element 2, and leading the lubricant up to orifices 20, 21 opening onto the internal surface 3 of this element 2, so as to distribute it over the entire periphery of the solidified crust 14 of the product 16.
- the lubricant is itself brought into the channels 18, 19 by means which are not shown connected to the lower orifices 22, 23 of the channels 18, 19, opening onto the lower edge 24 of the cooled metallic element 2.
- the conventional continuous casting installation according to the invention shown in the Figure 2 has its elements equivalent to elements of the same nature and the same function of the installation of Figure 1 identified by the same references.
- This installation is distinguishes from the previous one in that the cooled metallic tubular element 2 constitutes the entire internal face of the ingot mold 1. There is therefore no longer any extension heat insulating.
- the surface of the liquid metal 15 present in the mold 1 is maintained below the upper edge 8 of the metal element 2, and it is at its level that begins the solidification of the crust 14 of the product 16.
- the lubrication of the internal face of the mold 1 is entirely ensured by an injection of lubricating liquid carried out at a distance from the level where the solidification of the crust is initiated 14.
- this injection must be carried out at least 20 cm below the surface of the liquid metal 15. It is therefore necessary to place the lubricant injection device at the minus 20 cm below the lowest level at which the solidification of the product 16.
- the lubricant must also be injected at a rate such that, taking into account the other operating conditions, at all times a significant fraction lubricant rises along the walls of the cooled tubular element 2 to the level where the solidification of the product actually begins 16.
- FIG. 3 presents a more detailed view of a nonlimiting example of realization of the metal element 2 of the mold 1, rid of the jacket 7 which surrounds it when installed in the casting machine.
- This example is suitable for casting of steel products with a square cross section of 155 mm side.
- the channels 18, 18 ′ for supplying the lubricant are formed by longitudinal grooves machined on the external surface 6 of the metal element 2 in the extension of holes made in its lower edge 24 which constitute the lower orifices 22, 22 ', 23, 23' of the channels 18, 18 ', 19.
- channels 18, 18', 19 each open at their upper end into a distribution chamber 25, 25 'constituted by a recess machined transversely to the channel 18, 18', 19 corresponding on the external surface 6 of the metallic element 2, and which extends up to proximity of the edges 26, 27, 28 of said element 2.
- the bottom of each of these chambers distribution 25, 25 ' is pierced with a multiplicity of small holes 20, 20', 21 which open onto the internal face 3 of the metallic element 2 and constitute the orifices mentioned above which bring the lubricant between the metallic element 2 and the solidified crust 14 of the cast product 16.
- the channels 18, 18 ', 19 and the distribution chambers 25, 25', after machining, are closed tightly by covers (not shown) which are attached to the external face 6 of the metal element 2, for example through electron beam welding.
- This method of fixing has the advantage authorize the application of ultrasound to the mold 1 without deterioration of the seal cover-metal element connections 2, which would not be possible if this fixing was carried out using screws.
- ultrasound can known, contribute to improving the lubrication of the mold 1 and increase the efficiency of its cooling system.
- fine longitudinal grooves 29 are formed on the internal face 3 of the metallic element 2, between its lower edge 24 and the distribution 25, 25 'of the lubricant, in line with the orifices 20, 20', 21. These grooves facilitate the evacuation of excess lubricant and gases resulting from its cracking towards the lower part of the mold 2.
- Parameters to take into account for determining the optimal location injecting the lubricant into a mold of a given format are essentially the product casting speed 16, the amplitude and frequency of the oscillations of the ingot mold 1 and the flow of lubricant injected. All other things being equal, the lubricant rises along the metallic element 2 over a height all the more important that its flow is high and that the casting speed is low.
- the ingot mold 1 must therefore be designed so that, just by playing on the lubricant flow, it is possible to obtain correct lubrication of the entire mold 1 for all the operating conditions under which it is likely to be used.
Description
- la figure 1 qui représente schématiquement, vue en section longitudinale une installation de coulée continue en charge des métaux équipée d'une lingotière selon l'invention;
- la figure 2 qui représente de la même façon une installation de coulée continue classique équipée d'une lingotière selon l'invention;
- la figure 3 qui représente plus en détail un exemple d'élément tubulaire métallique d'une lingotière selon l'invention.
- longueur de l'élément métallique 2: 700 mm;
- section intérieure de l'élement métallique 2: carré de 155 mm de côté;
- épaisseur de la paroi de l'élément métallique 2: 11 mm;
- largeur des canaux 18, 18', 19 et diamètre de leurs orifices inférieurs 22, 22', 23, 23': 3 mm;
- distances entre les chambres de distribution 25, 25' et les arêtes de l'élément métallique 2: 10 mm;
- diamètre des orifices 20, 20', 21 d'amenée du lubrifiant sur la face interne de l'élément métallique 2: 0,5 mm;
- nombre de ces orifices 20, 20', 21: 28 pour chaque chambre de distribution 25, 25';
- distance entre ces orifices 20, 20', 21 et le bord supérieur 8 de l'élément métallique 2: 350 mm;
- dimensions des rainures longitudinales 29 d'évacuation du lubrifiant vers le bas de l'élément métallique 2: largeur 0,5 mm, profondeur 1 mm.
- suffisamment éloigné de l'extrémité supérieure 8 de l'élément refroidi 2, où s'initie la solidification de la croûte 14, afin d'éliminer les risques d'un craquage important du lubrifiant, que l'invention vise précisément à éviter;
- mais aussi suffisamment proche de cette même extrémité pour qu'une quantité adéquate de lubrifiant puisse y parvenir, compte tenu des autres conditions opératoires.
Claims (6)
- Procédé de lubrification d'une lingotière de coulée continue d'un produit métallique du type comportant un élément tubulaire métallique oscillant verticalement énergiquement refroidi, définissant un passage pour le métal coulé, et destiné à provoquer au contact de sa paroi dans ledit passage la solidification dudit produit métallique, selon lequel on effectue une injection d'un lubrifiant à travers ledit élément tubulaire métallique en direction dudit produit métallique en cours de solidification, caractérisé en ce que ladite injection d'un lubrifiant à l'état liquide est effectuée en des points répartis annulairement sur un niveau unique dudit élément tubulaire, ledit niveau étant situé à une distance supérieure à 20 cm du niveau le plus bas où est susceptible de s'initier la solidification dudit produit, et en ce que le débit dudit lubrifiant est suffisant pour provoquer une remontée d'une fraction dudit lubrifiant le long de ladite paroi jusqu'au niveau où s'initie effectivement la solidification dudit produit.
- Procédé selon la revendication 1, caractérisé en ce que ladite lingotière comporte une rehausse tubulaire en un matériau thermiquement isolant, disposée sur le bord supérieur dudit élément tubulaire métallique refroidi et dans son prolongement, en ce qu'on maintient la surface du métal coulé dans la lingotière à l'intérieur de ladite rehausse, et en ce qu'une fraction dudit lubrifiant remonte jusqu'au bord supérieur dudit élément tubulaire métallique refroidi.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que ledit lubrifiant est de l'huile.
- Lingotière (1) pour une installation de coulée continue de produits métalliques (16), du type comportant un élément tubulaire métallique (2) énergiquement refroidi, définissant un passage (4) pour le métal coulé, et destiné à provoquer au contact de sa paroi (3) dans ledit passage (4) la solidification dudit produit métallique (16), des moyens pour faire osciller verticalement ladite lingotière (1), et des moyens pour effectuer une injection d'un lubrifiant à travers ledit élément tubulaire métallique (2) en direction dudit produit métallique (16) en cours de solidification, caractérisée en ce que lesdits moyens pour effectuer une injection d'un lubrifiant à l'état liquide sont placés à un niveau unique dudit élément tubulaire métallique (2), ledit niveau étant situé à une distance supérieure à 20 cm du niveau le plus bas où est susceptible de s'initier la solidification dudit produit (16).
- Lingotière selon la revendication 4, caractérisée en ce qu'elle comporte une rehausse tubulaire (9) en un matériau thermiquement isolant, disposée sur le bord supérieur (8) dudit élément tubulaire métallique refroidi (2) et dans son prolongement, et en ce que lesdits moyens d'injection d'un lubrifiant à l'état liquide sont situés à au moins 20 cm en-dessous dudit bord supérieur (8).
- Lingotière selon la revendication 4 ou 5, caractérisée en ce que lesdits moyens d'injection d'un lubrifiant à l'état liquide comprennent des canaux (18, 18', 19) ménagés dans les parois de l'élément tubulaire métallique (2), et débouchant chacun dans une chambre de distribution (25, 25') percée d'une multiplicité de trous (20, 20') débouchant sur la face interne (3) de l'élément tubulaire métallique (2), et des moyens pour amener ledit lubrifiant dans lesdits canaux (18, 18', 19).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9505794A FR2734186B1 (fr) | 1995-05-17 | 1995-05-17 | Procede de lubrification des parois d'une lingotiere de coulee continue des metaux et lingotiere pour sa mise en oeuvre |
FR9505794 | 1995-05-17 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0743114A1 EP0743114A1 (fr) | 1996-11-20 |
EP0743114B1 true EP0743114B1 (fr) | 2000-09-13 |
EP0743114B2 EP0743114B2 (fr) | 2009-04-01 |
Family
ID=9479031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96400896A Expired - Lifetime EP0743114B2 (fr) | 1995-05-17 | 1996-04-26 | Procédé de lubrification des parois d'une lingotière de coulée continue des métaux et lingotière pour sa mise en oeuvre |
Country Status (10)
Country | Link |
---|---|
US (1) | US5682942A (fr) |
EP (1) | EP0743114B2 (fr) |
JP (1) | JPH09220645A (fr) |
KR (1) | KR100371413B1 (fr) |
CN (1) | CN1061575C (fr) |
AT (1) | ATE196269T1 (fr) |
CA (1) | CA2176843C (fr) |
DE (1) | DE69610249T3 (fr) |
ES (1) | ES2150084T5 (fr) |
FR (1) | FR2734186B1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1066898B1 (fr) * | 1999-07-06 | 2005-03-09 | SMS Demag AG | Procédé d'alimentation de métal liquide d'une machine de coulée continue |
KR100893642B1 (ko) * | 2001-08-06 | 2009-04-17 | 신토고교 가부시키가이샤 | 주형 조형기를 모니터링하는 방법 및 시스템 |
KR100895618B1 (ko) * | 2004-10-25 | 2009-05-06 | 쇼와 덴코 가부시키가이샤 | 연속 주조 장치, 연속 주조 방법 및 알루미늄 합금 주조봉 |
CN100418667C (zh) * | 2006-05-19 | 2008-09-17 | 苏州有色金属加工研究院 | 铝及铝合金半连铸连续润滑结晶器 |
CN106735013A (zh) * | 2016-11-16 | 2017-05-31 | 南京钢铁股份有限公司 | 一种提高大方坯头坯质量的连铸工艺 |
CN110681834B (zh) * | 2019-11-05 | 2023-09-19 | 中冶赛迪信息技术(重庆)有限公司 | 方坯连铸结晶器及冷却方法 |
CN111570738B (zh) * | 2020-06-12 | 2022-03-29 | 包头常铝北方铝业有限责任公司 | 一种改善5系铝合金扁锭表面质量的方法 |
EP4008451A1 (fr) * | 2020-12-07 | 2022-06-08 | Hertwich Engineering GmbH | Lingotière de coulée continue dotée d'un canal de lubrifiant débouchant dans la surface de roulement |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57103758A (en) * | 1980-12-18 | 1982-06-28 | Nippon Steel Corp | Mold for continuous casting |
BE899544A (fr) * | 1984-04-27 | 1984-08-16 | Centre Rech Metallurgique | Procede et dispositif pour la lubrification d'une lingotiere de couleecontinue. |
US5271452A (en) * | 1987-03-26 | 1993-12-21 | Sms Concast Inc. | Continuous casting method and apparatus |
JPH06104266B2 (ja) * | 1989-07-14 | 1994-12-21 | 住友金属工業株式会社 | 高速鋳造における鋳片の縦割れ防止方法 |
FR2672524B1 (fr) * | 1991-02-11 | 1993-05-28 | Siderurgie Fse Inst Rech | Lingotiere pour coulee continue de produits metalliques. |
FR2703609B3 (fr) * | 1993-03-30 | 1995-02-10 | Lorraine Laminage | Procédé de coulée continue en charge des métaux et lingotière pour sa mise en Óoeuvre. |
FR2704786B3 (fr) * | 1993-03-30 | 1995-03-10 | Lorraine Laminage | Procédé de coulée continue en charge des métaux, notamment de l'acier, et lingotière pour sa mise en Óoeuvre. |
FR2708222B3 (fr) * | 1993-06-30 | 1995-07-13 | Unimetall Sa | Lingotière de coulée continue des métaux notamment de l'acier, équipée de moyens de lubrification de sa face interne. |
-
1995
- 1995-05-17 FR FR9505794A patent/FR2734186B1/fr not_active Expired - Lifetime
-
1996
- 1996-04-26 ES ES96400896T patent/ES2150084T5/es not_active Expired - Lifetime
- 1996-04-26 EP EP96400896A patent/EP0743114B2/fr not_active Expired - Lifetime
- 1996-04-26 AT AT96400896T patent/ATE196269T1/de active
- 1996-04-26 DE DE69610249T patent/DE69610249T3/de not_active Expired - Lifetime
- 1996-04-29 US US08/638,749 patent/US5682942A/en not_active Expired - Lifetime
- 1996-05-16 CN CN96105860A patent/CN1061575C/zh not_active Expired - Lifetime
- 1996-05-16 CA CA002176843A patent/CA2176843C/fr not_active Expired - Lifetime
- 1996-05-17 JP JP8148142A patent/JPH09220645A/ja active Pending
- 1996-05-17 KR KR1019960016760A patent/KR100371413B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FR2734186A1 (fr) | 1996-11-22 |
DE69610249T3 (de) | 2010-04-15 |
CN1061575C (zh) | 2001-02-07 |
CN1145287A (zh) | 1997-03-19 |
EP0743114A1 (fr) | 1996-11-20 |
KR960040510A (ko) | 1996-12-17 |
ES2150084T3 (es) | 2000-11-16 |
EP0743114B2 (fr) | 2009-04-01 |
KR100371413B1 (ko) | 2003-04-08 |
ATE196269T1 (de) | 2000-09-15 |
JPH09220645A (ja) | 1997-08-26 |
FR2734186B1 (fr) | 1997-06-13 |
US5682942A (en) | 1997-11-04 |
DE69610249T2 (de) | 2001-04-26 |
CA2176843A1 (fr) | 1996-11-18 |
DE69610249D1 (de) | 2000-10-19 |
ES2150084T5 (es) | 2009-08-31 |
CA2176843C (fr) | 2008-01-08 |
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