EP3291931B1 - Crystallizer for continuous casting - Google Patents
Crystallizer for continuous casting Download PDFInfo
- Publication number
- EP3291931B1 EP3291931B1 EP16730484.9A EP16730484A EP3291931B1 EP 3291931 B1 EP3291931 B1 EP 3291931B1 EP 16730484 A EP16730484 A EP 16730484A EP 3291931 B1 EP3291931 B1 EP 3291931B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tubular body
- longitudinal
- crystallizer according
- crystallizer
- thickness
- 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.)
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- 238000009749 continuous casting Methods 0.000 title claims description 10
- 238000005266 casting Methods 0.000 claims description 21
- 230000005499 meniscus Effects 0.000 claims description 17
- 239000000110 cooling liquid Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910017526 Cu-Cr-Zr Inorganic materials 0.000 description 1
- 229910017770 Cu—Ag Inorganic materials 0.000 description 1
- 229910017810 Cu—Cr—Zr Inorganic materials 0.000 description 1
- 241000700608 Sagitta Species 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Images
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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/057—Manufacturing or calibrating the moulds
Definitions
- the present invention relates to a crystallizer for the continuous casting of billets or blooms of any type of section, preferably square, rectangular or round.
- crystallizers for continuous casting systems for blooms or billets in the prior art. These crystallizers substantially consist of a monolithic tubular body, generally made of copper, the cross section of which defines the shape of the cast product.
- a jacket is provided at the outer wall of a first type of crystallizer in which a cooling liquid, generally water, is allowed to flow.
- This type of crystallizer is used for casting molten metal at relatively slow speed, generally from 3 to 3.5 m/min. Many problems are found beyond this speed threshold, mainly due to:
- the present invention thus suggests to achieve the aforesaid objects by providing a crystallizer for continuous casting of blooms or billets, which according to claim 1 comprises:
- the crystallizer which is object of the present invention, allows to:
- a slightly outward bulging shape of the inner and outer surfaces of the first tubular body preferably made of copper or alloys thereof.
- Such an outward bulging shape defined by the contour on a horizontal plane of the inner and outer surfaces of the first tubular body promotes an outward widening of the first tubular body which is blocked, by virtue of the containment applied by the second tubular body, preferably made of steel.
- the wall of the first tubular body has an inner surface which, in contact with the molten steel, tends to expand with respect to the outer surface arranged in contact with the cooling liquid. If the wall of the first tubular body were flat, and not bulging outwards, the expansion of its inner surface, caused by heat, would make it curve inwards.
- the expansion of the inner surface of the wall promotes an expansion, but said expansion is directed outwards and in all cases contained by the second tubular body. Therefore, when casting molten metal, the inner surface of the casting tube is not deformed in the meniscus zone, thus maintaining an optimal contact with the molten metal inside and an efficient heat exchange. Substantially, during the casting, the casting tube tends to widen outwards in the meniscus zone, but, by virtue of the presence of the outer containing collar, it stops without being deformed.
- the casting tube may expand axially instead.
- the thickness of the first tubular body is advantageously of only 8-9 mm, and in all cases not greater than 10 mm.
- the thickness of the first tubular body is instead greater and can measure from 12 to 15 mm, thus ensuring an effective heat exchange in the surroundings of the cooling channels in all cases.
- Cooling channels are formed by fitting both the second body and the third body on the first body.
- the third body is a body distinct from the second body and is integrally fixed to said second tubular body by means of appropriate fixing means. Both the second body and the third body consist of two parts integrally fixed to each other, respectively.
- the third body and the second body are obtained together in a single tubular body, which is more rigid than the first body.
- Said single tubular body is externally provided with a shoulder at the passage from said first thickness to said second thickness.
- this single tubular body consists of two parts integrally fixed to each other.
- said single tubular body extending longitudinally about nearly as far as the first body, consists of two semi-collars which, by mating with each other, surround and support the first tubular body.
- All the embodiments of the crystallizer which is the object of the present invention, comprise: a tubular body or casting tube 1, defining a longitudinal axis X, the cross section of which, along a plane orthogonal to the longitudinal axis X, defines the shape of said blooms or billets, the molten metal being cast exclusively through said tubular body (1);
- the meniscus permanence zone during the continuous casting is, for example, identified in Figure 1 between lines 36 and 37, which indicate a maximum level and a minimum level of the meniscus during the casting, respectively.
- the tubular body 3 is a body distinct from the tubular body 2 and is integrally fixed thereto by means of fixing means.
- the tubular body 2 consists of two pieces or semi-collars integrally joined to each other by fixing means, e.g. bolts.
- fixing means e.g. bolts.
- the two half-collars 2', 2" are joined by means of bolts 31.
- the semi-collar 2" is provided with recesses 32 on the outer surface 34 for fixing said bolts 31.
- the tubular body 3 is arranged immediately underneath the tubular body 2 and is integrally fixed thereto.
- the upper end of the tubular body 3 is provided with an annular outer protrusion 10 ( Figures 1 , 4, 4a ) which acts as a connection with the tubular body 2.
- annular outer protrusion 10 Figures 1 , 4, 4a
- a mechanical connection is obtained by means of bolts 41 which cross respective holes 42 provided on said outer protrusion 10 along a circumference.
- the thickness of the tubular body 3 is constant, preferably except from the upper end provided with the outer annular protrusion 10, and of about 15-40% of the thickness of the tubular body 2.
- the thickness of the tubular body 3 gradually decreases from its upper end, proximal to the tubular body 2, to its lower end, distal from the tubular body 2.
- the tubular body 3 consists of two parts 33, 33' joined integrally to each other by means of fixing means, e.g. bolts, arranged along the longitudinal extension thereof.
- the two parts 33, 33' have a U-shaped cross section, as shown for example in Figure 5 and 5a , or as shown in Figures 4 and 4a (see the part inside dashed lines 70 which indicate the outer surface of the tubular body 3).
- Part 33 has a protruding edge 35 on its two ends ( Figures 5, 5a ) so as to mate with a corresponding protruding edge 35' provided at the two ends of part 33'.
- Bolts 71 are provided to tighten the protruding edges 35, 35' to each other and thus integrally fix the two parts 33, 33' of the tubular body 3 to each other.
- the tubular body 2 is fitted on the tubular body 1 with a very low clearance, e.g. equal to or smaller than 0.1 mm, thus without providing any mechanical connection means, such as for example screws, between tubular body 2 and tubular body 1. The tubular body 2 can thus be removed from the tubular body 1 and used again.
- tubular body 3 and tubular body 2 are obtained together in a single tubular body 20, thus with the same material externally provided with a shoulder 90 at the passage from the greater thickness of the body 2 to the smaller thickness of the body 3.
- the single tubular body 20 consists of two pieces, or semi-collars, integrally joined to each other by fixing means, e.g. bolts.
- a half-shoulder is provided in each half-collar at the passage from its upper portion, corresponding to half of the tubular body 2, to its lower portion, corresponding to half the tubular body 3.
- the upper portions of the two half-collars may be joined, for example, by means of bolts 31', being one of the two upper portions provided with recesses on its outer surface for fixing said bolts 31', in a manner similar to that shown in Figures 3 and 3a .
- the lower portions 73 of the two half collars may be for example joined integrally together by means of fixing means, such as bolts, arranged along their longitudinal extension.
- fixing means such as bolts
- One of the two lower portions has a protruding edge 75 on its two ends such to mate with a corresponding protruding edge provided at the two ends of the other lower portion.
- Bolts 71' are provided to fasten the protruding edges to each other, and thus integrally fix the two lower portions 73 of the two half-collars to each other in a manner similar to that shown in Figures 5 and 5a .
- the single tubular body 20 is fitted on the tubular body 1 with a very low clearance, e.g. either equal to or smaller than 0.1 mm, thus without providing any mechanical connection means, such as for example screws, between tubular body 20 and tubular body 1.
- the tubular body 20 can thus be removed from the tubular body 1 and used again.
- the thickness of the tubular body 1 is, instead, constant for its entire longitudinal extension.
- a thickness is only 8-9 mm, in all cases no greater than 10 mm, if a smooth tubular body 1, i.e. one with the outer smooth walls, free from grooves, is used ( Figure 2 ). If a tubular body 1 with grooved outer walls is used instead, the thickness is greater, e.g. 12-15 mm ( Figure 2a ).
- the tubular body 1 and the tubular body 3 have a quadrangular-shaped cross section, along a plane perpendicular to axis X.
- the tubular body 2 has, instead, a quadrangular plan inner surface and shape mating with the outer surface of the corresponding zone of the tubular body 1, while it has a circular or quadrangular outer surface.
- the thickness of the tubular body 3 is smaller ( Figures 4, 4a ) than the thickness of the tubular body 2, which is variable in cross section along a plane orthogonal to axis X, with the minimum value at the edges of the tubular body 1 ( Figures 3, 3a ).
- the thickness of the upper end of the tubular body 3, provided with annular protrusion 10, may be equal to the thickness of the tubular body 2 ( Figure 1 ).
- the outer and inner surfaces of the walls of the tubular body 1, seen along a plane orthogonal to longitudinal axis X, are concave surfaces with respect to the axis X itself.
- the slightly outward bulging shape of the inner and outer walls of the tubular body 1 promotes, during the casting, an outward widening of the tubular body 1, which is blocked by the presence of the tubular body 2 in particular at the meniscus permanence zone.
- the sagitta of the arc of circumference which describes the surrounding of the concave inner surfaces of the tubular body 1 on a horizontal plane, i.e. the distance between the mid point of said arc of circumference and the mid point of the subtended chord, is of about 1-5 mm.
- the tubular body 1 and the tubular body 3 have a round-shaped cross section, along a plane perpendicular to axis X.
- the tubular body 2 has a circular plan inner surface of shape mating the outer surface of the corresponding zone of the tubular body 1, preferably also it has a circular or quadrangular outer surface.
- the tubular body 1 is a monolithic body obtained by implosion on an appropriate die. It is preferably made of copper or alloys thereof, preferably Cu-Cr-Zr or Cu-Ag alloys.
- the rigidity of the tubular body 2 or of the aforesaid the single tubular body 20, preferably made of steel, is greater than that of the tubular body 1.
- the tubular body 1 is always made of a material which is less rigid than the material with which the tubular body 2 or the aforesaid single tubular body 20 are made.
- tubular body 2 is a substantially solid body, i.e. free from cavities inside its thickness.
- Introduction pipes 17, radial with respect to axis X, are provided to introduce a cooling liquid in the longitudinal channels 4, only at the upper end of the tubular body 2.
- Other small cavities are provided, in the case of tubular body 2 in two parts, for fixing the two parts or semi-collars by means of bolts 41.
- the outer surface of the tubular body 1 and the inner surface of the tubular body 2 define together longitudinal channels 4, parallel to each other and parallel to the longitudinal axis X, for the passage of a cooling liquid from the top downwards.
- the cooling liquid generally water, which flows in the longitudinal channels 4 at the meniscus zone, continues to flow between tubular body 1 and tubular body 3, in the zone under the meniscus zone, in respective extensions of said longitudinal channels 4.
- the tubular body 2 extends over a length from 15% to 50% of the total length of the tubular body 1 along the longitudinal axis X, preferably between 20% and 40%, and covers the upper part of the tubular body 1 near a first end thereof.
- the longitudinal channels 4 are defined at the meniscus zone by a plurality of longitudinal grooves 6, made only on the inner walls of the tubular body 2 and along all its longitudinal extension, said longitudinal grooves 6 being closed by respective outer walls of the tubular body 1.
- the tubular body 3 is coaxial and externally adjacent to the tubular body 1 and there are provided further longitudinal grooves 8, made on the inner walls of the tubular body 3 and along all its longitudinal extension.
- These further longitudinal grooves 8, corresponding in number and position to the longitudinal grooves 6, are closed by the outer walls of the tubular body 1 ( Fig. 4 and 5 ) and define an extension of said longitudinal grooves 6.
- the longitudinal grooves 8 have a cross section equal to that of the corresponding longitudinal grooves 6.
- the grooves 6 have a substantially rectangular cross section, preferably ( Fig. 2 and 3 ) with a longer side of the channels 4 in contact with the wall of the tubular body 1 and the two shorter sides substantially perpendicular to said wall.
- This solution indeed further improves heat exchange.
- the above applied to grooves 6 may also apply to the grooves 8 underneath, as shown in Figure 4 and 5 , for example.
- the channels 4 are obtained with flat rectangular cross section, i.e.
- the number of grooves 6 is odd, e.g. five as in the Figures, so that, in the case of tubular body 2 made of two parts joined together, the central groove at the two opposite sides of the tubular body 1 is obtained half on the first half-collar 2' and half on the second half-collar 2".
- the number of the corresponding grooves 8 is odd, so that in case of tubular body 3 made of two parts joined to each other, the central groove at the two opposite sides of the tubular body 1 is obtained half on the first part 33 and half on the second part 33'.
- Another alternative solution is that wherein the shorter side of the channels 4 is in contact with the wall of the tubular body 1 and the longer two sides are substantially perpendicular to said wall.
- longitudinal grooves may be provided at the inner edges of the tubular body 2, and also at the inner edges of the tubular body 3 underneath.
- the longitudinal channels 4 are defined by a plurality of longitudinal grooves 6', made only on the outer walls of the tubular body 1 both at tubular body 2 and at tubular body 3, said longitudinal grooves 6' being closed at the top by the inner walls of the tubular body 2 and at the bottom by the inner walls of the tubular body 3.
- the longitudinal grooves 6' have a substantially square-shaped cross section. Preferably, they are odd in number.
- All longitudinal grooves 6, 8, 6' of the various embodiments may have different shape providing they have good thermal exchange.
- the grooves may be semicircular, semioval or polygonal in shape, in addition to rectangular or square.
- All longitudinal grooves of the various embodiments of the invention have a longitudinal axis parallel to the longitudinal axis X of the tubular body 1.
- supporting flanges 11, 12 of the upper end of the tubular body or casting tube 1 and a supporting flange 13 of the upper end of the tubular body or collar 2 are provided.
- the supporting flanges 11, 12, 13 are arranged over one another and mutually connected together. Hydraulic sealing means are arranged therebetween them, e.g. O-ring 15, 16.
- Introduction pipes 17 for introducing the cooling liquid in the longitudinal channels 4 are provided in the supporting flange 13 and in the upper end of the tubular body 2.
- the supporting flanges 18, 19 are provided arranged on each other and mutually connected together. Hydraulic sealing means are arranged therebetween, e.g. O-ring 14.
- An outlet pipe 21 of the cooling liquid coming from the space between the tubular body 1 and the tubular body or conveyor 3, is provided in the upper supporting flange 18.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Continuous Casting (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
- The present invention relates to a crystallizer for the continuous casting of billets or blooms of any type of section, preferably square, rectangular or round.
- There are many crystallizers for continuous casting systems for blooms or billets in the prior art. These crystallizers substantially consist of a monolithic tubular body, generally made of copper, the cross section of which defines the shape of the cast product.
- In order to cool the molten metal during casting and to start the gradual solidification of the metal, a jacket is provided at the outer wall of a first type of crystallizer in which a cooling liquid, generally water, is allowed to flow.
- This type of crystallizer is used for casting molten metal at relatively slow speed, generally from 3 to 3.5 m/min. Many problems are found beyond this speed threshold, mainly due to:
- the high temperature gradients generated along the thickness and along the longitudinal extension of the monolithic tubular body by the high casting speed, which imply thermal stresses and an excessive deformation of the walls of the monolithic tubular body;
- a non-uniform cooling on the cross section, which in turn implies a non-controllable inner taper and which does not allow the monolithic tubular body to follow the shrinkage of the solidifying skin in a correct manner;
- a negative taper which is generated near the meniscus and which limits the effect of the lubrication and the casting speed;
- a limited duration caused by the cracks which are formed prematurely on the chromium coating in the meniscus zone;
- a poor surface quality of the cast product with the evident presence of oscillation marks;
- the formation of geometric defects, such as rhomboid error;
- the formation for structural defects, such as cracks near the edges or side walls, which may cause the breakage of the skin and the release of the still molten metal, etc.
- Many of these problems have been at least partially solved by a later generation of crystallizers which include through holes for the passage of the cooling liquid in the thickness of their wall. Thereby, a better heat transfer is obtained, while maintaining a good rigidity of the crystallizer in all cases.
- However, the known crystallizers have complex structures and, as a consequence, are costly to obtain.
-
- Furthermore, in the known crystallizers, even those of the latest generation, deformations which are difficult to control and which do not allow correct lubrication between wall and skin being formed are still formed at the meniscus zone, thus preventing the skin from following a regular solidification in a correct manner.
- It is an object of the present invention to provide a crystallizer having a casting tube of thin, constant thickness, which is structurally simple, so as to reduce its manufacturing costs in a considerable manner.
- It is another object of the invention to provide a crystallizer which, in addition to being cost-effective, allows casting speeds at least equal to those currently achieved by the known crystallizers without compromising the surface or internal quality of the cast product.
- The present invention thus suggests to achieve the aforesaid objects by providing a crystallizer for continuous casting of blooms or billets, which according to
claim 1 comprises: - a first monolithic tubular body for casting molten metal, defining a longitudinal axis X and having a cross section, along a plane orthogonal to the longitudinal axis X, adapted to define the shape of said blooms or billets, said first tubular body being the only tubular body of the crystallizer coming into contact with the molten metal;
- a second tubular body, coaxial and externally adjacent to said first tubular body, having a first thickness and arranged at a first zone of the first tubular body, corresponding to the zone in which the meniscus is permanently maintained during the continuous casting;
- a third tubular body, coaxial and external to said first said tubular body, having a second thickness smaller than said first thickness and arranged at a second zone of the first tubular body, corresponding to a zone that is lower and adjacent to said first zone;
- wherein an outer surface of the first tubular body together with both an inner surface of the second tubular body and an inner surface of the third tubular body define longitudinal channels, parallel to each other and parallel to the longitudinal axis X, for the passage of a cooling liquid,
- and wherein the second tubular body is more rigid than the first monolithic tubular body.
- Advantageously the crystallizer, which is object of the present invention, allows to:
- contain the plastic deformation of the first tubular body, or casting tube, by virtue of the presence of the second tubular body, or collar, at the meniscus formation zone, said second tubular body being robust, rigid and fitted on the first tubular body with a very contained clearance, e.g. either equal to or smaller than 0.1 mm;
- withstand the high thermal and mechanical stresses to which it is subjected, determining a long and efficient working life in practice;
- ensure good lubrication, e.g. by means of powders or oil, which limits the formation of localized cracks in the meniscus zone because of the strains and plastic deformation accumulated during the thermal cycles.
- In particular, in a preferred variant, there is provided a slightly outward bulging shape of the inner and outer surfaces of the first tubular body, preferably made of copper or alloys thereof. Such an outward bulging shape defined by the contour on a horizontal plane of the inner and outer surfaces of the first tubular body promotes an outward widening of the first tubular body which is blocked, by virtue of the containment applied by the second tubular body, preferably made of steel. Indeed, the wall of the first tubular body has an inner surface which, in contact with the molten steel, tends to expand with respect to the outer surface arranged in contact with the cooling liquid. If the wall of the first tubular body were flat, and not bulging outwards, the expansion of its inner surface, caused by heat, would make it curve inwards. Instead, by providing a slight outward bulge of the wall of the first tubular body, the expansion of the inner surface of the wall promotes an expansion, but said expansion is directed outwards and in all cases contained by the second tubular body. Therefore, when casting molten metal, the inner surface of the casting tube is not deformed in the meniscus zone, thus maintaining an optimal contact with the molten metal inside and an efficient heat exchange. Substantially, during the casting, the casting tube tends to widen outwards in the meniscus zone, but, by virtue of the presence of the outer containing collar, it stops without being deformed. Advantageously, the casting tube may expand axially instead.
- In case of smooth outer surface, i.e. free from grooves, the thickness of the first tubular body is advantageously of only 8-9 mm, and in all cases not greater than 10 mm.
- Instead, if the outer surface is provided with longitudinal grooves for the passage of cooling liquid, the thickness of the first tubular body is instead greater and can measure from 12 to 15 mm, thus ensuring an effective heat exchange in the surroundings of the cooling channels in all cases.
- Obtaining the longitudinal grooves by removing material, e.g. by means of milling, make the operations of obtaining the cooling channels simpler and more cost-effective. Such grooves may be obtained:
- only on a second tubular body, or containing collar, and on the third tubular body, or conveyor;
- only on the first tubular body, or casting tube;
- or both on the first tubular body, on one side, on the second tubular body and on the third tubular body, on the other side.
- Cooling channels are formed by fitting both the second body and the third body on the first body.
- In a first preferred embodiment, the third body is a body distinct from the second body and is integrally fixed to said second tubular body by means of appropriate fixing means. Both the second body and the third body consist of two parts integrally fixed to each other, respectively.
- In a second preferred embodiment, instead, the third body and the second body are obtained together in a single tubular body, which is more rigid than the first body. Said single tubular body is externally provided with a shoulder at the passage from said first thickness to said second thickness. Preferably, this single tubular body consists of two parts integrally fixed to each other. Substantially, said single tubular body, extending longitudinally about nearly as far as the first body, consists of two semi-collars which, by mating with each other, surround and support the first tubular body. Obtaining the second body with the third body in a single tubular body creates a rigid and non-deformable containing structure, which prevents the first tubular body from expanding transversely outwards and allows it to expand only longitudinally.
- The dependent claims describe preferred embodiments of the invention forming an integral part of the present description.
- Further features and advantages of the present invention will become more apparent in the light of the detailed description of a preferred, but not exclusive, embodiments of a crystallizer shown by way of non-limitative example, with reference to the accompanying drawings, in which:
-
Fig. 1 is a section view of a first embodiment of a crystallizer according to the invention; -
Fig. 1a is a section view of a second embodiment of a crystallizer according to the invention; -
Fig. 2 is a cross section view taken along plane A-A of the crystallizer inFig. 1 ; -
Fig. 2a is a section view taken along plane A'-A', corresponding to plane A-A, of a variant of the crystallizer inFig. 1 ; -
Fig. 3 is a cross section view taken along plane B-B of the crystallizer inFig. 1 ; -
Fig. 3a is a section view taken along plane B'-B', corresponding to plane B-B, of said variant of the crystallizer inFig. 1 ; -
Fig. 4 is a cross section view taken along plane C-C of the crystallizer inFig. 1 ; -
Fig. 4a is a section view taken along plane C'-C', corresponding to plane C-C, of said variant of the crystallizer inFig. 1 ; -
Fig. 5 is a cross section view taken along plane D-D of the crystallizer inFig. 1 ; -
Fig. 5a is a section view taken along plane D'-D', corresponding to plane D-D, of said variant of the crystallizer inFig. 1 . - The same reference numbers in the figures identify the same elements or components.
- Referring to the figures, preferred embodiments of a crystallizer for the continuous casting of substantially rectangular-shaped blooms or billets are shown.
- All the embodiments of the crystallizer, which is the object of the present invention, comprise:
a tubular body or castingtube 1, defining a longitudinal axis X, the cross section of which, along a plane orthogonal to the longitudinal axis X, defines the shape of said blooms or billets, the molten metal being cast exclusively through said tubular body (1); - a tubular body or
collar 2, coaxial and externally adjacent to thetubular body 1, having a predetermined thickness and arranged at a first zone of thetubular body 1, corresponding to the meniscus permanence zone during the continuous casting; - a third tubular body or
conveyor 3, coaxial and external to thetubular body 1, having a thickness smaller than the thickness of thetubular body 2 and arranged at a second zone of thetubular body 1, corresponding to a zone that is lower and adjacent to the meniscus permanence zone. - The meniscus permanence zone during the continuous casting is, for example, identified in
Figure 1 betweenlines - In the first embodiment in
Fig. 1 , thetubular body 3 is a body distinct from thetubular body 2 and is integrally fixed thereto by means of fixing means. - The
tubular body 2 consists of two pieces or semi-collars integrally joined to each other by fixing means, e.g. bolts. For example, as shown inFigures 3 and 3a , in the case of thetubular body 2 having a cross section, along a plane orthogonal to the vertical axis X, with circular outer perimeter and substantially rectangular inner perimeter, the two half-collars 2', 2",substantially U- or C-shaped, are joined by means ofbolts 31. For example, thesemi-collar 2" is provided withrecesses 32 on theouter surface 34 for fixing saidbolts 31. - The
tubular body 3 is arranged immediately underneath thetubular body 2 and is integrally fixed thereto. - Preferably, the upper end of the
tubular body 3 is provided with an annular outer protrusion 10 (Figures 1 ,4, 4a ) which acts as a connection with thetubular body 2. For example, a mechanical connection is obtained by means ofbolts 41 which crossrespective holes 42 provided on saidouter protrusion 10 along a circumference. - In a first variant, shown in
Fig. 1 , the thickness of thetubular body 3 is constant, preferably except from the upper end provided with the outerannular protrusion 10, and of about 15-40% of the thickness of thetubular body 2. - In a second variant (not shown), the thickness of the
tubular body 3 gradually decreases from its upper end, proximal to thetubular body 2, to its lower end, distal from thetubular body 2. - In a preferred variant, the
tubular body 3 consists of twoparts 33, 33' joined integrally to each other by means of fixing means, e.g. bolts, arranged along the longitudinal extension thereof. The twoparts 33, 33' have a U-shaped cross section, as shown for example inFigure 5 and 5a , or as shown inFigures 4 and 4a (see the part inside dashedlines 70 which indicate the outer surface of the tubular body 3). -
Part 33 has a protrudingedge 35 on its two ends (Figures 5, 5a ) so as to mate with a corresponding protrudingedge 35' provided at the two ends of part 33'.Bolts 71 are provided to tighten the protruding edges 35, 35' to each other and thus integrally fix the twoparts 33, 33' of thetubular body 3 to each other. Advantageously, in this first embodiment, thetubular body 2 is fitted on thetubular body 1 with a very low clearance, e.g. equal to or smaller than 0.1 mm, thus without providing any mechanical connection means, such as for example screws, betweentubular body 2 andtubular body 1. Thetubular body 2 can thus be removed from thetubular body 1 and used again. - In the second embodiment of
Fig. 1a ,tubular body 3 andtubular body 2 are obtained together in a singletubular body 20, thus with the same material externally provided with ashoulder 90 at the passage from the greater thickness of thebody 2 to the smaller thickness of thebody 3. - In a preferred variant, the single
tubular body 20 consists of two pieces, or semi-collars, integrally joined to each other by fixing means, e.g. bolts. A half-shoulder is provided in each half-collar at the passage from its upper portion, corresponding to half of thetubular body 2, to its lower portion, corresponding to half thetubular body 3. - The upper portions of the two half-collars, preferably C- or U-shaped, may be joined, for example, by means of bolts 31', being one of the two upper portions provided with recesses on its outer surface for fixing said bolts 31', in a manner similar to that shown in
Figures 3 and 3a . - The
lower portions 73 of the two half collars, preferably C- or U-shaped, may be for example joined integrally together by means of fixing means, such as bolts, arranged along their longitudinal extension. One of the two lower portions has a protrudingedge 75 on its two ends such to mate with a corresponding protruding edge provided at the two ends of the other lower portion. Bolts 71' are provided to fasten the protruding edges to each other, and thus integrally fix the twolower portions 73 of the two half-collars to each other in a manner similar to that shown inFigures 5 and 5a . - Advantageously, in this second embodiment, the single
tubular body 20 is fitted on thetubular body 1 with a very low clearance, e.g. either equal to or smaller than 0.1 mm, thus without providing any mechanical connection means, such as for example screws, betweentubular body 20 andtubular body 1. Thetubular body 20 can thus be removed from thetubular body 1 and used again. - The thickness of the
tubular body 1 is, instead, constant for its entire longitudinal extension. Advantageously, such a thickness is only 8-9 mm, in all cases no greater than 10 mm, if a smoothtubular body 1, i.e. one with the outer smooth walls, free from grooves, is used (Figure 2 ). If atubular body 1 with grooved outer walls is used instead, the thickness is greater, e.g. 12-15 mm (Figure 2a ). - In case of casting quadrangular section products, the
tubular body 1 and thetubular body 3 have a quadrangular-shaped cross section, along a plane perpendicular to axis X. Thetubular body 2 has, instead, a quadrangular plan inner surface and shape mating with the outer surface of the corresponding zone of thetubular body 1, while it has a circular or quadrangular outer surface. Also in the case oftubular body 2 having circular plan outer surface, the thickness of thetubular body 3 is smaller (Figures 4, 4a ) than the thickness of thetubular body 2, which is variable in cross section along a plane orthogonal to axis X, with the minimum value at the edges of the tubular body 1 (Figures 3, 3a ). At most, only the thickness of the upper end of thetubular body 3, provided withannular protrusion 10, may be equal to the thickness of the tubular body 2 (Figure 1 ). Advantageously, the outer and inner surfaces of the walls of thetubular body 1, seen along a plane orthogonal to longitudinal axis X, are concave surfaces with respect to the axis X itself. The slightly outward bulging shape of the inner and outer walls of thetubular body 1 promotes, during the casting, an outward widening of thetubular body 1, which is blocked by the presence of thetubular body 2 in particular at the meniscus permanence zone. Preferably, the sagitta of the arc of circumference which describes the surrounding of the concave inner surfaces of thetubular body 1 on a horizontal plane, i.e. the distance between the mid point of said arc of circumference and the mid point of the subtended chord, is of about 1-5 mm. - When casting round section products, instead, the
tubular body 1 and thetubular body 3 have a round-shaped cross section, along a plane perpendicular to axis X. Thetubular body 2 has a circular plan inner surface of shape mating the outer surface of the corresponding zone of thetubular body 1, preferably also it has a circular or quadrangular outer surface. - The
tubular body 1 is a monolithic body obtained by implosion on an appropriate die. It is preferably made of copper or alloys thereof, preferably Cu-Cr-Zr or Cu-Ag alloys. - Advantageously, the rigidity of the
tubular body 2 or of the aforesaid the singletubular body 20, preferably made of steel, is greater than that of thetubular body 1. - Importantly, to limit the formation of tensions, the
tubular body 1 is always made of a material which is less rigid than the material with which thetubular body 2 or the aforesaid singletubular body 20 are made. - A further advantage is that the
tubular body 2 is a substantially solid body, i.e. free from cavities inside its thickness.Introduction pipes 17, radial with respect to axis X, are provided to introduce a cooling liquid in thelongitudinal channels 4, only at the upper end of thetubular body 2. Other small cavities are provided, in the case oftubular body 2 in two parts, for fixing the two parts or semi-collars by means ofbolts 41. - The outer surface of the
tubular body 1 and the inner surface of thetubular body 2 define togetherlongitudinal channels 4, parallel to each other and parallel to the longitudinal axis X, for the passage of a cooling liquid from the top downwards. The cooling liquid, generally water, which flows in thelongitudinal channels 4 at the meniscus zone, continues to flow betweentubular body 1 andtubular body 3, in the zone under the meniscus zone, in respective extensions of saidlongitudinal channels 4. - Advantageously, the
tubular body 2 extends over a length from 15% to 50% of the total length of thetubular body 1 along the longitudinal axis X, preferably between 20% and 40%, and covers the upper part of thetubular body 1 near a first end thereof. - In a first embodiment of the invention, shown in
Figures 2 ,3 ,4 and5 , thelongitudinal channels 4 are defined at the meniscus zone by a plurality oflongitudinal grooves 6, made only on the inner walls of thetubular body 2 and along all its longitudinal extension, saidlongitudinal grooves 6 being closed by respective outer walls of thetubular body 1. - In a variant of said first embodiment, the
tubular body 3 is coaxial and externally adjacent to thetubular body 1 and there are provided furtherlongitudinal grooves 8, made on the inner walls of thetubular body 3 and along all its longitudinal extension. These furtherlongitudinal grooves 8, corresponding in number and position to thelongitudinal grooves 6, are closed by the outer walls of the tubular body 1 (Fig. 4 and5 ) and define an extension of saidlongitudinal grooves 6. - The
longitudinal grooves 8 have a cross section equal to that of the correspondinglongitudinal grooves 6. - The
grooves 6 have a substantially rectangular cross section, preferably (Fig. 2 and3 ) with a longer side of thechannels 4 in contact with the wall of thetubular body 1 and the two shorter sides substantially perpendicular to said wall. This solution indeed further improves heat exchange. The above applied togrooves 6 may also apply to thegrooves 8 underneath, as shown inFigure 4 and5 , for example. In particular, according to a preferred solution, as shown inFigures 2-5 , thechannels 4 are obtained with flat rectangular cross section, i.e. with one dimension much greater than the other, set apart bysmall spacers tubular body 1, belonging to thetubular body 2 and to thetubular body 3, preferably joined so as to have a resting surface tangent, in an infinitesimal manner, to the outer wall of thetubular body 1. - Preferably, the number of
grooves 6 is odd, e.g. five as in the Figures, so that, in the case oftubular body 2 made of two parts joined together, the central groove at the two opposite sides of thetubular body 1 is obtained half on the first half-collar 2' and half on the second half-collar 2". Similarly, the number of thecorresponding grooves 8 is odd, so that in case oftubular body 3 made of two parts joined to each other, the central groove at the two opposite sides of thetubular body 1 is obtained half on thefirst part 33 and half on the second part 33'. - Another alternative solution (not shown) is that wherein the shorter side of the
channels 4 is in contact with the wall of thetubular body 1 and the longer two sides are substantially perpendicular to said wall. Optionally, longitudinal grooves (not shown) may be provided at the inner edges of thetubular body 2, and also at the inner edges of thetubular body 3 underneath. - In a second embodiment of the invention, shown in
Figures 2a ,3a ,4a and5a , thelongitudinal channels 4 are defined by a plurality of longitudinal grooves 6', made only on the outer walls of thetubular body 1 both attubular body 2 and attubular body 3, said longitudinal grooves 6' being closed at the top by the inner walls of thetubular body 2 and at the bottom by the inner walls of thetubular body 3. The longitudinal grooves 6' have a substantially square-shaped cross section. Preferably, they are odd in number. - In a third embodiment of the invention (not shown) there are:
- first longitudinal grooves made on the inner walls of the
tubular body 2 along its entire longitudinal extension; - second longitudinal grooves made on the inner walls of the
tubular body 3 along its entire longitudinal extension; - and third longitudinal grooves made on the outer walls of the
tubular body 1. Said second longitudinal grooves define an extension of corresponding first longitudinal grooves, and each third longitudinal groove defines a respective longitudinal cooling channel together with a respective first and second longitudinal groove. - All
longitudinal grooves - All longitudinal grooves of the various embodiments of the invention have a longitudinal axis parallel to the longitudinal axis X of the
tubular body 1. - With reference to
Fig. 1 , and for alternative embodiments, supportingflanges tube 1 and a supportingflange 13 of the upper end of the tubular body orcollar 2 are provided. The supportingflanges ring Introduction pipes 17 for introducing the cooling liquid in thelongitudinal channels 4 are provided in the supportingflange 13 and in the upper end of thetubular body 2. - Similarly, at the lower end of the
tubular body 1, the supportingflanges ring 14. Anoutlet pipe 21 of the cooling liquid coming from the space between thetubular body 1 and the tubular body orconveyor 3, is provided in the upper supportingflange 18.
Claims (16)
- A crystallizer for a continuous casting of blooms or billets comprising
a first monolithic tubular body (1) for casting molten metal, defining a longitudinal axis X and the cross section of which, along a plane orthogonal to the longitudinal axis X, is adapted to define the shape of said blooms or billets, said first tubular body (1) being the only tubular body of the crystallizer coming into contact with the molten metal;
a second tubular body (2), coaxial and externally adjacent to said first tubular body (1), having a first thickness and arranged at a first zone of the first tubular body (1), corresponding to the zone where the meniscus is permanently maintained during the continuous casting;
a third tubular body (3), coaxial and external to said first said tubular body (1), having a second thickness smaller than said first thickness and arranged at a second zone of the first tubular body (1), corresponding to a zone that is lower and adjacent to said first zone;
wherein an outer surface of the first tubular body (1), together with both an inner surface of the second tubular body (2) and an inner surface of the third tubular body (3), define longitudinal channels (4), parallel to each other and parallel to the longitudinal axis X, for the passage of a cooling liquid,
wherein the second tubular body (2) is more rigid than the first monolithic tubular body (1). - A crystallizer according to claim 1, wherein the outer and inner surfaces of the walls of said first tubular body (1) are concave surfaces with respect to the longitudinal axis X.
- A crystallizer according to claim 1 or 2, wherein the third tubular body (3) is a body distinct from the second tubular body (2) and is integrally fixed to said second tubular body.
- A crystallizer according to claim 3, wherein the second tubular body (2) is fitted on the first tubular body (1), preferably with a clearance either equal to or smaller than 0.1 mm.
- A crystallizer according to claim 3 or 4, wherein said second tubular body (2) is formed by two parts (2', 2") which are integrally fixed to each other.
- A crystallizer according to claim 5, wherein said third tubular body (3) is formed by two parts (33', 33") which are integrally fixed to each other.
- A crystallizer according to claim 1 or 2, wherein the third tubular body (3) and the second tubular body (2) are made together in a single tubular body (20), being more rigid than the first monolithic tubular body (1), externally provided with a shoulder (90) at the passage from said first thickness to said second thickness.
- A crystallizer according to claim 7, wherein said single tubular body (20) is fitted on the first tubular body (1), preferably with a clearance either equal to or smaller than 0.1 mm.
- A crystallizer according to claim 7 or 8, wherein said single tubular body (20) is formed by two parts which are integrally fixed to each other.
- A crystallizer according to any one of the preceding claims, wherein the second tubular body (2) extends over a length from 15% to 50% of the total length of the first tubular body (1) along the longitudinal axis X, preferably from 20% to 40%.
- A crystallizer according to any one of the preceding claims, wherein there are provided longitudinal grooves (6) made on inner walls of the second tubular body (2) and along the entire longitudinal extension thereof, said longitudinal grooves (6) being closed by outer walls of the first tubular body (1) so as to define the longitudinal channels (4).
- A crystallizer according to claim 11, wherein the third tubular body (3) is externally adjacent to the first tubular body (1), and there are provided further longitudinal grooves (8) made on inner walls of the third tubular body (3) and along the entire longitudinal extension thereof, said further longitudinal grooves (8) being closed by the outer walls of the first tubular body (1) and defining an extension of corresponding longitudinal grooves (6).
- A crystallizer according to any one of the claims from 1 to 10, wherein there are provided longitudinal grooves (6') made on outer walls of the first tubular body (1), said longitudinal grooves (6') being closed in an upper stretch thereof by inner walls of the second tubular body (2) and being closed in a lower stretch thereof by inner walls of the third tubular body (3) so as to define the longitudinal channels (4).
- A crystallizer according to any one of the claims from 1 to 10, wherein there are provided first longitudinal grooves made on inner walls of the second tubular body (2) along the entire extension thereof, second longitudinal grooves made on inner walls of the third tubular body (3) along the entire longitudinal extension thereof, and third longitudinal grooves made on outer walls of the first tubular body (1), wherein the second longitudinal grooves define an extension of corresponding first longitudinal grooves, and wherein each third longitudinal groove defines a respective longitudinal channel together with a respective first longitudinal groove and a respective second longitudinal groove.
- A crystallizer according to any one of the preceding claims, wherein the second thickness is 15-40% of the first thickness.
- A crystallizer according to any one of the claims from 1 to 14, wherein the second thickness gradually decreases from a first end of the third tubular body (3), proximal to the second tubular body (2), to a second end thereof, which is distal from the second tubular body (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUB2015A000498A ITUB20150498A1 (en) | 2015-05-05 | 2015-05-05 | CRYSTALLIZER FOR CONTINUOUS CASTING |
PCT/IB2016/052536 WO2016178153A1 (en) | 2015-05-05 | 2016-05-04 | Crystallizer for continuous casting |
Publications (2)
Publication Number | Publication Date |
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EP3291931A1 EP3291931A1 (en) | 2018-03-14 |
EP3291931B1 true EP3291931B1 (en) | 2019-10-30 |
Family
ID=53765421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16730484.9A Active EP3291931B1 (en) | 2015-05-05 | 2016-05-04 | Crystallizer for continuous casting |
Country Status (4)
Country | Link |
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EP (1) | EP3291931B1 (en) |
CN (1) | CN209005217U (en) |
IT (1) | ITUB20150498A1 (en) |
WO (1) | WO2016178153A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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IT201700027045A1 (en) * | 2017-03-10 | 2018-09-10 | Em Moulds S P A A Socio Unico | CRYSTALLIZER FOR CONTINUOUS CASTING AND METHOD TO OBTAIN THE SAME |
IT201900010347A1 (en) | 2019-06-28 | 2020-12-28 | Danieli Off Mecc | CRYSTALLIZER FOR CONTINUOUS CASTING OF A METALLIC PRODUCT AND RELATIVE CASTING PROCEDURE |
CN112091188B (en) * | 2020-10-13 | 2024-07-09 | 中冶赛迪工程技术股份有限公司 | Multistage continuous casting crystallizer |
CN113426968B (en) * | 2021-05-20 | 2022-12-13 | 山东创新金属科技有限公司 | Aluminum alloy round cast ingot oil-gas lubricating film casting device and method |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2423285A1 (en) * | 1978-04-17 | 1979-11-16 | Siderurgie Fse Inst Rech | COOLING SHIRT FOR CONTINUOUS METAL CASTING LINGOTIER |
EP0686445B1 (en) * | 1994-06-06 | 2000-08-16 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Method to control the deformations of the sidewalls of a crystalliser, and continuous-casting crystalliser |
JP2000061586A (en) * | 1998-08-17 | 2000-02-29 | Mitsubishi Heavy Ind Ltd | Continuous casting apparatus |
US6338380B1 (en) * | 2001-04-27 | 2002-01-15 | O'dwyer James P. | Multiport mold cooling apparatus for continuous casting |
JP3930761B2 (en) * | 2002-04-17 | 2007-06-13 | 株式会社神戸製鋼所 | Tube type continuous casting mold |
ITMI20061622A1 (en) * | 2006-08-11 | 2008-02-12 | Danieli & C Officine Meccaniche Spa | CTRISTALLIZZATORE |
EP2014393B1 (en) * | 2007-06-04 | 2012-04-11 | Concast Ag | Mould for strand casting of blooms, cogged blooms or billets |
AT512433B1 (en) * | 2012-01-30 | 2017-08-15 | Primetals Technologies Austria GmbH | CONTINUOUS COIL FOR THE CONTINUOUS CASTING OF A STRING WITH A BILL OR PRE-BLOCK PROFILE |
CN102527960A (en) * | 2012-02-15 | 2012-07-04 | 曲沃县民政福利企业有限公司 | Novel crystallizer for horizontal continuous casting |
ITUD20130090A1 (en) * | 2013-06-28 | 2014-12-29 | Danieli Off Mecc | CRYSTALLIZER FOR CONTINUOUS CASTING AND PROCEDURE FOR ITS REALIZATION |
ITUD20130137A1 (en) * | 2013-10-23 | 2015-04-24 | Danieli Off Mecc | CRYSTALLIZER FOR CONTINUOUS CASTING AND METHOD FOR ITS REALIZATION |
-
2015
- 2015-05-05 IT ITUB2015A000498A patent/ITUB20150498A1/en unknown
-
2016
- 2016-05-04 EP EP16730484.9A patent/EP3291931B1/en active Active
- 2016-05-04 CN CN201690000761.XU patent/CN209005217U/en active Active
- 2016-05-04 WO PCT/IB2016/052536 patent/WO2016178153A1/en active Application Filing
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ITUB20150498A1 (en) | 2016-11-05 |
CN209005217U (en) | 2019-06-21 |
EP3291931A1 (en) | 2018-03-14 |
WO2016178153A1 (en) | 2016-11-10 |
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