CA2296619A1 - Plate having a funnel-shaped pouring region for a metal mold for continuous casting of metal - Google Patents
Plate having a funnel-shaped pouring region for a metal mold for continuous casting of metal Download PDFInfo
- Publication number
- CA2296619A1 CA2296619A1 CA 2296619 CA2296619A CA2296619A1 CA 2296619 A1 CA2296619 A1 CA 2296619A1 CA 2296619 CA2296619 CA 2296619 CA 2296619 A CA2296619 A CA 2296619A CA 2296619 A1 CA2296619 A1 CA 2296619A1
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- Prior art keywords
- plate
- metal mold
- slots
- cooling medium
- set forth
- Prior art date
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- 239000002184 metal Substances 0.000 title claims abstract description 55
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 55
- 238000009749 continuous casting Methods 0.000 title claims abstract description 8
- 239000002826 coolant Substances 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000005266 casting Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000000155 melt Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000009827 uniform distribution Methods 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 101150115956 slc25a26 gene Proteins 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000161 steel melt Substances 0.000 description 1
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
- B22D11/059—Mould materials or platings
-
- 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
- B22D11/0408—Moulds for casting thin slabs
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
A plate for a metal mold for continuous casting of metal and a funnel-shaped pouring region narrowing in casting direction to a size of a cast billet, and a rear wall provided with slots in which a cooling medium flows, with the course of the slots deviating from a horizontal at least in one height section of the plate by no more than 30°; and method of cooling the metal mold plate.
Description
01/28/00 15:54 FAX 615 230 8821 MARRS & CLERK 1002 BACKGROUND OF THE INVENTION
1. Field of the Invention. ' The present invention relates to plate for a metal mold for continuous casting of metal and having a funnel--shaped pouring region narrowing in casting direction to a size of a cast billet, and a rear wall provided with slots in which a cooling medium flows.
The present invention also relates to a method of cooling of a metal mold plate.
1. Field of the Invention. ' The present invention relates to plate for a metal mold for continuous casting of metal and having a funnel--shaped pouring region narrowing in casting direction to a size of a cast billet, and a rear wall provided with slots in which a cooling medium flows.
The present invention also relates to a method of cooling of a metal mold plate.
2. Description of tb~e Pxxor Art The object of a metal mold is to form a billet and to absorb the heat released by the melt upon shell growth. At the metal mold outlet, the shell must be so thick that it can withstand thermal and mechanical loads and, at the same tizxxe, there would not be teared up of the billet.
In a steel mold, the heat is absorbed by the cooling water which flows in drilled channels or slots which are milled in the rear wall of the plate and which form, together with an outer surface of a water box, rectangular channels.
NY Llg i /b52440/ I
01/28/00 15:35 FAX 613 230 8821 MARES & CLERK . 1003 Conventionally, ire accordance with the existent technology, the cooling channels or slots extend vertically, i.e., in the casting direction to achieve as uniform as possible heat removal over the plate width. The arrangement of the bores and slots and the selection of their dimensions are effected in such a way that as uniform as possible removal of heat over the entire surface of the plate is insured.
In addition, upon designnz~g of a mold plate, the art'an,gement of the tbxeads or of the thread inserts for receiving the screws, with which the plate is attached to the water box, should be taken into consideration. The number of the attachment poixtts should be sufficiently large to prevent the deformation of the plate above a tolerable amount as result of an application of a thermal load during a casting process.
For casting slabs, the vertically extending slots extend over the entire plate.
The drilled plate are relatively expensive in manufacture and, therefore, are preferably used where only a small deformation of the metal mold cavity is acceptable as, e.g., during a continuous casting of blooms.
NYLIB i /652440 t 01/28/00 15:35 FAX 813 230 8821 MARKS & CLERK ~ 004 Further, despite large thermal loads during contact with a steel melt, a correct design of and a selection of a material for a mold plate exclude formation of cracks in the working surface of the metal mold plate.
Nontheless, the use of the plate Leads, with time, to the damage of the working surface such as mechanical wear during the casting process, the appearance of scratches as a result of lead-in and draw-out of the dummy bar and of the adjustment of the narrow sides during the casting process, and to local deformations which result in the formation of a clearance with the narrow sides.
The service life of a metal mold plate depends substantially on the frequency, position, and depth of such damages and the number of possible millings of the working surface at which respective layers of the surface are mechanically removed.
The idea to provide a funnel-shaped pouring region can be traced back.to the tendency to cast as thin a billet as possible which billet, after exiting the casting machine, is separated into slabs and is fed, through a furnace, directly to a rolling train.
I~f YLID l /652440/ l 01/28/00 15:x5 FAX 615 2a0 8821 MARKS & CL.ERR _ f~005 The dimensions of the pouring region are essentially determined by the cross-section of a cast billet, the dimensions of the submerged entry nozzle and its submergence into the melt.
During operation of several continuous casting plants with drilled and slotted metal mold plates formed of different copper alloys and having funnel-shaped pouring regions having different dimensions, it was found out that after a comparatively small number of several hundred castings, cracks were formed in the copper mold plate at the height of the bath level. After, in average, three-four millings, therefore, in comparison with a metal mold plate having an even working surface, the treated plate had a service life of about 1000 melts which nurx~ber is in several times smaller that the usual number of melts for the plate with the even working surface.
The fissures are the result of the fatigue of the mold material resulting from alternating plastic strains. The measurement with thermo elements provided on the metal mold plate and a static evaluation of the occurrence of the scratches have shown that the scratches are always located in the IVYL.1B t/65Z44(l/ 1 S
01/28/00 15:35 FAX 813 230 8821 . MARRS & CLERK ~ 008 transitional region of the funnel-shaped part and the plain lateral parts of the mold and~are not caused by an excessive local thermal load.
The distribution of the stresses arid strains over the width of a metal mold plate having a flat or arched working surface is determined, by, in addition to the cross-section, the number of attachment points, their positions, and spring constant of the attachment screws. The smaller is the number of the attachment points, the more uneven is the distribution of stresses and strains over the metal mold plate. They concentx-ate, dependent on the ax~r~gement of the attachment points, increasingly in the region of one of the outer Vertical roves of the attachment points on each side. 'therefore, a prerequisite for a uniform distribution of stresses and elongations over the width of a metal mold plate, with regard to the prevention of cracks, is provision of a sufficicntly large amount of the attachment points.
Further investigations and calculation of the stresses and strains have shown that additional strains in the transitional region between funnel and lateral parallel portions favorably influences the formation of the cracks in the NY l.I R 1 /~$ 2440/1 ~7 01/28/00 15:35 FAX 813 230, 8821 _ MARKS & CLERK f~007 metal mold plate which are traced back to the existence of a camber that serves for formation of the funnel-shaped pouring region.
'1 he mechanism of the appearance of the additional strains can be explained with reference to Fig. 1 which shows a portion of a cross-sectional view of an upper region of a drihed metal mold platel. The plate is secured to the water box 2 with screws S 1, S2, S3, S4, S5, S6. The billet width is determined by the position of the narrow side plate 3. The location of the cooling bores is determined by working thickness d~, i.e., by the distaxxce of the bores :Crorn. the working surface, and by a distance d2 from the rear wall.
The heating of the metal mold plate I by a heat flow q, e.g., during a casting phase or as result of the displacement of the bath level, leads, as a result o~ the expansion of the plate material, to a length change in the direction toward the narrow side which, in case of an even working surface, is not prevented or obstructed. Therefore, no additional stresses or strains occur in the plate.
In a metal mold with a funnel-shaped pouring region having a width B, the working surface of the plate additionally buckles because this region cannot freely expand with screw S 1, S2, S3, S4, SS, S6 at points defined by positions X1, X2, NY[.f B I /G52440/I
01/28/00 15:35 FAX 813 230 8821 MARKS & CLERK f~008 X3, 7C4, X5, X6. Upon cooling of the plate, e.g., after the end of the casting process, because of tlae contraction, a length change in the opposite direction takes place, and the previously buckled region of the working surface will addition~,ally be stretched.
The distribution of this additional alternating strains over the plate width is predetermined by the profile of the arched or bulged region which, in this case, is determined by radii R1 and R2 and by the funnel opening T, by the positions X1, X2, X3, X4, X5, X6 of the attachment screws S1, S2, S3, S4, S5, S6 with xespect to the cowrse of this pxo'hle and by the elasticity of the attachment screws S 1, S2, S3, S4, S 5, Sf .
'The intensity of this additional alternating strains are determined, together with the thermal load applied to the metal mold plate by the heat flow q and by the characteristics of the material of the plate, the following parameter:
the working thickness d~, between the working surface and the cooling bores, the plate thickness d2 between the cooling bores and the rear wall, and the width B/2 of the arched or buckled regzon.
NY LIB I ~652d40~ I
01/28/00 15:x5 FAX 615 290. 8821 _ MARKS & CLERK f~009 The calculations conducted for a drilled and slotted metal mold plate with a funnel-shaped pouring region, which is used in casting, have shown that the additional aItexnanz~g strains, together with strains caused by the general thermal Load, reach a value that results in a very rapid fatigue of the plate material due to the plastic variable deformation.
if the load acting on the arched metal mold plate is to be reduced by constructive measures to an uncritical amount with regard to susceptibility to formation of cxaclcs, it is necessary to incxease the sriffness of the plate cross-section which, nn the simplest case, is achieved by increasing the thickness between the cooling bores or slots and the rear wall of the plate from dZ to a necessary value.
Because no temperature gradient exists behind the cooling channels, the increase of the plate thickness by increasing the thickness of the plate between the rear wall and the cooling channel leads, at the one and sarne thermal load, to a more uniform distribution of stresses and elongations over the plate width.
The expansion of the metal mold plate in a horizontal directions which favors the formation of the cracks in the working surface decreases because the NYL_IB I /G52440/1 01/28/00 15:35. FAX 613 .230 8821 MARKS & CLERK I~JO10 plate behind the bores is not heated strong enough in comparison with the region between the working surface and the cooling bores, and the average temperature over the mold cross-section becomes generally smaller_ Therefore, drilled plate with an adequately large thickness d2 between the cooling bores and the rear wall and which is attached to the water box with a suffciently large number of screws S 1, S2, S3, S4, S5, S6, insures that the working surface, up to a predetermined thermal load q max rcrnains free of fissures, and that, upon exceeding this thermal load, the cracks axe uniformly distributed over the width of the plate.
The drawback of such a drilled plate consists inn that the manufacture of such drilled plate is very expensive in comparison with a slotted plate.
Accordingly, an object of the present invention is to provide a metal mold plate with a funnel-shaped pouring region and with water-cooled slots on the rear wall and the working surface of which remains crack-free up to a predetermined thermal load q max and which, upon the thermal load exceeding the predetermined thermal load, has the cracks uniformly distributed over the to 01/28/00 15:35 FAg 613 230 8821 _ MARRS & CLERK I~O11 plate width, so that the plate has the samc service life as the plate with llat~
walls.
SUMMARY OF THE INVEhT'I'rUN
This and other objects of the present invention,~which will become apparent hereinafter, are achieved by forming the slots in the rear wall of the plate in such a manner that at least in one height section o~ the arched region of the plate, the course of the slots deviates from a horizontal by no more then 30°.
The present invention is based on a premise that in order to prevent the formation of cracks on the working surface at a predetermined working thickness, the plate cross-section should be as large as possible because the increased stiffriess and a smaller horizontal thermal expansion, which are associated with an increased cross-section, lead to a uniform distribution of the stz-esses and strains over the width of the plate.
The novel features of the present invention, which are considercd as characteristic for the invention, are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its mode NYLID1~65244p/~
01/28/00 15:38 FAg 813 230 8821. MARKS & CLERK 1012 of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments, when read with reference to the accompanying drawings.
BRIEF D)CSCRIPTION OF THE DRAWINGS:
The drawings show:
Pig. 1. a portion of a cross-section view of an upper region of a conventional funnel-shaped metal mold plate with a plurality of cooling bores;
Fig_ 2a_ a rear view o~ a metal mold plate with a plurality of slots and with a funnel-shaped pouring region according to the prevent invention;
Fig. 2b. a rear view of the metal mold plate shown in Fig.2a.; and Fig. 3. a cross-sectional view along line C-C of the metal mold plate shown in Fig. 2b and provided with inserts and bores for locking screws.
NY LIH 1 ~65Za4U~1 01/28/00 15:38 FAg. 613 230. 8821 MARKS & CLERK f~013 DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
Fig. 2 shows a metal mold plate 4 of a continuous casting metal mold according to the present invention. The metal mold plate 4 has, as shown in Fig. 2, a funnel--shaped arcuate pouring region 5 which begins at a mold upper edge 6 and diminishes toward the narrow sides 3 and in the pouring direction to the size of a cast billet.
The rear side of the metal mold plate 4, at least in its upper region, has a plurality of slots 7 in which a cooling water flows. The course of the slots 7 deviates from a horizontal plane by no more than 30°. However, in a preferred embodiment of the present invention, the slots extend over the width of the plate 4 substantially horizontally, as shown in Fig. 2.
The depth and/or the width of the slots 7 and the distance between them can remain constant or vary over the height and/or width o~ the mold plate 4.
According to a further preferred embodiment of the present invention, it is contemplated to insert inserts 9 into the slots 7 in order to increase the flow fY Y LI B 1 /65244U/ t 01/28/00 15.:x6 FAX 81a 2~0 8821 MARKS & CLERK f~J014 velocity and to reduce the consumption of the cooling water. The inserts 9 can be made of any suitable material.
Along the slots 7, the inserts 9 are connected, in any suitable manner with webs limiting the slots 7. In this way, the inserts 9 additionally increase the stiffizess ox rigidity of the plate cross-section. The inserts 9 permit to reduce the thiclrness of the plate 4 necessary for the required stiffness of the metal mold cross-section. The reduction of the thickness of the plate 4 permits, in turn, to reduce the dimension of the metal mold. ,A, further advantage of using the inserts 9 consists in the reduction of costs of the materials. The reduction of the dimensions of the metal mold perzxoits to reduce the amount of the material of which the metal mold is made, usually a copper alloy which is comparatively more expensive than steel of which the inserts 9 are made.
,A.nd important advantage of the present invention consists in the possibility of separate delivery of cooling medium for different height regions.
By a controlled influence of the heat transfer in the metal mold at different height sections, the quality of the cast billet can be improved.
01/28/00 15:36. FAX 613 230 8821 MARKS & CLERK 1~J015 Accordingly to the invention, the cooling medium can be delivered at one side of the mold plate 4 and removal at the other side. Advantageously, however, the fluid medium is delivered ai both sides and is removed at the middle or is delivered at the middle and is removed at both sides. Because in both cases, the increase of the temperature of the cooling medium dozing its flow through the cooling slots is reduced in half, the unevenness of the heat transfer over the width of the metal mold plate 4 is also reduced.
The cooling medium can flow in different slots 7 in opposite directions.
This additionally reduces the uxzevenness of the heat transfer over the width of the metal mold plate 4. This is because upon flo~uv of the cooling nZedaum in opposite directions, the increase of the temperature of the cooling medium is transmitted back to the stream of the cooling medium with a smaller .
temperature_ Though the present invention was shown and described with references to the preferred embodiments, such are merely illustrative of the present invention and axe not to be constzucted as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the NYLfH I /652a.~10I1 is 01/28/00 15:38 FAX 613 230 8821 MARKS & CLERK l~ 018 art. It is therefore not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.
N Y Ll B I /652440/ 1
In a steel mold, the heat is absorbed by the cooling water which flows in drilled channels or slots which are milled in the rear wall of the plate and which form, together with an outer surface of a water box, rectangular channels.
NY Llg i /b52440/ I
01/28/00 15:35 FAX 613 230 8821 MARES & CLERK . 1003 Conventionally, ire accordance with the existent technology, the cooling channels or slots extend vertically, i.e., in the casting direction to achieve as uniform as possible heat removal over the plate width. The arrangement of the bores and slots and the selection of their dimensions are effected in such a way that as uniform as possible removal of heat over the entire surface of the plate is insured.
In addition, upon designnz~g of a mold plate, the art'an,gement of the tbxeads or of the thread inserts for receiving the screws, with which the plate is attached to the water box, should be taken into consideration. The number of the attachment poixtts should be sufficiently large to prevent the deformation of the plate above a tolerable amount as result of an application of a thermal load during a casting process.
For casting slabs, the vertically extending slots extend over the entire plate.
The drilled plate are relatively expensive in manufacture and, therefore, are preferably used where only a small deformation of the metal mold cavity is acceptable as, e.g., during a continuous casting of blooms.
NYLIB i /652440 t 01/28/00 15:35 FAX 813 230 8821 MARKS & CLERK ~ 004 Further, despite large thermal loads during contact with a steel melt, a correct design of and a selection of a material for a mold plate exclude formation of cracks in the working surface of the metal mold plate.
Nontheless, the use of the plate Leads, with time, to the damage of the working surface such as mechanical wear during the casting process, the appearance of scratches as a result of lead-in and draw-out of the dummy bar and of the adjustment of the narrow sides during the casting process, and to local deformations which result in the formation of a clearance with the narrow sides.
The service life of a metal mold plate depends substantially on the frequency, position, and depth of such damages and the number of possible millings of the working surface at which respective layers of the surface are mechanically removed.
The idea to provide a funnel-shaped pouring region can be traced back.to the tendency to cast as thin a billet as possible which billet, after exiting the casting machine, is separated into slabs and is fed, through a furnace, directly to a rolling train.
I~f YLID l /652440/ l 01/28/00 15:x5 FAX 615 2a0 8821 MARKS & CL.ERR _ f~005 The dimensions of the pouring region are essentially determined by the cross-section of a cast billet, the dimensions of the submerged entry nozzle and its submergence into the melt.
During operation of several continuous casting plants with drilled and slotted metal mold plates formed of different copper alloys and having funnel-shaped pouring regions having different dimensions, it was found out that after a comparatively small number of several hundred castings, cracks were formed in the copper mold plate at the height of the bath level. After, in average, three-four millings, therefore, in comparison with a metal mold plate having an even working surface, the treated plate had a service life of about 1000 melts which nurx~ber is in several times smaller that the usual number of melts for the plate with the even working surface.
The fissures are the result of the fatigue of the mold material resulting from alternating plastic strains. The measurement with thermo elements provided on the metal mold plate and a static evaluation of the occurrence of the scratches have shown that the scratches are always located in the IVYL.1B t/65Z44(l/ 1 S
01/28/00 15:35 FAX 813 230 8821 . MARRS & CLERK ~ 008 transitional region of the funnel-shaped part and the plain lateral parts of the mold and~are not caused by an excessive local thermal load.
The distribution of the stresses arid strains over the width of a metal mold plate having a flat or arched working surface is determined, by, in addition to the cross-section, the number of attachment points, their positions, and spring constant of the attachment screws. The smaller is the number of the attachment points, the more uneven is the distribution of stresses and strains over the metal mold plate. They concentx-ate, dependent on the ax~r~gement of the attachment points, increasingly in the region of one of the outer Vertical roves of the attachment points on each side. 'therefore, a prerequisite for a uniform distribution of stresses and elongations over the width of a metal mold plate, with regard to the prevention of cracks, is provision of a sufficicntly large amount of the attachment points.
Further investigations and calculation of the stresses and strains have shown that additional strains in the transitional region between funnel and lateral parallel portions favorably influences the formation of the cracks in the NY l.I R 1 /~$ 2440/1 ~7 01/28/00 15:35 FAX 813 230, 8821 _ MARKS & CLERK f~007 metal mold plate which are traced back to the existence of a camber that serves for formation of the funnel-shaped pouring region.
'1 he mechanism of the appearance of the additional strains can be explained with reference to Fig. 1 which shows a portion of a cross-sectional view of an upper region of a drihed metal mold platel. The plate is secured to the water box 2 with screws S 1, S2, S3, S4, S5, S6. The billet width is determined by the position of the narrow side plate 3. The location of the cooling bores is determined by working thickness d~, i.e., by the distaxxce of the bores :Crorn. the working surface, and by a distance d2 from the rear wall.
The heating of the metal mold plate I by a heat flow q, e.g., during a casting phase or as result of the displacement of the bath level, leads, as a result o~ the expansion of the plate material, to a length change in the direction toward the narrow side which, in case of an even working surface, is not prevented or obstructed. Therefore, no additional stresses or strains occur in the plate.
In a metal mold with a funnel-shaped pouring region having a width B, the working surface of the plate additionally buckles because this region cannot freely expand with screw S 1, S2, S3, S4, SS, S6 at points defined by positions X1, X2, NY[.f B I /G52440/I
01/28/00 15:35 FAX 813 230 8821 MARKS & CLERK f~008 X3, 7C4, X5, X6. Upon cooling of the plate, e.g., after the end of the casting process, because of tlae contraction, a length change in the opposite direction takes place, and the previously buckled region of the working surface will addition~,ally be stretched.
The distribution of this additional alternating strains over the plate width is predetermined by the profile of the arched or bulged region which, in this case, is determined by radii R1 and R2 and by the funnel opening T, by the positions X1, X2, X3, X4, X5, X6 of the attachment screws S1, S2, S3, S4, S5, S6 with xespect to the cowrse of this pxo'hle and by the elasticity of the attachment screws S 1, S2, S3, S4, S 5, Sf .
'The intensity of this additional alternating strains are determined, together with the thermal load applied to the metal mold plate by the heat flow q and by the characteristics of the material of the plate, the following parameter:
the working thickness d~, between the working surface and the cooling bores, the plate thickness d2 between the cooling bores and the rear wall, and the width B/2 of the arched or buckled regzon.
NY LIB I ~652d40~ I
01/28/00 15:x5 FAX 615 290. 8821 _ MARKS & CLERK f~009 The calculations conducted for a drilled and slotted metal mold plate with a funnel-shaped pouring region, which is used in casting, have shown that the additional aItexnanz~g strains, together with strains caused by the general thermal Load, reach a value that results in a very rapid fatigue of the plate material due to the plastic variable deformation.
if the load acting on the arched metal mold plate is to be reduced by constructive measures to an uncritical amount with regard to susceptibility to formation of cxaclcs, it is necessary to incxease the sriffness of the plate cross-section which, nn the simplest case, is achieved by increasing the thickness between the cooling bores or slots and the rear wall of the plate from dZ to a necessary value.
Because no temperature gradient exists behind the cooling channels, the increase of the plate thickness by increasing the thickness of the plate between the rear wall and the cooling channel leads, at the one and sarne thermal load, to a more uniform distribution of stresses and elongations over the plate width.
The expansion of the metal mold plate in a horizontal directions which favors the formation of the cracks in the working surface decreases because the NYL_IB I /G52440/1 01/28/00 15:35. FAX 613 .230 8821 MARKS & CLERK I~JO10 plate behind the bores is not heated strong enough in comparison with the region between the working surface and the cooling bores, and the average temperature over the mold cross-section becomes generally smaller_ Therefore, drilled plate with an adequately large thickness d2 between the cooling bores and the rear wall and which is attached to the water box with a suffciently large number of screws S 1, S2, S3, S4, S5, S6, insures that the working surface, up to a predetermined thermal load q max rcrnains free of fissures, and that, upon exceeding this thermal load, the cracks axe uniformly distributed over the width of the plate.
The drawback of such a drilled plate consists inn that the manufacture of such drilled plate is very expensive in comparison with a slotted plate.
Accordingly, an object of the present invention is to provide a metal mold plate with a funnel-shaped pouring region and with water-cooled slots on the rear wall and the working surface of which remains crack-free up to a predetermined thermal load q max and which, upon the thermal load exceeding the predetermined thermal load, has the cracks uniformly distributed over the to 01/28/00 15:35 FAg 613 230 8821 _ MARRS & CLERK I~O11 plate width, so that the plate has the samc service life as the plate with llat~
walls.
SUMMARY OF THE INVEhT'I'rUN
This and other objects of the present invention,~which will become apparent hereinafter, are achieved by forming the slots in the rear wall of the plate in such a manner that at least in one height section o~ the arched region of the plate, the course of the slots deviates from a horizontal by no more then 30°.
The present invention is based on a premise that in order to prevent the formation of cracks on the working surface at a predetermined working thickness, the plate cross-section should be as large as possible because the increased stiffriess and a smaller horizontal thermal expansion, which are associated with an increased cross-section, lead to a uniform distribution of the stz-esses and strains over the width of the plate.
The novel features of the present invention, which are considercd as characteristic for the invention, are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its mode NYLID1~65244p/~
01/28/00 15:38 FAg 813 230 8821. MARKS & CLERK 1012 of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments, when read with reference to the accompanying drawings.
BRIEF D)CSCRIPTION OF THE DRAWINGS:
The drawings show:
Pig. 1. a portion of a cross-section view of an upper region of a conventional funnel-shaped metal mold plate with a plurality of cooling bores;
Fig_ 2a_ a rear view o~ a metal mold plate with a plurality of slots and with a funnel-shaped pouring region according to the prevent invention;
Fig. 2b. a rear view of the metal mold plate shown in Fig.2a.; and Fig. 3. a cross-sectional view along line C-C of the metal mold plate shown in Fig. 2b and provided with inserts and bores for locking screws.
NY LIH 1 ~65Za4U~1 01/28/00 15:38 FAg. 613 230. 8821 MARKS & CLERK f~013 DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
Fig. 2 shows a metal mold plate 4 of a continuous casting metal mold according to the present invention. The metal mold plate 4 has, as shown in Fig. 2, a funnel--shaped arcuate pouring region 5 which begins at a mold upper edge 6 and diminishes toward the narrow sides 3 and in the pouring direction to the size of a cast billet.
The rear side of the metal mold plate 4, at least in its upper region, has a plurality of slots 7 in which a cooling water flows. The course of the slots 7 deviates from a horizontal plane by no more than 30°. However, in a preferred embodiment of the present invention, the slots extend over the width of the plate 4 substantially horizontally, as shown in Fig. 2.
The depth and/or the width of the slots 7 and the distance between them can remain constant or vary over the height and/or width o~ the mold plate 4.
According to a further preferred embodiment of the present invention, it is contemplated to insert inserts 9 into the slots 7 in order to increase the flow fY Y LI B 1 /65244U/ t 01/28/00 15.:x6 FAX 81a 2~0 8821 MARKS & CLERK f~J014 velocity and to reduce the consumption of the cooling water. The inserts 9 can be made of any suitable material.
Along the slots 7, the inserts 9 are connected, in any suitable manner with webs limiting the slots 7. In this way, the inserts 9 additionally increase the stiffizess ox rigidity of the plate cross-section. The inserts 9 permit to reduce the thiclrness of the plate 4 necessary for the required stiffness of the metal mold cross-section. The reduction of the thickness of the plate 4 permits, in turn, to reduce the dimension of the metal mold. ,A, further advantage of using the inserts 9 consists in the reduction of costs of the materials. The reduction of the dimensions of the metal mold perzxoits to reduce the amount of the material of which the metal mold is made, usually a copper alloy which is comparatively more expensive than steel of which the inserts 9 are made.
,A.nd important advantage of the present invention consists in the possibility of separate delivery of cooling medium for different height regions.
By a controlled influence of the heat transfer in the metal mold at different height sections, the quality of the cast billet can be improved.
01/28/00 15:36. FAX 613 230 8821 MARKS & CLERK 1~J015 Accordingly to the invention, the cooling medium can be delivered at one side of the mold plate 4 and removal at the other side. Advantageously, however, the fluid medium is delivered ai both sides and is removed at the middle or is delivered at the middle and is removed at both sides. Because in both cases, the increase of the temperature of the cooling medium dozing its flow through the cooling slots is reduced in half, the unevenness of the heat transfer over the width of the metal mold plate 4 is also reduced.
The cooling medium can flow in different slots 7 in opposite directions.
This additionally reduces the uxzevenness of the heat transfer over the width of the metal mold plate 4. This is because upon flo~uv of the cooling nZedaum in opposite directions, the increase of the temperature of the cooling medium is transmitted back to the stream of the cooling medium with a smaller .
temperature_ Though the present invention was shown and described with references to the preferred embodiments, such are merely illustrative of the present invention and axe not to be constzucted as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the NYLfH I /652a.~10I1 is 01/28/00 15:38 FAX 613 230 8821 MARKS & CLERK l~ 018 art. It is therefore not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.
N Y Ll B I /652440/ 1
Claims (14)
1. A plate for a metal mold for continuous casting of metal, comprising a funnel-shaped pouring region narrowing in casting directions to a size of a cast billet; and a rear wall provided with slots in which a cooling medium flows, wherein a course o~the slots deviates from a horizontal at least in one height section of the plate by no more than 30°,
2. A metal mold plate as set forth in claim 1, wherein the slots extend horizontally over an entire width of the metal mold plate,
3. A metal mold plate as set forth in claim 1, whereon at least one of depth and width of the slots and webs between the slots, over at least one of height and width of the metal mold plate, remain at least one of constant and variable.
4. A metal mold plate as set forth in claim 1, further comprising a plurality of inserts insertable in the slots.
5. A metal mold plate as set forth in claim 4, wherein the inserts are connectable with webs limiting the slots.
6. A metal mold plate as set forth in claim 1, comprising at least two height regions to which the cooling medium is delivered separately.
7. A metal mold plate as set forth in claim 1, further comprising at least one temperature gage for measuring temperature of at least one of the plate and the cooling medium.
8. A method of cooling a plate for a metal mold for continuous casting of metal and having a funnel-shaped pouring region narrowing in a casting direction to a size of a cast billet, and a rear wall, the method comprising the step of forming, in the rear wall of the plate, a plurality of slots through which a cooling medium can flow and a course of which deviates from a horizontal at.
least in one height section of the plate by no more than more 30°.
least in one height section of the plate by no more than more 30°.
9. A method as set forth in claim 8, further comprising the step of selecting at least one of depth and width of the slots.
10.A method as set forth in claim 8, further comprising the step of separately delivering the cooling medium to at least two height regions.
11.A method as set forth in claim 8, comprising the step of delivering the cooling medium at one side of the plate and removing the cooling medium at another side of the plate.
12.A method as set forth in claim 8, comprising the step of delivering the cooling medium at opposite sides of the plate and removing the cooling medium in middle of the plate.
13.A method as set forth in claim 8, comprising the step of delivering cooling medium in middle of the plate and removing the cooling medium at opposite sides of the plate.
14.A method as set forth in claim 8, comprising the step of flowing the cooling medium in at least two slots in opposite directions.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1999103929 DE19903929A1 (en) | 1999-02-01 | 1999-02-01 | Mold plate of a mold with funnel-shaped pouring area for the continuous casting of metal |
| DE19903929.1 | 1999-02-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2296619A1 true CA2296619A1 (en) | 2000-08-01 |
Family
ID=7896036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2296619 Abandoned CA2296619A1 (en) | 1999-02-01 | 2000-01-28 | Plate having a funnel-shaped pouring region for a metal mold for continuous casting of metal |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1025930A1 (en) |
| JP (1) | JP2000218345A (en) |
| CA (1) | CA2296619A1 (en) |
| DE (1) | DE19903929A1 (en) |
| MX (1) | MXPA00001023A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7798202B2 (en) | 2005-08-27 | 2010-09-21 | Sms Siemag Aktiengesellschaft | Wide side of a funnel mold |
| CN101641172B (en) * | 2007-01-18 | 2012-06-27 | Sms西马格股份公司 | Wall of a casting die for casting a molten metal |
| US20220241850A1 (en) * | 2019-06-21 | 2022-08-04 | EBDS ENGINEERING S.p.r.l. | Mold for continuous casting of metals, temperature measurement system and system and method for detecting breakthrough in a facility for continuous casting of metals |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100490985B1 (en) * | 2000-11-25 | 2005-05-24 | 주식회사 포스코 | Funnel Type Copper Plate For Continuous Casting Mold |
| DE10226214A1 (en) | 2002-06-13 | 2003-12-24 | Sms Demag Ag | Continuous casting mold for liquid metals, especially for liquid steel |
| DE102006037728A1 (en) * | 2006-08-11 | 2008-02-14 | Sms Demag Ag | Mold for the continuous casting of liquid metal, in particular of steel materials |
| WO2011093563A1 (en) * | 2010-01-29 | 2011-08-04 | 주식회사 풍산 | Casting mold plate, casting mold plate assembly, and casting mold including same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB954719A (en) * | 1962-04-02 | 1964-04-08 | Continuous Casting Company Ltd | Improvements in the construction of continuous casting moulds |
| GB1082988A (en) * | 1964-12-22 | 1967-09-13 | British Iron Steel Research | Moulds |
| DE2005059A1 (en) * | 1970-02-16 | 1971-08-19 | Ural Sawod Tjyselogo Mash Jeni | Mold for continuous metal caster |
| JPS5233970B2 (en) * | 1971-08-18 | 1977-08-31 | ||
| US5927378A (en) * | 1997-03-19 | 1999-07-27 | Ag Industries, Inc. | Continuous casting mold and method |
-
1999
- 1999-02-01 DE DE1999103929 patent/DE19903929A1/en not_active Withdrawn
-
2000
- 2000-01-19 EP EP00100948A patent/EP1025930A1/en not_active Withdrawn
- 2000-01-28 CA CA 2296619 patent/CA2296619A1/en not_active Abandoned
- 2000-01-28 MX MXPA00001023 patent/MXPA00001023A/en unknown
- 2000-01-31 JP JP2000022331A patent/JP2000218345A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7798202B2 (en) | 2005-08-27 | 2010-09-21 | Sms Siemag Aktiengesellschaft | Wide side of a funnel mold |
| CN101641172B (en) * | 2007-01-18 | 2012-06-27 | Sms西马格股份公司 | Wall of a casting die for casting a molten metal |
| US20220241850A1 (en) * | 2019-06-21 | 2022-08-04 | EBDS ENGINEERING S.p.r.l. | Mold for continuous casting of metals, temperature measurement system and system and method for detecting breakthrough in a facility for continuous casting of metals |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000218345A (en) | 2000-08-08 |
| DE19903929A1 (en) | 2000-08-03 |
| MXPA00001023A (en) | 2002-11-04 |
| EP1025930A1 (en) | 2000-08-09 |
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