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
  • B22D11/055—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
  • B22D11/10—Supplying or treating molten metal
  • B22D11/11—Treating the molten metal
  • B22D11/112—Treating the molten metal by accelerated cooling
• • 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
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
  • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling

Definitions

• the invention relates to a mold plate with the features in the preamble of patent claim 1.
• the plastic deformation also causes a gap to form between the broad and narrow sides of a mold. Liquid steel can penetrate into the gap between the narrow side and the broad side of a mold. This can damage the mold plates during a width adjustment. In the worst case, the strand shell can tear open below the mold in the outer corner area of the slab.
• the attachment points of the mold plates to the rear support plates or the so-called water boxes are arranged at a short distance from one another and are provided in a relatively large number.
• the fastening points which are arranged at a close distance from one another, predetermine a specific course of the cooling channel.
• the heat dissipation viewed over the entire hot side, can have undesirable inhomogeneities. Inhomogeneous heat dissipation in turn causes material stresses, particularly in the meniscus area of the mold plate. The material tensions can be so high that plastic deformations result. In extreme cases, the copper alloy can even soften.
• there is the fundamental risk of elastic deformation of the mold plate caused by the temperature gradient between the hot and cold sides of the mold plate.
• the inserts be connected to fastening points in the cooling surface using brackets or fastening bolts. It is also proposed to avoid hot spots in those areas in which the mold plate is connected to a support plate or a water box via fastening bolts.
• at least one cooling channel from the point of view of an attachment point to the support plate or to the water tank on the opposite side of the casting side of the mold plate should extend to below the attachment point. This can improve the cooling in the base area of the fastening points.
• JP 2006 320 925 A discloses an additional cooling duct below an attachment point.
• the fastening point serves to receive a fastening bolt for connecting a mold plate to a support plate.
• the cooling ducts bordering on the outside are not widened so that they extend under the fastening point, but a further cooling duct is created below the fastening point.
• the production is comparatively complex.
• DE 10 2004 001 928 A1 discloses a liquid-cooled mold for the continuous casting of metals, the mold plates being connected to a support structure by means of fastening bolts.
• the mold plates or the mold tube and the support structure are connected to one another without jamming, a working gap being present between the support structure and the mold plate or the mold tube.
• the working gap is located to the side of the attachment points and in particular to the side of a threaded insert arranged there, which is part of the attachment point or forms it.
• the invention has for its object to show a mold plate in which the risk of bulging is reduced. Deformation of the mold plate during continuous casting should be minimized.
• the mold plate according to the invention has a casting side and a rear side facing away from the casting side.
• the mold plate consists of a copper alloy. It can be combined with other concrete plates to form a mold, such as that used for the continuous casting of molten metals.
• At least one cooling duct open to the rear is arranged in the rear. It has a cooling surface opposite the pouring side.
• An insert is arranged in the cooling channel in order to form a cooling gap between an inner surface of the insert and the cooling surface. In the casting operation, cooling water is passed through this cooling gap in order to cool the mold plate via the cooling surface and thereby also the casting side.
• the insert is connected to fastening points in the cooling surface via fastening bolts.
• the area of the cooling surface can also be referred to as the groove base of a cooling.
• the invention does not exclude that there are further connection points between the insert and the mold plate.
• the use is preferably only via the fastening points in the cooling surface, i. H. connected to the mold plate within the cooling channel.
• the inserts are usually not connected to the mold plate in the area of the cooling surface, but rather outside the area of the cooling surface. With the arrangement of the fastening points directly on or in the cooling surface, however, the area between the adjacent walls of the cooling channel is bridged. Fixing points are arranged in the area of the walls of the cooling channels, via which the mold plate can be screwed to a supporting steel support plate or to a water tank. For better differentiation, the points for connecting the mold plate to the support plate are referred to as fixing points in this invention, while the points for connecting the insert to the Mold plate can be referred to as attachment points. In both cases, the connection is made in the same way, namely via the fastening bolts or fixing bolts, that is to say via screw connections.
• the fastening bolts can be arranged as stud bolts on the mold plate, so that nuts have to be screwed onto the fastening bolts.
• the reverse can also be fastening bolts which have a screw head and are screwed into threaded receptacles at the fastening points or fixing points. Mixed constellations of studs and bolts are possible.
• the main advantage of the arrangement of the fastening points according to the invention is that the inserts, which are supported on the back of the support plate anyway, are not only used to determine the cross section of the cooling gaps and to increase the flow rate, but rather to contribute to plastic deformations by bulging to prevent in the area of the cooling gap.
• the fastening points or the fastening in the area of the cooling surface considerably improves the dimensional stability of the entire mold plate during the casting operation, in particular if a large number of fastening points are provided.
• At least as many fastening points are preferably provided as fixing points.
• the doubling of the number of connection points (fastening points including fixing points) means that the mold plate is extremely stiffened without the wall thickness of the mold plate having to be increased on the casting side.
• the attachment points are, in particular, island-like elevations relative to the cooling surface.
• the cooling surface is preferably a substantially flat surface. Individual webs can be located within the cooling surface be arranged facing the inner surface of the insert. The individual cooling gaps through which cooling water flows are formed between these webs or the cooling surface and the inner surface.
• the attachment points are preferably located in the area of the webs, so that the respective cooling gap can still run essentially straight.
• the individual webs in the cooling surface preferably also run straight and parallel to one another, ie in the longitudinal direction of the respective cooling channel.
• Two or three webs are preferably arranged within a cooling channel. Depending on the number of webs, there are fastening points in the area of each web within a cooling channel. The distance between the fastening points in the transverse direction of the channel therefore corresponds to the distance between the webs. The distances are related to the center distance. There are preferably two fastening points spaced apart in the transverse direction.
• the island-like elevations in the cooling surface also have the advantage that the attachment does not take place via an intervention in the cooling surface, but via attachment points on the cooling surface.
• the thickness of the mold plate between the casting side and the cooling surface in the region of the fastening points is at least not less than in the other regions of this cooling channel. There is therefore no weakening of material in the area of the fastening points. This in turn has advantages with regard to power transmission and also with regard to the homogenization of heat transfer. The material reserve for reworking the casting side is retained.
• the thickness of the mold plate does not fluctuate too much below the cooling surface.
• such hotspots could arise in the case of very large, island-like elevations, since the cooling water does not reach the core area of an island-like elevation.
• the heat dissipation below such an attachment point could therefore be reduced.
• at least one cooling gap extends from the point of view of the attachment point to the casting side to below the attachment point.
• the attachment point is undercut to a certain extent. The undercut can be done on one or both sides.
• the undercut be designed so that the web with the same width and / or height also runs below the attachment point, while the attachment point itself only begins above the web. As a result, the web below the attachment point is cooled in the same way as outside the attachment point. There are no hotspots. The heat dissipation remains uniform and homogeneous over the entire length of the web.
• the multiple attachment points are preferably not only offset in the longitudinal direction, but also in the transverse direction of the cooling channel. As explained above, they are in particular aligned with respect to the respective webs.
• the attachment points of two adjacent webs do not necessarily have to be in the same length section, i.e. H. be arranged directly next to each other in the transverse direction. In particular, they can be arranged offset to one another in the longitudinal direction. Starting from two webs, there is therefore an arrangement of fastening points which not only increases the number of fastening points in the transverse direction, but also in the longitudinal direction.
• the respective attachment points are located, in particular in the longitudinal direction, at a distance from the attachment points via which the mold plate is attached to the support plate.
• the attachment points can for example be arranged in a zigzag pattern or trapezoidal pattern.
• the aim is to support the thin-walled mold plate in the area of the cooling channel as evenly as possible. If necessary, individual attachment points at the same height, i.e. H. be arranged in the same length section.
• the inserts are supported on the support plate in the installed position. They therefore have a height or thickness, at least in sections, on support projections in their edge region, which extends over the entire depth of the cooling channel from the back of the mold plate to the cooling surface.
• rear support projections which extend to the rear of the mold plate, are preferably arranged in the longitudinal section of the cooling channel in that there is a fastening point.
• the mold plate can directly over the webs or the attachment points Support on the rear support plate. If the inserts overlap a web delimiting the cooling duct, or in general form over a wall of the cooling duct, the insert can absorb tensile forces which arise due to thermal expansion in the casting side. The mold cannot stand out from the insert due to the attachment point in the cooling channel and this, in turn, cannot be shifted towards the casting side because it is supported on the web or the wall.
• the support projections can overlap the webs or the wall.
• the support projections have a dual function in that they absorb tensile and compressive forces and, depending on the position (front of the support plate / rear of the web), can transfer the adjacent surfaces to adjacent components (mold plate, support plate).
• support projections directly opposite one another on both longitudinal sides of an insert, specifically at the height of an attachment point.
• the support projections can fuse with one another or a single, correspondingly wide support projection can be provided.
• the insert between the longitudinally opposite supporting projections preferably has a greater thickness than the regions arranged in the longitudinal direction next to the supporting projections. The greater thickness results in a higher flexural rigidity of the insert in the area of the fastening bolts or in the area of the fastening points.
• connection between the mold plate and the insert is designed such that the mold plate is due to the high thermal Influences are not prevented from expanding under casting conditions.
• this can be achieved by arranging a working gap between the mold plate and the insert in the area of the attachment point.
• the working gap is very small.
• the mold plate is floating at the attachment points opposite the insert.
• the attachment point, ie the mold plate transversely to the cooling channel, ie laterally in the longitudinal and transverse directions of the cooling channel should be displaceable without jamming.
• the floating bearing is not to be understood in such a way that the mold plate tends to bulging due to the additional degrees of freedom and is therefore exposed to plastic deformations.
• the fastening bolt is therefore located in a sufficiently large through hole which is so large that the mold plate with the fastening bolt arranged thereon can move laterally to the insert, but only to a limited extent perpendicularly to the insert.
• the position of the insert relative to the mold plate is fixed by the system on the back of the support plate.
• the fastening bolt is screwed to the fastening point by incorporating a screw locking element.
• the screw locking element is supported on a sleeve which is located between a bolt head and the fastening point.
• the fastening bolt forms a unit with the sleeve and the screw locking element, as well as the mold plate, this unit being laterally displaceable relative to the insert.
• the through hole, in which the fastening bolt is arranged preferably has a gradation in diameter, so that there is a contact surface for the bolt head or a protruding collar of a sleeve, on which the bolt head is supported.
• the contact surface in combination with a working gap defines the degree of freedom of the mold plate perpendicular to the cooling surface.
• a minimal gap is sufficient to enable the mold plate to be laterally displaced relative to the insert without increasing the risk of bulging.
• the width of the working gap is preferably less than 0.2 mm. Even if coolant can penetrate the working gap, the working gap in the sense of the invention is not designed as a coolant channel, but has a substantially smaller width.
• the working gap can be set differently within the scope of the invention, and the arrangement and the number of fastening points can also be varied in order to achieve the most homogeneous possible cooling and constant rigidity of the mold plate.
• the expression “jamming-free connection between the mold plate and the insert” is to be understood in such a way that only slight material stresses arise in the copper material of the mold plate when it shifts to the insert in the longitudinal or transverse direction due to thermal influences. Touching the insert and the attachment point with low friction values are not critical. Only jams, blockages due to high prestressing between the insert and the mold plate in this area should preferably be avoided.
• the bolt heads of the fastening bolts are arranged completely recessed in a stepped through-hole in the insert.
• the somewhat greater thickness of the inserts in the area of the through bores is due to the fact that the support projections are arranged along the side of the insert and that the insert is to have high torsional rigidity between the fastening points and the support projections.
• the application acts as a yoke in this area. However, this does not mean that particularly long bolts must be used. To save material, the bolt heads can be completely sunk in the through hole.
• the through hole preferably has gradations from both sides.
• the bolt head can be countersunk in the through hole.
• the through hole has a contact surface in the form of an inward collar.
• the island-like raised fastening point is arranged on the opposite side of the through hole or the collar.
• the attachment point preferably engages completely in the insert a. There is a sufficiently wide gap on the circumference of the attachment point so that the mold plate can be laterally displaced to the through hole.
• FIG. 1 shows the prior art and serves to explain the technological background. It is not an embodiment for which protection is sought. The invention is explained in more detail below on the basis of an exemplary embodiment shown purely schematically in FIG.
• FIG. 1 shows a perspective view of a partial area of a mold plate 1, partly in section.
• the reference numerals which are used to explain the mold plate 1 of FIG. 1 are used for components of essentially the same content in the mold plate 1 according to the invention as shown in FIG.
• the mold plate 1 of FIG. 1 has a casting side which faces away from the viewer and a rear side 2 which faces the viewer. In the installed position, the back 2 is supported on a support plate, not shown.
• hot melt on the casting side 2 is to be cooled by the fact that heat is absorbed by the mold plate 1 and is dissipated via cooling water by being passed through cooling gaps 4, which in turn are located in cooling channels 5.
• the casting direction in this mold plate 1 corresponds to the vertical direction.
• the cooling channels 5 therefore extend parallel to the casting direction from top to bottom. They run parallel to each other.
• Inserts 6 are located within the cooling channels 5, which limit the cooling gaps 4 to the rear 3.
• the inserts 6 are configured in a U-shaped cross section. Its inner surface 7 facing the cooling gaps 4 bears against webs 8 which point from a cooling surface 9 of the cooling channels 5 in the direction of the rear side 3 of the mold plate 1.
• the webs 8 determine the height of the cooling gaps 4.
• the spacing of the webs 8 from one another determines the width of the cooling gaps 4 and thus overall the cross-sectional area of the cooling gaps 4.
• a high pressure prevails in the cooling gaps 4 during the casting operation.
• the inserts 6 are therefore supported on a support plate, not shown, during operation.
• the inserts 6 have a plurality of support projections 10 which are arranged at a distance from one another and extend to the rear 3 of the mold plate 1.
• the inserts 6 are on their long sides contoured and have support projections 11, which are profiled towards the long side so that they are adapted to the contour of the walls of the cooling channels 5, so that the inserts 6 are oriented both in the longitudinal direction L and in the transverse direction Q within the cooling channels 5.
• the inserts 6 can only be removed from the cooling channels 5 towards the rear 3.
• Two adjacent cooling channels 5 are separated from one another via webs 12. Within the webs twelve there are fixing points 13 at a distance from one another. They have threaded inserts 14, by means of which the mold plate 1 together with the inserts 6 can be screwed onto the support plate to be arranged on the rear. As a result, the respective insert 6 is also precisely oriented and held within the cooling channels.
• the mold plate 1 according to the invention has the essential difference that 5 fastening points 15 with threaded inserts 16 are arranged on the respective cooling surfaces 9 of the cooling channels.
• the fastening points 15 point towards the rear 3 of the mold plate 1.
• Fastening bolts 17 are arranged in through bores 18 in the respective insert 6 and screwed into the threaded inserts 16 of the fastening points 15.
• the bolt head 21 of the fastening bolt 17 rests on the fastening point 15 via a sleeve 19 and a screw locking element 20.
• a collar 22 in the through hole 18 is held with play between the attachment point 15 and the sleeve 19. In a manner not shown, there is a narrow working gap of less than 2/10 mm width between the fastening point and the sleeve 19.
• the diameter of the through hole 18 is dimensioned so large in all its length ranges that a slight lateral displacement of the fastening point 15 is relative to use 6 can be done. In this way, thermally induced tensions between the insert 6 and the mold plate 1 are avoided.
• the attachment points 15 are each located in the area of the webs 8. Since there are two webs 8 at a parallel distance from one another, there are two rows of attachment points 15. The attachment points 15 of the adjacent rows are arranged offset to one another in the longitudinal direction L of the cooling channel 5. Since the webs 8, which limit the cooling gaps 4, approximately at equal intervals are arranged relative to one another, the respective fastening points 15 are located approximately at the same distance from a left and a right wall of the respective channel 5 and thus approximately at the same distance from the fixing points 13 arranged there. This results in a high density of fastening points 15 or fixing points 13, via which the mold plate 1 can be connected to the inserts 6 or a support plate.
• the attachment points 15 are island-like elevations. They start at a distance from the cooling surface 17, i.e. H. where the webs 8 end. Since the fastening points 15 have a greater width than the webs 8, the fastening points 15 are undercut from the rear to the casting side from a vertical viewing direction. The respectively adjacent cooling gap 4 extends below the respective fastening point 15, but only to the extent that the width of the web 18 specifies. In the sectional view in FIG. 2, the fastening points 15 appear to be constricted on the side. These constrictions under the fastening points 15 therefore have the form of segments which are diametrically opposite one another and are separated from one another by the web. The web 8 is, as it were, the connecting link between the fastening point 15 and the cooling surface 9.
• the through bores 18 are located between two diametrically arranged support projections 10, which are each arranged on a long side of the insert 6. There are further support projections 11 at a distance from the aforementioned support projections 10.
• the support projections 10, 11 serve, as in the prior art embodiment, for rearward support of the inserts 6 on the support plate, which is not shown in detail.
• the wider support projections 11 are located where the respective insert 6 has a greater thickness than the regions of the insert 6 adjacent in the longitudinal direction L. Other regions mean those longitudinal sections in which there are no fastening points 15 or through holes 18.
• the thicker areas between the opposing, wider support projections 10 serve as a yoke and are intended to absorb forces which are exerted by the mold plate 1 in the area of the cooling surface 9 and via the fastening points 15 on the inserts 6.
• the areas between the aforementioned support projections 10 are particularly rigid and solid. In the other areas, where the inserts 6 only have the function of limiting the cooling gaps 4, but without absorbing forces via additional fastening points 15, do not require such massive support.
• the inserts 6 can not only absorb forces acting on the cooling surface 9 from the webs 8 in the direction of the inserts 6 and transmit them to the support plate, but can also absorb forces which point in the opposite direction.
• the support projections 10 overlap the web 12 between two cooling channels 5. In this area, the insert 6 is wider than the cooling channel 5.
• the web 12 has a somewhat lower height in this area.
• the support projection 10 does not protrude beyond the rear side 3, but ends in the same plane as the fixing points 13 and the other regions of the web 12. If there is no web, as in the case of a cooling channel 5 on the edge, the support projection 10 can be in a rear Grasp bag 23, which is a recess in the back 3. The support projection 10 therefore does not protrude from the rear 3.
• the mold plate 1 according to the invention Due to the large number of fastening points 15 between the inserts 6, the mold plate 1 according to the invention has a higher bending stiffness in order to avoid plastic deformations due to thermal influences. Compared to the prior art, the homogeneity of the heat dissipation is retained.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)

Priority Applications (11)

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Citations (3)

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• 2019
  • 2019-01-30 DE DE102019102313.0A patent/DE102019102313B3/de active Active
• 2020
  • 2020-01-08 WO PCT/DE2020/100005 patent/WO2020156607A1/de not_active Ceased
  • 2020-01-08 MY MYPI2021004112A patent/MY197206A/en unknown
  • 2020-01-08 MX MX2021008501A patent/MX391424B/es unknown
  • 2020-01-08 EP EP20707544.1A patent/EP3917700B1/de active Active
  • 2020-01-08 PL PL20707544.1T patent/PL3917700T3/pl unknown
  • 2020-01-08 JP JP2021549423A patent/JP7105400B2/ja active Active
  • 2020-01-08 US US17/417,274 patent/US11383292B2/en active Active
  • 2020-01-08 RS RS20230669A patent/RS64564B1/sr unknown
  • 2020-01-08 CN CN202080008230.6A patent/CN113348043B/zh active Active
  • 2020-01-08 ES ES20707544T patent/ES2955012T3/es active Active
  • 2020-01-08 KR KR1020217027185A patent/KR102392933B1/ko active Active
• 2021
  • 2021-07-28 ZA ZA2021/05340A patent/ZA202105340B/en unknown

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