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
  • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds

Definitions

• the invention relates to a continuous casting mold with a coolant channel which is formed by a, the molten metal facing mold inner wall as a hot side, a mold outer wall as a cold side and a right and left side wall.
• a mold wall of a continuous casting mold which consists of a Kokilleninnenplatte and one connected to the Kokilleninnenplatte via screw connections water tank, wherein the mold inner plate on its side facing the water tank webs with grooves extending therebetween, are arranged in the filling pieces ,
• the grooves serve as cooling channels for a cooling liquid, usually water.
• the patches serve to reduce the channel cross-section, so that the speed of dilution of the cooling liquid in the cooling channel increases.
• Continuous casting molds with cooling channels are furthermore known from the documents DE 101 22 618 A1, DE 100 35 737 A1 and DE 101 38 988 C2.
• a mold for the continuous casting of molten metals, in particular steel is known, with cooling channels such as cooling grooves, cooling slots or cooling holes in the Kokillenh designedseite opposite contact surface.
• the heat transfer of the mold is improved in that the geometric configurations of the heat-transmitting surfaces of a cooling channel or a group of cooling channels in shape, cross-sectional area, circumference, interface properties, orientation to the contact surface, arrangement and / or arrangement density compared to the contact surface of the local formation of heat flux density and / or temperature of the con- contact surface in the casting operation, and in particular in GittyLite Kunststoffe adapted.
• the liquid melt flows from a continuous casting distributor through a dip tube into an oscillating, water-cooled copper mold.
• the melt temperature drops below the solidus temperature and it forms a thin strand shell, which is withdrawn in the casting direction.
• the thickness of the strand shell increases until the strand is completely solidified.
• casting speeds of 6 m / min and more are achieved today.
• Typical local heat flux densities are on the order of up to 12 MW / qm.
• the dissipated by the coolant heat flow is u. a.
• the wall roughness and the flow rate and thus also on the degree of turbulence.
• the higher the degree of turbulence on the coolant side the more intense the mixing and the more heat is dissipated.
• the heat-transferring area can be increased, however, this enlargement has narrow limits.
• fouling Since the deposits have a very low thermal conductivity, fouling in the case of Kokillenkühlung leads to a strong increase in the copper temperature and thus to a reduced service life of the mold.
• the invention has for its object to provide a continuous casting mold, in which the recrystallization process of the mold material or the material of the walls of the coolant channel, which is dependent on the operating temperature and operating time is delayed, the life of the mold and the turbulence increases and a homogeneous Mixing of the coolant is achieved.
• the coolant channel is formed with turbulence generating elements.
• turbulence-generating elements By introducing turbulence-generating elements is generally achieved a greater mixing of the coolant.
• the turbulence-generating elements increase the heat-transferring area of the coolant channel or of the mold walls. The interaction of both measures, i. Turbulence generation and enlargement of the heat transfer surface, improves the local heat transfer from the walls of the coolant channel or from its walls to the coolant, which then dissipates the heat.
• the basic principle of all turbulence generating elements is based on the turbulence-induced mass impulse and energy transport.
• the heat transfer in the coolant channel of continuous casting molds is improved according to the invention.
• the turbulence generators lead to higher local heat flow densities, ie the heat dissipated per unit area is increased.
• the turbulence, both near the wall and in the area of the core flow, is increased and a homogeneous mixing is achieved.
• the turbulence-generating elements a better mixing of the cooling water is achieved and the temperature level in the copper is lowered, whereby the dependent on the operating temperature and duration recrystallization process of the mold material or the material of the walls of the coolant channel delays.
• the material of the mold or the mold walls is for example copper, partially copper or another material. Furthermore, the contamination and the tendency to deposit are reduced by the increased turbulence and the greater shear forces on the hot side of the cooling channel.
• a first embodiment of turbulence-generating elements consists of horizontal steps in the coolant formed, for example, by rectangular profiles extending over the entire width or portions of the coolant channel.
• a second and third embodiment of turbulence generating elements is in the form of tetrahedrons and winglets. In these forms, inwardly rotating swirl pegs are induced, which lead to an even more intensive mixing of the coolant. Vortex pegs can be observed for example at the end of a wing profile or behind motor vehicles, where they are in principle undesirable.
• the turbulence-generating elements are arranged offset one after the other on the hot side, for example, the distance being largely determined by the spatial extent of the upstream recirculation area.
• the turbulence-generating elements can also be installed on the cold side, since the effect of the recirculation extends to the hot side.
• a combination of tetrahedrons on the cold side and horizontally mounted steps on the hot side of the coolant channel is also possible. It is also conceivable to install the turbulence-generating elements only in the entry of a coolant channel or only at the level of the casting mirror in order to keep the manufacturing effort within limits.
• the heat transfer surface is through the turbulence elements slightly increased, in the tetrahedra described by about 6%. In this way, the local heat flux density is increased. Due to the dimensions of the turbulence elements not too large, the pressure loss can be kept low.
• the basic mode of operation of the coolant channel according to the invention can be demonstrated by means of numerical flow simulations (CFD - Computational Fluid Dynamics).
• Figure 1 in a spatial representation of a part of a continuous casting mold.
• FIG. 2 is a sectional front view of the continuous casting mold with turbulence-generating elements according to a first embodiment
• FIG. 3 is a sectional front view of the continuous casting mold with turbulence-generating elements according to a second embodiment
• FIG. 5 shows a sectional side view of the continuous casting mold with turbulence-generating elements.
• Figure 1 shows a spatial representation of a part of a continuous casting mold 1 with a coolant channel 2, the one facing the molten metal, mold inner wall 3 as a hot side, a mold outer wall 4 as Cold side and a right side wall 5 and a left side wall 6 is formed.
• turbulence-generating elements 7, 9 and 10 are mounted on the mold inner wall 3, the hot side, and protrude into the coolant channel 2.
• FIG. 2 shows, in a sectional front view, the coolant channel 2 in which 11 turbulence-generating elements 7 in the form of tetrahedrons are mounted on the mold inner wall 3 in two rows.
• the tetrahedra point with their tip counter to the flow direction 8. By such an arrangement, a building resistance is generated. Behind the tetrahedron, the coolant behaves turbulently.
• the tetrahedra can also be arranged offset.
• FIG. 3 shows turbulence-generating elements 9 in the form of horizontal steps.
• the horizontal steps are formed, for example, by a rectangular bar (see FIG. 5) which extends over the entire width of the coolant channel 2.
• FIG. 10 Another form of the turbulence-generating elements 10 is shown in FIG. These turbulence generating elements 10 are in the form of winglets. These, e.g. Winglets known from aircraft wings are either aligned one behind the other in rows 11 fixed to the mold inner wall 3 or are distributed on the mold inner wall, as indicated by the lowermost winglet.
• Winglets known from aircraft wings are either aligned one behind the other in rows 11 fixed to the mold inner wall 3 or are distributed on the mold inner wall, as indicated by the lowermost winglet.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (15)

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• 2007
  • 2007-01-17 DE DE102007002405A patent/DE102007002405A1/de not_active Withdrawn
  • 2007-12-11 WO PCT/EP2007/010773 patent/WO2008086856A1/de active Application Filing
  • 2007-12-11 EP EP07847053A patent/EP2121218A1/de not_active Withdrawn
  • 2007-12-11 TW TW096147157A patent/TW200909099A/zh unknown
  • 2007-12-11 BR BRPI0718884-6A patent/BRPI0718884A2/pt not_active IP Right Cessation
  • 2007-12-11 CN CN2007800500903A patent/CN101646515B/zh not_active Expired - Fee Related
  • 2007-12-11 US US12/448,953 patent/US20100065242A1/en not_active Abandoned
  • 2007-12-11 JP JP2009545093A patent/JP2010515580A/ja not_active Withdrawn
  • 2007-12-11 UA UAA200908561A patent/UA92985C2/ru unknown
  • 2007-12-11 CA CA002670037A patent/CA2670037A1/en not_active Abandoned
  • 2007-12-11 MX MX2009007659A patent/MX2009007659A/es unknown
  • 2007-12-11 RU RU2009131056/02A patent/RU2414986C1/ru not_active IP Right Cessation
  • 2007-12-11 KR KR1020097008292A patent/KR20090077925A/ko not_active Application Discontinuation
• 2008
  • 2008-01-16 AR ARP080100195A patent/AR064927A1/es not_active Application Discontinuation
• 2009
  • 2009-03-26 ZA ZA200902185A patent/ZA200902185B/xx unknown

Non-Patent Citations (1)

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