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
• • 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
  • B22D11/008—Continuous casting of metals, i.e. casting in indefinite lengths of clad ingots, i.e. the molten metal being cast against a continuous strip forming part of the cast product

Definitions

• the invention relates to a method and a device for producing thin metal strands, in particular made of steel, with thicknesses of less than 20 mm, in which an uncooled, cleaned metal profile of low energy potential is brought into contact with a metal melt at least on one side of its cross section and this is brought to crystallize , the thickness of the metal strand being adjusted by the length of the contact time.
• the molten metal is crystallized on cooled surfaces without a connection between the cooled surfaces and the crystallized material. Continuous casting therefore prevents the casting material from binding to the molds used in order not to destroy the work result.
• the technology of continuous casting is limited by the strand thicknesses that can be achieved, whereby a minimum strand thickness is taken into account and not an increasing strand thickness.
• achievable strand thicknesses “upward” are approximately 300 mm with appropriately wide strands, cross-sectional formats of 300 mm by 2,100 mm being referred to as jumbo strands.
• the limits of the continuous casting technology in the direction of the thinnest possible strands are drawn on the one hand by the pouring conditions of the casting materials into the continuous casting molds because the technology of the immersion spouts fails here for dimensional reasons.
• the specified temperature of 1100 degrees C is not reached in the core of the steel strip, and no diffusion of the molten metal occurs in the steel strip. With wall thicknesses of 4.6 mm, the two materials were not even bonded.
• the invention is therefore based on the object of proposing a method for producing thin meta strands, in particular made of steel with thicknesses of less than 20 mm, which is not only close to End product (sheets, strips, pipes, profiles) leads lying product and requires only a minimal amount of cold and hot molding, but can be produced in its structure homogeneously and in economical quantities.
• the object is achieved according to the invention at the outset by the fact that a metal profile selected with wall thicknesses of 0.1 to 1.4 mm is kept in contact with the molten metal within such a time, which in function with an energy potential difference between the low
• the energy potential of the uncooked metal profile and the higher energy potential of the molten metal is before the melting of the metal profile, and in accordance with the maximum permissible contact time, a metal strand with an approximately 6 to 10 times the total strand thickness, consisting of the metal profile and crystals and melt material deposited thereon (without phase limits) the molten metal is pulled out.
• This process initially has three main advantages:
• the material cycle is limited to ten times the total strand thickness to 10%, so that the process works economically.
• large bundles of thin metal profiles can be handled more easily.
• layer materials from several thin metal profiles.
• the process also requires relatively little developer and can be carried out with relatively simple devices. It is particularly advantageous here that, for example, sheet-like and strip-shaped natural edges are created which support the rolling process.
• the method according to the invention means minimal conversion costs from the liquid product (such as steel) to the finished product.
• Another advantage is that the process can be carried out discontinuously and alternatively continuously.
• a particular advantage is to set or control the thickness of the metal strand by changing the contact time between the uncooled metal body and the metal melt, in contrast to continuous casting.
• continuous casting relatively complex devices are available here for adjusting the mating side plates of a continuous casting mold, so that the thickness cannot initially be changed during continuous casting.
• the thin metal profiles also make it possible not only to use completely identical materials of the molten metal with respect to the metal profile.
• a metal profile strand with a fixed cross-section and with a fixed structural state is introduced into a related metal melt and is passed through on all sides in the defined time, in which it is at maximum at the solidus temperature inside is heated and that then the metal profile strand surrounded by the molten metal is subjected to controlled cooling outside the molten metal.
• the metal profile strand is moved from bottom to top through the molten metal. As a result, a constant thickness of the melt material applied is achieved over the circumference of the cross section.
• the metal profile strand is moved in several cycles by a metal melt in each case. This process step serves to produce particularly thick metal strands.
• the invention also allows thin strands of metal to be constructed from different layers of material. For this purpose, it is provided that the metal profile strand is moved through different melt pool containers in several cycles.
• An advantageous device for carrying out the method is designed in such a way that a metal melt container is provided which has an inlet opening for the metal profile strand and an outlet for the entire strand, that a melt inlet is present and that the inlet opening and / or the outlet opening for the metal profile strand against the Metal melt is sealed.
• Temperature control of the molten metal located in the molten metal tank takes place in that the molten metal tank is provided with heating and / or cooling elements.
• FIG. 1 shows a vertical cross section through the melt container
• FIG. 2 shows a cross section through the uncooled metal body or the uncooled metal profile strand
• FIG. 3 shows the cross section through the metal profile strand according to FIG. 2
• FIG. 4 a metal profile strand provided with a thicker cross section
• FIG. 5 the overall strand obtained belonging to FIG. 4, FIG. 6 a vertical cross section through an alternative
• the process for producing thin metal strands takes place in a molten metal container (1), the content of which can be regulated to the desired temperature by the heating and / or cooling elements (2), so that the higher energy potential mentioned Metal melt (4) can be provided. If necessary, the molten metal (4) can be circulated by an electromagnetic stirring device (3) to add an additional To achieve temperature uniformity in the molten metal (4).
• the uncooled metal profile (5) has a low energy potential, even if it is introduced preheated.
• An uncooled metal profile strand (5a) which has a predetermined, defined cross section (5b) and a solid structural state, is used for a continuous process.
• Metal melt (4) and metal profit (5) or metal profile strand (5a) normally show an essentially identical analysis. During the pulling through the metal melt (4), such a contact time is maintained that the metal profile (5) or the metal profile strand (5a) inside (5c) is heated to at most solidus temperature.
• a rectangular cross-section (5b), ie a strip cross-section is assumed as the metal profile (5).
• the metal profile strand (5a) is moved from below through the inlet opening (1a) upwards, through the molten metal (4).
• the entire strand (6) can be kept in an atmosphere protecting against oxidation until it has cooled or has entered a molding machine in which the entire strand (6) is subjected to a hot-forming and / or a cold-shaping process.
• the thickness of the entire strand (6) can be increased by several cycles as described, the metal istrang also cooling between the cycles in a space filled with inert gas. This cooling should be kept within limits in order to apply the melt material (free of phase boundaries) to the metal strand after each cycle.
• molten metal (4) with different materials in the individual melt pool containers (1), ie to produce so-called layered materials.
• the metal melt (4) consumed in the process is continuously fed under the appropriate metallostatic pressure through a melt inlet (7). replaced, the metal melt skewer (7a) being checked.
• Escaping the molten metal (4) through the molten metal container (1) made of refractory materials is prevented by a refractory seal (8) with a pressing device (8a), through a pressure container (9) surrounding it, in which an inert gas, such as argon, is subjected to excess pressure is introduced, sealed.
• the pressure vessel (9) has gas inlets (10) for this purpose and a lip seal (11) is arranged on the inlet opening (1a) to prevent gas leakage.
• the cross section (5b) of the metal profile strand (5a) is selected to be rectangular, but there is still a natural edge (13) for the total strand thickness (12) on the broad sides, as has been determined by tests.
• the natural edge (13) is particularly advantageous for further rolling of the metal strand.
• the process described here can be repeated a number of times, with new metal melt (4) being transferred to the underlying, already solidified or solidified layers at the latest after the rolling process.
• FIG. 6 shows the melt container (1) as described.
• the container base (14) around the rollers (15) and (16) is either curved (right half of the drawing) or the roller (16) forms the container base (14).
• the Rollers (15) and (16) can be driven in opposite directions.
• the roller can consist of metal and, if necessary, be cooled.
• the roller (15) consists of ceramic or poorly heat-conducting materials.
• the rolls (15) and (16) can do hot forming work.
• the feed direction of the metal profile (5) or of the metal profile strand (5a) from top to bottom that is to say contrary to the exemplary embodiment according to FIG. 1.
• a capacitive utilization of the energy potential is relatively cold metal body in contrast to the conductive heat dissipation during continuous casting.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)
• Wire Processing (AREA)
• Metal Rolling (AREA)
• Conductive Materials (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Adornments (AREA)

Priority Applications (8)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6790311

Family Applications (1)

Country Status (7)

Cited By (7)

Families Citing this family (5)

Citations (5)

Family Cites Families (4)

• 1986
  • 1986-05-27 WO PCT/DE1986/000219 patent/WO1987007192A1/de active IP Right Grant
  • 1986-05-27 AT AT86903224T patent/ATE65436T1/de not_active IP Right Cessation
  • 1986-05-27 EP EP86903224A patent/EP0311602B1/de not_active Expired - Lifetime
  • 1986-05-27 DE DE8686903224T patent/DE3680547D1/de not_active Expired - Fee Related
  • 1986-05-27 KR KR1019880700089A patent/KR950002966B1/ko not_active IP Right Cessation
  • 1986-05-27 DE DE86DE8600219T patent/DE3690741D2/de not_active Expired
  • 1986-05-27 JP JP61502971A patent/JP2655143B2/ja not_active Expired - Lifetime
• 1988
  • 1988-01-26 DK DK036688A patent/DK165581C/da active

Patent Citations (5)

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