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
  • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
  • B22D11/0611—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a single casting wheel, e.g. for casting amorphous metal strips or wires

Definitions

• the invention relates to a device for casting thin strips of metal or metal oxides according to the preamble of claim 1.
• WO 88/02288 it is also known to use casting wheels with a horizontal axis of rotation and, instead of the melt spinning process, to pull the melt out of a narrowly defined gap between the nozzle body and the casting wheel surface by means of the casting wheel.
• the pouring nozzles used here can be provided with feeds from above or below the outlet opening of the pouring nozzle. In both types of feed, the nozzle inflow upstream of the pouring nozzle must be deflected in the melt feed system, which increases the cost of the nozzle and makes the process more susceptible to faults.
• the invention has for its object to further improve the casting of strips with particular attention to the metal feed technology to the casting wheel and an improved nozzle construction.
• the casting of strips can be further improved with the solution according to the invention.
• the metal feed on the essentially vertical drum surface of the casting wheel provides new design options for metal feed systems and for casting nozzles. In particular, it enables essentially straight-line melt feeds both from above and from below the metal outlet opening of the pouring nozzle. Furthermore, the shape and type of the melt container or the metal feeds into the melt container can be freely designed. With the interaction of the drum shell surface of the casting wheel and the casting nozzle according to the invention, however, this can also be simplified. This leads to greater efficiency of the casting process and increased operational reliability.
• the vertical drum surface of the casting wheel can be arranged both on the inside and on the outside of a drum. According to one exemplary embodiment, simple nozzle arrangement and gap control can be achieved if the metal outlet opening is directed towards an essentially cylindrical outer casing of the drum.
• the metal outlet opening of the pouring nozzle can be round or square.
• the metal outlet opening of the casting nozzle is provided in the form of a slot and the slot length is essentially parallel to the axis of rotation.
• the pouring nozzle is tubular and the longitudinal pipe axis is arranged essentially transversely to the direction of movement of the drum jacket surface.
• the longitudinal axis of the slot-shaped metal outlet opening can be arranged parallel to the longitudinal pipe axis in the pipe jacket surface.
• Tubular refractory parts in particular pipes with a round cross-section, are available in various refractory qualities as standard parts.
• such tubular standard parts can be closed at one end of the tube and immersed in a melt container at the other end of the tube.
• the pouring nozzle can be arranged completely separate from the melt container.
• a bore or a slot can be made as a nozzle opening for the metal outlet in the pipe jacket. If the melt is to be fed from below the metal outlet opening to the nozzle, then according to an additional embodiment, the tubular casting nozzle can be immersed in a pressure vessel. If the pouring nozzle has a tubular round cross section, it is advantageous to flatten the outer tubular surface of the nozzle in the area of the metal outlet opening in order to achieve a specific gap configuration.
• FIG. 1 shows a schematic view of a casting device for narrow strips
• FIG. 2 shows a schematic view of a further example of a casting device
• FIGS. 2A is a view of the section line A - A of FIGS. 2 and
• FIG 3 shows a vertical section through a further example of a casting device.
• FIG. 1 2 is a casting wheel for casting thin strips.
• the casting wheel 2 has an essentially vertical axis of rotation 3.
• a metal feed 4 connects a metal storage container 5 to a casting nozzle 6, the metal outlet opening 7 of which is directed towards a rotating cooling surface of the casting wheel 2.
• An essentially vertical drum jacket surface 8 serves as the cooling surface, and a gap distance A of less than 1 mm is provided between the metal outlet opening 7 and the drum jacket surface 8.
• the cylindrical drum outer casing 8 can have an axis of rotation inclined by a few degrees.
• the metal strip detached from the casting wheel 2 is shown at 10.
• a funnel-shaped metal feed 14 is connected to a tubular pouring nozzle 16.
• a slot-shaped metal outlet opening 17 is directed onto the drum jacket surface 8 of the casting wheel 2. It understands It goes without saying that either the entire casting device or the melt feed shown in arrow 19 in the feed hopper 14 can be arranged in a vacuum housing or in a protective gas atmosphere.
• the length 18 of the slit-shaped metal outlet opening 17 and the metal feed direction 23 in the pouring nozzle 16 up to shortly before the metal outlet opening 17 is essentially parallel to the axis of rotation 3.
• a width 11 of the slot-shaped outlet opening 17 is 5 to 50 times, preferably 10 to 30 times, the desired thickness of the strip to be cast.
• the tubular pouring nozzle 16 is flattened on all sides around the metal outlet opening 17, so that a surface 12 is formed. This can be concave and match the radius of the casting wheel 2.
• the casting wheel is essentially cylindrical.
• a round, tubular metal feed 30 is formed at one end as a pouring nozzle 37 and is provided with a slot 31 as a metal outlet opening. Above the slot 31, the tube end is closed with a cover 32.
• a vent 45 is provided for rapid venting at the start of pouring.
• a heatable vessel 33 with heating elements 34 is provided as the feed.
• the vessel 33 is closed in a pressure-tight manner with an appropriately designed cover 35. In this example, this cover 35 serves as a suspension for the metal feed 30, the pouring nozzle 37 and the vessel 33 on a holding device 36.
• the holding device 36 is arranged as close as possible to the metal outlet opening 31 of the pouring nozzle 37 so that the Gap distance A can be observed exactly. It can be 0.05-0.5 mm, preferably 0.1-0.3 mm. In the area of the gap distance A in round pouring nozzles 37, the nozzle jacket is flattened on both sides of the slot-shaped metal outlet opening 31.
• the feed 30 with the pouring nozzle 37 can be immersed in the melt container 33 shortly before the start of pouring and, for example, can also be suspended separately from the latter.
• pressure is generated above the metal bath via a gas supply 38, which presses this up into the casting nozzle 37.
• the melt container 33 can be continuously supplied with melt during the casting operation via a metal feed line, not shown.
• the melt is pressed up with a pressure P into the tubular nozzle 37 in the direction of arrow 39 and deflected by about 90 degrees according to arrow 40 shortly before the slot opening 31.
• the inflowing melt is redirected from the outflow direction in the outlet opening 31 into the strip withdrawal direction 41. Due to the rapid solidification on the drum surface 8, surprisingly no melt drips downward in the defined gap A.
• the band on the upper and lower edges 42 and 43 is of the same quality and the same in thickness.
• the gap distance A is generally set in parallel in the case of small band widths. However, it is conceivable that the gap distance A can be chosen to be unequal for the production of large bandwidths, in particular in the case of vertical cast pipes which are fed from below. He can, for example. enlarge to the top. Likewise, the width 11 (FIG. 2A) of the slit-shaped metal outlet opening can be chosen to be unequal over the length 18 (FIG. 2A) in order to control band thickness variations or to optimize edge formations.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 1988
  • 1988-07-20 CH CH2776/88A patent/CH676337A5/de not_active IP Right Cessation
• 1989
  • 1989-07-04 US US07/490,560 patent/US5025851A/en not_active Expired - Fee Related
  • 1989-07-04 JP JP1506944A patent/JPH03500390A/ja active Pending
  • 1989-07-04 EP EP89907058A patent/EP0378626A1/de not_active Withdrawn
  • 1989-07-04 WO PCT/CH1989/000128 patent/WO1990000946A1/de not_active Application Discontinuation

Non-Patent Citations (1)

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