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
  • B22D11/16—Controlling or regulating processes or operations
  • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould

Definitions

• the invention relates to a method for controlling the liquid cooling of continuous casting molds, in particular of water-cooled continuous casting molds, which consist of copper or have a copper coating or a copper alloy coating.
• Continuous molds for continuous casting of metals such as aluminum or metal alloys such as steel have a funnel-shaped Eingello Scheme and usually two mutually braced mold plates, the pocket-shaped broad side wall sections and at a distance to have coolant channels.
• the solidification of the molten metal or the metal alloy is accompanied by a transition of the existing heat in the melt on the mold.
• copper or a copper alloy is preferably used as mold material, whereby the high thermal conductivity of these substances is utilized.
• coolant channels are provided in or on the mold walls, which are flowed through by a coolant for faster heat dissipation.
• the improved heat dissipation achieved in the prior art by a combination of a highly conductive mold material in conjunction with optimized water cooling is critical to the productivity of the continuous casting plant, on the one hand, to provide premature partial solidification casting immediately after the molten material has been filled to produce in the Eingello Kunststoff, on the other hand also cooled in the course of the cast strand by heat transfer to the mold inner wall and thus solidified.
• the movement of the cast strand inevitably leads to a wear of the mold walls, which is why there has been no lack of attempts in the past, by surface coatings on the casting side, z. B. by copper-cobalt-gerylium alloy to increase the wear resistant, but these coating materials have a poorer thermal conductivity. Compromises in terms of thermal conductivity and wear resistance have been found in part with nickel-copper alloy coatings.
• the cause of the increased wear of the copper mold on the casting side is effectively counteracted by preventing the copper from quenching due to excessive cooling.
• overcooling of the copper results in softening of copper and copper alloys, which can be prevented if the copper mold is purposefully slowly cooled outside of the casting operations.
• This can be achieved in the simplest case by switching off the cooling circuit or by throttling the water cooling circuit, such as by setting a lower flow rate. With this measure, a softening of the copper, which otherwise occurs due to excessive cooling, is avoided and maintains its original wear resistance.
• the material temperature is measured at several points over the mold width and / or the mold length at the casting side facing the steel and used to control the fluid flow in the cooling channels.
• This measure also serves for homogeneous cooling with low cooling rates, which does not exceed the critical value of increased cooling rate at which copper softening occurs.

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Citations (2)

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• 2009
  • 2009-06-03 DE DE200910023677 patent/DE102009023677A1/de not_active Withdrawn
• 2010
  • 2010-04-22 EP EP10160681.2A patent/EP2266726A3/fr not_active Withdrawn

Patent Citations (2)

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