| 摘要 |
<p>1475713 Tapping molten metals ASEA AB 21 Aug 1974 [23 Aug 1973] 36699/74 Heading F4B Molten metal is tapped from a tiltable vessel 11 Fig. 5 of the kind having at least one channeltype induction unit 12 and a conduit 18 for feeding inert gas e.g. argon to an opening 17 which is above the melt when the container is tilted to the tapping position, and a closable pouring hole 14 through which, during tapping, the flow of metal is controlled by regulating the pressure of the inert gas supplied through conduit 18, the temperature of the melt being controlled by the induction unit or units. The vessel 11 is a converter in which the metal is first purified. The vessel is charged in an approximately upright position the top 13 being removed for the purpose. The top 13 is replaced, Fig. 4, and refining agent is added through conduit 19. The metal is maintained at the desired temperature by the induction unit 12, the heat causing stirring of the added materials. Inert or reducing gas is introduced into the channel of the induction unit to cause circulation of the melt and cleaning of the channel walls. The taphole 14 may be closed by a metal plate or by a sliding valve. The rate of tapping of the metal or the level of molten metal in the casting apparatus is measured and used to control valves regulating the pressure of inert gas supplied over the surface of the metal so that the tapping rate is maintained at a desired level. Similarly the temperature of the metal in the converter or in the casting apparatus is measured and used to control the supply of energy to the induction unit. After tapping a reservoir of metal remains in the channel of the induction unit. The converter is then returned to the upright position for recharging, being again filled with argon to protect the lining.</p> |
