Abstract:
The invention concerns a method for heating a metal melt, in particular molten steel covered with a casting powder, introduced via a submerged outlet into an ingot mould of a continuous casting plant. In order to ensure uniform heat dissipation over the ingot mould and constant frictional forces between the latter and the casting shell, the heat energy is introduced at given points into the surface of the melt bath and the heat energy point on the surface of the melt bath is brought to a predetermined line.
Abstract:
A conveyor belt of a continuous strip-casting device for casting strips of metal, particularly steel, which belt is guided by a driven drum and a drum horizontally adjacent to the driven drum and displaceable for tensioning the belt. The belt rests in this connection on a support arranged between the drums and the side thereof facing away from the cast strip is cooled. The conveyor belt has, on the side remote from the cast strip, uniformly distributed blind holes. The blind holes are separated by webs of a minimum width. The total surface area of the webs is 0.15 to 0.4 times the total surface area of the belt. The bottoms of the blind holes have a wall thickness which, upon heating by the cast strip with simultaneous cooling of the inside surface of the blind holes, permits a bulging of the bottom of less than 1 mm.
Abstract:
A method and apparatus for treating residual or waste materials that can be recycled energetically, especially light-weight refuse from shredders, which, reduced in size and classified, are stored in bunkers. The residual or waste material is fed by portions from the bunkers to a supply trough in a metal melting furnace, especially an electric arc furnace for melting steel. After a predetermined time, the residual material is placed by portions into a sluice that can be closed in a gas-tight manner. After the sluice is closed, the residual material is subjected to an oxygen-containing gas, the pressure of which is higher than the pressure at the furnace head of the metal melting furnace, until the pressure within the sluice exceed the pressure in the furnace head. The sluice output opening facing toward the furnace vessel bottom is opened after the pressure within the sluice exceeds the pressure in the furnace head and the residual material is conveyed pneumatically into the chamber part. Nozzles in the chamber part inject oxygen into the shaft to encourage combustion and to assist the acceleration of the residual or waste material through the chamber and into the bottom area of the furnace. The residual material is then submerged in the metal melt located in the bottom area of the metal melting furnace for complete conversion or incineration.
Abstract:
In a process for casting metal strip, in particular steel strip, the liquid metal is discharged from a casting nozzle which has the same width as the strip onto a continuously moving, cooled conveyor belt, and the plane of the nozzle mouth is set for the thickness of the metal strip to be cast, i.e. at an acute angle to the plane of the conveyor belt. To maintain the casting speed at the nozzle mouth on the conveyor belt, i.e. to prevent shearing forces of the flow layers and thus a speed profile with negative components, the invention proposes that with a conveyor belt running at an inclination to the horizontal in the casting direction, the inclination of the conveyor belt in the casting direction is set as a function of the casting speed, which should be equal to the conveyor belt speed, and as a function of the material parameters of the liquid metal.
Abstract:
A process and device for melting scrap in a direct current-driven closed shaft furnace. The scrap is fed with an annular cross-section into one end of the furnace and hot gases which flow against the falling scrap are sucked below the scrap feeding area via an outer cylindrical wall of the scrap column. The inner free surface of the ring-shaped flat cross-section of the scrap is reduced before the scrap reaches the melting zone. In the melting zone, the scrap is exposed to an electric arc at the center of the flat cross-section. The arc furnace has a cathode that is held by an electrode bearing device which is formed as a concentric pipe with respect to the central axis of the furnace vessel. At one end the pipe is conically tapered and at the other end it is supported on the shaft of the furnace by bearing arms.
Abstract:
In a casting device for the continuous production of metal strip using an endless cooling and transport belt; a distributor is constructed as twin chamber with an entrance and charge chamber, and an exit and discharge chamber communicating with the entrance chamber, a nozzle is provided at the exit and discharge chamber, the distributor, at least in the range of the discharge chamber, is gas tightly closed and is mounted in an inclination-adjustable frame; a gas pressure controllable source is connected to the discharge chamber and controlled in response to thickness variations of the strip; a distance measuring device (ram pressure) is arranged at the casting nozzle for measuring the distance of the casting nozzle from the casting belt; a controller responds to the measuring output of the distance measuring device and provides for controlling the elevational and vertical disposition of the distributor within said frame; another controller varies elevation of the upper belt stringer, also in response to thickness variations of the strip being made.
Abstract:
Apparatus for controlling the oscillations of a mold for continuous casting of metal, the mold being mounted on a table which is connected, in turn, to three spaced apart drives and three load relief springs; three displacement path transducers track each of the drives; a source of reference signals provides reference signals representing the desired oscillation, as to contour, amplitude and rate; actual and reference signals are compared by and in stages which provide correction signals for the drives.
Abstract:
A strip casting plant with side limits arranged closely adjacent to a carrying belt. The side limits, and preferably the supply device for molten metal, are capable of vibrating and are connected to a device for producing vibrations. The adhesion of solidified material can thus be prevented.
Abstract:
A method and device for positioning the mouth of a consumable lance that conveys gaseous and/or solid media into a metallurgical vessel containing liquid metal. The lance is guided tangentially to the furnace vessel in a plane which lies above the liquid level of the metal situated inside the vessel. In the mouth area of the lance outside the vessel, the lance is bent toward the vessel interior through a predetermined radius in order to position the lance mouth in the shape of a fan. The lance is then pushed through the side wall of the vessel into the interior of the same to reach or maintain a desired position of the lance mouth.
Abstract:
A charging device for closed arc furnaces having at least one electrode around which the charge material is concentrically fed into the furnace. Conveyor devices run in protected fashion in an annular chamber disposed above a furnace cover. A plurality of magnets are suspended from the conveyor devices into the upper vessel of the furnace. A material feeding device enters the upper vessel through a passage in the upper vessel wall. The passage is provided with a sealing device to prevent gases from the upper vessel from escaping or the material feeding device may be enclosed in a gas-tight lock. The magnets pick-up the charge material from the material feeding device and deposit it concentrically around the electrode.