Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
  • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
  • B22D41/01—Heating means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B14/00—Crucible or pot furnaces
  • F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
  • F27B14/061—Induction furnaces
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D3/00—Charging; Discharging; Manipulation of charge
  • F27D3/14—Charging or discharging liquid or molten material
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B14/00—Crucible or pot furnaces
  • F27B14/02—Crucible or pot furnaces with tilting or rocking arrangements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B14/00—Crucible or pot furnaces
  • F27B14/08—Details peculiar to crucible or pot furnaces
  • F27B2014/0875—Two zones or chambers, e.g. one used for charging

Definitions

• a pocket for heating and pouring liquid metals is provided.
• the present invention relates to an oven or a heating pocket for holding liquid metal, in particular metals melting at high temperature, such as cast irons, steels or superalloys. It relates in particular to bags of the type comprising a main element which comprises a cavity delimited by a refractory lining and intended to be charged with molten metal, this cavity being provided with a filling opening and with a metal outlet orifice communicating with said cavity, and means for heating the metal. The cavity is intended to be loaded with molten metal maintained at temperature.
• the invention proposes to provide an oven or a heating pocket for maintenance of liquid metal overcoming all the drawbacks mentioned above.
• the object of the invention is to provide a heating bag, the design of which facilitates the flow of liquid metal, in particular during the operations for removing liquid metal, as well as all subsequent measurement, cleaning and maintenance operations. .
• the subject of the invention is a pocket, of the aforementioned type, characterized in that said cavity comprises a bath foot area and a reserve area, the volume of the bath area being less than the volume of the reserve zone, the bath foot zone being located at the lower part of a main cylinder of axis YY inclined in particular at an angle of about 30 ° in the service position of the pocket, the shape of said cavity being devoid of dead angle so as to obtain a regular flow of the liquid metal and allowing access through said filling opening, to each point of the cavity, in particular for the purpose of hot scrubbing of the ladle.
• said cavity comprises a filling cylinder terminating in said filling opening, and the liquid metal reserve zone communicating with this cylinder, with the supply cylinder and with the orifice.
• said cylinders are of parallel axes in a vertical plane, the filling cylinder having its axis offset upward relative to the axis of the main cylinder; the filling cylinder has a diameter greater than the diameter of the main cylinder, so as to form the reserve zone of liquid metal, said reserve zone being connected to the supply cylinder by a connection zone of substantially frustoconical shape provided with rounding;
• the axes of the cylinders included in a vertical plane are inclined upwards towards the filling orifice in particular at an angle of the order of 30 °, in the service position of the bag; this in order that the pocket can contain a large amount of liquid metal while minimizing the base.
• the filling opening comprises a closing device to limit the heat losses of the metal and / or to inert the surface of the metal.
• said heating means comprise an inductor which surrounds a cylindrical heating zone of the same axis and preferably of the same diameter as the supply cylinder and are in particular attached to the main element in a removable manner.
• the installation shown comprises a heating pocket 1 composed of three sub-assemblies: a liquid metal heating assembly, represented in the form of an inductor assembly 2, an orifice 3 for the outlet of the metal 4 and a main element 5.
• the function of the inductor assembly 2 is to maintain the metal at a certain temperature.
• the inductor assembly 2 surrounds a heating zone 6 in the form of a deep bowl delimited by a refractory lining 7.
• This refractory lining 7 is surrounded by an inductor coil 8 at medium frequency intended for heating the liquid metal 4 by induction, the assembly being housed in a carcass element 9.
• the inductor assembly 2 also includes means for attachment to main element 5, which can be any suitable means available to those skilled in the art, and in particular a system of flanges and bolts 10.
• the main element 5 of the pocket 1 comprises a carcass 11 in which is placed a lining 12 made of refractory material. Inside this lining 12 is a cavity 13 made up of several geometric volumes, and comprising at least one opening.
• the heating zone 6 of the inductor assembly 2 is also cylindrical, of the same diameter as the main cylinder 14 of the main element 5, and inclined like it upwards at an angle relative to the horizontal, of so as to define a common axis YY. In the embodiment of the invention which is shown, this angle is of the order of 30 °, and the diameter of the heating zone 6 and of the main cylinder 14 is 225 mm.
• the internal cavity 13 of the main element 5 also comprises a third volume constituted by a reserve zone 15 of liquid metal 4.
• This reserve zone 15 constitutes the downward extension of a cylinder 16 for filling the axis' Y 'parallel to a common axis YY of the heating zone 6 and of the main cylinder 14.
• the axis Y' -Y 'of the filling cylinder 16 is therefore parallel, in a vertical plane, and offset upwards relative to the axis YY, and the filling cylinder 16 has a diameter substantially greater than the diameter of the main cylinder 14.
• the main cylinder 14 and the filling cylinder 16 are arranged so as to have their lower generatrix 17 common.
• connection zone 18 has a substantially frustoconical shape provided with rounds 19, 20 making a progressive junction between the two cylinders 14, 16
• the cylinders 14, 16 can be provided with a slight draft oriented towards the opening of filling 21, so as to allow easy manufacture of the main element 5 and its reserve zone 15 by molding of refractory material around a core.
• the useful capacity of the temperature-maintaining pocket 1 which corresponds to the volume of cavity located between a low mark A near the lower end 22 of the outlet orifice 3 and a high mark B corresponding to the maximum filling of the bag, is of the order of 550 kg for alloys with a density close to 7.
• this useful capacity it suffices to change the dimensions of the elements of the bag 1.
• the inductor winding 8 is traversed by a frequency current of 500 Hz associated with a power of 250 K so as to obtain a uniform temperature of all the liquid metal 4 without creating excessive stirring which would be detrimental to the holding of the refractory.
• the filling opening 21 of the filling cylinder 16 is closed, during the use of the bag 1, by a filling door 23 fixed to the carcass 11 in a removable and sealed manner.
• the pocket 1 operates in the following manner: starting from a clean pocket and free of dirt, the filling door 23 is opened and the internal cavity 13 is loaded with the main element with liquid metal 4 until it reaches the level indicated by the mark B. Through the opening 21, we proceed to the skimming of the impurities possibly present on the surface of the metal , and the temperature of the metal is measured. The filling door 23 is then closed in a sealed manner.
• the pocket After a predetermined period, the pocket is returned to its initial position.
• the bag can also be used by adapting pressurization means through the cover 23 or the carcass 11 and the lining 12.
• pressurization means allow the liquid metal to be removed through the outlet orifice 3 without having to rotate the bag.
• This type of device can be used for the gravity casting of foundry parts; the use of pressure to precisely control the regularity of liquid metal samples.
• the level of the liquid metal in the reserve zone 15 of the main element 5 has gone down to the low level A.
• the bag 1 is filled as indicated above or the casting campaign.
• the temperature maintenance bag 1 meets the objectives set, due to the particular shape and the arrangement of the elements of the reserve zone 15 of the main element 5, in connection with the shape and arrangement of the opening 21 of the main element 5.
• this shape is specially suitable for casting metal, as well as scouring, measuring and maintaining the pocket 1.
• the inductor winding 8 is traversed by a medium or low frequency current, in particular from 50 to 1500 Hertz.
• the bag In order to avoid thermal shocks on the refractory lining 12 and / or to freeze the liquid metal 4 when filling the bag 1, the bag needs to be preheated before filling. This preheating is carried out by means of a burner operating on oxygen and natural gas, placed at the level of the filling opening 21.
• the presence of the outlet orifice 3 allows the evacuation of the combustion products, in particularly in the absence of evacuation, the water vapor emitted by this type of burner is likely to generate dissolved gases

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Vertical, Hearth, Or Arc Furnaces (AREA)
• Sampling And Sample Adjustment (AREA)
• Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
• General Induction Heating (AREA)
• Treatment Of Steel In Its Molten State (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9468479

Family Applications (1)

Country Status (8)

Families Citing this family (4)

Family Cites Families (7)

• 1994
  • 1994-10-31 FR FR9413155A patent/FR2726211B1/fr not_active Expired - Fee Related
• 1995
  • 1995-10-30 ES ES95939307T patent/ES2136889T3/es not_active Expired - Lifetime
  • 1995-10-30 US US08/836,523 patent/US5882582A/en not_active Expired - Fee Related
  • 1995-10-30 CA CA002204137A patent/CA2204137C/fr not_active Expired - Fee Related
  • 1995-10-30 AU AU41189/96A patent/AU4118996A/en not_active Abandoned
  • 1995-10-30 EP EP95939307A patent/EP0785836B1/de not_active Expired - Lifetime
  • 1995-10-30 DE DE69510811T patent/DE69510811T2/de not_active Expired - Fee Related
  • 1995-10-30 WO PCT/FR1995/001433 patent/WO1996013349A1/fr active IP Right Grant

Non-Patent Citations (1)

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