US3255898A - Method and apparatus for the introduction of carburetion materials into melted ferrous metal baths - Google Patents

Method and apparatus for the introduction of carburetion materials into melted ferrous metal baths Download PDF

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Publication number
US3255898A
US3255898A US348376A US34837664A US3255898A US 3255898 A US3255898 A US 3255898A US 348376 A US348376 A US 348376A US 34837664 A US34837664 A US 34837664A US 3255898 A US3255898 A US 3255898A
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Prior art keywords
carburetion
crucible
melted
materials
introduction
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Expired - Lifetime
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US348376A
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English (en)
Inventor
Carli Adriano
Walter P Kollakowski
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Dalmine SpA
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Dalmine SpA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • the known feeding devices have some drawbacks, the first of which is that it is not possible to have a uniform and continuous treatment of the melted metal bath, as the treating material is introduced into the melted bath through the surface of the liquid metal in the bath;
  • the introduction of the treating material into the melted metal encounters difficulties, especially when such material is introduced into crucibles of substantial capacity; in order to avoid the deterioration of the feeders or the contact of their portions with the melted metal, they are placed in a raised position so that the treating material is introduced into the bath from above downwardly.
  • the known feeders do not permit a continuous regulation of the introduction of the treating material into the melted metal bath, Whereas such regulation is essential due to technical and economical requirements.
  • This invention solves the above problem in a simple and practical manner, especially with respect to the uniformity of treatment of the melted metal bath, even when such bath is of a substantial volume and, therefore, there are substantial head pressures of the charge stock itself, without the danger of damaging some metallic portions of the device.
  • the process comprises introducing the treating material into the melted metal bath substantially below the surface of the liquid material in the bath.
  • the device for carrying out the process set forth above comprises at least an extrusion nozzle, the aperture of which is placed below the surface of the liquid material in the bath and which is connected with forcing means provided for the forcing of the material into the bath.
  • the forcing means comprise at least a screw conveyor to assure the continuity of the feeding.
  • FIG. 1 is a vertical axial section, partially diagrampreferred embodiment of the invention.
  • FIG. 2 is a longitudinal, axial, partially sectional, partially diagrammatic view of an alternate embodiment of the invention.
  • the device comprises a shaft 10 connected by means of a suitable speed reducer with a driving motor, not illustrated.
  • a pinion 12 in mesh with a conical wheel 14 keyed on a spindle 16 carried in a conventional way by a casing 18 which supports also shaft '10.
  • Spindle 16 is arranged, by way of example, either upright or horizontal or slightly inclined, and is integral with a screw conveyor 20 fitted in a sleeve 22 which terminates, at the lower end thereof, with a flange 24 secured on casing 18.
  • a sleeve 22 at the lower end thereof has a lateral funnel 26 which leads into the chamber formed by sleeve 22.
  • the cross-section of duct 26 increases from the inlet to the outlet, that is toward the last mentioned chamber and the inlet of this duct is connected with a hopper, not illustrated, for feeding the treating material in the form of powder with a grain-size ranging within 0 and 20.
  • Sleeve 22 is connected with a complementary sleeve 28 which ends at the upper portion thereof with a flange 30 opportunely secured to the frame K of the crucible or some other member.
  • Flange 30 retains a bored plate 32 ofa suitable refractory material which forms an extrusion nozzle of which the bore or aperture 34 leads preferably into the bottom of the crucible or of the melting chamber of the furnace.
  • Sleeves 22 and 28 according to FIGURE 1 are rigidly connected with each other by means of bolts.
  • the connection between sleeve 28a and plate 30a is formed by a bent connection fitting 62.
  • connection fitting gradually increases toward the inlet of the crucible accord ing to a law experimentally found which a function of the radius of the 'bend or curve and of its length, as well as the physical conditions of the material.
  • the tapering of the fitting must range between 1:10 and 1:30. This is in order to assure that the granular material which passes through the fitting has the required conditions of compression and agglomeration while avoiding, on the other hand, occlusions, seizure or the like.
  • a simple, practical system for regulating the supplying rate, below the surface of liquid metal of the corrective material comprises a suitable metering device which permits the quantity which is introduced into the forcing means to be varied at will.
  • the powdered material from the hopper passes through duct 26, enters the screw conveyor, in order to be compressed gradually so as to result, at the outlet of the aper-' ture 34, in a block of powdered material. This block is introduced into the bath of melted metal.
  • Such system of introduction permits that the mass of liquid metal be put into intimate contact with the treating material so that said treatment can be extended to the whole melted metal bath with regularity and uniformity.
  • the gases eventually developed during the'introduction of the material pass, in an upward direction, through the melted metal mass, thereby mixing said mass and extending the reaction throughout the entire bath.
  • the block of material from the aperture 34 has such characteristics as to avoid that the melted metal enters and comes into contact with the metallic portions of the device, even when there are substantial metal head pressures. Modifications and changes can be made to the device as described and illustrated.
  • Sleeve 22 could have two or more ducts 26 for supplying the screw conveyor simultaneously or alternately with two or more powdered materials.
  • the screw conveyor 20 could be made in such a manner as to allow that its pitch and/ or the height of the threads vary from the inlet to the outlet depending upon the usage requirements and characteristics of the powdered material involved.
  • the hopper 26a is combined with a chute 50, provided with a vibrator P.
  • bores 56 are drilled in said threads to allow pins 54 secured to sleeves 22a and 28a to pass through them.
  • Sleeve 28a ends with outlet 60 which is shaped so as to house a conical end 58 of the conveyor screw 20a; said conveyor screw is connected, by means of a fitting 62, with an extrusion nozzle 64, provided with cooling chamber 66 having fittings 68 and '70 therein.
  • Motor M for conveyor screw 20a is furnished with wheels 55, sliding on rails H.
  • the present invention also covers the furnace or the crucible which, for carrying out the process according to this invention, has one or more of the devices being considered applied to the bottom and/or the walls.
  • a process for introducing at least one carburetion material into a crucible containing a melted metal bath comprising moving said carburetion material from storage, mixing and compressing said material to a desired compactness, and introducing the compacted material as a solid unit to the melted metal bath at a point below the surface of the liquid in the metal bath preferably at the lowermost portion of the crucible bottom.
  • a device for introducing carburetion materials into melted metal baths within a crucible comprising means to store the carburetion material, means for pressing the carburetion material from a granular state to a compacted state, means to move the carburetion material from said storage means to said pressing means, at least one extrusion nozzle, said nozzle passing through a wall of said crucible and being directed towards a point in the crucible below the liquid level of the molten metal, means connecting said pressing means to said extrusion nozzle, means for forcing the carburetion material through said nozzle into the metal bath, said means for moving the carburetion material from storage controlling the amount of material to be supplied to the forcing means during a time unit Without varying the speed of the forcing means thereby insuring uniform deposition of the compacted treated material in the melted metal bath.
  • a device according to claim 2 wherein said forcing means comprises a screw conveyor.
  • a device wherein the longitudinal axis of the forcing means is at an angle other than perpendicular to the surface of the crucible.
  • a device wherein the means connecting said forcing means with said eXtruder nozzle is a curved conduit, said curved conduit having a given taper which falls within the range of from 1:30 to 1:10, the cross sectional area of said conduit increasing from the outlet of the forcing means to said nozzle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
US348376A 1963-03-15 1964-03-02 Method and apparatus for the introduction of carburetion materials into melted ferrous metal baths Expired - Lifetime US3255898A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT541263 1963-03-15

Publications (1)

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US3255898A true US3255898A (en) 1966-06-14

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US (1) US3255898A (de)
CH (1) CH457526A (de)
GB (1) GB1042803A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183507A (en) * 1978-07-12 1980-01-15 Lava Crucible Refractories Co. System for introducing addition agents into vessel of molten metal
US4944162A (en) * 1989-11-07 1990-07-31 Liquid Carbonic Corporation Helical conveyor food freezer
US6244388B1 (en) * 1999-07-07 2001-06-12 Sunny Die Casting, Inc. Lube applicator for die cast machine plunger

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834631A (en) * 1928-12-05 1931-12-01 Hartford Empire Co Apparatus for making glass
US2142984A (en) * 1937-08-04 1939-01-03 Refining Inc Evaporating mechanism and process
US2452453A (en) * 1945-04-16 1948-10-26 Stok A Fire Company Inc Stoker provided with a metering control to determine fuel and air feed
US2556391A (en) * 1948-01-29 1951-06-12 Elwin A Hawk Screw conveyer apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834631A (en) * 1928-12-05 1931-12-01 Hartford Empire Co Apparatus for making glass
US2142984A (en) * 1937-08-04 1939-01-03 Refining Inc Evaporating mechanism and process
US2452453A (en) * 1945-04-16 1948-10-26 Stok A Fire Company Inc Stoker provided with a metering control to determine fuel and air feed
US2556391A (en) * 1948-01-29 1951-06-12 Elwin A Hawk Screw conveyer apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183507A (en) * 1978-07-12 1980-01-15 Lava Crucible Refractories Co. System for introducing addition agents into vessel of molten metal
US4944162A (en) * 1989-11-07 1990-07-31 Liquid Carbonic Corporation Helical conveyor food freezer
US6244388B1 (en) * 1999-07-07 2001-06-12 Sunny Die Casting, Inc. Lube applicator for die cast machine plunger

Also Published As

Publication number Publication date
GB1042803A (en) 1966-09-14
CH457526A (de) 1968-06-15

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