US2128943A - Formation of encased structures by direct casting - Google Patents

Description

Sept; 6, 1938. E. B. HUDSON FORMATION OF ENCASED STRIJCTURES BY DIRECT CASTING Filed April 14, 1956 2 Sheets-Sheet 1 INVENTOR. Bow/1v .5 H00 sa/v.

ATTORNEYS.

Sept. 6, 1938. E. B. HUDSON FORMATION OF ENCASED STRUCTURES BY DIRECT CASTING Filed April 1, 1956 r 2 Sheets-Sheet 2 MM 1 w. ma w mm w m. 1 W n M.

Patented Sept. e, was 2,128,943

UNITED STATES PATENT OFFICE FORMATION OF ENCASED STRUCTURES BY DIRECT CASTING Edwin E. Hudson, Middleto'wn, Ohio, asslgnor to The American Bolling Mill Company, Middletown, Ohio, a corporation of Ohio Appiication April 1, 1936, Serial No. 72,128 .5 Claims. (Cl. 22--5'l.2)

My invention relates to the formation of enspace3 for molten metal d. Downwardly this oricased metallic structures by direct casting, and lice is constricted to form a narrow, elongated while structures of the same metal may be made, throat '5, through which the metallic combination yet my invention is of particular utility in the may pass as cast. The refractory member 2 is 5 casting of metallic structures comprising dilferent supported by partition members 6, which are in- 5 metals. I shall describe my invention in an exemtegral with the elements 8, forming a constricted plary embodiment comprising the casting of strip sizing and cooling throat. The bottom walls 8 of metal structures having a body of iron or mild the housing complete, with the members aforesteel, and facings of some protective metal, such, said, spaces t for cooling fluid, which may be 10 for example, as stainless steel, copper, or the like. caused to enter and to be withdrawn from the 1; The form of strip material which I shall describe spaces 9, through suitable connections It for pipis one either suitable for direct fabrication, or ing. The cooling walls I may, with advantage, be capable of being reduced in gauge either on the provided with fins H to increase the rate of heat conventional .hot mill, or the conventional cold transfer. l5 mill. The metallic composite, such as the exem- In the use of this apparatus, two strips, indiplary one to which I have referred, having a core cated at E2 and i3, may be passed over idler rollers or body of less expensive metal and faclngs of i4 and i5, and caused to enter the space 3 in the more expensive metal, is of interest in the arts, refractory member 2, the strips passing downparticularly in that such a strip for most uses has wardly along the outer faces of the orifice, as all of the advantages of the more expensive metal shown. The molten metal d in the reservoir thus 20 at a small fraction of the cost. comes in contact with these strips while the strips The various objects of my invention will be are backed up by the refractory walls of the memclear to one skilled in the art upon reading these her 2, so that the heat of the molten metal very specifications, and I accomplish these objects by quickly raises the temperature of the strips 12 that certain construction and arrangement of and Hi to the degree required for welding. The parts, and in that process of which I shall now strips, and a portion of the body metal derived describe the aforesaid exemplary embodiment. from the reservoir 3, pass down through the con- For a clearer understanding of the nature of my strlcted portion 5, and into the throat between invention, reference may now be made to the the cooling walls I, where the composite strip is 0 drawings, wherein: sized and solidified, and emerges as shown at 16. Figure 1 is an elevational view, with parts in The metallic composite thus formed may be fursection, of a direct casting device. ther cooled by directing blasts of cooling fluid Fig. 2 is a schematic and semi-diagrammatic against it, as from pipes l1.

view showing a casting member, together with In Fig. 2, 1 have shown the strips l2 and I3 auxiliary equipment withwhlch my process may being withdrawn from coils l8 and I9, and. passbe carried out. ing respectively, through pre-heating furnaces 20 Briefly, in the practice of my invention, I cast and 2|. These furnaces may be employed to a molten metal to form the body of the product raise the temperatures of the strips'to that debetween two strips of metal which form the fac-- gree necessary for the perfect operation of the ings. The molten body metalisbrought into conapparatus under conditions of a desired speed. 40

tact with the facing strips in a welding zone, I have shown the molten metal being delivered where the molten metal is isolated from cooling into the reservoir 3 from a ladle 22, or other demeans, and where the temperature of the facing sired container. The composite metal strip may strips may quickly be raised by the molten metal be cooled by the members H to the proper temto the welding temperature. In my apparatus perature for rolling, as by means of mill rolls 23 45 there is a second zone where the temperature of and 24, either for reduction in gauge, or in order the metallic combination, formed as I have indito give the strip a rolled structure. Since the cated, is very quickly reduced, and the metal strip strip emerges vertically from the casting device, accurately sized by suitable cooling means. I have shown it passing over an idler roll 25, and

A convenient embodiment of my casting device being coiled as at 26. 50 is shown in Fig. 1, and comprises a casing I. In It will be understood that the operation may the upper part of this casing, there is a member be made continuous by welding strip metal to 2, preferably of refractory material, and having gether, instead of using individual coils therecentrally thereof an orifice of elongated form, of, as shown at H! and l9.

which is widened at the top to provide a reservoir The speed of withdrawal of the metallic com- 55 bination l6 from the casting apparatus, may be controlled in connection with the heat of the molten metal 4, and the temperatures to which the strips l2 and I! are raised in the furnaces 20 and 2|, to give a smooth, continuous operation, resulting in the formation of perfect castings.

Modifications may be made in my invention without departing from the spirit thereof.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A process of forming metallic combinations by casting, which comprises passing a pair of preformed metallic strip members in converging paths to a cooling and sizing device, supporting said strips in said converging paths by means of heat insulative supporting members, providing means forming a closure between said heat insulative members at the side edges of said strips whereby to form a reservoir at said supported portions of said strips, maintaining in said reservoir a supply of molten metal and passing said strips and a portion of said molten metal through said sizing and cooling means, said insulative supporting means acting to retain heat in said preformed metallic strips as transmitted thereto by said molten metal, so that said strips are raised to a welding temperature necessary to form a firm welded joint with said molten metal prior to the time said strips and metal reach said sizing and cooling device.

2. The process of claim 1 in which the strips of metal are preheated before being brought into contact with said molten metal.

3. A direct casting device comprising a refractory member shaped interiorly to provide a reservoir for molten metal and a constricting portion, means for leading metal strips into said reservoir and along the walls thereof, so that said bath of molten metal is held therebetween, and cooling and sizing means adjacent said refractory member, through which said metallic strips and a portion of said molten metal may be passed.

4. In combination, a housing, a refractory block in said housing shaped to provide a reservoir and a constricted throat, walls in said housing, some of which support said refractory block, and others of which, in connection with said supporting walls, define a chamber holding cooling fluid, and form a constricted sizing and cooling throat for a metal member formed by direct casting, means for leading metallic strips into said reservoir and along the side walls thereof, and means for withdrawing a direct cast metallic article therefrom.

5. In combination, a housing, a refractory block in said housing shaped to provide a reservoir and a constricted throat, walls in said housing, some of which support said refractory block, and others of which, in connection with said supporting walls, define a chamber holding cooling fluid, and form a constricted sizing and cooling throat for a metal member formed by direct casting, means for leading metallic strips into said reservoir and along the side walls thereof, means for withdrawing a direct cast metallic article therefrom, and including means for pre-heating said metallic strips prior to their passage into said reservoir.

EDWIN B. HUDSON.

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