US1180677A - Mold-top. - Google Patents

Description

G. E. THACKRAY.

MOLD TOP.

APPLICATION HLED MAR. 23, 1914.

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MOLD-TOP.

Speeificationof Letters Patent.

Patentedl Apr. 25, 119116..

Application filed March 23, '1914. Serial No. 826,478.

v of the adaptations of which is for use on the upper portion of an ingot mold, the ingot mold vitself being ordinarily made of metal.

My mold top comprises an outer casing or fiask preferably made of metal, open'at the top and'bottom, and` adapted to set on the top Vof an ingot mold. The inner sides of this flask are provided with a non-conducting refractory lining which maybe' composed of Sand, loam, admixtures of sand and loam, fire-br'ick Or other similar material. rl`he principal essentials of my lining are that it should be much more non-conducting with respect to heat: than metal and at the same time sufliciently refractory to reasonably withstand the heat to which it will be subjected by contact with lmolten metal such as iron, steel onother metals.

My top being in place on an ingot mold,

' the molten metal is poured into' the mold and substantially fills it`and the top, and

' on account of the non-conductingquality period of time very much 'longer' than the of the lining,'the molten metal is maintained'f filuid' at, and near the top portion for a other parts of'the Originally molten metal which are adjacent to, or in contact with, the conductin-g portions of the metal mold.

By means of this arrangement thel cavityproduced in the ingot or casting, due to shrinkage, is located entirely 'within the sink-headX portiomwhich is contained within my non-conducting top, leaving thew other part of the ingot solid and free from shrinkage cavities or pipes. For example, in the manufacture ofisteel, by reason of the concentration of the shr'inkage .cavity within the sink-head, x][ vprovide an ingot or casting which requires the minimum amount of discard, preparatory to further use in the manufacture of blooms,'billets, slabs, bars, structural shapes or other Sections.

After an ingot has been cast into a mold provided with my top, the portion adj acent to the 'non-conducting lining remains fluid for av considerable period of time during which the shrinkage cavity 'forms therein, the metal which originallywas in said cavity feeding downw'ardly to supply the shrinkage in the other portion of the ingot. Before the metal has entirely set in the interior portion a further quantity of metal maybe poured into the preliminary Shrinkage cavity to insure that there' i s suficient fluid metal to make a solid ingot, although in most cases this is n'ot necessary. After ,the outershell of the .ingot has been suificientlyv set, it may be removed from the mold and allowed to soak or its heat become equalized pre'ferably in a Vertical pit furnace.

Having thus. given a general description of.my invention, I will now, in order to make 'th e-\matter more clear, refer to the accompanying sheet of drawings 'forming part of this specification, and in` which like characters refer to like parts r- Figure 1 is a tran'sverse sectional .elevati'on of the upper portion of an ingot mold provided with my top, secured in position thereon, as shown, the flask or casing in this case being provided with projeetions on its inner surface to retain the non-conducting lining, the structure shown in this figure being adapted. to set directly on the top of a mold.

Fig. 2 is 'a view similar to Fig. 1, taken on' the line H'fll of Fig. 3, with the exception that no roughenings are provided on the inner side /of the flask or vcasini'g, besides which, the non-conductin'g lining extends downwardly within the mold* and its form is maintained by means of anchors or foundry nails e'mbedded therein'during its formation. Figf is a top plan view. ofthe mo-lditop-,andupper portion of a mold 'corresponding-to 'Fig 2. The top plan viewV of the mold shown infiFig. 3 is the same mold as is shown in section in Figs. 1 andg,l

the section shown in Fig. 1 being taken ver-l tically through. the -axis of 'the mold and passing through the hold down lugs 3, while ing material therein.

the section shown in F ig. 2 is taken on the line II 'I1 of F ig. 3 and passes through the lifting lugs 2. The bottom mold 1 itself shown in all these illuxstrations is the same, whereas the tops illustrated in Figs. 1 and 2 are slightly different, as the top shown in Fig. 2 has its refractory lining projecting downwardly into the mold and is held by these projections and conseq'uently the metal fiask 01' casing shown in Figs. 2 and 3 is not provided with projectingfianges to coperate with the hold down lugs' 3. as is the case with the top illustrated in Fig. 1, in which latter figure the mold' top is secured on the mold by the coperation of the flanges 6 and the hold down lu'gs 3 and the hoi'seshoe clamps 7.

Referring now to the characters of reference on the drawings:-1 represents the ingotmold in general, which, in this case, is shown with the large end upward, as this style is preferred in order to produce solid ingots, as compared with a mold, the larger end of which is downward. The lifting iugs of the mold are indicated at 2 in Fig. 2, and similar, but difi'erently shaped, lugs or flanges are indicated at 3 in F ig. 1. The body portion of the ingot is indicated at 4, the flask or casing is indicated generally at 5; the lower flange of the form shown in F ig. 1 is indicated at 6, and in this figure,

7 represent horseshoe clamps adapted to' secure the top in position onthe mold. The lower inwardly projecting fianges 8 shown on the flask serYe to retain the non-conduct- The upper retaining flange or anchor is indicated at 9, while the lifting lugs of the fiask or casing are indicatedat 10. Gaggers or inwardly extending pin`s or projections are indicatedA at 11, which further serve to hold the refractory non-conducting material shown in Fig. 1, whereas no such gaggers are shown in Fig. 2, as in some cases they may be dispensed with. The non-conducting refractory lining is indicated at 12, the shrinkage cavity in the sink-head portion of the ingot or'castin'g is indicated at 13, and as shown in Fig. 2, the anchors for holding the downwardly projecting portions of the lining to the other portions are indicated at 14. The upper or sink-head portion of the ingot is indicated at 15. The lower portion of the non-conducting lining which projects downwardly within and adjacent to the sides of the mold is indicated at 16, while a small space or clearance 17 is provided between same and the sides of the ingot mold in order to insure that the lining can be placed in position despite slight irregularities in it`or the mold.

On account ofthe character of my mold top and the fact that the non-conducting lining can be put into the flask somewhat after the fashion of the ordinary molding in position as materials and is heldsecurely therein, my mold top may be used over and over again, and in case the inner surface of said lining becomes slightly roughened or broken in use, it can be very easily and cheaply repaired by the application of similar inaterial thereto.

I prefer to form the non-conducting liningof dainpened material which is rammed in place in inanner similar to forming a mold of this Character, after which it should be dried to expel most of the inoisture and make it hard, although to preserve the nonconducting qualities, it is preferably porous in its body portion.

The inside of my lining may be coated with graphite, soap-stone, charcoal or coaldust, in order to provide a smooth surface.

It should be noted that the upper portion of the lining extends over the fiange 9 in such a. way that when the molten metal is poured into the top, it will not contact with the metal fiask or casing.

Although I have shown and described my improvements in considerable detail, I do not wish to be limited to the exact and specific details shown and described, but may use such substitutions, modifications or equii'alents thereof, as are embraced within the scope of niy i-nvention or as pointedout in the claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 2-- 1. A mold top comprising an open flask 'tapering upwardly and provided with a plurality of inwardly extending projections, a molded non-conducting lining therein, the lower portion of said flask being provided with an outwardly projecting flange, and means for securing the top to` the mold by said fiange.

2. A mold top comprising a flask open top and bottom, provided with a plurality of inwardly extending projections and outwardly and inwardly projecting flanges on the lower edges thereof, and a molded nonconducting lining applied to its inner sides.

3. A mold top comprising a fiask open top and bottom, a non-conducting lining applied to its sides and 'projecting over its upper edges. V

4. A mold top comprising'an open top and bottom fiask, adapted to set on top of a mold, inwardly projecting flanges at thev upper and lower edges of said fiask and a non-conducting lining applied to the inner sides of said flask and extending over the upper edges thereof.

5. A mold top comprising a flask of tapering box like structure, open top and bottom, the inner surface being provided with a plurality of flanges extending therefrom, a nonconducting lining within the flask secured thereto by said flanges.

6. A mold top comprisng an open top In testimony Whereof hereto' aifix my and bottom fiask, fianges projectng insignature in the presence of two Wtnesses. wardly from the upper and lower edges GEORGE E THACKRAY.

thereof, a non-conductlfg lining applied to 5 the inner surfaces of said flask and secured Witnesses:

therein by said flanges, and means for se- CYRIL A. RIEVEL, curing the top on a mold. WILLIA H. BICE.

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