US2572452A - Sectional tapered bottom ring for hot tops - Google Patents

Description

Oct. 23, 1951 Rl E. DALEY SECTIONAL TPERED BOTTOM RING FOR HOT TOPS Filed Feb. 23, 1949 Illmlll pill INVENToR. fase/er 'fMEy BY Patented Oct. 23, 1951 UNITED yySTATE-'s'.

snCni-ONAALk '.EAPERED Bo'iToM RING matorrales Robert E; Daley1 Wil-loughbyyOh-io; assignor tor- 1- The.:y Ferro, Engineering Company, Cleveland;

as is well understoodin the art, are intended for single use only. The advantagesof bevel shoulders on an ingot inv respect to the molding of the ingot are known and appreciated in the art. A- single piece ring with a tapered. innersurface. could not be molded economically, but by constructingfthe ringin-a numberof sections equal I to the number Voffsides ofi the hottop, four in a rectangular hot top and-six in a hexagonal one, I am enabled to ern-ploythe `inclined side of; each ring section as the strike-oiafaceinV the molding operation, the. other surfaces. ofz thering section: including the end sur-facesbeing soldesignedas-to` be readily moldable. 5

Heretofore refractory bottom rings have been. formed with aflat undersurface, asfor example in Charman etal; Patent 1,949,292, or Urmetz Patent 2,046,043) which. served as the. strike-oli.y face in themolding of. the ring. Theupper side. of the ring necessarily-includes an. upwardly. prof.. jecting rim to covertheinner. edgeof. the casing ledge and tosubstantially meet the lower. inner edges ofV the upper lining blocks. of such a ring therefore cannot. constitute. the, strike-off face. The lower side. cannot be. used; as the strike-01T face because theanglebei'vveen; it and the inclined face would be greater than 90. Hence the production of a bottom ring with such an upwardly projecting rim Vand with an innery taperdsurfa hasheretefore been .miressible of accomplishment.

In accordance with the present invention -this diiculty has been overcome by molding the ring in sections equal to the number of faces of the hot top and. using the inclined face of each section asthe strike-01T face.

One of the objects of the invention therefore is the construction nl?v a. hot top bottom ring in sections hav-ing. inclinedY surfaces .designed toV be utilized for forming bevel shoulders on the ingot, the said sections being molded with their inclined surfaces ush with the strike-01T surfaces of a mold used for producing them.

Other objects and features of novelty will appear as I proceed with the description of that embodiment of the invention which, for the purposes of the present application, I have illustrated' in the accompanying drawing, in which Theupper side.

3.r Claims. (Cl. 22--147r)7 Figlis a. Vertical eectivrialview @fe rectenew lar 9m1ithzt-t0i embodying the invenfnvrig,- 2 is. a' 'i916 'DIari'YeWQf the' asslflbled: bottom ringl with wiper strips in place thereon; j fig- 3 is'abottbmflan View 0f th'same @lira larger Seele? an@ 'Withdutihe 'Wiper StibS'" Fiefl 'is a, 'i013 191e?. Yiw' 'f 011e' vSection o f the ring.

Fig. 5is'a side Viewv ofthe'sarne. y Figs@ and 7 are elevationalviews looking at thetwogends respectively o Fi'g. 5, and

Fig.. '8t is `a` fr.algmentali lefrspective `view of ad# jaeent engislof two ring s tiene; indicating now' the ringis assembled;

refrst @meter lesh its'bwerfdt i pro'vded with' an 'inwardlyextnding leele' 1I; onY which there" aref supported refractory lblocks I 2 Aconstituting "th'elowe'r course of la 'seifilperniai neet irlulatea linme- 1*@ "lfestilgr` blocks 5.2i @maleta the 'Semi-Permanent lining for the casing. Blocks"- I? overhang 'theledg' somewhatas *illustrated in Fig. The 'forel going elements oithe'cnstruction are convenbienal in the art*- 'In the present instancethe inner surf-ace I4fof the ledge'is inclinedinwardlly and upwardly' tl take an'Y inclinedsurf'ace I @on Aeachv lsection off-thv bottom ring. Thebottoml Asurface Ii'of the casing may be substantially perp` e'ndicularl to theouter Wall* thlgf- It iS y@tugfffd" by @flat Svllfa-,Dl of .eech's'eo of the b QttOri riiig'l" Thirn'ei'. surface otfe'ach section'oftlie ring isfa single planar `surface Igwh'ic'h mayl be parallel-tothe surfe?? 'I5-"ensi`if11'1i` yti' 13S" adapted terr.'- duce a bevel shoulder upon the" castinlc,r at the junction ofy the ingot' proper and the sinkhedg Saememwmeep' cmmrtlynrlwedfon composite liotl topsjinay be usedi'in this' con'strlc tion and may be' interposed; between vtl'iesiir'facer IG atl the bottom, 5f-{thie- Qasing 'andthe surface I-'IA on each section. Thes'estrips, which pro-r jecA-'outwardly 'be'yoiidV t'lefca'sing-`v for Contact' Wahine-regie Warfare mrkedfllajlin the dra; ing,f They aresi'i'itably"sl'o'tteizl-V a"s indicated :titte` clear wire`- Zjl that are-provided attheir ypper endsr w1 h hooksZffor-jengageinet' with-recesses' 2:3; in'k ythefbsriri'gII] and?""aI''"tl'iirlower ends with further hooks 24 which embrace the lower edges of the ring sections so as to hold the latter in position during the handling of the completed hot top and the pouring of the molten metal therethrough.

The bottom ring extends inwardly beyond the ledge Il substantially as far as the overhanging portions of the lining blocks I2, any clearance tha/"meileur @velar/Wh different form and are so designed that they in tert with the ends of adjacent sections and are v moldable. Y

At one end the lower and thicker half of the ring section projects endwiser-beyond the upper half as indicated at 30. This end portion may have a curved exterior 3| to conform with the corner radius generally provided on the inner sur,- face of an ingot mold. At the upper and thinner half of the ring the end surface 32 is parallel to,v the inner surface I8 of thel adjacent ring section,

by which it is overlapped.

At the opposite end of the section the lower orothicker half has an undersurface 33 which is inclined in a plane parallel to the inner surface I8 ofthe next adjacent section, by which it is overlapped. At this end of the section the upper or thinner half is provided with an end surface 34 which is disposed at 45 to the surfaces l5 of both sections. It is designed to t within a corner surface of the ledge I I.

In order to provide the necessary draft for molding the ring section a portion of the end at the bottom of the inclined wall 34 is cut away ras indicated at 35, and in order to ll the cavity thus left when the ring is assembled the other end of the ring is provided with a corresponding projection 36. When the ring sections are assembled upon a casing small pockets 31 are left at the corners, but these are filled with slurry and thus exclude hot metal.

The individual sections lof Vthe rings are molded of suitable refractory material without metal reinforcement and are dried or baked. When completed they are strong and rigid. In the molding of a ring section the flat surface I8 is made the strike-off face. The other surfacesare so designed and arranged as to meet surface I8 at angles less than 90 in order to provide the necessary draft for molding purposes.

Y, When a hot top embodying the linvention is prepared for a casting operation the casing I with the lining blocks I2 and I3 assembled therein is inverted. The bottom ring sections are then mounted on the casing, slurry being run into the joints to ll any cracks or crevices resulting from slightly imperfect fits. The four wiper strips are then slid into position between the bottom surface of the casing and the surfaces II of the ring sections. All of the latter are then secured to the casing by means of the wire clips 2 I.

In the manner stated I have accomplished the object of providing a hot top bottom ring with tapered inner surfaces for producing inclined shoulders on a cast ingot, while overcoming the difficulty heretofore existing of molding such a ring by simple molding procedures. In other words by molding each side of the ring separately and using its inclined surface as the strike-on 4 face I am able to provide such a ring at low cost. Also by providing the double overlap at each corner, as heretofore described, relative movement between the sections, when they are supported by the clips 2 I, is negligible.

One of the advantages of the invention arises from the making of the ring of four refractory parts instead of one which permits smaller molding equipment, simpler mechanized handling,

smaller storage facilities and less bulk in shipment. I Another advantage is that the separate sections of my ring when left behind on the ingot by the stripping of the hot top therefrom, break away from the ingot in the first one or two rolling passes, whereas a one-piece ring of conventional form provided with metallic, reinforcements adheres to the ingot longer.

Having thus described my invention, I claim:

1. A sectional bottom`ring for composite hot tops having inclined' inner walls for imparting bevel shoulders to ingots at the junction of the ingot proper with the sinkhead, comprising a plurality of ring sections equal to the number of hot top faces, means for attaching each section individually to the casing of the hot top, each of said sections having a flat face for forming the said bevel shoulder on one side of the castingr and its other surfaces forming angles with said at face not greater than whereby the separate sections of the ring are readily moldable, each section at a corner of the hot top having a portion overlapping the adjacent section and another portion overlapped by the adjacent section.

2. A sectional bottom ring for hot tops as defined in claim 1, wherein the overlapping surfaces in each case are continuations of the said fiat faces of the respective sections.r

3.V A bottom ring for composite hot tops having inclined inner walls for imparting bevel shoulders to ingots at the junction of the ingot proper with the sinkhead, comprising a series of sections adapted to be individually 'attached to the casing of the hot top,'each of said sections having a fiat face Yfor forming the said bevel shoulder on one side of the ingot and having a, face REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,501,655 Gathmann July 15, 1924 1,921,729 Charman Aug. 8, 1933 1,921,730 Charman Aug. 8, 1933 2,391,715 Kloss Dec. 25, 1945 2,444,838 Marburg July 6, 1948

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