US1621402A - Ingot mold - Google Patents

Description

Much 15 1927 E. GATHMANN INGOT MOLD Filed Aug. 20, 1923 2 Sheets-Sheet 1 Hill" March l5 1927.,

, 1 www E. GATHMANN l INGoT MOLD Filed Aug. 20, 1923 2 Sheets-Sheet 2 Patented Mar. 15, 1927.

UNITED STATES PATENT OFFICE.

EMIL GATHMANN, 0F BALTIMORE, MARYLAND, ASSIGNOR TQ THE GATHMANN ENGI- NEERING COMPANY, 0F BALTIMORE, MARYLAND, A CORPORATION 0F MARYLAND. p

. INGOT MOLD.

. susisuEDi .Application filed August 20, 1923. .Serial No'. 658,371.

This invention relates particularly to the casting of ingots from either steel which has been deoxidizedlas much as possible or from partially deoxidized steel and it involves certain improvements in the shape or contour of the mold chamber and of the ingot formed therein.

More especially my present invention relates tothe form of the mold chamber for casting and shaping ingots in the manner shown, describedl and claimed in my U. S. Patent No. 1,440,535 of January 2, 1923.

One 4object of the invention is to so eonv stifuct or shape the mold chamber that the ingot formed therein may have such shape that it may be Withdrawn from contact with the Walls of the cham-ber without .undue or harmful strain-ing of the outer walls of the ingot and-which is better adapted for rolling or reduction when reheated.

In my patent of January 2, 1923, l have shown a mold in which the upper part of the ingot is cast in a portion of the mold which is integral with the body of the mold and the walls of the mold. chamber are corrugated and the corners shaped in a novel way whereby the ingot metal is solidified with lessened strains, tears or cracks in the mold chamber and is of such shape as to be more efficiently rolled or reduced in cross section when suitably reheated, and -in my application for patent, filed August 20, 1923, Serial No. 658,370 I have shown certain improvements in the form of the mold cham-y ber by means of which still better results are obtained for some kinds of' casting.

According to my present invention, I provide a sink head for feeder for molds with corners or salients shaped in the manner described in said patent and said application and which is itself provided with corners and salients in such manner as to properly match within the top ofthe mold provided with like corners and salients. The feeder is preferably made of re brick or good heat insulating refractory material, and it may be formed in one piece or in sections and is of such size as to leave a clear space between its outer side wall and the inner corrugated walls of the mold chamber, which space is of such Width as to permit the .feeder to be' readily moved into and Withdrawn from the mold proper, but sufficiently narrow so that the molten metal will not pass freely through the space when the mold is poured.

The invention is clearly illustrated the accompanying drawings andv will be hereinafter more fully described.

Figure 1 is a View partly in side elevation `and partly in vertical section of a mold constructed in accordance with my invention, my improvements in this instance being applied to a big-end-up mold mounted on a suitable support or stool.

Figure 2 is a detail view in section of the upper portion of the mold proper and of the feeder.

Figure 3 and feeder. e F ifrure 4 is a perspective view of a modified forni of the feeder which is in this instance Inade in sections.

The mold shown in Figure 1 is a big-endup mold. The mold cavity is ,corrugated and is provided with corners 'and salients in is a top plan View lof the mold the manner most clearly shown lin Figure 3 and 1s hereinafter described, and its lower lportion isv necked-,inns indicated at X, the corrugations merging into the necked-in part as shown. The opening in the bottom of the mold is closed by a plug P which is of service inthe stripping of the il'igot from the mold when cast. The mold rests on a stool B of usual construction for Gathmann big-end -up molds.

A's indicated in Figure 3, the cross sectional contour of the mold is similar to that shown in my application filed August 20, 1923, Case 1. It is suflicient tov saythat themold shown has four inwardly extending primary side walls or salients which are connected to each other at the vcorners by outwardly extending side Walls or saliente,

in fact the mold A shown is similar in all respects to that shown in my application filed August 20, 1923. My present invention is not limited, however, to the precise form of corrugated mold shown, but primarily consists in a feeder or sinkhead of may be made of fire brick or similar refractory material and may be of one piece or formed in sections as indicated in Figure Ll.

In each case the cross section of the feeder is somewhat less than the cross section of the upper portion of the mold chamber into which it projects, there being a space which is preferably from 1A to 1/2 inch in width. 'lhisspace is sufficient to allow the feeder to be readily inserted and withdrawn from the mold chamber, but is sufficiently narrow so that the molten metal forming the ingot will not pass through it. The exterior walls of the feeder' are of such form that in all parts there is a clearance of the kind re ferred to. If there were a g1 eater clearance at any point, the molten metal would rise and form tins between the feeder and the mold walls and possibly run ont over the top of theI mold propel'.

In order to accomplish this result in the best Way, the exterior walls of the feeder' are made of the same forni as the walls of the mold chamber, that they have the same configuration. The feeder is provided with lugs supported on the mold. These lugs are preferably located intermediate between the upper and lower ends of the feeder and preferably they rest on wedges or blocks G which hold the feeder at the desired elevation. By using different sizes of blocks the feeder maybe adjusted to stand at dif ferent heights'. The feeder may be made in one piece as indicated in Figures l, .2 and 3 or it may be made in sections as indicated in Figure 4,y a sectional feeder having some advantages for some kinds of work. Preferably also the contour of the inner side of the feeder is of the same kind as the contour of the mold chamber.`

While the feeders shown in the drawings and hereinafter described are especially adapted for use in connection with corrugated molds of the kind shown in' my application referred to, the invention is also applicable to feeders used in connettion with ingot molds having corrugations of other forms.

It will be observed that the feeder, made in accordance with my invention, has a plurality of side walls which on the inside are bellied inwardly toward the center of the feeder and the same walls are concaved or ranged salient b.

Leaaaoa bellied on the outside in the same manner. These walls are oppositely arranged as shown. At each corner two primary side walls are connected on the outside by three outwardly curved saliente, a, L, c, there being an outwardly curved salient at the end of each primary side wall which connects by a straight wall (l or el with a centrally ar- Preferably the feeder is of the same thickness throughout except where the lugs are formed where the sides of the feeder are thickened to that extent. lt will be observed by reference to Figure 3 that the feeder is of substantially the same contour, both inside and outside, as the mold cavity. T he preferred radius for the salients at the corners is indicated in Figure 3. As shown, there is a two-inch radius for each of the three salients at each corner.

vl claim as my invention.

l. A mold top or feeder for ingot molds having a chamber provided with four primary side walls of convex contour andn four widened corners, each provided with three curved salients intervening between the adjacent primary side walls of the feeder.

2. A mold top made of refractory material having a low degree of heat absorption or conductivity, said mold top being provided with a chamber defined by four primary side walls of convex contour and with four widened corners, each provided with a plurality of outwai'rdly curved salients intervening between the adjacent primary side walls.

fl. A shrink head casing for ingot molds having a chamber provided with 'four primary side walls at least. two of which have a convex contour and four widened corners each provided with two curved salients intervening between the widened corners and the adjacent priniary side walls of the mold.

.4, i-Xshrinkliead easing for ingot molds having a chamber provided with four primary convex side walls and four 'widened corners, each }jirovided with two salients intervening between the widened corniiirs and the adjacent priminxy side walls of the mold.

ln leslixnoirv whereofl` l have .hereunto subscribed my name.

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