US2782478A

US2782478A - Sectional hot top

Info

Publication number: US2782478A
Application number: US378921A
Authority: US
Inventors: Marburg Edgar
Original assignee: United States Steel Corp
Current assignee: United States Steel Corp
Priority date: 1953-09-08
Filing date: 1953-09-08
Publication date: 1957-02-26
Anticipated expiration: 1974-02-26

Description

Feb. 26, 1957 E. MARBURG 2,782,478

SECTIONAL HOT TOP Filed Sept. 8, 1955 2 Sheets-Sheet l IN V EN TOR.

5004/? MARBURG,

His Attorney.

Feb. 26, 1957 E. MARBURG 2,782,473

SECTIONAL HOT TOP Filed Sept. 8, 1953 2 Sheets-Sheet 2 IN VEN TOR. EDGAR MARBURG,

His Attorney.

SECTIONAL HOT TOP Edgar Marburg, Pittsburgh, Pa., assignor to United States Steel Corporation, a corporation of New Jersey Application September 8, 1953, Serial No. 378,921

6 Claims. (Cl. 22-147) This invention relates to a sectional hot top for ingot molds and is an improvement to the hot top shown in my prior Patent No. 2,444,838, dated July 6, 1948. The construction of the interlocking wedge surfaces in my prior patent is such that the side slabs are not substantially rectangular, whereas it is desirable that they should be. The width of the joint faces between the slabs decreases upwardly and the lower portions of the slabs are thinner than the upper portions. Since the danger of nited States Patent leakage of the hot metal from the hot top is greater at i the top than at the bottom it is desirable to have the joint faces wider at the top rather than at the bottom. Also the slabs do not have their inner surfaces arranged vertically. Since big-end-up ingots are grasped by the sinkhead portion in stripping, or removing them from the mold, it is desirable that these sides be vertical. Vertical sides also facilitate calculation of the volume of metal in the hot top. It is likewise desirable to have the inner lower face of each of the slabs rounded in order to obtain an ingot more suitable for rolling since a square shoulder has a tendency to lap, or roll back on the ingot. However, this is not feasible with the hot top shown in my prior patent.

It is an object of my invention to provide a sectional hot top which is easily removable from the ingot and which is so shaped that the ingot can be readily stripped from the mold and the volume of metal in the hot top can be easily calculated.

Another object is to provide a hot top which is easier to make and assemble than the hot top disclosed in my above mentioned patent.

Still another object is to provide a sectional hot top the bottom of which is in intimate contact with the mold and in which leakage of hot metal through the vertical joints thereof is less than in my patented hot top.

These and other objects will be more apparent after referring to the following specification and attached drawings, in which:

Figure 1 is a top plan view of the hot top in place on amold;

Figure 2 is a sectional view taken on the line II-II of Figure 1;

Figure 3 is a sectional view taken on the line IIIIII of Figure 1;

Figure 4 is a top plan view of the side slabs in place on a mold shown in broken lines;

Figure 5 is a perspective view of a side slab showing the outer face thereof;

Figure 6 is a perspective view showing the inner face of the side slab of Figure 5;

Figure 7 is a perspective view of an end slab showing the outer face thereof;

Figure 8 is a perspective view showing the inner face of the end slab of Figure 7.

Referring more particularly to the drawings, the refer enee numeral 2 indicates the top of a corrugated ingot mold in which the hot top of my invention is installed. The hot top consists of two side slabs 4 and two end slabs 2,782,478 Patented Feb. 26, 1957 ICE 6. The lower outer surface of each of the side slabs 4 has vertical corrugations 8 thereon which match the corrugations of the mold. The outer surface of each of the side slabs has a depression 10 therein. Two rows of vertically spaced holes 12 are arranged in the outer surface of each slab 4 for receiving straight support rods 14. The inner surface 16 of each slab 4 is flat and is wider at the bottom than at the top so as to form a wedge surface 18 on each end thereof. A flange 20 extends from each end surface and has an inwardly facing wedge surface 22 thereon. Each of the slabs 4 is slightly thicker at the bottom than at the top and has a rounded inner lower edge 24.

Each of the end slabs 6 has vertical corrugations 26 on its lower outer surface which match the corrugations of the mold 2. Each of the slabs 6 has a depression 28 in its outer surface which in some instances is provided with a narrow vertical rib 30 which will contact the side of the mold and prevent the top of the slab from being pushed back and allowing leakage at the vertical joints. The outer surf-ace of each of the slabs 6 is wider at the top than at the bottom so as to form a wedge surface 32 on the ends of the slab. An inwardly facing wedge surface 34 is provided at each end of the slab 6. An inwardly extending vertical shoulder 36 is provided on the slab 6 adjacent each of the wedge surf-aces 34. Each of the slabs 6 is considerably thicker at the bottom than at the top and has a rounded inner lower edge 38.

In assembling a hot top on the mold a rod 14 is placed in one of the holes 12 at one end of each of the slabs 4 and a second rod 14 is placed in a corresponding hole 12 at the opposite end of the slabs. The holes in which the rods 14 are placed are selected in accordance with the depth it is desired to have the slab extend downwardly into the mold 2. The slabs 4 are placed in position on opposite sides of the mold and supported from the top of the mold by means of the rods 14. The ends of the slabs 6 are then placed in the space between the side slabs 4 in the mold. The wedge surfaces 18 of slabs 4 will contact the wedge surfaces 34 of slabs 6 and the wedge surfaces 22 of slabs 4 will contact wedge surfaces 32 of slabs 6 to wedge all the slabs in place in the mold with their

lower surfaces

8 and 26 contacting the mold walls. It will be noted that the width of the inner surface of each of the slabs 4 at the bottom of the slabs is equal to the corresponding inside width of the mold minus twice the thickness of the second pair of slabs 6 at the bottom of the wedge surface 32.

While slabs 4 have been termed side slabs and slabs 6 end slabs, this has no relationship to the relative widths of the slabs since the side slabs 4 may be either wider or narrower than the slabs 6. In each instance, however, the side slabs will be the slabs which are supported on the mold. While the slabs are shown having a flat inner surface and a recess on the outer surface, the recesses may be provided on the inner surfaces of the end slabs and/ or side slabs. By arranging the recesses on the inside of the sinkhead volume is increased. The shape of the sinkhead can be varied within limits by selecting the desired arrangement of the recesses in the slabs and thickness of slabs. In this manner, even in an oblong mold, a square sinkhead can be obtained, this being the most desirable shape.

While one embodiment of my invention has been shown and described it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.

I claim:

1. A sectional hot top for a mold comprising a pair of slabs of refractory material, the inner surface of each of said slabs being substantially wider at the bottom than at the top to form a wedge surface on each end of the slab, said wedge surface being substantially wider at the top than at the bottom, a flange extending from each end surface and having an inwardly facing wedge surface thereon, said last named wedge surface being of substantial width at the top thereof, means for supporting the slabs in spaced apart relationship on the mold with their lower portions contacting the inner surface of the mold and with spaces between adjacent ends of the slabs, the distance between the inwardly facing wedge surfaces of opposite slabs being greater at the top than at the bottom, a second pair of slabs of refractory material one located in each of said spaces, the outer surface of each of said second pair of slabs being substantially wider at the top than at the bottom to form a wedge surface on the ends of the slab, said last named wedge surface being of substantial width at the top thereof, said last named wedge surfaces contacting the second wedge surfaces on the first pair of slabs, and an inwardly facing wedge surface on each end of the second pair of slabs contacting the first wedge surfaces on the first pair of slabs, said last named wedge surface being substantially wider at the top than at the bottom. 3

2. A sectional hot top according to claim 1 in which each of said second pair of slabs has an inwardly extending vertical shoulder adjacent each of its inwardly facing wedge surfaces adapted to contact the inner surface of the first pair of slabs when in assembled position.

3. A sectional hot top according to claim 2 in which each of said slabs is thicker at the bottom than at the top and in which the inner lower edge of each slab is rounded.

4. A sectional hot top for a rectangular corrugated mold comprising a pair of slabs of refractory material, the inner surface of each of said slabs being substantially wider at the bottom than at the top to form a wedge surface on each end of the slab, said wedge surface being substantially wider at the top than at the bottom, a flange extending from each end surface and having an inwardly facing wedge surface thereon, said last named wedge surface being of substantial width at the top thereof, means for supporting the slabs in spaced apart relationship on opposite sides of the mold with their lower portions contacting the inner surface of the mold and with spaces between adjacent ends of the slabs, the distance between the inwardly facing wedge surfaces of opposite slabs being greater at the top than at the bottom, a second pair of slabs of refractory material one located in each of said spaces, the outer surface of each of said second pair of slabs being substantially wider at the top than at the bottom to form a wedge surface on the ends of the slab, said last named wedge surface being of substantial width at the top thereof, said last named wedge surfaces contacting the second wedge surfaces on the first pair of slabs, an inwardly facing wedge surface on each end of the second pair of slabs contacting the first wedge surfaces on the first pair of slabs, said last named wedge surface being substantially wider at the top than at the bottom, the lower outer surface of each of said slabs having vertical corrugations thereon to match the corrugations of said mold, at least one pair of said slabs having a depression in their outer surface and a narrow vertical rib in said depression.

5. A sectional hot top according to claim 4 in which each of said second pair of slabs has, an inwardly extending vertical shoulder adjacent each of its inwardly facing wedge surfaces adapted to contact the inner surface of the first pair of slabs when in assembled position.

6. A sectional hot top according to claim 5 in which each of said slabs is thicker at the bottom than at the top and in which the inner lower edge of each slab is rounded.

References Cited in the file of this patent UNITED STATES PATENTS