US1636013A - Permanent hot-top mold - Google Patents

Description

J. 5,. PERRY RERMANENT HOT TOP MOLD Filed Jan. 22. 1926 July 19, 1927.

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Patented July 19, 1927.

UNITED STATES,-

JOHN E. PERRY, OI SHARON, PENNSYLVANIA. I

PERMANENT HOT-TOP MOLD.

Application fled January 22, 1926. Serial No. 82,892.

The present invention relates to metallurgy and more especially to an ingot mold for steel ingots or the like.

Heretofore in the art, it has been recogl nized that in connection with certain types of steel, it is desirous to maintain hot the upper end of the steel pool in the ingot mold in order to provide a reservoir which will feed molten steel down into the ingot as the steel of the ingot freezes and thereby obviate the formation of pipes in the ingot. Various types of hot top arrangements for ingot molds have been proposed; principally separate tile members ada ted to set on the.

top of the mold and come into direct contact with the molten steel. These hot top tiles tend to adhere or fuse to the steel mass and must be broken away whenthe ingots are strip ed, or when the in ots are heat treated. is means that eac casting operation requires a new hot top. Furthermore, the particles of the hot top tile which adhere to the ingot tend to fuse into the steel of the ingot while the ingot is being treated in a soaking pit and this spoils the steel.

The present invention overcomes the difficulties of the known prior art by providing a hot top as a permanent part of the mold itself and with the construction so arranged that the hot top material is thoroug ly and completely protected. In the preferred embodiment of the invention, a

ot top tile or other suitable heat insulating material is set in the sand mold matrix in which the ingot mold is cast in such manner that when the in ct mold is completely cast and finished, the ot to material is entirely submerged in the meta of the walls of the mold, adjacent the mouth of the mold, and

40 is completely sealed over in such manner that the hot top material is thoroughly protected both from breakage and from contact with the steel which may be oured into the ingot mold. Preferably the ot top member is of such diameter relative to the matrix of the mold as to provide a relatively thin metal wall between the hot top material and the matrix of the ingot mold so that this metal wall may become quickly heated and will tend to retain the heat in the steel in the upper art of the ingot mold.

It is rea ized that the present invention may be carried out in constructions other than those specifically disclosed herewith and therefore, the disclosure in the specification and drawings is to be understood as illustrative and not in the limitin sense.

Fig. 1 is an elevational view s owing the section of an ingot mold in accordance with the present invention.

Fig. 2 is a plan view illustrating the position of the hot top material in an ingot mold having substantially a rectangular cross section to the matrix thereof.

Referring .now more particularly to the drawings, it is I to be understood that the shape ofthe mold is relatively unimportant so ar as the present invention is concerned and therefore, a lane straight sided wall typeof mold is il ustrated in Figs. 1 and 2.

The main body 1 of the mold" is of the usual construction preferably of cast iron, but the upper end is provided with a hot top section 2. This may be made by suspending in the matrix of the sand mold, in which the 78 v ingot mold is cast, a section of properl shaped heat insulating material 2 in sucli manner that when the ingot mold is cast, the metal in the walls thereof flows around and over the heat insulating material 4 to pro- 80 vide preferably a relatively thin wall 5 be:

tweenthe heat insulating material 4 and the matrix 6 of the ingot mold. A top face 7 seals over the top end of the mold so that the heat insulating material 4 is so embedded in the walls of the mold adjacent the mouth thereof as to be thoroughly protected and invisible when the ingot mold is completed. Any suitable heat insulation material capable of withstandingrelatively high tem eratures may be utilized as the heat insu ator 4, but preferably it comprises a suitable piece of tile such as commonly used in the art for hot top structures. Preferably, the bottom 8 of the heat insulator 4 is inclined upwardly and outwardly as a wedge shaped part in order to revent the trapping of slag, kish, or the like, beneath the heat insulator, and to permit such material to rise upwardly during the casting operation through the passage way which when filled with cast iron forms the relatively thick part of the outer wall 9, so that this material may be scraped from the top of the mold at the finish of the casting-operation. 05

While I have shown the hot top structure as an integral part of an ingot mold, it will be possible to practice my invention by providing a separate section to the mold enclosing a hot top material and constructed in such manner as to make a metal to metal joint with the main body of the mold. The integral structure, however, is preferable in thatit avoids undue length to the mold body and permits a blending of the hot zone with the cooler-walls of the mold itself. The thin wedge shaped bottom portion 9 of the heat insulating material 4 also has the advantage of producing a zone 10 of graduated heat absorbing capacity between the chilling side walls 1 of the mold and the hot top section 2 thereof, due to the fact that in this zone the thickness of the heat insulating material is gradually increased from zero to the full thickness of the heat insulating body.

Having thus described my invention, what I claim is:

1. As an article of manufacture, an ingot mold comprising a body portion having heat absorbing walls over the major length thereof, with an end portion provided with a heat insulation zone, and a graduated. heat absorbing zone between the full chill portion of the mold and the full heat insulated portion thereof.

2. As an article of manufacture, an ingot mold having a heat insulator submerged in the walls of the mold adjacent the mouth thereof, with said heat insulator being completely enclosed in the metal adjacent the mouth of the mold.

3. As an article of manufacture, an ingot mold comprising a body portion, a heat 1nsulator in the walls of the mold and with a portion of the heat insulator havinga tapered cross section.

4. As an article of manufacture, an in ot mold having a heat insulating section a ]acent the mouth of the mold and entirely surrounded by the metal, with the wall between the heat insulator and the matrix of the mold being thinner than the wall on the outside of said heat insulator.

5. As an article of manufacture, aningot mold having a body portion of cast iron and heat insulating material comprising burned tile embedded in the upper portion of the walls of the mold and entirely surrounding the mouth portion of the mold.

6. An ingot mold comprising cast iron side walls with a tile forming an inte a1 part of the interior of the side walls ad acent the mouth of the mold.

JOHN E. PERRY.

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