US3680827A

US3680827A - Rings of heat insulating material for use with floating head boxes in ingot casting

Info

Publication number: US3680827A
Application number: US8326A
Authority: US
Inventors: Paul Gilger Rausch
Original assignee: Foseco Trading AG
Current assignee: Foseco Trading AG
Priority date: 1969-02-04
Filing date: 1970-02-03
Publication date: 1972-08-01
Anticipated expiration: 1989-08-01
Also published as: CA917876A; GB1257865A

Abstract

Insulating rings for use with floating head boxes in ingot casting are reinforced by a partial outer casing of sheet metal.

Description

United States Patent Rauscin [4 1 Aug. 1., 1972 [54] RINGS OF HEAT INSULATING [56] References Cited MATERIAL FOR USE WITH FLOATING UNITED STATES PATENTS HEAD BOXES IN INGOT CASTING 1,696,986 1/1929 Trembour ..249/200 [72] Inventor: Paul Gilger Rausch, Cleveland, 2,263,437 11/1941 'Cameron ..249/198 Ohio 2,274,580 2/1942 Bailey ..249/106X 3,012,296 12/1961 Wiesner ..249/106 [73] if? Tradmg 4 3,437,308 4/1969 Thiem et a1 ..249/201 [22] Filed: Feb. 3 1970 FOREIGN PATENTS OR APPLICATIONS 1,376,779 9/1964 France ..249/202 [21] 83% 881,365 11/1961 Great Britain ..249/202 150,953 8/1955 Sweden ..249/106 [30] Fol-fig Apphcamn Pnomy Dam Primary Examiner--R. Spencer Annear Feb. 8, 1969 Great Britain ..5,840/69 ArwmeyW9lfe, Hubbard, y g i & ann,

Ltd. 52] 11.5. CI ..249/202, 249/106 57 ABSTRACT 521;} Int. Cl. ..B22d 7/10 Insulating rings for use with floating head boxes in Field of Search ..249/ 197-202, 106; e 164/53, 124,411,412

' ingot casting are reinforced by a partial outer casing of sheet metal.

3 Claims, 3 Drawing Figures RINGS OF HEAT INSULATING MATERIAL FOR USE WITH FLOATING HEAD BOXES IN INGOT CASTING I This invention relates to the production of metal ingots and more particularly to the construction of an ingot mould assembly.

It is well known to provide an ingot mould with a hot top, generally in the form of a heat insulating lining within the head of the mould or, alternatively, as a head box lined with slabs of heat insulating material. The purpose is to provide in the vicinity of the head metal a hindrance to the loss of heat from the head metal, thereby to delay its solidification and so maintain a feed of molten metal to the body of the ingot to compensate for the shrinkage which occurs on cooling and solidification. In this way the tendency to the fonnation of fissures, cracks or the like in the cast ingot can be minimized.

A head box may be regarded as an upward extension of the ingot mould to which it is applied. Any opentopped ingot mould may be provided with a superimposed head box which may either rest or be fixed upon the top of the mould wall. However, in the case of a big end up ingot mould (i.e., one which tapers outwardly towards the top), a floating head box is often used. Such a head box is one which is inserted into the upper mouth of the mould and which, when the mould is filled with molten metal, tends to float on the surface of the cast ingot. A floating head box generally consists of a metal casting, open at the top and bottom, lined with suitable hot-topping material and provided at the bottom with a refractory ring which protects the metal casting from direct contact with molten metal in the ingot mould. The refractory ring is usually of the general shape of the ingot mould section and is made of a refractory and/or heat insulating composition. A similar ring is used with fixed head boxes.

In recent years there has come into use for such purposes (and for many other purposes in the production of ingots and castings) a heat-insulating composition which comprises a particulate refractory material, organic fiber, and a binding agent. Such compositions may consist for example of sand, paper pulp and a thermosetting resin binding agent. The compositions may contain inorganic refractory fiber, e.g., asbestos or slag wool, instead of, or in addition to, the organic fiber.

Examples of such suitable compositions are described in British patent specifications Nos. 888,857, 921,332, 960,474, 976,617, 977,191, 1,117,977.

While slabs formed of such compositions are of adequate physical strength for most of the purposes for which they are required, the use of such materials for rings as aforesaid, though afiording the required heatinsulating properties, are often rather easily broken, because of their large overall dimensions compared with their small cross section. It is an object of the present invention to provide means for overcoming this difficulty.

The invention is further illustrated in the'accompanying drawings, wherein:

FIG. 1 is a schematic perspective view of a ring assembly embodying the invention, except only one part of the metal casing being shown for the sake of simp c y;

FIG. 2 is an enlarged, cross-sectional view taken essentially along lines 2-2 of FIG. 1, except showing both parts of the metal casing and illustrating the spatial relationship between the metal casing and the bottom flange of the heat insulating ring of the present invention, and

FIG. 3 is a schematic perspective view of a ring assembly similar to FIG. 1, except showing the embodiment wherein the ring is formed of two superimposed sections.

According to the present invention there is provided a ring of a heat-insulating composition comprising particulate refractory material, organic fiber and binding agent, there being provided at the outer periphery of the said ring a metal casing consisting of two ring shaped-plates having flanges thereon, the plates making contact with the upper and lower faces of the ring of heat-insulating composition and the flanges thereto extending over the said outer periphery to a distance greater than half the thickness of the ring.

The flanged metal rings may conveniently be fixed in position by nails or the like passing through the overlapping flanges and into the material of the heat-insulating ring.

In a modification of the invention a plurality of heatinsulating ring sections may be superimposed and the flanged metal rings used to hold the assembly together, the flanges in that case extending to a distance greater than half the total thickness of the peripheral parts of the assembled heat-insulating rings.

It is found that not only does the metal casing thus provided assist in preventing fracture of the heat-insulating rings but it also has the advantage that by presenting a metal surface to the molten metal it tends to chill the molten metal in its immediate vicinity, and thus check the tendency for molten metal to leak through the joint between the mould wall and the heatinsulating ring into the gap between the mould wall and the head box.

The accompanying drawings illustrate a heat-insulating ring with protective casing, according to the present invention. In FIG. 1 there is shown a heat-insulating ring 1 having associated with it a metal ring 2 which has a downwardly projecting flange 3. Only one ring 2 is shown, forthe sake of simplicity. In FIG. 2 there is shown a section through the periphery of the heat-insulating ring 1 showing the location of metal ring 2 with flange 3 and metal ring 4 with flange 5. The flanges are secured to the ring 1 by nails 6.

In FIG. 3 an embodiment is shown wherein the heatinsulating ring 1 is formed of two superimposed ring sections 7 and 8 which are held together by the metal casing.

I claim as my invention:

1. A- ring of heat-insulating composition consisting essentially of refractory material, organic fiber and binding agent, said ring terminating in an outwardly depending, bottom flange having atop and bottom plane which are substantially parallel to each other and an outer face connecting the top and bottom planes and a metal casing consisting of a first annular plate positioned against the top plane with a downwardly projecting flange covering part of the outer face and a second annular plate positioned against the bottom plane with an upwardly projecting flange covering part of the outer face and positioned in an abutting relationship with the flange of the first annular plate, the flanges of the annular plates being dimensioned to overlap so as to completely encase the outer face of said bottom flange.

2. A ring according to claim 1 wherein the flanged annular plates are fixed in position by nails passing through the overlapping portion of the flanges and into the material of the heat-insulating ring.

3. A ring assembly comprising a plurality of superimposed heat insulating ring sections made of a heat-insulating composition consisting essentially of particulate refractory material, organic fiber and binding agent, the assembled ring sections terminating in an outwardly depending bottom flange having a top and bottom plane which are substantially parallel to each other and an outer face connecting the top and bottom planes and a metal casing consisting of a first annular plate positioned against the top plane with a downwardly projecting flange covering part of the outer face and a second annular plate positioned against the bottom plane with an upwardly projecting flange covering part of the outer face and positioned in an abutting relationship with the flange of the first annular plate, the flanges of the annular plates being dimensioned to overlap so as to completely encase the outer face of said bottom flange.

Claims

1. A ring of heat-insulating composition consisting essentially of refractory material, organic fiber and binding agent, said ring terminating in an outwardly depending, bottom flange having a top and bottom plane which are substantially parallel to each other and an outer face connecting the top and bottom planes and a metal casing consisting of a first annular plate positioned against the top plane with a downwardly projecting flange covering part of the outer face and a second annular plate positioned against the bottom plane with an upwardly projecting flange covering part of the outer face and positioned in an abutting relationship with the flange of the first annular plate, the flanges of the annular plates being dimensioned to overlap so as to completely encase the outer face of said bottom flange.