US1210774A - Ingot-mold. - Google Patents

Description

G. A. DORNIN.

INGOT MOLD.

APPLICATION HLED 24, I916.

1,210,774. Patented Jan. 2,1917.

GEORGE A. DORNIN, 0F BALTIMORE, MARYLAND.

INGOT-MOLD.

Specification of Letters Patent.

Patented J an. 2, 1917.

Application filed May 24, 1916. Serial No. 99,560.

To all whom it may concern:

Be it known that I, GEORGE A. DOaNIN, a citizen of the United States, residing 1n Baltimore, Maryland, have invented certain new and useful Improvements in Ingot- Molds, of which the following is a speclfication.

This invention relates to certain improvements in the construction of ingot molds and particularly to that class of molds in which the larger part is uppermost. Molds of this kind are generally open at both top and bottom in order that they may be teemed and may receive devices for moving the ingot upwardly in the mold during the stripping operation. In this class of molds there is great danger of the molten metal flowing or leaking from the bottom and passing sidewise from the bottom of the mold above the stool on which it is supported, thus producing what is called a fin or lateral flange on the ingot which impedes the stripping operation. In order to. prevent this refractory material has been poured into the mold and made to fill or partially fill the bottom opening thereof.

According to my present invention instead of pouring the sealing material into the mold, I provide means whereb such material may be placed on the stool 1n such a way that when the mold is lowered the sealing material is made to automatically rise and fill or partially fill the mold opening and seal it.

In carrying out my invention I provide the stool with a recess for the sealing material which is made somewhat larger in diameter than the bottom opening of the mold and is adapted to receive a flange or projection extending downwardly from the mold, the arrangement being such that when the mold is lowered said flange or projection enters the recess in the stool and causes the sealing material to rise and fill or partially fill the mold opening and to also spread and form a seal between the mold projection and the top of the stool.

Other features of my invention will be hereinafter specified.

In the accompanying drawings, Figure 1 shows a vertical central section through an ingot mold and its stool embodying my improvements. Fig. 2 is a detail view in section of the stool and the lower portion of the mold and shows how the sealin material is placed in the recess of the stoo before the mold is lowered onto the stool. This figure of the drawing also shows a cover plate for the seal. Fig. 3 is a top plan view of the stool. Fig. 4 lllustrates how a plurality of cover plates maybe cut from a strip of sheet metal. Fig. 5 is a perspective view of one ofthe cover plates.

The mold A has a cavity suitably shaped to cast a big-end-up ingot and its walls a are preferably made relatively thick in their lower portions and thinner in their upper portions as in the well known Gathmann molds for a similar purpose. The mold is open at top as usual and has a bottom opening a below a concaved or necked in portion a of the mold cavity. Surrounding the bottom opening a is a flange or projection a preferably having inclined outer walls as shown.

By reason of the necked in construction above described the molten metal while being poured will spread sidewise against the concave portions illustrated at 0. and will be directed upward and inward and thus lessen the liability of forming stickers. It is also apparent that even should the walls a be worn away during the pouring of the molten metal the formation of stickers or reentrant angles will not occur.

The stool B is provided with a recess 6 to receive sealing material C which may be of suitable loam or other refractory material. Fig. 2 shows said recess filled with material and when the mold is lowered upon said material the latter will rise into the opening a and fill or partially fill it and said material will also spread laterally around the flange a and sometimes farther outward as indicated in Fig. 1, thus producing an extended and secure seal which will prevent the molten metal from leaking from the mold cavity. It may be said, however, that the seal is such that no molten metal passes laterally from the opening a; if it did a fin would be formed which would impede the stripping operation. Fig. 1 simply shows how in practice the material as a matter of fact does spread when the mold is lowered.

I preferably use a cover plate D for the sealing material to prevent said material from coming in direct contact with the lower end of the ingot and becoming incorporated therein and producing what is known as dirty steel which is objectionable. Heretofore in tliis class of molds the bottom opening has usually been made round and a round or circular cover plate has been used for the sealing material. Where said cover plates are made in large quantities there is considerable waste or scrap when circular cover plates are cut from sheets of metal.

In order to prevent this waste I preferably form the bottom opening a angular or polygonal and by preference make it square and the coverplates are correspondingly shaped. Fig. 4 shows how a plurality of cover plates may be out without waste from a strip of sheet metal of proper width. By employing cover plates of the shape mentioned a large saving may be obtained where a very large number of cover plates are employed.

By the constructions above specified the sealing of the bottom opening of the mold is made very effective. Whatever molten metal strikes the necked in portion of the mold cavity will be directed upward and inward as before stated. The molten metal that enters the bottom opening strikes against the plate D which latter adheres to the ingot --when the ingot is stripped from the mold,

and it will be observed that there is no sealing material above the plate so that the formation of dirty steel at the inner end of the ingot is avoided. The sealing material below the plate prevents the formation of fins by leakage and by reason of the angular formation of the bottom opening'I am enabled to use plates which can be out without waste from sheet metal.

I claim as my invention:

1. An ingot mold having a bottom opening surrounded by a downwardly projecting flange and a stool having a recess for receiving sealing material of larger diameter and of greater area than said bottom opening and into which said mold flange extends.

2. An ingot moldhaving a bottom opening surrounded by a downwardly extending flange the outer walls of which are inclined and a stool having a recess of larger diameter and of greater area than the bottom opening of the mold and which recess is formed with inclined walls surrounding said mold flange and sealing material supported in said recess and extending into the bottom opening of the mold.

In testimony whereof, I have hereunto subscribed my name.

GEORGE A. DORNIN. Witnesses:

M. MEWSHAW, RALPH C. SHARRETTS.

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