US1715620A - Vertical ingot mold and stool - Google Patents

Description

June 4, 1929. J. E. PERRY VERTICAL INGOT MOLD AND STOOL Original Filed Jan. 21, 1926 2 Sheets-Sheet 1 Junc 4, 1929.

J. E. PERRY VERTICAL INGOT MOLD AND STOOL 2 Sheets-Sheet 2 Original Filed Jan. 21, 1926 an'uemtoz J/Z 72 17. P677" $3 M Gum/nu Patent June 4, 12

JOHN'EDMUND PERRY, OF SHARON, PENNSYLVANIA, ASSIGNOR T VALLEY MOULD & IRON CORPORATION, OF HUBBARD, OHIO, A CORPORATION OF NEW YORK.

VERTICAL INGO'J. MOLD AND STOOL.

Original application filed January 21, 1926, Serial No. 82,635. Divided and this application filed.

September 29, 1927.

This invention relates broadly to metallurgy and more especially to mold structures particularly adapted for the production of steel ingots and the like.

The present application is a division of my prior application Serial Number 82,635, filed January 21, 1926, and relates more specially to the oint between the mold and the stool.

The objects of the invention herein dism closed will be apparentfrom an understanding of the structures, the preferred forms of which will be more specifically described in the specification following by reference to the accompanying drawings forming a part of 5 this specification.

Realizing that the present invention may be embodied in structures other than those disclosed herein, it is to be understood that the said disclosure is illustrative and not to be considered in the limiting sense.

Fig. 1 illustrates a mold provided with both stripping lugs and lifting lugs and with the stripping lugs being adapted to be used as guides to cooperate with corresponding guides on a suitable stool.

Fig. 2 is a view illustrating the side of the i noldat 90 degreesv to that illustrated in Fig. 3 is a plan view of the bottom of the mold illustrated in Figs. 1 and 2.

Fig. 4 illustrates a preferred type of stoo for use in connection with the mold illustrated in Figs. 1 and 2.

Fig. 5 illustrates a cross section through the stool shown in Fig. 4 and with a portion of the bottom of the mold, also shown in cross section, sitting on the stool.

The present invention'has to do more specially with the guiding and positioning of 40 an ingot mold upon a stool and also with a metal to metal joint between the stool and 1 I of the drawings which illustrate a preferred 90 embodiment of the present invention, the

the ingot mold. Ingot molds are very large heavy castings and are cumbersome to handle. The handling of ingot molds is in sub- 4 stantiall all cases done by overhead cranes.

The settlng of a mold on a stool is an operation which requires care in that if the mold is carelessly set injury is liable to be done Serial No. 222,698.

either to the bottom of the mold or to the stool. In either case if the injury occurs adjacent that portion of either member which forms the joint between the mold and stool there is liability of steel flowing into the crevices produced by the injury and forming a fin which may look the ingot to the mold. This probability is of greater importance in the present case in view of the fact that the joint between the stool and the mold, according to the present invention, is preferably a metal to metal joint made without the use of luting materials.

The present invention comprises two guiding means, one of which is relatively coarse or has relatively wide limits in its operation, and the other of which is of a finer character and with small limits. The mold when lowered into place cooperates first with. the preliminary guides which may comprise guiding ears on the stool which cooperate with the lugs on the mold, and then encounters the final guide which preferably comprises the frustum of a cone on one of the members which enters a corresponding recessed cup in the other member. The first guiding means brings the lower end of the mold into position to permit the final guiding means to center the mold in home position. Furthermore, in view of the fact that the mold is provided with a matrix substantially rectangular in cross section it is desirable so that the mold shall occupy the same rotative position'on the stool for each set-up. Therefore the preliminary guides, namely the ears on-the stool and the lugs on the mold, determine the rotative position of the mold so that the matrix thereof occupies the same position relative to the stool for eachsuceceding set-up.

Referring now more specially to the figures mold 10 is preferably provided on its upper end with lifting lugs 11, and on its lower end with strippin lugs 12 which have sides 14 thereof forme These su faces p efers 1y are formed by cast to comprise guiding surfaces.

the stool; and

ing, but may, where desired, be produced by chipping, grinding, or machining in order to obtain substantially accurate guiding sides. The mold herein illustrated is provided with an extension 15 on ,the bottom of the mold which terminates in a seating surface 16 and which, with. the side wall 17 thereof, preferably comprises the frustum of a cone. The mold illustrated is of the bigend-up type, but it is to be understood that the invention is equally applicable to the bigend-down type as well. This extension 15 is adapted to sit in a recess 18in the stool, which recess is provided with a substantially plane seating surface 19 and with an upwardly and outwardly inclined sidewall 20 adapted to substantially fit the side wall 17 of the frustum of a cone 15 on the mold. ,The fit between these conical surfaces is substantially loose, to always insure the seating of the surface 16 on the bottom of the mold securely against the plane seat 19 on the stool. In the construction illustrated in Figs. 4 and 5 the stool is provided with pairs of guiding cars 21 and 22 which are so constructed as to cooperate with the sides 14 on the stripping lugs as to position the mold relative to its rotative position on the stool. These cars 21 and 22 are also provided with inclined surfaces 25 adapted to cooperate with the outer side walls of the bottom of the mold to guide the mold as it is lowered by the crane into position over the stool so that the frustoconical extension on the mold will accurately enter the recess in the top of the stool as the mold is lowered to final position on the stool. In other words, the ears cooperating with the stripping lugs on the mold comprise the primary guiding members to direct the mold over the recess and the frusto-conical portion comprise the secondary or final guiding members to center the mold directly on the stool, while the primary guides also determine the rotative position between the stool and the mold. The accuracy of the fit of the surface 16 on the mold and the surface 19 on the stool, which surfaces contact to form the metal to metal joint, is of importance in the present invention. These surfaces may be made in various-ways such as machining, etc., but preferably-are produced by casting the respective parts against accurately formed metal surfaces comprisingchills. Both the mold and the stool in the present case are preferably cast from molten iron directly from the blast furnace and comprising what is known in the art as direct metal. The casting of the above-specified surfaces against chills causes the major portion of the free carbon in the top surface of the stool and the bottom surface of the mold to become spheroidal in form, and to cause the metal at the- .surfaces to be fine grained and dense. These hard, dense surfaces withstand wear and rolong the life of the respective members 0 the mold set-up. Where machined fits are used the stool is preferably cast against a forming or molding chill, while the bottom of the mold is machined to fit the stool.

Having described my invention, I claim:

1. A mold set-up for casting steel ingots comprising an ingot mold member and a stool member, one of said members being provided with a frusto-conical extension and the other of said members being provided with a recess adapted to receive said extension, and means to prevent rotation of said members relative to each other.

2. In an ingot mold set-up for casting steel ingots, a vertical mold member and a stool member therefor, preliminary guiding means to position said mold member over said stool member and final guiding means to guide said mold members to position on said stool member to form a metal to metal joint in said stool and said mold.

3. In a set-up for casting steel ingots, the combination of a vertical mold, a stool vfor closing the lower end of the matrix of the mold, said matrix being poly-sided adjacent said stool, primary guiding means to guide the mold into position over the stool, and final guiding means to accurately position the matrix portion of the mold over said stool, one

of said guiding means preventing rotation of the mold on the stool. 1

4. A mold set-up for casting steel ingots comprising a vertical mold member, a stool member upon which said mold member sits to close the lower end of the matrix thereof, one of said members being provided with a circular projection and the other of said members having a circular recess, the joint between said stool member and mold member being an unluted metal to metal joint, and means to guide the setting of said members together in a fixed predetermined rotative relation.

5. A mold set-up for casting steel ingots comprising a vertical member upon which said mold member sits to close the lower end of the matrix thereof, the matrix adjacent said stool being polysided, one of said members being provided with a circular projection andthe other of said members having a circular recess, andv means to guide the setting of said members together in a fixed predetermined rotative relation.

6. An article of manufacture comprising a stool for vertical ingot molds, said stool being provided with a circular depression of chillied cast iron constituting the seat for said mol 7. A set-up for casting steel ingots comprising a vertical ingot mold member,a stool member to close the bottom of said ingot mold member, the joint between said members comprising a circular projection on one member and a circular recess on the other member, and

mold member, a stool means-t0 guide said members mto engagement,

8. A set-up for casting steel ingots e0n1-' prising a vertical ingot mold member, a stool 5 member to close the bottom of said ingot mold member, the joint between said members comprising a circular projection on one member and a circular recess on the other member, means to guide said members into engagement, and means. to cause said members to 10 assume the same rotative position for succeeding set-ups.

JOHN EDMUND PERRY.

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