US2065969A - Combined metal mold for casting and stripping ingots - Google Patents

Description

Dec. 29, 1936. s; H. GRIFFITHS COMBINED METAL MOLD FOR CASTING AND' STRIPPING INGOTS Filed July 18 1936 Patented Dec. 29, 1936 ooiunmnn METAL MOLD ron. CASTING AND s'rmrmo. moors Septimus n. Grimm,- Canton, Ohio Application July 18, 1936, Serial No. 91,421

, 5 Claims. (01. 22-139 This invention relates to an improved and novel sectional mold for casting ingots from molten steel or other desirable molten metals, said mold being so designed as to constitute an ingot casting and self-stripping mold for producing large end up ingots and is composed of two sections,

a major upper section and, a lower minor sec-' tion, with means for causing the upper section to be automatically and truly centered upon the upper face of the lower section at the point of juncture of the two sections.

The prime object of the invention is to provide a. simple, novel, economical, practical and thoroughly efficient self-stripping mold that serves to prevent the formation of piping or blow-holes and to produce a solid ingot forming a homogeneous composition throughout.

Another object of the invention is to so form and construct a two section mold that the inner wall thereof will be inclined gradually from its top to its bottom in true alinement and of such dimensions as to produce an ingot having a smooth exterior surface, and that'will effectually prevent the formation of a fin or fissure around its'outer surface. 1

Another object of the invention panying drawing, and particularly pointed out in the claims appended hereto, it being understood that slight changes in the precise shape, proportions and minor details of the construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming apart of this specification it will be seen that:

' section of the mold, showing it partly in section,

is to so construct the two sections of the mold that the I lower section will be fixedly secured to anysuitable or desirable support to prevent its movement away from said support when it is desired to lift the upper section carrying the ingot away from said lower section, and to permit the self centering of the two sections of the mold when placing the sections together in readiness for th molding operation.

Further objects of the invention are to so construct my improved sectional mold that it will dispensewith the use of plugs of all kinds and types that have been heretofore employed for closing the open bottoms of the mold and for lifting the ingot from the mold; to dispense with inverted stripping of the mold; to eliminate the employment of costly plungers and other equipment heretofore employed for forcing the ingot out of its mold, and to' form a mold that is selfstrinping, thereby saving time, labor, fuel and ex- Y by the combination, arrangement, location and pause, and to materially increase the number of ingots produced within a certain period of time and at the same time improve the quality of the ingot product. g

The foregoing and such other objects as may appear from the ensuing description are attained construction of the several parts hereinafter and showing in full lines the projected end of the ingot when seated upon its support.

Figure 3 is a view partly in section and partly in elevation, showing the ingot stripped from the inner wall of the large upper section with the upper end of the ingot projected above the upper end of said section with the lower end of the section seated on its support, and

Figure 4 is a detail vertical section taken in the plane of the dotted lines 4- -4, Fig. 1, showing a portion of the upper section broken away with its lower end portion seated on the lower section and the means for locking the lower section to'its support with the support broken away.

In 'the embodiment of my invention as illustrated it will be seen that the numeral 2 indicates the larger upper section'of the mold formed with integral outwardly extended lugs or ears 3 at its upper end portion to which suitable lifting means are removably attached for lifting and moving the said section away from contact with the lower smaller section 4' of the mold, and the lower endof said larger section 2 is provided with a plurality of integral outwardly, downwardly and oppositely disposed laterally extended formations 5, ,each of the formations having its upper face beveled downwardlyand outwardly at ,6, then extended downwardly? and terminating with a horiinwardly beveled 'or inclined and terminating with more fully described, illustrated in the-accorna vertically disposed shouldered portion 9 terminating with the horizontally extended meeting face. In forming the point of juncture with the upper face of the lower section, as shown in Figs. 2 and 4' of the drawing, while the lower section 4' is provided at its upper end with simi 'lar butupwardly extended and oppositely disposed integral formations ll reversely beveled or inclined, as shown in Fig. 1, so that when it is desired to join the sections together it is simply necessary to lower the upper section 2 until the lowermost beveled inner faces 8 of each of its downward extensions overlap and engage withface of the beveled upward extensions ll formed at the upper end of-said section 4' to overlap and engage with the lowermost outer end portion of the section 2, and said section 2 by a further lowering thereof will be automatically guided to and properly and accurately centered upon the meeting face of the lower section by contact with the vertically disposed shouldered portions forming a part of each of the laterally disposed extensions or formations 5 and II, thus causing the meeting faces of the sections which are preferably so machined as to form a true, accurate and tight juncture of the said meeting faces.

Both of the mold sections are preferably formed of cast iron and .when united at the point of juncture the inner wall is inclined gradually inwardly from the top to the bottom thereof, terminating with a concaved solid bottom, said formation being provided for the production of large end up ingots; for eliminating and dispensing with the use of alltypes of plugs and ingot lifters heretofore employed in connection with molds for casting ingots.

By the construction of my improved form of large end up mold the molten metal assures progressive solidification from the bottom to the top of the ingot; serves to prevent the formation of piping and. blow holes, which is a prime factor to soundness and homogeneity; the production of a higher grade and quality of'ingot possessing a smooth exterior surface and interior, and adds to the value and quality of the rolled product produced from the ingot. e

It will also be readily perceived that 'by thisspecially designed type of mold there is no fastening means employed to lock the sections together', hence neither time nor labor is required for unlocking or releasing such fastening means, since the larger section or member is simply lowered and is automatically guided by the aforesaid beveled extensions until the meeting faces truly and smoothly contact with and are held truly in their properly alinedposition by the vertically disposed shouldered portions at the point of juncture. By this particular construction of mold the two sections are intended to have special proportions or inside capacities with' relation to each other, that is, the lower section has a standard capacity for the reception of onefifth only of the entire inner capacity of the mold for the reception of the molten metal, since it has been successfully demonstrated that such standard capacity of the smaller lower section of the mold prevents the possibility of a fin or fissure forming around the'ingot at the point of juncture of the two sections, for the reason that when pouring fluid steel at a temperature of 2850 to 2900" F. into a comparatively cold metal mold, which is usually about 400 F. in good practice,

from an elevation of about seven feet, the aver-V,

age mold being seventy-two"inches'ih height, when the hotmetal strikes'the bottom portion of the mold or inside face thereof a skim, scum 1 or film is immediately formed, owing to contact of a scum or film that rises above the point of juncture of the sections, seals the juncture portion of the mold, and thereby eliminates the formation of a. tin or fissure -of any type whatever around the outer surface of the ingot.

It will be seen that the lower minor section of the mold is seated upon a suitable support It, and is provided on each opposite side thereof at its lower end portion with an integral projected lug or ear I! for the reception of an elongated metal link I4, said link being adapted to be swung over a fixed lateral extension l6 having an upward and inwardly beveled or inclined surface I6 for the reception of the lower portion of I being charged with molten metal, and for the mold stripping operation.

When it is desired to strip the ingot from the.

mold the upper larger sectioncarrying the entire ingot is lifted from the lower section with the solid convexed lower end of the ingot pro-- jected below the lowermost face of said larger and seated upon a suitable support with the projected, lower concaved face of the ingot seated upon the upper face of the support, so that when the ingot is seated upon its support it will cause the automatic gravitation of the large heavy uppersection until its projected lowermost faces 1 are caused to assume the position shown in Fig. 3 of the drawing, saidautom'atic actionsimultaneously causing the ingot to be forced and stripped away from the inner wall of .the mold and cause the upper end of the ingot to be projected above the upper end of the mold section,

when the usual means employed for the purpose,

in' ingot foundries is used to grip said upper projected portion of the ingot and convey it away to the soaking pit, heating furnace or other desirable destination, thereby facilitating and simplifying the rapid stripping of ingots by the use of sectional molds of the type hereinbefore referred to. I

It will be understood that this construction of mold is-adapted for use in connection with all kinds of molten metal for casting ingots or slabs. especially with relation'to what is commonly known in the art as rimming oreifervescing steel. Further, it will 'be seen that the extensions 6 formed on the lower end portion of the major section 2 serves as a rest therefor, and also serve to prevent contact of its meeting face with any foreign matter that may accumulate on theof juncture with the minor section of the mold.

Having thus described my invention, what I claim and desire to secure by Letters Patent'is:

1. A metal mold for casting self-stripping ingots, comprising an upper major section having an integral oppositely disposed beveled and shouldered downward extension projected below its meeting face at two sides thereof, a minor lower section provided with an integral oppositely disposed reversely beveled and shouldered extensection and is moved to another .positiori over 2,065,969 sion at two sides thereof projecting above its meeting face between the extensions of the major section, with the said shouldered portions of the major section overlapping and in contact with the outer wall of the upper end of the minor section, while the shouldered portions of the minor section contact with and overlap the lower outer wall of the major section, all of said extensions coacting simultaneously and jointly serving to automatically guide, center and maintain the meeting face of thesections into true alinement between the shouldered portions of said extensions at the point of juncture and to form a tight joint at the said point.

2. A metal mold for casting self-stripping. ingots, comprising a major upper section provided with an integral downwardly disposed extension at opposite sides thereof projected below the meeting face of the section and formed with an inwardly and upwardly beveled face, a lower minor section having an integral lateral extension at its opposite sides projected above its meeting face with the inner face of the extensions beveled inwardly and downwardly, a support for the mold disposed below said sections, means for fixedly securing the minor section to the mold support, consisting of two integral and oppositely projected formations near the bottom of said minor section for the reception of one end portion of an elongated metal link, and a laterally extended fixed member at each side of the mold support, so that the said link may be easily swung over the said fixed members, thereby fixedly securing the minor section to the support.

3. A metal mold for casting self-stripping ingots of the character described, comprising two sections horizontally separated, a mold support disposed below said sections, an upper major section formed so as to carry the entire ingot when lifted away from the other section, a minor lower section for forming a lower convexed end to the ingot, means secured to the minor section I and the mold support for fixedly securing said ing the entire ingot with the lower convexed end of the ingot projecting below the lowermost end of said major section, and seating said convexed end of the ingot upon the support, thereby owing to the structural formation of the innerwall of the major mold section with relation to the outer wall of the ingot causing the major sectiononly to gravitate and be seated upon the support simultaneously forcing and stripp the ingot from the inner wall and project the upper end of the ingot above the top of the major section.

4. A mtal'mold for casting self-stripping ingots of the character described, comprising two,

sections horizontally separated, a mold support for said sections, an upper major section having a plurality of downwardly extended portions at its lower end and formed so as to carry the entire ingot when lifted away'from the other section, a minor lower section for forming a solid convexed lower end .ingot, means secured to the minor section and to the mold support for fixedly securing said minor section to the support, the minor section having only one-fifth of the inner capacity of the entire mold, outwardly extended lugs formed at the upper portion of the major section for lifting it away from the minor section and seating the convexed lowermost end of the ingot upon the support, whereby the structural formation of the inner wall of the major mold section with relation to the outer wall of the ingot causes the said major section only to gravitateand be seated upon the support simultaneously forcing and stripping the ingot from said inner wall and project'the upper end of the ingot above the upper end of the major section.

'most end to the ingot, a support for the mold disposed below both sections, means secured to,

the lower section and to said support" for fixi edly securing said lower section to the support, outwardly extended lugs formed at the top portion of the major section for lifting it away from the lower section, said major section being formed so as to carry the entire ingot away from the lower section with its lower end portion projecting below the bottom of the major section, and seating the lowermost concaved 'end portion of the ingot on the support, which owing to the structural formation of the inner wall of the major section with relation to the outer wall of the ingot will cause the majo ection only to gravitate until seated upon th e koggort and simultaneously strip and force the in t away from said inner wall of the said section and project the upper end of the ingot above the top of the major section,

SEPTIMUS H. GRIFFITHS.

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