US1670594A - Ingot-mold core box - Google Patents

Description

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2 Sheets-Sheet 1 ATTORNEY y May 22, 192s. 1,670,594 J. E. PERRY n INGOT MOLD GORE BOX original Filed May 14, 1924 2 sheets-sheet v' 2 INVENTOR fa/zizi?` Derry BY l I .r ATroRNEY and apparatus for casting Patented May 22, 1928. p

UNITED STATES PATENT OFFICE.

JOHN EDMUND PERRY, OF SHARON, PENNSYLVANIA, ASSIGNOR TO VALLEY `MOULD & IRON CORPORATION, OF SHARPSVILLE, PENNSYLVANIA, A CORPORATION Ol' NEW YORK.

INGOT-MOLD CORE BOX.

Griginal application led Hay 14, 1924, Serial No. 713,128. Divided and. this application illed November 27, 1925.

The present invention relates broadly to metallurgy and more particularly to the art ingot molds.

In my copendigng application, which even- 6 tuated in' Patent. No. 1,620,128, patented March 8, 1927, I have disclosed a mold set up for casting ingot molds, in which :set up the core is accurately and securely held in a central position with respect to the mold 10 flask by means lof interiitting parts, thus eliminating errors of judgment in making the set up and also eliminating` the possi bility of accidental displacement of the core with respect to the mold flask. The present application is a' division of said prior application and thelinvention herein claimed is the core bar and box organization, the core bar, and the method of making the core disclosed in said parent. application. The inventionclaimed in this application is particularly useful in producing the core used in the set up of the parent appl1cat1on,but in its broader aspects, the invention may be utilized in other relationships. r v

The invention greatly simplies the procedure of the prior art by providing a core bar havin parts adapted to inte'rt with parts of t e mold and by providing a core box with parts interitting with the core bar, so thereby eliminating the element of chance or skill both in sand rammingthe core bar and in setting up the core bar for casting. The present invention enables the various operations -to be carried on with certainty and 85 with much less skilled labor.' l

In carrying out the invention, the core bar is provided with a relatively large base which is fxedly and rigidl secured to the core bar standard. Preferab this base is suiiicient- 40 ly larger than the core bar to extend be- 'neath the matrix4 inthe mold set-up with which it is to be used and also to extend out under the bottom portion of the fiask. The peripheral edge of the base is `preferably providedvwith an upstandlng rim -Wl 11ch is adapted to contact with a heavy stripping plate or bottom ofthe flask wlth which the core is used. Thus when the core 1s placed in a mold set up the flaskmay set partl on the casting bottom and partly over the ase of the core bar. The core bar base may set Ain an opening in the casting bottom that 1s exactly centeredv relative to the casting bottom.

Serial No. 71,609.

When the core bar is ready for ramming a layer of sand is arranged over a dishshaped portion of the core bar base. This base of the core bar exactly its into a ramming base on the core bar box. The sides of the core bar box are cast iron doors or sides which are hinged to the ramming base like a pair of gates and close over the base of the core' bar to rest upon the up-standing edge of this base, thereby accurately positioning and locking the core bar vertically in the ramming box to securely maintain the` parts in this position during the ramming operation. The edges of the sides of the box smooth down the sand which was rammed in "the dish-shaped portion of the core bar base. Mold sand is now rammed around the sides of the core barcolumn, which may be when desired, of any well known collapsible type or it may be non-collapsible.

After the' ramming operation is completed the core bar box is opened and the core is lifted by a crane and set asideto dry, after lirst being blackened. It will b'e observed that the large heavy base on the core bar provides a complete support, for the bottom portion of the vsand packed around the core bar. Afterlthe core is dried, it is picked up by a crane and set into a suitable opening provided with machined sides in the casting bottom which correctly positions it with respect to the other parts of the mold which may also be set on the bottom.

`In this manner, the operations proceed in regular order without any removal of the parts after the have been set up, as was the old practice; urthermore, the parts are securely locked together so that it is possible .to utilize a set-up embodying the present core bar forcasting on moving platforms or bug ies or carriages which may be very'desirale, but which could not be performed by a set-up under the old'practice.

' Having generally4 described the invention, it may be stated that an obJect 1s to provide an improved core bar which may be mterlocked with the parts of a suitable mold in such manner as to maintain accuracy of setup without sacrifice in economy of time or' labor to secure the desired result.

Another object ofthe invention is to rovide a core box hinged to a ramming ase whereby said core bar may be seated in a predetermined position thereon and the sides of said box may be readily swung aboutthe core bar to complete the set-up for ramming. f' A further object of the invention is to pro'- vide a core bar rigidly mounted upon a supporting base, which isof sufiicient size to permit its outer periphery to extend beyond the sand mold on the core bar and to be engaged by the flask in a suitable mold setup, whereby the core bar is held rigidly l1n a predetermined vertical position.

Other and further objects of the present inventionI will in part be obvious and will in part be pointed out hereinafter by reference to .the accompanying drawings, throughout which like parts are designated by like characters. i

It is recognized that the present invention may be embodied in constructions and practiced by steps other than those herewith specifically disclosed; therefore, it is desired that the disclosure herewith shall be considered as illustrative and not in the limiting sense.

Fig. 1 is a vertical cross sectional view of a collapsible core bar before being rammed;

Fig. 2 is a plan view of the base of a core bar ramming box;

Fig. 3 is a cross section through the core bar in position in the ramming box;

Fig. 4 is a cross section of theramming box taken adjacent the base thereof;

Fig. 5 is a cross section through a set-up ready for casting having the improved core bar therein, and

Fig. 6 is a detail view of a portion of the base of a core bar where the base comprises a chill flange for chilling the bottom of an ingot mold castin'the set-up.

Referring now more especially to the drawings, which illustrate a preferred embodiment of one form of device for carrying out the present invention, the core bar 4comprises a'pedestal 2, which may carry the movable collapsible sides 4, as is common in the art. .The pedestal 2 is fixedly mounted upon a heavy base 5, which may be formed on its upper surface as a dish-shaped member having a depressed portion 6 and a rim portion 7. Projections 8 may extend `up Wardly from the bottom'of the depressed portion in order to provide supporting members for sand which may be filled in over the dished ortion. The base 5 is provided with short ugs or legs 9 on which the bar may stand when not in use.` The sides of the bottom of the 'core bar have machined ribs 10 thereon which are downwardly and inwardly inclined.

The base 11 of the core bar ramming box is provided with a depression 12 which also has machined ribs '14 which have machined surfaces inclined exactly to correspond to the inclination of the surface on the machined ribs 10 on the base 5 of the core bar.

Preferably sand openings 15 are provided thereto, blacked in the bottom between the ribs 14 to permit any sand which works between the ramming base and the core base to filter through and get out of the way. The upper face of the ramming base is provided with curved inachined tracks 16 that form supports for the bottom flanges 31 of the trough-like core box sections 17 and 18 which form the side walls of the core box. These sections are hinged together by long hinge arms 19 pivoted at 13 so that after the core bar,base 5 is set in the depression 12 iii base 11 of the core box, thereby accurately positioning the core bar in the box, these cast core box sections 17 and 18 may be swung closed to surround the core box. The pivot 13 of thev long arms 19 is located at a corner of the core box preferably on a diagonal of the core box matrix. The arrangement of the long arms 19 and the pivot 13 isl Such that when the core box is opened o-r closed the sides have a transverse bodily movement somewhat like the blades of a shear. This is important when the core box is opened as it causes the sides to move bodily away from the sand face on the core bar and obviates injury to this delicate sand face. Be-

fore the sections are closed however, sand is rammed over the dish-sliaped portion of the core bar base so as to form a rammed sand surface extending outwardly from the base of the pedestal of the core bar. After the sections of Athecore boxv are closed and locked together by C-clamps 32 or; other locking means, the sand is rammed around.

the core bar as illustrated in Fig. 3.'

While the features of the above described core bar are applicable to mold set-ups genorally, their advantages are more readily attained'with a flask and supporting base, such as shown in my copendiiig application, which eventuated in Patent No. 1,620,128, issued March 8, 1927, referred to hereinbef fore. A cross sectional view of the pre ferred set-up is shown in Fig. 5, wherein the core bar `after having mold sand applied l and dried, is set in a depression 21 1n a casting bottom 22, which depression lis likewise provided with I machined supporting surfaces or ribs 24. These surfaces contact with 'the similar surfaces 10 on the core bar base and accurately position the core bar relative to the casting bottom. A flask 25 is then set down over the core bar-and on to the casting bottom. lWhen this happens a stripping plate 26 on the bot` the workmen may run dry orting surfaces 10 and 24 and the core bar ase 5. Preferably C-clamps` 27 are used set-up may be placedif desired. It will be sizes of flasks.

noted that the base 5 of the core bar is sufli' ciently large to extend outwardly to support the sand mold on the core bar and in addition -to extend under the sand mold on the flask 25 to permit its outer rim to be engaged by the flask or the stripping plate thereon, whereby the flask serves as a positive means for holding the core bar in a predetermined position on the casting bottom.

This construction present-s such accurate and rigid fittings that there is little danger of any fins being formed ou the bottom of the cast mold, but it will be observed that immediately back of the bottom edge of the matrix the seam or joint is Aformed between the cold metal rim 7 011 the core base 5 and the cold metal stripping plate 26 on the bottom of the flask, and consequently is a cold metal to metal joint. Therefore, if any of the hot iron should tend to leak into this joint, it is immediately chilled as soon as it strikes a cold metal to metal contact and will not proceed beyond this point.

Theremay be conditions where it is desired to utilize a chill at-the bottonrof-the mold, and where this isY desired, the base 5 of the core bar, is not cut away to form` a dish shaped member, but is left full and solid as is indicated at 29 in Fig. 6.

From the foregoing, it will be observed that the 4parts are so constructed and intertitted as to automatically center and interlock the core bar in the core box, thereby obviating the necessity for hand settingand also obviating inaccuracies which are necessarily attendant with hand set-ups. By means of the present construction standardized core bar bases and casting'bases may bev utilized with different sized ingot mold flasks so that a relatively few number of casting bottoms may be used Withseveral different This is of importance because the casting bottoms can be laid out on the casting floor or set upon cars or iconveyors without requiring frequent changing. The other parts comprising the flask and core barsare lifted to and from these bases during the set-up and stripping operations and the bases are changed only when widely different molds are to be cast, thereby economizing in time and crane movement.'

Having 'thus described my invention, what I claim is:

1. A device of the class described comprising a core bar ramming boxand a base therefor adapted to seat va core bar, and

ying said core bar -cnt of said hinge means for mounting the parts of said ramming box on said base, and guides on said ramming box and said ramming box base adapted to position same about a core bar.

2. As an article of manufacture, .a core bar ramming box and a base therefor, means Afor pivoting the 'parts of said ramming box to said base therefor to permit said parts to swing about said pivot to close and open said box about a corebar, and means independent of said pivot to support said parts.

3. In a device of the class described, the combination of a core bax` having a base rigidly attached thereto, a core bar ramming box comprising a pair of trough like members hinged together at one side thereof, a rannning base for said box having a seat adapted to receive the base of said core bar, means for pivotally connecting said members to said ramming base, and means on said base and said members for guiding said members over said core base and determining the position of saidramming box with respect to said core bar, said members engagin said position.

4. In a core casting ingot molds, the combination of a pedestal and a supporting base rigidly secured thereto, said base being adapted to receive a layer of mold sand about said pedestal, and having a rim extending aroundV the outer periphery thereof to' prevent metallic fins on the mold cast thereabout.

5. As an articlefof manufacture, a core box comprising a base, side wall sections mounted over said'base, long hinge members connecting said side wall sections to said base to cause a bodily outward movement to said side wall sections when said core box is opened, and supporting means independto support the weight of the side wall sections.

6. As an article of manufacture, a core box comprising a base, side Awall sections mounted to slid(` upon said base, and a hinge adapted to guide the movement of said side wall `sections, said hinge being located substantially upon a diagonal of the matrix of said core box.

7. As an article of manufacture, a core box comprising a base, side wall sections mounted upon said base, and tracks carried by said base to support said side wall sections during opening and closing movements.

8. As an article of manufacture, a core box comprising a base, side wall sections slidable upon said base and with the weight of said side wall sectionsbeing supported by said bine, and means lo cause said side wall sections to move bodily away from a core within said core box when the, box is opened.

9. As an article of manufacture, a core base to hold said core bar y.

bar adapted to be used in l lll) bar ramming box comprising movable side Walls having substantially vertical matrix faces, and means adjacent the bottom edges of said side -Walls provided with substantially horizontal matrix faces.

10. The combination of a core box ramming base adapted to receive. 'a core bar base,v a core bar having a vertically extending portion and a base adapted to fit Within said core box rainming base. and 'core box side members having horizontal faces extending over said core bar base and vertical faces extending upwardly from said horizontal faces.

1l. The combination of a core box ramming base adapted to receive a core bar base, a core bar having a vertically extending portion anda base adapted to lit within said rcore box ramming base. a rim around the edge of the core bar base, and core boxv sidemembers having horizontal faces extending over said core bar base and vertical faces extending upwardly from said horizontal faces, said horizontal faces .being adapted to contact with the top ofthe rim on the core bar base.

12. A core bar ramming box comprising a base 'member adapted to support a core bar, and heavy vertical sides mounted on said base member and adapted to extend over sand on a portion of a core bar base.

13. A core bar ramming box comprising a base member having a recess with inclined faces thereonadaptedto support a core bar, and heavy vertical sides mounted on said base and having a horizontal portion adapted to extend over a -portion of said recess to engage the core bar base and accurately center the core bar in the core box.

JOHN EDMUND PERRY.

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