US1242827A - Process of casting rolls and the like. - Google Patents

Description

F I u 1 WITNESSES H. A. LOMAX.

PROCESS OF CASTING ROLLS AND THE UKE.

Patented 00 's 9, 1917.

3 SHEETSSHEET 1,

APPLICATION HLED AUG-21.1915.

H. A. LOMAX.

PROCESS OF CASTiNG ROLLS AND THE LIKE.

I APPLICATION FILED IEUGZM I915- L fi Patenmd 001191917.

FIE-E- WITNESSES H. A. LOMAXJ PROCESS OF CASTING ROLLS AND THE LIKE.

APPLICATION FILED 'MIG.2I. I916.

1,24Q,2?. Patented 0%. 9,1917.

To all whom it may concern.

HAROLD A. LOMAX, or AsPINvVALL, PENNSYLVANIA.

rzaocnss or oAs'rINe nous AND THELIKE.

Be it known that I, HAROLD A. LQMAX, a

citizen of the United States, residing at Aspinwall, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Processes of Casting Rolls and the like, of which v the followingis a specification.

. My invention consists in an improved method or process of casting rolls for rolling mills andother similar articles. i

In rolls of the type used in reducing metal in rolling mills they are ordinarily provided with a main roll body, journal necks, and terminal wabbler connecting portions cast in one piece, and requiring considerable finishing treatment to form the wabbler terminals.

In their usual form these terminals are pro vided with a plurality of laterally extending Wings and intervening recesses for engagement with the connecting wabblers, and are ordinarily machlned down from cylindrical -blank casting entailing considerable expense. A common cause of failure in rolls plus is also due to imperfections in the metal, due to shrinkage and other causes incidental to making the entire roll in one cast.

My invention has in view to, provide means for casting a roll in such a manner as to cast the wabbler terminals and, if desired, portions of the journal necks, by supplying additional hot metal during or supplemental to the a main casting operation, whereby to supplement the main body, and

compensate for shrinkage andto castjthe wabbler terminal with a sinkhead' extension, within suitable casting mechanism, 'inthe manner more fully hereinafter described.

In the drawings which illustrate differ- .ent forms of mechanism for molding the journal and wabbler portion of one end of the roll, in vertical casting thereof,-- Figure I shows portions of a sand molding flask, together with acastblank and the neck and wabbler forming mold and metal supply, means. 1 v c Fig. 2 is a plan view of Fig. 1,. showing the mold before casting. v

Figs. 3 and 4, and 5 and 6 respectively ,are corresponding views illustrating modifiediconstru'ctions adapted to .carry out the invention. The roll A,which is usually cast vertically within the sand mold 2 of flask 3 of Specification of Letters Patent.

-- Patented Oct. 9, 1917.

Application filed August 21,1916. Serial No. 115,998.

any suitable construction, is usually formed from upwardly flowing metal supplied by a lowercon'duit A: leading to a supply e2 rises carries impurities and surplus metal to the top, a large proportion of such surplus metal being ordinarily utilized at the upper end of the mold to provide against shrinkage, piping, and other well-known lcontingencies.

The journal portions of the roll 5,5, are molded within the sand mold of the flask,

as in ordinary casting operations, as is also thelower wabbler terminal 6. The upper wabbler'terminal 6 is, however, cast con-' siderably longer than the required length, with the wabbler-engaging wings continuous to the top, as in Fig. 1, whereby to provide at its upper portion additional metal as required by absorption into the main body of the roll, its upper neck and upper Wabbler, as the roll'g'radually cools andshrink- .age takes place.

which should ordinarily be thrown sufliciently high to be cutoff as waste.

; My invention consists in supplementing the main body of metal, after the main cast is made, with additional fresh metal from above, and in introducing such fresh metal into the upper wabbler and neck portion,

whereby. to renew the same,with sufl'icient surplus to carry all impure metal, and upper waste or surpluskportions to the top, and whereby to supply and maintain the supplemental. renewing metal at a considerably higher temperature than that of the already cast roll, therebymaintaining its fluidity sufliciently long to insure the formation of an absolutely solid homogeneous neck and 'terior of the mold. The molten metal as it wabbler section and the maintenance of a higher degree of heat at such portions of the wabbler at the endof the cast.

I also accomplish the formation of the upper wabbler by such terminal molding operation in practically finished form, so that it is molded into shape corresponding approximately to that of the lower wabbler,

the wabbler extensionsurplus being later removed, asis also the surplus sinkhead portion or portions.

For the purpose of thus forming the upper portion of the roll, I provide a supplemental molding core 7, preferably in two parts, extending across the upper central portion of the main molding body 2, and

The supplemental metal is poured into these molding cavities from above, either into the central wabbler cavity or the outer cavities, after the main roll has been cast. up

to, say, the level I), b, corresponding'approximately to ,the desired lengthof the wabbler, or higher. The additional hot I, metal flows into andjamalgamates with the already cast portion ofthe wabbler and neck, carrying with it upwardly any impurities, to the'top portion and providing the upper supplemental reservoir supply and eventual waste portions as to both-the sinkhead and wa bbler elements above, say, the line b, b, as to the wabbler, to anyv necessary extent. r V

In Figs. 3 and 4: the arrangement of the mold'portions, outer. sinkhea'ds, and wabbler extension sinkhead is substantially the same as already described,except that the pattern for forming the sinkhead cavity should be so constructed as to provide at about the terminal or slightly beyond the end of the wabbler section 6 rounded or concaved terminals of the spaces, between the wabbler wings, ,as indicated at 6", whereby to pro-' vide a cylindrical extension 6? within the core 7 for easeof flow and ample supply of feed metal, and particularly to avoid cracks or fissures in shrinking, by the prevention of any sharp or rectangular angles.

' The arrangement of the sinkhead,mold cavities of the other parts are as already described. V l

In Figs. 5 and, 6, the general arrangement of the ,roll casting mold is substantially as already described and identified'by similar numerals, except that the outer sinkhead extensions 9 areeXtended upwardly beyond the main roll body A of the'same, or slightly less diame'ter, continuously around, forming a neck section considerably larger than necessary, and adapted to be turned off to pro- ,vide'the upper neck, as indicated by the dotted'line [5. The sand core 7 is formed and located in substantially the same way, and the operation as already described carried out, the surplus metal being turned away in final treatment of the roll for use. It will be understood that various means or modified adaptations of the invention as to the particular mechanism for molding the parts,controlling the degree of addition of surplus metal, the percentage of waste, or

variousother featuressor details incident to carrying out the invention may be variously changed or modified by the molder or foundry practice employed without departure from the scope of the invention.

The advantages of forming a practically finished'wabbler extension and the resulting reduction inthe cost and. time for cutting away the surplus metal and the several other advantages of the invention will be understood and appreciated by those familiar with the art. I

Having describedv my claim is: 1

1. In the manufacture of rolls oftheclass described, the formation of a main roll body, neck portions and one wabbler portion by invention, what I 'fiowing molten metal upwardly within a portion and connectingwith the upper neck portion, substantially as and for the purposes described. i I i 3. In casting. metal bodies, the process of flowing molten metal upwardly within 'a suitable mold to form .a main body, and the addition offsupplemental metal from, above within a mold while the main body is still molten forming upper terminal and supply members, the supplemental supply members connecting with the main body ,a substantial distance below the upper terminal, substantially as described. r a u, 4.. In the manufactureof rolls of theclass described, the formation of a main body, neck "portions and the lower wabbler portion by flowing molten metal upwardly within a suitablemain surrounding mold, and adding'molten metal, of" a higher temperature, from above within a supplemental mold to form the upper wabbler portion. andjsinkhead portions spaced from said upper wabbler portion'and connecting with said neck portion at the base of the wabbler portion, substantially for the purpose. described.

5. In the manufacture of rollsof the class described, the formation of a 'main bo'dy, neck portions and one wabbler portion-by flowing molten metal upwardly Within a In testimony whereof I hereunto afix my suitable surrounding mold, and adding signature in the presence of two Witnesses. molten metal of a higher temperature, from above Within a supplemental mold to form HAROLD A. LOMAX.

the other wabbler at the upper end and sink- Witnesses:

head portions at the si es of said upper W. A. HEOKMAN, wabbler. C. M. CLARKE.

flopiee of this patent may be obtained for five cents each. by addressing the Commissioner of Patents,

Washington, I). 0.

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