US110378A - Improvement in casting chilled rolls - Google Patents

Description

anni sont We, GEORGE G. LOBD'ELL and WILLIAM STUART, both of Viilmington, county of Newcastle, State of Delaware, have invented an Improvcmentin Casting Chilled Rolls, of which the following is a specification.

- Nature and O bjectof the Invention.

Our invention, which is too fnlly'described hereafter to need preliminary explanation, has for its object the casting of chilled rolls having soft ends, without inclu'- ring the common danger of the said ends being separated from the chilled body during the cooling and shrinking of the roll.

General Description. Any desired number of hollow cylindrical cast-iron "Grieken" LoDnLL AND WILLIAM STUART, on

f Y nELAWAn-E.

chills of appropriate thickness is fitted and securedI together, as shown in fig 1, so as to form-a tubular mold for the chilled body ofthe roll, and on the top` of this mold is a box, a, within which is formed in sand the rising gate b. j j A The lower portion of theLmold is formed in sand contained in a box, d, with which is connected the ver` i tical box D, the latter benglso packed with sand as to leave a central running-gate c, which communicates througl1,'a horizontal passage, f, with the interior of t the mold.

The chilled roll E, cast in the mold, has the ordinary tapering ends h and i. A -In casting chilled rolls, it is important that these tapering ends should be of comparatively soft metal, for, on finishing the rolls, these ends are first turned x n in a lathe, so as to be converted into the required l journals, adapted to hearings in whichthe roll revolves while ts'ehilled portion is being turned and ground.

Chilled rolls have been heretofore cast in` molds similar to that described in reference to fig. 1, and, in

- order to insure the softness of the tapering ends,

the latter are cast in contact with sand; thus, thc

lower tapering end i of .the roll iscast in that port-ion ofthe mold formed in sand 'in the box d, while the upper tapering end l1: of the rq'll is surrounded by sand m packed in the upper portion of the cylindrical chill A.

,There is however'. in this the ordinary process of casting chilled rolls, a serions defect, which may be explained as follows z` A WILMINGTON,

Letters Patent No. 110,378, dated December 20, 1870.

IMPROVEMENT IN CASTING CHILLED ROLLS:

The Schedule referred to in these Letters HPatent: and making part of the vimmo.

After the metal has been poured through the gate c into the mold until -it reaches the rising-gate b, a. snd'den cooling, and a correspondinglysudden shrinkage of that portion ofthe roll which is in contact with the chill takes placepno evilresnlt ofthis would ensue it' the tapering portion h of the roll followed the contracting chilled body ot' tllesamc; but it adheres to the sand m, while the latter adheres to the interior of the chill A; hence, in verymany instances, the tapering end is separated from the body ofthe roll at x,

and the casting is useless.

In order fo obvate this evil, we use a tapering sleeve, G, ot lthin mctalubent to the form ofthe tap-v ering cud l1, of the roll; `this we generally coat inside and ont with black-lead, clay, or other non-conducting v rcti'aetory material, the inner coating preventing the melting of the sleeve, and the outercoat-ing insuring l,the ready separation ofv the sleeve'from the body of This sleeve is fitted into the chill at the point shown in lig. 1, and in the 'space between the sleeve and the interior of thechill may be inseltcd the hollow cylinder fm, of baked sand sand when the latter is used.

or loam, which has also been suitably black-washed, alter which the mold is sui-mounted with the box a,

and the rising-gate l1 formed thcreinwith sand.

After the metal has been poured into the mold, the box a is at once removed, and whatever metal may have risen into the gate b is separated from the roll at the point y by simply knockingr ite.

Owing to the presence of the metal sleeve G, which prevents the contact of the molten metal with and its adhesion to the body of sand, thetapering end h. will accommodate itself to the shrinkage of the chilled portion of the roll, the sleeve separating from the sand and moving with the roll when the latter shrinks;

.hence the tapering end remains an integral part of the roll, and is as soft as desirable. y

In some instances theeoated sleeve may be em, ployed alone, as it will prevent the chilling ofthe metal; or the sleeve of baked sand may be employed alone, if so arranged as to slide inthe mold and to move and remain in Contact with the metal as the'roll shrinks;

in eithercnse the object of my invention is accomplished; that is, lthe mold which receives the metal forming' the softend of the cylinder is carried with the ,latter when it shrinks,'so as to prevent the fracture of the` roll.

To facilitate the descent of the tapering end of the roll as the chilled body shrinks, we sometimes apply pressure to the end of the newly-east roll immediately after the removal of the box al yandthe knocking ed the metal on the risingvgate Y lThis pressure may be appliediu a variety'of ways, for inst-ance, a plunger, W, kande' weighted-lever, M,

@titte may be applied, in the manner too clearly illustrated in iig. 4 to need euplanation.

The sleeve will be united or partially united to the metal of the roll, but can be readily removed by ti-.ir-

ing or chipping it olf, or removing it in the lathe when the journal is turned.

Claims. 1. The employment, in casting chilled rolls, of :t sleeve, or its equivalent, receiving the metalwhieh forms the soft, end of the roll, and moving with the latter when the meta-1 contracts, substantially as de- Scribe-(l.

2. 'lhe application, to the top of the newly-enst roll,

'nl' pressure, as set forth.

ln testimony whereof we have signed our names to this speeiliczitioniu the presence of two subscribing witnesses.

GEORGE G. LOBDELL. Witnesses: XVILLIAM STUART.v

JARRE'TT MEGA-w, JAMES H. CAMERON.

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