US865055A - Process of rolling sheet metal. - Google Patents

Description

Y PATENTED SEPT. 3, NO?.

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NORTN. PROCESS 0F RLLING SHEET METAL.

L :LED asm. r', 190e.

ArPLroATIoN P sheetbars or tin-bars.

UNITED STATES EDWIN NoIiToN, or NEW YORK, N.

` PROCESS OF ROLLING SHEET METAL.

vSpecification of Letters Patent.

Patented sept. s, 1907.

Applicants sied september 17, Igea. serial No. 335,030.

To all whom it may concern:

Be it known that I, EDWIN NORTON, a citizen of the United States, residing at New York, in the county and State of New York, have invented or discoved new and useful Improvements in Processes of Rolling Sheet Metal, of whichl the following is a specification.

My invention relates'to the art oi rolling sheet-metal, and more particularly to the art of. rolling sheet-metal to such thin sheets as are made into tinplate, sheetiron, galvanized iron, etc.

Heretofore in rolling iron or steel into thin gages for the uses above named, it has been customary, first, to roll the billet, slab, or ingot of steel, into what is termed In modern mills, these bars are rolled in continuous mills vdirectly from the heated ingot into long narrow bars approximately eight `inches wide, from onefourth to one-half of an inch thick, and from thirty to sixty feet long. After being thus rolled, these bars are delivered to a cooling table while they are still at a comparatively high or an oxidiiing heat, and after being allowed to cool, are sheared into the desired lengths and supplied to the sheet and tin mills as ltheir raw material. These shearod tin or plate bars are, in the usual practice, reduced to the de.- sired thinness for tin-plate etc. in the following manner: They are first placed in heating furnaces and when hot, are taken thereromi'by workmen with tongs and given several passes between the rolls' ol a tin-plate inill the bars being fed into the .mill with their length parallel to the rolls oi the mill. ihe bars are thus elongated until too cool for further rolling. They are next returned to a second furnace and 'reheated and again rolled, this time in two layers, one sheet being laid on another. Ait'er.

this step, they are doubled in the center into iour thicknesses and the irregular ends caused by the rolling are sheared off. The doubled pack is then placed in the furnace and when properly heated, is drawn out by the rolls. The pack is again doubled, and its ends shearedoff. This doubled pack, now having eight thickness is put into the furnace, `reheated Iand iin-ally rolled into the desired gage. It is then shear-ed at the ends, cut in the required lengths, opened, and put through the sut-- ceeding operations oi annealing, pickling, cold rolling,

and tinning or coating with the desired metal. From:

the foregoing, it will. be seen that the labor and lui-.l required in these numerous lieatings and rollings are i1nportant and costly iteins, while the loss from the numerous shearings amounts to' about twelve per cent. oi the weight of the bars.`

In my improved process which I will now describe, all these items o cost are greatly reduced and the iinished surface of the sheets produced thereby is greatly improved, as will be more fully hereinafter explained.

The drawing accompanying this specification and forming lapart thereof represents diagrammatically a plan oa mill for the practice of my improved process.A

The drawings are not intended to show the machinery Complete, but only theiact that machinery oi diiierent general characters is present. The drawing contains but a single view and is to be read as if thel sections were arranged in tandem with the lines AB coincident.

ln practicing iiiy process, l heat the billet, ingot or slabin the furnace l, which is preferably of thewellknown htinuous type. Whenvsuiiiciently heated for.

rolling it is caused to pass to the conveying table V2, whose rollers are run by the motor 3 continuously in a direction to convey the billet, ingot or slab to the roller table 4,'whose rollers are 'caused to rotate alternately in opposite digections by the motor 5.0i any selected re- 1 versible type.

6 represents a universal reversing mill in line with the conveyor table 2, and 7, a second conveyor table, in

line with the conveying table 4 but on the-opposite oi the iiiill therefrom. The rollers oi the table 6 lare driven in opposite directions bythe motor 8.

9 represents a conveyer table inline with the table 7,

having inconnection,therewith any desired number of shears l() by which the ends oi the sheet may be cut ofi and the saine divided into the desirednumber oi sections.

].'l,is a pusher by which the sheared sheets aretransierred to the conveyer l2, which may be ol any type, and which places the packs of sheets, assembled on the table 9. in line with the rolls 13 of a continuous mill. This mill has its rolls running at successively greater spel-.ds i'roni lei'tto right on the drawing. The inechanisiii loi' accomplishing this is well-known and need not be described.' The packs oi sheets delivered from the rolls 13 pass to the table 14, from which they maybe pushed la! orally upon one of the conveyor tables l5.

Returning how 'to the billet, ingot, or slab which l traced to the conveyor table 4, itis passed in a wellknown iiiiinnor buck and forth several times through the rexf'ijrsing mill (5, or il; is, in any other manner,'re-.

dur-ed to a long plate varying in thickness iroin onelenth lo ,one-tourt li oi' an inch and havingany desired width` After being cross-slivarod bythe shears' l0 into platos from eight to sixteen i'oetr'loiig, these plates-are iiiiitclicd or piled, one Vupon another', by any suitable ineclniiiisiii or by hand in piles ol' Your to eight thicknessi-s, as desired, and after being reheated, if desired, they are transita-rod to the continuons train oi reducing rolls.

The pack, as it passi-s through the rolls lli, is kept constasitly stretched between passes, because the rolls speeded so as to run at successivi-ly higher speeds in the esl direction ol' their leed, thespeeds being set to secure the desired stretching action. 'llie result of the stretching is that, when tho sheets have been reduced to thin gages, they will leave the niill free from buckles and they will bo prevented from adhesiolnone to another, whereby the opening of the pack is facilitated. After 'shearcd inte lhorter length.

'fspacc between the-several stands el rolls .shall he about ncveri'ieet l'mm conter lh ventenne that the meta-l, alter the lirst pasa-'shall he hclll lirinly in the hito el' murc than ciw Sland'ol' rolls. By so doing I ani enabled not only to roll the metal, b ut als() te stretch the same hctwecn passes. It thus hecomcs practicable tu rell at n single heating and at one 'pasgage llnungh llutrain all ordinary gages ei sheet steel in lcngths nl' approximal el y une hundred and sixty feet. Y The economy nl' my process over that in use at present is most apparent, as th(l pack rolling lis thus completed bollire the shearing takes place.' Vln'placc 0i shearing after each rolling, as rcqnircdundcr present methods,` the ends only require to he shearcd. ll', how/'ever7 the conditions are such that a reheating becomes ilesimhlc, thc plates 01' packs 0l' them may be relic-ated. v v

While I prel'cr to roll the vfinished packs iii four to eight thicknesses, it is ebvious that any ilesircd numlhcl" oisuperpesed plates er sheets can be rolled andv stretched that can be conveniently placed pnc above )assed the mint where oxidation can occur as the f leave thel last mill 0i the continuous train at a: black hint. For this reason the surfaces el' thel finished sheets are more smooth and tak@ a higher polish in cold rolling than (le plates er sheets rolled hy the ordinary pmi-css from regular lin or sheet bars which have. heen vallmved tu exidize alter being rolled.

lclaimfl ln a pre nf forming sheebinelal, rolling a pack el' pile uf slice. imultaneously at a phrallty oi places and concurrently therewith stretching the metal between conseem ive rell passes, whereby the several sheels compusing the pack ur pile are prevented from adhering one te

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