US1006600A

US1006600A - Rolled metal article.

Info

Publication number: US1006600A
Application number: US2192070?A
Authority: US
Inventors: Frank N Speller
Original assignee: National Tube Co
Current assignee: National Tube Co
Publication date: 1911-10-24
Anticipated expiration: 1928-10-24

Description

UNITED STA'LES PATENT OFFICE.

FnaNx'N. SPELLEB, or moxnasrom, PENNSYLVANIA., salomon To NATIONAL TUBE rrrrsnuaau. PENNSYLVANIA, 4 coaronarIoN or NEW amar.

aoLLnn u METAL ARTICLE Be it known that I, linANx N. SrnLLEn, of McKeesport, Allegheny county, APennsyl- Vania, have invented anew' and useful Rolled Metal Article,of which the following isa full, clear, and exact description, reference being had to the accompanying drawings, formlng part of this specllication, in which-- Figure 1 is a lan view showing the surface of a metal blbom or blank after the first pass where a three-hi mill is used; Fig. 2 is a 4cross-section on t e line II-II oflg. 1 Figs. 3, 4, 5,'and 6 are cross-sections similar to Fig. 2 showing the metal in the next four successive passes; Fig. 7 is a crosssectio'n of a skelp. showing the character of the plate formed by my process; and Fig. 8 isl an enlargedview showing the wedge action of the preferred form of projections.

Myinvention relates to vthe rolling of steel, and is particularly useful in the manu ufacture of steel plates used in the man l ture of welded pipes. It is a well knwn fact that welded pipes will eorrode andfbe come pitted under .unfavorable conditions.

The object of my invention is to reduce this'. liability to corrosion and pitting, and to improve the surface ortion of the steel plate, and the pipe, w ere my process is used in such manufacture.

Thei'nventi on is broadly 'applicable to the i rolling of blanks, plates, shapes, or any `finished steell products; although it isof 'I ecial advantage in pipe manufacture..

essi have discovered that by breaking up one or both surfaces of the steel blank or the product ofthe mil is improved in quality,

article during the rolling by wed e shaped projections on` the roll or rol s acting thi-ou hout the surface to be treated, and the'n attening, 'the outer portion so treated belng densified and -rendered less subject to corrosion. I attrib-v quality to the wedging action 4of the roll pro'ections, and. to the rolling in or retaining o 'a greater portion Vof the scale or oxidV thanv formerly;A but whatever the exact action may be, the result is that the -outer or surface portion is improved, bein infact made practically homogeneous, an

l is rendered more .uniform in character. x In carrying out my invention in the manspecmomon' or Leners Patent. .ippuuon many ze, 199e. sms: mi. snaar.

plate may be one or both Patented Oct. 24, 1911.

facture of steel plates for making welded pipe, the rolls by which the slab or billet is reduced, are not formed with substantiallv smooth faces as heretofore, lbut of them is provided with a sereaof angled Wedges which form wedge shaped indentations as indicated at 2, 2, in the blank 3, shown in Fig. 1. The indentations are sulciently close so that they break up and reworle substantially the entire face of the late or substantialiy the entire portion to Ee treated; but as shown a small edge portion 3 is preferably lleft at the opposite edges of the rolls, to prevent spelling of the rol or rolls.

In case the... late is to betreated'on both sides, the weges .may be applied simultaneously or successively; that 1s, the plate may be passed between a pair of rolls, each of which is so shaped, or it 'may' be assed through rolls, only one of which 1s sos aped, and then throu h another pass, of which the other vroll so s apes the other face of the plate, If the successive method is used, the

assed through a two-high mill, one of wlibse rolls is so shaped, and the` plate may then be another two-high mill in which the 'other face of the plate is so treatedyor the plate may be passed through the top and bottom passes successively o a three-high Inillin which the middle roll isprovided with the wedges. Afterthus treating one or both faces of the late, the platey may then be rolled out int e ordinary manner to Hatten it, andV the operation isv repeated two or more times untii the metal surface becomes plain or nearly so. I prefer, however, after the first wedgc .action to further break up passed through the surface by changing the sha e or otherwise altering the projections or roken surface. For this purpose, I preferably use further rolls in which depressions are formed in the apices of the ived ridges. Imay thus increase the number oindentations and reduce otherwise change the sha e, size or number of thefindentations whic y formed. If this second indenting or breaking up is'femployed it also may be appliedto may be indented at'a time.

their original size, or I may were previously faces and one or both surfaceL In. the drawings, where I heve shown' the nmnufacture ofv skelp according to m mventi on, starting for example, with a b oom 3Q inches inthiclmess, this would be passed between the middle and lower rollof athreehigh millhavin the middle roll provided with the-projectlons or indentations. This would result 1n Ithe blank 3 of Fig. 2, which for example is reduced to inches in thicko ness. In thisinstance I have used de res A sions about l inch deep, with angles of e, out

90 degrees between 4their" opposite sides.'

The indentations are preferably blunted so 1 es to present no sharp corners. Thus the bottoms of the valle s or indentations are preferably about o an inch wide, the tops of,l the! projections being about the same In thenext pass the metal is fed between j", .the middle and, up er rolls of the' three-A f ,hi h mill and may e reduced to about 1i -inies' thickness as lshown et 4 in Fig. 3.

`In this vpass the depressions in 'the fupper face are nearly removed while depressions 5 corresponding to those of the vupper ,face ere foi-ined vin ,the lower foce,`

Inthe third pass of Fig.4,tbe metal piece 5 maybe reduced to 11' inches in thickness,

. the indentations formed in` the' second pass on the lower vfece bein 'removed or Vsubstantially lremoved, whl e indentationjs rmaller'than those first formed are made in .the u per fece.l In this case the depressions llve'hout i inch dee ,and the angle between 5 th posits sides o the'depressions is about 'i 30 egress, the corners bein blunted as be- 4 f In the next or fourt pass through this second three-high mhh-the metal piece 6. i shown'in Fig. 5, maybereduced to the form 40 oili ,.6, the upper depressions ofthe third ing' removed while A' responding de.

pressions ereformed in-` th ower face. In" the fth pass 'of Fi {tliemetalpiece- -in'eybe .reduced to o an 'inchthick, and

; frolnnthis point the skel muy be rolled in fthe ordinary manner wit plain faced rolls.

The blank is rolled as o.'A le blank tllr'uhoutthe. .rolling 10 i 011s es dis :wished what@ V*known as pack Y' indicated ty thlfenisrgea showing `me Figz'' the lprojet'ztons 9 on' 'the roll- 10 ore f shape, opggr'ovidedfwithsmclined rnd-"sides 11. l hess inclined f ubstan pmlleliac'es of the proections bring upon thernet in the direcmdieaitedthe l'arrows in. Fig.' 8. u the work fdcned on the tony o. l n'jetrable amount, 'makin the' iihiyfoi'ln ndjdnse. The orieninponentey of' the forces actupon` f [tel canht between the' projections, "und-'th metsl squeezed into the s ece betweenthem"usv the 'full draft ofrt e rolls v615 is brought tobear. Thfesewedge-shape pro` jections of af subtantial depth comperedto the thickness of the blank, are importentin obtenin my imprdwed result.' I, referebly `indent t e rolles deeglfas possi le within certain practic limi Their depth will of course' be limited by structurel considerations' es tac-weakness of the roll.` and also by abilit to remove't e marks by smooth `rolls in tie after-treat nt.V

The treatment to which the metal blank is subjected modifies the outer or surface portion, so that when 'the original blank is of soft or open structure, if the edgewf the furnished late be etched, it will show a. well define and substantiel outer loyer or layers a of denser and more resistant substance than the inner or 'body portion b. This I illustrate in Fig. 7;.

In rolling -plates for skelp, the indent` ing motion must be stop ed at such a. thick ness, lthhtv the plete wil have an even or Vchmercifilly `finished surface. My plates, Wever, muy 4he made ,slightly rougher "In the ordinary rolled lates.

The breakin up of e surface or' surfaces by we ging en then smoothing ghanges the structure' of the outer ortion of the metal and improves it. Ins abs or plates of ordinary thickness, I ma use indentations on4 both sides,,ea,ehir`i exitation V92s being' approximatel -eig'hth or morey of thickness of the b ank, so' that .the com. bined depths of. theinldentetions on 'both sides are practically 25`pe`rcent. or more of the thickness ofthe blank. n

t. hendvantages 'of `m invention ap reciated by those ski 'ed in tliejert. Not 'on' y d o the plates or' articles betterjresist corrosion, but their outer portionfis lso' made-of hi her quality for Alneny other 10E purposes. t -the same time 'the cost of rollmv is increasedvery-little, iffnny, since no ed itionel passes are ordinarily required, and the only added' cost is that of sha the roll or 4rolle hevingthe surface w i formsthe indentetidns. l

The invention is applicable-'toen rolled steel articles.V It n mybeepplied-'i reils, shapes, plates, carnwhe'els, -ba'rs "or 'roll .products ofnll kinds-which are either-Y rolled in to finished l products or *are efteiwerd i F worked up into 4rli's.hed prbdcte. The. treated pcu'tionlnntgy4 e :used 'on' one orlinre fsurfeces of 'the article, and menyj changes may b e made in the Vformancl arrangement: 'V of .the a paratus -`and method, without 61 parting romniy invention. L I if,

"1. `e new erticleoemnnufactutef Y body of' motely having` en' exterior skin coin Aposed of perticlesconipr*inthe-2pm .7

wrought metal article having a body portion of ordinary wroughtcharacter and Having an outer shell portion integral there- ."th the shelll portion having a portion of of/123 antially uniform density and homoity than the body portion and of the same chemical constituents and in substam gnfeity, of substantial depth, of a greater' tinlly the some` proportions as the body portion. 10 In testimony whereof, I have hereunto set N.M. GmFFIN, H. M. CORWIIN.