US2159371A - Method of making steel sections - Google Patents

Description

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METHOD OF MAKING STEEL SECTIONS Original Filed Jan. 1 6, 1935 2 Sheets-Sheet 1 Zmventor Way 0:40 5. 3mm

May 23,1939. w, ',B NK, 2,159,311

METHOD OF MAKING STEEL; SECTIONS Original Filed Jan'. 16, 1935 2 Sheets-Sheet 2 Zinnentor n m FIELD .5? ,w/v/r (Ittorneg Patented May 23, 1939 PATENT OFFICE n 2.11am

lemon or me s'rsm. sac-nous "winfleldillflnhfikrom'ohlmassignonbymeaneassignments, to The Firestone Tire & Rubber Company, Akron, Ohio, a' corporation at Ohio Original application January 10, loss, scar m 2,041, how mum No. 2,140,151, m m 1. 1939. Divided and this application August 1,

1m,- Serial No; scsss V s cum. zs-isan This invention relates to methods of making steel sections, and more especially it relates to procedurefor rolling steel rims such as pneumatic tire 1 I .Inthe manufacture or tire rims of the character mentioned, the steel blank or metal bar is heated and then hot rolled to a channel form that is as near the desired cross sectional iorm of the finished rim as possible. In this hot roll- 1 ing operation, however, it is impossible to form 1 on thejchannel lateral flanges which define a greater angle than approximately 80 with the ofthe forming rolls. Because this fact it is n, in the production of rims having an overhanging side gutter, that the'side fiance oi' the gutter be formed during the hot rolling operation at an angle of approximately to the axis oftfie'i'orming mils. 'lhe channel thus formed subsequently is cut to the'desired length,

I rolled to circular shape, and the ends welded together. Thereafter it is n by a plurality of cold rolling operations to turn the gutter up to an angle of with medial or base portion 0! the rim, and then over to approximately an angle I of 70 vwith the base, which will be an approximate angle oi with the axis of the rolls.

The side flange formed integral with the base of the rim, on the opposite margin from the gutter, alsoisperpendicular in partto the rim base a in the flnishedaim and therefore is required to be formed in a manner similar to that above described with relation to the gutter. Thus the combination of gutter and side flange in a single rim necessitated a hot rolled channel form in 8, which the side flange and gutter made angles of not more than approximately 80 with the axis oi the rolls, which fact in turn necessitated a plurality. of cold rolling operations to produce the perpendicular side flange and the overhanging.

d0 Butter.

'lhe chief objects of the invention are to derise a process 0! making an improved steel rim section wherein the overhanging feature of the gutter is eliminated and'a construction provided in lieu thereof that is capable of being shaped placeinthegutter.-

Rei'erringtol'igureloi'thedrawings, ilandii denote a pair of cooperating forming rolls which serve to hot-roll a channel I! into the so cross sectional form shown, which includes an upwardly extending flange it along one longitudinal margin of the web andasecond, downward- 1! extending thickened flange it along the other longitudinalmarginoifthewehthe latterflange 25 comprisingagutterll. Itwillbeseenthatthe baseorwebportionofthechannelisformed with a dihedral angle I! located substantially along the longitudinal center line of the web, said angle being approximately on that face of 80 the web that eventually becomm the inner peripheryofthetire'rhm'lisisclearly'shownin .Figure 1,thatportionofthewebthatinch1des gutterflangellisrolledsubstantiallyinparallelismwlththeax'u oftherollsllJLandmaybe :3 consideredthenormalplaneofthewebsothat theangleliisformedentirelybymnoithat portion of theweb which includes flange ll extending obliquely downward from the normal planeoitheweb. Itwillbeseenthatinthe 40 structuredescribed, the 1 188 Il may have ,a portion that is substantiallyperpendicular to the adjacent web' portion,yetsaidflange portion willbedisposedatanangleof'lOorlesswit-h relationtotheaxis of roll ll. 7

The gutter isalongitudinally extending groove of irregular profile, having a transversely arouate rear face ii extending'from its top to its bottom,astraightfrontwall I!" of shallowdepth and disposedperpendiculartotheaxisofroll ll. 50,

and a ledge li extending from the bottom of the gutter to the bottom of front wall ii", the Juneture of said walls and ledge being suitably rounded. The flange II in which the gutter II is formed is substantially thicker thanany other so portion of the web, and its marginal portion has a substantially semi-circular profile Il said semi-circular surface merging, on the under side strips of desired length, which strips are then of the flange, with an oblique or tapered surface l4" that extends upwardly toward the web I 2.

Because thegutter l5 comprises no overhanging or undercut surfaces, and because the perpendicular gutter face I 5'' is comparatively shallow or narrow, it is possibleto hot-roll the gutter side of the web to finished shape without inclining it atan angle to the axis of the rolls III, II. After cooling, the channel i2 is cut into shorter coiled to circular form andgthe ends of the respective coils welded together as is well understood in the art. The channels are so cut and -welded that in the resultant rings the web portion thereof that includes the gutter flange II is parallel to the axis of the ring, the web portion that includes flange l3 being disposed at an angle thereto and constituting a generally frusto-conical structure, as is most clearly shown in Figure 2.

The endless channel is next subjected to a single cold rolling operation whereby it is given its finished cross sectional shape. As is most clearly shown in Figure 3, the cold rolling operation is effected by the use of forming rolls l1, l8,

which rollsfflatten the web of the channel by drawing or' forcing the frusto-conical portion thereof outwardly into alignment with the normally disposed, cylindrical portion of the web,

whereby, portions of the side flange 13 are brought into perpendicular relation to the base or web. In Figure 4 is shown the finished tire,

rim complete with a removable retaining ring or flange 20 mounted upon the gutter flange I 4.

By the process,- described, a tire rim having a partly perpendicular side flange may be formed by a single cold rolling operation. The process has the further advantage that the deforming of the rim in the cold rolling thereof occurs solely in portions thereof where the metal is of least weight or thickness, whereby the operation is fanot in alimiting sense; accordingly, various modiflcations of the invention may be resorted .to without departing from the spirit of the invention or the scope of the appended claims.

What is claimed is:

l. The method of making tire rims which comprises hot rolling a steel bar to form a web that is relatively heavy and-still along one marginal portion and has a portion from adjacent its ion- .zgitudinal center line to its opposite margin bent downwardly on an angle below its normal plane, bending said web longitudinally and joining the ends thereof in such a manner as to produce a ring, the portion that includes the heavy mar-.

ginal portion being substantially cylindrical in shape and the other portion of the webdei'lning a frusto-conical figure, and then cold rolling the ringto cylindrical shape by drawing the irustoconical portion outwardly.

2. In the method of forming a rolled steel structure consisting of a transversely straight web portion, the flange portion extending. up-

wardly at substantially right angles to the web for a portion of its height along one longitudinal margin of the web and a second flange along the other longitudinal margin of the web, said last-- named flange extending downwardly below the webv and being generally V-shaped and thicker than other'portions of the structure, the steps which consist in hot rolling a straight steel bar to substantially finished dimensions with a portion of the web from adjacent its longitudinal center line tosaid first-mentioned flange bent downwardly at an angle to the remainder of the web to form a generally W-shaped structure, circling the structure and joining the abutting'ends thereof, and finally. shaping the structure by drawing said originally downwardly bent portion of the web radially outwardly to transverse align-'- ment with the remainder of the web.

3. The method of forming a tire rim havingv a, tire retaining flange on one lateral margin of the finished rim, and a heavy, relatively stifi side-' ring-receiving gutter portion on the other side thereof, having such dimensions and such shape that it can only. be hot rolled and cannot thereafter be distorted during subsequent manufacturing operations, which method comprises hot rolling a steel section to produce said gutter portion integral with a fiat base portion contiguous with said heavy portion and a portion contiguous with said flat base portion disposed angularly to form a dihedral angle, and whose margin is formed with an upstanding tire retaining flange, circling said section and joining the ends thereof to provide an annulus with said gutter in the periphery thereof, and with said angularly disposed portion forming afrusto-conical portion with said tire retaining flange on the smaller end thereof, and

thereafter expanding said frusto-conical portion

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