US1812247A - Rolling mill plant and method of operating same - Google Patents

Description

June 30,1931. w. c. OBERG Ei' AL. 1,812,247 I ROLLING MILL PLANT AND METHOD OF OPERATING SAME Filed Dec 27, 1928 4 shets-sheer l R e M G G a g E 11 iii-.1 1 N E Q N E w e. E

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June 30, 1931. w. c. OBERG ET AL 1,812,247

ROLLING MILL PLANT AND METHOD OF OPERATING SAME Filed Dec. 27/1928 4 Sheets-Sheet -2 June 50, 1931.

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June 30, 1931. I w, c. OBERG ET AL 1,812,247

ROLLING MILL PLANT AND METHOD OF OPERATING SAME Filed Dec. 27, 1928. 4 Sheets-Sheet 4 meniars: MAL/4M 6? 055a; and fin/QEEW I44 6ODEEBEEG.

Patented June 30, 1931 UNITED STATES PATENT OFFICE WILLIAM ,c. OBERGYAND ANDREW w. SODERBERG, or MUNHALL, PENNSYLVANIA v ROLLING MILL PLANT AND METHOD 'OF OPERATING Application filed December 27, 1928. Serial No. 328,814.

Ourinventionrelates to rolling mill plants for rolling structural material such as wide flange H and I-beams and standard flanged shapes.

part of this specification, Figure l'is a plan I showing one portion of a rolling mill plant and Figure 1 is a similar plan showing the remainder that is constructed in accordance with our invention. A complete plan of the mill will be shown by joining Figures 1 and 1 on the lines XX of these figures.

Figure 2 is a diagrammatic side elevation of one portion and Figure 2 of the remaining portion of the mill plant of Figures 1 and 1, a complete side elevation being obtained by joining Figures 2 and 2 011 the lines YY. Figure 3 is a side elevation showing the rolls of a two-high reversing blooming mill adapted for use in our improved mill plant.

Figure 4 is a side elevation showing the rolls of the two-high reversing edging roll stand and Figure 4 the rolls of the universal reversing roll stand forming the roughing 22 roll train.

Figure 5 is a side elevation showing the rolls of the universal reversing roll stand and Figure 5 the rolls of the reversing edging roll stand forming the intermediate roll train.

Figure 6 is a side elevation showing the finishing roll train. I

In the accompanying drawings, the numeral 2 designates vertical ingot heating furor like materials that are to be rolled into blooms in the reversing blooming roll train 3v bloom into two or more lengths.

On the delivery side of the shear is a reversing roughing roll train 7 for rolling the shaped blooms after they are cropped and on the delivery side of this roll train, and at adistance therefrom, is the intermediate reversing roll train 8. On the delivery side of the intermediate roll train is a universal Referring now to the drawings forming rolls of the universal roll stand forming the naces or soaking pits for heating the ingots stand forming the finishing'roll train 9 and,

at a considerable distance beyond the finishv 'ing roll stand is a hot saw 10 forming the means for cropping and cutting the rolled shapes to length.

The roughing roll train 7 comprises a reversing stand 11 of two-high edging rolls A I which are driven through pinions 12 by a reversing electric motor'13 and a reversing stand 14 of universal roughing rolls, having horizontal rolls which are driven through pinions 15 by a reversing motor 16 and vertical rolls driven by frictional contact with the material being rolled.

The intermediate roll train 8, which in construct-ion is a duplicate of the roughing train 7 comprises a reversing stand 17 of universal rolls having horizontal rolls driven through pinions 18 by a reversing motor 19 and vertical rolls frictionally driven by" contact with the material being rolled, and

a two-high stand 20 of edging rolls driven through pinions 21 .by a reversing motor .The finishing roll train 9 comprises a universal stand having a pair of horizontal rolls which are driven through pinions 23 by a motor 24, and a pair of vertical rolls which are driven by contact "with the materialrolled on the mill.

A tilting delivery car 25, which travels on the track 26 alongside the soaking pit furnaces 2, delivers the heated ingots from the furnaces to the transfer table 27 which-runs on the track 28 that extends lengthwise at right angles to the track 26. The transfer table 27 carries the ingots received from the delivery car 25 into position to be delivered to the roller feed table 29 in front of the blooming train 3. A second roller feed table 30 on the opposite or rear side of the rolls back and forth movements given it when it is being shaped in the roughing train.

Extending between the universal roughing roll stand 14 of the roll train 7 and the universal roll stand 17 of the intermediate ou train 8 are two roller feed tables 33 and 34. These tables, which are arranged side by side, are connected by lateral skids 35 on which the partly rolled shapes are transferred sidewise from the feed table 33 to the feed table 34, into position to be moved lengthwise into the universal roll stand 17 of the intermediate roll train 8. Extending from the delivery side of the edging roll stand 20 of the intermediate roll train 8 and .the receiving side of the universal finishing roll stand forming the finishing train 9 is a feed table 36 for carrying the shapes being rolled between these roll trains and on the delivery side of the finishing roll train 9 are two roller feed tables 37 and 38 arranged side by side and connected by lateral skids 39 for carrying the shapes, as delivered from the finishing train 9 to the hot saw 10 by which the rolled shapes are cropped and, in some cases, cut to length.

The feed table 38 also carries the sawed shapes away from the saw to straightening machines, storage bins or other places of dis posal.

The blooming mill 3, as is shown in Figure 3, has a grooved top roll 41 which is adjust able vertically and a similar grooved bottom roll 41, the opposite grooves registering to form passes 41, 41 and 41 in which heated ingots of rectangular cross-section are elongated and shaped into blooms of the required contour and transverse dimensions.

The ingot is rolled down in the pass41, turning it at right angles between passes until it has the desired rectangular cross-section. It is then rolled back and forth several times through the pass 41 to hollow the sides and taper the ends sufficiently for the final reductions in the pass 41.

This pass may be of the usual cogged bloom shape fon rolling I-beams and H- beams. The subsequent rolling operations, however,.are facilitated by giving the pass the peculiar shape shown. The rolls on the inner faces 41 of the pass 41 are flared at something more than a right angle and have their bottom faces 41 at approximately a right angle to the faces 41. Consequently the cogged bloom has the opposite edges of each flange tapering toward the outside. This has advantages in the edge rolling oper; ation referred to below.

The roughing roll train 7 of Figures 1 and 1, as is shown in Figure 4, comprises horizontal top and bottom rolls 42, 42 form- 'mounted in the roll bearings ing the edging roll stand 11 and a universalthe universal stand 14 have their axes in the same vertical plane, as is shown in Figure 1, and the rolls stands 11 and 14 are in tandem and relatively located neous edging and reducing operations at differing points in the length of a shape being rolled and also permit, when found expedient, for one stand to operate on the shape while the other is inoperative.

In rolling shapes in our improved rolling mill plant the shaped blooms will be formed by the initial rolling operations in the roughing train to have the opposite surfaces of the flange portions on each edge of the web inclined outwardly at a slight angle and thereafter these flange portions will remain in such outwardly inclined relation to the web portion until the shape is practically finished in the intermediate roll train and in readiness to enter the finishing roll train.

1n the finishing roll train 9, the outwardly inclined flange portions are straightened by bending them into normal position, in which the side surfaces of the flange portions extend at right angles to the surfaces of the web portion in the finished shapes.

When producing shapes having a slope on the inner surface of the flange portions in -dis tinction to the improved type in which the inner and outer surfaces of the flanges are parallel, the inner faces of the flanges will be formed at a greater angle in the intermediate train, the ends of the rolls 54 being beveled accordingly and the outer surfaces of the flange portions will be made to extend at right angles to the web surfaces in the finishing stand of rolls 9.

The pair of edging rolls 42, 42 of the edging stand 11 of the roughing roll train 7 are duplicates in shape and ,size and have a cylindrical body portion 8. The body portion has frusto- conical end portions 44, 44 and edging collars 45, 45. These rolls also have necks 46, '46 .by which they are rotatably (not shown). The peripheral surfaces 47 of the collars 45, which engage with and edge the toes of the flanges of the shapes to prevent excessive spreading or increase in length of the flanges of the shape being rolled, and to determine' the length of the flanges, are frusto-conical and the edging surface 47 of these collars extends at right angles to the end surfaces 44 of the rolls 42.

In the universal stand 14, forming part'of the roughing roll train 7, the two horizontal rolls 43, 43 which are duplicates, have a body portion 49 which has frusto-conical- end surfaces 50, 50 and cylindrical collars 51, 51 from which the roll necks 52, 52 extend. The necks of these rolls are mounted in suitable to permit of simultabearings (not shown) and the rolls are relatively ad1ustable in a vertical direction.

In the universal stand 14 of the roughing train 7 apair of vertical, frictionally driven side rolls 60, 60 operate on and are driven by .contact with the outer' surfaces of the flanges of the shape being rolled, these flanges extending between the peripheral surfaces of'the vertical rolls and oppositefrusto-conical end surfaces 50 of the horizontal rolls 43 during the shape-rolling operations. The vertical side rolls 60, which. are duplicates, have oppositely tapering peripheral surfaces53, 53, being larger in diameter at the middle of their length than at their ends and sloping at opposite angles, being inclined in the same direction as the adjacent frusto-conical end surfaces 50 of the horizontal rolls 43.

7 The vertical rolls-60 are mounted by means 7 of suitable pins or shafts on vertical-roll carriers (not shown) so as to be adjustable horizontally toward and away from the continuous end surfaces of the horizontal rolls. D The'horizontal rolls 43 and vertical rolls 60 of the universal stand .7 are arranged with their axes all in the same vertical plane, so as to form roll passes in which both side surfaces of the web and both side surfaces of the flanges of the shapes are simultaneously engaged and the flange and web thicknesses simultaneously reduced in the rolling operations, a relative adjustment of all four rolls in the roughing stand 7 being efl'ected after each reducing pass to which the shape is sub-' jected. v

The intermediate roll train 8, except in one important particular, is a duplicate of the roughing roll train 7, and similar parts are designated by the same numerals as in the roughing roll train with a prime mark addedthereto. Being of the same general construction, the description of the roughing train 7 applies to the'intermediate train 8 and will not be repeated. The particularly important difference in theroll trains 7 and 8 is be seen that the'edging roll stand 11 is on roll train 9 differs from the roughing and the intermediate roll trains 7 and 8 in that it does not have an edging roll stand although, in a general way, it is of the same construction as the universal stands forming part of the other roll trains. Its prmclpal purpose being to straighten the flanges and planish the shapes after they have been rolled in the other roll trains, the finishing roll train may be of lighter construction. But the finishing stand 9 has horizontal rolls 54,

54 and vertical rolls 55; 55 with their axes in the same vertical plane and the vertical rolls 55 are driven by frictional contact with the outer surfaces of the shapes.

As will be seen in Figure 6, the end surfaces of the horizontal rolls are flat surfaces extending at right angles to the cylindrical surface 56 of these rolls, and the vertical rolls have cylindrical surfaces 57 to engage with theouter surfaces of the flanges of the shapes in the shape finishing operationsa As the final length of the flanges of the shapes is fixed by the edging rolls ,of

the intermediate roll train, the cylindrical collars 58 on the rolls of the finishing train do not engage the toes of the flanges but do serve to connect the roll necks 59, 59 to the roll body. Y

I -The horizontal rolls 54 are duplicates in size and contour and one vertical roll 55 is the same as the other in the finishing train 9, and the rolls are mounted in bearings in the same manner as the universal stands of the roughing train 7 and intermediate train 8. I In operating our improved rolhng mill plant the heated ingots are withdrawn from the soaking pits 2 and are delivered by the tilting delivery car 25 and transfer table 27 to the feed table 29 in front of the blooming roll train 3. The ingot is then given a series of back and forth reducing passes in the mill forming the blooming train of rolls and thereby shaped into a bloom of the desired size and contour. The bloom is then carried by the feed table 20to the shear 6 where the ends of the blooms are cut off or cropped The nuinber of-back and forth passes given the ingot will vary, being dependent upon the size of the ingot and size of bloom desired.

It will be understood that the shapes of any given size are rolled to various weights and that the shaped bloom will vary accordingly in cross-section. v

The shaped bloom isthen delivered by the feed tables 31, 32 to the roughing roll train 7 and, after being rolled and partly completed therein, is delivered by the feed tables 33, 34 to the intermediate roll train 3 in which it is further rolled and practically finished as to size and overall dimensions.

' The bloom, as deliveredfrom the blooming,

roll train 3, will first be engaged by the rolls of the edging stand 11 the initial pases of,

which establish the len h of the flange portions desired in the finished product) and 'then by the rolls of the universal stand 14 of the roughing train 7, different parts in the length of the bloom being simultaneously rolled. In the next pass, which is in the opposite direction, the bloom will be further reduced.

The edging rolls of this train will fix the web length A and the universal rolls will shape the inner and outer surfaces of the flange portions to incline outwardly and fix the web length A in the initial rolling passes. Thereafter, the edging rolls will only be employed to prevent excessive spread of the flange portions and restore the flange length B when it spreads beyond that established in the initial (edging) pass in the roughing train.

After being rolled to the desired extent in the roughing roll train 7 the partly rolled shape is transferred to the intermediate train 8 where it is further elongated and reduced in cross-sectional area, the edging rolls of the stand 20 being employed to prevent spreading of the flange portions and maintain the flange length established in the initial passes in the roughing train. 4

After the shape has been given sufficient rolling passes to reduce its web and flanges to the proper thickness it is delivered to the finishing roll train 9 to be completed therein, as has been described, and in this, the last pass in the intermediate roll train 8 the edging rollsengage the toes of the flange portions of the shape and accurately finish the flanges to length.

The rolled shape is then delivered by the feed table 36 to the finishing train 9 in which the flanges are straightened and the flanges and web of the shape are slightly reduced in thickness, the single pass given the shapes in the finishing train being a planishing and flange straightening operation. Nowork is done on the flange edges, the edgesbeing fin ished and the flange length being fixed in the last pass 'given the shape in the edging stand 20 of the intermediate roll train 8.

The finished shape is then transferred on the feed tables 37 and 38 to the hot saw 10 where the shape is cropped on one end and, when expedient, cut to length by cropping the other end, and is then carried away from the saw 10 by the feed table to be straightened or stored.

In the roughing roll train and also in the intermediate train of rolls, each stand is driven by a separate variable or adjustable speed motor. Taking Figure 4, for example, the chief draft is on the edging collars of the edging stand and on the web and flange rolling bodies 43, 53 of the rolls of universal stands.

The motors are adjusted to drive the tw stands at speeds which are proportioned to the diameters of the edging collars 45 and the web rolling bodies 43, The result is a substantial uniform linear speed in the two stands so that they elongate the flange and web portions of the work at substantially slip, therefore, is reslip, one or both of the motors is adjusted to a greater or lesser speed so as to maintain substantially the same linear, that is, circumferential surface/ speed for the draft faces of the edging rolls and web reducing rolls, respectively. The same considerations apply to the intermediate train of Figure 5.

The body portions of the edging rolls are of such diameter as to slightly clear the faces of the web and thus leave the edging collars free to exert the desired draft on the edges of c the flange portions of the work. frusto-conical ends 44, 44 make a right angle with the frust0-conical edge rolling faces 47, 47, particularly' at the point where these two frusto-conical faces join. Thus, .the

flange portions of the work are supported onthe inside surfaces and a sharp corner is formed on the toes of the flanges. The edge The 47 on one roll and that in line with it on the other roll exert pressures on the work which are not in line with each other nor at right angles to the axis of the web, but converge toward the center of the w rk.

In fact, the pressures exerted by the four edging faces in any edging stand converge towards each other. Such pressures tend to upset the metal intb the flange portions of the work rather-than to bendsuch flange portions. In this way, the length of the flange portions is restored, whatever extension thereof may have taken place in the next previous universal mill operation.

In previous efforts 'to combine universal rolls with edging rolls, the edge rolling has been done with pressures at right angles to the axis 'of the web and to prevent bending outward. Or, where this tendency has been restricted by the use of vertical rolls on the outer faces of the flange portions, the resulting closed pass has caused the formation of fins on the outer corners of the work whenever there has been an overfill of the pass, which frequently occurs to a slight extent. The inclined pressures of the present apparatus avoid the tendency to bend the flange portionsand also avoid the use of closed passes.

The described apparatus is comparative-- ly economical and permits the production of a large output of accurately finished work..

50 methods, and ensures the production of been a common defect in similar shapes, as

and negligible variation. The useof a sep arate finishing stand, through which the finished section makes but one light pass, permits of the production of sections whose flanges have parallel sides with a minimum of wear and a greatly reduced roll cost, as compared with any other method in use.

The edging rolls have their body portions designed to approach within a very close distance of the web so as to practically contact therewith without draft thereon. This determines the central location of the web in the finished product. For producing different flange lengths, therefore, we use edglng rolls which have the same diameter at the point where the toe of the flan e is worked but have different diameters o the central body portion so as tomaintain the approximate fit against the web of thework. Thisuse of a uniform diameter of the edging collars for different sizes of work also makes it easy to maintain the desired uniformity of linear or peripheral speed in the two stands through which the work passes at one time. For example, the ratio of the universal stand speed to the edgin stand 'speed is approx-1- mately constant w ether the section being rolled has flange portions five inches high or many more inches high over all. Thus, we need to provide adjustment in the motors for only 'such speed differences, as are caused by elongation of the work and 'unequal re duction of rolls, due to wear and re-turning.

Our method not only produces work which is. free from overfills or fins on the outer edges but also avoids the fillet markings which are produced by other apparatus and beams with flanges of accurate and uniform length.

The use of individual, variable speed motors for driving the rolls of the ,edging stand and the universal stand of the requiredvariation in peripheralspeed of the respective rolls made necessary by the elongation of'the shape effected in the universal stand when the shape is travelling from the edging into the universal stand and the required uniform peripheral speed of the rolls ofthe edging stand and the universal stand when the shape is travelling from the universal stand into the edging rolls, and in this way-avoids slippage which otherwise would occur in the rolling operations.

Various modifications may be made'in the details'and in the arrangement of the roll trains and stands, and in the steps of the process without departing from the invention, as defined in the following claims.

lVe claim:

" 1. In a rolling mill plant aroughing roll train having in combination an edging roll stand and a universal roughing roll stand; a second roll train having in combination a universal reducing roll stand and an edging roll stand, said roll trains being relatively positioned to locate the universal roll stands betweenjthe edging roll stands, a variable speed driving motor for each roll stand, and means for conveying the materials being rolled to and from said roll trains.

2. In a rolling mill plant a roughing roll I the discharge side of the edging roll stand of the intermediate roll train, a variable speed driving'motor for each roll stand, and means for conveying the materials being rolled to and from said roll trains.

\ 3. In a rolling mill plant a reversing roughing roll train having in combination an edging roll stand and tandem universal roughing roll stand, a secondreversing roll train having incombination a universal reducing roll stand and tandem edging roll stand, said roll trains being relatively positioned to locate the universal roll stands between theedging roll stands, a variable speed driving motor for each roll stand, and means for conveying the materials being rolled to and from said roll trains.

4. In a rolling mill plant; a reversing roughing roll train having an edging roll stand and tandem universal roughing roll stand, a second reversing roll train having a universal reducing roll -stand and tandem edging roll stand, said roll trains being relatively positioned to locate the universal roll stands between the edging roll stands, the

trains being positively driven by separate variable speed motors and the vertical rolls of said universal stands being frictionally driven by contact with the-materials rolled in. the roll trains, and means for conveying the materials being rolled to'and from said roll trains.

5. A roll train for rolling flanged shapes having an edging roll stand and a universal 'reduing roll stand, in combination with variable speed motors for driving the stands reducing roll stand and an edging roll stand,

said roll trains being relatively positioned to locate the universal roll stands between the edging roll stands, the rolls of the edging roll stands having ed 'ing collars for reducing and maintaining the flange length of the shapes being rolled and the rolls of the universal stands having web reducing peripheries, separate variable speed motors for driving the stands at a speed ratio corresponding to that of the flange edging collars of theedging stand and Web reducing roll bodies of the universal stand so as to produce a substantially uniform peripheral speed thereof, and means for conveying the materials being rolled to and from said roll trains.

7. In a rolling mill plant for rolling flanged shapes, a reversing roughing roll train having an edging roll stand and a universal reducing roll stand, a second reversing roll train having a universal reducing roll stand and an edging roll stand, said roll trains being relatively positioned to locate the universal roll stands between the edgingstands, the rolls of the edging roll stands having edging collars for reducing and maintaining the flange length of the shapes being rolled and the rolls of the universal stands having web reducing peripheries, and separate variable speed motors for driving the two stands. I

8. A roll train for rolling flanged shapes having an edging roll stand and a universal reducing roll stand, in combination with motors for driving the stands at a speed ratio corresponding to the ratio of the diameters of the edging faces of the edging roll stand and the web reducing faces of the universal roll-stand respectively so as to produce a substantially uniform peripheral speed of such faces, the edging rolls and horizontal rolls of said roll trains being positively driven and the vertical rolls of the universal stands 'being frictionally driven by contact with the shapes rolled in the roll trains. v

9. In a rolling millplant for rolling flanged shapes the combination of a tandem two-high universal stand and an edging roll stand said stands simultaneously operating on the flanges and web portions of the shape, and a universal finishing roll stand withoutedging means and arranged in position to receive the work from the edge rolling stand.

10. In a rolling mill plant for rolling flanged shapes the combination of edge rolling stands with at least one universal stand betweer them so that as the work is advanced it passes first through an edging stand, then through at least one universal stand and then through an edging roll stand.

11. In a rolling mill plant for rolling flanged shapes the combination of edge rolling stands with at least one universal stand between them so that asthe work is advanced it passes first through an edging stand, then through at least one universal stand and finally through an edging roll stand, to and through a universal stand said universal stand being in position to receive the work from the second edging roll stand and providing a final sizing 'pass for finishing the product.

12. The combination of a universal stand and an edging roll stand, the edging roll stand having rolls with edging surfaces and having a body portion in which the operative position of the edging surface effects substantially a contact without draft on the web of the work so as to determine the central position of such web with reference to the edges of the flanges.

13. The combination of a universal stand and an edging roll stand, the edging roll stand having rolls with angular edging surfaces and having a body portion which in the operative position of the edging surface effects substantially a contact without draft on the web of the work so as to determine the central position of such web with reference to the edges of the flanges, and a finishing universal stand to which the work is delivered from said edging stand and which provides a pass efliecting only a slight reduction. 14. The combination of a universal stand and an edging roll" stand, the edging roll stand having rolls with edging surfaces and having a body portion which in the operative position of the edging surface eifec'ts substantially a contact without draft on the web of the work so as to determine the central position of such web with reference to the edges of the flanges, and motors for driving the two stands at a speed ratio corresponding to that of the edging faces-of the edging rolls and the web reducing faces of the universal stand, allowing for elongation of the work. i

15. In the rolling of flanged shapes the steps comprising first rolling a flanged bloom in a roughing roll train having an edging roll stand and tandem universal roll stand, and then further rolling the partly reduced shape in a escond roughing roll train having a universal roll stand and tandem edging roll stand, and finally finishing the rolling operations in a universal finishing roll stand, first reducing the flange width before reducing the flange and web thickness of the bloom in the initial rolling pass in the roughing roll train, further reducing the flange and Web thickness of the partly rolled shape and afterward rolling the flange edges in the final pass and then further reducing the flange and web thickness, and finishing the shape in a final shaping pass in the finishing rollstand of the mill.

16. In the rolling of flanged shapes the steps comprising first rolling a flanged bloom reducing the flange and web thickness and fin- 1slnn g the shape 111 the unlversal fimshlng roll stand, first reducing the flange width of the bloom before reducing the flange and Web thickness in the initial pass in the roughing roll train, shaping the bloom with its flanges out of normal position in the reducing passes in the roughing roll train, reducing the flange and Web thickness and afterward rolling the edges of the partly rolled shape in the final pass in the second roll train, maintaining the flanges out of normal position in rolling the shape in the second roughing roll train and finally reducing the flange and web thickness and bending the flanges to normal position in finishing the'shape in the universal finishing roll stand of the mill.

In testimony whereof, we have hereunto set our hands.

WILLIAM C. OBERG. ANDREW W. SODERBERG.

roughing roll train, further reducing the v flange and web thickness of the partly rolled shape and afterward rolling the flange edges in a final pass in the second roughing roll train and then reducing the flange and Web thickness and finishing the shape in a final shgping pass in the finishing roll stand of the mi 1..

17. In the rolling of flanged shapes the steps comprising first rolling a flanged bloom in a roughing roll train having an edging roll stand and tandem universal roll stand, and then'further reducing the partly rolled shape in a second roughing roll train having a universal .roll stand and tandem edging roll stand and finally finishing the shape in a universal. finishing roll stand, first reducing the flange width of the bloom before reducing the flange and web thickness in the initial pass in the roughing roll train, shaping the bloom with its flanges out of normal position in thereducing passes in the roughing roll train, reducing the flange and web thickness and afterward rolling the edges of the partly rolled shape in the final pass in the second roll train, maintaining the flanges out of normal position in rolling the shape in the second roughing roll train and finally reducing the flange and web thickness and bending the flanges to normal position in finishing the shape in the universal finishing roll stand of the mill.

18. In the rolling of flanged shapes the steps comprising first rolling a flanged bloom in a series of back and forth-passes in a roughing roll train having a reversing edging roll stand and tandem reversing universal roll stand and then further rolling the partly reduced shape in a series of back and forth passes in a second roughing roll train hav ing a reversing universal roll stand and tandem reversing edging roll stand and finally

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