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July 26, 1938. 2,124,88O E. B. HUDSON REVERSIBLE ROLLING UNDER CONTROLLED TENSION Original Filed-Oct. 23, 1934 5 Sheets-Sheet l INVENTOR.‘ Emu/N13 Hausa/v. BY - M10 # w ATTORNEYS, July 26, 1938'. 2,124,880 E. B. HUDSON REVERSIBLE ROLLING UNDER CONTROLLED TENSION Original Filed Oct. 23, 1934 5 Sheets-Sheet 2 N ‘ INVENTOR. ?aw/MB. Hausa/v. ATTORNEYS. July 26, 1938. E. B. HUDSQN . 2,124,8G REVERSIBLE ROLLING UNDER CONTROLLED TENSION Original Filed Oct. 23, 1954 5 Sheets-Sheet 3 “N ATTORNEYS. July 26, 1938. 2,124,880 E. B. HUDSON REVERSIBLE ROLLING UNDER CONTROLLED TENSION Original Filed Oct. 25, 1934 .5 Sheets-Sheet 4 INVENTOR. [aw/1v 5. Hausa/v ATTORNEY$_ July 26, 1938. E. B'. HUDSON 2,124,880 REVERSIBLE ROLLING UNDER CONTROLLED TENSION Original Filed Oct. 23, 1934 5 Sheets-Sheet 5 630 EL. INVENTOR. EDMNB. Hausa/v. ATTORNEYS_ 2,124,880 Patented July 26, 1938 UNITED STATES PATENT OFFICE 2,124,880 ‘ ‘ REVERSIBLE ROLLING UNDER CON TROLLED TENSION / Edwin B. Hudson, Middletown, Ohio, assignor to , The American Rolling Mill Company, Middle town, Ohio, a corporation of Ohio Original application October 23, 1934, Serial No. 749,591‘. Divided and this application October 23, 1934, Serial No. 749,592 6 Claims. (01. 80—32) ' ‘My. invention is addressed to the rolling of conditions. An attempt to control the speeds of metal under tension, and will ?nd its greatest the various dynamic instrumentalities in the sys utility in the rolling of long strips of metal back tem in accordance with tension variations in the strip, does not wholly succeed became, once there wardly and forwardly in a reversible mill or mill ' 5 combination. For the purpose of disclosing my invention in a clear and readily appreciable man ner, I shall describe it in a particular embodi ment, it being understood that this embodiment is exemplary only, and that my inventionis not 10 limited otherwise than as set forth in the ap pended claims. -A method of tension rolling the rolled piece has been produced. Moreover it is not desired to place any great quantity of apparatus between the mill and the coilers be cause this increases the length of unrollable strip between the mill and the ultimate attachment 10 of the strip to the coiler drums. Since some of whereby end wastage is eliminated, which is the variations may be cumulative, control of the described and claimed in a copending applica speeds of the several dynamic instrumentalities is desirable; but because no speed control has rapid enough response to take care of the spo 15 radic tension variations, it is necessary to pro; vide some means which will keep the tension constant and unvarying in spite of the factors tending to produce tension change, and then to control speeds in accordance with variations of elongation. This implies means to take up at least a short length‘of strip under a constant force. Finally, there is ordinarily desired in ten tion, Ser. No. 724,931, ?led May 10, 1934, and -15 entitled Apparatus and process for tensioned cold rolling in reversible mills, may be employed if desired with the apparatus and method of this invention, with such appropriate apparatus ad ditions as will be understood from a reading of. 20 the said copending case. This'is a division of my co-pending application Ser. No'. 749,591, ?led October 23, 1934, and en titled Tension apparatus for reversible mills. It has hitherto been suggested to roll metal of 25 strip length and sheet width backwardly and for .wardly through a mill, say, of the four-high type with small working rolls capable of making a heavy vreduction per pass. On either side of the mill an apparatus in the nature of a tight coiler is placed. The coiler ahead of the mill, when the strip is moving in one direction, is driven to exert the desired forward tension on the piece, while the coiler behind the mill is braked to exert the 35 has been a variation in the tension a variation in desired back tension. Each coiler is arranged to act alternately as a braking or ~pulling device as the direction of roll ing is changed. 7 It will be clear that a system of- this kind presents certain problems, some of which will 40 be set forth. In the coiling devices, Whether used as pullers or as brakes, for a given force applied to the shafts of the drums, theforce applied to the strip will vary inversely to the diameter of the coils on the drums, as will be obvious. The most perfect rolling under tension is dependent upon continuously uniform and unvarying ten’ sion, since with a given setting of the rolls a difference in gauge will follow a difference in tension. Even if provision were made in some 50 way that the pulling and braking coilers could exert a, constant force upon the strip, yet one would be confronted with those continual and ‘sporadic variations in elongation which arise . from non-uniformity of gauge, strain or hardness 55 in the piece being rolled, and from other rolling sion rolling a positive tension di?erential, i. e. a greater tension in the strip on the outgoing side 25 of the mill than on the incoming side. Since the mill is a reversible mill, this condition must like wise be made reversible. The solution of these problems constitute the major object of my invention, together with the 30 provision of a‘ relatively simple and compact ap paratus easily kept in repair. The ancillary ob jects of my invention will be understood by one skilled in the art upon reading these speci?ca tions, wherein I shall describe the aforesaid ex 35 emplary embodiment. Reference is now made to the drawings wherein: Figure 1 is a vertical sectional view of my ap paratus with parts removed for the sake of clear 40 ness. Fig. 2 is an elevational view of an adjustable accumulator device. ‘ . Fig. 3 is a plan view of the mill, one of the coilers, and the drives therefor. Fig. 4 is an end elevation thereof.v 45 Fig. 5 is a side elevation of a coiler and its mountings. Fig. 6 is an end elevation thereof. Fig. 7 is a plan view of my accumulator. Fig. 8 is an end elevation thereof. ~ Fig. 9 is an elevational view of an exemplary braking ‘apparatus. ' ' Brie?y, .in the practice of my invention I pro vide a reversible mill I (reference is made to Figs. 1 and 2 for a better understanding of this 56 2,124,880 2 brief description). This mill is preferably of the ?uid is desired. A gauge 36 may be calibrated four-high type. Guide rolls 2 and 3 are shown to read in pressure or in strip tension. It will adjacent the mill. On either side of the mill _ be understood that the ?uid pressure produced by this type of accumulator may be readily varied there is a coiler, the drums of which are indi cated at 3 and 4. These drums, instead of being by tilting the cylinder 25 on its trunnions. The UK mounted in the ordinary frames, are held in pressure will be greatest with the cylinder in,a vertical position, vand will be scaled down to zero crook-shaped cradles 4a and 5 which are pivoted as the cylinder is turned in either direction to the boiler frames 6 and 1 below the drums as at 8 and 9. through an angle of 90 degrees. Thus, as the cradles tilt, the drums chinery, and the tilting of them, may, by simple and readily understandable means, be made auto under constant forces. In this way I have pro 15 vided for a structure in which sporadic varia tions in elongation may occur without affecting tension, since these variations are taken up by movements of the cradlesgand drums. The extent of movement of the drums is, of course, matically'responsive to a reversal of the mill. I shall now proceed to a more particular de I 20 limited; so that it is advisable to control the speeds of the various instrumentalities in accord ance with variations in elongation. Each drum will be understood to have a drive, such as an electric motor. Rheostats for these motors re 25 spectively are shown at 12 and I3, each equipped with sheaves l4 and 15. Cables l6 and I1, con nected with arms on the respective cradles, pass over these sheaves and are counterweighted as at I8 and I9. Thus variations in the positions 30 of the cradles will produce corresponding varia tions in the drum drives, although a lost motion connection may be made therebetween so that there will be a central zone of no control. It will be understood that the drums may likewise 35 be equippedv‘with braking means for main lieu of a drive when any particular drum is paying out strip. ' The mill may be of any suitable type, equipped or not with means for compensating for the 40 offsetting of the working rolls as the direction of rolling changes. I have shown vat 20 a loading device for the entrance cradle, and at 2| a re ceiving device for the exit cradle. The exit cradle is tiltable so that the drum 4 will run'out 45 onto the receiving device. Accumulators of this type form a facile means of adjusting the 10 forces acting on the take up means, speedily and accurately. The cylinders may be tilted by ma 10 are brought closer to or further from the rolls of the mill. Hydraulic or other ?uid pressure cylinders l0 and H tend to. rock the cradles so as to urge the drums away from the mill rolls Overhead handling equipment is indicated at 22 and 23. It has been pointed out hereinabove-that in most instances a positive differential in tension is desired in the direction of rolling. If this were not so, the cylinders I0 and II might continu ously have equal fluid pressures imposed upon them, and might conveniently be loaded from the same accumulator. But if rolling is proceed ing with movement of the strip 24 to the right in Fig. 1, there will preferably be greater ?uid pressure in the cylinder ll than in the cylinder l0; and when the mill is reversed the reverse of these conditions is desired. This may be accom plished by providing a separate accumulator for 60 each of the cylinders, and effectively changing the weights on the accumulators as required. I have devised a simple apparatus for this purpose which I have shown in Fig. 2. Here the accumu lator comprises a cylinder 25 mounted on trun nions 26 in a frame 21. A piston, is pivoted to a connecting rod indicated at 28, pivoted in turn to a yoke 29. Rods 30 and 3| are connected at one end to this yoke, pass externally of the cylinder and are guided thereon by rolls 32. Weights 33 are connected to these rods. Con nection to the cylinder may be made through a trunnion, and I have indicated at 34 a line con necting the cylinder 25 with a cylinder l l on one of the cradles. A branch 35 of the line may lead 75 to a pump for oil, water, or whatever pressure scription of an exemplary embodiment of the various mechanisms which I employ. I have shown in Figs. 3 and 4 the mill, one of the coilers, and the drives therefor. A motor 31, for driving 20 the mill, is reversible or is equipped with a re versible drive. It is directly connected, driving, through a suitable coupling 39, a mill pinion stand of known type. Splined shafts 4| connect the pinions of the stand with the rolls Ia of the mill. A second motor 42 drives a gear box 44. The low speed shaft of this gear box is connected through a universal coupling 46 and a splined shaft 41 directly to the drum 3 of one of the coilers. The high speed shaft of the pinion stand is connected by a coupling 45 to the shaft 48 of a braking device. This shaft bears a drum 49 connected thereto by an over-running clutch located within the drum. The over-running .' clutch makes it unnecessary otherwise to con nect and disconnect the brake. Cables 50 are wound around the drum to react frictionally therewith. The braking arrangement is more clearly shown in Fig. 9, where 49 again indicates 40 the drum, and 50 the cables. The cables are dead-ended to a base as at 50a. The base bears a standard 51a, to which a scale beam 5| is pivoted as at 5lb. The other end of the cables 50, which is in the form of a loop, is passed over a sheave 50b, mounted upon the scale beam 55. A reversible motor 52 is mounted upon the scale beam, and bears a threaded shaft 52a extending therealong. A weight 5lc is threaded on the shaft 52a, and is arranged to move along the scale beam when driven by the motor 52. It will be clear that as the weight 510 (which has provision for being additionally loaded as de sired) is moved outwardly along the scale beam, the tension on the cables 50 will be increased. 55 and the braking action, and therefore the back tension on the piece being rolled, will likewise be increased. The motor 52 may be controlled by hand if desired, but it is more convenient to do this au 60 tomatically to control the braking action in such a way that the back tension may be maintained uniform. Since at the time of rolling in the one, direction that coiler which is braked will not be positively driven by its corresponding driven 65 motor, such a control amounts to a control of a dynamic instrumentality in the "assembly, and may be affected by similar means. It is conven ient to attach a switch to the corresponding cradle, say, cradle 4a in Fig. 1, so that when this 70 cradle has rocked a predetermined distance in a counter-clockwise direction the motor 52 will be started up and driven forwardly so as to move the weight 51c outwardly along the scale beam until the said motion of the cradle has been ar 76 3 2,124,880 In order to give to the roller vin a place ready rested. Likewise when the cradle moves a pre determined distance in a clockwise direction, a switch actuated thereby is effective to start'the accessible to him a de?nite indication of for ward and back tensions, I have shown indica tors b and b’ on the frame of the mill 1. These indicators are driven from the respective hy motor 52 in a reverse direction so as to bring the weight 5|c inwardly along the scale beam until the motion of the cradle has stopped. With the suggestion of the automatic operation of the draulic accumulators in any way desired. Pref erably they are calibrated to show tension in convenient units. Actually they indicate the angularity of the hydraulic accumulators, and motor 52, the switching arrangement will be clear to one skilled in the art. The over-running clutch referred to, located may be directly driven from the trunnions 26 of 10 the accumulators through ?exible shafts. I ?nd within the drum 49 or in connection with the shaft 48, renders the brake ineffective when the it more convenient, however, to connect a selsyn corresponding coiler drum is being positively driven in a pulling direction by its motor. How ever, during the threading operations of the ap the coiler motor in a reverse direction, which “ indicates the advisability of the provision of some ‘ motor, indicated at C in Figures '7 and 8, with the corresponding one of the indicators b or b’ in Figure 1, which is equipped with a selsyn 15 motor. The connections therefore become elec tric rather than mechanical, and the indicators give a de?nite indication of the position of the means to relieve the braking action. accumulators. They may then be calibrated in paratus, it may sometimes be necessary to drive To this end 20 I provide an ordinary thruster 52b, located under the desired tension units. , 20 It will be clear that my invention is not re an endof the scale beam 5!. This thruster may be of an ordinary type well known in the art, and stricted to the particular embodiments of ap special description thereof is not required. Its paratus which I have described in some detail. ' My invention as claimed'may be practiced with 25 upwardly, thereby relieving tension on the cables - other apparatus; and modi?cations in my inven 25 50, and it may be, and preferably is, actuated by /tion may be made without departing from the a hand control, since relief of the braking action spirit thereof. ' will be required only during threading operations. Having thus described my invention, what I The cradle 40. is ‘shown as comprising side claim as new and desire to secure by Letters Patent, is: 30 30 pieces 4b and'transverse members 53 and 54. function is to push the free end of the scale beam The cylinder ill has a plunger assembly Illa, terminating in a yoke I 0b. This yoke is con nected by rods Me to the cross piece 53. Below the cylinder assembly a stop means 55 may be 35 provided, which may be resilient or not as de ‘ 1. In combination, a mill, coilers on each side .of said mill, said coilers having drums and said drums being movable toward or away from said mill, drivers and braking means for each of said drums and means for urging said drums away 85 sired. Further details of the coiling devices are shown in Figs. 5 and 6, where it will be seen that the drum 3 has bearing members 56 and from said mill under predetermined forces, and means for varying said forces inversely to each 40 51, which are in the form of sheaves or rollers of said mill, said coilers having drums and said drums being movable toward or‘ away from said mill, drivers and braking means for each of said drums and means for urging said dmms away permitting motion of the drum along the cradle other as the direction of rolling is changed. ' 2. In combination, a vmill, coilers on each side members 4b when it is desired to remove the drum for loading or rewinding purposes. Suit able anti-friction bearing means are located be ' from said mill under predetermined forces, means for varying said forces inversely to each 45 45 tween the sheave members and the shafts of the drum. The splined shaft 41 from the drive other as the direction of rolling is changed, said urging means comprising ?uid cylinders and said is connected to the drum shaft by a slidable con necting member 58. To connect and disconnect variable means comprising adjustable accumu the drum from the shaft 47, I provide a power lators. ' '3. In combination, a mill, coilers on each side 50 means to operate the slidable connecting mem ber. ' This comprises a pressure cylinder 59, arms of said mill, said coilers having drums and said 50 connected to the piston thereof and also to drums being movable toward or away from said mill, drivers and braking means for eachof said drums and means for urging said drums away the connecting member 58. The arms are ?nally connected to the frame of the coiler by a 55 linkage 6| forming a moving fulcrum therefor. Latch means 62 may be provided to prevent ac‘ from said mill under predetermined forces, means for varying said‘ forces inversely to each other as the direction of rolling is changed, said crook of the coiler. _ urging means comprising '?uid cylinders and said variable means comprising adjustable ac An exemplary form of my variable accumula cumulators, each of said accumulators com 60 tor is shown in Figs. '7 and 8. 63 represents the frame of the apparatus. The cylinder is again prising a cylinder, a piston, and weight means shown at 25 and the trunnions at 26. Segmental exerting force on said piston, said cylinder being tiltable to vary said force. gear wheels 64 on the trunnions mesh with pin ions 65 on a shaft 66 iournaled in frame exten 4. In combination, a mill,_coi1ers on each side 65 sions 63a. The shaft bears a gear 6'! which is of said mill, said coilers having drums and said connected by a change speed gearing arrange drums being movable toward or away from said ment indicated generally at 68 to a motor 69. mill, drivers and braking means for each of said The yoke is again indicated at 29 and the , drums and means for urging‘ said drums away external rods at 30 and 3|. In this particular from said mill under predetermined forces, 70 embodiment, ears ‘l0 and ‘II on the cylinder 25 means for varying said forces inversely to each bear wheels ‘I2 which serve as guides for the other as the direction of rolling is changed, and rods. The weights 33 are attached to the ends indexing means on said varying means to facili of the rods which are connected by a yoke 14. tate rapid settings thereof to predetermined Spring cushioning means ‘I3 are shown in the forces. cidental dislodgement of the drum from the 75 upper yoke. 5; In combination, a reversible mill for rolling 4 2,124,880 strip metal forwardly and backwardly, means on each side of said mill for exerting unequal tensioning forces on ‘said strip as it enters and as it leaves said mill, means for inversely varying the forces exerted by said last mentioned means as the direction of rolling is changed, whereby desired relationships between the forward and back tensions on the strip may be had in spite of reversals of said mill, means on each side of 10 said mill for making the forward and back ten sions independent of sporadic variations in elon 6. A processgof rolling strip under (tension which comprises rolling strip metal forwardly and backwardly in a reversible mill to reduce it to gauge, while exerting tensioning forces on said strip as it enters and. as it leaves said mill, 6 said forces being unequal whereby to establish a desired differential ‘of tension realtive to the mill pass, varying said forces inversely when the direction of rolling is reversed, taking up spo radic variations in elongation on each side of 10 said mill under forces which are unequal but which are constant during the operation of the gation produced by the mill so as to maintain said tensions constant during the operation of - mill in any given direction, whereby the ten said mill '_in any given direction, said means sions on the strip are rendered independent of 15 operativeto take up under constant forces said said sporadic variations, and varying said take 15 variations in elongation, and means for inverse up forces inversely when the direction of rolling ly varying the forces exerted by said last men is changed. tioned means as the direction of rolling is changed. ' EDWIN B. HUDSON.