US3355925A - System for dynamically adjusting the working roll separation in rolling mills - Google Patents

System for dynamically adjusting the working roll separation in rolling mills Download PDF

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Publication number
US3355925A
US3355925A US405749A US40574964A US3355925A US 3355925 A US3355925 A US 3355925A US 405749 A US405749 A US 405749A US 40574964 A US40574964 A US 40574964A US 3355925 A US3355925 A US 3355925A
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United States
Prior art keywords
working roll
wedge
bearing
frame
wedge member
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Expired - Lifetime
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US405749A
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English (en)
Inventor
Peter J Barnikel
Robert P Freedman
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General Dynamics Corp
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General Dynamics Corp
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Priority to US405749A priority Critical patent/US3355925A/en
Priority to DE19651427895 priority patent/DE1427895B2/de
Priority to ES0318732A priority patent/ES318732A1/es
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Publication of US3355925A publication Critical patent/US3355925A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
    • B21B31/30—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by wedges or their equivalent

Definitions

  • This invention relates to systems for controlling the separation of the working rolls in rolling mills during mill operation and, more particularly, to a new and improved dynamic roll separation adjusting system capable of very accurate roll adjustment at extremely rapid rates.
  • Another object of the invention is to provide a new and improved dynamic roll separation adjusting system which responds rapidly enough to permit complete automatic gauge regulation of the material being rolled in a single mill stand.
  • a further object of the invention is to provide an adjusting system of the above character which is simple and efiicient in operation, may be installed easily in conventional rolling mill stands, and is capable of providing highly accurate roll separation settings.
  • a rolling mill stand having a fixed frame and a pair of working rolls, one of which is adjustable relative to the other one in the plane of the working roll axes soas to vary the roll separation, a wedge member interposed between the adjustable roll and the stand frame, hydraulic piston means connected to the wedge member to impart motion thereto prependicularly to the direction of relative motion of the adjustable working roll, and a layer of polytetrafluoroethylene interposed between each of the wedge surfaces and the frame and the adjustable working roll, respectively.
  • the layer of polytetrafluoroethylene is in the form of a fabric made of fibers of polytetrafluoroethylene so as to withstand the extreme pressures generated in a rolling mill while providing almost ideal anti-friction characteristics.
  • the stand of the invention is preferably provided with two separate adjusting systems interposed between the stand frame and a bearing chock at each end of that backup roll which applies pressure to the adjustable working roll.
  • a backup wedge which is complementary to the movable wedge and a bearing plate, both having surfaces which coact with the movable wedge surfaces and both of which are provided with a removable insert plate upon which the layer of polytetrafluoroethylene is mounted.
  • guide members coated with a poly: tetratluoroethylene surface are provided to guide the backup wedge in its motion.
  • the hydraulic piston is linked to the wedge member by a tie rod which extends through a central opening in the piston and holds the piston against the adjacent end of the wedge member.
  • FIG. 1 is a side view of a rolling mill stand provided with a representative roll separation adjusting system according to the invention
  • FIG. 2 is an end view of the mill stand shown in FIG. 1, looking from the right-hand side of FIG. 1 and partly broken away;
  • FIG. 3 is an enlarged fragmentary view in longitudinal section, taken along the line 33 of FIG. 1 and looking in the direction of the arrows, illustrating the adjusting systern in greater detail;
  • FIG. 4 is a plan view, partly in section, taken along the line 4--4 of FIG. 3 and looking in the direction of the arrows.
  • a rolling mill stand in the typical embodiment of the invention illustrated in the drawings, includes a rigid frame 11 in which are mounted, as best seen in FIG. 2, a lower backup roll 12, a lower working roll 13, an upper working roll 14, and an upper backup roll 15, all of the usual type.
  • a lower backup roll 12 Within each side of the frame 11 the lower backup roll is supported in a lower bearing chock 16 (only one being visible in FIG. 2) and each side of the lower working roll is supported and guided in a smaller bearing chock 17 which fits into a corresponding opening in the chock 16.
  • each side of the frame the upper backup roll is supported in a bearing chock 18 and each side of the upper working roll 14 is guided by a small bearing chock 19 which is received in a corresponding opening in the chock 18, each of these bearing chocks being mounted for vertical sliding motion in the usual manner so as to permit adjustment of the working r-oll separation.
  • an electric screwdown system 20 is mounted at the top of the frame 11 in order to make any large scale separation adjustments which may be necessary before or between mill operations.
  • This system includes the usual drive motor 21 along with a reduction gear system 22, a worm gear 23, a splined screw 24 and a lubricated nut 25 above the upper backup roll bearing chock 18 at each side of the frame 11 and, in conventional apparatus, the screw 24 would hear through a breaker block directly upon the bearing chock 18.
  • a rapid response hydraulically actuated adjusting mechanism 26 is inserted between the screw 24 and the bearing chock 18 on one side of the frame 11 and an identical adjusting mechanism 26' is inserted between the screw 24' and the bearing chock 18' on the opposite side of the frame.
  • the rapid response adjusting mechanism 26 comprises a vertical support plate 27, on one side of which a horizontal rectangular frame 28 and two vertical reinforcing plates 29 and 30 are attached by welding, for example, the plates 29 and 30 being connected to the frame 28 by two horizontal plates 31 and 32.
  • a hydraulic cylinder 33 On the other side of the vertical plate 27 a hydraulic cylinder 33 includes a piston 34 attached to a hollow central shaft 35 which projects through both of the end Walls 36 and 37 of the cylinder.
  • a tie rod 38 extending through the central opening of the hollow shaft 35, has an enlarged head 39 hearing against one end of the shaft 35 through a thrust washer 40 and, at the other end of the shaft, the tie rod is threaded into a socket 41 connected by a neck portion to one end of a rectangular wedge member 42, the rim of the socket 41 engaging the shaft 35 through a spacer 43 and another thrust washer 44.
  • the cylinder 33 is arranged to receive hydraulic fluid on either side of the piston 34 through two conduits 45 and 46, as shown in FIG. 2, so as to be double acting with regard to the direction of control.
  • Hydraulic fluid is supplied to the conduits 45 and 46 from a conventional control unit 47 wherein fluid from a high pressure line 48 is supplied to one or the other of the conduits 45 and 46 by a conventional control valve (not shown) within the unit 47 in accordance With a control signal applied by a cable 49, the fluid being returned from the control unit through another conduit 50.
  • the hydraulic system including the conduits 45 and 46, the internal control valve in the unit 47, and the cylinder 33 are capable of handling hydraulic fluid at pressures up to about 4,000 psi. or higher.
  • a control system (not shown) which may be of the type described in the copending application of Freedman, Barnikel and Torrance, Serial No. 150,738 filed Nov. 7, 1961 and now Patent No. 3,197,986 entitled Control System for Rolling Mills is provided.
  • the working roll force required to attain a desired reduction in the thickness of the material is determined in advance of rolling from a variety of factors such as the thickness of the incoming material to be rolled, the temperature of the material, the tension of the strip of material entering and leaving the mill, the velocity of the material passing through the mill, etc.
  • a control signal obtained in that manner or in any other appropriate manner and corresponding to the change in force required to produce the desired thickness reduction is applied to the control unit 47 through the cable 43 so as to control the direction in which hydraulic fluid is applied to the cylinder 33.
  • the necessary force to be applied to each side of the backup roll and working roll may be determined separately and the systems '26 and 26' actuated separately, thereby enabling variations in temperature, incoming thickness, etc. which occur between one side of the mill and the other to be taken into account.
  • a linear potentiometer 52 is mounted at the side of the reinforcing plate 29, as shown in FIG. 4.
  • a potentiometer control rod 53 connected to the wedge 42 by an extension rod 54 moves with the wedge so as to cause the potentiometer 52 to produce in the cable 51 a control signal accurately representing the position of the wedge.
  • the Wedge position signal is used only to control the initial position of the wedge when the mill stand is being prepared for operation. If desired, however, in other methods of oper-- ation, the signal from the potentiometer 52 will be com-- pared with a desired wedge position signal to control the position of the wedge.
  • the adjusting system 26 is releasably attached to the screw 24 while permitting rotation of that screw, by a horizontal bearing plate 55 which is affixed to the top of the rectangular frame 28 and has a control circular recess 56 to receive a flange 57 at the lower end of the screw.
  • the flange 57 is retained by an inwardly projecting lip 58 which extends around one half of the periphery of the recss 56 and a locking plate 59, slidably mounted in the top bearing plate 55, which is movable toward and away from the screw 24 so as to be extendable over the opposite edge of the flange 57.
  • a lever 60 pivotally mounted on the top bearing plate 55 by a stud 61, is linked to the plate by a pin 62, and an actuating arm 63 slidable through an aperture in the support plate 27 is connected to the lever 60 at an elbow 64, as shown in FIG. 4.
  • a releasable locking member 65 is provided in the plate 27 to retain the actuating arm and the lever in the position corresponding to the closed position of the locking plate.
  • a backup wedge 66 is supported between the members of the rectangular frame 28 and a crossbar 67, retaining plates 68 being mounted on the crossbar 67 and the frame 28 to limit the downward travel of the backup wedge and retain it within the adjusting assembly.
  • a clearance hole 70 is provided in the backup wedge 66 to accommodate a pin 69 which projects from the top of the upper backup roll chock 18.
  • Teflon has been used in solid or sheet form to provide very low coeflicients of static and sliding friction, its tendency towards cold flow or plastic deformation makes it undesirable as a bearing material for unit loads exceeding about 3,000 p.s.i.
  • polytetrafluoroethylene fibers are many times that of the solid or sheet form of the material.
  • polytetrafiuoroethylene fibers are woven into a fabric they form a surface having the lubricating properties of solid polytetrafluoroethylene but capable of withstanding loads of more than 20,000 p.s.i. without cold flow.
  • One form of fabric which may be used for this purpose comprises a composite weave of polytetrafluoroethyh ene fibers with other fibers as described in the United States Patent to White No. 2,804,886. It has been found, however, as described in the copending application of Edward Hobaica, Serial No.
  • the polytetrafluoroethylene material may be held in a metallic matrix of the type described, for example, in United States patent to Love No. 2,798,005 or may consist of a filled polytetrafluoroethylene sheet of the type sold by the Dixon Corporation of Buffalo, Rhode Island under the trade name Rulon, in order to form the antifriction layer.
  • both the bearing plate 55 and the backup wedge 66 are provided with insert plates 71 and 72 respectively at the surfaces facing the wedge 42 and each of these plates has bonded to its outer surface a layer 73 and 74 respectively of the above-mentioned polyt-etrafluoroethylene fabric.
  • insert plates are retained in corresponding recesses in the bearing plate and the backup wedge by a plurality of set screws 75.
  • the crossbar 67 has mounted on the side adjacent to the backup wedge a guide shim 76 having a polytetrafiuoroethylene fabric bonded to its working surface in the manner previously described.
  • a signal representing any change in the force which is required to produce a desired reduction in the thickness of the material is applied through the cable 49 to the control unit 47.
  • the internal valve (not shown) in the control unit moves to supply hydraulic fluid from the line 48 to one or the other of the conduits 45 and 46 to move the piston 34 in the proper direction to reduce the difference between the actual force applied and the required force.
  • the wedge 42 moves to the left as viewed in FIG.
  • the backup wedge 66 drives the backup wedge 66 downwardly, thereby increasing the pressure applied by the working rolls 13 and 14 so as to reduce the thickness of the material being rolled, and, as the wedge moves to the right the pressure is reduced so that the thickness of the material is not decreased to as great an extent.
  • the roll separation adjusting system of the present invention is enabled to make roll separation adjustments at very high acceleration up to, for example 0.8 inch per second per second while controlling the separation very accurately, e.g., to less than three ten-thousandths of an inch.
  • the accelerations attainable with the piston and wedge arrangement of the present invention re not limited by the inertia of the components being driven and any reasonable acceleration may be provided.
  • conventional electrically driven screw controls are limited to about 0.1 inch per second per second maximum acceleration and the hydraulically actuated screws described in Patent No.
  • 2,961,- 901 are limited to about 0.3 inch per second per second maximum acceleration by the system inertias.
  • the inertias of a comparable wedge adjusting system of the present invention, a hydraulically driven screw system, and an electrically driven screw system are in the ratios of one to one hundred to one hundred thousand.
  • the coefficient of friction of the polytetrafluoroethylene antifriction layer utilized in the present invention varies with the velocity of the wedge in such a way as to approach true viscous damping, which is highly desirable in high speed servo mechanisms.
  • Exemplary of the high performance capabilities of the adjusting system of the present invention is the fact that an adjusting system of the type described herein, subjected to a total load of over two million pounds and a pressure in the range of 5,000 to 10,000 p.s.i. on the polytetrafiuoroethylene bearing surfaces was operated with continuous adjustment motion at varying rates for over 1400 hours without failure, consistently providing accurate adjustments at accelerations far exceeding those attainable with conventional apparatus.
  • Apparatus for adjusting the working roll separation in a rolling mill including a frame and first and second relatively movable working rolls disposed within the frame comprising a wedge member having two surfaces disposed at an angle interposed between the frame and the first working roll and movable transversely therebetween so as to increase or decrease the force urging the first working roll toward the second working roll, a first bearing member linked to the mill frame and having a bearing surface coacting with one of the surfaces of the wedge member, a second bearing member linked to the first working roll and having a bearing surface coacting with the other surface of the wedge member, an antifriction layer including polytetrafiuoroethylene disposed between each of the surfaces of the wedge member and the coacting surfaces of the first and second bearing members respectively, and hydraulic drive means including a piston connected directly to the wedge member to impart said transverse motion thereto, including removable insert plates mounted in the first and second bearing members to provide the bearing surfaces thereof, and means affixing the layer including polytetrafiuoroethylene to each of the insert plates
  • Apparatus for adjusting the working roll separation in a rolling mill including a frame and first and second relatively movable working rolls disposed within the frame comprising a wedge member having two surfaces disposed at an angle interposed between the frame and the first working roll and movable transversely therebetween so as to increase or decrease the force urging the first working roll toward the second working roll, a first bearing member linked to the mill frame and having a bearing surface coacting with one of the surfaces of the wedge member, a second bearing member linked to the first working roll and having a bearing surface coacting with the other surface of the wedge member, an antifriction layer including polytetrafluoroethylen disposed between each of the surfaces of the wedge member and the coacting surfaces of the first and second bearing members respectively, and hydraulic drive means including a piston connected directly to the wedge member to impart said transverse motion thereto, including a hollow shaft on which the piston is mounted, and a tie rod extending through the hollow shaft and attached to the wedge member to hold one end of the shaft in rigid a
  • Apparatus for adjusting the working roll separation in a rolling mill including a frame and first and second relatively movable working rolls disposed within the frame comprising a wedge member having two surfaces disposed at an angle interposed between the frame and the first working roll and movable transversely therebetween so as to increase or decrease the force urging the first working roll toward the second working roll, a first bearing member linked to the mill frame and having a bearing surface coacting with one of the surfaces of the Wedge member, a second bearing member linked to the first working roll and having a bearing surface coacting with the other surface of the wedge member, an antifriction layer including polytetrafluoroethylene disposed between each of the surfaces of the wedge member and the coacting surfaces of the first and second bearing members respectively, and hydraulic drive means including a piston connected directly to the wedge member to impart said transverse motion thereto, wherein the second bearing member is wedge-shaped to complement the shape of the wedge member, and including support means supporting the second bearing member for motion perpendicular to the transverse motion of the wedge member
  • Apparatus for adjusting the working roll separation in a rolling mill including a frame and first and second relatively movable Working rolls disposed within the frame comprising a wedge member having two surfaces disposed at an angle interposed between the frame and the first working roll and movable transversely therebetw-een so as to increase or decrease the force urging the first working roll toward the second Working roll, a first bearing member linked to the mill frame and having a bearing surface coacting with one of the surfaces of the wedge member, a second bearing member linked to the first working roll and having a bearing surface coacting with the other surface of the wedge member, an antifriction layer including polytetrafluoroethylene disposed between each of the surfaces of the wedge member and the coacting surfaces of the first and second bearing members respectively, and hydraulic drive means including a piston connected directly to the wedge member to impart said transverse motion thereto, including screw leans mounted in the mill frame and having a movable end to provide large scale adjustments in the Working roll separation and locking plate means releasably locking the
  • a rolling mill comprising a mill frame, first and second relatively movable working rolls disposed within the frame, and a pair of adjusting means interposed between the frame and each end of one of the working rolls, respectively, each adjusting means comprising a Wedge member having two surfaces disposed at an angle interposed bctween the frame and the first Working roll and movable transversely therebetween so as to increase or decrease the force urging the first working roll toward the second working roll, a first bearing member linked to the mill frame and having a bearing surface coacting with one of the surfaces of the wedge member, a second bearing member linked to the first Working roll and having a bearing surface coacting with the other surface of the wedge member, an antifriction layer including polytetratluoroethylene disposed between each of the surfaces of the wedge member and the coacting surfaces of the first and second bearing members respectively, and hydraulic drive means including a piston connected directly and rigidly to the wedge member to impart said transverse motion thereto.
  • each of the first and second bearing members has a removable insert plate to provide the bearing surface thereof and wherein the layer including polytetrafinoroethylene comprises a fabric including fibers of polytetrafiuoroethylene bonded to each of the insert plates.
  • each of the adjusting means includes a hollow shaft on which the piston is mounted and a tie rod extending through the hollow shaft and attached to the wedge member to hold one end of the shaft in rigid abutment with the wedge member but permit positional adjustments in the plane of abutment.
  • each adjusting means includes support means supporting the second bearing member for motion perpendicular to the transverse motion of the Wedge member and guide means in the support means having a polytetrafiuoroethylene surface to provide lateral support for the second bearing member While permitting said perpendicular motion thereof.
  • a rolling mill according to claim 8 including a pair of screws mounted in the mill frame each having a movable end directed toward a corresponding end of the first Working roll to provide large scale adjustments in the Working roll separation, and locking plate means in each adjusting means releasably locking the first bearing member of the adjusting means to the movable end of the corresponding screw to provide said link to the mill frame.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Metal Rolling (AREA)
US405749A 1964-10-22 1964-10-22 System for dynamically adjusting the working roll separation in rolling mills Expired - Lifetime US3355925A (en)

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Application Number Priority Date Filing Date Title
US405749A US3355925A (en) 1964-10-22 1964-10-22 System for dynamically adjusting the working roll separation in rolling mills
DE19651427895 DE1427895B2 (de) 1964-10-22 1965-10-19 Vorrichtung zum Einstellen des Walzenspaltes während des Betriebs eines Walzwerkes
ES0318732A ES318732A1 (es) 1964-10-22 1965-10-21 Un aparato para ajustar la separacion de los rodillos de trabajo de un tren de laminacion.

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US405749A US3355925A (en) 1964-10-22 1964-10-22 System for dynamically adjusting the working roll separation in rolling mills

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479854A (en) * 1966-05-16 1969-11-25 Davy & United Eng Co Ltd Rolling mills
US3517531A (en) * 1967-11-03 1970-06-30 Gulf & Western Ind Prod Co Rolling mill gage control actuator system
US3596488A (en) * 1967-10-13 1971-08-03 Davy & United Eng Co Ltd Rolling mills
US5038591A (en) * 1988-01-14 1991-08-13 Hitachi, Ltd. Rolling mill and rolling mill method
US20150306647A1 (en) * 2014-04-25 2015-10-29 Kepco Nuclear Fuel Co., Ltd. Gap control device for pilger die assembly of cold pilger mills

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1821483A (en) * 1929-11-25 1931-09-01 Barton R Shover Rolling mill
US2798005A (en) * 1951-10-19 1957-07-02 Glacier Co Ltd Porous metal bearing containing polytetrafluoroethylene and a solid lubricant
US2804886A (en) * 1955-11-04 1957-09-03 Charles S White Low friction fabric material
US3081644A (en) * 1959-10-05 1963-03-19 Gemmer Mfg Co Close tolerance anti-friction component assembly
US3197086A (en) * 1962-10-01 1965-07-27 Raddysh Peter Combination bottle and cap attached element usable as a dispenser

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1821483A (en) * 1929-11-25 1931-09-01 Barton R Shover Rolling mill
US2798005A (en) * 1951-10-19 1957-07-02 Glacier Co Ltd Porous metal bearing containing polytetrafluoroethylene and a solid lubricant
US2804886A (en) * 1955-11-04 1957-09-03 Charles S White Low friction fabric material
US3081644A (en) * 1959-10-05 1963-03-19 Gemmer Mfg Co Close tolerance anti-friction component assembly
US3197086A (en) * 1962-10-01 1965-07-27 Raddysh Peter Combination bottle and cap attached element usable as a dispenser

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479854A (en) * 1966-05-16 1969-11-25 Davy & United Eng Co Ltd Rolling mills
US3596488A (en) * 1967-10-13 1971-08-03 Davy & United Eng Co Ltd Rolling mills
US3517531A (en) * 1967-11-03 1970-06-30 Gulf & Western Ind Prod Co Rolling mill gage control actuator system
US5038591A (en) * 1988-01-14 1991-08-13 Hitachi, Ltd. Rolling mill and rolling mill method
US20150306647A1 (en) * 2014-04-25 2015-10-29 Kepco Nuclear Fuel Co., Ltd. Gap control device for pilger die assembly of cold pilger mills
US9724739B2 (en) * 2014-04-25 2017-08-08 Kepco Nuclear Fuel Co., Ltd. Gap control device for pilger die assembly of cold pilger mills

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Publication number Publication date
DE1427895B2 (de) 1970-05-06
DE1427895A1 (de) 1968-10-24
ES318732A1 (es) 1966-07-01

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