US3765212A - Compact rolling mill for metal strands - Google Patents

Compact rolling mill for metal strands Download PDF

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Publication number
US3765212A
US3765212A US00280249A US3765212DA US3765212A US 3765212 A US3765212 A US 3765212A US 00280249 A US00280249 A US 00280249A US 3765212D A US3765212D A US 3765212DA US 3765212 A US3765212 A US 3765212A
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United States
Prior art keywords
rolling mill
shafts
roller
accordance
mill
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Expired - Lifetime
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US00280249A
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English (en)
Inventor
J Moslener
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Mannesmann Demag AG
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Demag AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B21B35/14—Couplings, driving spindles, or spindle carriers specially adapted for, or specially arranged in, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/22—Hinged chocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B21B35/14—Couplings, driving spindles, or spindle carriers specially adapted for, or specially arranged in, metal-rolling mills
    • B21B35/142—Yielding spindle couplings; Universal joints for spindles
    • B21B35/143—Yielding spindle couplings; Universal joints for spindles having slidably-interengaging teeth, e.g. gear-type couplings

Definitions

  • ABSTRACT A compact, space-saving rolling mill structure for metal strands, which mill is arranged between a strand casting apparatus and a second rolling mill equipped with high or low speed rollers is disclosed herein,
  • the compact mill comprises a roller housing journaling rollers on hollow shafts which are driven through the output of angularly adjustable power transmission shafts.
  • the power shafts derive their input from hollow worm wheels.
  • Rolling speed increases with decreasing strand diameter and increasing strand length, thus, rolling mill structures must be adapted to the specific dimensions of the metal material to be rolled.
  • this adaptation can be achieved by interchanging the rollers.
  • the interchangeability of whole mill structures requires a special design of the mill drives.
  • unitary drives consisting of a motor and a gear are provided for each mill with the drives disposed perpendicular to the mill strand. This, of course, results in a considerable width of the mill line. Therefore, a mill building or a bay therein can usually house only one or perhaps two mill lines.
  • Such a drive design prohibits the design of a plant having several mill strands in one single building or bay.
  • Rolling mills with low-speed rollers immediately follow a strand casting apparatus.
  • the rollers run slowly, because their speed must be adapted to the speed of the casting process.
  • downstream high-speed rollers require a sufficient rolling pressure to mold the strand
  • upstream rolling structures i.e., those immediately following the strand casting apparatus, must possess the greatest rolling pressures.
  • the molding pressures for strand casting and the following rollers must be adjusted to the proper temperature distribution in the cast strand as well as to unspecified forces present in high-speed rolling which affect and propel the strand.
  • the economy of cast rolling may be increased considerably with a multiple strand plant in which individual strands run parallel and are spaced slightly apart. Therefore, lateral arrangements of the rolling mill structures and their drives should be space saving for optimum operation.
  • Rolling mills with high-speed rollers for handling several strands have very little lateral space to accommodate motors and driving elements, since the space required for the driving elements cannot be easily reduced. This difficulty manifests itself even more when low-speed rollers are arranged behind strand casting apparatus in multiple strand plants.
  • a method is known to make such a rolling mill structure more easily accessible, viz., part of its drive is arranged to be detachable from the foundation and the rest of the drive together with a frame is arranged to be lifted vertically from the foundation.
  • the saving of space in this kind of rolling mill design consists of the specific arrangement of the driving elements underneath the floor. of course, this driving element arrangement necessitates the removal of the rolling structure if maintenance personnel are to have access thereto. Furthermore, the arrangement of the driving element underneath the floor requires the installation of expensive, excavated foundations.
  • the alternating vertical/horizontal mill arrangement affects the exterior dimensions of the rolling structure in a certain unfavorable way.
  • the height of the vertical rolling structure determines the extension of a similar rolling structure in the horizontal plane and therefore determines the lateral spacing of several parallel strand lines.
  • Another known layout of rolling mill structure which is also provided with a driving element underneath the floor, incorporates driving elements located next to the roller housing.
  • a connection between the driving elements under the floor and the roller shafts is established by means of a bevel gear.
  • This arrangement requires a vertical driving shaft in the form of a spline shaft. Nevertheless, the access to the driving elements underneath the floor is still rather difficult.
  • the object of this invention is to provide a rolling mill structure for high speed and low speed rollers which has a very compact layout.
  • the new rolling mill structure is easily interchangeable in multiple strand wire and refined iron mill lines, as well as in strip and girder mill lines, and its compact design makes it suitable for use immediately downstream of a strand casting apparatus in multiple strand casting plants.
  • a futher objective of the invention is to design a compact rolling structure having an equally compact driving element which is not arranged under the plant floor and which also permits a compact, parallel arrangement of several rolling structures in a row for several parallel strands.
  • the new rolling structure is suitable for installation in vertical position (horizontal rollers) with respect to strand direction within a multiple strand plant.
  • the structure of the invention readily accommodates the required interchanging of rollers as well as the easy maintenance of the driving elements.
  • the invention provides for a separate roller housing and roller drive housing, each of which is independently removable and installable in the rolling struc ture.
  • the objectives are achieved by the provision of hollow rollers driven through corresponding hollow gears which are not involved in the start-up motion, and by the internal connection of each roller with each gear in the cavities thereof by means of flexible (angularly adjustable) shafts and universal joints.
  • this rolling structure is achieved by the interior arrangement of the driving shafts, whereby the driving gear can be brought extremely close to the roller housing.
  • the rollers as well as parts of the driving elements may be dismantled without having to move one of the two separate structural units, roller and driving gear housings, respectively.
  • the foundations for the new structures may be very simple and inexpensive. Should the removal of the roller structure be desired, it may be simply accomplished.
  • Driving elements are even more easily accessible with regard to the gear than in the above-mentioned sub-floor arrangements.
  • the driving gear is arranged next to the roller housing, while the driving motor is arranged within the remaining spaces between the strands to be rolled in a manner whereby its driving shaft is parallel to the strand axes.
  • the arrangement of the driving gear adjacent to the roller housing may be effected within an even smaller distance if the connection between roller and shaft from point of entry of the shaft is moved towards the interior of the cavity. If required, the driving shafts may be longer so that only small angular movements are necessary when driving the rollers.
  • the connection between roller and shaft or between gear and shaft is advantageously and desirably in the form of an arc gear coupling. If the deflection angle of the shaft axis with respect to the roller axis is sufficiently small, arc gear couplings are very durable.
  • the gear pinions are in hollow worm wheels and the tooth engagement planes of the worm wheels and the corresponding worms are parallel to the rolling strand axes.
  • the use of worm gears has a particular advantage made possible by the exterior roller diameter. If the exterior diameter of the worm wheel corresponds approximately to the exterior diameter of a roller, worm wheels may be readily accommodated, in contrast to the familiar bevel gears, in a narrow space running parallel to the lateral surface of the roller housing. The introduction of the torque from the motor in worm gears parallel to the strand direction presents a very favorable use of the available space between two adjacent rolling strands.
  • Worm gears may also be used favorably in an alternative embodiment of this invention in which the outer radius of the worm wheel is greater than half of the distance between the two axes, and the worm wheels are laterally offset and each worm wheel engages with a worm.
  • This arrangement is advantageous for the transmission of a driving torque for high rolling pressures.
  • this form of the invention aids in saving space, since the worm wheels designed for high torque transmission have a large circumference, which would ordinarily require a greater height within the gear box.
  • this arrangement accommodates a worm wheel diameter greater than the roller diameter.
  • gear pinions consisting of hollow, meshing spur gears, one of which is solidly connected with one coaxial worm wheel.
  • This layout requires only one worm gear, whereby even higher torque may be transmitted by a worm wheel with large diameter to the rollers through spur gears.
  • the spur gears provide the necessary synchronization and their diameters may be equal to the roller diameters, whereby the worm wheel diameter may be considerably larger than both the roller and spur gear diameters.
  • Axial movement of the shafts in the hollow gears and rollers is limited by alignment devices which ensure spherical support of the shafts within the rollers and gear pinions.
  • One especially desirable embodiment provides for connections inside the hollow gear pinions and/or rollers permitting two angular movements for shafts extending in opposite directions in the cavity.
  • the rolling structure according to the invention is therefore especially suitable for multiple strand mills or multiple strand casting plants.
  • the driving gear does not necessarily have to be attached to the roller housing in a vertical position.
  • the gear can also be constructed as a modular type structural unit which can be inserted into special guides and removed as well from guides which are provided for the units above the roller housing.
  • This type of arrangement is also very practical when used under the roller housing, although the latter arrangement is by no means the same as the abovedescribed arrangement of the driving element underneath the floor, because such a modular unit, after removal of the flexible shafts, may itself be removed without difficulty.
  • the drive unit is readily accessible. It is also possible to mount the driving motor to such a unit and to provide special connectors which permit the quick installation and removal of the units.
  • a motor with gear may be arranged ahead of each roller housing and the gear casing may be connected with the part of the roller housing accommodating the bearing.
  • FIG. 1 is a schematic, plan view of a casting-rolling plant having three strands
  • FIG. 2 is a schematic, side elevational view of one of the three strands showing a horizontal/vertical structural mill arrangement
  • FIG. 3 is a cross-sectional view of a rolling mill structure according to the invention (as a horizontal rolling structure);
  • FIG. 4 is a first alternate embodiment of drive gearing for the mill of FIG. 3;
  • FIG. 5 is a second alternate embodiment of drive gearing of the mill of FIG. 3.
  • FIG. 6 is a third alternate embodiment of the drive gearing of the mill of FIG. 3.
  • the rolling mill of the invention is shown in a multiple strand plant, in which multiple cast strands 1, 2 and 3 are shown leaving, in arrow direction, a strand casting device (not shown).
  • the strand casting device is of the usual sort and has a casting ladle from which the molten material is poured into a distributor from which it continues to flow in adjacent strand casting chills (not shown).
  • the thus formed metal strands 1-3 are further cooled and, as they leave the cooling line, they are introduced into the horizontal rolling mill structures 4, 5, and 6, of the invention, at
  • FIG. 1 also shows a starter mechanism in these rolling mills which is not part of the subject invention.
  • the driving elements for rolling mills 4-6 are driving mechanisms 10 and 11 located between the roller housings or pairs of supports 4a, 5a and 5a, 6a, respectively.
  • Driving motors 14 and 15 are connected to these driving mechanisms through driving shafts disposed along axes 12 and 13.
  • FIG. 2 shows, in side elevation, the vertical rolling mill 8 and the horizontal rolling mill 5.
  • the cast strand 2 to be rolled travels, in arrow direction, consecutively through rolling mills 5 and.8.
  • the start-up elements for the horizontal rolling mill 5 are not an object of this invention and are, therefore, not described in detail.
  • FIG. 2 shows the close succession of the horizontal rolling mill 5 and the vertical rolling mill 8.
  • the cast strand 2 (as well as cast strands 1 and 3) are basically enclosed by roller housings or supports 4a, 5a and 6a, as shown.
  • FIG. 3 shows the horizontal rolling structure 5 (identical to mills 4 and 6) in a cross-sectional view taken perpendicular to the axis of the mill strand 16, whereby the driving component 10 (motor is not shown) is indicated in cross section accordingly.
  • roller bearings 17 are provided for roller shafts 18.
  • the rollers are hollow and are, therefore, provided with cylindrical cavities 21.
  • Each cavity 21 may be continuous or it may be divided by diaphragms into individual sections, as long as the angular travel of shafts 22, 23 is accommodated.
  • Shafts 22, 23 are equipped with spur gear elements 25, and the cavities 21 of the rollers 19, are equipped with corresponding mating hollow gear teeth 26.
  • the shafts 22, 23 have spherical heads 27 at opposite ends which are limited axially by spherical stops 28, which stops 28 are integral with plugs 29 which cover the end cavity openings in the gears and rollers.
  • FIG. 3 clearly depicts an essential element of the invention, namely, that the cavity 21 facilities the con trolled transfer of heat coming from east strand 2 and going through the roller 19 and roller rim 19a, thereby contributing to the maintenance of the cavity 21 temperature at an appropriate and predetermined level. Thistmay be directly effected by heating the cavity with air or by providing a liquid cooling depending on the precise temperature required in the roller rim 19a.
  • the driving element 10 has a design, as shown in FIG. 3, with respect to the bearings for rollers 19, 20.
  • Shafts 22, 23 also form a power and form connected, i.e., universal coupling 24 of the type described previously.
  • the gear pinions 30, 31 are central, solidly connected parts of the worm wheels 32, 33. Both worm wheels are driven by a worm 34, on the axis of which is the drive shaft from the motor 14. It is advantageous that the worm 34 is also located on the horizontal axis 35 of strand 16. This position guarantees a small driving angle 36 of shafts 22, 23, respectively, towards the roller rotation axes 37. It will be understood and appreciated that the design of the rolling structures, in accordance with the invention, permits an extremely compact construction, particularly when the tooth engagement plane 38 of the worm wheels 32, 33 and the worm 34 is in a parallel relation with strand 16.
  • FIG. 4 shows the driving element 10 designed in a somewhat modified form from that shown in FIG. 3.
  • the driving element 10 and its housing 10a are again supported on a frame 39 to which roller support blocks 4a, 5a, and 6a are also secured.
  • the worm wheels 32, 33 are associated with worms 34a, 3412, respectively.
  • both engagement planes 38a and 38b are offset from the vertical centerline of the housing 10.
  • Worms 34a and 34b may be separately driven by small synchronized electric motors.
  • FIG. 5 shows a single worm 40 meshing with a worm wheel 41 which is attached solidly to a shaft 42 ofa hollow pinion 43.
  • the cavities 21 remain otherwise the same as previously described. It is characteristic that the universal couplings 24 for each of the shafts 22, 23 are disposed at the remote ends of the cavities in the rollers and driving gears in order to obtain the minimum drive angle 36 of shafts 22, 23.
  • FIG. 6 illustrates a most advantageous embodiment of the compact rolling structure of the invention.
  • the distance between roller drive 10 and the roller housing or blocks 5a, 5b is reduced to zero. Consequently, castings 10a of the driving element 10 are directly, rigidly attached to roller blocks 5a, 5b. This results in some remarkable advantages.
  • Shafts 22 and 23 may berelatively short. Despite the decreased length, a relatively small driving angle 36 is obtained.
  • the size of worm wheels 32, 33 may be virtually the same as or smaller than the diameters of the hollow rollers 19, 20.
  • the driving element 10 shown in FIG. 6 is particularly suitable for a rolling mill which is equipped with movable roller blocks 5a, 5b.
  • the worm gears are placed in separate casings 45a, 45b for separate attachment to the roller housing blocks 5a, 5b.
  • a rolling mill in accordance with claim 1, in which a. said universal coupling means (24) is disposed interiorly of each cavity (21) remotely of the point of entry of the shaft therein.
  • each of said worm wheels engages a separate worm 8 (34a, 34b).
  • said driving gear means include hollow, meshing spur gears (43, 44); b. one of said spur gears (43) is solidly connected with a single coaxial worm wheel (41); c. a worm (40) parallel with the axis of said strand 16 drives said worm wheel (41).
  • said shafts (22, 23) have spherical supports (27, 28) within said rollers (19,20) and within said gear means (30, 31; 32, 33; 43,44).
  • a. said coupling means (24) are disposed within said hollow gears (30, 31; 32, 33; 43, 44) and rollers (19, 20) to accommodate angular movements of said shafts (22, 23); b. said shafts (22, 23) extend between opposite ends of the cavities (21).
  • a. a motor with a gear (10) is arranged upstream of each roller pair (19, 20); b. a gear casing (45a, 45b) is connected with the part of the roller housing (5a, 5b) accommodating a bearing (17).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
  • Gear Transmission (AREA)
US00280249A 1971-10-27 1972-08-14 Compact rolling mill for metal strands Expired - Lifetime US3765212A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2153553A DE2153553A1 (de) 1971-10-27 1971-10-27 Walzgeruest fuer metallstraenge zur anordnung hinter einem mit schnellaufenden walzen versehenen walzgeruest oder mit langsamlaufenden walzen im anschluss an eine stranggiessvorrichtung

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US3765212A true US3765212A (en) 1973-10-16

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US00280249A Expired - Lifetime US3765212A (en) 1971-10-27 1972-08-14 Compact rolling mill for metal strands

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US (1) US3765212A (enrdf_load_stackoverflow)
JP (1) JPS5216464B2 (enrdf_load_stackoverflow)
DE (1) DE2153553A1 (enrdf_load_stackoverflow)
ES (1) ES407777A1 (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4785653A (en) * 1985-10-15 1988-11-22 Centro-Morgardshammar Ab Wire rod block
US4831858A (en) * 1987-01-30 1989-05-23 Fec Co., Ltd. Driving apparatus for vertical rolling mill
US4864838A (en) * 1986-08-14 1989-09-12 Sms Schloemann-Siemag Aktiengesellschaft Drive apparatus for the vertical rolls of a universal rolling mill stand
US6053022A (en) * 1998-09-14 2000-04-25 Morgan Construction Company Modular rolling mill
US6920774B1 (en) * 2002-10-16 2005-07-26 Machine Concepts, Inc. Drive system for multi-roll leveler
US20080196469A1 (en) * 2007-02-15 2008-08-21 Shore T Michael Modular rolling mill
US10363590B2 (en) 2015-03-19 2019-07-30 Machine Concepts, Inc. Shape correction leveler drive systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5448252U (enrdf_load_stackoverflow) * 1977-09-10 1979-04-04

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1694854A (en) * 1927-01-08 1928-12-11 Holmes Thomas Edmund Rolling mill
US2156584A (en) * 1936-04-18 1939-05-02 Benedetti Francesco De Roll mill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1694854A (en) * 1927-01-08 1928-12-11 Holmes Thomas Edmund Rolling mill
US2156584A (en) * 1936-04-18 1939-05-02 Benedetti Francesco De Roll mill

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4785653A (en) * 1985-10-15 1988-11-22 Centro-Morgardshammar Ab Wire rod block
US4864838A (en) * 1986-08-14 1989-09-12 Sms Schloemann-Siemag Aktiengesellschaft Drive apparatus for the vertical rolls of a universal rolling mill stand
US4831858A (en) * 1987-01-30 1989-05-23 Fec Co., Ltd. Driving apparatus for vertical rolling mill
US6053022A (en) * 1998-09-14 2000-04-25 Morgan Construction Company Modular rolling mill
US6920774B1 (en) * 2002-10-16 2005-07-26 Machine Concepts, Inc. Drive system for multi-roll leveler
US20080196469A1 (en) * 2007-02-15 2008-08-21 Shore T Michael Modular rolling mill
US7523632B2 (en) 2007-02-15 2009-04-28 Morgan Construction Company Modular rolling mill
US10363590B2 (en) 2015-03-19 2019-07-30 Machine Concepts, Inc. Shape correction leveler drive systems

Also Published As

Publication number Publication date
JPS4849628A (enrdf_load_stackoverflow) 1973-07-13
ES407777A1 (es) 1975-11-01
DE2153553A1 (de) 1973-05-10
JPS5216464B2 (enrdf_load_stackoverflow) 1977-05-10

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