US3561241A - Rolling mill for thin strips - Google Patents

Rolling mill for thin strips Download PDF

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Publication number
US3561241A
US3561241A US806218A US3561241DA US3561241A US 3561241 A US3561241 A US 3561241A US 806218 A US806218 A US 806218A US 3561241D A US3561241D A US 3561241DA US 3561241 A US3561241 A US 3561241A
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US
United States
Prior art keywords
roll
trough
recess
rolling
working roll
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Expired - Lifetime
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US806218A
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English (en)
Inventor
Paul Blain
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Institut de Recherches de la Siderurgie Francaise IRSID
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Institut de Recherches de la Siderurgie Francaise IRSID
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Publication of US3561241A publication Critical patent/US3561241A/en
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F16C13/02—Bearings
    • F16C13/04—Bearings with only partial enclosure of the member to be borne; Bearings with local support at two or more points
    • 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
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/06—Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials
    • F16C27/063—Sliding contact bearings

Definitions

  • This invention relates to rolling mills, and particularly to an improved compensating mechanism for preventing defects in metal strips due to the effects of the rolling pressure on the rolls.
  • the primary object of the instant invention is the provision of a compensating arrangement for a strip rolling mill which practically distributes the pressure uniformly over the operating length of the rolls, yet is simple in its structure, and capable of maintenance-free operation over an extended period of time.
  • the invention provides a practically rigid receptacle with a recess in which a cushion of solid material is conformingly received, which transmits pressures hydrostatically over the operating length of the roll, the material being either elastomeric or semi-fluid.
  • a pressure transmitting member engages the cushion in the recess of the receptacle and substantially completely blocks the open side of the recess. It moves inwardly and outwardly of the recess through the open side of the latter and has a concavely arcuate face directed outwardly of the recess and constituting a trough. An axial portion of one of the working rolls or backingup rolls of the mill is conformingly received in the trough.
  • FIG. l shows a rolling mill equipped with the compensating device of the invention in fragmentary, frontelevational view
  • FIGS'. 2 and 3 respectively show the mill of FIG. 1 in side elevational section on the lines II-II and III-III;
  • FIGS. 4 and 5 show modifications of the mill of FIG. l in corresponding views
  • FIG. 6 shows yet another modified mill according to this invention in a view corresponding to those of FIGS. 2 and 3;
  • FIG. 7 illustrates a further modified mill in fragmentary side elevation, and partly in section.
  • FIGS. 1 to3 there is shown only as much of an otherwise conventional rolling mill for very thin strip as is needed for an understanding of this invention.
  • Only the bottom working roll 1 of the mill is seen in FIG. 1.
  • It is a cylindrical body of steel without necks that is conformingly received over the lower third of its circumference in a relatively thin-Walled trough 2 of fiber-reinforced plastic.
  • This material is commonly used in rolling mill plants.
  • the trough 2 is a circumferential segment of a hollow cylinder whose axial edges are enlarged for greater stiffness.
  • the trough 2 is backed by a molded rubber cushion 3 and practically completely blocks the open side of a recess in a heavy metal base 4 which provides a conforming receptacle for the rubber cushion.
  • the trough 2 transmits the rolling pressure from the roll l1 to the cushion 3 and may move inwardly of the recess in the receptacle 4 under the rolling pressure, thereby compressing the nubber cushion 3 which is much softer and more resilient not only than the receptacle 4, but also than the pressure transmitting trough 2.
  • the rubber chosen for the cushion 3 is of such hardness that it will distribute the rolling pressure substantially uniformly like a non-compressible liquid over all walls of the cavity in the receptacle 4 and the trough 2 while lacking the fluidity of a liquid which would make it impractical to confine the cushion in the manner required for its continued operativeness.
  • the pressure in the rubber or elastomer, resulting from the forces exerted on the roll, is distributed uniformly over its entire volume, and the reaction on the roll is accordingly exactly the same over the entire working length of the roll.
  • the pressure exerted on the strip is consequently substantially the same over the entire width of the srtip Whatever may be the extent of yielding in various pieces. It can easily be seen that it is possible in this Way to obtain a uniform reduction of thickness of the rolled product over its entire Width.
  • the bottom working roll k1 cooperates with a top Working roll 7 of greater diameter during the rolling of a strip in a known manner, as is indicated in FIG. 2.
  • the top working roll 7 is driven in a conventional manner, not shown.
  • the compensating device of the invention is equally the friction, in particular on starting up, between the roll and the trough is too great.
  • the roll 8 is partly received in a plastic trough 2 having integral radial anges of which only one is seen in FIG. 4.
  • the trough 2' is made of one piece, having a semicircular opening 10 to permit the passage of the neck 9. The remaining pieces have been given the same references as in the preceding figure.
  • the compensating device of the invention may be limited to a portion of a roll approximately equidistant from the two axial ends of the roll, as is shown in FIG. 5. It can be seeen that, in this arrangement, the cushion 3 takes up in length only exactly the width of the rolled strip 12. The rolling pressure will be uniformly distributed over the entire width of the strip and the strip will receive a constant reduction in thickness. As the roll is not subjected to stresses at the ends it cannot yield in ⁇ a damaging way. At 13a and 13b openings made in the base 4 are shown which allow the ends of the roll to pass through.
  • the portions of the roll 11 not directly subjected to the rolling pressure are not backed by the cushion 3, and do not need such backing.
  • the ends of the roll, not themselves seen in FIG. 4, may or may not be equipped with necks, and the roll may or may not be driven, as it is evident from FIGS. 1 and 4 respectively.
  • the rolling pressure need not be transmitted directly by a trough from a working roll to a rubber cushion, as has been shown in FIGS. 1 to 5, but a backing-up roll may be interposed between the working roll and one or more rubber cushions.
  • FIG. 6 partly illustrates a rolling mill in which a bottom working roll 14 and a larger top working roll 15 shape a strip 16 therebetween, the bottom working roll being mounted on two backing-up rolls 17, 18.
  • the rolling pressure is transmitted from the backing-up rolls to respective rubber cushions 3a, 3b in recesses of a common metal base 4a by respective plastic troughs 2a, 2b in the same manner as described hereinabove.
  • This arrangement could be preferred in cases when the wear on the rolls in contact with the trough would be heavy and could mark the sheet.
  • the trough which transits rolling pressure from the rolls of the mill to a confined rubber cushion may be made of any relatively rigid material having a low coefficient of friction in contact with the metal that is being rolled, and it need not necessarily be as thin-walled as has been shown in FIGS. 1 to 6.
  • FIG. 7 shows a bottom working roll 1a which is supported on a pressure-transmitting, rectangular slab 19 of copper or copper-base alloy whose top face is hollowed out to form a trough.
  • a silver coating 20 about 2 millimeters thick, for instance a thin silver sheet properly brazed, covers the trough face which is approximately cylindrical about an axis perpendicular to the plane of FIG. 7.
  • the slab 19 is slidably received in a conforming recess of a rigid metal base 22 and blocks the open side of the recess, thereby conning a rubber cushion 21 in the same.
  • lubrication at the interface of the steel roll 1a and of the trough facing 20 is provided by water supplied through pipes 24 and controlled by spigots 25 which splash the water on the exposed surface of the roll 1a, two 'water supply systems being provided for clockwise and counter-clockwise rotation of the roll 1a respectively.
  • the viscosity of water and its ability of forming a continuous lubricant lm under pressure are inversely related to the water temperature, and it is, therefore, important to maintain the water lm at a temperaure as close to the freezing point as possible, in spite of the risk of said water being heated up by reason of the considerable pressure forces exerted by the system.
  • the copper slab 19 is, therefore, provided with two refrigerant ducts 26 connected to a mechanical refrigeration system, not itself shown, and normally filled with a fluorocarbon refrigerant during operation of the mill.
  • the ducts are received in elongated notches 27 formed in the bottom face of the slab y19, and closed after insertion of the ducts 26 by means of brazed-copper bars 28.
  • the ducts 26 are angularly offset about 30 in opposite directionsfrom a vertical plane through the axis of curvature of the roll 1a, and axially elongated, radial depressions 29 in the trough face 20 of the slab 19 are radially aligned with the ducts 26.
  • the depressions 29 thus are colder than the remainder of the trough face, and the refrigerant in the ducts 26 is kept at a temperature low enough to cause the water in the depressions 29 to freeze. Cooling is therefore most effective in the lowermost portion 30 of the trough where the pressure is highest during rolling of a strip 31 between the bottom working roll 1a and a top working roll 32.
  • Rubber and other elastomeric materials such as synthetic rubbers and plasticized resin compositions more commonly thought of as plastics, are preferred cushion materials, but at least some of the advantages of the nvention can be achieved with cushions made of other soft or semi-fluid materials, such as stiff grease compositions whose viscosity is high enough so as not to create leakage problems.
  • the plastic troughs may be of synthetic resin, reinforced with textile fibers. This material, such as Celoron or Textolite, is commonly used in rolling mill plants for making the roll neck bushings.
  • said member being movable inward and outward of said recess through said open side, and having a concavely arcuate face directed outwardly of said recess,
  • said pressure transmitting member essentially consisting of reinforced plastic or metal.
  • said pressure transmitting member essentially consisting of metal
  • said compensating means further comprising means for maintaining a lm of liquid lubricant between said pressure transmitting member and said one roll, and cooling means in thermal contact with said pressure transmitting member for controlling the temperature of said ilm.
  • said pressure transmitting member mainly consisting of copper, said face thereof essentially consisting of silver, said one roll consisting of steel, and said cooling means including a refrigerantduct in said pressure transmitting member.
  • said face of the pressure transmitting member being formed with a depression therein aligned with said duct.
  • said means for maintaining a iilm of liquid lubricant including a supply of Water, and means for controlling the application of said water to the surface of said one roll.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Sliding-Contact Bearings (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US806218A 1968-03-13 1969-03-11 Rolling mill for thin strips Expired - Lifetime US3561241A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR143520 1968-03-13
FR6903583A FR2031967A5 (enrdf_load_stackoverflow) 1968-03-13 1969-02-14

Publications (1)

Publication Number Publication Date
US3561241A true US3561241A (en) 1971-02-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
US806218A Expired - Lifetime US3561241A (en) 1968-03-13 1969-03-11 Rolling mill for thin strips

Country Status (7)

Country Link
US (1) US3561241A (enrdf_load_stackoverflow)
BE (1) BE729647A (enrdf_load_stackoverflow)
DE (1) DE1912442A1 (enrdf_load_stackoverflow)
FR (2) FR1572272A (enrdf_load_stackoverflow)
GB (1) GB1239324A (enrdf_load_stackoverflow)
LU (1) LU58165A1 (enrdf_load_stackoverflow)
SE (1) SE345981B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702558A (en) * 1971-09-09 1972-11-14 Niagara Machine & Tool Works Deflection compensating press brake die support
US3762202A (en) * 1971-10-18 1973-10-02 W Sherwood Rolling mill for flat-rolled products
US3828599A (en) * 1971-11-09 1974-08-13 Prod Machinery Corp Apparatus and method for leveling metal strip
US4218907A (en) * 1979-01-31 1980-08-26 Kennecott Copper Corporation Rolling mill bearing assembly
US4768366A (en) * 1987-04-30 1988-09-06 Tadeusz Sendzimir Wide strip mill using pressure elements
WO2004031600A1 (de) * 2002-09-17 2004-04-15 Khd Humboldt Wedag Ag Gleitschuhlagerung für drehtrommeln wie z.b. für eine rohrmühle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1135049B (it) * 1980-01-25 1986-08-20 Escher Wyss Sa Cilindro con una superficie cilindrica da riscaldare o raffreddare

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702558A (en) * 1971-09-09 1972-11-14 Niagara Machine & Tool Works Deflection compensating press brake die support
US3762202A (en) * 1971-10-18 1973-10-02 W Sherwood Rolling mill for flat-rolled products
US3828599A (en) * 1971-11-09 1974-08-13 Prod Machinery Corp Apparatus and method for leveling metal strip
US4218907A (en) * 1979-01-31 1980-08-26 Kennecott Copper Corporation Rolling mill bearing assembly
US4768366A (en) * 1987-04-30 1988-09-06 Tadeusz Sendzimir Wide strip mill using pressure elements
WO2004031600A1 (de) * 2002-09-17 2004-04-15 Khd Humboldt Wedag Ag Gleitschuhlagerung für drehtrommeln wie z.b. für eine rohrmühle

Also Published As

Publication number Publication date
BE729647A (enrdf_load_stackoverflow) 1969-08-18
SE345981B (enrdf_load_stackoverflow) 1972-06-19
DE1912442A1 (de) 1969-11-06
FR2031967A5 (enrdf_load_stackoverflow) 1970-11-20
FR1572272A (enrdf_load_stackoverflow) 1969-06-27
LU58165A1 (enrdf_load_stackoverflow) 1969-07-09
GB1239324A (enrdf_load_stackoverflow) 1971-07-14

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