US3592036A - Method and apparatus for pressing a rotating roll against a surface - Google Patents

Method and apparatus for pressing a rotating roll against a surface Download PDF

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Publication number
US3592036A
US3592036A US841949A US3592036DA US3592036A US 3592036 A US3592036 A US 3592036A US 841949 A US841949 A US 841949A US 3592036D A US3592036D A US 3592036DA US 3592036 A US3592036 A US 3592036A
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United States
Prior art keywords
cylinder
guide walls
liquid
recess
water
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Expired - Lifetime
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US841949A
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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 US3592036A publication Critical patent/US3592036A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • 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

Definitions

  • the present invention relates to a method and apparatus for uniformly pressing a rotating cylinder against a surface, such as a working roll in a rolling mill or a papermaking machine, a calender, etc.
  • Working cylinders of this type must be so supported that they effect a uniform and regular pressure against the surface of the workpiece along their entire length. More particularly, in rolling mills for extra-thin metal strips, such as steel strips of several hundredths of a millimeter thickness, the roll must exert a uniform pressure against the strip along its entire width during the entire rolling operation, despite flexure of the roll, if a truly flat and nondeformed strip is to be obtained.
  • This and other objects of this invention are accomplished by pressing the cylinder against the surface with a congealable liquid under pressure, and continuously cooling the space between the cylinder and the guide walls to congeal the liquid at least in this space.
  • the surface of the rotating cylinder glides over the congealed liquid whereby leakage of liquid between the cylinder and the guide walls is prevented.
  • the apparatus of the invention comprises guide walls for the cylinder and means for rotatably supporting the cylinder between the guide walls.
  • the guide walls and cylinder define a recess closed by the cylinder.
  • a source of liquid under pressure is connected to the recess for supplying the liquid under pressure to the recess and pressing the cylinder against the surface.
  • Means for cooling the liquid in the recess sufficiently congeals at least a portion of the liquid in the space between the guide walls and the cylinder to form a seal of congealed liquid in the space.
  • Such a system greatly facilitates the operation of a hydraulic support for working cylinders, such as otherwise conventional rolls in rolling mills.
  • a working roll of very small diameter must be pressed against the strip in a rigorously uniform manner.
  • the congealed liquid seals of this invention are very effective because the congealed liquid has a small friction coefficient with the metal in its solid state and because the hydraulic fluid used to press the roll against the strip serves itself as a seal in its congealed portions. Water has all the necessary properties for this purpose and is, therefore, preferred although other congealable liquids of like properties may obviously be used.
  • FIG. 1 is a transverse section of a support for a roll of a rolling mill for extra-thin metal strips according to one embodiment of this invention
  • FIG. 2 is a similar view ofanother embodiment
  • FIGS. 3 and 4 are longitudinal side elevations, partly in section, of the embodiments of FIGS. 1 and 2, respectively;
  • FIGS. 5 and 6 are sectional views similar to those of FIGS. 1 and 2 of two additional embodiments.
  • FIGS. 1 and 3 are partial views of a rolling mill for extra-thin metal strips, showing only those parts of the mills directly relevant to the present invention.
  • the strip 1 is inserted and rolled between the two working rolls 2 and 3, where between it is subjected to pressure to reduce its thickness.
  • the working roll 2 is supported freely movably in a direction transverse to the strip 1 so that it may be moved upwardly and pressed against roll 3 by a cushion of ice 4.
  • the axle of the working roll 3 is fixed and the diameter of this roll is far in excess of the diameter of roll 2.
  • the roll 3 may be considered as indeformable while the roll 2 is flexible and elastic, its diameter being small in respect to its length.
  • the diameter of roll 2 may be of the order of 30 to 50 mm. for a strip width of300 to 600 mm.
  • the ice cushion 4 fully and uniformly transmits to the working roll 2 the pressure of the congealable fluid delivered under pressure through conduits 5 and inlets 6 into the bottom of the recess defined between the guide walls 7a, 7b, the roll 2, and end walls 7c, 7d. Therefore, the pressure to which the roll 2 is subjected is uniform throughout its length and, therefore, along the entire width of the metal strip 1 which is being rolled. On the other hand, any pressures exerted by different points on the strip being worked are distributed over the entire mass of the ice cushion and the length of the roll.
  • the working roll 2 may eliminate all irregularities in the strip and exerts a uniform pressure distributed over its entire working generatrix, thus producing a uniform reduction in the thickness of the strip along its entire width and an entirely flat strip impossible or, at least very difficult to obtain by conventional systems.
  • the guide walls and 7b are mounted in rigid steel support 8 and their upper edges serve to guide the rotary roll 2 therebetween, the walls defining a recess whose top is closed by roll 2.
  • the guide walls are made of a good thermal conductor material such as aluminum or copper. Copper is preferred.
  • the guide walls are strongly held in the support 8 which, in turn, is carried by a beam 9 which forms part of the amount for the cage of the rolling mill.
  • the working roll 3 is pressed against the strip 1 by any conventional means exerting pressure on the bearings for the roll (not shown), none of this structure forming part of the present invention.
  • Cooling means for the liquid in the recess is provided in the guide walls 70, 7b for the constant removal of heat from the liquid or ice in cushion 4.
  • the illustrated cooling means consists of a series of conduits 10a, 10b, in contact with the copper linings 7a, 7b.
  • a refrigerant fluid such as Freon (dichlorodifluoromethane)
  • Freon diichlorodifluoromethane
  • the entire cooling system is protected from external heat by an insulating cover ll disposed about steel support 8.
  • a further insulation is provided by a Teflon lining 12 between the copper guide walls 7a, 7b and their support 8.
  • Water is pumped into the recess between the walls 7a, 7b through conduits under a pressure of 100 to 300 bars, and is distributed in the recess through the ports 6 at the bottom of the recess.
  • the water in the recess is cooled to ice and this ice cushion is pressed uniformly against the roll 2 under the pressure of the water coming up through inlet ports 6.
  • the cooling may be so controlled that almost all the water in the recess is congealed into an ice cushion, leaving only a little liquid water at the bottom of the recess near the inlets 6.
  • the water is pumped into conduits 5 at a temperature slightly above its freezing temperature at the operation pressure. This temperature is a little below 0 C.
  • the water may be cooled in a heat exchanger (not shown) before it is pumped into the present apparatus.
  • the water consumed corresponds to the ice liquefied by the friction of the small roll 2 and the pressure it exerts upon the ice cushion.
  • FIGS. 2 and 4 like parts functioning in a like manner are indicated by the same reference numerals as in FIGS. 1 and 3 to avoid redundancy in the description.
  • the refrigerant circulating conduits 13a, 13b in the guide walls cool only the upper portions of these walls, the lower portions of the walls being cooled only by heat transfer through the copper. Accordingly, only the spaces 40 and 4b directly adjacent the roll 2 and the guide walls will be cooled sufficiently to form ice seals in these spaces.
  • the lower portions of the recess will be filled with water at slightly higher temperature so that the lower portion of the roll 2 will be in contact with liquid water, rather than ice.
  • this type of water-and-ice cushion for roll 2 will function similarly to the one previously described but it has certain advantages thereover, particularly if a great deal of heat must be removed from the water to congeal portions thereof, which happens particularly at high-rolling speeds. In this case, the mass of ice to be maintained is much smaller so that it is not necessary to increase the refrigerant circulation prohibitively.
  • the small roll 2 has no bearings. It is rotated by the movement of the strip 1 and guided entirely by the ice cushion 4 between the guide walls 7a, 7b. It is cooled by cooled copper end walls 7c, 7d which are connected to walls 7a, 7b. If desired, the end walls may be separately cooled in the same manner as the guide walls, or they are cooled merely by connection to the walls 7a, 7b by virtue oftheir high-thermal conductivity.
  • FIG. 4 differs from that of FIG. 3 in that the roll 2 is supported on trunnions l4 mounted in bearing slots in support 8 for movement in relation to strip II.
  • FIGS. 5 and 6 like parts functioning in a like manner have again been designated by the same reference numerals.
  • the embodiment of FIG. 5 is particularly useful for working rolls 2 of a relatively large diameter.
  • the entire cushion 4 in contact wit the roll 2 is congealed.
  • a refrigerant conduit of triangular cross section traverses the recess to divide its lower portion into two branches 41c and dd.
  • Each of these branches is supplied with water by a series of inlet ports 6a and 6b receiving water under pressure from conduits 5a and 527, respectively.
  • the same refrigerant as is used for cooling walls 70, 7b may be circulated through conduit 15, thus assuring freezing of the water in the center of the cushion as well as along the guide walls.
  • the lower portion of the cushion is constricted.
  • the cooling effect of the cold guide walls rapidly solidifies the water in the axial zone.
  • a film of water is introduced between the cushion and the lateral guide walls in the region where the walls are inclined, and this film of water is instantly solidified as it contacts the cold walls.
  • a method of uniformly pressing a rotating cylinder against the surface of a workpiece, the cylinder being rotated between guide walls comprising the steps of pressing the cylinder against the surface with a congealable liquid under pressure, and continuously cooling the space between the cylinder and the guide walls to congeal the liquid at least in said space, the surface of the rotating cylinder gliding over the congealed liquid whereby leakage of liquid between the cylinder and the guide walls is prevented.
  • An apparatus for uniformly pressing a rotating cylinder against the surface of a workpiece comprising guide walls for the cylinder of the type of rolls or calenders, means for rotatably supporting the cylinder between the guide walls, a. the guide walls and cylinder defining a recess closed by the cylinder,
  • cooling means comprises conduits in the guide walls for circulating a cooling medium therethrough.
  • the guide walls include a lining of a good thermal conductor material, the circulating conduits being provided in said lining.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Metal Rolling (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US841949A 1968-07-23 1969-07-15 Method and apparatus for pressing a rotating roll against a surface Expired - Lifetime US3592036A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR160174 1968-07-23

Publications (1)

Publication Number Publication Date
US3592036A true US3592036A (en) 1971-07-13

Family

ID=8652898

Family Applications (1)

Application Number Title Priority Date Filing Date
US841949A Expired - Lifetime US3592036A (en) 1968-07-23 1969-07-15 Method and apparatus for pressing a rotating roll against a surface

Country Status (7)

Country Link
US (1) US3592036A (xx)
BE (1) BE736449A (xx)
DE (1) DE1934726C3 (xx)
FR (1) FR1586138A (xx)
GB (1) GB1270169A (xx)
LU (1) LU59057A1 (xx)
SE (1) SE342274B (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762202A (en) * 1971-10-18 1973-10-02 W Sherwood Rolling mill for flat-rolled products
US6138559A (en) * 1996-11-02 2000-10-31 Zimmer; Johannes Machining device for striplike material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH587688A5 (xx) * 1975-02-13 1977-05-13 Escher Wyss Ag

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031872A (en) * 1958-09-16 1962-05-01 Textilmaschinen Eduard Kusters Fluid pressure roll
US3120174A (en) * 1962-08-09 1964-02-04 Valley Iron Works Corp Apparatus for resisting roll deflection
US3146160A (en) * 1960-08-01 1964-08-25 Beloit Iron Works Roll with adjustable deflection means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031872A (en) * 1958-09-16 1962-05-01 Textilmaschinen Eduard Kusters Fluid pressure roll
US3146160A (en) * 1960-08-01 1964-08-25 Beloit Iron Works Roll with adjustable deflection means
US3120174A (en) * 1962-08-09 1964-02-04 Valley Iron Works Corp Apparatus for resisting roll deflection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762202A (en) * 1971-10-18 1973-10-02 W Sherwood Rolling mill for flat-rolled products
US6138559A (en) * 1996-11-02 2000-10-31 Zimmer; Johannes Machining device for striplike material

Also Published As

Publication number Publication date
LU59057A1 (xx) 1969-11-18
DE1934726C3 (de) 1975-01-02
FR1586138A (xx) 1970-02-13
DE1934726A1 (de) 1970-01-29
BE736449A (xx) 1969-12-31
GB1270169A (en) 1972-04-12
SE342274B (xx) 1972-01-31
DE1934726B2 (de) 1974-05-30

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