EP1398089B1 - Pressure device for rolling mill - Google Patents

Pressure device for rolling mill Download PDF

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Publication number
EP1398089B1
EP1398089B1 EP01274224A EP01274224A EP1398089B1 EP 1398089 B1 EP1398089 B1 EP 1398089B1 EP 01274224 A EP01274224 A EP 01274224A EP 01274224 A EP01274224 A EP 01274224A EP 1398089 B1 EP1398089 B1 EP 1398089B1
Authority
EP
European Patent Office
Prior art keywords
rolling
stand
screwdown
rolling mill
chuck
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01274224A
Other languages
German (de)
French (fr)
Other versions
EP1398089A1 (en
EP1398089A4 (en
Inventor
Alexandr Alexandrovich Stepanov
Lev Georgievich Deljusto
Viktor Ivanovich Abramenko
Gennady Leonidovich Kochi
Alexandr Viktorovich Artjushechkin
Alexandr Mikhailovich Sorokin
Vladislav Petrovich Naumchenko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Borovichsky Kombinat Ogneuporov OAO
Severstal PAO
Original Assignee
Borovichsky Kombinat Ogneuporov OAO
Severstal PAO
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Borovichsky Kombinat Ogneuporov OAO, Severstal PAO filed Critical Borovichsky Kombinat Ogneuporov OAO
Publication of EP1398089A1 publication Critical patent/EP1398089A1/en
Publication of EP1398089A4 publication Critical patent/EP1398089A4/en
Application granted granted Critical
Publication of EP1398089B1 publication Critical patent/EP1398089B1/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
    • 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

Definitions

  • the invention relates to rolling and can be used in rolling sectional and sheet steels, non-ferrous and non-metal materials.
  • a disadvantage of the screwdown mechanism of a conventional stand is a low speed and accuracy of adjusting a clearance between rolls.
  • the travel speed of housing screws in the QUARTO stands of hot rolling finishing mill group 2000 is from 0.5 to Imm/s. ( P.I. Poloukhin "Rolling", Moscow, METALLURGIYA Publishers, 1982 ).
  • a low accuracy of rolling is also explained by an appreciable amount of springing of said stand screwdown mechanism elements.
  • the travel speed of rods of hydraulic screwdowns (HS), according to these sources, is 2.5 mm/s. Accuracy of adjustment is limited by the springing of elements of a hydraulic screwdown and a degree of elastic deformation of oil accounting for about 0.5 to 1%.
  • a disadvantage of the conventional screwdown mechanism is the impossibility to use it in updating the existing stands equipped with housing screws with an electromechanical drive means and hydraulic screwdowns which directly impact upon the rolls via chucks.
  • An object of the invention is to update a screwdown, increase the travel speed of rolls and consequent precision of rolling.
  • the screwdown mechanism of a stand comprising a hydraulic cylinder disposed between a stand housing and a chuck of a support roll is made up of a rod implemented from a permanent magnet, such as a barium oxide magnet, encompassed by an electromagnetic coil, at least two coils mounted in the chucks of support (press) rolls, which are disposed installed with respect to each other, and, along with this, one of them is connected with a d.c. source and the other with a capacitor bank.
  • the electromagnetic coil embracing the rod-magnet provides for regulating a rolling force within a tolerance zone by a thickness of strip, the electromagnetic coil connected with the d.c.
  • the coil connected with a capacitor bank contributes to delicately adjusting a clearance between rolls (i.e. a thickness of strip) owing to issuing thereinto large quantity narrow current pulses of a corresponding sign.
  • FIG. 1 showing a general diagram of a screwdown mechanism.
  • the screwdown mechanism comprises a spherical bearing 1 supported by a frame 2 of a stand, a rod 3 composed of a permanent magnet means (for example, the barium oxide one), a body 4 of a hydraulic cylinder, a coil 5 connected to a d.c. source 6, a hydraulic system 7, a chuck 8, a coil 9 and a coil 10 both mounted in the chuck 8, a capacitor bank 11, a charging device 12, a control unit 13.
  • Said frame 2, bearing I, body 4, chuck 8 are made of non-magnetic materials.
  • the screwdown mechanism is operated in the following manner.
  • the coarse adjustment of a clearance between rolls is carried out by feeding oil under pressure from a hydraulic system 7 for a rod 3, said coarse adjustment providing, at the time of rolling, a rolling force P h .
  • a discharge current pulse is sent to a coil 10 from a capacitor bank 11 of a corresponding sign and a clearance between rolls is changed in a stand in a very short time span (1 ⁇ 10 5 A, ⁇ 10 -5 s).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Press Drives And Press Lines (AREA)

Description

    Technical Field
  • The invention relates to rolling and can be used in rolling sectional and sheet steels, non-ferrous and non-metal materials.
    • Background Art
  • Known in the art is a stand comprising a housing, rolls, a roll drive means and a screwdown mechanism in the form of a screw (A.N.Tselikov "Machines and Aggregates of Metallurgical Plants", vol. 3, Moscow, METALLURGIYA Publishers, 1981).
  • A disadvantage of the screwdown mechanism of a conventional stand is a low speed and accuracy of adjusting a clearance between rolls. For instance, the travel speed of housing screws in the QUARTO stands of hot rolling finishing mill group 2000 is from 0.5 to Imm/s. (P.I. Poloukhin "Rolling", Moscow, METALLURGIYA Publishers, 1982). A low accuracy of rolling is also explained by an appreciable amount of springing of said stand screwdown mechanism elements.
  • Also known is a hydraulic screwdown replacing housing screws or working in combination therewith. (Firm SMS-Demag, the Third Congress of Rolling Mill Operators, Lipetsk, 19-22 October, 1999. The report by Pelking "The Latest Technologies in Cold Rolling"; the technological instruction TI 105-PHL-16-96, OAO Severstal, "Rolling of Strips on Five-stand Cold-Rolled Sheet Production Mill 1700", 1996).
  • The travel speed of rods of hydraulic screwdowns (HS), according to these sources, is 2.5 mm/s. Accuracy of adjustment is limited by the springing of elements of a hydraulic screwdown and a degree of elastic deformation of oil accounting for about 0.5 to 1%.
  • Known is a stand (Patent RU 2138346, published 27.09.99 . Bulletin No 27) which is provided with two permanent magnet means located at the periphery of contact, with respect to each other, with like poles, of which one is situated close to a press roll and the other close to a stand housing, both magnet means being provided with field coils for magnetizing, demagnetizing, reversing the sense of magnetization and neutralizing the magnetic fields and also with hydraulic cylinders for lifting and lowering repulsion magnet means.
  • A disadvantage of the conventional screwdown mechanism is the impossibility to use it in updating the existing stands equipped with housing screws with an electromechanical drive means and hydraulic screwdowns which directly impact upon the rolls via chucks.
    • Contents of the Invention
  • An object of the invention is to update a screwdown, increase the travel speed of rolls and consequent precision of rolling.
  • Said object is achieved owing to the fact that the screwdown mechanism of a stand comprising a hydraulic cylinder disposed between a stand housing and a chuck of a support roll is made up of a rod implemented from a permanent magnet, such as a barium oxide magnet, encompassed by an electromagnetic coil, at least two coils mounted in the chucks of support (press) rolls, which are disposed installed with respect to each other, and, along with this, one of them is connected with a d.c. source and the other with a capacitor bank. The electromagnetic coil embracing the rod-magnet provides for regulating a rolling force within a tolerance zone by a thickness of strip, the electromagnetic coil connected with the d.c. source and mounted in the roll chuck provides the attraction or repulsion of the chuck from a hydraulic cylinder piston, and the coil connected with a capacitor bank contributes to delicately adjusting a clearance between rolls (i.e. a thickness of strip) owing to issuing thereinto large quantity narrow current pulses of a corresponding sign.
    • Brief Description of the Drawing
  • A concept of invention is explained in Fig. 1 showing a general diagram of a screwdown mechanism.
    • Description of Preferable Alternative Embodiment of Invention
  • The screwdown mechanism comprises a spherical bearing 1 supported by a frame 2 of a stand, a rod 3 composed of a permanent magnet means (for example, the barium oxide one), a body 4 of a hydraulic cylinder, a coil 5 connected to a d.c. source 6, a hydraulic system 7, a chuck 8, a coil 9 and a coil 10 both mounted in the chuck 8, a capacitor bank 11, a charging device 12, a control unit 13. Said frame 2, bearing I, body 4, chuck 8 are made of non-magnetic materials.
  • The screwdown mechanism is operated in the following manner.
  • The coarse adjustment of a clearance between rolls is carried out by feeding oil under pressure from a hydraulic system 7 for a rod 3, said coarse adjustment providing, at the time of rolling, a rolling force Ph. With variations of a thickness of strip within thickness tolerance limits its adjustment is performed by supplying into coils 5 and 9, the continuous currents of a corresponding sign, which permits obtaining a rolling force P=Ph+Pem or P=Ph - Pem. With a polarity N-N, a chuck 8 is repulsed from the rod 3 with a force Pem and then P=Ph+Pem, thus reducing a thickness of strip; with a polarity N-S, the chuck 8 is attracted to the rod 3 with a force Pem and then P=Ph-Pem, thus increasing the strip thickness.
  • In the event of an abrupt (unexpected) change, during rolling, in a thickness of strip, a discharge current pulse is sent to a coil 10 from a capacitor bank 11 of a corresponding sign and a clearance between rolls is changed in a stand in a very short time span (1≈105 A, τ≈10-5s).
  • It is hence only logical to see that the invention allows one to use on the existing mills, in addition to hydraulic screwdowns (HS), an electromagnetic screwdown to carry out a more accurate rolling of strips.

Claims (1)

  1. A rolling will stand with a screwdown mechanism, the rolling mill stand comprising a hydraulic cylinder disposed between a stand housing and a chuck (8) of a support roll, characterized in that the screwdown mechanism is made up of a rod (3) implemented from a permanent magnet means, say, the barium oxide one, which is embraced by an electromagnetic coil (5) connected with a direct current (d.c.) source, at least two coils (9, 10) mounted in the chucks (8) of support rolls coaxially disposed with respect to each other, of which one is connected with the direct current (d.c) source and the other is connected with a capacitor bank (11).
EP01274224A 2001-04-23 2001-12-05 Pressure device for rolling mill Expired - Lifetime EP1398089B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
RU2001111160A RU2187394C1 (en) 2001-04-23 2001-04-23 Screwd0wn mechanism of rolling stand
RU2001111160 2001-04-23
PCT/RU2001/000526 WO2002090011A1 (en) 2001-04-23 2001-12-05 Pressure device for rolling mill

Publications (3)

Publication Number Publication Date
EP1398089A1 EP1398089A1 (en) 2004-03-17
EP1398089A4 EP1398089A4 (en) 2005-08-10
EP1398089B1 true EP1398089B1 (en) 2010-07-21

Family

ID=20248875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01274224A Expired - Lifetime EP1398089B1 (en) 2001-04-23 2001-12-05 Pressure device for rolling mill

Country Status (5)

Country Link
EP (1) EP1398089B1 (en)
JP (1) JP4111387B2 (en)
DE (1) DE60142645D1 (en)
RU (1) RU2187394C1 (en)
WO (1) WO2002090011A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0641786U (en) * 1992-11-17 1994-06-03 寛司 東 Jigsaw puzzle

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3529720A1 (en) * 1985-08-20 1987-03-05 Mannesmann Ag ARRANGEMENT OF A HYDRAULIC CONTROL CYLINDER
IT1239661B (en) * 1990-02-28 1993-11-11 Danieli Off Mecc HYDRAULIC PRESSURE DEVICE
RU2141880C1 (en) * 1998-04-03 1999-11-27 Открытое акционерное общество "Северсталь" Rolling stand
RU2138346C1 (en) * 1998-04-03 1999-09-27 Открытое акционерное общество "Северсталь" Rolling stand
RU2146971C1 (en) * 1998-05-13 2000-03-27 Открытое акционерное общество "Северсталь" Lengthwise rolling method and rolling stand for performing the same
RU2149718C1 (en) * 1999-01-27 2000-05-27 Открытое акционерное общество "Северсталь" Rolling stand
RU2207925C2 (en) * 2001-03-28 2003-07-10 Открытое акционерное общество "Северсталь" Method of rolling, stand of rolls and hold-down device of stands of rolls

Also Published As

Publication number Publication date
RU2187394C1 (en) 2002-08-20
JP2004524166A (en) 2004-08-12
EP1398089A1 (en) 2004-03-17
WO2002090011A1 (en) 2002-11-14
JP4111387B2 (en) 2008-07-02
EP1398089A4 (en) 2005-08-10
DE60142645D1 (en) 2010-09-02

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