EP1400289B1 - Rolling method and a rolling mill - Google Patents
Rolling method and a rolling mill Download PDFInfo
- Publication number
- EP1400289B1 EP1400289B1 EP01274032A EP01274032A EP1400289B1 EP 1400289 B1 EP1400289 B1 EP 1400289B1 EP 01274032 A EP01274032 A EP 01274032A EP 01274032 A EP01274032 A EP 01274032A EP 1400289 B1 EP1400289 B1 EP 1400289B1
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- EP
- European Patent Office
- Prior art keywords
- rolling
- rolls
- poles
- electromagnetic
- plane
- 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
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- 238000005096 rolling process Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title description 5
- 230000007246 mechanism Effects 0.000 claims description 34
- 230000005288 electromagnetic effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 abstract description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005097 cold rolling Methods 0.000 abstract description 2
- -1 ferrous metals Chemical class 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000000696 magnetic material Substances 0.000 abstract 1
- 239000007769 metal material Substances 0.000 abstract 1
- 238000003801 milling Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000003993 interaction Effects 0.000 description 3
- 210000003739 neck Anatomy 0.000 description 3
- 239000013598 vector Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000003467 diminishing effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000035485 pulse pressure Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
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
-
- 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
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- 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
- B21B2013/028—Sixto, six-high stands
-
- 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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
Definitions
- the present invention relates to rolling and can be used in mills for the hot/cold rolling of ferrous and non-ferrous metals and alloys.
- a rolling process (Patent RU No 2139153 , B21B 1/22, published 10.10.1999), according to which a rolling force distributed along roll barrels is produced with the aid of electromagnetic attractive or repulsive forces to be provided in an external electromagnetic field across a magnetic flux vector.
- the horizontal axes of the rolls are coincident with axes of symmetry of electromagnet poles, in which particular case the attractive forces of the rolls toward the poles are substantially parallel to a rolling plane. For this very reason, the rolls are attracted to the opposite poles with no rolling force created.
- a greater part of magnetic field energy does not participate in producing the rolling force that is here produced only by forces of attraction of the rolls to one another when being magnetized. Said circumstance is a drawback of the known rolling process as not allowing one to use all of the magnetic flux to produce said rolling force as much as possible.
- rolls are disposed in an external electromagnetic or magnetic field such that a field vector is directed along a diametral plane of a roll being in parallel relation to the rolling plane.
- An electric current is passed through the rolls thereat.
- Pressure on the rolls is distributed by changing a magnetic flux density along the generating line of roll barrels.
- a rolling force is created on account of the attractive forces of rolls used and also of forces of repulsion thereof.
- the poles of electromagnet means or magnet means are located between the diametral plane of the roll and the rolling plane.
- the electromagnet means or magnet means are provided with the like poles thereof with respect to each other, with a faculty of rotation thereof in a horizontal plane.
- the stand of the invention is provided with at least a pair of press rolls. The latter are disposed with freedom to move in a vertical plane and situated between the poles of electromagnet means or magnet means.
- the magnet means are adapted to move in the horizontal plane.
- At least one pair of permanent magnets or electromagnets have a capability of movement in the horizontal and vertical planes.
- Magnetic circuits are made up of the permanent magnets and provided with control coils supplied with pulse currents of a different correction sense.
- a drawback of the screwdown mechanism of a known stand is the 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 1 mm/s. ( P.I. Poloukhin "Rolling", Moscow, METALLURGIYA Publishers, 1982, page 386 ).
- a low accuracy of rolling is also explained by an appreciable amount of springing of said stand screwdown mechanism elements.
- the travel speed of the rods of hydraulic screwdowns (HS), according to these information sources, is 2.5 mm/s.
- the 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 known 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 affect the rolls via chucks.
- the task of the present invention is to simplify the design of a stand, increase the speed and accuracy of adjusting a clearance between rolls, and precisely regulating a force produced in rolling operations.
- the task set is accomplished by a rolling process and a rolling stand according to claim 1 and claim 5 respectively.
- a rolling force can be increased by auxiliary press rolls by electromagnetic effects produced on said auxiliary press rolls.
- the delicate adjustment of a rolling force is carried out by changing current level and/or issuing current pulses into the electromagnetic systems of a screwdown mechanism which are provided for the movable and stationary units of the screwdown mechanism, say, hydraulic system units.
- the stand is preferably provided with the supports of an electromagnetic system, which in turn may be equipped with travel mechanisms such as hydraulic cylinders.
- a stand can be provided with a pair of auxiliary press rolls and auxiliary press roll electromagnetic systems for cooperation with the auxiliary press rolls.
- the electromagnetic systems of auxiliary press rolls of a stand are preferably installed with a faculty of vertical movements with respect to a housing.
- a stand For the delicate regulation of a rolling force, a stand is provided with a screwdown mechanism comprising a hydraulic screwdown having a movable and stationary unit, both accommodating electromagnetic systems intended for interaction thereof.
- the screwdown mechanism may be composed of an electromechanical and/or hydraulic screwdown means in combination with the electromagnetic one.
- the screwdown mechanism of a stand comprises a hydraulic screwdown being comprised of a movable and stationary unit provided with electromagnetic systems for interaction thereof.
- the electromagnetic systems of a stand screwdown mechanism comprise at least two coils each, of which one is intended for connection to a d.c. source and the other in the form of an inductor is designated for connection to a discharge device, say, a capacitor bank associated with a control system, and a stationary unit is intended for cooperation with a housing screw of an electromechanical screwdown mechanism or a stand housing, while a movable unit - for articulated cooperation with a chuck of a press roll.
- an alleged invention makes it possible to appreciably expand the technological possibilities of stands for rolling strips by way of eliminating concentrated loads on roll necks, broadening a range of rolled strips, diminishing rejection as to size and improving rolling precision owing to an increase in the speed of response of a screwdown mechanism.
- a greater part of rolling force is created by electromagnetic volumetric forces (80-90%), the remaining part (10-20%) - by combined screwdown mechanisms (screw-HS) + (electromagnet) or (HS+ electromagnet); possible is a variant (screw+ electromagnet) ( ⁇ 100-200 tc) and, therefore, loading on roll necks will be reduced considerably. This will make it possible to diminish the diameters of the necks of press and working rolls, extend the service life of the rolls and bearings and appreciably decrease the longitudinal and transversal variations in thickness of the strips.
- FIG. 1 One of the embodiments of a rolling process is a stand schematically illustrated in Fig. 1 .
- the stand comprises a housing I made of nonmagnetic material, working rolls 2, press rolls 3, 4, III-like cores 5 with coils 6, solenoids 7, movable supports 8, supports 9 of hydraulic cylinders 10, housing screws II, chucks 12 of rolls the 4, and an electromechanical mechanism 13.
- the III-like electromagnet means are situated symmetrically of a vertical plane being perpendicular to a rolling plane 1 and being drawn through the centers of press and working rolls.
- the cores of said III-like electromagnet means are located between the diametral planes of the working and press rolls being in parallel relation to the rolling plane thereby to create the maximum forces of rolls attraction to the poles of the III-like electromagnet means. More, the relative position of the poles with respect to the vertical plane should correspond to the N-S-N or S-N-S diagram (cannot be otherwise).
- the distances "b" between the cores of the said III-like electromagnet means and rolls should be minimal, but not allowing their contact as the rolls wear out.
- the clearance "b" will gradually increase followed by the induction B and a rolling force diminishing little by little.
- the addition of currents to the coils of said III-like electromagnet means may be helpful in retaining the rolling force within specified limits on account of maintaining a certain magnetic flux density in the running clearance between the roll and the pole.
- the cores of said III-like electromagnet means being movable in vertical and horizontal planes, the size of an air gap can be adjusted mechanically, with its mean value maintained at constant level.
- the screwdown mechanism comprises a body 14 provided between a screw 11 and a chuck 12 of a roll 4 filled with oil 15, a hydraulic system 16.
- a movable unit 17 in the form of a piston
- a stationary unit 18 are arranged within the body 14, said units contain coils 19 provided , symmetrically of the body, connected to a d.c. source (not shown conventionally) and coils 20 in the form of inductors.
- the screwdown mechanism is connected with the screw II via a traverse 21 and with said chuck 12 body on the other side by means of traverses 22.
- the screwdown mechanism is capable of traveling together with the screw 11 and the chuck 12 in a vertical plane with the aid of a guide sleeve 23 secured on a housing I, of a commutation network 24.
- the stand is operated according to both QUARTO and SEXTO diagrams.
- the role of a screwdown mechanism is played by rolls 3, while rolls 4 perform the function of a mechanism of delicate adjustment of thickness of strip at the time of supplying currents of different signs into solenoids.
- the role of the screwdown mechanism is played by the rolls 3, 4 and a delicate adjustment of a strip section is carried out through current supply into coils 19 and electric impulses of different signs-into inductors 20.
- the stand is operated in the following manner.
- the automatic delicate adjustment of the thickness and section of a strip is carried out by issuing short electric impulses ⁇ ⁇ 10 -4 ; 10 -6 C into coils 19 and inductors 20 being different as to intensity and sign.
- the coarse adjustment of a clearance between rolls is effected by a housing screw from electromechanical drive means.
- a cavity "A" of a body 14 is connected with a drain line and the currents are supplied into coils 19 from a d.c. source of a direction when the surfaces of movable and stationary units facing each other have a different polarity (N-S).
- a movable unit will be attracted to the stationary one, and a screwdown mechanism with a chuck 12 and a roll 4 will travel in the screw 11 movement direction (up and down).
- a strip thickness automatic regulation system delivers the pulses (discharges) of strong currents into inductors 20 of one or different directions (1 ⁇ 10 5 A, t ⁇ 10 -5 c), a factor that makes it possible to remove momentarily impermissible variations in thickness lengthwise of the strip.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
Abstract
Description
- The present invention relates to rolling and can be used in mills for the hot/cold rolling of ferrous and non-ferrous metals and alloys.
- Known in the art is a rolling process (Patent
RU No 2139153 B21B 1/22, published 10.10.1999), according to which a rolling force distributed along roll barrels is produced with the aid of electromagnetic attractive or repulsive forces to be provided in an external electromagnetic field across a magnetic flux vector. According to the known process, the horizontal axes of the rolls are coincident with axes of symmetry of electromagnet poles, in which particular case the attractive forces of the rolls toward the poles are substantially parallel to a rolling plane. For this very reason, the rolls are attracted to the opposite poles with no rolling force created. In the known process, a greater part of magnetic field energy does not participate in producing the rolling force that is here produced only by forces of attraction of the rolls to one another when being magnetized. Said circumstance is a drawback of the known rolling process as not allowing one to use all of the magnetic flux to produce said rolling force as much as possible. - Also known is a process of lengthwise rolling and a stand for its realization (Patent
RU No 2146971 B21B 1/22, published 27.03.2000). According to the process, rolls are disposed in an external electromagnetic or magnetic field such that a field vector is directed along a diametral plane of a roll being in parallel relation to the rolling plane. An electric current is passed through the rolls thereat. Pressure on the rolls is distributed by changing a magnetic flux density along the generating line of roll barrels. A rolling force is created on account of the attractive forces of rolls used and also of forces of repulsion thereof. To produce an attractive force of the rolls, the poles of electromagnet means or magnet means are located between the diametral plane of the roll and the rolling plane. For a repulsive force of the rolls to be created, the electromagnet means or magnet means are provided with the like poles thereof with respect to each other, with a faculty of rotation thereof in a horizontal plane. The stand of the invention is provided with at least a pair of press rolls. The latter are disposed with freedom to move in a vertical plane and situated between the poles of electromagnet means or magnet means. The magnet means are adapted to move in the horizontal plane. At least one pair of permanent magnets or electromagnets have a capability of movement in the horizontal and vertical planes. Magnetic circuits are made up of the permanent magnets and provided with control coils supplied with pulse currents of a different correction sense. The drawbacks of the known technical solution are the complex structure of the stand because of the need to pass strong electric currents directly through the rolls and also a low accuracy of adjustment of a thickness of strip during the rolling. - Known 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 drawback of the screwdown mechanism of a known stand is the 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 1 mm/s. (P.I. Poloukhin "Rolling", Moscow, METALLURGIYA Publishers, 1982, page 386). A low accuracy of rolling is also explained by an appreciable amount of springing of said stand screwdown mechanism elements.
- Further known is a hydraulic screwdown replacing housing screws or cooperating therewith. (Firm CMC-Demag, the Third Congress of Rolling Mill Operators, Lipetsk, 19-22 October, 1999. The report by H-E. Pelking, pp.1-10 "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 the rods of hydraulic screwdowns (HS), according to these information sources, is 2.5 mm/s. The 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 in the art is a stand (Patent RF 2138346, published 27.09.99, Bulletin No 27), which has two permanent magnets situated at the periphery of contact with respect to each other with like poles, of which one is located close to a press roll and the other-close to a stand housing, both magnets 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 known 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 affect the rolls via chucks.
- The task of the present invention is to simplify the design of a stand, increase the speed and accuracy of adjusting a clearance between rolls, and precisely regulating a force produced in rolling operations.
- The task set is accomplished by a rolling process and a rolling stand according to
claim 1 and claim 5 respectively. - A rolling force can be increased by auxiliary press rolls by electromagnetic effects produced on said auxiliary press rolls.
- For the delicate adjustment of a rolling force, it can be advantageous to use a screwdown mechanism of combined action, which provides for an electromechanical, hydraulic and electromagnetic impact on the rolls.
- The delicate adjustment of a rolling force is carried out by changing current level and/or issuing current pulses into the electromagnetic systems of a screwdown mechanism which are provided for the movable and stationary units of the screwdown mechanism, say, hydraulic system units.
- The stand is preferably provided with the supports of an electromagnetic system, which in turn may be equipped with travel mechanisms such as hydraulic cylinders.
- For a rolling force to be increased, a stand can be provided with a pair of auxiliary press rolls and auxiliary press roll electromagnetic systems for cooperation with the auxiliary press rolls.
- The electromagnetic systems of auxiliary press rolls of a stand are preferably installed with a faculty of vertical movements with respect to a housing.
- For the delicate regulation of a rolling force, a stand is provided with a screwdown mechanism comprising a hydraulic screwdown having a movable and stationary unit, both accommodating electromagnetic systems intended for interaction thereof.
- The screwdown mechanism may be composed of an electromechanical and/or hydraulic screwdown means in combination with the electromagnetic one.
- The screwdown mechanism of a stand, according to the invention, comprises a hydraulic screwdown being comprised of a movable and stationary unit provided with electromagnetic systems for interaction thereof.
- Preferably the electromagnetic systems of a stand screwdown mechanism comprise at least two coils each, of which one is intended for connection to a d.c. source and the other in the form of an inductor is designated for connection to a discharge device, say, a capacitor bank associated with a control system, and a stationary unit is intended for cooperation with a housing screw of an electromechanical screwdown mechanism or a stand housing, while a movable unit - for articulated cooperation with a chuck of a press roll.
- Thus, an alleged invention makes it possible to appreciably expand the technological possibilities of stands for rolling strips by way of eliminating concentrated loads on roll necks, broadening a range of rolled strips, diminishing rejection as to size and improving rolling precision owing to an increase in the speed of response of a screwdown mechanism. In the claimed construction of a stand, a greater part of rolling force is created by electromagnetic volumetric forces (80-90%), the remaining part (10-20%) - by combined screwdown mechanisms (screw-HS) + (electromagnet) or (HS+ electromagnet); possible is a variant (screw+ electromagnet) (~ 100-200 tc) and, therefore, loading on roll necks will be reduced considerably. This will make it possible to diminish the diameters of the necks of press and working rolls, extend the service life of the rolls and bearings and appreciably decrease the longitudinal and transversal variations in thickness of the strips.
- Now the invention will be described by way of example with reference to the accompanying drawings in which:
-
Fig. 1 - diagram of a stand according to the invention; -
Fig. 2 - view A inFig. 1 ; -
Fig. 3 - diagram of a stand screwdown mechanism. - One of the embodiments of a rolling process is a stand schematically illustrated in
Fig. 1 . - The stand comprises a housing I made of nonmagnetic material,
working rolls 2,press rolls like cores 5 withcoils 6,solenoids 7,movable supports 8, supports 9 ofhydraulic cylinders 10, housing screws II, chucks 12 of rolls the 4, and anelectromechanical mechanism 13. - The III-like electromagnet means are situated symmetrically of a vertical plane being perpendicular to a
rolling plane 1 and being drawn through the centers of press and working rolls. The cores of said III-like electromagnet means are located between the diametral planes of the working and press rolls being in parallel relation to the rolling plane thereby to create the maximum forces of rolls attraction to the poles of the III-like electromagnet means. More, the relative position of the poles with respect to the vertical plane should correspond to the N-S-N or S-N-S diagram (cannot be otherwise). The distances "b" between the cores of the said III-like electromagnet means and rolls should be minimal, but not allowing their contact as the rolls wear out. As a result of roll wear in time and descent thereof, the clearance "b" will gradually increase followed by the induction B and a rolling force diminishing little by little. Inasmuch as a change in the clearances "b" is symmetrical with respect to the vertical axis of symmetry of the rolls, then the addition of currents to the coils of said III-like electromagnet means may be helpful in retaining the rolling force within specified limits on account of maintaining a certain magnetic flux density in the running clearance between the roll and the pole. On implementation of the cores of said III-like electromagnet means being movable in vertical and horizontal planes, the size of an air gap can be adjusted mechanically, with its mean value maintained at constant level. - The screwdown mechanism comprises a
body 14 provided between ascrew 11 and achuck 12 of aroll 4 filled withoil 15, ahydraulic system 16. A movable unit 17 (in the form of a piston) and astationary unit 18 are arranged within thebody 14, said units containcoils 19 provided , symmetrically of the body, connected to a d.c. source (not shown conventionally) and coils 20 in the form of inductors. On one side, the screwdown mechanism is connected with the screw II via atraverse 21 and with saidchuck 12 body on the other side by means of traverses 22. The screwdown mechanism is capable of traveling together with thescrew 11 and thechuck 12 in a vertical plane with the aid of aguide sleeve 23 secured on a housing I, of acommutation network 24. - The stand is operated according to both QUARTO and SEXTO diagrams. In the first instance, the role of a screwdown mechanism is played by
rolls 3, whilerolls 4 perform the function of a mechanism of delicate adjustment of thickness of strip at the time of supplying currents of different signs into solenoids. As is the case with the SEXTO diagram, the role of the screwdown mechanism is played by therolls coils 19 and electric impulses of different signs-intoinductors 20. - According to
Fig. 1 , a full rolling force is equal to:
wherein
wherein
B - induction in an air gap between a roll and a pole (TL),
S1- pole area embracing a working roll (M2),
S2 - pole area embracing a press roll (M2),
S3 - area of a solenoid window (M2),
Dp - dia. of piston MGEMNY (M),
Ph - hydraulic pressure (Pa),
Pel. - electromagnetic pressure on a piston surface (Pa),
Pmf - pulse pressure of an inductor magnetic field,
µ = 4π 10-7 G/m- vacuum magnetic permeability,
α - angle between vectors Q and P (DEG),
we obtain:
wherein:
wherein: - ( when Hz=Ho and β2 = 1); ("Mechanical Interactions in Strong Magnetic Fields". Mezhvouzovsky Sbornik, Leningrad, 1974, page 88).
n - number of turns of an inductor, Jin current in the inductor,
a - current band width of an inductor. - According to the SEXTO diagram, the stand is operated in the following manner.
- Current is supplied into a
solenoid 7 situated from above a rolling plane, said solenoid descending, with the aid ofmovable supports 8, onto atop press roll 3 to catch it. An electromechanical device is then turned on and atop roll 14 is raised with a combined screwdown mechanism with the aid of ascrew 11. Thetop roll 3 is simultaneously raised by movingsupports 8 in unison with thescrew 11. - With a desired clearance allowed between a
press roll 3 and a workingroll 2, a strip is fed into the working rolls, said workingrolls 2 diverging to thrust against therolls 3. In this state, the stand is ready to work. On connection of roll drive means, a rolling operation occurs. Adjustment of the clearance between rolls is effected by way of changing a current intensity in the coils b of III-like cores and/or in asolenoid 7. - The automatic delicate adjustment of the thickness and section of a strip is carried out by issuing short electric impulses τ ≈ 10-4 ; 10-6C into
coils 19 andinductors 20 being different as to intensity and sign. - Given below is a detailed description of the operation of a screwdown mechanism.
- The coarse adjustment of a clearance between rolls is effected by a housing screw from electromechanical drive means.
- Moreover, a cavity "A" of a
body 14 is connected with a drain line and the currents are supplied intocoils 19 from a d.c. source of a direction when the surfaces of movable and stationary units facing each other have a different polarity (N-S). - This being so, a movable unit will be attracted to the stationary one, and a screwdown mechanism with a
chuck 12 and aroll 4 will travel in thescrew 11 movement direction (up and down). With a clearance adjusted and rolled products fed into theroll 4, a cavity "A" is coupled with a line of pressure and a rolling operation is conducted with the force Pp = Ph + Pem, wherein Ph - force produced by a hydraulic cylinder with the aid of hydraulic pressure, Pem - electromagnetic force produced in pushing the movable unit away from the stationary unit on account of supplying the currents intocoils 19 of a direction when the poles are created with a like polarity (N-N or S-S). The normal adjustment of a clearance size between rolls and, hence, a thickness of strip is accomplished by reducing or increasing hydraulic pressure, while a more accurate adjustment is provided by an increase or decrease in the current intensity of thecoils 19. In the event of abrupt strip thickness variations through the value greater than tolerance limits, a strip thickness automatic regulation system delivers the pulses (discharges) of strong currents intoinductors 20 of one or different directions (1≈105A, t ≈ 10-5 c), a factor that makes it possible to remove momentarily impermissible variations in thickness lengthwise of the strip. - It is hence only logical to conclude that the invention enables one to use on existing stands, a screwdown mechanism contributing to more accurate rolling operations.
Claims (11)
- A rolling process comprising producing and regulating a rolling force through electromagnetic systems, each one being intended for cooperation, respectively, with the working (2), press (3) and auxiliary press rolls (4) of a stand, the auxiliary press (3) rolls are installed with freedom to move in a vertical plane, characterized in that the rolling force is created by electromagnet means (5, 6, 7, 8, 9, 10, 11, 12, 13) with III-like cores (5) situated symmetrically of a rolling plane such that the poles of the III-like cores (5) embrace the rolls (2, 3) beneath diametral planes thereof being parallel to the rolling plane, on the side of the rolling plane, and the internal poles embrace the working rolls (2) and the external poles - the press rolls (3), with the rolling force regulated by way of changing a current intensity in the coils (6) of the III-like cores (5) in combination with electromagnetic effects produced on the auxiliary press rolls (4).
- A rolling process according to claim 2, characterized in that a rolling force is increased by auxiliary press rolls (4) through electromagnetic effects produced on said auxiliary press rolls (4).
- A rolling process according to claim 1 or 2, characterized in that for the rolling force to be adjusted in a delicate manner, use is made of a screwdown mechanism (11, 12, 14, 15, 16, 17, 18, 19, 20) of combined action that contributes to electromechanical, hydraulic and electromagnetic effects produced on the rolls (2, 3, 4).
- A rolling process according to claim 3, characterized in that the delicate adjustment of the rolling force is carried out by changing a current level and/or delivering the current impulses into electromagnetic systems (5, 6, 7, 8, 9, 10, 11, 12, 13) of the screwdown mechanism (11, 12, 14, 15, 16, 17, 18, 19, 20) with which the movable and stationary units of the screwdown mechanism (11, 12, 14, 15, 16, 17, 18, 19, 20) are provided, say, the units of a hydraulic system.
- A rolling stand comprising a housing (1) made of nonmagnetic material, working (2) and press rolls (3), a roll drive means and an electromagnetic system (5, 6, 7, 8, 9, 10, 11, 12, 13), the rolls (2, 3) are installed with a faculty of travel in a vertical plane, characterized in that the electromagnetic system (5, 6, 7, 8, 9, 10, 11, 12, 13) is configured as at least a pair of III-like cores (5) with coils (6) encompassing the internal poles of said cores (5), the working (2) and press rolls (3) are disposed between the poles of the III-like cores (5), the III-like cores (5) are mounted symmetrically of a rolling plane, the poles of the III-like cores (5) encompass the rolls (2, 3) beneath diametral planes thereof being parallel to the rolling plane, on the side of the rolling plane, with the internal poles encompassing the working rolls (2) and the external poles - the press rolls (3);
the stand is provided with a pair of auxiliary press rolls (4) and the electromagnetic systems (5, 6, 7, 8, 9, 10, 11, 12, 13) of the auxiliary press rolls (4) intended for cooperation with the auxiliary press rolls (4);
wherein the electromagnetic systems (5, 6, 7, 8, 9, 10, 11, 12, 13) of the auxiliary press (4) rolls are mounted with a capability of vertical movement with respect to a housing (1). - A rolling stand according to claim 5, characterized in that it is provided with the supports (1, 2, 3) of the electromagnetic system (5, 6, 7, 8, 9, 10, 11, 12, 13).
- A rolling stand according to claim 6, characterized in that the supports (1, 2, 3) are provided with travel mechanisms, such as hydraulic cylinders.
- A rolling stand according to any one of claims 5 to 7, characterized in that it is provided with a pair of auxiliary press rolls (4) and the electromagnetic systems (5, 6, 7, 8, 9, 10, 11, 12, 13) of the auxiliary press (4) rolls intended for cooperation with auxiliary press rolls (4).
- A rolling stand according to claim 8, characterized in that the electromagnetic system (5, 6, 7, 8, 9, 10, 11, 12, 13) of the auxiliary press rolls (4) are mounted with freedom to vertically move with respect to a housing (1).
- A rolling stand according to claim 8 or 9, characterized in that it is provided with a screwdown mechanism (11, 12, 14, 15, 16, 17, 18, 19, 20) comprising a hydraulic screwdown (16, 17, 18) with movable (17) and stationary units (18) which accommodate electromagnetic systems (5, 6, 7, 8, 9, 10, 11, 12, 13) intended for cooperation one with another.
- A rolling stand according to claim 8 or 9, characterized in that the screwdown mechanism (16, 17, 18) comprises an electromechanical and / or hydraulic screwdown mechanism in combination with the electromagnetic one.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2001108349 | 2001-03-28 | ||
RU2001108349A RU2207925C2 (en) | 2001-03-28 | 2001-03-28 | Method of rolling, stand of rolls and hold-down device of stands of rolls |
PCT/RU2001/000481 WO2002076644A1 (en) | 2001-03-28 | 2001-11-14 | Rolling method, a roll mill and a screw-down structure |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1400289A1 EP1400289A1 (en) | 2004-03-24 |
EP1400289A4 EP1400289A4 (en) | 2007-07-18 |
EP1400289B1 true EP1400289B1 (en) | 2010-12-29 |
Family
ID=20247751
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01274032A Expired - Lifetime EP1400289B1 (en) | 2001-03-28 | 2001-11-14 | Rolling method and a rolling mill |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1400289B1 (en) |
JP (1) | JP4263486B2 (en) |
DE (1) | DE60143772D1 (en) |
RU (1) | RU2207925C2 (en) |
WO (1) | WO2002076644A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2187394C1 (en) * | 2001-04-23 | 2002-08-20 | Открытое акционерное общество "Северсталь" | Screwd0wn mechanism of rolling stand |
RU179561U1 (en) * | 2017-06-01 | 2018-05-17 | Лев Георгиевич Делюсто | UNIVERSAL MAGNETIC CART FOR STRIP ROLLING |
KR102483613B1 (en) | 2017-10-20 | 2023-01-02 | 삼성전기주식회사 | Printed circuit board |
CN110328235A (en) * | 2019-07-15 | 2019-10-15 | 上海大学 | A method of the high silicon steel cold rolling under magnetic field |
CN116921429B (en) * | 2023-09-13 | 2023-12-08 | 福建紫金英菲迅应用材料有限公司 | Silver-copper alloy manufacturing system and manufacturing method thereof |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI52394C (en) * | 1975-12-31 | 1977-08-10 | Valmet Oy | Bending compensated, end-loaded roller, in particular a press roll in a paper machine. |
JPS57206506A (en) * | 1981-06-12 | 1982-12-17 | Toshiba Corp | Rolling mill |
RU2125917C1 (en) * | 1997-10-29 | 1999-02-10 | Открытое акционерное общество "Северсталь" | Hydromechanical screwdown apparatus |
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 |
-
2001
- 2001-03-28 RU RU2001108349A patent/RU2207925C2/en active
- 2001-11-14 JP JP2002575148A patent/JP4263486B2/en not_active Expired - Fee Related
- 2001-11-14 WO PCT/RU2001/000481 patent/WO2002076644A1/en active Application Filing
- 2001-11-14 DE DE60143772T patent/DE60143772D1/en not_active Expired - Lifetime
- 2001-11-14 EP EP01274032A patent/EP1400289B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP2004527378A (en) | 2004-09-09 |
EP1400289A1 (en) | 2004-03-24 |
JP4263486B2 (en) | 2009-05-13 |
WO2002076644A1 (en) | 2002-10-03 |
RU2207925C2 (en) | 2003-07-10 |
EP1400289A4 (en) | 2007-07-18 |
DE60143772D1 (en) | 2011-02-10 |
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