EP0888832A2 - A method of rolling a metal strip and a rolling mill for implementing the method. - Google Patents
A method of rolling a metal strip and a rolling mill for implementing the method. Download PDFInfo
- Publication number
- EP0888832A2 EP0888832A2 EP98201796A EP98201796A EP0888832A2 EP 0888832 A2 EP0888832 A2 EP 0888832A2 EP 98201796 A EP98201796 A EP 98201796A EP 98201796 A EP98201796 A EP 98201796A EP 0888832 A2 EP0888832 A2 EP 0888832A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- strip
- rolling mill
- rolling
- path
- 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.)
- Withdrawn
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 title claims abstract description 9
- 238000000926 separation method Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
Definitions
- the present invention relates to a method of rolling a metal strip extending along a path between two housings of a rolling mill.
- Strips are rolled, with progressive reduction of the width of the strip, by the passage of the strip through rolling housings arranged in sequence and operating on the strip simultaneously.
- the longitudinal speed of the strip increases progressively from the input housing to the output housing and, consequently, in order to prevent excessive accumulations or pull between one housing and another, the speed of the main motors which drive the rolls of the housings is regulated by control of the pull between housings.
- pulling devices In order to exert a pull, albeit limited, between the housings, pulling devices, commonly known as loopers, are normally interposed between the housings, such a device comprising a roller which is not driven, acting on the strip in order to keep the loops formed between the housings within a predetermined range when the downstream housing does not take in the strip sufficiently or when the speed of the downstream housing is excessive.
- the pulling device also performs the function of regulating the pull by means of a suitable control of the load.
- the pulling device normally acts underneath the strip being rolled and performs a mainly vertical action on the strip which is increased by its movement upwards.
- the looper roller may be mounted on a vertically movable element or may be mounted on a frame pivoting about a fixed axis.
- the position of the roller may be adjusted by electromechanical or hydraulic control devices. Determination of the position of the roller and the force it exerts on the strip enables a correct strategy to be implemented in the regulation of the motors of the housings.
- the invention is based on the observation that a predominantly resilient lengthening of the fibres of the strip brings about a variation in the local force separating the rolls.
- the present invention Provides a method of the type specified which is characterized in that it comprises the step of imposing on the strip a lengthening of the path which differs across the width of the strip in order to achieve differentiated lengthening of the strip across its width.
- a rolling mill is generally indicated 1, the drawings being limited to a portion thereof disposed between two successive rolling housings 2 and 3, that is, more precisely, an upstream housing 2 with rolls 2a and a downstream housing 3 with rolls 3a.
- a path 4 for a metal strip 5 which is being rolled extends between the housings 2 and 3 in the direction of the arrow F.
- a central longitudinal band 6, opposed longitudinal edge bands 7, and a lower face 8 are identified within the strip.
- the strip 5 is acted on by a first roller 9 and a second roller 10 of respective pulling devices, or so-called loopers, indicated 11 and 12, respectively.
- the rollers 9 and 10 act on the same face of the strip 5, in the embodiment shown, on its lower face 8.
- the rollers 9 and 10 are disposed side by side, the first roller being disposed on the same side as the downstream housing 3 and the second roller being disposed on the same side as the upstream housing 2.
- the first roller 9 is shaped. It is preferably convex in the centre; in other words, it has a barrel-shaped profile. It freely rotatable on an element 13 of the pulling device 11, this element 13 being movable vertically and being acted on by pressure means 14 which urge the first roller 9 against the strip with a predetermined force.
- the second roller 10 has a profile different from the profile of the first roller 9 and, in particular, is a uniform cylinder. It is supported for rotating idly on an element 15 of the pulling device 12, the element 15 being movable vertically and being acted on by pressure means 16 which urge the second roller 10 against the strip 5 with a predetermined force.
- rollers may be mounted on a pivoting frame instead of on the vertically movable element.
- the second roller indicated 17 in Figures 5 and 6, has a profile which is concave in the centre.
- the first roller 9 is mounted on the element 11 so as to be movable axially under the action of a piston and cylinder unit 18; the second roller 10 in general, and the second roller 17 in particular, is mounted on the element 13 so as to be movable axially under the action of a piston and roller unit 19.
- the rollers 9, 10 and 17 may be capable of being inclined in a vertical plane by the respective pressure means 14 and 16 instead of being movable axially.
- the first roller imposes on the central longitudinal band 6 a movement away from the path 4 to a new path 4' which is longer than the path 4, and hence causes a substantially resilient lengthening of the path relative to the path which the edge bands 7 follow.
- the imposition of differentiated lengthening on different longitudinal bands results in differentiated relief of the separation force from one band to another.
- a suitable relative position of the roller 9 and of the roller 10 in the vertical direction enables the width of the central band 6 to be varied.
- a suitable axial displacement of the roller 9 enables the position, of the band 6 within the width of the strip also to be varied slightly.
- a suitable relative position of the roller 9 and of the roller 17 in the vertical direction enables the greater lengthening of the central band 6 in comparison with the edge bands 7 to be attenuated continuously until the situation is reversed and a greater lengthening of the edge bands 7 in comparison with the central band 6 is brought about.
- a suitable axial displacement of the roller 17 enables the ratio between the widths of the edge bands to be varied slightly.
- a method of rolling a metal strip 5 extending along a path 4 between two housings 2 and 3 of a rolling mill 1 comprises the step of imposing on the strip 5 a lengthening of its path 4 which differs across the width of the strip in order to achieve differentiated lengthening of the strip across its width.
- the lengthening of the path 4 is preferably imposed on a substantially central longitudinal band 6 of the strip in order to bring about a lengthening of the strip in the region of this band.
- the main advantage of the rolling method and of the rolling mill for implementing the method lies in their simplicity and effectiveness.
- a further advantage of the invention lies in the ease with which the method and the rolling mill can be adapted to specific circumstances which arise gradually such as, for example, progressive wear of the rolls and variation in the thermal expansion of the rolls both during the course of the rolling operation and from the head end to the tail end of an individual rolled strip.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
A method of rolling a metal strip (5) extending
along a path (4) between two housings (2, 3) of a
rolling mill (1), which achieves improved uniformity
in the thickness of the strip across its width and
improved flatness in an unusually easy manner,
comprises the step of imposing on the strip (5) a
lengthening of the path which differs across the
width of the strip.
Description
The present invention relates to a method of
rolling a metal strip extending along a path between
two housings of a rolling mill.
Strips are rolled, with progressive reduction
of the width of the strip, by the passage of the
strip through rolling housings arranged in sequence
and operating on the strip simultaneously.
The longitudinal speed of the strip increases
progressively from the input housing to the output
housing and, consequently, in order to prevent
excessive accumulations or pull between one housing
and another, the speed of the main motors which
drive the rolls of the housings is regulated by
control of the pull between housings.
In order to exert a pull, albeit limited,
between the housings, pulling devices, commonly
known as loopers, are normally interposed between
the housings, such a device comprising a roller
which is not driven, acting on the strip in order to
keep the loops formed between the housings within a
predetermined range when the downstream housing does
not take in the strip sufficiently or when the speed
of the downstream housing is excessive. Moreover,
the pulling device also performs the function of
regulating the pull by means of a suitable control
of the load.
The pulling device normally acts underneath the
strip being rolled and performs a mainly vertical
action on the strip which is increased by its
movement upwards. The looper roller may be mounted
on a vertically movable element or may be mounted on
a frame pivoting about a fixed axis.
The position of the roller may be adjusted by
electromechanical or hydraulic control devices.
Determination of the position of the roller and the
force it exerts on the strip enables a correct
strategy to be implemented in the regulation of the
motors of the housings.
Within this sector of the art, there is a need
to ensure a uniform thickness of the strip across
its width. In particular, it is necessary for a
uniform opening to be formed between the opposed
rolls in the rolling housings under stress, over the
entire useful length of the rolls.
It has been proposed to confer on the rolls a
suitable curvature to compensate for their bending
under stress. This solution is satisfactory but
only in a particular operative condition in which
the stresses are of a magnitude such as to deform
the rolls to an extent equal and opposite to the
curvature.
It has been proposed to subject the opposed
bearings of the rolls to preloading torques which
oppose the aforementioned bending. This solution
has the disadvantage of requiring generous
dimensions of the necks and bearings of the rolls.
It has also been proposed to incline the axes
of the opposed rolls so as to render them oblique.
This solution is structurally complex.
The problem upon which the present invention is
based is that of devising a method of the type
specified which overcomes the Problems mentioned
with reference to the prior art.
The invention is based on the observation that
a predominantly resilient lengthening of the fibres
of the strip brings about a variation in the local
force separating the rolls.
On the basis of the above-mentioned
observation, and in order to solve the abovementioned
technical problem, the present invention
Provides a method of the type specified which is
characterized in that it comprises the step of
imposing on the strip a lengthening of the path
which differs across the width of the strip in order
to achieve differentiated lengthening of the strip
across its width.
Further characteristics and the advantages of
the method according to the present invention will
become clear from the following description of an
embodiment thereof given with reference to a rolling
mill which will be described below with reference to
the appended drawings, in which:
With reference to the appended drawings, a
rolling mill is generally indicated 1, the drawings
being limited to a portion thereof disposed between
two successive rolling housings 2 and 3, that is,
more precisely, an upstream housing 2 with rolls 2a
and a downstream housing 3 with rolls 3a.
A path 4 for a metal strip 5 which is being
rolled extends between the housings 2 and 3 in the
direction of the arrow F. A central longitudinal
band 6, opposed longitudinal edge bands 7, and a
lower face 8 are identified within the strip.
Along the path 4, the strip 5 is acted on by a
first roller 9 and a second roller 10 of respective
pulling devices, or so-called loopers, indicated 11
and 12, respectively. In accordance with a
preferred solution, the rollers 9 and 10 act on the
same face of the strip 5, in the embodiment shown,
on its lower face 8.
The rollers 9 and 10 are disposed side by side,
the first roller being disposed on the same side as
the downstream housing 3 and the second roller being
disposed on the same side as the upstream housing 2.
The first roller 9 is shaped. It is preferably
convex in the centre; in other words, it has a
barrel-shaped profile. It freely rotatable on an
element 13 of the pulling device 11, this element 13
being movable vertically and being acted on by
pressure means 14 which urge the first roller 9
against the strip with a predetermined force.
The second roller 10 has a profile different
from the profile of the first roller 9 and, in
particular, is a uniform cylinder. It is supported
for rotating idly on an element 15 of the pulling
device 12, the element 15 being movable vertically
and being acted on by pressure means 16 which urge
the second roller 10 against the strip 5 with a
predetermined force.
Naturally, the aforementioned rollers may be
mounted on a pivoting frame instead of on the
vertically movable element.
It should be noted that, in accordance with a
variant, the second roller, indicated 17 in Figures
5 and 6, has a profile which is concave in the
centre.
The first roller 9 is mounted on the element 11
so as to be movable axially under the action of a
piston and cylinder unit 18; the second roller 10
in general, and the second roller 17 in particular,
is mounted on the element 13 so as to be movable
axially under the action of a piston and roller unit
19. Alternatively, and for the same purposes, the
rollers 9, 10 and 17 may be capable of being
inclined in a vertical plane by the respective
pressure means 14 and 16 instead of being movable
axially.
In operation, owing to its centrally convex
profile, the first roller imposes on the central
longitudinal band 6 a movement away from the path 4
to a new path 4' which is longer than the path 4,
and hence causes a substantially resilient
lengthening of the path relative to the path which
the edge bands 7 follow.
As a result, the local separation force is
relieved in the central regions of the rolls of the
downstream housing and also of the rolls of the
upstream housing, although to a lesser extent.
In general, the imposition of differentiated
lengthening on different longitudinal bands results
in differentiated relief of the separation force
from one band to another.
A suitable relative position of the roller 9
and of the roller 10 in the vertical direction
enables the width of the central band 6 to be
varied.
A suitable axial displacement of the roller 9
enables the position, of the band 6 within the width
of the strip also to be varied slightly.
A suitable relative position of the roller 9
and of the roller 17 in the vertical direction
enables the greater lengthening of the central band
6 in comparison with the edge bands 7 to be
attenuated continuously until the situation is
reversed and a greater lengthening of the edge bands
7 in comparison with the central band 6 is brought
about.
A suitable axial displacement of the roller 17
enables the ratio between the widths of the edge
bands to be varied slightly.
A method of rolling a metal strip 5 extending
along a path 4 between two housings 2 and 3 of a
rolling mill 1 comprises the step of imposing on the
strip 5 a lengthening of its path 4 which differs
across the width of the strip in order to achieve
differentiated lengthening of the strip across its
width. The lengthening of the path 4 is preferably
imposed on a substantially central longitudinal band
6 of the strip in order to bring about a lengthening
of the strip in the region of this band.
The main advantage of the rolling method and of
the rolling mill for implementing the method lies in
their simplicity and effectiveness.
A further advantage of the invention lies in
the ease with which the method and the rolling mill
can be adapted to specific circumstances which arise
gradually such as, for example, progressive wear of
the rolls and variation in the thermal expansion of
the rolls both during the course of the rolling
operation and from the head end to the tail end of
an individual rolled strip.
Naturally in order to satisfy contingent and
specific requirements, an expert in the art may
apply to the above-described method and rolling mill
many modifications and variations all of which,
however, are included in the scope of protection of
the invention as defined by the following claims.
Claims (12)
- A method of rolling a metal strip (5) extending along a path (4) between two housings (2, 3) of a rolling mill (1), characterized in that it comprises the step of imposing on the strip (5) a lengthening of the path which differs across the width of the strip in order to bring about differentiated lengthening of the strip across its width.
- A method according to Claim 1, characterized in that the lengthening of the path is imposed on a substantially central longitudinal band (6) of the strip (5) in order to bring about a lengthening of the strip (5) in the region of this band (6).
- A rolling mill (1) for rolling a metal strip (5), of the type comprising a path (4) for the strip, extending between two rolling housings (2, 3), characterized in that it comprises a first roller (9) acting on the strip (5) along the path (4) and pressure means for urging the shaped roller (9) against the strip (5) with a predetermined force, the roller being shaped in order to impose on at least one longitudinal band (6) of the strip (5) a lengthening of the path and hence a reduction in the local separation force in the region of the band (6).
- A rolling mill (1) according to Claim 3, characterized in that the first roller (9) has a shaped profile which is convex in the centre.
- A rolling mill (1) according to Claim 4, characterized in that it comprises a second roller (10, 17) acting on the strip (5) beside the roller (9) with the convex profile, the second roller (10, 17) having a profile different from that of the first roller (9) with the convex profile.
- A rolling mill (1) according to Claim 5, characterized in that the second roller (10) is a uniform cylinder.
- A rolling mill (1) according to Claim 5, characterized in that the second roller (17) has a profile which is concave in the centre.
- A rolling mill (1) according to Claim 3, characterized in that the first roller (9) is movable axially.
- A rolling mill (1) according to Claim 5, characterized in that the second roller (10, 17) is movable axially.
- A rolling mill (1) according to Claim 5, characterized in that the first roller (9) and the second roller (10, 17) act on the strip on the same side thereof.
- A pulling device (11, 12) for a rolling mill (1) for rolling a metal strip (5), of the type comprising a roller (9, 17) for acting on the strip (5), characterized in that the roller (9, 17) is shaped.
- A roller (9, 17) of a pulling device (11, 12) of a rolling mill (1) for rolling a metal strip, characterized in that it has a shaped profile.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI971569 | 1997-07-02 | ||
| IT97MI001569A IT1292458B1 (en) | 1997-07-02 | 1997-07-02 | METHOD OF ROLLING A METAL TAPE AND ROLLING MILL FOR IMPLEMENTING THE METHOD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0888832A2 true EP0888832A2 (en) | 1999-01-07 |
| EP0888832A3 EP0888832A3 (en) | 2000-03-22 |
Family
ID=11377485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98201796A Withdrawn EP0888832A3 (en) | 1997-07-02 | 1998-05-29 | A method of rolling a metal strip and a rolling mill for implementing the method. |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0888832A3 (en) |
| IT (1) | IT1292458B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110756592A (en) * | 2019-09-29 | 2020-02-07 | 武汉钢铁有限公司 | Method and device for controlling tail width of hot-rolled strip steel |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3782152A (en) * | 1971-04-22 | 1974-01-01 | Centro Speriment Metallurg | Apparatus for improving the flatness of rolled strips |
| GB1496946A (en) * | 1974-08-06 | 1978-01-05 | Nippon Kokan Kk | Method for controlling flatness of metal sheet in rolling |
| JPS61229405A (en) * | 1985-04-03 | 1986-10-13 | Nippon Steel Corp | Method and apparatus for adjusting plate shape of rolling material |
| JPS6293016A (en) * | 1985-10-18 | 1987-04-28 | Nippon Steel Corp | Adjusting device for plate shape of rolling stock |
| JPH03221204A (en) * | 1990-01-29 | 1991-09-30 | Nkk Corp | Shape control method of hot rolled sheet |
| DE19503363A1 (en) * | 1994-02-15 | 1995-09-07 | Siemens Ag | Control of properties of cold-rolled strips |
-
1997
- 1997-07-02 IT IT97MI001569A patent/IT1292458B1/en active IP Right Grant
-
1998
- 1998-05-29 EP EP98201796A patent/EP0888832A3/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3782152A (en) * | 1971-04-22 | 1974-01-01 | Centro Speriment Metallurg | Apparatus for improving the flatness of rolled strips |
| GB1496946A (en) * | 1974-08-06 | 1978-01-05 | Nippon Kokan Kk | Method for controlling flatness of metal sheet in rolling |
| JPS61229405A (en) * | 1985-04-03 | 1986-10-13 | Nippon Steel Corp | Method and apparatus for adjusting plate shape of rolling material |
| JPS6293016A (en) * | 1985-10-18 | 1987-04-28 | Nippon Steel Corp | Adjusting device for plate shape of rolling stock |
| JPH03221204A (en) * | 1990-01-29 | 1991-09-30 | Nkk Corp | Shape control method of hot rolled sheet |
| DE19503363A1 (en) * | 1994-02-15 | 1995-09-07 | Siemens Ag | Control of properties of cold-rolled strips |
Non-Patent Citations (3)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 011, no. 074 (M-568), 6 March 1987 (1987-03-06) -& JP 61 229405 A (NIPPON STEEL CORP), 13 October 1986 (1986-10-13) * |
| PATENT ABSTRACTS OF JAPAN vol. 011, no. 301 (M-628), 30 September 1987 (1987-09-30) -& JP 62 093016 A (NIPPON STEEL CORP), 28 April 1987 (1987-04-28) * |
| PATENT ABSTRACTS OF JAPAN vol. 015, no. 501 (M-1193), 18 December 1991 (1991-12-18) -& JP 03 221204 A (NKK CORP), 30 September 1991 (1991-09-30) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110756592A (en) * | 2019-09-29 | 2020-02-07 | 武汉钢铁有限公司 | Method and device for controlling tail width of hot-rolled strip steel |
| CN110756592B (en) * | 2019-09-29 | 2021-06-01 | 武汉钢铁有限公司 | Method and device for controlling tail width of hot-rolled strip steel |
Also Published As
| Publication number | Publication date |
|---|---|
| ITMI971569A0 (en) | 1997-07-02 |
| ITMI971569A1 (en) | 1999-01-02 |
| EP0888832A3 (en) | 2000-03-22 |
| IT1292458B1 (en) | 1999-02-08 |
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