PH12014501766B1

PH12014501766B1 - Tandem rolling mill output method and installation with coiling carousel coupled with on-line inspection

Info

Publication number: PH12014501766B1
Application number: PH12014501766A
Authority: PH
Inventors: Emilie Fockedey; Andreas Koppe
Original assignee: Cockerill Maintenance And Ingenierie S A
Priority date: 2012-02-06
Filing date: 2014-08-06
Publication date: 2014-11-10
Also published as: EP2664390A1; RU2014135534A; ES2560378T3; BR112014016579A2; PH12014501766A1; RU2620222C2; BR112014016579A8; WO2013117351A1; CN104169017A; EP2664390B1; BR112014016579B1

Abstract

The present invention relates to a method for the coiling and on-line inspection of a continuously-rolled metal strip, involving a step of continuous coiling on at least one mandrel (10, 20) of a coiling station (3), preferably of carousel type, characterized by at least the following steps: the strip is cut by a first shears (4) situated before the coiling station, a last turn of the coil created (1, l', 1", etc.) pivoting about the axis of the mandrel (10) and dropping onto an insertion table (6) located in the continuation of the line and followed by an inspection table (8); the strip advances by a certain length on the insertion table (6) and the inspection table (8) and is cut by a second shears (7) to obtain a specimen; the specimen is inspected on the inspection table (8) so that faults can be detected. The present invention also relates to an installation for implementing this method.

Description

TANDEM ROLLING MILL OUTPUT METHOD AND INSTALLATION wie es

COILING CAROUSEL COUPLED WITH ON-LINE INSPECTION “I, Re ok

Field of the invention “¢,

The present invention relates to an industrial installation and method within the technical field of metal strip rolling mills, in particular of the tandem type, with a continuous-coiling station, having, at the end of rolling, an inspection table for the product rolled and being coiled.

Technological background and state of the art

Strip coiling by carousel tension coils, which will be more simply called carousel coiling, is well known as a system for final coiling in continuous rolling, both in a cold rolling mill and a hot rolling mill.

The coiling sequence is as follows: - the carousel is in the receiving position with the belt winder raised around mandrel no. 1 in the lower position, the free mandrel no. 2 being in the upper position at 180°; - once the strip is primed, the belt winder retracts and the coiling of coil no. 1 continues; - while the coiling continues, the entire carousel rotates 180° clockwise if the strip comes from the left (otherwise in the opposite direction), which places coil no. 1 undergoing coiling in the evacuation position and the free mandrel in the receiving position for the front end of the next strip to be coiled; - at the end of coiling of coil no. 1, the power is transferred to mandrel no. 2. Coil no. 1 is evacuated and the next coiling cycle begins.

The embodiment details of the means making up the coiling carousel such as the belt winder, the position of the mandrels, the mandrel support and evacuation device, etc. are well known by those skilled in the art.

One problem that arises is that of detecting, as early as possible in the manufacturing method, the faults that may be crippling for the rolled strip, for example faults of surface, geometry, thickness, flatness, etc. A separate inspection of the line cannot be contemplated, as it is disadvantageous in terms of lost time and hence from an economic standpoint.

Document JP 2000 254725 discloses a cold rolling installation comprising, mounted in that order on the line, a cold rolling mill, a moving shears that cuts the steel strip that is continuously produced by the rolling mill, a double-mandrel tension coiling apparatus, of the carousel-winder type, which continuously coils the steel strip. The

S carousel coiler is positioned downstream from and below the passing line of the cold rolling mill, and a surface-inspection apparatus that inspects the surface of the steel strip is situated downstream on an extension of the passing line that passes above the carousel coiler. The installation is provided with orienting means to direct the strip toward the carousel winder or, alternatively, toward the surface-inspection apparatus, which are positioned outside the moving shears.

Document EP 1,581,355 discloses a method for the successive rolling and coiling of a metal strip, in particular a steel strip, on a coiling mandrel that is rotated and capable of being moved away, in which the metal strip is inspected in longitudinal portions relative to rolling anomalies. The strip specimens are produced by a drum shears located after the last rolling stand, guided and stopped “on-line” inside the rolling line above a coiling station situated below the rolling line, on an inspection table, for a free visual inspection.

The coiling station is therefore situated under the plane of the inspection table, the latter being positioned “on-line” with the rolling line. Here again, the steel strip that emerges from the last rolling stand may be guided such that a deflecting unit, arranged at the input of the coiling station, can deflect the metal strip toward a coiling mandrel.

Generally, the inspection table is provided with gripping means that allow to turn the strip specimens over in order to inspect the other face as well.

Furthermore, after the inspection on the inspection table, the strip specimens are conveyed toward a shears that reduces them to pieces before they are collected by gravity in a waste tub or cart.

The solutions as described above have advantages over a separate off-line inspection: short access time and fast inspection, use of only one specimen of the strip and therefore no need to remove an entire coil from the material flow. They do, however, have the drawbacks of using an orienting system or deflector.

Aims of the invention

The present invention aims to allow a rapid and inexpensive inspection of rolled metal strips in a rolling installation working continuously, including the coiling station.

The invention also aims to produce a simple and reliable installation for performing this inspection.

In particular, the invention aims to provide an installation that does not have any orientation to direct the strip either toward the coiling carousel or toward the inspection table.

Main characteristic features of the invention

A first aspect of the present invention relates to a method for coiling and on-line inspection of a continuously-rolled metal strip, comprising a step of continuous coiling on at least one mandrel of a coiling station, preferably of the carousel type, characterized by at least the following steps: - the strip is cut by a first shears situated before the coiling, a last turn of the produced coil pivoting around the axis of the mandrel and falling onto an insertion table located in the extension of the line and followed by an inspection table; - the strip advances by a certain length on the insertion table and the inspection table and is cut by a second shears in order to obtain a specimen; - the specimen is inspected on the inspection table in order to detect faults.

According to preferred embodiments of the invention, the method comprises one or a suitable combination of the following steps: - after obtaining the specimen through the action of the second shears, the strip is recoiled backward and the coil is withdrawn and evacuated from the coiling station; - the strip specimen is inspected on the first face, then turned over and inspected on its second face; - after inspection, the specimen is conveyed from the inspection table to an evacuation table, at the end of which is a third shears that cuts the specimen into pieces that are then sent to a waste tub or similar member.

A second aspect of the present invention relates to an installation for coiling and on-line inspection of a continuously-rolled metal strip, comprising, downstream from the last rolling stand, a first shears, a coiling station on at least one mandrel and an inspection table for detecting faults on at least one face of the strip, wherein the coiling station and the inspection table are on-line and wherein the installation further comprises an insertion table situated on-line between the coiling station and the inspection table, associated with a second shears, which allows to produce a specimen with a predetermined length, once the strip has been cut by the first shears, pivoted around the axis of the mandrel while falling on the insertion table, and advanced on the insertion table and the inspection table.

Advantageously, the coiling station is a carousel station.

Also advantageously, the installation as in the invention comprises, at the level of the inspection table, gripping means with claws that allow to turn the specimen over, in order to inspect the other face thereof. 16 Brief description of the drawings

Figure 1 shows a longitudinal cross-sectional view of the carousel coiling station coupled with an inspection table according to one preferred embodiment of the present invention.

Figure 2 shows a longitudinal cross-sectional view of the carousel coiling station, according to another cross-section, parallel to that of Figure 1.

Description of a preferred embodiment of the invention

One preferred embodiment of the installation as in the invention is shown in

Figure 1.

The installation successively comprises, at the output of the last stand of the tandem rolling mill, in the motion direction of the metal strip (passing line 100): - afirst shears 4; - a carousel 3 equipped with a first upper right mandrel 10 for making a coil 1, 1’, 1", etc., provided with a mandrel-nose holder 9, a second lower left mandrel 20 for making a coil 2,2, 2", etc., provided with a mandrel-nose holder 11 and a belt winder 5 for priming the winding on the lower mandrel; - aninsertion table 6;

The mandrel-nose holder 11, supporting the left mandrel 20, is evacuated and the carousel 3 rotates by 180° clockwise.

Once the rotation of the carousel 3 is complete, the mandrel-nose holder 9 positions itself to support the new upper right mandrel 10. The coiling of the new coil "no. 2" 1' therefore continues on the new upper right mandrel 10 (which is the former left mandrel before rotation).

The mandrel-nose holder 11 positions itself to support the new lower left mandrel 20. The belt winder 5 used to prime the winding of the strip is placed in the operating position.

Step 3

The progression speed of the strip and the rotation speed of the upper right mandrel 10 are decreased.

The strip from coil "no. 2" 1'is cut at the shears 4, which generates a strip tail.

Coil "no. 3" 2' is coiled on the lower left mandrel 10. Once several turns have been coiled, the belt winder 5 is evacuated. The coiling speed increases.

At the end of coiling of coil "no. 2" 1', the last turn, making up the strip tail, falls on the insertion table 6. The strip tail of coil 1' advances by Y meters. The strip tail of coil 1 is cut at the shears 7 so as to obtain a specimen that has been inspected as described above.

The preceding specimen has left the inspection table 8. At the end of the evacuation table 12, the preceding specimen is cut into pieces approximately 1 m long at the shears 13, from which they are directed toward the waste tub 14. 7

LL

Claims

CLAIMS en

1. A method for coiling and on-line inspection of a continuously-rolled metal sthig,, comprising a step for continuous coiling on at least one mandrel (10, 20) of a coiling station (3), characterized by at least the following steps: - cutting the strip by a first shears (4) situated before the coiling, a last turn of the produced coil (1, 1’, 1”, etc.) pivoting around the axis of the mandrel (10) and falling onto an insertion table (6) located in the extension of the line and followed by an inspection table (8); - advancing the strip by a certain length on the insertion table (6) and the inspection table (8) and obtaining a specimen through the cutting the strip by a second shears (7); - inspecting the specimen on the inspection table (8) in order to detect faults.

2. The coiling and on-line inspection method as in Claim 1, wherein the coiling station (3) is of the carousel type.

3. The coiling and on-line inspection method as in Claim 1 or 2, wherein, after the step of obtaining of the specimen through the action of the second shears (7), the method further comprises the following steps : - recoiling the strip backward; - withdrawing and evacuating the coil (1, 1’, 1”, etc.) from the coiling station (3).

4, The coiling and on-line inspection method as in Claim 1 or 2, wherein the step of inspecting strip specimen comprises the following steps: - inspecting the specimen on a first face - turning over and inspecting the specimen on its second face.

5. The coiling and on-line inspection method as in Claim 1 or 2, wherein, after inspection, the method comprises the following steps: - conveying the specimen from the inspection table (8) to an evacuation table (12) - at the end of evacuation table (12), cutting the specimen into pieces by a third shears (13); - sending the pieces to a waste tub or similar member (14).

6. An installation for coiling and on-line inspection of a continuously-rolled metal strip, comprising, downstream from the last rolling stand, a first shears (4), a coiling station (3) on at least one mandrel (10, 20) and an inspection table (8) for detecting faults on at least one face of the strip, wherein the coiling station (3) and the inspection table (8) are on- 9 line and wherein the installation further comprises an insertion table (6) situated on-line between the coiling station (3) and the inspection table, (8), associated with a second shears (7), which allows to produce a specimen with a predetermined length, once the strip has been cut by the first shears (4), pivoted around the axis of the mandrel (10) while falling on the insertion table (6), and advanced on the insertion table (6) and the inspection table (8).

7. The installation as in Claim 6, wherein the coiling station (3) is a carousel station.

8. The installation as in Claim 6, comprising, at the level of the inspection table (8), gripping means with claws (8’, 8”) that allow to turn the specimen over, in order to inspect the other face thereof.

-.