Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
• • 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
  • B21B1/30—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 in a non-continuous process
  • B21B1/32—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 in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
  • B21B1/36—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 in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
• • 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
  • B21B2013/025—Quarto, four-high stands
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B2015/0057—Coiling the rolled product
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B2015/0064—Uncoiling the rolled product
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2261/00—Product parameters
  • B21B2261/02—Transverse dimensions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
  • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips

Definitions

• the invention relates to rolling mills. More particularly, the subject of the invention is a method and an installation for inspecting the quality of a sheet metal strip after rolling.
• the laminated sheet metal strip may have certain appearance defects which may be due, for example, to a slight variation in thickness in the transverse direction, resulting from the deformation and the wear of the rolls and / or the ceding of the cage, or marks left by the working rolls, some defects may also be due to the support rolls or to the cage itself.
• the inspection length corresponds to the period of the marks produced in cage 1a upstream, from which band undergoes the greatest elongation by passing into the following cages.
• the inspection can be done in a particular installation where are made some reels to inspect, after their production by the rolling mill.
• the inspection facility includes an inspection and a horizontal table for unrolling a length of product corresponding to the length of inspection, on which the operator can perform the observation, the tracking, the layout or any another operation to take into account the marks on both sides of the sample used for the inspection.
• Such an inspection facility is expensive to produce and also to operate. Indeed, it is necessary to remove a reel from the produced batch, to convey it towards the inspection facility, then to inspect it before continuing its routing. However, the rolling mill continues to produce during the inspection of a rolled strip sample, and the detection of a large defect then results in the rolled sheet strips produced in the gap being subsequently discarded.
• the winding installation usually comprises at least two cores operating alternately, for example on a carousel-type winder, and the band is cut in flight, at the end of the winding on a mandrel, to continue winding on another mandrel. Two successive cuts can then be made which are spaced so as to take an inspection length, which is then conveyed to an inspection table by means of switching and drive systems. This length of inspection has undergone all rolling stages, as the rest of the band and its surface condition is therefore well representative of that of the band.
• Such a method is, however, not applicable to a reversible rolling installation comprising at least one rolling stand disposed between two winder / unwinder devices between which the band alternately circulates in one direction and in the other, each winding device / unwinder serving, according to the direction of rolling, of the winder downstream of the rolling stand and uncoiler upstream.
• the rolling is not continuous, it is not useful to have a carousel winder, with cutting theft of the tape.
• the downstream coiler at the end of the last pass, can be placed on one side or the other of the rolling mill.
• the length of inspection is simply taken on the band at the end of the last pass, on one side or the other of the rolling mill.
• this inspection length must then be rejected. Or 1 in the reverse rolling, it is already necessary to discard a substantial length of the tape.
• service length a certain length of strip that can be called “service length” is wound into several turns on each mandrel.
• this length of service used to tension the strip consists of an extension welded to each end of the strip. This can then be rolled practically over its entire length, but the welding of the two extensions and their removal takes a certain time and decreases the productivity of the installation.
• the coil is of great length, it seems It is preferable to sacrifice at each end of the strip a service length which is not rolled to the desired thickness and must therefore be discarded.
• such a reversible rolling plant comprises, in addition to the two devices winder / unwinder, a so-called "first pass" unwinder capable of taking coils wound on themselves and without traction.
• a coil being placed on the first pass unroller the product is unwound from it, in a first direction of travel, by passing his head in the cage to engage on the device winder / unwinder placed of the other side of the cage and thus serving, of coiler.
• the product is then wound almost completely on this winder until its end, forming the tail of the strip, leaves the unroller, this first pass being made, therefore, without rolling.
• the rolling can then be done alternately in., One way and the other between the two winders / unwinders that serve, alternately, winder and uncoiler, but, to maintain each pass the tension necessary for rolling, it is necessary to keep on each mandrel a length of service that is not laminated. At the end of the last pass, it is necessary to eliminate the length of service at the tail of the tape and which does not have the required qualities. Similarly, the service length at the head of the strip and wound inside the coil, should be eliminated at the end of the course of the latter.
• a rolled coil is therefore laminated to the desired thickness only on a central useful portion framed by two non-rolled service lengths, which represent a loss called "put to the mile".
• this inspection loss usually has to be added to the length of inspection which is taken from the useful part of the strip having the required qualities. Such an inspection process therefore increases the feathering.
• the object of the invention is to overcome these drawbacks in a reversible rolling mill by means of a new method allowing an on-line inspection while maintaining a high production yield, the rejected length not exceeding the two lengths of service which must remain wound. on each mandrel and therefore do not have the required thickness.
• the invention also covers a rolling installation for implementing the method.
• the invention therefore applies, in a general manner, to a reversible rolling installation, comprising at least one rolling stand disposed between two reel / unwinder devices each having a mandrel on which a service length of the strip is wound. in several turns for the tensioning of the strip, the rolling being carried out in several passes with maintenance of the winding, on each mandrel, of the length of service, the strip being laminated to the desired thickness on a useful part lying between the two lengths of service.
• the length of upstream service is completely unrolled from the upstream uncoiler and is subjected to at least one rolling pass, the strip then being cut near the end of its useful part, so as to release, at its rear end in the direction of the last passes, a length at least equal to a necessary inspection length, at least a portion of which corresponds to the upstream service length which has been laminated at least once and thus gives an image of the appearance defects of the useful part.
• the roll to be rolled is often first laid on a simple unwinder placed on one side of the rolling mill and from which the strip is unwound to pass into the rolling mill and attach to the reel / unwinder placed the other side.
• the band goes to the side of the unwinder. It is advantageous, at the end of the rolling of the upstream service length, that the rear end thereof is kept tight between the working rolls and that the direction of rotation of said rolls is reversed so as to return back a strip length sufficient to take an inspection length separated from the strip by the cutting thereof upstream of the cage, in the direction of the last pass, said length taken being placed on an inspection table and the band is returned in the direction of the last pass to completely wind on the downstream winder.
• the inspection length is rolled twice, first in the direction of the last pass and then in the opposite direction, before being cut and sent to the inspection table which is placed on the opposite side to the unroller, compared to the rolling mill.
• the downstream coil on which the strip is wound is placed on the same side of the rolling mill as the inspection table.
• the strip can then be cut at a distance from its rear end corresponding to the desired inspection length, this inspection length being laminated once and sent directly to the inspection table placed on the same side of the rolling mill.
• the invention thus makes it possible to take from the strip an inspection length of which at least the greater part corresponds to one of the two lengths of service which remains wound on the mandrels of each of the reels / unwinders, this length of service passing at least once between the rolls of the mill, which is sufficient to give an image of possible defects produced by said rolls on the useful length of the strip.
• the inspection length is therefore not taken from the useful part but from the tail of the strip, which in any case should have been discarded since it had not been laminated to the thickness. required.
• the invention applies to any reversible mill comprising at least one cage placed between two winder / unwinder devices, but it is particularly advantageous in the case of a reversible rolling mill with two rolling stands apart. one in the other because, in this case, the feathering is increased by the fact that the length of the tape included at the end of each pass, between the two cages has been rolled only once in the cage upstream and is therefore not at the required thickness.
• the length to be discarded then comprises the remaining service length wound on the mandrel to which is added the distance between the two cages and the total length to be rejected is normally greater than the length of inspection required, which can, thus, be easily removed from the tail of the rolled strip at least once at the last pass.
• the invention thus makes it possible to carry out an online inspection without taking an inspection length on the useful part of the strip and, consequently, to keep a high production yield.
• the implementation of the method can be done at a reduced cost and on existing reversible rolling mills since cutting, routing and inspection means are used which, in any case, were necessary.
• FIG. 1 is a schematic representation of a reversible rolling plant according to the invention for carrying out the inspection method according to the invention
• - Figures 2a to 2j are schematic views of the mill of Figure 1 in different steps of the method according to the invention.
• FIG. 1 represents a rolling mill with two reversible cages, in which the rolling mill 1 comprises two rolling stands 3 and 5 spaced apart from one another and placed between two winder / unwinder devices, respectively 12 and 13.
• the rolling mill 1 is a rolling mill reversible for rolling a strip of sheet metal in both directions of scrolling ie from right to left in a first direction of travel and from left to right in the opposite direction.
• the rolling mill 1 is, in addition, associated with a first-pass unroller 1 1 adapted to receive a coil 21.
• This coil 21 is constituted by a sheet metal strip having an initial thickness that it is desired to reduce by rolling to obtain a sheet metal strip having a required final thickness.
• the sheet metal strip is wound on itself to form the coil 21 and is first placed on the unroller 1 1 which has no mandrel.
• Means 31 make it possible to grip the head of the sheet metal strip and to guide it to pass between the rolls of the two stands 3 and 5 while proceeding to the left, the head of the band being fixed on the reel / unwinder 12 placed on the second side of the mill 1 and which then serves as a winder for winding the sheet metal strip. It scrolls from the right to the.
• an upstream decontamination device 31 of the strip and upstream cutting shears 32 are located just upstream of the rolling mill 1, in the first direction of travel.
• the upstream cage 3 comprises presses 33 making it possible to engage the leading end of the strip to be rolled between the roll trains of the upstream cage 3.
• the stands 3 and 5 are of the quarto type, that is to say that they respectively comprise two working cylinders 30, 50 of small radius and two retaining cylinders 39, 59 of large radius.
• FIG. 1 has been simplified for the sake of clarity, but the rolling mill 1 also comprises all known rolling means, such as means for cooling the rolls, measuring the tension of the strip, cooling the strip or holding it, as well as deflection cylinders 45 for guiding the band.
• rolling means such as means for cooling the rolls, measuring the tension of the strip, cooling the strip or holding it, as well as deflection cylinders 45 for guiding the band.
• the downstream casing 5 is identical to the upstream casing 3, except that the decontamination device 51 and the band engagement presses 53 are arranged in downstream of the second cage 5, to allow the operation of the rolling mill in the opposite direction.
• a switching device 60 guides the strip first to an overhead conveyor and then to an inspection conveyor constituting the inspection table 62.
• the rolling installation Downstream of the inspection table 62, the rolling installation comprises a tumbler type turning device 65 for returning the sample to inspect it on its other side.
• the inspected sample is rejected in a bucket 69, if necessary after being cut into pieces by means of downstream shears 68.
• the coils 11, 13 and 12 are carried by jacks allowing their loading and unloading.
• the entire installation is based on concrete foundations.
• a metal frame allows to maintain and support the various components of the installation.
• FIGS. 2a to 2j shows schematically the rolling plant of FIG. 1, the reference numerals having been taken over to indicate the same constituent elements.
• the upstream 3 and downstream 5 cages (in the first direction of travel) are of the quarto type comprising two working cylinders and two support cylinders but could be of any other type.
• the first winder passes 12 and the second winder passes 13 are schematized with their mandrel unlike the first pass unroller 1 1 which does not.
• the coils 21, 22 and 23 are shown at different stages of the inspection process according to the invention.
• a rolling sheet metal coil 21 is disposed on the first-pass unrolling device 11 and then unrolled.
• the leading end 101 corresponding to the front end of the sheet metal strip 100 is engaged between the working rolls of the upstream stand 3. Once the band 100 is engaged, the working rolls of the upstream stand 3 are used to to apply. a friction force for driving the band 100. The leading end 101 then moves in a first direction of travel towards the downstream cage 5 as indicated by the arrow, that is to say from right to left.
• FIG. 2b the leading end 101, after engagement between the rolls of the second stand 5, has been conventionally fixed to the mandrel of the first pass winder 12.
• the work rolls of stands 3 and 5 are tight. on the web and rotated to control the unwinding of the sheet metal strip 100 which, at the same time, is wrapped around the mandrel of the first pass winder 12 (Fig. 2c).
• the coil 21 is unwound while the coil 22 is wound.
• the first unrolling pass 1 1 does not have a mandrel, it is impossible to apply a voltage on the band 100 during the first pass. Consequently, the desired reduction rate can not be achieved during this first scrolling pass.
• Figure 2d shows schematically the end of the first pass.
• the spool 21 is completely unwound and the sheet metal strip 100 is wrapped around the mandrel of the first spooler 12 forming a spool 22.
• the first pass ends when the tail end 102 of the strip 100 is near the spool. upstream cage 3. It is advantageous not to disengage the tail end 102 at the end of the first pass. By disengagement, it is meant that the tail end 102 goes beyond the downstream cage 5.
• the first pass is stopped at least when the tail end 102 is between the cages. Of preferably, the first pass is stopped when the tail end 102 is still upstream of the upstream cage 3.
• the direction of operation of the mill 1 is then reversed so as to control the scrolling of the sheet metal strip 100 in the opposite direction indicated by the arrow shown in FIG. 2e.
• the working rolls of cages 3 and 5 are simply tightened to control the movement of web 100 from left to right until its front end 102 can be fixed to the mandrel of the machine.
• second pass winder 13 is simply tightened to control the movement of web 100 from left to right until its front end 102 can be fixed to the mandrel of the machine.
• the strip 100 taking place from the coil 22 which thus functions as a de-borer but can be braked so as to put the strip under tension and carry out the rolling between the rolls of the two stands 5 and 3, the spacing between the rolls being adjusted to achieve a suitable reduction ratio.
• the strip is wound to form a coil 23 on the reel / unwinder 13 serving as a winder. It is then possible to carry out the rolling in successive passes between the two winders, first pass 12 and second pass 13, which are equipped with the necessary means allowing the application of a torque on their respective mandrels in order to keep the sheet metal strip 100 under tension. .
• Significant reduction rates can be achieved in the second pass.
• the number N of passes of the rolling cycle depends on the reduction rate to be achieved in order to obtain the desired final thickness.
• the two lengths of service which must remain wound on the mandrels of the two reels / unwinders 12, 13 not being rolled at each pass.
• the inspection will be carried out on a section taken on one of these two lengths of service which should, in any case, be rejected. It must, however, that this section is an image of the useful part to present the same aspect and, in particular, the same marks and imprints of the cylinders.
• This section 105 corresponding, at least for the most part, to the length of service, is passed twice between the working cylinders, respectively in the first direction of travel, from left to right, in FIG. the second direction of scrolling, from right to left, in Figures 2h, 2i.
• the band has remained energized, in one direction or the other, between the two stands 5 and 3.
• This part 105 therefore undergoes, when its passage between the cylinders, the same marks as the useful part of the band, these marks reproducing identically to each pass.
• the sampled section 105 therefore has the same appearance as the strip, which makes it possible to check the quality of the latter.
• the sample 105 is positioned on the inspection table where the actual inspection takes place, possibly on both sides by inverting the sample 105.
• the coil 23 is removed from the installation. rolling and fed to, for example, another facility for further processing.
• a new coil 21 'consisting of a new sheet metal strip 100.' The rolling mill is loaded onto the first-pass unroller 11 and its leading end 101 'is engaged in the mill 1 so as to prepare the next rolling cycle.
• the inspection method according to the invention therefore takes advantage of the fact that the non-rolled service length, which must be rejected in any case, is used as an inspection sample because it comprises the marks and impressions of the rolls. Indeed, although not rolled to the right thickness, the unlaminated length passes between the cylinders which leave their marks on both sides.
• the length of the inspection shall be chosen so as to include at least one period of each of the marks of the rolling mill roll trains. Thus, the inspection length comprises at least the non-rolled length, but can also be greater if the period of one of the roll trains requires it.
• the invention thus makes it possible to inspect the quality of rolling on-line by minimizing the losses of rolled material to the desired thickness, since the inspection is carried out on a part of the sheet that should have been discarded, whatever happens. not being the right thickness.
• the inspection operation does not consume time. Indeed, as shown in Figure 2j, when the rolling inspection of a first cycle takes place, the next rolling cycle can be prepared by engaging for example the leading end 101 'of the next coil 21'. The handling of the coil 23 produced is also done synchronously with the inspection step.
• the implementation of the inspection method as described above does not require or few modifications of existing facilities.
• shears may be located upstream or downstream of the rolling mill, possibly between the stands of the rolling mill.
• shears may be disposed only downstream of the mill 1, once the inspection sample has been separated from the remainder of the sheet metal strip 100, the mill can no longer serve as a means of driving the sheet. sample to the inspection table. It would then be necessary to have own drive means capable of moving the sample on the inspection table.
• the inspection table may be located downstream of the rolling mill 1 in the first direction of scrolling, and will inspect, a sample corresponding to the service length wound on the reel / unwinder 13 and, lying in line in the first direction of travel.
• the inspection table can be placed on the same side as the winder 12 on which the band is wound. If there is a shear between the second cage 5 and the winder 12, the latter can cut the strip at a distance from its rear end 102 at least equal to the required inspection length.
• the strip can then be wound completely on the reel 12 and its rear part, which constitutes the inspection length, remains tight between the rolls of the stands 5 and 3 which drive it to the left, in the first direction of travel so that to point it towards the inspection table.
• the inspection section only passes once between the rolls of the two stands 5 and 3, but this passage is sufficient for the rolls to print and the inspection length has a representative appearance of that of the useful part of the band.
• the inspection length remains tight between the two cages, even after cutting the strip.
• the method according to the invention is, however, applicable to a rolling mill comprising a single reversible cage.
• the rear portion of the strip is no longer energized but the passage between the working cylinders which remain tight on the strip, allows to print the same marks on the two faces thereof, the inspection length taken from the rear end of the strip and constituting the length of service, having the same appearance as the useful part of the strip.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Winding, Rewinding, Material Storage Devices (AREA)

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• 2005
  • 2005-07-22 FR FR0552283A patent/FR2888763B1/fr not_active Expired - Fee Related
• 2006
  • 2006-07-21 EP EP06794198A patent/EP1917113B1/de not_active Expired - Fee Related
  • 2006-07-21 US US11/996,469 patent/US7980109B2/en not_active Expired - Fee Related
  • 2006-07-21 BR BRPI0613609-5A patent/BRPI0613609A2/pt not_active IP Right Cessation
  • 2006-07-21 CN CN2006800268201A patent/CN101227985B/zh not_active Expired - Fee Related
  • 2006-07-21 WO PCT/FR2006/001793 patent/WO2007010148A1/fr not_active Application Discontinuation
  • 2006-07-21 DE DE602006012689T patent/DE602006012689D1/de active Active
  • 2006-07-21 ES ES06794198T patent/ES2339279T3/es active Active

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