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
  • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
• • 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
  • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
  • B21B31/10—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by horizontally displacing, i.e. horizontal roll changing

Definitions

• a rolling mill comprises, inside a cage, at least two cylinders rotatably mounted around parallel axes and placed in a substantially vertical plane.
• “Duo” cages for example, have only two cylinders between which the product to be rolled passes.
• the product to be rolled passes between two relatively small diameter working cylinders and is supported directly on two support cylinders.
• “Sexto” cages intermediate cylinders are interposed between each working cylinder and the corresponding support cylinder.
• rolling mills for example of the “Sendzimir” type which include a large number of rolls or the so-called “Z-High” rolling mills in which each working roll is associated with lateral support rollers, the 'set being placed in an insert.
• the cylinders were disassembled cantilevered by a system called load-bearing bars, comprising a cylinder support member balanced by a counterweight.
• each cylinder is rotatably mounted, at its ends, on centering bearings housed in two chocks on which support means for adjusting the height of the cylinders, each chock being slidably mounted along guide faces parallel to a clamping plane passing through the axes of the working rolls.
• chocks are generally provided with rollers which roll on rails extending between the two columns of the cage, parallel to the axes of the cylinders.
• the upper cylinder is made to rest on the chocks of the lower cylinder which roll on two rails placed on either side of the clamping plane.
• each carriage comprises two pairs of rails which are placed in the extension of the two pairs of rails of the cage.
• the present invention makes it possible to solve all of these problems thanks to a replacement device which, without dismantling the rails, makes it possible to completely free the space between the columns of the cage, during the rolling operations.
• the invention therefore generally relates to a device for dismantling rolls for a rolling mill in which the rolls are moved in translation, parallel to their axis, between a rolling position between the columns of the cage and a dismounting position. separated from the outside of the cage, bearing, successively, on at least one pair of internal rails extending respectively, on each side of the clamping plane, between the corresponding uprights of each column and extended by at least one pair of external rails extending outside the cage, at least on a dismantling side, the two chocks of the cylinder to be dismantled being provided with movable support members on said internal and external rails.
• each internal rail consists of two sections, each extending over a limited length, between two ends, respectively internal and external and mounted sliding, respectively, on the two columns of the stand, parallel to the axis of the cylinder and the rolling mill comprises means for controlling the sliding of the two sections of each internal rail between a rolling position for which each section extends substantially over the width of the corresponding column and a cylinder disassembly position for which the two sections are advanced towards one another, in the interval between the two columns, the internal ends of said sections being separated by a free space.
• each movable support member of a chock is spaced from the median plane thereof a distance greater than the distance between said median plane and the end of the corresponding rail section when the latter is in the rolling position and at least the chock holding the end of the cylinder opposite to the dismantling side is equipped, on each side of the clamping plane, with two movable support members spaced from one another, on either side of the median plane of the chock, a distance greater than the length of the existing free space, in the disassembly position of the cylinder, between the internal ends, facing each other, of the two corresponding internal rail sections.
• the two chocks of the cylinder to be dismantled are each provided, on each side of the clamping plane, with a pair of movable support members spaced apart from each other by a greater distance to the length of the corresponding rail section.
• These support members are each mounted at the end of an arm fixed on the corresponding side of the chock and extend axially towards the outside of the chock. , so as to place the support member at the desired distance from the median plane of the chock.
• the device comprises two pairs of rail sections mounted respectively on the two columns of the cage at the same dismantling level, so as to form two internal rails, on either side of the clamping plane.
• the device comprises four pairs of sections rails mounted respectively, at two levels of disassembly, on the two columns of the cage, so as to form, at each level, two internal rails extending respectively on either side of the clamping plane.
• Such a device therefore makes it possible, while keeping the strip engaged, to translate, separately or simultaneously, the two working rolls by keeping them apart on either side of the rolling plane.
• a similar arrangement makes it possible, in a "Z-High" type rolling mill, to disassemble and replace, separately or simultaneously, the inserts each comprising a working cylinder and two lateral support rollers.
• Other arrangements are however possible and one could, for example in a "Sexto" rolling mill, use eight pairs of rail sections mounted respectively at four levels for dismantling the working rolls and the intermediate rolls.
• the invention also covers the process for implementing such a dismantling device.
• the sections of rails placed on one side before disassembly are first ordered to slide towards the inside of the cage, and a Replacement carriage fitted with external rails which are placed in the extension of the sections of internal rails thus advanced.
• We then control the translation of the cylinder to be replaced which rests on the sections of internal rails and we then advance, towards the inside of the cage, the sections of rails mounted on the rear column.
• the rear chock placed on the side opposite to the carriage thus bears, successively on the rear sections then on the front sections by its two separated support members, crossing the free space between said sections.
• the rolling mill is particularly advantageous for the rolling mill to be equipped with C hydraulic blocks comprising, on either side of the rolling plane, two projecting parts at the ends of which are provided with lateral guide faces of the working chocks, these being provided with bearing ears offset towards the rolling plane and engaging in a central notch of each hydraulic block, formed between the projecting parts of that -this.
• each column can, in this case, be arranged along the ends of the projecting parts of the hydraulic blocks and each rail is housed in a notch formed on a part of the height of the corresponding lateral side of the chock while retaining, on said lateral side and on the end of the projecting part, guide faces sliding one on the other and having a height compatible with the possibilities of level adjustment of the chock.
• Each rail section is thus slidably mounted axially between the end of the projecting part of the hydraulic block and the bottom of the notch formed on the lateral side of the chock, said bottom and the corresponding face of the rail being provided with plates. wear which slide one on the other, on the one hand in the axial direction during displacements of the rail section and, on the other hand, in the vertical direction when adjusting the level of the chock, so as to constitute an additional means of lateral support of the chock.
• Figure 1 shows, in elevation, the conventional arrangement of a rolling stand equipped with various ancillary members.
• Figure 2 is a top view of a rolling mill equipped with the device according to the invention, in section along the rolling plane P-i.
• FIG. 3 is a view in elevation and partially in section along the line III-III of FIG. 2.
• FIG. 4 is a view in section along the line IV-IV of FIG. 3.
• FIG. 5 schematically shows the sequence for dismantling a cylinder.
• a conventional rolling mill of the quarto type comprising a cage 1, two working rolls respectively lower 2 and upper 2 ', and two support rolls 15, 15'.
• Each cylinder 2, 2 ', 15, 15' is rotatably mounted, at its ends, on two bearings housed in chocks 3, 3 ', 16, 16' and centered on a median plane Q orthogonal to the axis of the cylinder.
• the holding cage 1 comprises two spaced apart columns 10 each comprising a window 11 bounded by two uprights 12a, 12b of the column and in which the chocks of the cylinders are threaded which are held laterally by sliding guide faces 13 parallel to a clamping plane P 2 passing substantially through the axes of the cylinders, so as to allow the height adjustment of the cylinders under the action of clamping means 14 bearing on the columns 10 of the cage and means (not shown) for adjusting the cylinder levels.
• a rolling stand is usually equipped with a number of ancillary members which are placed at the level of the two working rolls, close to the latter, on either side of the plane of the strip to be laminated M.
• such a rolling stand may comprise, on each side of the clamping plane P 2 , an engagement table A, spray bars B placed as close as possible to the cylinders 2, 2 ', a tensiometer roller C , a bar feed roller D mounted on a device which makes it possible to move it towards or away from the strip, as well as guard plates E intended to protect the cylinders in the event of a strip break.
• All these ancillary members and, in particular, the spray bars B and the guard plates E must be placed near the working cylinders 2, 2 'in a reduced space vertically limited by the chocks 16, 16' of the cylinders of support 15, 15 'and laterally by the two columns 10, 100 of the cage. It is therefore difficult to place in addition, in this space, rails allowing the disassembly of the cylinders.
• the chocks of the working rolls are of the conventional type comprising two support ears placed in the central part of the chock and on which act, in opposite directions, camber cylinders, respectively positive and negative, placed on each side of the ear.
• Each hydraulic block therefore has an E-shape comprising a central support part for the positive camber cylinders and two end parts, respectively lower and upper, for supporting the negative camber cylinders.
• each hydraulic block having a C shape comprising only two parts projecting guide of the working chocks 3, 3 ', in which are housed the camber cylinders, respectively positive and negative, of the cylinders 2, 2'.
• This preferred embodiment has therefore been shown in the figures.
• the support ears of each chock 3 have a stage profile comprising a projecting part 31 for supporting the positive and negative bending cylinders of the cylinder 2 considered and a free space 32 for passage of the positive camber cylinder 2 'placed on the other side of the rolling plane.
• the support parts 31 a, 31 b placed on either side of the clamping plane P 2 are offset, respectively, in front and behind the median plane Q of the chock, so as to ensure the centering of the result of the applied forces.
• such an arrangement has the particular advantage of reducing the overall height of the hydraulic blocks and chocks, because the bearing ears of the two chocks can be placed near the plane of rolling, in the central notch of each C-shaped hydraulic block
• rollers for chocks are often mounted at the end of the bearing lugs and the disassembly rails must therefore be placed between the projecting parts of the hydraulic blocks carrying the camber cylinders.
• the assembly is quite bulky and can hardly be accommodated between the uprights of each column of the cage, in the case, for example, of the modernization of an existing rolling mill.
• FIG. 3 is an elevation view of the hydraulic blocks and chocks, partially in section along the line III-III in FIG. 2.
• Figure 3 shows, by way of example, worn cylinders on its left side and new cylinders on its right side.
• each hydraulic block 4 has two projecting parts, respectively lower 41 and upper 41 ', on either side of a central notch 42 into which the ears 31, 31' of the two chocks 3, 3 'penetrate.
• projecting parts 41, 41 ′ are housed the bending cylinders, respectively positive 43 and negative 44 of the cylinders.
• the positive camber cylinder 43 of the lower chock 3 is placed in the upper part 41 'of the hydraulic block 4 and therefore crosses the rolling plane Pi to bear on the ear 31 of the lower chock 3 passing through a recess 32 of the upper chock 3 '. Due to the offset, towards the rolling plane Pi, of the ears 31, the lateral guide faces of the chocks, formed at the ends of the projecting parts 41, 41 ′, can extend practically over the entire height of the chock. This particular arrangement facilitates the positioning of the support rails 5, 5 ′ inside the hydraulic blocks.
• the support rails 5, 5 ′ can be placed at the level of the protruding parts 41, 41 ′ for guiding the chocks 3, 3 ′, the rollers 7 being mounted directly on the lateral sides 34 of the chocks and not, as before, at the ends of the support ears.
• the support rail 5 ' the height hi of which is determined so as to give it the necessary resistance, extends along the end 43 of the projecting part 41' of the hydraulic block 4, leaving a side 45 of lateral guide of the chock, in contact with the guide face 35 of the chock and extending over a height h 2 compatible with the need to maintain the chock laterally over the entire height of adjustment level, the two guide faces in contact 35, 45 being provided with wear plates.
• the lower chock 3 is produced in a similar manner taking into account, however, the mounting of the rollers 7 for supporting the chocks which, as usually have to roll on the rails 5, 5 'for disassembly of the cylinders and are therefore placed above the latter.
• the rollers 7' can be placed at the upper part of the lateral side 34, the lower part of which forms the guide face 35.
• each support rail 5 consists of two sections mounted respectively on the two columns 10 and 100 of the cage, as shown in Figure 2. Each cylinder is therefore associated with two pairs of rail sections placed respectively on each column 10, 100, on either side of the clamping plane P 2 .
• the lower working cylinder 2 carried, at its ends, by two chocks, respectively front 3 and rear 30, guided respectively in the two columns 10, 100 of the cage, is associated with two pairs sections of rails, respectively 51 a, 51 b carried by the front column 10 and 52a, 52b carried by the rear column 100. Since the disassembly can be done with the band engaged, the upper cylinder 2 ′ is also associated with two pairs of rail sections, respectively 51 ′ a, 51 ′ b carried by the front column 10 and 52 ′ a, 52 ′ b carried by the rear column 100.
• each rail section 51, 51 ' is slidably mounted, parallel to the axis of the cylinder, on a slide 6, 6' formed on the corresponding projecting part 41, 41 'of the hydraulic block 4.
• each section of rail can slide axially between a retracted position for which the rail section 51, 52 has returned to the level of the column 10, 100 corresponding to the cage and an advanced position, shown in phantom in the figure, for which the two sections 51, 52 of each rail 5 extend towards one another in the interval 17 between the two columns 10, 100 of the cage.
• each rail 5 into two sections of limited length, it is possible to place said sections at the level of the projecting parts 41, 41 ′, between the ends thereof and the lateral sides 34 of the chocks, without hampering the vertical displacements of the cylinder.
• the rollers 7 for supporting each chock are spaced from the median plane Q thereof a distance greater than the distance between said median plane and the corresponding end of the section of rail so that it does not risk interfering with the movements of the roller 7 linked to the chock, during the height adjustments thereof.
• FIG. 4 is a longitudinal sectional view of the rear chocks 30, 30 'placed on the side opposite to the disassembly side of the cylinders.
• each rear chock 30 is supported, on each side of the clamping plane P 2 , by two rollers spaced apart on either side of the median plane Q of the chock, respectively a external roller 72 placed outside the cage and an internal roller 72 'placed inside, in the interval 17 between the two columns 10, 100.
• Each roller 72 is mounted at the end of an arm 73 fixed on the side of the chock and extending inward or outward so that the two rollers 72, 72 'are spaced from each other by a distance d greater than the length I of the rail section 52.
• the rollers 72, 72 ' which are placed beyond the ends, respectively external 54 and internal 54' of the corresponding rail section 52, do not hinder the vertical movements of the chock 3 when the rail section 52 is moved back to the rolling position.
• each rail section 51, 52 can be threaded without play between the end face 46 of the projecting part 41, 41 'and the bottom 36 of the notch 33 formed on the lateral side 34 of the chock.
• the two contacting faces 56 of the rail section 51, 52 and 36 of the chock 3 can cooperate with the guide faces 35, 45 for the lateral holding of the chock and are, for this purpose, provided with plates wear sliding one on the other, on the one hand during the vertical movements of the chock and, on the other hand, during the axial movements of the rail section 51, 52.
• the front chock 3, 3 ′ placed at the other end of the cylinder 2, on the disassembly side and threaded into the column 10 of the cage is also provided, on each side of the clamping plane P 2 , with two respectively external 71 and internal 71 'rollers spaced apart by a distance d greater than the length of the corresponding rail section 52.
• the two chocks, 3, 30 of each cylinder 2 are identical.
• the front chock 3 could be supported by a single rear roller 71 ', mounted on an arm extending towards the inside of the cage. In their disassembly position shown in phantom in the figure
• the rail sections are advanced cantilevered and must therefore remain embedded on the slides 6 over a length sufficient to support the weight of the cylinder.
• the length I of the rail sections and the spacing d between the support rollers of the chock must therefore be determined, on the one hand to maintain a sufficient embedding length of each section and, on the other hand so that l the spacing of the rollers is greater than the distance e between the ends of two sections of rails so as to allow the disassembly of the cylinder by rolling successively on the two sections, as will be seen below with reference to the diagram in FIG. 5.
• all the arrangements which have just been described for the lower cylinder 2 with reference to FIG. 2 are identical for the upper cylinder 2 ', the latter also being associated with two pairs of rail sections, respectively 51' a, 52'a and 51 'b, 52'b. It is advantageous to simultaneously control the sliding of all of the sections of rails placed on the same column, between the retracted rolling position and the advanced disassembly position.
• the two rail sections respectively lower 51 and upper 51 'are each connected by an arm 81, 81' to a connection plate 8 which extends vertically along the hydraulic block 4 and on which the rod of a jack 82 rests, the body of which is articulated on the hydraulic block 4, the latter being provided, in its central part, with a recess 47 in which extends horizontally the jack 82.
• this connecting device 8 is advantageously provided, in its central part, with a guide plate 83 which extends horizontally over the same length as the rail sections 51 and which slide in a horizontal slide 61, arranged on the hydraulic block 4.
• This central slide 61 cooperates with the two slides 6, 6 ′ for guiding the rail sections 51, 51 ′ for the cantilever maintenance of the latter in their advanced disassembly position.
• FIG. 5 shows the successive sequences of disassembly of the upper cylinder 2 ′, these sequences being, obviously, the same for the lower cylinder 2.
• the two working rolls 2, 2 ' are in the rolling position of a product M.
• the spacing of their chocks 3, 3' therefore depends on the thickness of the product and the degree of wear of the cylinders 2, 2 '.
• the rollers 71, 72 of the upper chocks 3'a, 3'b may possibly be at the level of the upper rail sections 51 ', 52'. Indeed, as we have seen, the distance d between the rollers 71, 72 of each chock 3'a, 3'b is greater than the length I of the corresponding rail section 51 ', 52' and the latter it therefore does not oppose the vertical movements of the chock under the action of the adjustment cylinders 42, 43.
• the cylinders 2, 2 ′ are worn and need to be replaced, they are moved apart on either side of the product to be laminated M, each at its dismantling level, in the position shown in FIG. 5b.
• the rollers 71, 72 are then located just above the level of the upper faces of the rail sections 51, 52.
• the sections of rails 52 ′ placed on the side opposite to the dismantling side are slightly moved back so as to be placed below the rear rollers 72 of the corresponding chock 30 ′ of the cylinder 2 ′.
• the latter are then advanced into the position shown in FIG. 5d for which the internal ends, facing 53 ′, 54 ′ of the rail sections 51 ′, 52 ′ are separated by a space of length e less than the distance d between the two rollers 72, 72 '.
• the rear chock 30 ′ can therefore cross this space by bearing, first on the rear section 52 ′ by its rear roller 72 then on the front section 51 ′ by its front roller 72 ′.
• the auxiliary carriage can be equipped with two boxes each provided with two pairs of outer rails 55 placed at the two dismantling levels, respectively a free box for the reception of used cylinders and a reserve box comprising two new cylinders which are introduced into the cage by performing the same sequences in reverse order.
• the chocks 30, 30 'placed on the side opposite to the dismantling side must cross the space e between the two sections of each rail and, consequently, be equipped with two separated rollers 72, 72'.
• the chocks 3, 3 ′ placed on the dismantling side could comprise a single roller sufficiently spaced from the median plane Q to allow the vertical movement of the chock when the corresponding rail sections are in their rolling position.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Crushing And Grinding (AREA)
• Machine Tool Units (AREA)

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• 2001
  • 2001-05-18 FR FR0106615A patent/FR2824764B1/fr not_active Expired - Fee Related
• 2002
  • 2002-05-17 US US10/477,512 patent/US20040144150A1/en not_active Abandoned
  • 2002-05-17 CN CN02801741A patent/CN1463208A/zh active Pending
  • 2002-05-17 EP EP02740798A patent/EP1395375A1/de not_active Withdrawn
  • 2002-05-17 RU RU2003136282/02A patent/RU2003136282A/ru not_active Application Discontinuation
  • 2002-05-17 WO PCT/FR2002/001691 patent/WO2002094465A1/fr not_active Application Discontinuation
  • 2002-05-17 KR KR10-2003-7000714A patent/KR20030022865A/ko not_active Application Discontinuation

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