Device for disassembling rolling mill cylinders

Abstract

The invention regards a device for disassembly of the rolls of a rolling mill by translation, successively, on internal ( 5 ) and external ( 55 ) rails whereon run the supporting rollers ( 7 ) of the chocks ( 3 ). According to the invention, each internal rail ( 5 ) is composed of two sections ( 51, 52 ) mounted to slide, respectively, on both standards ( 10, 100 ) of the stand ( 1 ), between a retracted rolling position and a forward disassembly position for which both sections ( 51, 52 ) are brought towards one another, their internal ends ( 53′, 54 ′) being separate by a free space (e), and each chock ( 3 ) is fitted with rollers ( 72, 72 ′) spaced from one another by a distance (d) greater than said free space (e) in order to rest successively on said sections ( 51, 52 ) during the disassembly and the reassembly processes.

1 . A device for disassembling rolls for a rolling mill comprising a holding stand ( 1 ) having two spaced standards ( 10 , 100 ) and at least two working rolls, respectively lower ( 2 ) and upper ( 2 ′), delineating a gap to let through a flat product (M) along a rolling plane (P 1 ), whereas each roll ( 2 ,  2 ′) is mounted to rotate around its axis on two holding chocks ( 3 ,  30 ,  3 ′,  30 ′) centred each on a middle plane (Q) orthogonal to the axis of the roll and attached respectively in two windows ( 11 ) provided each between two stanchions ( 12 ) of each standard ( 10 ,  100 ), each window ( 11 ) being fitted with guiding faces ( 45 ) sliding from said chocks parallel to a clamping plane (P 2 ) running substantially through the axes of the rolls, said rolling mill being fitted with a device for disassembling rolls by translation, successively, on at least one pair of internal rails ( 5 ) parallel to the axes of the rolls and extending respectively, on either side of the clamping plane (P 2 ), between the corresponding stanchions of both standards ( 10 ,  100 ) of the stand ( 1 ), and at least one pair of external rails ( 55 ) extending from the outside of the stand ( 1 ), at least on a disassembly side, each in the alignment of an internal rail ( 5 ), both chocks of at least one roll ( 2 ) being fitted with bearing members ( 7 ) mobile on said internal ( 5 ) and external ( 55 ) rails, 
 characterised in that, on either side of the clamping plane (P 2 ), each internal rail ( 5 ) is composed of two sections ( 51 ,  52 ) extending each, on a delineated length, between two ends, respectively internal ( 53 ′,  54 ′) and external ( 53 ,  54 ), and mounted to slide, respectively, on both standards ( 10 ,  100 ) of the stand ( 1 ), parallel to the axis of the roll, in that the rolling mill comprises means ( 82 ) for controlling the sliding motion of both sections ( 51 ,  52 ) of each internal rail ( 5 ) from a rolling position for which each section ( 51 ,  52 ) is retracted from the gap ( 17 ) between both standards ( 10 ,  100 ) to a position for disassembling the roll ( 2 ) for which both sections ( 51 ,  52 ) are brought towards one another, in the gap ( 17 ) between both standards ( 10 ,  100 ), the internal ends ( 53 ′,  54 ′) of said sections ( 51 ,  52 ) being separate by a free space (e), in that each mobile bearing member ( 71 ) of a chock ( 3 ) is spaced away from the middle plane (Q) thereof, by a distance greater than the distance between said middle plane (Q) and the corresponding end of said rail section, when said rail is situated in the rolling position, and in that at least the chock ( 30 ) holding the end of the roll ( 2 ) opposite to the disassembly side is fitted on either side of the clamping plane (P 2 ), with two mobile bearing members ( 72 ,  72 ′) spaced from one another by a distance (d) greater than the length (e) of the existing free space, in the position for disassembly of the roll, between the internal opposite ends ( 53 ′,  54 ′) of both two sections ( 51 ,  52 ) of internal rail ( 5 ).  
 
     
     
         2 . A device according to  claim 1 , characterised in that both chocks ( 3 ,  30 ) of each roll ( 2 ) are fitted each, on either side of the clamping plane (P 2 ), with a pair of mobile bearing members ( 71 ,  71 ′), ( 72 ,  72 ′) spaced from one another, in the axial direction by a distance (d) greater than the length (l) of the corresponding rail section ( 51 ,  52 ).  
     
     
         3 . A device according to either of claims  1  and  2 , characterised in that both rail sections ( 51 ), (52) mounted on the same standard ( 10 ), ( 100 ) of the stand, on either side of the clamping plane (P 2 ), are interconnected with one another by linking means ( 8 ) and associated with means ( 82 ) for controlling the simultaneous sliding motion of both sections ( 51 ), ( 52 ), from the rolling position to the disassembly position, and conversely.  
     
     
         4 . A device according to one of the previous claims, for simultaneous disassembly of both working rolls ( 2 ,  2 ′), bearing over one another, characterised in that it comprises two pairs of rail sections ( 51 ,  52 ) mounted respectively on both standards ( 10 ,  100 ) of the stand, at the same level for disassembling a first roll ( 2 ) whereon rests the second roll ( 2 ′).  
     
     
         5 . A device according to one of the  claims 1  to  3 , characterised in that it comprises four pairs of rail sections ( 51 ,  52 ), ( 51 ′,  52 ′) mounted respectively, at two disassembly levels, on both standards ( 10 ,  100 ) of the stand ( 1 ) for which both rolls ( 2 ,  2 ′) are spaced on either side of the product (M) during a rolling process, in order to form, at each level, a pair of internal rails ( 5 ,  5 ′) extending respectively on either side of the clamping plane (P 1 ).  
     
     
         6 . A device according to one of the previous claims, characterised in that the mobile bearing members of the chocks ( 3 ,  30 ) are running rollers ( 71 ,  72 ) on the rail sections ( 51 ), ( 52 ).  
     
     
         7 . A device according to one of the  claims 1  to  5 , characterised in that the mobile bearing members of the chocks are sliding parts on the rail sections.  
     
     
         8 . A device according to one of the previous claims, characterised in that the rolling mill is fitted with C-shaped hydraulic blocks comprising, on either side of the rolling plane (P 1 ), two protruding portions ( 41 ,  41 ′) at the ends whereof are provided faces ( 45 ) for lateral guiding of the working chocks ( 3 ) which are fitted each with two bearing ears ( 31 ) for height adjustment of the chock, and in that said bearing ears ( 31 ) are offset towards the rolling plane (P 1 ) and engage into a central scalloping ( 42 ) of each hydraulic block ( 4 ) provided between the protruding portions ( 41 ,  41 ′) thereof.  
     
     
         9 . A device according to  claim 8 , characterised in that the rail sections ( 51 ,  52 ) mounted on each standard ( 10 ,  100 ), on either side of the clamping plane P 2 ), for supporting each roll ( 2 ,  2 ′) are arranged along ends of the protruding portions ( 41 ,  41 ′) of the hydraulic blocks ( 4 ) and are housed in scallopings ( 33 ) provided on a portion of the height on either lateral side ( 34 ) of a chock ( 4 ), while keeping on said lateral side ( 34 ) and on the end of the protruding side ( 41 ,  41 ′) guiding faces ( 35 ,  45 ) sliding over one another and having a height (h 2 ) compatible with the level adjustment possibilities of the chock ( 3 ).  
     
     
         10 . A device according to  claim 9 , characterised in that each rail section ( 51 ,  52 ) is mounted to slide axially from the end of the protruding side ( 41 ,  41 ′) of the hydraulic block ( 4 ) to the bottom ( 36 ) of the scalloping ( 33 ) provided on the lateral side ( 34 ) of the chock ( 3 ), said bottom ( 36 ) and the corresponding face ( 46 ) of the rail ( 51 ,  52 ) being fitted with wearing plates sliding over one another, on the one hand in the axial direction during the displacements of the rail section ( 51 ,  52 ) and, on the other hand, in the vertical direction during level adjustments of the chock, in order to form additional means for lateral holding of the chock ( 3 ).  
     
     
         11 . A device according to one of the previous claims, characterised in that each mobile bearing member ( 71 ,  72 ) of a chock ( 3 ,  30 ) is mounted at the end of an arm ( 73 ) fixed on the chock and extending axially over a length such that said bearing member ( 71 ,  72 ) is spaced away from the middle plane Q of the chock ( 3 ) by a distance greater than the distance between said middle plane (Q) and the corresponding end ( 53 ,  54 ) of the rail section ( 51 ,  52 ).  
     
     
         12 . A device according to either of claims  10  and  11 , characterised in that each rail section is mounted to slide axially on a slideway ( 6 ) provided on the end of the protruding side ( 41 ,  41 ′) of the hydraulic block and in that, in the forward disassembly position, the slideway ( 6 ) associated with each rail section ( 51 ,  52 ) remains engaged in said protruding portion ( 41 ,  41 ′) over an embedding length sufficient for holding in a cantilever position the rail section ( 51 ,  52 ) under the load of the roll ( 2 ).  
     
     
         13 . A device according to  claim 12 , comprising, on each standard ( 10 ,  100 ) of the stand ( 1 ), two pairs of rail sections ( 51 ,  51 ′), ( 52 ,  52 ′) placed at two disassembly levels, respectively, of both working rolls ( 2 ,  2 ′), characterised in that both rail sections ( 51 ,  51 ′) ( 52 ,  52 ′) placed on each standard ( 10 ,  100 ) and on each side of the clamping plane (P 2 ) are interconnected by a linking member ( 8 ) whereon rests a first element of a jack ( 82 ) controlling the axial displacement whereof the second element rests on the standard ( 10 ,  100 ) and in that both jacks ( 82 ) placed respectively on either side of the clamping plane (P 2 ) are actuated in a synchronous fashion for the control of simultaneous axial displacement of the rail sections of both pairs ( 51 ,  51 ′) ( 52 ,  52 ′).  
     
     
         14 . A roll replacement process in a rolling mill fitted with a device according to one of the previous claims, associated with a replacement carriage placed on a side for disassembly of the stand, wherein each rail ( 5 ) for disassembly of a roll is composed of two sections ( 51 ,  52 ) mounted to slide parallel to the axis of the roll ( 2 ,  2 ′) each on a standard ( 10 ,  100 ) of the stand, characterised in that, after having placed each roll ( 2 ,  2 ′) at its disassembly level, internal rail sections ( 51 ) mounted on the front standard ( 10 ) placed on the disassembly side are caused to slide towards the inside of the stand, the replacement carriage which is fitted with external rails ( 55 ) situated in the alignment of the sections ( 51 ) thus brought forward, are fed towards this standard ( 10 ), then the translation of the roll to be replaced ( 2 ,  2 ′) is initiated, which rests on both pairs of rail sections ( 51 ,  52 ), then the sections ( 52 ) placed on the rear standard ( 100 ) are fed forward and the roll is fed forward further, whereof the rear chock ( 30 ) rests successively on the rear ( 52 ) and then on the front ( 51 ) sections by its two spaced bearing members, while crossing the free space between said sections, until the worn roll rests on the replacement carriage and, by reverse operations, one inserts into the stand a new roll, then the rail sections ( 51 ,  52 ) are caused to slide towards the outside of the stand in order to put them back into rolling position, each being taken up in a standard ( 10 ,  100 ).