FR2523879A1 - METHOD AND DEVICE FOR SUPPORTING CYLINDERS FOR CHANGE - Google Patents

Abstract

A. CYLINDER SUPPORT PROCEDURE AND DEVICE FOR CHANGING CYLINDERS IN ROLLER CAGES. B. PROCESS CHARACTERIZED IN THAT THE AXES 6 OF THE SUPPORT DEVICES 1 PROVIDED FOR ON THE SERVICE SIDE ARE DIRECTED, DURING THE LAMINATION, BY A PERMANENT ELASTIC FORCE TOWARDS THE UPPER MOUNTING PARTS 33 OF THE WORKING CYLINDER, AND COME INTO AGAINST THEM -CI, THEIR ELASTICITY BEING ABOLISHED IN THE UNLOADED OPERATING PHASE OF THE CYLINDER CHANGE. C. THE INVENTION APPLIES, WHEN A CONTINUOUSLY RUNNING ROLLING TRAIN IS STOPPED, TO CHANGING A WORKING CYLINDER WITHIN A MINIMUM OF TIME.

Description

Method and device for supporting cylinders for the

  change of rolls in rolling mill stands ".

  The present invention relates to a method and a

  positive for the exchange of the working rolls of a roll stand, according to which the convex surfaces of the rolls, during the assembly and disassembly operation, are held together and applied to one another by their workpieces at a constant spacing, and in which the upper and lower roll mounting pieces are introduced and extracted from the roll stand by means of moving wheels on rails which are assigned to them and which provide in the stand

  of rolling mill the distance of spacing required.

  When assembling and dismounting rolling cylinders, it is absolutely necessary that the cylinders

  do not rest on one another by their bulging part.

  For this reason, it is known (patent DE 2 022 385) to equip the lower cylinder mounting parts

  with fixed trunnions and to rest on those

  Cylinder mounting parts It is then necessary to lift the upper cylinder with its mounting parts so that the pins of the lower mounting parts can be pulled out.

  completely holes in the upper mounting pieces

  in which they find themselves in the operational phase.

  Then, the lower cylinder, with its mounting parts is moved a certain amount in the direction of the cylinder axis By this axial displacement, the journals come out of the range of the holes and are placed above a surface neighboring plane It is then possible to lower the cylinder

  the trunnions, so that the cy-

  linders can be taken out leaving the space between them

  With this exchange device, it is in any case impossible to change the rolls when the rolled strip is still in the rolling mill, which means that for

  continuous rolling operation, it is neces-

  in the event of a market incident, either to withdraw the

  rolled strip, or to roll it up to its exit.

  In order to be able to exchange the rolls, even if the product to be rolled is still in the rolling mill or

  in the continuous rolling train, it is known to use

  (DE 24 33 569) a provision of two

  One of these pairs of rails is for the upper cylinder, and the other is for the lower cylinder.

  the cylinders are equipped with rollers

  so that these parts can be taken out

  outside after being laid on the rails.

  Since the rails are arranged only in

  the mill in which they also serve to

  the necessary location between the cylinders, the mounting pieces, for the maintenance of spacing, are

  outside the rolling mill, on the service side

  vice, with the fixed barbs mentioned above by

  against, the lower mounting parts on the drive side

  are carried out in such a way that they

  spaced abutment spacing levers which are in the working position below the upper surface of the mounting piece and which

  the exit of the cylinders, after crossing the window

  on the service side of the fixed frame of the rolling mill, are

  It is understandable that, when introducing a new set of cylinders, the same abutments again bring the spacing lever back into position in order to maintain the spacing.

the neutral position.

  A cylinder exchange, in the case of continuous tandem trains, is actually achievable, but,

  as before, it is absolutely necessary to

  the fixed trunnions of the mounting parts on the

  vice, by a preliminary axial displacement of the cylinder

  lower, out of the piercing area in front.

  On the other hand, the holes result in a weakening

mounting parts.

  The present invention aims to achieve a

  device for supporting and maintaining the spacing of cy-

  lindres, on the input side of a rolling mill, which avoids the known disadvantages during an exchange of the rolls, and in particular avoiding the need for an additional axial displacement operation of the roll of the lower mill. For this purpose, the invention relates to a method characterized in that axes of the support devices provided on the service side are directed, during rolling, by a permanent elastic force to the upper work roll mounting parts, and are coming

  apply against them, their elasticity being sup-

  awarded in the operating phase discharged from the cylinder exchange, the axes being in their position

maximum height.

  The invention extends to a device for the application

  the above method, characterized in that, on the service side of the rolling mill on appendages on each side of the lower roll mounting piece, flange-mounted support devices consisting of

  in a substantially rectangular housing with a positive

  cylindrical lower sleeve, a rotatably mounted sleeve, which is supported in this housing and having, below the rectangular flange part, in the crankcase portion

  of cylindrical shape, a toothed segment, an axis being

  placed in the bushing, pushed upwards under the permanent force of a compression spring, axle provided, in

  the area of its lower portion of two dia-

  contrastingly affected by throats

  of the bushing, the toothed segments

  with racks mounted in the window of the

  rolling stand, to position each sleeve relative to

to the axis.

  According to another characteristic of the invention,

  each axis protrudes inside a bore bor -

  assigned to him, in blocks facing each other

  screwed onto appendages of the mounting piece of the cy-

upper lindre.

  For simpler manufacture, the invention provides that the lower portion of the axis is provided with a thread, and a nut screwed on it has the two bosses. In addition, it is proposed that the housing is closed by lids having through holes

  for the axes, the lower cover with the segment

  toothed and being fixed by means of screws on the socket.

  According to the invention, the compressor spring

  sion is supported on one side against a protruding shoulder of the sleeve, and, on the other side against a collar of the axis This collar, in the expanded position pushed up the compression spring placed under pre-tension, apply against the top cover of the housing.

  In accordance with the invention, the arrangement of the

  toothed relation to the rack makes it easier to move

  relative rotation of the bushing relative to the 90 degree axis.

  rack is mounted stationary in the swing block

  balancing cylinder. A view of maintaining a precise position of the

  rotating sleeve relative to the axis,

  It is intended, in accordance with the invention, for an immobilization ball, loaded by a spring, engaged in a notch of the

  socket when the bosses of the threaded nut are

  wind above the throat of the socket, which is always

  the case when the axis does not provide any support function.

  The following description refers to an example

  embodiment, with reference to the accompanying drawings in which: Figure 1 is a sectional view through the

  support device according to the invention.

  Figure 2 is a sectional view through I-I of the

figure 1.

  Figure 3 is a sectional view through II-II of the

figure 1.

  Figure 4 is an elevational view of the cylinder of a four-roll mill mounted in the window of the frame, in which case the right half, designated "B" represents the inner portion of the drive side, and the left portion , denoted by "A" represents the

service side or entrance.

  FIG. 5 is a plan view and partially in section of the service side, in which case the left half of the figure, designated "U" represents the cylinder

  lower part and the right part, designated by "O"

feel the upper cylinder.

  The support device, designated as a whole by the reference 1, in FIG. 1 consists of the casing 2 which is made substantially above the line

  dashed L, like a rectangular housing with a

  The housing portion 2 located below this line is, on the other hand, of cylindrical shape (FIG. 3). In this case 2 is supported in rotation a bushing 4 which extends with a flange 2b beyond the wall of the housing, and which receives an axis 6 placed under the force of a compression spring 5. The housing 2 is closed with an upper cover

  7 and a lower cover 8 which are provided with

  lanes 9 and 12 for axis 6 The lower cover

  8, which is provided with a toothed segment 13, is connected to the bushing 4 by means of screws 14, so that the bushing, which is extended accurately downwards, rotates when the toothed segment 13 meshes with a suitable rack 15 Against the upper cover 7 is supported a flange 16 of the axis 6, when the compression spring 5, which is engaged in a groove of the sleeve, and which bears against the shoulder 17 , moved the axis 6, through the flange 6, to its maximum height position In addition, in the lower zone of the sleeve 4 are dug two

  18 (figure 2) to which two bosses are assigned

  diametrically opposed ges 19 which are made for example on a threaded nut 22 This nut 22 can be

  screwed on a thread cut in the inferior extension

  6 a of axis 6 and, in its final position of

  wise, it comes to apply, with the projecting bosses 19, against the median portion 6b of the axis 6 In this position, the nut 22 is engaged, with the bosses

  19, in a peripheral radial groove 23 which is frail

  sée in the sleeve 4; so that, after a rotation of the sleeve 4 over the planar zones 24 remaining near the longitudinal grooves 18, the bosses 19 rest on these zones and thus immobilize the axis 6. So that the axis 6 does not is not rotated with the sleeve 4, there is provided a spring connection 20 with the upper cover 7 In order to ensure a precise reciprocal position, when the bosses 19 are in the starting position above the grooves 18, a locking ball 26 slengage, under the pressure of a spring 25 mounted in the housing, in a notch 27

of the rotat sleeve Lve 4.

  According to Figure 4, in the windows of the cage 28 of a rolling mill with four cylinders not shown,

  are supported in the mounting parts 29, a cylinder

  an upper cylinder 32 and a lower cylinder 32a and, in upper and lower mounting parts 33 and 34, respectively, an upper working cylinder 35 and a lower working cylinder 36 In order to disassemble and extract the cylinders 35, 36, are

  provided a pair of transport rails 37 for the parts

  these top 33 cylinder mount and a pair of

  transport rails 38 for the cylinder mounting parts

  The two rails 38 for the lower cylinder 36 are fixed rigidly in the window of the

  28, whereas the two upper rails 37 consist of

  The pivoting of the rails 37a in the desired position is effected by means of cylinders of hydraulic cylinders 47, which are mounted on the central and fixed sides. beams

  48 (Figure 5) In the position brought back

  re, i.e., when the cylinder piston is retracted, the rail ends 37a, which are provided on the service side with an additional inclined plane, pivot about the point 51, and thus release the place for

  displacement of the cylinder-mounting parts, displac-

  resulting from the operation of the rolling mill.

  In view, during an exchange of cylinders, of

  constant spacing between the bends of the cylinders

  Also, even outside the rolling mill, the bottom mounting piece 34 on the service side I, which is shown in the left half of FIG. 4, is equipped with the support devices 1. The drive side which is shown in FIG. right half of Figure 4 is

  provided against ratchets 41, which, during the displacement

  of the set of work rolls on the wheels 40

  encountered stops 42 (Figure 5) and are then

lowered or lowered.

  The service side I of the rolling mill is shown in greater detail in FIG. 5. It can be seen that the support devices 1 are fixed by flanges by means of screws 44 (FIG. 2) on appendices 43 of the assembly part.

  of lower cylinder 34 The toothed segments 13 meshes

  With the aid of racks 15, which are mounted in blocks 39 for balancing the cylinders opposite the axis 6 support devices 1 are screwed blocks 45 on appendices 43 of the upper mounting piece 33 (half right of Figure 5), so that the pins 6 can engage in holes

one-eyed 46 blocks 45.

  The cylinder exchange operation is carried out as follows: After stopping the rolling train continuously, the rolling slot is first discharged, that is to say that the rolling pressure is canceled by actuating the threaded position adjustment spindle, or by moving the cylinder unit and

  piston on the underside of the roll cage.

  so that, also, the axes 6 j under the force of the compression spring 5 reach their position

  maximum height, the first step is to disconnect the

  positive support and balancing cylinder, and, where appropriate, the pressure plate existing between the upper mounting piece 29 and the upper position adjusting pin is removed This is necessary to create the space for disassembly of the Then the cylinder supporting and balancing device is reconnected, so that the cylinder and piston units 52 lift the upper mounting piece 29 and the cylinder and piston units.

  52 a raise the upper mounting piece 33.

  The extremities are then rotated inwards

  displacement rails 37a and, by breaking the equi-

  liberation (the cylinder-piston units becoming inactive) the upper cylinder 35 lowers on the wheels 40 has

  mounting parts 33 on the upper rails 37 Paral-

  In parallel with this maneuver, the lower support cylinder 32 and the lower working cylinder 36 are lowered, and the lower mounting parts 34 are lowered, with their wheels 40, onto the displacement rails 38 mounted on

  fixed station in the rolling mill frame.

  The working cylinders 35, 36 are moved away by means of a displacement cylinder of the exchange device

  of cylinder, not shown The toothed segments 13

  then graze with the racks 15 so that the axis 6 of the support devices 1 is locked in their position in height, because, by the rotation of the sleeve 4, the bosses 19 of the threaded nuts 22 are brought out of the grooves and above flat surfaces 24 The axis 6 can then no longer be pushed down when the weight of the upper working roll is applied to it, each axis 6 being guided in the blind hole 46 of block 45 located opposite During the extraction sequence of the working cylinders 35, 36, the

  drive-side spacing pawls

  When the work rolls, 36 have left the rolling stand, on the transport rails 37, 38, the upper rollers 35 slide downward on the inclined plane against the stops 42 on the service side and are raised by them. rail ends 37 a

  on support devices 1 and 41 of the lower cylinder

  With the set of cylinders displaceable in the manner described, the upper cylinder 35 rests, with an always constant spacing distance, on the lower cylinder 36. The spacing distance constant between the cylinders is assured, when change

  of cylinders, regardless of the diameter of the cylinders.

  After the cylinder game with the old cy-

  lindres is on the cylinder exchange device,

  which can be realized as a platform on wagon-

  net, transversely movable in front of the rolling mill, the platform is removed and the new set of cylinders

  prepared in advance is brought into position in front of

  black This set of cylinders is then moved into the window

  of the roll stand 28 Spacing pawls

  41 drive-side mounting parts that penetrated

  in the frame are automatically folded by the stops 42 and the space between the mounting parts is thus released The lower cylinder 36 with the wheels 40 of the mounting parts 34, then enters the roll cage, rolling on the pair of

  rails 38 mounted stationary The upper mounting parts

  33 run on the pair of rails 37 As soon as the

  toothed segments 13 of the side support devices

  vice 1 mesh in the racks 15, the sockets are rotated 90 degrees with respect to the axes 6, of

  such that the locking of the support devices

  port is cleared and the bosses 19 are positioned

  above the grooves 18 of the sockets 4.

  To continue the rolling, the other necessary preparatory operations are then carried out such as the outward pivoting of the ends of the rails 37a, the connection of roll balancing devices,

  etc., until, finally, 1-right of entry

  In the course of rolling, and as long as they are not unloaded, the shafts 6 of the support devices 1 are pushed down over the bores 46 of the blocks 45, in which case the bosses 19 of the

  threaded nuts 22 of the sleeve 4 are engaged in them.

  gorges 18 and are guided by them.

  It is understandable that the arrangements for

  Port 1 according to the invention can also be put into service for a traditional cylinder exchange, when no rolling stock is no longer presented in the rolling mill In this case, the support devices 1

  are advantageously also provided on the drive side.

ment.

Claims (2)

CLAIMS) A method for exchanging working rolls of a roll stand, according to which the rolled surfaces of the rolls, during the assembly and disassembly operation, are maintained and applied to each other the other by their mounting parts, at a constant spacing, and in which the upper and lower roll mounting pieces are introduced and extracted from the roll stand, by means of moving wheels on rails which are assigned in the rolling mill stand, the method characterized in that axles (6) of the support devices (1) provided on the service side are directed, during rolling, by a permanent elastic force towards the upper mounting parts (33) of working cylinder, and come to bear against them, their elasticity being suppressed in the operating phase discharged from the exchange of cylinder, the axes (6) being in their position of maximum height.   2) support device for the application of the method according to claim 1, characterized in that, on the service side (I) of the rolling mill on appendages   (43) on each side of the cylinder mounting piece   lower bracket (34) are flange-mounted support devices (1), consisting essentially of a housing   rectangular (2) with a cylindrical lower portion   that (2a), a rotating sleeve (4) being supported in this housing (2) and having, below the rectangular flange piece (3), - in the cylindrical housing portion (2a), a toothed segment (13), an axis (6) being arranged in the sleeve (4), pushed towards the   high under the permanent force of a compression spring.   sion (5), with its axis provided, in the area of its   6 (a) of two diametrically opposed bosses (19) to which corresponding grooves (18) of the bushing (4) are assigned, the toothed segments (13) meshing with racks (15) mounted in the window (28) of the rolling stand, to position each bushing (4) relative to the axis' (6).   30) Support device according to the claim   2, characterized in that each axis (6) is engaged in the   interior of a corresponding blind hole (46) of blocks (45) fixed by screws to appendages (43) of the   upper cylinder mounting (33).   40) Support device according to one of the   2 and 3, characterized in that the lower portion   the axis (6a) is provided with a thread on which   is screwed a nut (22) carrying the two bosses (19).   ) Support device according to any one   Claims 2 to 4, characterized in that the housing   (2) is closed with covers (7, 8) provided with   passing holes (9, 12) for the axis (6), the lower cover (8) being provided with the toothed segment (13) and being   fixed to the bushing (4) by means of screws (14).   60) Support device according to any one   Claims 2 to 5, characterized in that the res-   compression fate (5) is supported on one side against a shoulder (17) of the sleeve (4), and on the other side against a flange (16) formed on the axis (6) the flange (16),   in the upwardly relaxed position of the spring (5).   placed under prior tension, coming against   the upper cover (7) of the housing.   ) Support device according to any one   Claims 2 to 6, characterized by a set of   toothed segment (13) and rack (15) which allows a   relative rotation of the sleeve (4) by 90 degrees port to the axis (6).   ) Support device according to any one   Claims 2 to 7, characterized in that the creation   the grid is mounted stationary in the balance block. cylinder braking (39).   9) Support device according to any one   Claims 2 to 8, characterized by a notch   (27) of the sleeve (4), wherein s-engages an immobilizing ball (26) loaded by a spring (25) when   the bosses (19) of the threaded nut (22) are located   above the grooves (18) of the sleeve (4).