DE2303467A1 - ROLLED FRAMEWORK FOR BARS, BLOCKS OR PLATES - Google Patents

Description

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7210 / sta Munich-Pnllach, Jan. 24, 1973

BRITISH STESL CORPORATION, a company by the regulations of the "Iron and Steel Act 1967", 33 Grosvenor Place, London SW 1, England

Roll stand for bars, blocks or sheets i

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The invention relates to a roll stand for bars, blocks or sheets and in particular a quatro or multiple roll stand in Cantilever design.

In British Patent 1 240 658, such a roll stand and in particular a roll stand is described in which each work roll is rotatably mounted together with the associated support roll in a single arm which is pivotably mounted on the stand frame, the two arms about a single fixed pivot axis are pivotably mounted. This design leads to a considerable complexity of the construction in the area of this pivot axis, which results in a possible mechanical weakness under heavy load and difficulties in accessing repair and maintenance work on the parts of the G-scaffold in the area of the pivot axis. This is particularly the case when an eccentric hinge pin arrangement is used as the Applicant is written in the floating loading ^j j German patent application P 21 12 998.6.

In addition, the superposed surfaces of both the work rolls and the backup rolls are in operation wear out, and that the work rolls continue to run on a case-by-case basis

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"Pall need to be reworked. Consequently, the" diameter new rolls considerably larger than the diameter of rolls, which will be used for the last time. The pivotable mounting of the two arms must absorb this diameter rverringerungen on all four rollers, as well as, of course, the comparatively minor movement that occurs with roll gap modulation to ensure that the rolled product has the desired diameter. It is obvious., that the pivoting movement of an arm with respect to the others about any axis changes the angle between the axes of the rollers carried by these two arms. As a result, there is a cutting or grinding effect on the product .between these two rollers when their axes are not lie exactly parallel, the severity of this roughing or grinding depends on the size of the angle.

It is an object of the invention to provide an improved roll stand which incorporates the above and other factors considered.

This task is performed in the case of a roll stand with two work rolls mounted driven in a frame, in which each work roll is supported by a support roll, and at least one the work roll is rotatably supported by an arm which is pivotable about a first axis, around the roll gap between to adjust the work rolls, essentially solved by the fact that the support roll assigned to one work roll ' is rotatably supported by a further arm pivotably movably mounted in the frame about a second axis, which is spaced from the first axis around the gap to be adjusted between the support rollers, and that the pivot axes are substantially perpendicular to the axes of the rollers. .. j

Preferably each work roll is from a separate work roll arm supported, which is pivotable about the first axis, and each support roller by a separate support roller arm

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worn, which corresponding to the second axis and a third axis is pivotable, the second and third axes at intervals on opposite sides of the first Axis are arranged.

The work roll arms are preferably carried in jointly articulated arms which together form a sub-unit, wherein this sub-unit is detachably and removably mounted on the frame. Such arrangements are in the pending state German patent application (short number P / 7211) from the same priority date.

This subunit can be spaced between the two located pivot axes of the support roller arms and extend substantially perpendicular to these.

Preferably, a set-up is provided to ensure the effective To adjust the position of one of the or both of said second and third axes, thereby enabling the axes to be adjusted of the assigned back-up rollers when viewing the workpiece throughput line or to get away from it. Preferably, the device for adjusting the effective position of this axis or axes degree markings, so that the effective location this axis (axes) can be preselected.

The invention is explained in more detail below with reference to an embodiment illustrated by way of example in the drawings .

Fig. 1 is an overall view of a tightly coupled from Twin rolls formed roll stand according to the present invention as a quatro roll stand;

Fig..2 is a partially sectioned side view of a the roll stands illustrated in FIG. 1;

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3 shows a partially sectioned rear view of the framework according to Fig. 2, which illustrates in two positions on either side of the vertical center line is;

FIG. 4 shows a sectional view along the line IV - IV of FIG. 2; and

Fig. 5 is a partially sectioned front view of the in Fig. 2 illustrated framework, which on either side of the vertical center line in two different positions is illustrated.

In the drawings, FIG. 1 shows a tightly coupled twin quatro roll stand in cantilever design for bars or profile steel, viewed in the direction of the workpiece passage line 9. The two roll stands 10, 11 have a common base frame 12 with uprights 13, H and upper and lower cross members 15, 16. The rolling stands are driven, for example by individual motors 17, 18, and are arranged in a non-rotated manner, so that the rolling material does not have to be rotated between the two passes. The stands are the same as each other, and one of them is 45 in FIGS. 2, 3 and 5
position rotated illustrated.

is in Figs. 2, 3 and 5 at 45 to facilitate the presentation

Each roll stand consists of a pair of work rolls 20,21 supported by respective backup rolls 22,23 are. The work rolls are releasably mounted on the free ends of drive shafts 24, 25 for the work rolls, which rotatably supported by respective work roll arms 26,27 and driven by the motors 17,18 via clutches 28,29 are. The two arms 26, 27 are fastened to one another so as to be pivotable about a first axis at the pivot point 30, in order thus to to form a sub-unit which is detachably held in the "frame" by an offset pin 31. What further details of this subunit concern are given on

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the above-mentioned pending German patent application of the same Priority date referenced.

Die Stut zwalzen 22, 2 3 are rotatable in upper and lower Support roll arms 35, 36 supported and supported by them. Each arm consists of a central strut 37 with upper and lower j ren flanges 33 »39 and is attached to a massive and heavy j formed front block 4 ^ attached. Each arm 35, 36 is at j its rear end pivotably movable about the mentioned second or third axis on pivot pin 41 by means of an eccentric "Trunnion assembly attached, which is described below with reference to" Fig. 4 will be explained in more detail.

Each block 4 <~ 'has an axle stub 42 attached to it on, and the support roller is thereby held by means of a self-aligning spherical ball bearing, which schematioch at 43 * it is illustrated that the support rollers are on their associated work rolls are aligned. This storage is against the undesired rotation about a horizontal Axis by means of a flat-sided guide 43 a stabilized, which protrudes from the axis 42 to the front and which to a limited extent in the vertical direction in an in a circular plate 44 formed vertical slot 43 b is slidable. One attached to the back-up roll The collar 45 rotates concentrically around the stationary plate 44 by means of a simple ball track bearing 46.

Avis den ^v ± g, 2, 3 and 4 it can be seen that each support roller pivot 41 can be withdrawn from the frame by means of a handle 47 which is normally locked for easy installation and removal of each entire support roller and support roller arm assembly to the front to allow the opening between the uprights of the frame. The Angelzapfpn 41 works in bores 43 in solid cross members 49 of the frame, which are attached to the base frame 12.

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An eccentric 50 is arranged on the pivot 41, which has a cylindrical outer surface centered on the axis 52 and offset with respect to the axis 53 of the pivot pin 41 is. The surface 51 operates in a bore in the rear end of the backup roller arm. It is thus obvious that a movement of the eccentric 50 in an arc with respect to the pin 41 moves the effective pivot axis 52 of the associated support roller arm out of its position. The eccentric is like that formed that the two axes 52, 53 in the view of "Pig. 2 in the central position of its movement side by side lie so that a movement of the eccentric from its central position causes the effective pivot axis 52 substantially is moved vertically up and down, at least at the beginning of its movement in the view of Fig. 2. '

The adjustment of the position of the eccentric is effected by loosening lock nuts 55, 56 and by moving the rod 57 essentially axially through an opening in a bracket 50 which is attached to the strut 37. The rod 57 is pivotable attached at 59 to the arms 60 of the eccentric 50. Graduations 61, which are provided on the eccentric opposite a marking on the strut 37, facilitate the adjustment of the eccentric in a desired position. The lock nuts are then tightened again.

In particular from Fig. 5 it can be seen that the front ends of the backup roll blocks 40 are arranged in a tight sliding fit between the uprights 13, 14 of the roll stand frame. The upper block has downwardly directed side parts 70 and the lower block has upper side parts 71. Part 71 contains piston and cylinder means 72 which can be pressurized to move the two blocks from their closest position, illustrated on the left hand side of FIG right hand side from? ig. 5 is illustrated to be separated from each other. The piston-cylinder devices are also pressurized when the roll stand is in

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Operation, is to prestress the scaffolding, as described below will be explained in more detail.

From Pig. 5 it can be seen that the front end of the work roll arms has lagerblöeke 80, the sliding fit between the side parts 70, 71 of the associated support roller blocks are arranged. The lower block 80 contains piston-cylinder devices 81, which can be acted upon by bridge, to the two blocks 80 from their closest position, which is on the left side of Fig. 5 is illustrated in its am furthest apart position - the one on the right side of Pig. 5 is illustrated from each other separate. These devices are further pressurized when the roll stand is in operation in order to pretension it or preload. A piston and cylinder device 96. » which is arranged in the untar block 50, serves, when extended, to lift the lower work roll 21 from the backup roll 23.

From FIGS. 2, 3 and 5 it can be seen that the lower support roller arm 36 is attached to the base frame 12 by means of its block 40 is mounted, which rests on an adjustable wedge device 82, the position of the associated wedge 83 is controllable by handles 84.

The rolling force between the work rolls is generated by a heavy hydraulic piston cylinder device 85, whose line of action coincides with that of the wedge device and with the center line between the frame posts. The establishment acts on the block 40 of the upper support roller of the arm 35 and is designed to compensate for the slight angular errors, which occur during operation due to the fact that the rollers are supported by arms that can be moved around pivoting axes, where the pivot axes are a certain distance from the Have workpiece passage line. A preferred form of device 85 is disclosed in British Patent Application No. 20649/72 by the applicant.

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The operation of the rolling frame is explained in more detail below. It is believed that the mill stand is in the process of resuming operation with new backup rolls and new work rolls were assembled, and that furthermore the maximum gap of the work rolls (for example 4 mm) should be used. At the It starts with the tensioning device 85 and the work roll separating devices 81 relieved, the devices 72, however, pressurized to separate the support roller arms from one another To keep away, the cooler 82 is adjusted to raise the head line of the lower work roll 21 or lower and in the correct relationship to the workpiece passage line (for example 2 mm below this line in the selected example). It is evident that the work roll 21 rests on the support roller 23 and is carried with this up or down. If necessary, will the lower support roller arm 36 associated Sx.zenter 5 ^ set so that the axis of the lower support roller in the direction the associated work roll axis or is adjusted away from this, about the axis of the backup roll as accurately as possible parallel to the axis of the work roll.

The separators 81 are actuated to close the upper work roll arm raise or lower with respect to the lower arm so that the work roll gap is just right has vertical height. After that, the eccentric fishing pin can nan order 95 actuated, if necessary, to the adjust axial roll groove alignment as described in more detail in the above-mentioned copending application. The devices 72 are relieved of load so that the upper backup roller arm 35 moves downwards around the upper backup roller 22 in support of their associated work roll 2Γ * zn "bring,

X-etatlicli the load device 85 is pressurized and at the same time the devices 72 and 81 are pressurized. so that any play between the four arms themselves and between the arms and the frame, as well as the suspension of the

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j frame itself is recorded. All surfaces in the The load path is thus preloaded. During rolling is through; the control of the pressure with which the device 85 beaufj is hit, the roll gap between the work rolls is

j controls. This condition of the four reels is on the right j ^c ieite of Pig. 5 illustrates. The device 85 works ι at an extreme angle of approximately 23 minutes in this state.

! After prolonged rolling, the work rolls wear out and have to be reworked at regular intervals. In a similar way

The back-up rolls wear out. In order to rework the work rolls, the load device 85 is relieved and the separating devices 72, 81 and 96 are actuated to keep an open gap between the work rolls and to open a gap between the work rolls and the back-up rolls. The work rolls can then be released from the ends of their drive shafts and new or reworked rolls installed in their place. A similar procedure is followed to remove and replace the support rollers. When the roll stand operates with work rolls and 3 back-up rolls of the smallest possible diameter, the devices 72 and 81 are in their most retracted positions, as illustrated on the left-hand side of Fig. 5, and the eccentrics 5 ^r 'are also close to adjusted to the other end of their movement. At the same time, the device 35 is acting at an extreme angle of up to about 37 minutes. It can happen that the eccentrics 5 <~ also have to be adjusted when changing or changing backup rolls, but are normally not adjusted when changing work rolls.

^Case-by-1 ^ aIl, it may happen that the entire sub-unit of the two working roller arms should be put. The device 35 is then relieved, the wedge device 82 is set to its lowest possible position, and the devices 72 are operated to the greatest possible extent. The piston and. ■ ".-

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Cylinder device 96 is pressurized to the lower Just lift the work roll clear of the lower backup roll to avoid rubbing. The drive shafts are is disengaged, and the subunit can then intervene forwards taken out the frame sets by means of a support beam will. .

It has already been mentioned that the load device 85 must work for rolls with a maximum diameter and a largest possible roll gap at one extreme angle and at the other extreme angle for rolls with the smallest possible diameter and minimum roll gap. The angular difference between these extremes is acceptably small in magnitude and the device can be designed to accommodate this fact in a number of ways, even in view of the extremely large workloads encountered in a rolling mill. The angular difference between these two extreme positions can be reduced by placing the second and third pivot axes 52 further away from one another in order to bring them closer to the plane of the devices 35 or the wedge device 82. However, as these axes are moved away from each other, the problem of roughing or grinding between the backup roll and the work roll becomes more severe. The latter problem is the more serious problem and thus the best compromise position for the pivot axes is chosen for each particular roll stand structure under consideration. If one also takes into account the advantages that result from the fact that the work roll arms are provided as a removable sub-unit, as described in the above-mentioned patent application of the same priority date, the position of the pivot axes selected in the illustrated embodiment is as close to one another as this is practically possible, while at the same time enough space has remained free between them to accommodate the removable sub-unit. It should be noted that the grinding or roughing problem can be overcome by accurately and properly adjusting the cutter 50 for each rolling situation in the manner described

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can be minimized, if not completely avoided, although this adjustment will not always be necessary in practice. Another advantage of this design is that a single pivot pin can be used for each back-up roll arm instead of having to use the complicated structure with a pivot point on each side of the mill stand for each arm. This solves the problem of precise alignment and contact between block A? and the walls 13 and 14 in the frame opening. In addition, the accessibility of the "moving parts" is greatly improved. The removability of the sub-unit has already been explained above, and furthermore each support roller arm with its support roller and the eccentric arrangement can be removed as a whole. By using the graduations 61 near the eccentrics a back-up roll can be replaced and the eccentric adjusted before the back-up roll subunit is reinstalled in the roll stand.

The pivot axes 51 and likewise the pivot axis of the work roll arm are at a distance from the workpiece passage line arranged, u. Zw. As far as this is practicable, the illustrated relative positions are sufficient to the described changes in angle of the positions of the four arms during the different operating states of the roll stand to one practical minimum.

All of those mentioned in the description and in the drawings recognizable technical details are important for the invention.

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Claims (4)

Claims ί 1. Roll stand with two driven and mounted in a stand frame Work rolls, each work roll being supported by a backup roll, and at least one of the work rolls rotatable by an arm. is worn, which around a first axis for adjusting the working gap between the working rolls is pivotable, characterized in that J that this work roll (20) associated support roll (22) j is rotatably supported by a support roll arm (35) which I is mounted in the "frame (12) so as to be pivotable about a second axis (53) j which is at a distance from the first axis (30) is arranged to adjust the gap between the support rollers (· 22, 23), and that the pivot axes (30, 53) in the are substantially perpendicular to the axes of the rollers (20, 22). 2. Roll stand according to claim 1, characterized in that. an adjusting device (50, 55, 56, 57, 58) is provided is to adjust the effective position of the second axis (53) to thereby adjust the axis of the associated Back-up roller (22) in the direction of the workpiece passage line and to ensure away from this. 3. Roll stand according to claim 1, characterized in that each work roll (20, 21) of a separate work roll arm (26, 27) is carried, which is pivotable about the first axis (30), and that each support roller (22, 23) is carried by a separate back-up roller arm (35, 36) around the second axis (53) or a third Axis (41) is pivotable, 'wherein the second and third axes (53, 41) at a distance on opposite sides the first axis (30) are arranged. 4. Roll stand according to claim 3, characterized in that Setting devices (50, 55, 56, 57, 58) for setting the effective position of the second and third axes (53, 41) 3 09-83 1 / OB 16 are provided to adjust the axes of the backup rolls (22, 23) in the direction of the workpiece passage line and to enable away from this. Roll stand according to Claim 2 or 4, characterized in that the "setting device (5 ^, 55, 56, 57, 58) has markings the graduation, so that the location of the Axis (53) or axes (53 »4-1) can be preselected. Roll stand according to one or more of Claims 1 "to 5, characterized in that the work rolls (20, 21) in individual arms (26, 27) are supported, which are articulated to one another to a sub-unit of the roll stand form, and that this sub-unit is removably mounted on the "frame (12). 309831/0516 Blank page