DE1809260A1 - Rolling mill - Google Patents

Description

DR. MÜLLER-BORE DIPL.-ΙΝβ. GRALFS 1 8 0 9 2 6 Π

DIPL.-PHYS. DR. MANITZ DIPL.-CHEM. DR. DEUFEL

PATENT LAWYERS

Munich, November 14, 1968 Bol / S -.B 627

THE BRITISH IRON AND STEEL RESEARCH

ASSOCIATION 24- Buckingham Gate, London S.W.1., England

Rolling mill

The invention relates to rolling mills and relates particularly, but not exclusively, to a rod or rod Bar or wire rod mill.

When rolling bars or rods in a steel mill, for example, the width of the bar or the rod depends Rod leaving the last roll stand, to some extent, from the height of the rod or of the rod that leaves the penultimate roll stand. In case the height and width of the last one Mill leaving material are both kept within narrow limits of a desired value it is therefore desirable to increase the nip height of the last and penultimate roll stands steer.

To achieve this, it is necessary to have the appropriate Measure dimensions of the material being rolled and then use a servo device or a similar system

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Adjust the roller gaps to ^ any deviation from the to correct the desired height and width.

If such an adjustment is to be effective, especially at the high rolling speeds that are encountered with materials With a small cross-section applied, it is important that the inertia of the rollers in their attachments on the rolling mill is low, so the frequency response or responsiveness of the nip setting servo system is appropriate to eliminate or at least eliminate defects in the rod or rod material produced to reduce.

It is therefore an object of the invention to provide an arrangement for a rolling mill stand ", in particular, .but nidLu only for the last and before ™ Last Valzen caliber or the last and penultimate Roll stand, in which the work rolls of the stand are adjustably attached to the rolling mill frame, see above that the roller gap can be adjusted, and in which the need to be overcome when adjusting the roller gap Inertia is low taking into account the masses of the associated machine elements Provide sufficient structural strength and rigidity to withstand the rolling loads.

A rolling mill stand with a stand and two work rolls, which are rotatably mounted on the stand as a drive is characterized according to the invention in that at least one of the work rolls is rotatable is mounted in an arm which is pivotably articulated on the stand in order to adjust the nip to allow between the rollers.

8AD ORIGINAL

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The work rolls are preferably supported by backup rolls or counter rolls, one of which is support or Counter roll is rotatably mounted with its associated work roll in the arm.

The invention is explained below, for example, with reference to the drawing; in this show:

Figure 1 is a general view of a close-coupled, double-stand, four-roll bar or bar mill according to the invention, viewed along the material passage line (puncture line),

Figure 2 is a plan view of the rolling mill,

FIG. 3 is a partial sectional view along line A-A of FIG. 2,

Figure 4- is a partial sectional view along line B-B of Fig. 2,

FIG. 5 is a view along line D-D of FIG. 3 $

Figure 6 is a view along line E-E of Figures 3 and

FIG. 7 is a vertical partial sectional view of a modified embodiment of the support roller attachment.

As can be seen from FIGS. 1 and 2, the illustrated embodiment has two closely coupled roll stands 10 and 11, which are each driven in the usual manner by a corresponding electric motor via a reduction gear 12 or 13.

The two roll stands or roll stands K υ- j 1 this embodiment are each as the last and penultimate roller set or roller gear when rolling one Rod or rod material 14 arranged ». The two

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Stands 10 and 11 are arranged on a common frame 15 in such a manner as to serve as a working method "without twisting or twisting" is known as it is not necessary to have the material to be rolled between to rotate the two calibers around its axis. This is of course achieved by the arrangement of the two stands at an angle of 90 ° to each other, so that their lines of attack or action also are at 90 ° to each other.

The two roll stands 10 and 11 each have a pair of work rolls 20 and 21, which through the Support rollers 22 and 23 are supported. The work roll 20 and its associated backup roll 22 on each the stator 10 and 11 are each rotatably supported in an arm 24, and the work roll 21 and their associated support roller 23 of each stand 10 and are each rotatably mounted in an arm 25. A preferred method of mounting work rolls 20 and 21 for rotation on their respective shafts in FIG the arms 24 and 25 is described in the applicant's co-pending patent application which under the title "Walzwerk-Walzenanendung" under the same Date was submitted.

To the nip between the work rolls 20 and To be able to adjust, arms 24 and 25 are respectively pivotally mounted as a cantilever around an axis 26 in the frame 15, which for both uprights 10 and is common. An opening 28 with a rectangular or square cross-section is in the framework 15 in the Part of the framework is provided which forms each of the uprights 10 and 1.1. The arms 24 and 25 of each stand are in the side with a tight sliding fit

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corresponding openings 28 are arranged so that they are arranged closely axially with respect to the pivot axis 26, but freely within the opening 28 around the Axis 26 can pivot. The tight glide? or the close sliding fit is best from the Pig. 5 and 6 can be seen.

The upper arm 24 has a generally nacü below directed fork-like component 40 is provided, and the lower arm is provided with a generally upwardly directed fork-like member 41, which the component 40 surrounds the side in a narrow spread-like manner. Each of the two arms of each component 40 and 41 is with matching lateral bores 42 and 45 Mistake. The bores 42 and 43 match me bores 44, which through opposite side walls 45 and 46 of the mill stand go through it. Solid pivot pins 47 extend through the Bores 44, 43 and 42 from each side wall 45 and 45. The pins 47 are laterally through the heads 48 in their position, which are received in recesses 49 in the side walls 45 and 46. the Arms 24 and 25 are therefore both pivotably mounted on bolts or pins 47.

The arm 24 is also supported on the stand 15 by means of a force measuring element (load cell) 50, the The line of attack or action runs closer to the rolling mill rolls 20 and 21 than the pivot axis 26.

In order to generate the actual rolling force between the work rolls 20 and 21, the arm 24, which is the upper one in each of the uprights 10 and 11, is pushed down by a hydraulic cylinder piston device 51 ·> or other device such as a

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BAD ORfGiNAL

- D -

siner screw spixidel, their line of attack or action closely corresponds to that of the sensing element 50 * The force measuring element 50 and the hydraulic cylinder are set up 51 are provided with spherical bearing surfaces on their respective arms 25 and 24 to accommodate the slight angular misalignments which occur in the operation or the effect between them

A hydraulic jack cylinder separator 52 is provided, which in an effective manner between the Arms 24- and 2.5 (or preferably between the work s - = roller shaft bearing blocks 53) wtr-lrfc ■ ι fl is so pcgcordered, that they the Lrr.e 24 \ md 25 ^ .-- iinf-rd.,: · away g-äger. the Effect of Hjdiai.lik.-yiindPr-rolbrnai .- 'X'iehuns 51 swivel ·.

ü:! ^ arrangement is therefore met in such a way that the lower 4r.m; "5 VvL. Ism Ibaftmesselement 50 is supported and:" Vrir c'oai,. --.'- ?. tt 2 'from the lower Ariu 25 pushed away F dnrc> the Hylrat.liktrenneinriefctung 52 jeöoch to un * will be printed ir calibration Tung on the arm 25 through the:. r ^ .astringsh draalike The hydraulic separation system 52 is supplied with a pressurized fluid, the result of which can be selected so that there is every play between the various elements and parts, ie the two arms 24 and 25 and the force measuring element 50 , the hydraulic loading device 51 and the hydraulic separating device 52, together with any flexibility or suspension, is received in the framework 15. All surfaces with a load path are consequently pretensioned. The hydraulic loading device 51 is supplied with a pressurized hydraulic fluid, the pressure of which is selected such that the upper arm 24 is pressed downward against the action of the triinvoi direction 52 and against the action of the separating loads

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which the rollers 20 and 21 through the material is given when the actual rolling takes place in order to maintain the desired nip.

It can thus be seen that an arrangement is provided by which the gap between the rollers 20 and 21 can be controlled by the action of the hydraulic loading device 51j and by which the rolling load actually applied can be measured by the force measuring element 50 the material 14 either through the stand 10 or the stand 11 dimension generated is measured by means of a suitable caliber gauge or measuring device, not shown, the roll gap for the corresponding roll stand 10 or 11 can therefore be hydraulically adjusted by the loading device 51 j so that any error caused by the stand is produced in the desired material dimension can be continuously corrected for the subsequent part of the material to be rolled.

An important feature of this arrangement is the attachment of the rollers. 20 and 21 for adjusting the nip is that the arms 24 and 25 are pivotally mounted in the stand 15 instead of being slidably mounted in a linear manner, as is the case with conventional rolling mills, whereby they are considerably small ' form greater inertia (for example, only five eighths as much) of the hydraulic loading device 51 for a given total mass of the arms 24 and 25. This results in a higher frequency response or a response with a higher frequency for a given capacity of the loading device 51, which not only enables a faster correction of the errors generated in the rolling process in the stand

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BATH ORIGINAL

but also a more precise control of the evoked Failure.

Another feature of this embodiment of the invention consists in that, by removing the bolts or pins 47, each arm 24 or 25 can easily be removed from the frame 15 can be removed through the opening 28. This enables the entire roller structure on each arm 24 or take 25 out for maintenance if / is desired. Viewed generally, the embodiment shown in FIGS. 1 and 2 is clear or concise and reached unobstructed working level height for the rolling mill (as indicated at 30). In addition, the work roll and shaft assembly can be easily removed for maintenance.

The way in which the shafts where the reels 20 and 21 are rotatably mounted, in the arms 24 and 25 are arranged in this embodiment, allowed a limited pivoting movement of the shafts in a plane which includes the line of material 14, against a force measuring element 60 (Fig. 5)> whereby the tension or compressive force created in the material 14 by the corresponding roll stand is determined or can be measured. This way of mounting the work roll shaft is more precise in FIG simultaneous patent application by the applicant beschriebaa, which under the title "material tension control for rolling mills "was filed on the same date.

It can be seen that, if it is not necessary, to measure the rolling load applied between the two rollers 20 and 21 directly, the lower arm 25 not needs to be pivotably mounted in the frame 15,

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but can rest firmly on an adjustable stop instead of the element 50, only the upper arm 24 being pivotable hinged asb to the roller gap adjustment.

The separator 52 can also be used to remove the Separate work rolls when there is no material between them in order to remove them for replacement to facilitate.

An advantage of this embodiment is that only a single nip actuator is required in each stand, eliminating the need for a system for synchronizing the activity of two actuating devices is omitted, which would normally be required in a conventional rolling mill set-up.

After Pig. 4, each support roller 22 and 23 is rotatably attached its frame arm 24 and 25 by means of a stub shaft 60 stored. This type of attachment is used to

rolling ^
means to reduce the support part. Each stub shaft carries a partially spherical bearing surface 61 which cooperates with a bearing surface 62 which is formed on the inner surface of the inner race 63 of a ball or roller bearing 64, the outer race 65 of which is mounted in the roller 22. The bearing surface 61 is provided with a keyway 66 which is movable in a mating groove 67 in the bearing surface 62. It can be seen that the cooperating surfaces 61 and 62 create a self-adjustment of the backup rolls on their associated work rolls.

This self-aligning arrangement would normally only be used on a carbon steel bar rolling mill or bars. For higher loads, which

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occur when rolling alloy steels that need Backup rolls 22 and 23 not to be self-adjusting, instead, domed backup and work rolls were used.

7 shows a modified embodiment in which the work rolls 20, 21 on pivotably mounted bearings. C-e ™ arming arms 24, 25 are attached as before, but Each back-up roll is rotatably mounted on the rolling mill stand 15; is. As shown, the roller itself is provided with one-piece solid stub shafts 70, each of which rotatable in tapered roller bearings 71 ur-d 72 ge ^ egsrt, Instead of the only one itself once e__e: .lin actuating device 51 for the rolling mill set sxnd two Screw spindle actuation devices 73, 74- provided, on the outer races of the bearings 71 and works. The inertia of this arrangement is higher than that of the first embodiment, but still considerable lower than the usual systems. This arrangement forms a rolling mill which is stiffer or more rigid and can absorb larger rolling loads.

An alternative method of setting or leveling This <\ j? with "üwalzenspaltes" is as follows Support roller axes are always in the same direction offset from the plane which the worker's axes includes. When the work rolls turn out to be a Couple moving to and from the plane including the back-up roll axes will consequently become the Work rolls move along the backup rolls downwards or upwards, whereby the nip is adjusted or controlled.

SAD LOCAL GINAL 909830/021 8

COPY

Other features and advantages of the described rolling mill are described in the two simultaneous applications of the applicants mentioned in. A A particular advantage is that a constant material passage line is achieved due to the Adjustability of the angular position of the arms 24-, 25 about the axis 25. This makes it easier to set up and Setting in front of rolling mills with two or more stands, which means that it is not necessary for conventional rolling mills make an accurate adjustment of the material guides near each stand.

- patent claims -

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GOPf

Claims (9)

Claims sssssssssss 1. Rolling mill stand with a stand and two work rolls, which are rotatably mounted on the stand, thereby characterized in that at least one of the work rolls is rotatably mounted in an arm which is pivotally attached to the stand, whereby an adjustment of the working gap between the rolls is possible will. 2. Rolling mill stand according to claim 1, characterized in that the work rolls are supported by back-up rolls, and that at least one of the back-up rolls is rotatable with its associated work roll the arm is supported. 3. Roll mill stand according to claim 2, characterized in that each work roll with its associated The support roller is mounted in a single or separate arm which is pivotably mounted on the stand is. 4 ·. Rolling mill stand according to claim 3, characterized in that the two arms around a common one Pivot axis are pivotably mounted. 5. rolling mill stand according to claim 1, characterized in that the work rolls of backup rolls are supported and that the support rollers are rotatably attached to the stand in such a way that a relative movement of the support rollers to one another and away from one another is possible. 6. Rolling mill stand according to one of claims 2-4-, characterized in that the back-up roll is rotatably mounted on a stub shaft formed on the arm. 9038 30/0218 7 · Rolling mill stand according to claim 6, characterized in that g e k en η that the support roller is mounted on the stub shaft by means of a self-adjusting bearing is. 8. rolling mill stand according to claim 6 or 7 _? characterized in that devices are provided for adjusting the work roll gap and that the devices have an adjustable actuating device which acts on the stub shaft. 9. rolling mill stand according to claim 8, characterized in that a load measuring device between the one stub shaft and the stator is attached to generate a rolling load indicating Signals. 909830/0218