JP2023520411A - rolling stand - Google Patents

Abstract

The invention relates to a roll stand (1) for rolling metal strips, which roll stand comprises a first roll housing (3) arranged on the drive side and a second roll arranged on the operating side. housings 5, each of said roll housings 3, 5 having chocks 8, 9 for the rotatable bearing of a roll 10 with a roll neck and not axially displaceable. said roll stand comprising at least two locking plates 11, 12, 13, 14 for locking said chocks 8, 9; A locking plate 11 , 12 , 13 , 14 in each case is thereby arranged on the roll-remote end side of each roll housing 3 , 5 and at least one axial force measuring bolt 15 . , 16, 17, 18 in at least form-fitting engagement with said roll housing, each of said locking plates 11, 12, 13, 14 is positioned in at least one of said respective receiving openings 6, 7. and thus induced during the rolling process and through the roll necks, the chocks 8, 9 and the lock plates 11, 12, 13, 14 in the axial direction. An axial force transmitted to at least one of the force measuring bolts 15, 16, 17, 18 is detectable by the respective said axial force measuring bolt 15, 16, 17, 18. .

Description

The present invention relates to a roll stand for the rolling of rolled metal stock in hot or cold rolling processes.

Rolling stands for rolling metal strips are basically known from the prior art. In a rolling stand without axially displaceable rolls, each work roll is rotatably mounted via two roll necks, each in one chock, also called bearing housing, and , which are axially supported without play.
In the ideal case, therefore, only forces extending transversely to the longitudinal axis of the work rolls should occur within the rolling process.

This ideal case is, however, rarely realizable in practice. This is because the work rolls are exposed to various disturbances from the rolling process. Thus, for example, asymmetries within the rolled stock to be rolled cause significant disturbances in the rolling process.
These disturbances induce axial movements or forces of the roll to be compensated for. Due to the axial play-free mounting of the work rolls, this has a negative effect on the rolling quality of the material to be rolled and on the bearings installed in the chocks. influence.

DE 10 2005 004 003 A1 discloses a roll housing on the operating side, which has a work roll rotatably mounted in a chock.
A chock located in the roll housing on the operating side is locked against axial movement by means of a locking plate. The locking plate is screwed with the roll housing on the operating side using preloaded screws. The elongated screw has a strain gauge via which only the axial force of the work roll extending in the direction of the roll housing on the operating side can be measured.

A further device for measuring the axial force in the roll housing on the operating side is additionally known from US Pat. This device has a bolt with a strain gauge, which is arranged in the roll housing on the operating side and is preloaded and screwed with this roll housing.

Chinese Patent Application Publication No. 102327902A Chinese Utility Model No. 205413924U

Against this background, the problem underlying the present invention is to provide a rolling stand with which improved product quality can be achieved in the rolled strip, and This rolling stand is more maintenance free.

According to the invention, this task is solved by a rolling stand having the features of claim 1 .

A roll stand according to the invention is provided for rolling a metal strip and comprises a first roll housing arranged on the drive side and a second roll housing arranged on the operating side. there is
Each roll housing of said roll housings has at least one receiving opening for a chock for the rotatable bearing of a roll which is not axially displaceable with a roll neck. Furthermore, the roll stand comprises at least two locking plates for locking the chocks--and the rolls supported therein--against axial movement of the roll housings outwards.
Each at least one locking plate is arranged on the end side of each roll housing remote from the rolls. Furthermore, said roll housing is provided with at least two axial force measuring bolts.
Each lock plate of the at least two lock plates is rotatably supported in the chocks in which it is arranged against axial movement--in its position during the rolling operation. With the rolled roll positioned in the advanced position it covers at least a portion of the respective receiving opening for locking.
In this advanced position the locking plates are each connected in at least form-fitting engagement with said roll housings via at least one axial force measuring bolt and thus during the rolling process an axial force induced throughout and transmitted through said roll neck, said chock and said lock plate to at least one of said axial force measuring bolts on each said axis; It can be detected by a directional force measuring bolt.

The present invention results from an installation that occurs in the process by sensing the axial force of the work rolls not only in one direction, but rather in both axial directions, i.e. towards the working and driving sides of the roll stand. and/or based on the important recognition that process-induced disturbance quantities can be better recognized and, thus, qualitatively controlled.
This has a particularly favorable effect on the product quality and wear of the rolling stock to be rolled, which leads to reduced maintenance costs of the roll stands.

According to the invention, this is achieved in that both roll housings are of essentially identical design, so that the axial force induced during the rolling process is in any axial direction acting on at least one of the axial force-measuring bolts via roll necks, chocks and lock plates, and therewith can be detected by

Control of the amount of equipment-induced and/or process-induced disturbances detected may be performed manually, for example, by an operator. Advantageously, however, it is intended that these disturbance quantities be automated and controlled.
For this purpose, the rolling stand advantageously has a control circuit with RAC programming (Roll Alignment Control) and/or TFC programming (Thrust Force Control). , said programming correspondingly acts on the hydraulic adjusting elements of the rolling stand as a function of the values detected by the axial force measuring bolts.

Further advantageous embodiments of the invention are presented in the dependent claims. The features recited individually in the dependent claims can be combined with each other in an industrially effective manner and define further embodiments of the invention.
In the following, the features recited in these claims will be defined and explained in greater detail in the specification, in which further advantageous embodiments of the invention are realized.

In a variant of the first advantageous embodiment of the invention, each locking plate of at least two said locking plates is connected via said at least one said axial force measuring bolt to a respective one of said axial force measuring bolts. The axial force measuring bolt is connected in form-fitting engagement with the roll housing so that it is not preloaded.
It has been found that this non-preloading of the axial force measuring bolt results in a particularly high measuring resolution. This is because all introduced axial forces are measurable. It has proven to be particularly advantageous in this connection if each axial force-measuring bolt of the axial force-measuring bolts is connected to the rolling stand in form-fitting and material-fitting engagement.
Typically, the axial force-measuring bolt has a threaded portion at both ends of the axial force-measuring bolt. Via the first threaded portion, the axial force measuring bolt is screwed in form-fitting engagement with the rolling stand. Via the second threaded part, the locking plate is fixed with a measuring bolt nut, preferably with an air gap.
In order to ensure the absence of play in both threads, both threads are additionally glued in material engagement, for example with a thread adhesive.

In a further advantageous embodiment variant, the at least one locking plate arranged on the drive side is non-movable and the at least one locking plate arranged on the operating side is configured to be movable. It is
Via the horizontally displaceable locking plate, the roll change can be carried out particularly easily. The locking plates, which normally protect the chocks in the roll stand against axial movement, are moved laterally outwards for roll change and then each chock is placed into operation of the roll stand. Release for sideways removal.
This embodiment variant has a particularly advantageous effect if the axial force measuring bolt is not tightened with a locking plate and the locking plate is additionally horizontally freely movable. This is because in that case the time-consuming removal of the axial force-measuring bolts for roll change can be saved.
Very particularly advantageously in this context at least one locking plate arranged on the operating side is provided with an actuator via which the at least one locking plate is displaceable and thus It is contemplated that roll change can occur semi-automatically or fully automatically.

It is possible for the actuator to be formed, for example, in the form of a hydraulic cylinder or in the form of a screw drive.

In a further advantageous embodiment, the axial force-measuring bolt arranged on the operating side has a larger overall diameter compared to the axial force-measuring bolt arranged on the drive side. The larger dimensioning of the diameter then compensates for the unfavorable lever arm on the locking plate arranged on at least one operating side.

The concept "total diameter" means in the sense of the invention the diameter averaged over the entire length of the axial force-measuring bolt.

Particularly preferably, the roll stand is provided with at least two, preferably four or eight locking plates, so that each chock of said chocks has at least two or even four locking plates. is intended to be lockable via

In order to generate a symmetrical lever movement (Hebel) in each locking plate, each locking plate is advantageously connected via at least two axial force-measuring bolts to the respective roll housing and at least the shape It is intended to be connected in engagement by means, particularly advantageously in form engagement and material engagement.

Advantageously, each axial force-measuring bolt of said axial force-measuring bolts is
a first threaded portion disposed at a first distal end;
a second threaded portion disposed at the second distal end;
an intermediate portion disposed between the first threaded portion and the second threaded portion;
comprising an essentially cylindrically formed base body having a
This middle part
at least one radial transverse bore opening into a central longitudinal bore of said axial force measuring bolt;
at least one strain gauge disposed on the outer mantle surface of the axial force measuring bolt and spaced from the transverse bore.

Due to the transverse drilling required for the electrical connection of the strain gauge, the axial force measuring bolt, and especially the intermediate part, is asymmetrically loaded by the axial force introduced. In doing so, the direct area around the perimeter of the transverse drilling is exposed to particularly high loads. It has unexpectedly been found that the axially spaced arrangement of the strain gauge with respect to the transverse drilling has a particularly beneficial effect on the quality of the measurement results.
In this connection, the strain gauges each have a minimum distance from the transverse drilling, and this minimum distance is at least 1.5 times the diameter of the transverse drilling, particularly preferably It is particularly preferred if it corresponds to at least twice this diameter and very particularly preferably 3 to 5 times this diameter. This distance is then associated with the center point of the transverse drilling with respect to the center point of the strain gauge.
With respect to positional arrangement, at least one said strain gauge is arranged with said transverse drilling on a common generatrix, on a common circular line and/or on different generatrices and circular lines. It is possible.
It is noted that in this positioning the strain gauge should be positioned on the surface of the axial force measuring bolt so that the strain gauge can detect the resulting axial elongation of the strain gauge. I have to. Extension or strain changes the resistance of the strain gauge, which can then be converted into an axial force.

In a very particularly advantageous embodiment variant, the intermediate part extends transversely to the longitudinal axis of the axial force-measuring bolt in the region of the at least one transverse drilling on the surface of the intermediate part. and at least one pressure relief groove.
In this connection, preferably the at least one pressure relief groove has a minimum length, and this minimum length is at least 2/10 of the diameter of the intermediate portion, more preferably It is intended to correspond to at least 3/10 of the diameter of the intermediate portion, and particularly preferably at least 4/10 to 6/10 of the diameter of the intermediate portion. Via the at least one pressure relief groove arranged in the region of the transverse drilling, the loads resulting from the introduced axial force are further reduced and the quality of the measurement results is improved.

Furthermore, it is advantageously provided that the first threaded portion has a larger diameter with respect to the second threaded portion.
Via the first threaded portion, the axial force measuring bolt is connected with the roll housing of the roll stand in form engagement, preferably form engagement and material engagement. there is Via the second threaded portion, the axial force measuring bolt is preferably engaged in form and/or material engagement, preferably in form and material engagement, with the measuring bolt nut. It can be fixed in the mating state.
The first threaded part can be correspondingly long in order to allow an optimum introduction of force. Optionally, it is possible for the first threaded part to be arranged in the roll housing via a separate threaded bush.

The invention and its technical surroundings are explained in more detail below on the basis of the figures. It should be pointed out that the invention should not be limited by the examples shown. In particular, unless explicitly shown to the contrary, partial aspects of the matter illustrated in the figures may not be taken and combined with other elements and perceptions from the specification and/or figures of the present application. , is also possible.
In particular, it should be pointed out that the figures, and in particular the illustrated size ratios, are only schematic. The same reference numerals refer to the same objects, so that in some cases the description can be taken supplementarily from other figures.

FIG. 4 is a schematic horizontal cross section of an embodiment variant of a rolling stand according to the invention; Figure 2 shows a variation of the embodiment of the axial force measuring bolt shown in Figure 1 in an illustration showing the sleeve and measuring bolt nut together; FIG. 5 is a partial cross-sectional view of an axial force measuring bolt arranged in a rolling stand according to a variant of the above embodiment;

In FIG. 1 there is shown an embodiment variant of a roll stand 1 according to the invention, which roll stand is intended for rolling metal strips. The rolling stand 1 comprises a first roll housing 3 arranged on the drive side 2 and a second roll housing 5 arranged on the operating side 4 .
Each of the roll housings 3, 5 has at least one receiving opening 6, 7 for one chock 8, 9 respectively. The chocks 8, 9 serve for the rotatable support of rolls 10 which have roll necks 8.1, 9.1 and which are not axially displaceable.

The rolling stand 1 shown in FIG. 1 comprises, in the embodiment variant shown here, four locking plates 11, 12 for locking the chocks 8, 9 against axial movement. , 13, 14.
For loading and unloading the rolls from the roll housing, the rolls with the chocks are slid axially through the receiving openings of the roll stands. For this purpose, the receiving opening is released by movement of the locking plates 11-14 transversely to the axial direction.
Advantageously, two locking plates 11 , 12 , 13 , 14 each are arranged at the roll-remote end side of the respective roll housing 3 , 5 at the height of the chocks 8 , 9 . Each of the locking plates 11, 12, 13, 14 is, in the embodiment variant shown here, via at least one axial force measuring bolt 15, 16, 17, 18 the rolling stand 1.
Advantageously, two axial force-measuring bolts, likewise arranged perpendicular to one another, can be provided per locking plate. Based on the horizontal cross-section, in FIG. It is visible every time.

Each of the axial force measuring bolts 15, 16, 17, 18 is in form-fitting engagement with the respective roll housing 3, 5 in the embodiment variant shown here. and advantageously also in material engagement,
Each of the locking plates 11, 12, 13, 14 is joined so that it covers at least part of the receiving openings 6, 7 of the respective roll housings 3, 5 and thus during the rolling process. induced and through roll necks, chocks 8, 9 and lock plates 11, 12, 13, 14 to at least one of the axial force measuring bolts 15, 16, 17, 18 can be sensed by respective axial force measuring bolts 15, 16, 17, 18.
The axial force-measuring bolts 17, 18 arranged on the operating side have, in the embodiment variant shown here, a larger overall diameter than the axial force-measuring bolts 15, 16 arranged on the drive side. have.

The two locking plates 11, 12 arranged on the drive side are preferably non-movable and connected to the roll housing, while the two locking plates 13, 14 arranged on the operating side are configured to be movable. It is
This embodiment variant has a particularly advantageous effect if the axial force measuring bolts 13, 14 do not have any preload against the locking plate. This is because the time-consuming disengagement of the axial force-measuring bolts or locking plates for roll replacement can be saved. For this purpose, the locking plates 13, 14 arranged on the operating side have an actuator (not shown) via which both locking plates 13, 14 arranged on the operating side are activated. 14 can be moved fully automatically.

In order to achieve a particularly high measuring resolution, the eight axial force measuring bolts 15, 16, 17, 18 arranged in the rolling stand 1 are shaped so that they are not prestressed. are joined in engagement by the material and in engagement by the material. This is achieved in the present application by setting an air gap 35 between the measuring bolt nuts 19 of the axial force measuring bolts 15, 16, 17, 18 and the respective locking plates 11, 12, 13, 14. (Fig. 3).
This non-preloading of the axial force measuring bolts 15, 16, 17, 18 achieves a particularly high measuring resolution. This is because all axial forces introduced can be measured. Additionally, the axial force-measuring bolts 15, 16, 17, 18 are then engaged on one side with the roll housings 3, 5 in shape engagement and preferably also in material engagement. and on the other side with the measuring bolt nut 19 being fixed in form-fitting and preferably also material-fitting manner. Bonding by materials is achieved in this application by adhesive bonding.

By detecting the axial forces in both axial directions of the rolls 10, i.e. in the directions of the working side 4 and the driving side 2 of the roll stand 1, the two equipment- and/or process-induced forces occurring in the process are: Three disturbing quantities are recognized so that they can be qualitatively controlled.
This has a particularly favorable effect on the product quality and wear of the rolling stock to be rolled, which leads to reduced maintenance costs of the roll stand 1 .

In FIG. 2 there is shown a variant of the embodiment of the axial force measuring bolt 17 shown in FIG. 1 in which the sleeve 20 and the measuring bolt nut 19 are shown together. The axial force measuring bolt 17 is for example manufactured from chromium-nickel steel 30CrNiMo8 and tempered for a load of 1300 N/m ² .

The axial force measuring bolt 17 is
a first threaded portion 22 disposed at the first distal end;
a second threaded portion 23 disposed at the second distal end;
an intermediate portion 24 disposed between the first threaded portion 22 and the second threaded portion 23;
It has an essentially cylindrically shaped basic body 21 with a .

As can be partially seen from FIG. It has a transverse bore 25 and two strain gauges 27 arranged radially opposite and spaced apart from the transverse bore 25 on the outer mantle of this axial force-measuring bolt.
As can be seen in particular from FIG. 2, the strain gauges 27 and the transverse bores 25 are arranged on a common generatrix in the embodiment variant shown here.

Furthermore, the axial force-measuring bolt 17 is arranged transversely to the longitudinal axis of this axial force-measuring bolt 17 in each of the two transverse drillings 25 in the embodiment variant shown here. It has two extending pressure relief grooves 28,29.
Due to the pressure relief grooves 28, 29 arranged in the region of the transverse bore 25, the loads resulting from the introduced axial forces are further reduced and the quality of the measurement results is improved.

The intermediate portion 24 is arranged in the region to the first threaded portion 22 and the second threaded portion 23, is formed in a raised manner and extends circumferentially, respectively one sealing bearing surface for the sleeve 20. 30, 31 so that this intermediate part 24 and two strain gauges 27 arranged between the two sealing seats 30, 31 on the outer mantle surface are sealed. is sealed with
The sleeve 20 effectively protects the strain gauge 27 from all ambient influences. In order to allow the air gap 35 to be optimally adjustable, the sleeve 20 has a smaller axial extension with respect to the thickness of the locking plates 11,12,13,14.

In FIG. 3 a partial section through the axial force measuring bolt 17 arranged in the rolling stand 1 is shown in longitudinal section. The electrical connections 32 of each strain gauge 27 can then be seen, which extend through the transverse bore 25 and the central longitudinal bore 26 .
Furthermore, on the basis of the figure now in question, the first threaded portion 22, which is connected in form engagement and material engagement with the rolling stand 1, is connected to the second threaded portion 23. It can be seen that it has a larger diameter. In addition, it can be seen from FIG. 3 that the sleeve 20 has two radially extending grooves 33, 34 in which O-rings are inserted (not shown). .

1 rolling stand 2 drive side 3 first roll housing 4 operating side 5 second roll housing 6 receiving opening 7 receiving opening 8 chock 8.1 roll neck 9 chock 9.1 roll neck 10 roll 11 locking plate 12 lock Plate 13 Lock plate 14 Lock plate 15 Axial force measurement bolt 16 Axial force measurement bolt 17 Axial force measurement bolt 18 Axial force measurement bolt 19 Measurement bolt nut 20 Sleeve 21 Cylindrical body 22 First threaded portion 23 Second Threaded portion of 2 24 Intermediate portion 25 Transverse drilling 26 Longitudinal drilling 27 Strain gauge 28 Pressure relief groove 29 Pressure relief groove 30 Sealing seat 31 Sealing seat 32 Electrical connection 33 Groove 34 Groove 35 Air gap

Claims (15)

A roll stand (1) for rolling metal strips, comprising a first roll housing (3) arranged on the drive side and a second roll housing (3) arranged on the operating side ( 5) and
each of said roll housings (3, 5) for at least one chock (8, 9) for rotatable bearing of a roll (10) with a roll neck and not axially displaceable; having two receiving openings (6, 7),
said rolling stand comprises at least two locking plates (11, 12, 13, 14) for locking said chocks (8, 9);
each one of said locking plates (11, 12, 13, 14)
the roll-remote end of each of said roll housings (3, 5) such that said locking plates (11, 12, 13, 14) cover at least part of said receiving openings (6, 7) of said roll housings; arranged on the side, and
in at least form-fitting engagement with said roll housing via at least one axial force measuring bolt (15, 16, 17, 18);
The axial force measuring bolts (15, 16, 17) are induced during the rolling process and through the roll necks, the chocks (8, 9) and the lock plates (11, 12, 13, 14). , 18) are coupled such that an axial force transmitted to at least one axial force measuring bolt in the axial force measuring bolt (15, 16, 17, 18) is detectable by the respective said axial force measuring bolt (15, 16, 17, 18). there is
A rolling stand (1), characterized in that: Each locking plate of said at least two locking plates (11, 12, 13, 14) is connected to said axial force measuring bolt via at least one said axial force measuring bolt (15, 16, 17, 18) characterized in that each axial force measuring bolt of (15, 16, 17, 18) is connected in form-fitting engagement with said roll housing (3, 5) so as not to be preloaded. Rolling stand (1) according to claim 1. The at least one locking plate (11, 12) arranged on the drive side is non-movably connected with the roll housing on the drive side and the at least one locking plate (13) arranged on the operating side. 3. Rolling stand (1) according to claim 1 or 2, characterized in that , 14) are configured to be movable. At least one locking plate (13, 14) arranged on the operating side is associated with an actuator via which the at least one locking plate (13, 14) can be displaced. Rolling stand (1) according to claim 3. the axial force measuring bolts (17, 18) arranged on the operating side have a larger overall diameter compared to the axial force measuring bolts (15, 16) arranged on the drive side; Rolling stand (1) according to any one of claims 1 to 4, characterized in that 6. A roll stand (1) according to any one of claims 1 to 5, comprising at least four locking plates (11, 12, 13, 14), so that the chocks A rolling stand (1) characterized in that each chock of (8,9) is lockable via at least two locking plates (11,12,13,14). At least one of said locking plates (11, 12, 13, 14) is via two or more axial force measuring bolts (15, 16, 17, 18) respectively 7. Rolling stand (1) according to any one of the preceding claims, characterized in that it is connected at least in form-fitting engagement with the roll housings (3, 5) of the . each axial force measuring bolt of said axial force measuring bolts (15, 16, 17, 18) comprising:
a first threaded portion (22) disposed at the first distal end;
a second threaded portion (23) disposed at the second distal end;
an intermediate portion (24) located between the first threaded portion (22) and the second threaded portion (23);
comprising an essentially cylindrically shaped base body (21) having
This middle part
at least one radial transverse bore (25) opening into a central longitudinal bore (26) of said axial force measuring bolt (15, 16, 17, 18);
at least one strain gauge (27) arranged on the outer mantle of said axial force measuring bolt and spaced from said at least one transverse bore (25),
Rolling stand (1) according to any one of claims 1 to 7, characterized in that: at least one said strain gauge (27) has a respective minimal distance to said at least one transverse bore (25); and
9. Rolling stand (1) according to claim 8, characterized in that this minimum spacing corresponds to at least 1.5 times the diameter of the transverse bore (25). At least one said strain gauge (27) with at least one said transverse bore (25) is arranged on a common generatrix, on a common circular line and/or on different generatrices and circular lines. 10. Rolling stand (1) according to claim 8 or 9, characterized in that the stand (1) is Claim characterized in that the intermediate part (24) has pressure relief grooves (28, 29) extending transversely to the longitudinal axis in the region of the at least one transverse bore (25). 11. Rolling stand (1) according to any one of clauses 8-10. 12. The pressure relief grooves (28, 29) according to claim 11, characterized in that they have a minimum length and this minimum length corresponds to at least 2/10 of the diameter of the intermediate part. A rolling stand (1) according to . Said axial force-measuring bolt (15, 16, 17, 18) comprises a sleeve (20) which is provided with two sealing seats (30, 31) spaced apart from each other and extending on the circumferential side. ), so that
8. The strain gauge (27) arranged between the two sealing seats (30, 31) on the outer jacket surface is hermetically sealed. 13. A rolling stand (1) according to any one of 12 to 12. 14. Rolling stand (1) according to any one of claims 8 to 13, characterized in that the axial force measuring bolts (15, 16, 17, 18) are made of chromium-nickel steel. 15. Rolling according to any one of claims 8 to 14, characterized in that the first threaded portion (22) has a larger diameter with respect to the second threaded portion (23). stand (1).

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