JP2023517223A - Rolling stand for rolling metal strip - Google Patents

Abstract

SOLUTION: The invention relates to a roll stand 100 for rolling a metal strip 200, the roll stand comprising a small work roll 110 and a large work roll 120 arranged opposite each other, Together they define a rolling nip for rolling the metal strip 200 and have additional rolls 111 via which the small work rolls 110 are supported, whereby , the small work roll 110 has a smaller diameter with respect to the additional roll 111 , and the additional roll 111 has a smaller diameter with respect to the large work roll 120 . a support device (150) acting horizontally on at least one side for said small work roll 110 according to the invention; 160 are provided.

Description

The invention relates to a roll stand for rolling metal strip and to a roll line with a plurality of roll stands according to the invention arranged one behind the other in the direction of material flow.

The invention relates to a rolling stand, in particular with an odd number of rolls, more particularly with 3, 5 or 7 rolls.
In contrast to conventional double-, quadruple- or sextuple-roll stands with 2, 4 or 6 rolls, in the case of the roll stand according to the invention, the respective upper Or the lower conventional work rolls are replaced by one small work roll and an additional roll respectively above or below the metal strip to be rolled. Such rolling stands are basically known in the prior art.

DE 10 2005 025 302 A1 therefore discloses a rolling stand with five rolls, the upper work roll being made particularly small, in particular smaller than the lower work roll.
The arrangement of work rolls with smaller diameters provides the concomitant advantage that high-strength steels with greater resistance to deformation can be rolled more easily. This is because the required rolling force can be reduced due to the smaller work roll diameter.

US Pat. No. 6,200,000 likewise discloses a rolling stand with five rolls arranged one above the other, the upper work roll having a smaller diameter than the lower work roll. . This document 2 recommends this stand structure, in particular for the asymmetric rolling of clad steel sheets.
The clad steel plate has different deformation resistances on the upper and lower sides of the clad steel plate and therefore
It is recommended to roll this type of strip with different peripheral speeds of the work rolls, so that this can be achieved with work rolls having different diameters at the same drive speed. The upper second work roll has the same diameter as the conventional work rolls, i.e. the first work roll and the second work roll are arranged together with the work rolls overlapping each other. If so, it has a greater height than the traditional individual work rolls.
Work rolls with a smaller diameter are used on the side of the clad material to be rolled with greater deformation resistance; and conversely, work rolls with a larger diameter are used on the side of the clad material with less deformation resistance. It is attached on the side.
Work rolls with a smaller diameter are pivotably arranged relative to conventional work rolls with a larger diameter; and swivel detachable. That is, the smaller diameter work rolls can be mounted in the vertical direction of force transmission or can be swiveled out, and in the latter case the roll stand is a standard quadruple- It can be operated as a roll stand, in which the work rolls lying opposite each other have the same diameter. Therefore, the rolling stand disclosed in US Pat. No. 5,800,004 offers extended rolling possibilities.
Switching between both roll positions described, however, does not only involve swiveling back or swiveling away of the work rolls with the smaller diameter, respectively, which are arranged above the small work rolls inside the rolling stand. It also requires vertical movement of both rolls attached.

See also US Pat. This patent document generally describes four rolls arranged one above the other, namely two inner work rolls defining a mill roll nip and an upper support positioned above the upper work roll. A traditional quadruple-rolling stand is disclosed having rolls and a lower support roll positioned below the lower work rolls.
For both work rolls, which are assumed to have the same diameter here, a respective two-sided, horizontal, hydraulic support device is provided, with a support shell body in each case. , is pressed against the surface of one of these work rolls, and in doing so, the lubricant is pumped into the intermediate space between this support shell body and the respective work roll by means of a pumping device. pumped to. The disclosed horizontal support device is utilized in particular to increase the overall horizontal stiffness or stability of the stand, which is particularly useful for cold rolling thin strips with high deformation resistance. advantageous in some cases.

JP 2010-075985A JP-A-61-245904A EP 0 114 795 A

The problem underlying the invention is to improve the known rolling stand with an odd number of rolls arranged one above the other in such a way that lateral deflection of the small work rolls is effectively prevented. is.

This problem is solved by the subject matter of claim 1.
Accordingly, the rolling stand according to the invention comprises:
a supporting device acting horizontally on at least one side for said small work rolls;
and a positioning device for horizontal positioning of the support device relative to the small work roll.

Advantageously, the support device supports the small work roll not only on one side, but rather on both sides.

Due to the claimed support device arrangement lateral deflection of the small work rolls is effectively prevented and with this the overall stiffness of the roll stand with an odd number of rolls is increased.
Due to the stability of the additional rolls, which are arranged between the small work rolls and the second support roll or the second intermediate roll, the stability of the entire rolling stand requires support devices The performance is compared with the work roll stability in conventional roll stands with 4 or 6 rolls arranged on top of each other in which both rolls have the same diameter. less in

By the concept "work roll" is meant in the sense of the invention a roll which is in direct contact with the rolling stock and which carries out the deformation operation.

Different size work rolls are provided. The work rolls referred to in the present application as large work rolls correspond to the typically used, regular work rolls in practical use.

When using a small work roll, this small work roll always replaces a large work roll in combination with an additional roll, thus giving a roll set with an odd number of rolls.

Within the scope of this specification, the term "positioning device" advantageously operates hydraulically for variable position adjustment of the support device, in particular the support shell body of this support device, relative to the small work rolls. Not only devices, but explicitly also static, i.e. non-variable holding devices for fixed positioning of support devices on small work rolls.

According to the invention, in terms of size ratio, it is provided that the small working roll has a smaller diameter with respect to the additional roll and this additional roll has a smaller diameter with respect to the large working roll.

It is possible for the roll stand according to the invention to alternatively be formed with support rolls and/or intermediate rolls or without support rolls and/or intermediate rolls.

In a variant of the first advantageous embodiment,
a first support roll for supporting the large work roll;
A second support roll is provided for supporting the additional roll,
Both support rolls then have a larger diameter than the large work roll.
It is particularly advantageous in this connection that both support rolls have the same diameter.

In yet another embodiment variant,
a first intermediate roll positioned between the large work roll and the first support roll and a second intermediate roll positioned between the additional roll and the second support roll; is provided,
The first intermediate roll then has a larger diameter with respect to the large work roll and a smaller diameter with respect to the first support roll, and
This second intermediate roll has a larger diameter with respect to the additional roll and a smaller diameter with respect to the second support roll.
It is particularly advantageous in this connection that both intermediate rolls have the same diameter.

Various drive concepts are possible according to the invention for the drive of the rolls of the rolling stand.

In one embodiment variant, the roll stand has only one drive for the rotary drive of a single large work roll. Alternatively, it is possible for the drive to additionally drive the additional roll.
In the case of simultaneous driving of the large working roll and the additional roll, it must be ensured that the drive drives both rolls with the same direction of rotation and possibly with an adapted speed of rotation.

In yet another embodiment variant, the roll stand has a drive for the rotational drive of the first support roll and/or the second support roll. It must be noted that in the case of simultaneous driving of the first and second support rolls, the drives drive both rolls in the same direction of rotation respectively.

In yet another embodiment variant, the roll stand has a drive for the rotational drive of the first intermediate roll and/or the second intermediate roll. In the case of simultaneous driving of the first intermediate roll and the second intermediate roll, it should be noted that the drives drive both rolls in the same direction of rotation respectively.

Generally, in this case, in an odd number of rolls according to the invention in a roll stand, it is ensured that both work rolls, which together define the roll nip, work together and not against each other. benefits are given.

Advantageously, the small working roll and the additional roll are arranged in a connected and rotatably supported manner in the exchange insert.

According to a further embodiment, the supporting device has at least one supporting shell body for at least one-sided, preferably two-sided pressing against the small work roll.
A pumping device is provided for pumping fluid into the intermediate space between the at least one support shell body and the small work roll.
The support device is advantageously located inside the aforementioned exchange insert. This is also space-saving and particularly significant as well. This is because the supporting device is provided according to the invention only for small work rolls.

The fluid pumped into the intermediate space, which is preferably formed in the form of a cooling lubricant, serves as a hydrostatic cushion and likewise for effective cooling of the small work rolls. be done.
The size of the intermediate space, but also the stability of the horizontal support, can be varied by adjusting the pressure value of the fluid and/or by the volumetric flow rate of this fluid.
The setting and adjustment of the pressure and/or volumetric flow are in this case intended for the occurrence of optimum horizontal support.

Since the claimed replacement insert only concerns the small working roll and the additional roll, the flatness adjusting elements of all other rolls, i.e. the support rolls and/or the intermediate rolls, are in function outside the replacement insert. remain unchanged; and
This concerns, for example, a bending cylinder for roll bending, a continuously variable crown CVC positioner for axial movement, a positioner for horizontal movement, or a zone cooling device.

The outer geometrical dimensions, in particular the total height of the exchange insert with the small working rolls and the additional rolls, are at least partially equal to the outer geometrical dimensions, in particular the large working rolls located opposite each other. The diameter of the rolls or the diameter of a traditional double-, quadruple- or sextuple-rolling stand approximately corresponds.
Accordingly, the invention can be replaced particularly easily within the scope of modernization. In new installations deviations of up to 30%, preferably up to 20% are permissible compared to large work rolls.
A traditional double-roll stand with two rolls arranged one above the other, on top of each other, to the roll stand according to the invention with an odd number of rolls and a small working roll as well as an additional roll. Conversion of a quadruple-roll stand with four rolls arranged on top of each other or a sextuple-roll stand with six rolls arranged on top of each other, in which case the claimed replacement inserts can be used very easily and quickly. This is because the size of the replacement insert fits well into existing receptacles for conventional work roll chocks.
With the claimed replacement inserts, therefore, the roll stand can be enlarged very flexibly with respect to the rolling possibilities of this roll stand. The same is true for the classic double-, quadruple- or hexa-fold return structure (Reckbau).

The invention can also be used for expanding rolling possibilities in individual roll stands or tandem rolling lines in unidirectional or reversible operation.
In the use of a roll stand according to the invention in connection with only one driven roll, the effect on the structure due to asymmetric roll gap ratios (small and large work rolls with different diameters) is taken into account. It should be. A positive effect on the structure of the metal strip to be rolled in the case of so-called traction drives results from the movement of the flow boundary between driven and non-driven work rolls. Active adjustment of the rotational speeds or rotational torques of the individual drives can be accompanied by a further active adjustment of the mill roll gap.
Adjusting for small work roll horizontal misalignment and for total insert or other roll misalignment via displacement/movement of the support shell body can be based on process models and/or specifically measured. set or adjusted with reference to the required parameters of strip tension, rolling force and/or rolling torque.

In addition, the roll stand according to the invention allows higher rolling speeds than conventional roll stands, in particular likewise known multi-roll roll stands; be. Of course, however, standard treatment methods for products other than thin strips, which likewise consist of high-strength steel, are also possible to a more limited extent.
The roll stand according to the invention is used in particular for the cold rolling of high-strength thin metal strips.

Horizontal misalignment of the exchange insert relative to the small working roll and the additional roll can be minimized by means of a pressing device so that the lateral forces on the support shell body are minimized or within the effective range for loading. adjusted as adjusted within.
In that case, in single or twin drive, the measured motor currents can be used for horizontal force calculation. This is completely impossible in gear transmission drives due to the unknown rotational torque distortion.

During placement of the exchange insert above the metal strip:
Since the roll nip friction is usually less due to the cooling lubricant on the upper side, the drive power is transmitted via the lower side with reduced risk of slipping.

Upon placement of this insert below the metal strip:
Only a small amount of the cooling lubricant flowing out of the support shell reaches the top of the strip. On the upper side, conventional cooling and lubrication systems or systems for strip blowing can be used in a known manner.

Reduced roll nip friction for small, non-driven work rolls with additional cooling lubricant application, concentrate/additive, or cooling lubrication with added condensate/additive fraction It can be achieved by applying an agent.

It is possible that the exchange insert as a whole is integrated into a bending system or an axial/horizontal movement system.

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 view of one embodiment variant of a rolling stand according to the invention; Fig. 3 shows different positions of a rolling stand according to the invention with the arrangement of small working rolls and additional rolls above the metal strip; Fig. 3 shows different positions of a rolling stand according to the invention with the arrangement of small working rolls and additional rolls under the metal strip;

FIG. 1 shows in the right half of this FIG. 1 an embodiment variant for a rolling stand 100 according to the invention for rolling a metal strip 200 . This rolling stand has a small work roll 110 , an additional roll 111 in this active connection and a large work roll 120 .
As can be discerned from FIG. 1, the small work rolls 110 and the large work rolls 120 define a roll nip for rolling the metal strip 200 . The additional roll 111 has a larger diameter than the work roll 110 but a smaller diameter than the large work roll 120 which is arranged opposite this small work roll 110 .

Advantageously, the sum of the diameters of the working roll 110 and the additional roll 111--in the mutually overlapping vertical arrangement--corresponds approximately to the diameter of the large working roll 120; This is especially true for small work with conventional work rolls whose diameter corresponds to the sum of both rolls 110, 111, especially when these rolls are rotatably arranged in the exchange insert 130. To facilitate replacement of a roll 110 and an additional roll 111. - 特許庁
In the left half, in comparison with the above, a conventional work roll 140 is shown together with the chock or bearing housing 141 of this conventional work roll. According to the invention, the outer geometrical dimensions, in particular the total height of the exchange insert 130 with both rolls 110, 111, are adjusted to the outer geometrical dimensions, in particular the work rolls 120 located opposite each other and the conventional work. Matches the diameter of roll 140 . An easy exchange is thus possible very simply and quickly.

Identicality is sought to be achieved in the ideal case, although deviations can already occur from the wear area of the rolls used. Deviations from the configuration can also occur. Deviations of up to 20% in general, upwards or downwards, are acceptable.

In FIG. 1 it can also be recognized that the small work roll 110 is horizontally supported against horizontal or lateral deflection, preferably on both sides, by means of horizontal support devices 150. be. For this purpose, the support device 150 is aligned with respect to the small work roll 110 using, for example, a hydraulically actuated alignment device 160 . More precisely, not all of the support devices 150 are aligned, but rather only the support shell bodies 155 of these support devices are aligned with respect to the small work rolls 110 .
Furthermore, a pumping device 170 is provided for pumping fluid or cooling lubricant into the intermediate space 175 between the support shell body 155 and the small work roll 110 . Advantageously, this is done for both sides of the small work roll 110 as shown in FIG.

FIG. 2 shows, in partial views a) to i), different embodiments of the rolling stand 100 according to the invention, in which small work rolls 110 supported with additional rolls 111 are respectively are positioned above the metal strip 200 to be rolled.
Embodiment a) then corresponds to the first embodiment described above in connection with FIG. It is characteristic of this embodiment that only the large work roll 120 arranged below the metal strip 200 is rotationally driven in accordance with the direction of rotation of the arrow. All other rolls of the rolling stand 100, and especially the small work roll 110, are not driven in rotation.
In contrast to embodiment a), in embodiment b) the additional roll 111 as well as the large working roll 120 arranged below the metal strip 200 are driven in rotation, corresponding to the direction of rotation of the arrow. .

The examples according to FIGS. 2c) to 2e) each relate to a rolling stand with five rolls. In comparison with the previous embodiments, these embodiments additionally comprise a first support roll 180 and a second support roll 185 .
The first support roll 180 is in operative connection with the large work roll 120 and has a larger diameter with respect to this large work roll. The second support roll 185, on the other hand, is in active connection with the additional roll 111 and has a larger diameter with respect to this large additional roll.
The drive concept of embodiments 2c) and 2d) then corresponds to the drive concept of embodiment 2a) or 2b). For example 2e) only the first support roll 180 or only the second support roll 185 or the first support roll 180 as well as the second support roll 185 at the same time , can be driven in rotation corresponding to the direction of rotation of the arrow.

The examples according to FIGS. 2f) to 2i) each relate to a rolling stand with 7 rolls. In comparison with the previous embodiments, these embodiments additionally comprise a first intermediate roll 190 and a second intermediate roll 195 .
The first intermediate roll 190 is then arranged between the first support roll 180 and the large work roll 120 and has a larger diameter with respect to this large work roll 120, and It has a smaller diameter for this first support roll 180 . The second intermediate roll 195 is then arranged between the second support roll 185 and the additional roll 111 and has a larger diameter with respect to this additional roll 111 and 2 support rolls 185 have a smaller diameter.
The drive concept of embodiments 2f) and 2g) then corresponds to the drive concept of embodiments 2a) to 2d).
For embodiments 2h) and 2i) only the first support roll 180, or alternatively only the first intermediate roll 190, or only the second support roll 185, or , optionally only the second intermediate roll 195, or
The second support roll 185 as well as the first support roll 180 or, alternatively, the second intermediate roll 195 as well as the first intermediate roll 190 are at the same time corresponding to the direction of rotation of the arrow, It can be rotationally driven.

FIG. 3 shows, in partial views a) to i), different embodiments of the rolling stand 100 according to the invention, in which small work rolls 110 supported with additional rolls 111 are respectively , is positioned below the metal strip 200 to be rolled.
To that extent, the explanations made earlier for the embodiment illustrated there in connection with FIG. 2 apply equally or analogously to the embodiment according to FIG.

The invention is not limited to the combinations of features specified in the independent claims, but rather by any other combination of the given features, given features, of all the individual features disclosed as a whole. can also be specified.
This basically means that, in practice, each individual feature of the independent claim can be omitted or replaced by an individual feature disclosed in at least one other position in this application. means
To that extent, the independent claims should be understood only as a first attempt at expression for the invention.

100 Roll stand 110 Small work rolls 111 Additional rolls 120 Large work rolls 130 Replacement insert 140 Conventional work rolls 141 Chock/bearing housing 150 Hydraulic support device 155 Support shell body 160 Alignment device 170 For cooling charge lubricant pump device 175 intermediate space 180 first support roll 185 second support roll 190 first intermediate roll 195 second intermediate roll 200 metal strip

Claims (16)

A roll stand (100) for rolling a metal strip (200), the roll stand comprising:
It has a small work roll (110) and a large work roll (120) arranged opposite each other, which together define a rolling gap for rolling said metal strip (200). cage,
It has an additional roll (111) via which said small work roll (110) is supported, said small work roll (110) being directed against said additional roll (111). and said additional rolls (111) have a smaller diameter relative to said large working rolls (120).
In the rolling stand (100),
a support device (150) acting horizontally on at least one side for said small work roll (110);
a position adjustment device (160) for horizontal position adjustment of said support device (150) relative to said small work roll (110);
A rolling stand (100), characterized in that: a first support roll (180) for support of said large work roll (120);
a second support roll (185) for supporting said additional roll (111);
Rolling stand (100) according to claim 1, characterized in that both support rolls (180, 185) have a larger diameter with respect to the large work roll (120). 3. Rolling stand (100) according to claim 2, characterized in that both support rolls (180, 185) have the same diameter. a first intermediate roll (190) positioned between said large work roll (120) and said first support roll (180);
the first intermediate roll (190) has a larger diameter with respect to the large work roll (120) and a smaller diameter with respect to the first support roll (180); and ,
a second intermediate roll (195) positioned between said additional roll (111) and said second support roll (185);
this second intermediate roll (195) has a larger diameter with respect to said additional roll (111) and a smaller diameter with respect to said second support roll (185);
Rolling stand (100) according to claim 2 or 3, characterized in that: 5. Rolling stand (100) according to claim 4, characterized in that both intermediate rolls (190, 195) have the same diameter. a drive is provided for the rotational drive of said large working roll (120) and - optionally - additionally said additional roll (111); or
a drive is provided for rotational driving of said first support roll (180) and/or said second support roll (185); or
A drive is provided for the rotational drive of the first intermediate roll (190) and/or the second intermediate roll (195),
Rolling stand (100) according to any one of claims 1 to 5, characterized in that: In the case of driving the large working roll (120) and additionally the additional roll (111), the drive device:
7. A rolling mill according to claim 6, characterized in that both rolls (111, 120) are designed to be driven in rotation with the same direction of rotation and, if appropriate, with an adapted speed of rotation. Stand (100). In the case of driving the first support roll (180) and the second support roll (185), the drive device comprises:
7. Rolling stand (100) according to claim 6, characterized in that both support rolls (180, 185) are configured to be rotationally driven in the same direction of rotation respectively. When driving the first intermediate roll (190) and the second intermediate roll (195), the drive device
7. Rolling stand (100) according to claim 6, characterized in that both intermediate rolls (190, 195) are configured to be rotationally driven in the same direction of rotation respectively. said support device (150) comprises at least one support shell body (155) for at least one-sided pressing against said small work roll (110); and
a pumping device (170) is provided for pumping fluid into an intermediate space (175) between said at least one supporting shell (155) and said small work roll (110);
A rolling stand (100) according to any one of claims 1 to 9, characterized in that 11. Claims 1 to 10, characterized in that said small working roll (110) and said additional roll (111) are arranged in an exchange insert (130) in an articulated and rotatable manner relative to each other. A rolling stand (100) according to any one of the preceding claims. The outer geometrical dimensions, in particular the total height of said exchange insert (130) with said small working rolls (110) and said additional rolls (111) are
12. Rolling stand (100) according to claim 11, characterized in that it corresponds, at least in part, to the outer geometrical dimensions, in particular the diameter of the large work roll (120). attached to said exchange insert (130) with said small work rolls (110) and said additional rolls (111), said support rolls (180, 185) and/or said intermediate rolls (190, 195); 13. Rolling stand (100) according to claim 11 or 12, characterized in that at least one flatness adjusting element is provided. 14. Roll stand (100) according to any one of the preceding claims, characterized in that the roll stand (100) is an individual roll stand or a tandem rolling line in unidirectional or reversible operation. 15. The roll stand according to any one of the preceding claims, characterized in that the roll stand (100) is formed as a cold roll stand for cold rolling of the metal strip (200). (100). With a plurality of rolling stands (100) arranged one behind the other in the material flow direction, characterized in that the rolling stands (100) are formed according to any one of claims 1 to 15 Tandem type rolling line.

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