Roll stand and method for producing same

Abstract

The invention relates to a roll stand and to a method for producing a roll stand for rolling a strip-shaped material, comprising at least two roll housings (11), at least two work rolls, at least one base (10), and a foundation (12), wherein the base is interposed between at least one of the roll housings and the foundation, and the base is made of an ultra-high-strength concrete (13). The invention additionally relates to the use of ultra-high-strength concrete (13) for a roll stand.

Description

[0001] Rolling stand and method for manufacturing

[0002] The invention relates to a rolling stand and a method for producing a rolling stand for rolling strip material, with at least two roll stands, at least two work rolls, at least one base plate and a foundation, wherein the base plate is arranged between at least one of the roll stands and the foundation.

[0003] Roll stands and methods of the type mentioned above are well known in the art and are used for rolling strip material, such as foil. Such roll stands have at least two work rolls, which are also assigned backup rolls, roll bending devices for the work rolls, and devices for adjusting and balancing the rolls, or the like. The work rolls are supported at their respective ends on roll stands of the roll stand, which in turn are mounted on a base plate. The base plate, in turn, is arranged on a foundation connected to a subsurface. Due to the high weight of the roll stand (several tons), the foundation is usually constructed as a reinforced concrete foundation. The base plate is usually made of, for example, cast steel, cast iron, or structural steel and connects the roll stand(s) to the foundation.The base plate can be designed as a cross member extending in the longitudinal direction of the work rolls and connecting at least two roll stands. However, separate base plates can also be provided for each roll stand, one for the inlet side and one for the outlet side of the roll stand. A roll stand of this type is known, for example, from EP 1 074 3 15 A2.

[0004] Particularly when a rolling mill is to produce strip materials with tight thickness and flatness tolerances, adequate damping and accurate positioning of the rolling mill are crucial. The vibrations and forces that occur during the rolling of strip material are transmitted to the foundation via the roll housings and the base plate(s). Precise positioning and good vibration-damping properties of the base plate therefore influence the quality of the strip material rolled by the rolling mill.

[0005] Due to the good vibration-damping properties of cast steel or cast iron, base plates are often manufactured by casting. Casting and subsequent machining of such a large component, which may weigh several tons, is very complex because, among other things, specific dimensional and shape tolerances must be maintained. Furthermore, such a base plate must then be positioned and aligned relatively precisely on the already finished foundation so that the roll stands can be mounted on the base plate in the correct position relative to other components of a rolling mill. The base plate is usually aligned by inserting metal sheets or similar between the base plate and the foundation. Precise position measurement can be achieved, for example, using a theodolite, a spirit level, or other leveling devices.The respective base plate is lifted several times, for example, by crane, to support the sheet metal, and then repositioned. This type of base plate assembly requires a significant amount of time, in addition to the necessary equipment.

[0006] The present invention is therefore based on the object of proposing a rolling stand and a method for its production which is more cost-effective while improving the quality of the rolled strip material.

[0007] This object is achieved by a rolling stand having the features of claim 1, a method having the features of claim 11 and a use having the features of claim 15.

[0008] The rolling stand according to the invention for rolling strip material comprises at least two roll stands, at least two work rolls, at least one base plate and a foundation, wherein the base plate is arranged between at least one of the roll stands and the foundation, wherein the base plate is made of ultra-high-strength concrete.

[0009] The rolling stand can have a number of further rolls on the at least two work rolls, which are mounted at their respective ends on roll stands. The roll stands are in turn connected to the base plate or mounted thereon, whereby the base plate can be designed in the form of a cross member that can connect both roll stands running in the longitudinal direction of the work rolls. However, it can also be provided that each roll stand has its own separate base plate for each inlet side and outlet side of the rolling stand, whereby the base plates are then not directly connected to one another. Consequently, the rolling stand can also have a plurality of base plates, each of which is individually arranged on roll stands or is designed as cross members connecting roll stands.In the following, reference is always made to a base plate, regardless of the design of the rolling stand with one or more base plates.

[0010] According to the invention, the base plate is made of ultra-high-strength concrete, whereby ultra-high-strength concrete can also be understood as ultra-high-performance concrete. The base plate is formed integrally from the ultra-high-strength concrete. Advantageously, ultra-high-strength concrete, in addition to its high strength, also has particularly good damping properties against vibrations and advantageous thermal inertia in the event of thermal fluctuations. In contrast to casting metal, casting ultra-high-strength concrete requires significantly less energy. Furthermore, a casting mold is much easier to manufacture. The base plate can therefore be manufactured easily and cost-effectively with comparatively little technical effort, without the need for a metal foundry.Machining of the base plate after casting is also not required, or only to a relatively limited extent. Furthermore, the possibility of manufacturing the base plate in situ is opened up, eliminating the need for complex transport. Furthermore, the required metal parts, which can be manufactured cost-effectively and quickly on relatively small machines, can be easily positioned and cast into the mold.

[0011] The rolling stand can be designed with a single base plate for both roll stands, with separate base plates designed as cross beams for each roll stand on an inlet side and on an outlet side of the rolling stand, or with four or more separate base plates designed as blocks for the roll stands. Thus, at least two or more base plates or blocks can be arranged beneath one of the roll stands. In principle, any configuration of a plurality of base plates and roll stands is conceivable. Conventional base plates can also be used together with base plates according to the invention.

[0012] The ultra-high-performance concrete can have a compressive strength of > 125, preferably > 150 N / mm 2and a water-cement ratio (w / c ratio) of < 0.4, preferably from 0.2 to 0.3. To achieve these properties, a binder mixture of Portland cement, granulated blast furnace slag, or fly ash can be used, for example. In particular, the addition of materials with a significantly smaller grain diameter than cement fills the spaces between cement grains, leading to structural densification. Due to the low water-cement ratio, or water content, the distance between cement grains is further minimized.

[0013] The ultra-high-performance concrete can contain a proportion of fibers, preferably steel fibers, polymer fibers, glass fibers, and / or carbon fibers. This can further increase the compressive strength of the ultra-high-performance concrete. The fiber content can also prevent any cracking that may occur during production or at a later date. The addition of fibers also increases the elasticity of the ultra-high-performance concrete. Furthermore, it can enable improved, more dimensional and shape-accurate production of the base plate.

[0014] The base plate can be formed with a base and a shaft extending therefrom, wherein at least one rib can be formed between the shaft and the base. The shaft can be formed in the manner of a cuboid, square, or rectangle, wherein the base can be formed at a base of the base plate in the manner of a projection such that the base plate can form a large bearing surface at the base. The base can be formed on two opposite side surfaces of the shaft or on all side surfaces of the shaft. Starting from the base, one or a plurality of stiffening ribs can be formed on at least one side surface of the shaft, which ribs extend vertically from the base. A force of the roller stand acting on the base plate is then transferred to the base via the rib. The base plate can thus be designed with a lower weight overall.

[0015] The base plate can have a plurality of adjustment devices made of a metal material on a base of the base plate, which can be designed to align a support surface of the roll stand formed on the base plate in a horizontal plane. The base here is understood to be an underside or a base of the base plate, which is arranged on the foundation. The plurality of adjustment devices can be, for example, 2, 3 or 4 adjustment devices, which can each be arranged at a relative distance from one another on the base. Accordingly, the base plate with adjustment devices can be arranged pointwise on the foundation or rest on it. The metal material of the adjustment devices can be iron, steel or the like.The adjustment devices can be designed such that the support surface formed on an upper side of the base plate can be aligned in the desired position or height and in accordance with the horizontal plane by means of the adjustment devices. The support surface can then be completely horizontal and level, so that the roller stand can also be mounted on the base plate in the desired position and orientation. By using the adjustment devices, it is possible to achieve the desired alignment of the base plate without having to lift the base plate with a crane or other lifting equipment for supporting plates or the like.

[0016] The adjustment devices can each be formed by a threaded bushing with a threaded piece whose height can be adjusted therein. An internal thread of the threaded bushing and a matching external thread of the threaded piece can be a fine thread, which, when the threaded piece is rotated relative to the threaded bushing, enables movement and thus adjustment of the base plate in a vertical direction. The adjustment devices are then arranged on the base plate such that a longitudinal axis of the threaded bushing runs in a vertical direction. The threaded piece can also be designed as a bushing, for example. A key receptacle for a tool for rotating the threaded piece can be formed on the threaded piece.

[0017] The base plate can have a support element made of a metal material at an upper end of the base plate, wherein the support element can form a support surface of the roll stand. The metal material of the support element can be steel, cast steel, or cast iron. The upper end of the base plate can be designed in the manner of a capital, wherein the support element can form the upper end at least partially, preferably completely. This can ensure that the base plate is not damaged during assembly of the roll stand. Furthermore, the load exerted by the roll stand can be evenly distributed over the molded body, thus increasing the load-bearing capacity of the base plate. Furthermore, advantageous assembly options for the roll stand on the support element result if the support element is made of a metal material.In a particularly simple embodiment, the support element can be designed as a flat plate, the upper side of which forms the support surface and the underside of which can be firmly connected to the ultra-high-strength concrete.

[0018] The support element and / or the adjustment devices can be at least partially cast in the ultra-high-performance concrete. Thus, during manufacture of the base plate, the support element and / or the adjustment devices can be inserted into a mold of the base plate before the mold is filled with the still-liquid ultra-high-performance concrete. The support element and / or the adjustment devices can thus be connected to the ultra-high-performance concrete and positioned on the base plate particularly easily and precisely. In particular, recesses and / or projections can be formed on the support element and / or the adjustment devices, enabling positive-locking fixation of the support element and / or the adjustment devices in the ultra-high-performance concrete surrounding the support element and / or the adjustment devices at the relevant location.At least partially encapsulating the adjustment devices in the ultra-high-strength concrete allows for particularly simple design and installation of the adjustment devices. In comparison, constructing such adjustment devices from a base plate made entirely of metal would be hardly cost-effective due to the required machine tools for machining.

[0019] The roll stand can be firmly connected to the base plate by means of at least one tensioning anchor of a tensioning device of the roll stand, wherein the base plate can be designed with at least one vertical through-opening through which the tensioning anchor can be guided, wherein the base plate can be pre-tensioned with a force. The through-opening can in principle be designed with any desired cross-section. The tensioning anchor can then be fastened to the roll stand and guided through the through-opening, wherein the tensioning anchor engages behind the through-opening at a lower end of the through-opening or at another point. It is then possible to pre-tension the tensioning anchor with a force starting from an upper side of the base plate so that the roll stand is fixed to the base plate in a force-fitting and positive-locking manner.Advantageously, the base plate can then be prestressed with the force in the vertical direction, creating compressive stress in the ultra-high-strength concrete. This counteracts any cracking caused by any tensile stress that may occur. This also allows the damping of unwanted vibrations to be influenced via the base plate.

[0020] In the method according to the invention for producing a rolling stand for rolling strip material with at least two work rolls, a foundation is arranged in a substructure, with at least one base plate being arranged on the foundation, with at least one roll stand being arranged on the base plate of at least two roll stands of the rolling stand, the base plate being formed from ultra-high-strength concrete. For the advantages of the method according to the invention, reference is made to the description of the advantages of the rolling stand according to the invention.

[0021] The base plate can be formed by pouring ultra-high-performance concrete into a mold or casting mould, wherein at least one metallic support element and / or at least one adjustment device can be inserted into the mould prior to pouring. A casting compound of the ultra-high-performance concrete can then at least partially surround the support element and / or the adjustment devices and thus firmly fix them within the base plate. The base plate can be shaped like a formwork and be reusable. After the hardened ultra-high-performance concrete has been removed from the formwork, the base plate is obtained and can then be ready for use without further machining. Furthermore, the mould can be designed as a sheet metal construction, which can then be filled with ultra-high-performance concrete as a lost mould. This can also simplify the in-situ production of the base plate.

[0022] The base plate can be aligned in a horizontal plane relative to the foundation according to a support surface formed on the base plate for the roller stand, whereby an air gap can be formed between the base plate and the foundation, which air gap can be filled with a hardenable casting compound. The air gap can be created by aligning or positioning the base plate on the foundation in a vertical direction. By filling the air gap with the casting compound, the base plate is firmly connected to the foundation so that the base plate can then rest completely on the foundation. Any possible movement of the base plate relative to the foundation is then largely excluded.

[0023] The roller stand can be fixed to the base plate using a clamping device, both force-fitting and form-fitting. The clamping device can be implemented using one or more tensioning anchors or clamping screws. The roller stand is preferably fixed to the base plate when the base plate is correctly positioned on the foundation, secured, and the air gap between the base of the base plate and the foundation is filled with the grout, which has set. A surface transfer of the applied load between the base plate and the grout increases the load-bearing capacity of this arrangement.

[0024] Further advantageous embodiments of the method emerge from the respective feature descriptions of the subclaims referring back to device claim 1.

[0025] In the inventive use of ultra-high-strength concrete to form at least one base plate of a rolling stand for rolling strip material, the rolling stand is designed with at least two roll stands, at least two work rolls, and a foundation, wherein the base plate is arranged between at least one of the roll stands and the foundation. For the advantages resulting from the inventive use of ultra-high-strength concrete, reference is made to the description of the advantages of the rolling stand according to the invention. Further advantageous embodiments of the use emerge from the respective feature descriptions of the subclaims referring back to device claim 1.

[0026] The invention is explained in more detail below with reference to the accompanying drawings.

[0027] It shows

[0028] Fig. 1 is a perspective view of a base plate;

[0029] Fig. 2 is a longitudinal sectional view of the base plate of Fig. 1.

[0030] 1 and 2 together shows a base plate 10 of a rolling stand, only partially shown here, comprising at least two roll housings 11, at least two work rolls and a foundation 12 in a subsurface not shown here. The base plate 10 is made of ultra-high-strength concrete 13 which contains a proportion of fibers. The base plate 10 is formed with a base 14 and a shaft 15 rising therefrom. Between the shaft 15 and the base 14, a rib 17 is formed on opposite side surfaces 16 of the shaft 15. By pouring the ultra-high-strength concrete or a corresponding casting compound into a mold not shown here, the base 14, the shaft 15 and the ribs 17 are formed into a one-piece molded body 18 of the base plate 10.

[0031] Four adjustment devices 19 are attached to the base 14 of the base plate 10. The adjustment devices 19 protrude from an underside or base 20 of the base plate 10 and were inserted into the mold before casting. The adjustment devices 19 are formed by a threaded bushing 21 and a threaded piece 22. The threaded piece 22 is rotatable in the threaded bushing 21 by means of a fine thread (not shown in detail here) and is thus movable along a longitudinal axis 23 of the adjustment devices 19. The threaded pieces 22 each rest on a surface 24 of the foundation 12 and, with each rotation of the threaded pieces 22, allow a height adjustment of a support surface 25 of the base plate 10 and its alignment in a horizontal plane 26. After the base plate 10 has been correctly positioned, an air gap 27 between the base 20 and the surface 24 is completely filled by means of a curable casting compound 33.

[0032] The base plate 10 further includes a support element 28 made of a metal material, which forms the support surface 25. The support element 28 was also inserted into the mold prior to casting. The support element 28 allows for damage-free alignment and assembly of the roller stand 11 on the base plate 10 or its support surface 25, as well as for a uniform distribution of compressive force on the shaft 15 of the base plate 10.

[0033] A through-opening 29 is formed within the base plate 10, through which a tension anchor 31 is passed for the force-fitting and form-fitting fastening of the roll stand 11 to the base plate 10 with the foundation 12. An undercut 30 provided in the base 20 of the base plate 10 serves to accommodate a formwork tube 34, through which the tension anchor 31 is fastened to the foundation 12. By immersing the formwork tube 34 into the undercut 30, the casting compound 33 is prevented from flowing into the formwork tube 34, reaching the tension anchor 31 and preventing the desired expansion of the tension anchor 31 during a force-fitting fastening of the roll stand 11.

[0034] It is then also possible to prestress the base plate 10 and thus the ultra-high-strength concrete 13 by means of the stressing anchor 31.

Claims

Patent claims 1. Roll stand for rolling strip material, with at least two roll stands (11), at least two work rolls, at least one base plate (10) and a foundation (12), wherein the base plate is arranged between at least one of the roll stands and the foundation, characterized in that the base plate is made of ultra-high-strength concrete (13).

2. Roll stand according to claim 1, characterized in that the roll stand is designed with a single base plate for both roll stands (11), with separate base plates designed as cross members for each roll stand on an inlet side and on an outlet side of the roll stand, or with four separate base plates designed as blocks for the roll stands.

3. Rolling stand according to claim 1 or 2, characterized in that that the ultra-high-performance concrete (13) has a compressive strength of > 125, preferably > 150 N / mm 2 and a water-cement ratio (w / c ratio) of < 0.4, preferably from 0.2 to 0.

3.

4. Rolling stand according to one of the preceding claims, characterized in that the ultra-high-strength concrete (13) has a proportion of fibers, preferably steel fibers, polymer fibers, glass fibers and / or carbon fibers.

5. Rolling stand according to one of the preceding claims, characterized in that the base plate (10) is formed with a base (14) and a shaft (15) extending therefrom, wherein at least one rib (17) is formed between the shaft and the base.

6. Roll stand according to one of the preceding claims, characterized in that the base plate (10) has a plurality of adjusting devices (19) made of a metal material on a base (20) of the base plate, which is designed to align a support surface (25) of the roll stand (11) formed on the base plate in a horizontal plane (26).

7. Roll stand according to claim 6, characterized in that the adjusting devices (19) are each formed by a threaded bushing (21) with a threaded piece (22) adjustable in height therein.

8. Roll stand according to claim 6 or 7, characterized in that the base plate (10) has a support element (28) made of a metal material at an upper end of the base plate, wherein the support element forms a support surface (25) of the roll stand.

9. Rolling stand according to one of claims 6 to 8, characterized in that the support element (28) and / or the adjusting devices (19) are at least partially cast in the ultra-high-strength concrete (13).

10. Roll stand according to one of the preceding claims, characterized in that the roll stand is firmly connected to the base plate (10) by means of at least one tensioning anchor (31) of a tensioning device (32) of the roll stand, wherein the base plate is formed with a vertical through-opening (29) through which the tensioning anchor is guided, wherein the base plate is pre-tensioned with a force.

11. Method for producing a rolling stand for rolling strip-shaped material with at least two work rolls, wherein a foundation (12) is arranged in a substructure, wherein at least one base plate (10) is arranged on the foundation, wherein at least one roll stand is arranged on the base plate of at least two roll stands (11) of the rolling stand, characterized in that the base plate is formed from ultra-high-strength concrete (13).

12. Method according to claim 11, characterized in that the base plate (10) is formed by casting ultra-high-strength concrete (13) is formed into a mold, wherein at least one metallic support element (28) and / or at least one adjusting device (19) is inserted into the mold.

13. Method according to one of claims 11 or 12, characterized in that the base plate (10) is aligned relative to the foundation (12) in a horizontal plane (26) according to a support surface (25) formed on the base plate for the roller stand (11), wherein an air gap (27) is formed between the base plate and the foundation, wherein the air gap is filled with a curable casting compound (33).

14. Method according to claim 11 to 13, characterized in that the roller stand (11) is fixed to the base plate (10) in a force-fitting and form-fitting manner by means of a clamping device (32).

15. Use of ultra-high-strength concrete (13) for forming at least one base plate (10) of a rolling stand for rolling strip material, wherein the rolling stand is formed with at least two roll stands (11), at least two work rolls and a foundation (12), wherein the base plate is arranged between at least one of the roll stands and the foundation.

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