Three-fold rotationally symmetrical rolling stand with rollers mounted in eccentric bushings

Abstract

The present application relates to a rolling stand (1) for rolling metallic bars, wires or tubes along a rolling axis (19), comprising a stand housing (10) whose outer surface, viewed along the rolling axis, has at least six side surfaces (14.1-14.6) of equal length arranged rotationally symmetrically around the rolling axis, wherein two side surfaces (14.1, 14.4, 14.2, 14.5, 14.3, 14.6) form a pair of side surfaces (14.1-14.6) lying parallel to each other, and three rolls (20.1-20.3) mounted on a roll shaft, surrounding the rolling axis (19) in a star shape, which together form a caliber (21). The three roller shafts are mounted in bearing bores of the frame housing (10) by means of eccentric bushings so that a radial distance of the rollers (20.1-20.3) to the roller axis (19) is adjustable.

Description

TECHNICAL AREA

[0001] The present invention relates to a rolling stand for rolling metallic bars, wires or tubes along a rolling axis, comprising a stand housing and three rollers, each mounted on a roller shaft and surrounding the rolling axis in a star shape, which together form a caliber, wherein the three roller shafts are mounted in bearing bores of the stand housing by means of eccentric bushings in such a way that a radial distance of the rollers to the rolling axis is adjustable. BACKGROUND

[0002] Rolling stands for rolling bar-shaped material with three or more rolls are commonly used in the production of metal tubes, bars, or wires. The material can be rolled to the desired diameter by adjusting the die size accordingly. To adjust the die size of a rolling stand, it is common practice to change the distance of the rolls from the rolling axis. One technical solution for adjusting the roll positions relative to the rolling axis is the eccentric adjustment.

[0003] For example, a rolling mill stand in the above-mentioned technical field with an eccentric adjustment mechanism is known from DE 100 15 340 A1. In the rolling mill stand described therein, the rolls are each mounted on a roll shaft, which is rotatably supported in two eccentric bushings via rolling bearings. By rotating the eccentric bushings, the rolls can be adjusted radially with respect to the rolling axis, so that the caliber of the rolling mill stand can be continuously adjusted and rolled material of different diameters can be produced. In DE 100 15 340 A1, synchronous adjustment of all roll shafts, and thus of all rolls, is made possible by driving only one eccentric bushing, which is achieved via an adjustment connection provided on a side surface of the stand housing.

[0004] Typically, several rolling stands are arranged sequentially within a rolling mill. This allows the material to be stretched and rolled to a smaller diameter, particularly through a difference in the rolling speeds of the individual stands.

[0005] Furthermore, the roundness of the rolled material after passing through a rolling stand is generally insufficient, as the cross-section assumes a polygon-like shape due to the star-shaped arrangement of the rolls and their relatively small number, with the number of sides of the polygon corresponding to the number of rolls in the rolling stand. For example, rolled material processed by a single three-roll rolling stand has a cross-sectional shape that is not ideally round, but approximately triangular.

[0006] To improve the roundness of the rolled material, the successive rolling stands are preferably arranged in such a way that the corners of the rolled material cross-section of the rolled material leaving one rolling stand are centrally contacted by the rollers of the following rolling stand, and the rolled material cross-section is thereby rounded.

[0007] Typically, the three rolls of, for example, the first and third rolling stands of a rolling mill with four rolling stands are arranged in a so-called "Y-arrangement", and the rolls of the respective stands behind them, for example the second and fourth rolling stands, are arranged in a so-called "anti-Y-arrangement" ( ). By alternating the arrangement of the rollers and rolling stands in Y-arrangement and anti-Y-arrangement, the corners of the rolled material cross-section are rolled by a roller in the following rolling stand, thus rounding off the rolled material cross-section.

[0008] In the Y-arrangement, the lower roll is oriented so that its roll shaft is horizontal, meaning that the diameter of the lower roll extends vertically in the direction of the roll axis. In contrast, in the anti-Y arrangement, it is the upper roll whose roll shaft is horizontal, meaning that the diameter of the upper roll extends vertically in the direction of the roll axis. The roll shafts of the two other rolls are tilted by 120° relative to the horizontal roll shaft in both cases. Of course, the arrangements relative to the horizontal are arbitrary overall, because for the effect described here, only the relative arrangement of the rolls with respect to adjacent rolling stands is relevant.

[0009] The arrangement of rolling stands in a row to form a roll block is usually achieved using stand supports into which the stands are inserted and held. This makes it possible to replace rolling stands within the roll block, for example, for regularly required maintenance.

[0010] The rolling stand known from DE 100 15 340 A1 allows it to be switched between the Y-arrangement and anti-Y-arrangement by rotating it 180° around a horizontal axis and to be inserted into the stand mount in both orientations. The upper and lower side surfaces of the rectangular stand housing serve as bearing surfaces in the stand mount.

[0011] The rolling stand positions for the Y-arrangement and the anti-Y-arrangement can be selected such that the adjustment connection for the eccentric adjustment, provided on one side face of the stand housing, remains on the same side if the side face is a horizontally bounding side of the stand, i.e., vertically oriented. On the opposite side face, there is then a coupling for transmitting power to a drive train with a motor and, if required, a gearbox for driving the roll with a horizontally oriented roll shaft.

[0012] While the previously described arrangement of the positioning connection allows good accessibility for manual operation of the positioning connection from this side, the positioning connection cannot easily be operated and actuated automatically, i.e. by so-called remote positioning, because a motor required for this purpose must not be provided on this side in order not to obstruct access to the rolling stand. PRESENTATION OF THE INVENTION

[0013] Against this background, one object of the present invention is to provide a rolling stand of the above technical field which allows for more flexible use within a rolling block and, in particular, a more flexible selection of both a position in the rolling block and an adjustment configuration, while maintaining a compact design of the rolling block.

[0014] In other words, the task is to further develop a rolling stand of the above technical field in such a way that it can be arranged modularly and in as many different ways as possible in a rolling block, at different positions and in different orientations in a stand mount, so that the radial distance of the rolls to the rolling axis, i.e. the pitch, can be adjusted in several different ways in different pitch configurations.

[0015] This problem is solved by a rolling mill stand according to claim 1. Advantageous embodiments of the invention are described in the dependent claims.

[0016] The rolling stand for rolling metallic bars, wires or tubes along a rolling axis comprises a stand housing, the outside of which, viewed along the rolling axis, has at least six side surfaces of equal length arranged rotationally symmetrically around the rolling axis, wherein two side surfaces form a pair of parallel side surfaces, and three rolls, each mounted on a roll shaft and surrounding the rolling axis in a star shape, which together form a caliber, wherein the three roll shafts are mounted in bearing bores of the stand housing by means of eccentric bushings in such a way that a radial distance of the rolls to the rolling axis is adjustable.

[0017] In this context, the side surfaces are those surfaces of the stand housing that laterally define the front surface and the rear surface through which the rolling axis passes. Together, viewed along the rolling axis, they form the lateral outer surface of the stand housing. Because the side surfaces are arranged in pairs parallel to each other and rotationally symmetrical around the rolling axis, the projection of the stand housing along the rolling axis can define a polygon with at least six sides and vertices.

[0018] The side surfaces of the stand housing can serve as a base, have a base, or run parallel to a base or several bases, for example, formed by sliding rails, on which the rolling stand can stand stably, particularly in a stand support. The side surfaces do not have to be flat, but can also have steps, projections, recesses, or openings, and can also be made up of multiple parts.

[0019] In this context, "side surfaces of equal length" means that they have the same length in the circumferential direction. It is also possible that adjacent side surfaces do not have sharp corners, but rather curves, extended chamfers, or similar features.

[0020] The fact that the rolls are each mounted on a roll shaft also refers, for example, to a roll that is axially clamped between two sections of an axially divided roll shaft. In particular, the roll is fixed to the roll shaft, for example, by frictional engagement, meaning it is not supported by a bearing on the roll shaft. This also implies that the rolls can be driven via their roll shafts. For this purpose, each roll shaft can have its own drive connection at an end protruding outside the rolling stand. A suitable coupling allows a motor to apply a torque to each roll shaft and thus to the corresponding roll. It is also possible for several roll shafts to be coupled to each other via a gearbox outside the rolling stand and driven by a common motor.Since the rolling forces acting in a rolling stand of this technical field amount to several kilotons, the rolling motors must be powerful and therefore large. The rolling motors and their peripherals should not obstruct access to the roll block and rolling stand, so as not to hinder the regular replacement of the rolling stands for maintenance purposes.

[0021] It is therefore important for the entire rolling mill that the drive connections of the roll shafts are located at a specific position in the rolling mill, in the same place and in the same orientation, so that a replaced rolling stand can be connected to the drive of the rolls as quickly and safely as possible, and that these locations and orientations do not obstruct access to the rolling mill, especially to the rolling stands, as much as possible.

[0022] The star-shaped arrangement of the rolls around the rolling axis means that the rolls, or rather their planes of rotation, are each arranged at an angle of 120° to the two adjacent rolls, or rather their planes of rotation. This also applies to the roll shafts, whose axes, unlike the rolls' planes of rotation, do not intersect at the same diameter. However, each roll shaft is positioned at an angle of 120° to the other two roll shafts within the rolling stand.

[0023] In this context, the caliber refers to the opening between the three rolls through which the workpiece is fed and rolled. It extends across the cross-sectional area orthogonally to the rolling axis of the passage, which is formed within the rolling surfaces by the star-shaped arrangement of the three rolls. The caliber is not identical to a nominal or production diameter of the workpiece because the rolling stand expands due to the workpiece and is elastically deformed during the rolling process. Furthermore, the workpiece's diameter is influenced not only by the rolls themselves, but also, for example, by forces between adjacent rolling stands, both elastically and plastically. However, the caliber significantly influences the production diameter.

[0024] In the present rolling stand, the distances of the rolls to the rolling axis for setting the caliber can be adjusted by rotating the eccentric bushings, i.e. an eccentric adjustment as known, for example, from DE 100 15 340 A1.

[0025] The number and arrangement of the side surfaces of the present rolling stand offer an advantage over a rectangular stand housing with four side surfaces, as known from the prior art, in that the rolling stand can be used modularly in various positions within the roll block and in different configurations with regard to the adjustability of the radial distance of the rolls to the roll axis. This reduces the number of rolling stands required by a roll block operator, because the same rolling stand can be used universally throughout the entire roll block, even after the roll block has been reconfigured with regard to the adjustability of the radial distance of the rolls to the roll axis.Thus, the invention enables more flexible use within a rolling block and, in particular, a more flexible selection of both a position in the rolling block and an adjustment configuration, while simultaneously achieving a compact design of the rolling block.

[0026] The invention also enables the flexible attachment of additional components arranged on or in the frame housing. Besides a connection for an eccentric adjustment, such components can include, for example, operating connections, guides such as hopper guides or roller guides (as inlet or outlet guides), sliding elements, bearing elements, and fastening elements. In this respect as well, the present invention allows for a high degree of modularization of the rolling block.

[0027] Limiting the complexity of the roll arrangement is advantageous because it simplifies the arrangement of drive devices for the roll shafts within the rolling block. In particular, three different roll stand arrangements result, each with three identical angles of rotation for the roll shafts when viewed along the rolling axis. When using essentially identical rolls and roll shafts that can be driven by any of the provided drive devices, it is therefore only necessary to provide, for example, translational offsets for the drive devices or gear and coupling components that can compensate for the translational misalignment of the roll shafts. This reduces the complexity and design effort of the rolling block.

[0028] Preferably, at least one further side surface is oriented at an angle of 120° to each of the side surfaces viewed from the rolling axis. This angle is to be understood as an interior angle, i.e., the respective side surfaces define a corner of the frame housing spanning a total of 120°. To move from a direction along one side surface to the direction along the other side surface, a change of direction of 60° in the circumferential direction is required.This makes it possible to stably position the rolling stand in at least six different positions, each tilted 60° to one another, on or parallel to one of the side surfaces. The preferred angle between the side surfaces, in conjunction with the fact that the rolling stand comprises exactly three rolls, leads to the particularly advantageous effect that the orientations of the rolls can always be switched between Y-orientation and anti-Y-orientation, or corresponding, mutually compensating orientations. This serves to achieve a particularly high quality of the rolled product with regard to its roundness.

[0029] This offers the advantage that the stand housing, with its identical stand mounting geometry, can be mounted and used in a particularly large number of usable positions. The rolling stand can thus be flexibly arranged and used in a stand mounting that is the same for all rolling stands. At the same time, this ensures a high quality of the rolled material.

[0030] Preferably, each of the three roller shafts runs parallel to one of the pairs of parallel side surfaces. In other words, each roller has a plane of rotation that is arranged orthogonally to a pair of side surfaces. Preferably, the plane of rotation orthogonal to the pair of side surfaces is located midway along the circumference of the side surfaces, forming a perpendicular bisector.

[0031] This preferred feature further contributes to improved flexibility and modularity of the rolling stand in the roll block. The rolling stand designed in this way allows for a particularly space-saving and stable arrangement of at least one of the motors for the roll drive by means of a horizontal drive shaft when the rolling stand stands on or parallel to one of its side faces.

[0032] In an exemplary stand mounting which supports the rolling stand according to the invention such that a pair of side surfaces is horizontally aligned, there are therefore basically six different arrangements of the rolling stand possible, in which the rolls are either in a Y-arrangement or in an anti-Y-arrangement and wherein a roll has a horizontal roll shaft, i.e. a vertical plane of rotation.

[0033] Preferably, the outer surface of the stand housing has exactly six sides forming a regular hexagon. This particularly preferred design of the stand housing allows for exceptional flexibility in its use. The symmetry of the stand housing resulting from the regular hexagonal shape is particularly well suited to the star-shaped arrangement of the three rolls and roll shafts. This allows the three rolls and roll shafts to be arranged symmetrically within the stand housing, enabling the rolling stand to fit into the stand mount in several different orientations and allowing the rolls to be coupled to the rolling block motors in each of these orientations.

[0034] Preferably, the rolling stand further comprises an adjustment port for applying an adjustment torque to alter the radial position of the roll shafts relative to the rolling axis for setting the barrel size. At least two adjustment configurations are possible, i.e., both remote adjustment via an external motor and manual adjustment. For this, the external motor or a suitable tool, such as a wrench, must engage with the adjustment port to actuate it, i.e., to rotate it. The rotary motion can be transmitted, for example, via a gearbox to one of the eccentric bushings of the rolling stand. From this eccentric bushing, the rotary motion can be transmitted in a generally known manner to other eccentric bushings of the roll shafts. In this way, all roll shafts can be adjusted synchronously via a single adjustment port, and the barrel size can be set accordingly.

[0035] Preferably, the adjustment port is located on the outside, i.e., on the side, of the stand housing in a corner of the regular hexagon. "In a corner of the regular hexagon" in this context means that the adjustment port is located closer to a corner, i.e., at a transition between two adjacent side faces, than to the center of a side face. This arrangement of the adjustment port allows for more flexible use of the rolling stand. The rolling stand can thus be rotated 180° about an axis passing through the corner and the rolling axis, and thereby switched between the Y-arrangement and the anti-Y-arrangement, without significantly changing the position of the adjustment port.

[0036] Thus, there are several positions of the rolling stand in which it can be inserted into a stand support, with the orientation of the drive couplings of the roll shafts remaining the same in all these positions, and the position of the drive couplings of the roll shafts being only slightly offset. This allows for flexible switching between different adjustment configurations, for example, a position of the rolling stand in which the adjustment connection is easily accessible from the front for manual operation, and one or more other positions in which, for example, an external motor can engage with the adjustment connection without blocking or obstructing access from the front.

[0037] Preferably, the adjustment connection can be operated both manually and automatically via an external motor. In this context, "manually operated" means that the adjustment connection can be operated by hand by an operator using a suitable tool. "Operated via an external motor," on the other hand, means that the adjustment connection can be operated, i.e., rotated, without manual operation or the use of a tool, for example, by a suitable coupling connected to a motor. This means that the adjustment connection must be arranged and designed in such a way that it is compatible with both configurations of a roll adjustment drive. Thus, the rolling stand can be used directly in both configurations without having to reconfigure the adjustment connection for either configuration—i.e., manual adjustment or automatic adjustment by a motor.However, it is also possible that the adjustment port is designed for either automatic or manual adjustment only. In that case, this adjustment port would have to be reconfigured to change the adjustment configuration, which, while requiring more effort compared to the preferred embodiment, does not significantly impair the overall high flexibility of the rolling stand.

[0038] Preferably, the frame housing is closed and undivided, and in particular manufactured from a single monoblock. In other words, the frame housing is preferably integrally manufactured and can therefore be produced, for example, by a casting process, which enables advantageous mechanical properties for absorbing the loads acting during the rolling process and efficient manufacturing.

[0039] Preferably, each of the three roll shafts or rolls can be driven separately by its own dedicated motor. This allows, for example, the use of three relatively small motors, as they only need to provide one-third of the rolling torque. This makes it possible to design the motors smaller, which significantly reduces the overall size of the rolling block.

[0040] Preferably, each of the three roller shafts has a drive-side end for separate drive, which projects outwards from one of the side surfaces of the frame housing. In this way, the drive of the roller shafts can be ensured via the side surfaces, so that the corners of the frame housing are not occupied by the drive-side ends of the roller shafts.

[0041] Further advantages and developments of the invention will result from the following description of the figures and the entirety of the claims. SHORT FIGURE DESCRIPTION

[0042] Fig. 1A is a view along a rolling axis of a preferred rolling stand in an anti-Y arrangement in a first positioning configuration. Fig. 1B is a view along the rolling axis of the rolling stand from Fig. 1A in a Y-arrangement in the first deployment configuration. Fig. 1C is a view along the rolling axis of the rolling stand from Fig. 1A , in the anti-Y arrangement in a second employment configuration. Fig. 1D is a view along the rolling axis of the rolling stand from Fig. 1A , in the Y-arrangement in the second employment configuration. Fig. 2A is a perspective view of the rolling mill from Fig. 1A from a first perspective. Fig. 2B is another perspective view of the rolling mill from Fig. 1A from a second perspective. Fig. 3A is a side view of the rolling mill made of Fig. 1A , which shows an employment connection. Fig. 3B is another side view of the rolling mill Fig. 1A , which shows a side opposite the employment connection. WAYS TO IMPLEMENT THE INVENTION

[0043] In the following character descriptions, identical or corresponding elements are given the same reference symbols, and repetitive descriptions are largely avoided.

[0044] Fig. 1A Figure 1 shows a view along a rolling axis 19 extending in the Z direction of a preferred rolling stand 1 for rolling metallic bars, wires, or tubes. The rolling stand 1 comprises a stand housing 10, which, in the embodiment shown here, has the shape of a regular hexagon when viewed along the rolling axis 19. An outer surface 12 of the stand housing 10 is provided with six side surfaces 14.1-14.6 of equal length, which are arranged rotationally symmetrically around the rolling axis 19. Adjacent side surfaces 14.1-14.6 merge into one another in a region designated as a corner 16.1-16.6. The corners 16.1-16.6 may have different characteristics. They have a butt joint between the adjacent side surfaces 14.1-14.6 that merge into one another in the corner 16.1-16.6; this joint may be sharp-edged, but is preferably chamfered or rounded. Also a small intermediate area between adjacent side faces 14.1-14.A chamfer of 6, in the sense of a pronounced, relatively wide chamfer, is possible and is still understood in the present context as corner 16.1-16.6. One in . Fig. 1A Inlet side 15, which is not visible but is in Fig. 1B is depicted, and one in Fig. 1A The outlet side 13 of the frame housing 10 shown in the illustration thus has, like the frame housing 10 of the present embodiment, a regular hexagonal shape, which is distinguished, among other things, by having three pairs of side surfaces 14.1, 14.4, 14.2, 14.5, 14.3, 14.6, each of which lies parallel to the others. The frame housing 10 is manufactured as a monoblock.

[0045] The preferred rolling stand 1 is designed such that the in Fig. 1A unshown inlet page 15 of the in Fig. 1A The outlet side 13 shown is the same, so that all features described below for the outlet side 13 can be found on the opposite side of the frame housing 10 at the same or corresponding locations, as will also be shown below with reference to other figures.

[0046] The rolling stand 1 further comprises three rolls 20.1, 20.2, 20.3 arranged in a star shape around the rolling axis 19. The rolls 20.1-20.3 each define a plane of rotation that is at an angle of 120° to each other and intersects at the rolling axis 19. The planes of rotation of the rolls 20.1-20.3 are arranged orthogonally to each pair of side surfaces 14.1-14.6 of the stand housing 10. In the region of the rolling axis 19, the rolls 20.1-20.3 form a caliber 21 between them. The caliber 21 is enclosed, in particular, by a rolling surface 22 of each of the rolls 20.1-20.3, wherein the rolling surfaces 22 of the rolls 20.1-20.3 are formed as a concave groove centrally along the circumference of the respective roll 20.1-20.3 in order to give the rolled material as round an outer contour as possible. Depending on the rolled material, the rolling surface 22 can also be configured differently, in particular as a flat surface or as a convex surface. Fig. 1A It can be seen that the rollers 20.1-20.3 are arranged in an anti-Y arrangement because the upper roller 20.1 is vertical and the two remaining lower rollers 20.2, 20.3 are each at an angle of 120° to the vertical orientation of the upper roller 20.1.

[0047] The rollers 20.1-20.3 are each fixedly mounted on a roller shaft, via which the rollers 20.1-20.3 are driven. The axes of rotation of the roller shafts run parallel to each pair of side surfaces 14.1, 14.4, 14.2, 14.5, 14.3, 14.6. The axes of rotation are also transverse to the roller axis 19 and arranged rotationally symmetrically or in a star shape around it. The axis of rotation of the roller shaft of the in Fig. 1A The upper roller 20.1 is aligned in the X direction. The axes of rotation of the two other roller shafts are aligned at angles of 120° and 240° respectively with respect to the axis of rotation of the upper roller shaft. Of the roller shafts, in Fig. 1A Only one drive-side end 24.1, 24.2, 24.3 is shown, which protrudes outwards from one of the side surfaces 14.2, 14.4, 14.6 of the frame housing 10. This allows the roller shafts to be connected to an external drive, which can then transmit its rolling torque to the roller shafts and thus to the rollers 20.1-20.3 via a coupling.

[0048] The roller shafts run inside the frame housing 10, which also contains an eccentric adjustment (not shown) for positioning the rollers 20.1-20.3 via their roller shafts. The eccentric adjustment allows for the adjustment of the distance between the roller shafts, and thus the rollers 20.1-20.3, on the one hand, and the roller axis 19 on the other, in the XY plane. Fig. 1A The adjustment can be modified. This allows for the setting of different sizes of the caliber 21 and also compensates for wear on rollers 20.1-20.3 while maintaining a constant caliber 21. The eccentric adjustment forms an adjustment mechanism for rollers 20.1-20.3.

[0049] The adjustment mechanism of the rollers 20.1-20.3 can be operated externally by rotating an adjustment port 30 protruding outwards near corner 16.1. The adjustment port 30 is located in the Fig. 1A In the illustrated embodiment, the adjustment port 30 is designed to be both manually operable and automatically actuated by a motor. The adjustment port 30 is preferably connected to a rotatably mounted gear shaft extending into the interior of the frame housing 10 and to a bevel gear that engages in a toothed segment of an eccentric bushing of the eccentric adjustment mechanism. The eccentric bushing transmits a rotary motion transmitted to it via the bevel gear to the two other eccentric bushings, thus enabling synchronous adjustment of the rollers. The adjustment mechanism extends beyond the adjustment port 30 into Fig. 1A not shown in detail.

[0050] The adjustment port 30 is located near corner 16.1 and the transmission shaft connected to the adjustment port 30 runs parallel to the one in Fig. 1A upper roller shafts, i.e., in the X direction, whose drive-side end 24.1 protrudes from the frame housing 10 on the opposite side. The adjustment port 30 is thus located essentially opposite the drive-side end 24.1 of a roller shaft that runs parallel to the transmission shaft. This relative arrangement implies that the adjustment port 30 is not obscured by a roller motor aligned with the drive-side end 24.1 of one of the roller shafts, because the drive-side ends 24.2, 24.3 of the roller shafts adjacent to the adjustment port 30 are oriented at approximately 60° upwards and downwards with respect to the adjustment port 30 and its transmission shaft, so that the motors coupled to them form a large clearance between them, leaving the adjustment port 30 freely accessible.

[0051] The employment connection 30 is in Fig. 1A near corner 16.1 and slightly offset upwards with respect to an imaginary horizontal center plane of the frame housing 10. A distance between the adjustment connection 30 and the parallel to the transmission shaft, i.e. in Fig. 1A in the X-direction, running midplane along the Y-axis in Fig. 1A This is less than 10% of the extent of the scaffold housing 10 in the Y direction, i.e., between two opposite side surfaces 14.2, 14.5 of the scaffold housing 10.

[0052] In Fig. 1A Three mounting elements 26.1, 26.2, 26.3 are for a Fig. 1A The guide for the rolled material is not shown. The guide can be mounted on the exit side 13 of the stand housing 10, which is located in Fig. 1A shown. On inlet page 15, which is in Fig. 1A If it is not apparent, the mounting elements 26.1, 26.2, 26.3 can also be arranged so that a guide for the rolled material can be mounted there.

[0053] The guide for the rolled material can, for example, be a roller guide, in particular an inlet roller guide 60, as exemplified in Fig. 1B The assembly elements 26.1, 26.2, 26.3 are arranged in a star shape around the rolling axis 19 and are each, with respect to the rolling axis 19, opposite one of the rolls 20.1, 20.2, 20.3. The three assembly elements 26.1, 26.2, 26.3 are each arranged at an angular interval of 120° around the rolling axis 19.

[0054] Furthermore, on the in Fig. 1A On the outlet side 13 of the scaffold housing 10 shown, three coupling clamping areas 50.1, 50.2, 50.6 are arranged in adjacent corners 16.1, 16.2, 16.6 of the scaffold housing 10. The coupling clamping areas 50.1, 50.2, 50.6 are each bounded by two clamping strips 52. The three adjacent corners 16.1, 16.2, 16.6 in which the coupling clamping areas 50.1, 50.2, 50.6 are arranged are corner 16.1, in which the adjusting connection 30 is also arranged, and the two corners 16.2, 16.6 adjacent to it. The coupling clamping areas 50.1, 50.2, 50.6 serve to connect a roller guide adjusting connection 64, which is located in Fig. 1A not, but in Fig. 1B As shown, it is securely attached to the stand housing 10. This relative arrangement of the coupling clamping areas 50.1, 50.2, 50.6 in the corner 16.1 of the positioning connection 30 and the two surrounding corners 16.2, 16.6 allows the special flexibility of the arrangement and configuration of the rolling stand 1 with a roller guide to be combined and thus transferred to the overall system of rolling stand 1 and roller guide.

[0055] In Fig. 1A The figure shows that the scaffold housing 10 has four slide rails 40.2, 40.3, 40.4, 40.5 on the outlet side 13, which are arranged parallel to four adjacent side surfaces 14.2, 14.3, 14.4, 14.5. The slide rails 40.2-40.5 connect to one another and extend along the circumference of the hexagonal scaffold housing 10 from corner 16.2 with coupling clamping area 50.2 to corner 16.6 with coupling clamping area 50.6. The slide rails 40.2-40.5 are shown in the figure. Fig. 1A not on the side surfaces 14.2-14.5, but offset inwards in the direction of the rolling axis 19. The sliding strips 40.2-40.5 form sliding surfaces that extend circumferentially along the side surfaces 14.2-14.5 and outwards from the plane of the sheet parallel to the rolling axis 19 and the side surfaces 14.1-14.6, i.e. in Fig. 1A in the Z-direction. Thus, the sliding strips 40.2-40.5 can serve as a contact surface for the rolling stand 1 in four orientations and are primarily intended to facilitate the insertion of the rolling stand 1 into a stand receptacle (not shown) by allowing the rolling stand 1 to be slid into the receptacle on the sliding strips 40.2-40.5, which can also be used as sealing elements. On the in Fig. 1A On the opposite inlet side 15, not shown, there are also four sliding strips 40.2-40.5 opposite the sliding strips 40.2-40.5 shown, so that a pair of sliding strips 40.2-40.5 on opposite sides can be used for stable support of the rolling stand 1 in a stand mount.

[0056] The rolling stand 1 also has three water outlet openings 42.1, 42.2, 42.3 on the side shown in Fig. 1A shown outlet side 13. Cooling water, which is to be used, for example, for an inlet roller guide, can thus be discharged at one of the side surfaces 14.1, 14.3, 14.5 through in Fig. 1A Water is introduced into the scaffold housing 10 through the water inlet openings not shown, guided through the scaffold housing 10 and directed out through one of the water outlet openings 42.1, 42.2, 42.3 and from there fed to the roller guide.

[0057] In the corners 16.2, 16.3, 16.4, 16.5, 16.6 bounding the side surfaces 14, along which the sliding strips 40.2, 40.3, 40.4, 40.5 are arranged, there are also a total of five clamping points 44.2, 44.3, 44.4, 44.5, 44.6 on the Fig. 1A the outlet side 13 shown and the inlet side 15 not shown in this figure, through which a clamping force from the stand mount can be absorbed to fix the rolling stand 1.

[0058] Fig. 1B The rolling mill stand 1 shows Fig. 1A in a position opposite the orientation of Fig. 1A by tilting the rolling stand 1 about a horizontal axis K, i.e., running in the X-direction, by 180°. Thus, in Fig. 1B a view of the rear of the rolling mill stand 1 according to Fig. 1A , i.e., the inlet side 15, is shown. In this position of the rolling stand 1, the rolls 20.1-20.3 are, in contrast to the one shown in Fig. 1A The positions shown are arranged in a Y-arrangement.

[0059] The roller shafts are positioned relative to the position of the rolling stand 1. Fig. 1A The drive-side ends 24.1-24.3 are shifted parallel to each other, and therefore protrude from the stand housing 10 in the same direction, but at a different position, namely mirrored at the respective corners 16.2, 16.4, 16.6. The depicted rolling stand 1 thus allows, through the tilting described above, its use in the rolling block with both a Y-arrangement and an anti-Y-arrangement of the rolls 20.1-20.3 in the same stand mount, with the drive-side ends 24.1-24.3 of the roll shafts only shifting translationally. This enables a high degree of operational flexibility for the rolling stand 1 in a compact rolling block. The rolling drives, which are coupled to the drive-side ends 24.1-24.3 of the roll shafts in both positions of the rolling stand 1, can be arranged for each stand position with alternating Y-arrangement and anti-Y-arrangement on the same side of the rolling axis 19, which keeps the space requirement of the entire rolling block relatively small.

[0060] Due to the tilting about axis K, the adjustment port 30 remains located near corner 16.1 of the stand housing 10. It is positioned slightly downwards with respect to the horizontal center plane of the stand housing 10, namely mirrored at corner 16.1. Nevertheless, even in this position of the rolling stand 1, i.e., the Y-arrangement, the adjustment port 30 is easily accessible from the same side and is therefore particularly suitable for efficient manual operation of the eccentric adjustment of adjacent rolling stands 1.

[0061] In Fig. 1B Furthermore, an inlet roller guide 60 is shown, which is attached to the frame housing 10 via the mounting elements 26.1-26.3, which are described above with reference to Fig. 1A were described and also on the in Fig. 1B The inlet side 15 of the frame housing 10 is shown and is attached. The inlet roller guide 60 is also adjustable by positioning the rollers of the inlet roller guide 60 closer or further away from the rolling axis 19 by means of a roller adjustment mechanism. For the roller adjustment mechanism, the inlet roller guide 60 is connected via a drive shaft 62 to a roller adjustment connection 64, through which a rotational force can be applied to the roller adjustment mechanism.

[0062] The roller positioning connection 64 is attached to the coupling clamping area 50.1 and the associated clamping strips 52 on the rolling stand 1. The arrangement of the mounting elements 26.1-26.3 and the coupling clamping areas 50.1, 50.2, 50.6 on the stand housing 10 allows the roller guide 60 to be attached to the stand housing 10 securely, precisely, and quickly.

[0063] Furthermore, in Fig. 1B A water line 66 of the inlet roller guide 60 can be seen. The water line 66 is connected to the water outlet opening 42.3, through which cooling water for the guide rollers of the inlet roller guide 60 leaves the rolling stand 10, the cooling water passing through a Fig. 1B Water is supplied to the rolling stand 10 via the water inlet opening 43.3 (not shown) when it is received in the stand mount and connected to a water connection of the stand mount.

[0064] Fig. 1C shows the preferred rolling mill stand 1 made of Fig. 1A in a position from Fig. 1A rotated 120° clockwise around the rolling axis 19. Due to the geometry of the rolling stand 1, the rolls 20.1-20-3 are in the same anti-Y arrangement as in the Fig. 1A oriented in the position shown, and the three drive-side ends 24.1-24.3 also run in the same directions and are located in the same positions, so that they can be coupled to the external motors for applying the rolling torque in the same way as in the position shown. Fig. 1A However, the employment connection 30 is, in comparison to Fig. 1A arranged rotated 120° clockwise.

[0065] This arrangement preferably serves to implement remote adjustment of the adjustment mechanism of the rollers 20.1-20.3 by an external motor. The position of the adjustment port 30 in the Fig. 1C The position of the rolling stand 1 shown allows, on the one hand, an external actuating clutch of an external actuating motor in the stand mount (not shown) to engage with the actuating connection 30 and actuate it in order to actuate the rolls 20.1-20.3. This differs from the position shown in Fig. 1A und 1B Positions shown.

[0066] The rolling stand 1 must be able to be inserted into and removed from a stand mount transversely to the rolling axis 19 in order to allow for quick maintenance. This requirement in turn means that the rolling stand must be in Fig. 1A-1D It must be inserted to the right into the frame mount so that the vertically standing roller 20.1 is in Fig. 1A und 1B or 20.2 in Fig. 1C und 1D The driving roller motor can engage with the respective drive-side end 24.1 or 24.2 because the roller motor for the roller 20.1 is located to the right of the roller axis 19. Fig. 1A und 1B or 20.2 in Fig. 1C und 1D is arranged to the right of the rolling axis 19 in order to be coupled to the drive-side end 24.1 or 24.2.

[0067] This in turn means that in Fig. 1A-1D No external adjusting motor may be located to the left of the rolling axis 19 and thus also to the rolling stand 1, i.e., in the insertion direction in front of the rolling axis 19. The positions from Fig. 1A und 1B are therefore configured for manual activation, i.e., operation of the activation port 30 by a person, and activation port 30 cannot be activated by automatic remote activation in this configuration, or only with disproportionate effort. The positions from Fig. 1C und 1D , in which the adjustment port is located behind the rolling axis 19 in the insertion direction, are configured for remote adjustment, i.e., actuation of the adjustment port 30 by an external motor.

[0068] In the Fig. 1C In the position shown, the rolling stand 1 rests on the sliding rails 40.4, while the roll 20.2 is the roll with a vertical plane of rotation, and the coupling clamping area 50.6 lies in a horizontal direction next to the rolling axis 19.

[0069] Fig. 1D shows the preferred rolling mill in the configuration from Fig. 1C , i.e., the configuration for remote positioning with positioning port 30 to the upper right. The position of the rolling stand 1 in Fig. 1D can be compared to those in Fig. 1C by tilting the rolling stand 1 about the axis K, which is inclined by 120° and thus also by 60° to the horizontal X-direction and runs through corners 16.1 and 16.4, by 180°. Analogous to the transition between the position of the rolling stand 1 from Fig. 1A and those from Fig. 1B This also occurs during the transition between the position of the rolling stand 1. Fig. 1C and those from Fig. 1D tilted 180° about axis K, which runs essentially parallel to the gear shaft of the adjustment connection 30. This tilting action does not change the orientation of the adjustment connection 30, and the rollers 20.1-20.3 exit the position described above. Fig. 1C shown anti-Y arrangement in the Fig. 1D The Y-arrangement shown and vice versa.

[0070] In Fig. 1D is like in Fig. 1B The inlet side 15 of the rolling stand 1 is shown. As also in Fig. 1B is an inlet roller guide 60 together with drive shaft 62 and roller adjustment connection 64 attached to the frame housing 10 via the mounting elements 26.1, 26.2, 26.3 and the coupling clamping area 50.2 with clamping strips 52.

[0071] In the Fig. 1D In the position shown, the rolling stand 1 rests on the sliding rails 40.3, while the roll 20.3 is the roll with a vertical plane of rotation, and the coupling clamping area 50.2 lies in a horizontal direction next to the rolling axis 19.

[0072] Due to the hexagonal shape of the stand housing 10, the rolling stand 1 can be positioned in the four in the Fig. 1A-1D The positions shown are all compatible with similar arrangements of the rolling motors in the rolling block with stand mounts. This allows for both Y-arrangements and anti-Y-arrangements of the rolls, and equally in two different configurations in terms of different orientations and arrangements of the adjustment connection 30: one for manual adjustment and one for remote adjustment. This flexibility is not achieved with the known rectangular stand housings because these can only be securely positioned and moved on or along one of the side surfaces of the stand housing, which dictates the orientation of the adjustment connection while maintaining the same orientation of the rolling motors.

[0073] Fig. 2A Figure 1 shows a perspective view of the entry side 15 of the preferred rolling stand 1, in which the three rolls 20.1, 20.2, 20.3 are arranged in the anti-Y arrangement and the adjustment port 30 of the eccentric adjustment is aligned horizontally to the side.

[0074] Along the outer surface 12 of the frame housing 10, recesses and bores are visible, which are for receiving the roller shafts, wherein in Fig. 2A Only the drive-side end 24.2 of the roll shaft belonging to the roll 20.2 is directly visible, and the adjustment connection 30 is provided. Furthermore, it can be seen that the clamping point 44.6 on the inlet side 15 facing the viewer is connected by a bolt to the clamping point 44.6 opposite on the outlet side 13, so that a clamping force applied to the clamping points 44.6 can be directed directly and stably between these clamping points 44.6 to fix the roll stand 1 in its stand mount without critically deforming or even damaging sensitive parts of the stand housing 10 through excessive local force application. The clamping points 44.2-44.5 are identically designed and connected to each other.

[0075] Fig. 2B shows how Fig. 2A the inlet side 15 of the rolling stand 1 from a different perspective than Fig. 2A , in which the drive-side end 24.1 of the roller shaft of the roller 20.1 can be seen.

[0076] The Figuren 3A und 3B Each image shows a side view of the rolling mill stand, in which the three rolls are arranged in an anti-Y configuration. Fig. 3A shows the corner 16.1 and the side surfaces 14.1 and 14.6 as well as the adjustment connection 30 and the drive-side ends 24.2 and 24.3 of the roller shafts of the rollers 20.2 and 20.3.

[0077] Fig. 3A Figure 1 further shows two water inlet openings 43.2, which can be connected to a water connection in the scaffold housing to receive water into the scaffold housing 10 and to discharge it through the water outlet opening 42.2, for example to supply it to a water pipe 66 or an inlet roller guide 60. Fig. 3A Furthermore, an air connection 41.2 can be seen next to the drive-side end 24.2, through which compressed air can be supplied to the frame housing 10 in order to protect the interior of the frame housing 10, in particular the gear parts located therein, for example the eccentric adjustment, from water ingress by means of overpressure.

[0078] Fig. 3B shows the corner 16.1 from Fig. 3A The opposite corner 16.4 and the side surfaces 14.3 and 14.4 opposite side surfaces 14.1 and 14.6. Furthermore, the sliding rails 40.3 and 40.4 can be seen on both the inlet side 15 and the outlet side 13. In the perspective of the Fig. 3B The drive-side end 42.1 of the roller shaft of the roller 20.1 can be seen at the front, where an air connection 41.1 and two water inlet openings 43.3 are also shown. REFERENCE MARK LIST

[0079] 1 Rolling stand 10 Stand housing 12 Outer side 13 Outward side 14.1, 14.2, 14.3, 14.4, 14.5, 14.6 Side surface 15 Inward side 16.1, 16.2, 16.3, 16.4, 16.5, 16.6 Corner 19 Rolling axis 20.1, 20.2, 20.3 Roll 21 Caliber 22 Rolling surface 24.1, 24.2, 24.3 Drive-side end 26.1, 26.2, 26.3 Mounting element 30 Adjustment connection 40.2, 40.3, 40.4, 40.5 Slide rail 41.1, 41.2, 41.3 Air connection 42.1, 42.2, 42.3 Water outlet opening 43.1, 43.2, 43.3 Water inlet opening 44.2, 44.3, 44.4, 44.5, 44.6 Clamping point 50.1, 50.2, 50.6 Coupling clamping area 52 Terminal strip 60 Inlet roller guide 62 PTO shaft 64 Roller adjustment connection 66 Water pipe K Tilting axis for switching between Y-arrangement and anti-Y-arrangement

Claims

1. Rolling stand (1) for rolling metallic bars, wires or tubes along a rolling axis, comprising: a stand housing (10) whose outer surface (12) from the view along the rolling axis (19) has at least six side surfaces (14.1-14.6) of equal length arranged rotationally symmetric about the rolling axis (19), wherein two side surfaces (14.1, 14.4, 14.2, 14.5, 14.3, 14.6) form a pair of side surfaces (14.1-14.6) lying parallel to each other; and three rollers (20.1-20.3) each mounted on a roller shaft, surrounding the roller axis (19) in a star shape, which together form a caliber (21), wherein the three roller shafts are mounted by means of eccentric bushings in bearing bores of the frame housing (10) such that a radial distance of the rollers (20.1-20.3) to the roller axis (19) is adjustable.

2. Rolling stand (1) according to claim 1, wherein at least one further side surface (14.1-14.6) is aligned at an angle of 120° to each of the side surfaces (14.1-14.6) from the view of the rolling axis (19).

3. Rolling stand (1) according to one of the preceding claims, wherein each of the three roll shafts runs parallel to each of the pairs of parallel to each other side surfaces (14.1, 14.4, 14.2, 14.5, 14.3, 14.6).

4. Rolling mill stand (1) according to one of the preceding claims, the outside of which (12) has exactly six side faces (14.1-14.6) forming a regular hexagon.

5. Rolling stand (1) according to one of the preceding claims, which further comprises an adjustment connection (30), in particular a remote adjustment connection, for introducing an adjustment torque in order to adjust a radial position of the roll shafts for setting the caliber (21).

6. Rolling stand (1) according to claims 4 and 5, wherein the adjustment connection (30) is arranged on the outside (12) of the stand housing (10) in a corner (16.1) of the regular hexagon.

7. Rolling stand (1) according to claim 5 or 6, wherein the positioning connection (30) is manually operable or wherein the remote positioning connection is automatically operable by a motor.

8. Rolling mill stand (1) according to one of the preceding claims, wherein the stand housing (10) is closed and undivided and is in particular made from a monoblock.

9. Rolling stand (1) according to one of the preceding claims, wherein each of the three roll shafts or rolls (20.1-20.3) can be driven separately by its own assigned motor.

10. Rolling stand (1) according to claim 9, wherein the three roll shafts each have a drive-side end (24.1-24.3) for separate drive, which projects outwards from one of the side surfaces (14.2, 14.4, 14.6) of the stand housing (10).

Images