EP0943377A1 - Roll for a rolling stand - Google Patents

Abstract

The roll (1) has an axially movable axle (2) and an outer roll shell (4). The surfaces (5, 6) of at least two inner components (2, 3) of the roll have contours which are curved in the axial direction, and are rotated through 180 relative to one another.

Description

The invention relates to a roll for a roll stand, comprising a roll axis at least one roller ring arranged thereon, the roller axis being axial is movable. The rolling stand for rolling a metal strip can e.g. as Be designed as a duo, quarto or sexto framework.

When manufacturing a metal strip, the thickness and cross-section are through Roll gap determined. The exact contour of the roll gap that occurs under load depends on various influencing factors. These are the wear and tear of the Work rolls, the elastic deformation of the roll system, the roll grinding (Crowning) and the thermal crowning as a result of uneven heating the roller bale between the center of the bale and the edge of the bale. Without the correction the crowning of the work rolls increases with actuators Rolling material throughput is constantly increasing, and due to the changing thermal Bombing increasingly deviates from the target contour, e.g. a Parabola, ab.

About the deviation of the actual profile shape from the target profile shape of the rolled strip To influence during the rolling process, it is known to work in one piece or To design intermediate roller pairs so that the roller bale one of the axially parallel Straight line deviating curved contour that extends over the The entire length of the roll barrel extends, the rolls in opposite directions axially are movable (see. DE 30 38 865 C1). The change in the thermal crown and the work roll wear is thus in the sense of an approximation of the actual contour compensated. The roll gap is determined by the curved contour of the roll barrel in interaction with a relative shift of the collaborators Rolls affected.

In the case of a roller of the type mentioned at the beginning of US Pat. No. 4,407,151 The load capacity is created by axially shifting the roller or support axis influenced.

Various systems are also known in which the crowning of one Roller and in the case of use as a backup roller in individual cases also the support width can be changed with the help of hydraulic measures. With these systems (Nipco roller, VC roller, Sumitomo roller, inflatable roller, etc.) is the external shape or crowning of the rollers and possibly also the flexibility the roller to external loads along the roller barrel with the help of oil pressure pads and / or hydraulically operated support shoes changed and thus to the rolling conditions customized.

A disadvantage of these designs is the complex and correspondingly little reliable hydraulics. In addition, one is usually not sufficient Tightness Contamination of rolling oil or rolling emulsion by the hydraulic oil do not avoid.

The invention is therefore based on the object of a generic roller create with which the setting of the roll gap during the rolling process simplify and make more precise than the known measures and which reproduces the setting options of the individual roller pairs.

This object is achieved in that the surfaces of at least two of the inner, enclosed by an outer roller ring Roll components in the axial direction have curved contours are rotated to each other by 180 °. Apart from that, they are the surface contours this pairing in the axial direction descriptive mathematical functions equal. Although it is advisable to contour surfaces facing one another in this way to train, the paired contours do not need in direct To be in contact, but can also by one or more roller rings or Shells must be separated from each other, even if they are contoured again; the This only slightly affects the function of the pairing in question.

The actual shape can be set much more precisely because of the multi-part construction and assembly the roller according to the invention already within a single roller offers a variety of ways to change the outer contour of the roller set the desired roll gap. All the more so if after a suggestion the invention not only the roller axis, but also the or Roller rings are axially displaceable. Another advantage of the invention Roller is that its outer surface, i.e. the area the largest Wear is subject to an axially parallel or cylindrical shape. At the Regrinding this surface therefore needs no consideration of any Contouring to be taken, like the one-piece, curved contoured Rolling is the case in which when reworking the respective roller pairs opposing surface contour must be taken into account precisely. With one A roller according to the invention having internal curvature, however, is sufficient simple, cylindrical cut.

Advantageous embodiments of the invention therefore provide that the roller axis and the inner roller ring or the outer surface of an inner and the inner Surface of an outer roller ring have a curved contour, wherein the roller rings can be made in one or more parts. Always has one outer roller ring arranged on the internally contoured inner roller ring outside a cylindrical shape of its outer surface.

According to a proposal of the invention, the mutually facing are curved contoured surfaces interlockingly formed, with can be provided with a thread. It can be taken into account that it is under Circumstances may be necessary between the individual components of the roller To transmit moments beyond the maximum that can be transmitted solely by friction Moment go out.

Fig. 1

in der Längsansicht eine mehrteilige bzw. -schalige Walze mit Innen-Krümmung, d.h. in axialer Richtung gepaarter gekrümmter Kontur von Walzenachse und innerem Walzenring;

Fig. 2

die Walze nach Fig. 1 mit axial nach links verschobenem inneren Walzenring;

Fig. 3

eine Quarto-Walzenanordnung mit eine Innenkrümmung gemäß Fig. 1 aufweisenden Stützwalzen;

Fig. 4

die Walzen-Anordnung nach Fig. 3 mit sowohl axial verschobenen Walzenachsen als auch axial verschobenen inneren Walzenringen;

Fig. 5

im Querschnitt eine formschlüssig in einen Walzenring eingreifende Tragachse; und

Fig. 6

im Längsschnitt eine Walze bei der die konturierten Innen- bzw. Außenseiten, d.h. die einander zugewandten Oberflächen von Walzenachse und innerem Walzenring über ein Gewinde ineinandergreifend verbunden sind.

Further features and advantages of the invention result from the patent claims and the following description in which exemplary embodiments of the subject matter of the invention are explained in more detail. Show it:

Fig. 1

in the longitudinal view a multi-part or -shell roller with inner curvature, ie curved contour of the roller axis and inner roller ring paired in the axial direction;

Fig. 2

the roller of Figure 1 with the inner roller ring axially displaced to the left.

Fig. 3

a quarto roller arrangement with an inner curvature according to FIG. 1 having backup rollers;

Fig. 4

the roller arrangement of Figure 3 with both axially shifted roller axes and axially shifted inner roller rings.

Fig. 5

in cross-section a support shaft engaging in a form-fitting manner in a roller ring; and

Fig. 6

in longitudinal section a roller in which the contoured inner and outer sides, ie the mutually facing surfaces of the roller axis and the inner roller ring are connected by a thread.

A roller 1 shown in FIG. 1 to be used as a work or intermediate roller consists of a roller axis 2 with an inner roller ring arranged thereon 3 and a concentrically surrounding outer roller ring 4. Die Surface 5 of the roller axis 2, like the - inner - surface 6 of the inner roller ring 3 a contour curved in the axial direction, the Surface contours of this pair are rotated by 180 ° to each other. The outer Roll ring 4, however, has a cylindrical, i.e. uncontoured shape. For variable setting of the roll gap is in addition to the roller axis 2, the inner Roller ring 3 axially displaceable; an operating position with the adjustment to the left inner roller ring 3 and roller axis 2 shifted to the right is in FIG. 2 shown. By moving them in opposite directions by the same amount, by the same educational function described, but created by 180 ° offset contours an inner constraint, which in this example becomes a symmetrical barrel Widening of the outer roller ring (or shell) 4 and thus the entire roller combined with pressure distributions that have changed symmetrically compared to the initial state between the components of the roller.

In addition to changing the external shape, which is a change in the crowning of the Corresponds to roller 1, it is also possible with suitable contouring, symmetrical Detachments of the roller rings 3 and 4 with each other in certain areas along to reach the bale. In these areas of "gaping" roller rings the sinks Roll rigidity clearly. Especially when rolling strips that clearly are narrower than the bale length, this results in a significant advantage, because adapting the support width to the load width (equal to the bandwidth) reduces the Total deflection of the work rolls in the decisive factor for the flatness Band area significantly.

3 and 4 show examples of the use of the roller 1 as backup rollers for one-piece work rolls 7, 8 at different widths of the rolled strip 9 (Fig. 3) or 10 (Fig. 4). In the case of FIG. 3, the load or Band width of the support width by means of the rollers 1; neither the inner roller rings 3 the roller axes 2 are still axially displaced. In this situation takes place over the entire axial course of the curved contour one touch - corresponding to the Length of the inner roller rings - the curved surfaces 5 and 6 of the roller axis 2 and inner roller ring 3 instead. In contrast, the example of FIG. 4, which represents a rolling case that occurs frequently in practice, a multi-part, inside complementary curved surfaces supporting roll 1 during rolling of a less wide rolled strip 10 is still in contact beyond the strip edge with the work roll 7 or 8 to be supported. The contouring of the surfaces 5 or 6 is chosen here so that it is due to the left and right facing Arrows axial opposite movement of each inner roller ring 3 and Roller axis 2 with this setting to a previously mentioned partial Detachment 11 inside the roll 1 and thus to increased roll compliance comes at these points, with the result that the load due to the Interaction with the other roller is correspondingly low and therefore practical does not contribute to support. The relevant span width is therefore limited to the largely seamless area that corresponds to the width of the rolled strip 10. The increased roll compliance in the area next to the rolled strip 10 leads to a Reduction of the band edge sharpening.

A configuration to possibly between the individual elements of the Roller to transmit such moments that can be transmitted only by friction maximum torque is shown in Figs. 5 and 6, being there the roller axis 102 and the roller ring 103 concentrically surrounding it are positively connected. With a work or backup roll 100 with on the inner roller ring 103 also arranged cylindrical outer Roller ring 104 is there the axial displaceability with non-cylindrically contoured Surfaces guaranteed by a roller axis thread 12 (see. Fig. 6).

Claims (7)

Roll for a roll stand, comprising a roll axis with at least one roll ring arranged thereon, the roll axis being axially displaceable,
characterized,
that the surfaces (5, 6; 105, 106) of at least two of the inner roller components (2, 3; 102, 103) enclosed by an outer roller ring (4; 104) have contours which are curved in the axial direction and are at 180 ° to one another are rotated. Roll according to claim 1,
characterized,
that the roller axes (2; 102) and / or the roller rings (3, 4) are axially displaceable. Roll according to claim 1,
characterized,
that the roller axis (2) and the inner roller ring (3) or the outer surface of an inner and the inner surface of an outer roller ring (3, 4) have a curved contour. Roll according to one of claims 1 to 3,
characterized,
that the roller rings (3, 4) are in one or more parts. Roller according to one of Claims 1 to 4,
characterized,
that an outer roller ring (4) arranged on the internally contoured inner roller ring (3) has a cylindrical shape. Roll according to one of claims 1 to 5,
characterized,
that the mutually facing curved contoured surfaces (105, 106) are designed to interlock. Roller according to claim 6,
characterized,
that the curved contoured surfaces (105, 106) are provided with a thread (12).

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