Metal deforming – By use of roller or roller-like tool-element – With carrier for roller-couple or tool-couple
Reexamination Certificate
1999-03-04
2001-04-17
Butler, Rodney A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
With carrier for roller-couple or tool-couple
C072S243600
Reexamination Certificate
active
06216519
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a roll for a roll stand including a roll shaft with at least one roll ring mounted on the roll shaft, wherein the roll shaft is axially displaceable. The roll stand for rolling a metal strip may be, for example, a two-high stand, a four-high stand or six-high stand.
2. Description of the Related Art
When manufacturing a metal strip, the thickness and cross-section thereof are determined by the roll gap. The precise contour of the roll gap adjusted under load is dependent on various variables. These variables are the wear of the work rolls, the elastic deformation of the roll systems, the roll camber, as well as the thermal crown which is due to a non-uniform heating of the roll body between the center of the body and the edge of the body. Without making corrections by means of adjusting units, the crown of the work rolls continuously increases with increasing throughput of the rolling stock, and because of the thermal crown which changes in this manner the roll contour increasingly deviates from the desired contour, for example, a parabola.
In order to influence the deviation of the actual profile shape from the desired profile shape of the rolled strip during the rolling procedure, it is known in the art to construct single-piece work rolls or pairs of intermediate rolls in such a way that the roll body has a curved contour which deviates from a straight line extending parallel to the roll shaft, wherein this curved contour extends over the entire length of the roll body, and wherein the rolls are axially displaceable in opposite directions as disclosed in DE 30 38 865 C1. Consequently, the change of the thermal crown and the wear of the work rolls is compensated in such a way that the thermal crown is equal to the desired contour. In this connection, the roll gap is influenced by the curved contour of the roll bodies together with a relative displacement of the cooperating rolls.
In a roll of the above-described type disclosed in U.S. Pat. No. 4,407,151, the support load is influenced by an axial displacement of the roll shaft or support shaft.
Moreover, various systems are known in the art in which the crown of a roll, and also the support width in individual cases when the roll is used as a back-up roll, can be changed by means of hydraulic measures. In these systems, such as Nipco roll, VC roll, Sumitomo roll, inflatable roll, etc., the external shape or crown of the rolls and possibly also the resiliency of the roll relative to external loads along the roll body are changed by means of oil pressure cushions and/or hydraulically actuated support shoes and, thus, are adjusted to the rolling conditions.
The above-described embodiments have the disadvantage that the hydraulic system is complicated and, therefore, not very reliable in its operation. In addition, since the tightness of a roll is usually not sufficient, a contamination of the rolling oil or rolling emulsion by the hydraulic oil cannot be prevented.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to provide a roll of the above-described type in which the adjustment of the roll gap during the rolling process can be simplified and can be carried out more precisely as compared to conventional measures, and in which the possibilities of adjusting the individual roll pairs is multiplied.
In accordance with the present invention, the surfaces of at least two of the inner roll components enclosed by an outer roll ring have contours which are curved in the axial direction, wherein the curved contours are turned relative to each other by 180°.
Except for being turned relative to each other by 180°, the mathematical functions describing the surface contours of these two inner components in the axial direction are equal. Although it is recommended that surfaces which face each other are contoured in accordance with the present invention, the contours of the at least two inner components in questions do not have to be in direct contact, but they can also be separated from each other by one or more roll rings or shells, even if the latter are also contoured themselves; the function of the pair of components under consideration is only slightly affected as a result.
The actual shape can be adjusted much more precisely because the multiple-component construction of the roll according to the present invention provides already within a single roll a variety of possibilities for changing the outer contour of the roll in order to adjust the desired roll gap. This variety is further increased if, in accordance with a proposal of the present invention, not only the roll shaft but also the roll ring or roll rings are axially displaceable. Another advantage of the roll according to the present invention is the fact that the outer surface, i.e., the surface which is subjected to the greatest wear, has an axis-parallel or cylindrical shape. Consequently, when regrinding this surface, it is then not necessary to take into consideration any contours, as is the case in single-piece curved contoured rolls in which it is necessary to precisely take into consideration the oppositely directed surface contours when processing the respective pairs of rolls. On the other hand, in the roll according to the present invention which has an internal curvature, a simple cylindrically-shaped grinding is sufficient.
Accordingly, advantageous further developments of the invention provide that the roll shaft and the inner roll ring or the outer surface of the inner roll ring and the inner surface of an outer roll ring have a curved contour, wherein the roll rings can be constructed as single pieces or of several parts. An outer roll ring arranged on the internally contoured inner roll ring always has on the outer surface thereof a cylindrical shape.
In accordance with another proposal of the present invention, the curved contoured surfaces which face each other are constructed so as to engage with each other in a positively engaging manner, wherein the surfaces can be provided with a thread. This makes it possible to take into consideration the fact that it may be necessary under certain circumstances to transmit torques between the individual components of the roll which exceed the maximum torque which can be transmitted solely by frictional engagement.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
REFERENCES:
patent: 4407151 (1983-10-01), Gronbech
patent: 4683744 (1987-08-01), Ginzburg et al.
patent: 4781051 (1988-11-01), Schultes et al.
patent: 4955221 (1990-09-01), Feldmann et al.
patent: 3038865 (1982-12-01), None
patent: 9703768 (1997-02-01), None
Hartung Hans Georg
Weingarten Ludwig
Butler Rodney A.
Kueffner Friedrich
SMS Schloemann--Siemag Aktiengesellschaft
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