Metal deforming – By use of roller or roller-like tool-element – With carrier for roller-couple or tool-couple
Reexamination Certificate
1999-07-08
2001-01-09
Butler, Rodney A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
With carrier for roller-couple or tool-couple
C072S248000
Reexamination Certificate
active
06170311
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device with a stepped adjustment for adapting the vertical position of the rolls of a roll stand to the rolling line, wherein the rolls are supported on both sides in chocks and arranged so as to be raisable and lowerable in roll housings, particularly in a four-high skin pass stand or sizing stand operated with low rolling force.
2. Description of the Related Art
For rolling technological reasons, different roll diameters have to be used in roll stands; this primarily concerns the work rolls. Different measures are known for adjusting the upper edges of the work rolls to the rolling line to ensure that the diameter differences of the rolls do not result in substantial changes of the rolling line. These measures include, for example, the placement of fitting plates selected in accordance with the required dimension of compensation, selectively moving fitting pieces of different heights received in a sliding frame under the chocks into the housing windows of a four-high stand, or wedge-type adjustments with a pair of wedges arranged under each chock of the back-up roll, as disclosed in EP 0 513 946 B1. These pairs of wedges are arranged in such a way that each upper wedge element can be raised and lowered by means of a lifting device together with the respective roll chock and the wedge surfaces of both wedges are provided with steps, wherein the steps engage into each other so as to support the wedge elements. These known step-type adjustments are very complicated and make the roll exchange very difficult.
DE 44 17 274 A1discloses rolling in the same roll stand high-strength steel qualities as well as very soft steel qualities which can also be deep-drawn well in skin passes with very small rolling forces, wherein the cumulative rolling force of at most 1,000 t is very low as compared to reducing stands. The rolling force required for the skin pass procedure is applied, after lifting a back-up roll, by the bending device of one of the remaining rolls of the roll set of the lifted back-up roll. In this stand, the rolling line adjustment by means of the conventional wedges is very complicated.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to provide a device of the above-described type which can be used with reduced technical means universally, i.e., for example, in two-high stands as well as four-high stands or six-high stands, particularly in-line four-high skin pass stands, and wherein a rapid work roll exchange is possible.
In accordance with the present invention, the chocks of one of the rolls have on their sides facing the roll housings a toothed segment and complementary toothed rails are arranged in the roll housings opposite the toothed segments and are movable toward and away from the toothed segments.
Consequently, the stepped adjustment in the form of complimentary toothed segments and toothed rails—wherein the toothed segments advantageously are shorter than the toothed rails because they are located in the chocks which are anyhow guided in the windows of the roll housings so as to be raisable and lowerable—is located exclusively outside of the space required for the roll exchange, so that the roll exchange can carried out unimpededly and quickly. In addition, the roll housings can be of simple construction, for example, smooth, as is the case with respect to the toothed elements which engage each other and, depending on their construction, can also transmit high rolling forces in the engaged position. The secure engagement in the tooth gaps after the adjustments can be achieved by a distance measuring system mounted in the crossbeam of the housing, wherein the distance measuring system is connected to a higher-order control.
In accordance with a further development of the invention, the toothed rails are arranged so as to be actuated by cylinders and slidable in vertical slots of the roll housings. The length and the width of the vertical slots correspond to the dimensions (for example, about 80 mm wide and about 650 mm high or long) of the toothed rails which are generally plate-shaped. The toothed rails are connected to the piston rod of a suitable cylinder flanged from the outside to the roll housing. The length of the plate-shaped toothed rails is determined by the roll diameter differences which are being used. As predetermined by the higher-order control, the cylinders move the toothed rails toward the rear or away from the toothed segments of the chocks into the disengaged position, and, as soon as the toothing of the toothed rails has engaged in the vertical slots of the roll housing, the roll sets are completely exposed for carrying out the work roll exchange. After mounting a new set of work rolls, it is merely necessary to lift the chock with the toothed segments into the new position, which can be carried out by means of the balancing cylinders. Subsequently, it is merely necessary to reverse the control of the cylinder drives of the toothed rails for placing the toothed rails in engagement with the toothed segments.
In accordance with a further development of the invention, the toothed segments are formed on discs which are loosely placed in recesses of the side surfaces of the chocks. Since the toothed segment is pivotable or movable to a certain extent as a result of the loose seat of the disc, the toothed segment can automatically adapt to the bending line predetermined for the work rolls and/or intermediate rolls by means of the bending devices or to changes of the bending line as a result of the rolling force.
In accordance with another proposal of the present invention, the discs are engaged on both sides of the toothed segments by wear or sliding plates screwed to the side surfaces of the chocks. This makes it possible to utilize the wear plates, which are present anyhow, to continue to securely hold the discs which are loosely placed in the recesses without limiting the mobility of the discs.
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: 2961901 (1960-11-01), Wheeler
patent: 4332192 (1982-06-01), Joutsjoki
patent: 4417274 (1995-11-01), None
patent: 0513946 (1995-02-01), None
Butler Rodney A.
Kueffner Friedrich
SMS Schloemann--Siemag Aktiengesellschaft
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