Metal deforming – By use of roller or roller-like tool-element – Roller or roller-like tool-element of particular configuration
Patent
1997-08-15
1998-11-24
Hail, III, Joseph J.
Metal deforming
By use of roller or roller-like tool-element
Roller or roller-like tool-element of particular configuration
72237, B21B 3920, B21B 3100
Patent
active
058393145
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a roll housing with a closed frame construction, especially for heavy roll stands for rolling sheet metal and strip. The roll housing comprises two housing uprights, which delimit the housing window for accommodating and guiding the roll chucks (and roll bearings). The two housing uprights also have inner surfaces that are parallel to each other. Upper and lower traverses connect the uprights.
BACKGROUND OF THE INVENTION
Conventional rolling mills consist basically of two roll housings, in which the rolls, which run in bearings that are supported by chucks, are arranged. The two housings are connected to each other at the top and the bottom by transverse connecting parts. The transverse connecting parts and the housings constitute the roll stand. The housings, as constructive bearing parts of the roll stand, absorb all of the forces arising during the rolling process. The housings must therefore have high strength with low deformation and, at the same time, must permit an advantageous arrangement of all of the elements of the stand. For heavy rolling mills, one-piece housings with a closed frame construction are preferred.
As stated above, the housing windows that remain between the housing uprights accommodate the chucks for the bearings of the rolls. The housing windows must therefore be equipped with guides, on which the chucks can move in a sliding fashion. For this reason, exact parallelism is required between the inner surfaces (which are located across from each other) of the housing windows. Also required are narrow distance tolerances, so that the kinetic play between the chucks and the housing uprights is minimized, ensuring only slight size deviations in the rolled material.
In designing roll housings, especially the closed housings described above, it is important to consider the fact that, during the rolling process, the resultant force is oriented roughly vertical to the roll force. This means that the total system is subjected to two equal forces, which act in opposite directions and seek to press the traverses apart from each other. In calculatory terms, a closed housing can be seen as an elastic frame, in which a tensile force (half as great, for example, as the roll force) acts in the vertical direction in the cross-section of the housing uprights, while at the same time a bending moment acts on the corners of the housing (FIG. 2). The traverses, which are connected fixedly to the housing uprights, are stressed exclusively by bending. It is assumed that the greatest stress in the housing exists on the housing uprights in the window areas, because--along with the tensile stresses--these uprights are bent in the direction of the windows by the effective bending moment. The housing window is "necked," i.e., the empty space between the inner sides of the uprights becomes smaller as the result of the roll load.
Since the required rigidity of the roll stand must be guaranteed, every designer attempts to ensure that "necking," as the bending of the housing uprights in the direction of the window is called, is kept to a minimum.
It is easily understood that excessive necking in a roll stand causes the chucks to jam and interferes with their controllability. It is impossible to enlarge the clearance between the chucks and the inner surfaces of the windows, because doing so would impair the stability of the chuck guidance, and size deviations would occur in the rolled material as a result. For these reasons, necking in rolls stands often makes it necessary to retrofit the windows, which entails large expenditures of time and money.
Various proposed solutions to minimize necking in roll stands have, in practice, been only conditionally effective. For example, an attempt has been made, by enlarging the traverses, to reduce the moment that bends the housing uprights. Moreover, the housing uprights themselves have been enlarged, so as to counteract their bending with greater resistance moment. In both cases, the roll stands became heavier and requ
REFERENCES:
patent: 1973425 (1934-09-01), Biggert
Butler Rodney
Hail III Joseph J.
Mannesmann Aktiengesellschaft
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