Metal deforming – By use of roller or roller-like tool-element – With carrier for roller-couple or tool-couple
Patent
1999-12-03
2000-11-28
Butler, Rodney A.
Metal deforming
By use of roller or roller-like tool-element
With carrier for roller-couple or tool-couple
722412, B21B 1314
Patent
active
061519448
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a flat product rolling installation and applies especially to the hot or cold rolling of a metal band or sheet.
The invention also covers the implementation process of such a rolling installation.
A roll mill generally consists of a fixed stand with two separate standards linked by a spacer and between which are provided several superimposed rolls with parallel axes, respectively two working rolls defining a passage gap for the product and one or several back-up rolls.
In the so-called trio stands, a single back-up roll is used for a small diameter working roll, whereas the other working roll is of sufficient diameter to resist intrinsically to the loads applied.
Conversely, the so-called stands are symmetrical and comprise two working cylinders resting respectively on the side opposite to the gap, each on a larger diameter back-up roll.
Quinto or sexto stands are also known, in which an intermediate roll is interposed between a working roll and a corresponding back-up roll.
Finally, in so-called <<Z-High>> stands, which are of the sexto type, each working roll is connected to two side bearing assemblies, called inserts, arranged on either side of the working roll, in the space provided between the said working roll and the periphery of the related intermediate roll.
In all cases, the roll stands are designed to hold all the rolls (back-up, working, intermediate rolls, . . . ) in a vertical clamping plane containing their axes and more or less perpendicular to the horizontal rolling plane of the product, also called <<passing line>>.
In so-called reversible stands, the product circulates in both directions, whereas roller tables are provided on either side of the stand. In so-called tandem mills, the product forms a continuous band that passes successively through several roll stands, each reducing the thickness of the product.
It is necessary to adjust the relative levels of the rolls in order to set the level of the rolling planes and the thickness of the gap.
Usually, in a conventional roll stand, each roll is mounted to rotate on a shaft whose both ends constitute, each, a journal revolving in a bearing housed in a supporting part, called a chock. To enable height-adjustment of the rolls, the chocks are mounted to slide in windows provided respectively in both standards of the stand, along guiding faces, which are parallel to a clamping plane going through the roll axes.
The level of the rolling plane is normally determined by that of the lower back-up roll, which rests, at its ends, on fixed or thickness-adjustable shims.
Balancing jacks resting on the chocks of the working rolls regulate their relative levels in order to determine the thickness of the gap and enable, moreover, placing the rolls at the level of the fixed disassembly rails.
Other balancing jacks, resting on the chocks of the upper back-up roll enable adjusting the level of the said upper roll between a disassembly position for which the rolls can be moved apart from one another and the rolling position determined by the clamping means resting on the standards.
Since the diameter of the working rolls is smaller than that of the back-up rolls and since their chocks are also smaller, the guiding faces of the working rolls are closer to one another than those of the back-up rolls. In a quarto roll mill, for instance each window consists of a rectangular aperture whose width corresponds to the chocks of the back-up rolls and extending over the whole height occupied by the rolls, and the guiding faces of the chocks of the working rolls are provided on protruding sections directed to the inside of the window.
Generally, the product to be rolled having an initial thickness is passed between both working rolls whose spacing is less, in order to determine a reduction of the initial thickness by rolling the product. Both working rolls tend therefore to move apart from one another and each rests upon a larger diameter back-up roll, whose level is maintained by clamping means, for instance of a screw
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patent: 4882922 (1989-11-01), Dominique
patent: 4936207 (1990-06-01), Niskanen et al.
patent: 4989431 (1991-02-01), Stotz
Butler Rodney A.
Vai Clecim
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