Presses – Methods
Patent
1997-05-02
1998-07-07
Gerrity, Stephen F.
Presses
Methods
100 47, 100162B, 100170, 100329, 100334, D21G 102
Patent
active
057752117
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a process and apparatus for driving a roller with a rotary hollow cylinder that forms the working roller circumference, with a non-rotary crosshead that extends through the hollow cylinder lengthwise, leaving a radial distance from the inside cylindrical surface of the hollow cylinder all around, to which external forces can be transferred at the ends, with a first row of several hydrostatic supporting elements arranged on the crosshead and resting on it, closely following each other in its lengthwise direction, which can be controlled individually or in small groups of at most about three supporting elements, by means of which independent forces directed against the roller gap can be exerted against the inside cylindrical surface of the hollow cylinder, and with at least a second row of several hydrostatic supporting elements arranged on the crosshead and resting on it, following each other in its lengthwise direction, by means of which forces directed away from the roller gap can be exerted against the inside cylindrical surface of the hollow cylinder, with supply lines for hydraulic pressure fluid provided in or on the crosshead for each individual supporting element, and with a control device by means of which the pressures in the individual supply lines can be selected independently of one another.
Such rollers are disclosed, for example, in EP 210 388; rows of supporting elements act on the hollow cylinder toward different sides in the plane of effect of the roller, i.e., generally in the connecting plane of the roller (defined by the plane in which the axis of the roller connects with the axis of a counter-roller), so that variable force profiles can be exerted on the hollow cylinder over its length, and a desired, generally non-uniform linear force profile occurs in the roller gap. This linear force profile is dependent on the forces exerted by the individual supporting elements and the deformation properties of both the hollow cylinder and the product. For each individual case, the applied forces required to achieve a certain linear force profile can be calculated using known methods, such as the finite element method.
The supporting elements in known rollers interact with the crosshead as a piston and cylinder. Each supporting element has its own supply line and can therefore have pressure fluid applied to it independently of the other supporting elements. In each supporting element, the supply lines in the crosshead open into a pressure chamber assigned to the element, and the supplied pressure fluid presses the supporting element radially outward, so that it rests against the inside cylindrical surface of the hollow cylinder with a contact surface adapted to this inside cylindrical surface. Flat bearing pockets are formed in the contact surface, which are connected with the pressure chamber via throttle bores. The pressure fluid supplied to the pressure chamber exits into the bearing pockets via the throttle bores, and therein forms a hydrostatic pressure cushion, by which the supporting elements exert their force against the inside cylindrical surface of the hollow cylinder. The pressure fluid furthermore constantly flows outward, over the edge of the bearing pockets, and forms a liquid film in the edge regions of the bearing pockets. This prevents metal-to-metal contact between the supporting elements and the inside cylindrical surface of the hollow cylinder, and permits additional force to be transferred to the hollow cylinder.
In the aforementioned, known roller, the forces are transferred by means of the pressure fluid, which act in the supporting element, and the interstice between the crosshead and the inside cylindrical surface of the hollow cylinder is not involved in formation of the linear force, i.e., it makes no difference whether or not it is filled with pressure fluid.
However, the invention also has significance for rollers according to DE 38 20 974 C2. In such rollers, the interstice between the crosshead and the ins
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Das HYDREIN-Walzensystem, Kleinewefers GmbH, Krefeld (received at German Patent Office in 1988).
Eduard Kusters Maschinenfabrik GmbH & Co. KG
Gerrity Stephen F.
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