Metal deforming – With cleaning – descaling – or lubrication of work or product – Lubricating
Reexamination Certificate
2000-06-27
2001-06-26
Butler, Rodney A. (Department: 3725)
Metal deforming
With cleaning, descaling, or lubrication of work or product
Lubricating
C072S041000
Reexamination Certificate
active
06250120
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to rolling mills where the roll necks are rotatably supported in bearings contained in so-called “chocks”, and is concerned in particular with an improvement in the manner in which such chocks are supported.
2. Description of the Prior Art
The invention is particularly useful in, although not limited to, “flat” mills, so-called because the products they roll are flat and relatively wide, e.g., plates, strips, and the like. It will be seen from
FIG. 1
that the bearings
10
for the rolls
12
in flat mills are long to allow them to carry the large loads typically encountered when rolling flat products. The rolls also are necessarily long to accommodate the width of the products being rolled, and consequently they tend to bend and take on an angle &agr; in the bearing area. To evenly distribute the load over the full lengths of the bearings, the chocks
11
which contain the bearings must be able to tilt to accommodate the angle of the roll neck under load.
In the past, as shown in
FIG. 2A
, cylindrical rocker plates
14
worked well in allowing the chocks
11
to tilt angularly because of the line contact as at
16
. The line contact provided a pivotal location, but did not supply adequate support, so the size of the chocks had to be increased substantially to maintain the required stiffness. Alternatively, as shown in
FIG. 2B
, spherical seats
18
provided a larger support area which in turn allowed chock sizes to decrease. However, spherical surfaces must slide to allow the chock to tilt. Due to the high rolling loads, the resulting frictional resistance at the larger contact interface acted to prevent the chocks from tilting properly.
SUMMARY OF THE INVENTION
In accordance with the present invention, the chocks and their associated supports are in contact with each other at curved area interfaces arranged to accommodate chock tilting under rolling loads. A lubricant is introduced under pressure at the chock/support interfaces. The area contact at the curved interfaces provides increased support, thereby making it possible to decrease the size of the chocks without sacrificing stiffness. At the same time, the pressurized introduction of the lubricant reduces frictional resistance to chock tilting, thus allowing the system to be fully responsive to rolling loads.
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Osgood Peter N.
Winslow, Jr. Earl S.
Wojtkowski, Jr. Thomas C.
Butler Rodney A.
Morgan Construction Company
Samuels Gauthier & Stevens
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