Housingless roll stand

Details Housingless roll stand Housingless roll stand

2000-02-16

2001-04-03

Butler, Rodney A. (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

With carrier for roller-couple or tool-couple

C072S237000

Reexamination Certificate

active

06209377

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to rolling mills, and is concerned in particular with an improvement in the design of so-called “housingless” roll stands.
2. Description of the Prior Art
In the conventional housingless roll stand, the roll necks of the two work rolls are journalled in bearings contained in pairs of clocks located on opposite sides of the mill center line. The chocks of each pair are interconnected by two screw posts. The four screw posts (two on each side of the mill center line) absorb the roll separating forces during rolling.
The screw posts have opposite hand threaded portions engageable with nuts carried by the chocks. Symmetrical roll parting adjustments are effected by simultaneously rotating all four screw posts.
There are several drawbacks associated with this type of arrangement. For example, insertion and removal of the work rolls and their respective chocks entails painstaking and precise alignment of coacting components, requiring the use of expensive specially designed robotic equipment.
Moreover, the multiple pairs of screw posts and the gear drives required to effect their simultaneous rotation adds significantly to the initial price of each roll stand.
Accordingly, a primary objective of the present invention is the provision of a housingless roll stand which has a simplified compact design, in which only two screw posts are required to effect symmetrical roll parting adjustments.
A companion objective of the present invention is to simplify the task of removing and inserting the work rolls, chocks and associated adjustment mechanisms, thus making it unnecessary to resort to the use of specially designed and expensive robotic equipment.
SUMMARY OF THE INVENTION
A roll stand in accordance with the present invention includes a support structure adapted to be fixed at a selected location along the mill center line. First and second work rolls are configured and arranged to roll products directed therebetween. The first work roll has its roll necks journalled for rotation in bearings contained in first chocks, and the second work roll has its roll necks likewise journalled for rotation in bearings contained in second chocks, with the first and second chocks being arranged in pairs on opposite sides of the mill center line.
The first and second chocks of each roll pair are connected to the support structure for pivotal movement respectively about parallel first and second connecting axes which extend in parallel relationship with respect to the roll axes and orthogonally with respect to the mill center line. An adjustment mechanism simultaneously pivots the first and second chocks of each pair in opposite directions about their respective connecting axes in order to symmetrically adjust roll parting.
Preferably, the adjustment mechanism comprises nut members carried by the first and second chocks of each pair, a pair of threaded posts, one post being associated with each chock pair and having opposite hand threaded portions engageable with the chock nuts, and a remotely operable gear drive for mechanically coupling and simultaneously rotating both threaded posts.
Advantageously, the rotational axes of the rolls lie in a first plane, the chock connecting axes lie in a second plane parallel to and on one side of the first plane, and the threaded posts are contained in a third plane also parallel to the first plane and on a side thereof opposite to that occupied the second reference plane.
Preferably, the support structure includes a pair of link members separably connected to a base, with the first and second chocks of each pair being interconnected by and pivotally connected to one of the link members, and with the rolls, chocks, link members and mechanically interconnected threaded posts being separable as an integral assembly from the base.
These and other objects, features and advantages of the present invention will now be described in greater detail with reference to the accompanying drawings, wherein:


REFERENCES:
patent: 1893196 (1933-01-01), Buck
patent: 1927304 (1933-09-01), Buck
patent: 4557130 (1985-12-01), Bond
patent: 4991420 (1991-02-01), Frischknecht et al.
patent: 5142896 (1992-09-01), Berger et al.
patent: 5875671 (1999-03-01), Hauck et al.
patent: 6065318 (1998-11-01), Maniwa et al.

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