Rolling mill

Details Rolling mill Rolling mill

1987-07-21

1989-03-21

Spruill, Robert L.

Metal deforming

By use of roller or roller-like tool-element

With carrier for roller-couple or tool-couple

72243, 72247, B21B 3118, B21B 3132

Patent

active

048132594

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to rolling mills having provision for applying roll bending forces to the work rolls of the mill.
It is known to apply bending forces to the bearing chock assemblies mounted at opposite ends of the work rolls of a mill by positioning fluid operated rams in parts of the mill housing which project into the mill window. These parts may be integral with the housing or may take the form of blocks which are secured to opposite walls of the housing. In these blocks, rams are located such that the piston of one ram projects from the top of the block and is engageable with the underside of a part of the bearing chock assembly on one roll and another piston projects from the underside of the block and bears against an upwardly disposed surface on the bearing chock assembly of the other roll. When the bearing chock assemblies are only free to move vertically towards and away from each other, there are no particular problems because the line of action of the rams is also vertical. In certain applications, however, it is desirable that the work rolls should be displaceable axially and, thus, in addition to moving vertically, the bearing chock assemblies at the ends of the work rolls must also be free to move axially of the roll thereby moving in the direction at right angles to the line of action of the fluid operated rams. This can result in damage being caused to the rams, particularly if an attempt is made to move the rolls axially while the rams are energised to apply bending forces to the rolls by way of the bearing chock assemblies.


SUMMARY OF THE INVENTION

It is an object of the present invention to overcome this difficulty.
The present invention resides in a rolling mill stand comprising a housing structure; a pair of horizontal work rolls arranged one above the other and each supported at their ends in bearing chock assemblies which are located in the housing structure; means for displacing the rolls in the direction of their length; roll bearing means for applying roll bending forces at the ends of the rolls, said roll bending means comprising hydraulic rams acting vertically between the housing structure and the bearing chock assemblies and wherein the outer end of each ram where it engages the bearing chock assembly is constituted by a rotatable body which permits relative movement between the ram and the bearing chock assembly in the direction of movement of the bearing chock assembly when the rolls are displaced in the direction of their length.
By making the outer end of each ram in the form of a rotatable body, the force is applied between the ram and the chock, even when there is relative axial movement between the chock and the block in which the ram is located. The axial movement causes the rotatable body to rotate in the housing in which it is located, the housing forming part of the piston of the ram.
The rotatably body is conveniently a sphere in the form of a steel ball which is partly located in a recess in the end of the piston and the ball projects through an aperture in a retaining cover fitted to the end of the piston.
In an alternative arrangement, a roller is pivotally mounted in the outer end of the ram with part of the periphery of the roller projecting beyond the housing which retains the roller in the piston. The axis of rotation of the roller is such as to readily enable the roller to rotate about this axis when there is relative movement between the roller and the chock against which it bears in the axial direction of the roll supported by the chock.
It is usual that in each block there are a pair of bending ram groups arranged symmetrically on opposite sides of the centre line of the bearing between the end of the work roll and the chock against which the bending groups abut. Each group may consist of a single ram or a pair of rams situated in side-by-side relation. When the roll, and hence, its bearing chock assembly is fixed relative to the rams, there are no particular difficulties so long as the ram groups are symmetrical wi

REFERENCES:
patent: 3307386 (1967-03-01), Ward et al.
patent: 3498098 (1970-03-01), Bournez et al.
patent: 3534577 (1970-10-01), Fernbach
patent: 3555872 (1971-01-01), Bournez et al.
patent: 4491005 (1985-01-01), Kimura et al.
patent: 4499748 (1985-02-01), Nihei et al.
patent: 4543810 (1985-10-01), Stoy et al.
patent: 4615202 (1986-10-01), Stoy et al.

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