Rolling mills

Details Rolling mills Rolling mills

1994-01-14

1995-12-12

Larson, Lowell A.

Metal deforming

By use of roller or roller-like tool-element

With cleaning or conditioning of tool, or lubrication of...

72 39, B21B 4504, B21B 2800

Patent

active

054739241

DESCRIPTION:

BRIEF SUMMARY
This invention relates to rolling mills and in particular to rolling mills for cold rolling aluminium strip.
The final rolling stages of aluminium strip consist of rolling the strip through a number of rolling mill stands, sometimes arranged in tandem, so that the strip leaving the last stand is of the required gauge. This strip is then coiled for subsequent use. The rolls of the mill stands are cooled by having liquid coolant applied to them on the entry side and it has been the practice to employ kerosene as the liquid coolant. However, for various reasons, it would be preferable to use water as the liquid coolant, but it is absolutely vital to keep water off the strip on the exit side of the mill when it is coiled because water left on the surface of the coiled strip dries and causes considerable staining of the strip rendering it unacceptable to many potential users.
Each of the mill stands consists of a pair of work rolls arranged one above the other and each work roll is backed up by a separate back-up roll. The liquid coolant is applied to both the work rolls and the back-up rolls on the entry side of the mill stands and steps are usually taken to contain the liquid coolant on the entry side of the stand and to limit, as far as possible, the movement of the liquid coolant to the surfaces of the rolls at the exit side of the stands in order to prevent moisture being deposited on the strip and which may eventually cause staining of the strip.
In practice, it has been found hat moisture may penetrate between the upper work roll and its back-up roll and collect in the cusp at the exit side of the mill between the upper work roll and its back-up roll. Furthermore, even if the liquid coolant applied to the back-up roll on the entry side is contained within a chamber which is sealed along its length to the periphery of the back-up roll, there may be some leakage through the seal between the chamber and the upper back-up roll and this permits some moisture to collect on the periphery of the upper back-up roll and be taken to the cusp between this roll and its work roll on the exit side.
It is an object of the present invention to provide a moisture extraction device for such a rolling mill by which moisture which collects at this cusp can be removed.
According to the present invention, for use with a rolling mill having a pair of work rolls each backed-up with the back-up roll, a moisture extraction means is characterised in that it comprises a head assembly shaped to enter into and extend along the length of the cusp between the upper work roll and its back-up roll on the exit side of the mill; an extractor system connected to the head assembly and including suction generating means by which, in use, air is sucked from the cusp through the head assembly into the extractor system whereby moisture present in the cusp is drawn with the air into the extractor system.
With a rolling mill fitted with a moisture extraction device in accordance with the present invention, moisture which may collect at the cusp between the upper work roll and its back-up roll at the exit side of the mill is removed so that it cannot fall on to the upper surface of the strip material where, if it is water and the strip is aluminium, it could bring about staining of the material.
The extractor system includes ducting which connects the head assembly with suction generating means and the ducting has quick-release joints at its connections to the head assembly and suction generating means. The quick-release joints may be operated simultaneously. This arrangement of the ducting and the quick-release joints is particularly convenient if the head assembly is supported from the bearing chocks of the upper work roll so that, when the work roll is to be replaced, the head assembly is removed with the work roll and its chocks. To enable quick-release and re-connection of the joints, the release joints between the ducting and the head assembly and the suction generating means can be released simultaneously, the roll changed and the connections

REFERENCES:
patent: 4061010 (1977-12-01), Stock et al.
patent: 4718264 (1988-01-01), Guppy et al.
patent: 5046347 (1991-09-01), Crosato et al.
patent: 5081857 (1992-01-01), Matsui et al.

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