Abstract
Some form of lubrication is required at each stage in the rolling of strip in copper and its alloys. In the finishing operations the problem is complicated by the need to produce a clean, stain-free surface, which imposes severe limitations on the types of lubricants and additives that can be used. This paper briefly reviews the reasons for lubrication during rolling and then discusses the qualities required in the lubricants, how near the precise requirements can be achieved in practice, and the limitations which currently available lubricants place on the processes.
Hot rolling and cold breaking down give little trouble, but intermediate and finish rolling are more critical; the types of both oil-in-water emulsions and neat oils needed are dealt with in some detail for slow-and highspeed mills. The problem of contamination of the rolling lubricant by the oils and greases used as mill lubricants and in mill hydraulic systems is considered and suggestions are presented for minimizing the trouble by the use of special lubricants and modern methods of lubrication, including the latest practices on cluster-type Sendzimir mills.
The design of roll coolant systems for modern high-speed four-high strip mills and cluster-type Sendzimir mills is discussed, in so far as it affects the lubricant and strip finish. The paper concludes with a brief review of the problems posed by the latest development of the pendulum mill and their possible solutions.
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