ABSTRACT
The rolling operation consists of passing metal stock between two counter-rotating rollers. Providing that the gap between them is suitably less than the thickness of the incoming stock, the rolls will grip the material and deliver it at a different area of cross-section. The difference between the entry and delivery cross-sections when expressed as a percentage of the incoming section is known as the ‘reduction’. A typical mill stand consists of two box-shaped mill housings bolted across two bed plates. The separation between the housings is maintained by tiebars. The top plate is sometimes common to both housings. Lubrication of mill rolls is essential if high surface quality products are to be produced without heavy damage to the rolls themselves. Steel is a much tougher material to deform than most of the common non-ferrous metals. The severity of this operation normally requires the use of lubricant with more efficient coolant properties.
