Abstract
A new apparatus for measuring stress distribution and dynamic friction coefficient in cold rolling of aluminium plates was made by the authors. It consists of a small tungsten pin which is set along the radius direction of the under roll, and a wire strain gauge which changes with deformation of the small pin. The wire strain gauge is sufficiently sensitive even to a small load, as the bobbin of gauge is made of cloth-bakelite.With the apparatus a series of experiments was carried out to clarify rolling stress distribution, stick-slip and dynamic friction coefficient in cold rolling of aluminium plates.The results are as follows: Many slips exist in cold rolling of aluminium plates; generally, curves between rolling stress and angle of contact part are of bell-type, and the maximum rolling stress increases proportionally to an increase of rolling reduction ratio; and dynamic friction coefficients are calculated at the neutral point, and the coefficient increases with an increase of rolling reduction ratio, too.
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