USE OF A VC ROLL IN A 4-HIGH COLD-ROLLING REVERSING MILL - EXPERIENCEAND OPERATIONAL RESULTS

The production trials showed that the shrink fit of the sleeve transmi ts, slip-free, not only the dynamic loads resulting from the rolling f orce; but also very high torques. During rolling it is possible to adj ust the crown of the VC roll as a function of the inner oil pressure. The installation of the VC roll does not require any modifications to the roll housing. The series of trials demonstrated that the effects o f work roll bending and VC roll on strip flatness suitably complement one another, as is documented by the measurement of the tensile stress distribution. It has thus been possible to reduce the frequency of wo rk roll crown grinding by two-thirds. The frequency of strip breakage has also been reduced. Furthermore, rolling performances have been inc reased and strip flatness improved.