engleski

Stress-time History of Rolls with Grooves

In “Steelworks Split” failures of the rolls with grooves on the 3-high-roughing mill stand occurred four times. One part of the failure analysis is an investigation of the service load and corresponding stresses. Numerical analysis of the local stresses revealed maximum stresses on the caliber 7a and on the roll neck. In this paper is presented determination of stress time history and stress spectrum for two critical points of the roll. Stress time histories and stress spectra are obtained from the experimental determined rolling forces, stress numerical analysis and pass schedule. Stress spectra comparison shown that caliber 7a is more sensitive on the fatigue stress and possible fatigue cracks then roll neck what is corresponding with occurred failures.

rolling; rolls with grooves; stress-time history

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