STUDY OF STRESS-STRAIN STATE OF ROLLS-BAND SYSTEM AT ROLLING OF BROAD-FLANGED BEAM IN STANDS OF UNIVERSAL BEAM MILL. REPORT 2

Abstract

The  article  outlines  the  methodology  and  results  of  solving  the  task  of measuring  the  temperature  field  and  the  thermoelastic  stress  in  the  horizontal  rolls  in  the  process  of  rolling  of  a broad-flanged beam  in  the universal beam mill  stand. The  authorsets and solves  the problem of measuring  the  temperature field of the composite rolls. The author discloses the algorithm of measuring  the  thermoelastic stress  in  the horizontal rolls with  the known temperature field. The article contains distribution diagrams of the tangential  thermoelastic  stress  in  the cross  section of a horizontal roll in the process of rolling beams in the universal mill stand. The author shows  the effect of  the heat emission factor on  the  level of the tangential stress in cooling the rolls with water. The theoretical research determines the value of the tensile tangential stress which lowers  the  endurance  of  the  horizontal  rolls  of  the  universal mill stand. The article determines  the  resultant stress  field  in  the horizontal composite rolls caused by the rolling pressure and the cyclic thermal effect with  the   residual stress  taken  into account. The author provides  recommendations how  to  increase  the  endurance of the composite rolls of the universal beam mill.