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Finite Element Analysis of Thermal Stresses on a Hearth Roll Surface Depending on Changes in the Neck Shape

허스롤 목 부위 형상 변화에 따른 열응력 분포 변화 유한요소해석

Na, D.H.;Lee, Y.
나두현;이영석

  • Received : 2016.02.11
  • Accepted : 2016.05.02
  • Published : 2016.06.01

Abstract

The hearth roll, which transfers the cold-rolled strip sheet in a Continuous Annealing Line (CAL), is always subjected to changes in the surface temperature and subsequently experiences thermal stress in service. These variations lead to the generation of thermal cracks on the hearth roll surface as well local plastic deformation. We performed finite element analysis to predict the thermal stress changes on the hearth roll surface and designed the collar shape of the hearth roll to minimize these thermal stresses. Results show that the hearth roll with a collar having an obtuse angle is much more effective than a hearth roll with collar having a right angle when the tangential stress, which is one of main causes leading to surface cracks, is compared for the various conditions. It was found that the tangential stress and the temperature on the surface of hearth roll can be reduced by 51.9% and 26℃ if the shape of roll on collar is re-designed.

Keywords

Continuous Annealing Line;Hearth Roll;Thermal Stress;Finite Element Analysis