A COVER ROLLS OF RIBBON CONVEYOR DESIGN WITH STRESS CONCENTRATION MINIMIZATION AS A

The main goal in this paper is defining the optimal geometry of the cover rolls of ribbon conveyor. The basic criteria for optimization this geometry is minimization the stress concentration as a reason for beginning the micro crack in some zones of the steel sheet cover rolls. Using FEM analysis of the existing constructive solution, it finds some zones with huge stress concentrations. In that zones, it's officially start some micro cracks with very progressive expanding in the period of deep drawing of sheet metal. That situation produced a lot of failure examples of the cover rolls with a huge negative impact of the economical efficiency of the company. With reshaping the geometry of the cover rolls, especially on the zones with a huge stress concentration, using FEM analysis again is given a new, better constructive solution of the cover rolls construction with significantly decreasing the stress concentration and avoidance the possibilities of beginning the micro crack in dangerous zones. The results of the practical implementation of a new constructive solution shows significantly improvement in stress domain without failure in the process of deep drawing of sheet metal.