Analise estrutural, operacional e geométrica para o reprojeto do eixo da calibração de uma formadora de tubos

Abstract

This work carried out at Panatlântica Tubos SA addresses the increase in the number of traction shaft breaks in the forming of a pipe maker and implements solutions to increase its service life. The flexural and torque acting loads on the axle were calculated where it was concluded that it should not break within a period of two months, the geometry was analyzed and modified in order to increase its useful life and the recalculated stresses to analyze the gain in its mechanical resistance. Parallel to this were analyzed and corrected operating errors in the machine and setup that compromised the proper operation of the shaft. Hardness analysis was performed where a serious heat treatment failure was detected. Finally, it was concluded that there were several causes that contributed to the drop in shaft life, with operational problems in welding the strips and excess strips in the accumulator, setup done incorrectly with missing parts in the assembly and bearings outside position and heat treatment leaving a lower hardness in the break region. As a result a 28.57% increase in safety factor was obtained, corrected operational, setup and heat treatment failures and the axis in the most critical formation pass had no break in 5 months of monitoring (sic).