Análisis de falla de los bujes del tornillo de una extrusora utilizada para procesar pintura en polvo

ABSTRACT This article aims to present the failure analysis of extruder screw bushings used for the manufacture of powder paint. Two bushings, one from the transition zone and one from the metering zone were selected to carry out the study. Chemical composition and microstructural analysis, hardness testing and a detailed analysis of the failed surfaces by visual examination and SEM were performed. The results showed that both bushings were made of steel DIN 1.2316 with a globular annealing heat treatment. Also, a nitride coating 45-65 μm thick with hardness greater than 1400 HV was identified...