Desenvolvimento de plano de manutenção para moldes de injeção de termoplásticos

Abstract

This study presents the development of a maintenance management methodology for thermoplastic injection molds in a household appliance manufacturing company. The objective was to establish a maintenance plan for injection molds in order to improve tool reliability, reduce unplanned failures, and enhance production process quality. Initially, a literature review was conducted covering preventive maintenance, reliability-centered maintenance, Total Productive Maintenance (TPM), and Failure Mode and Effects Analysis (FMEA). Subsequently, tools were developed for mold registration, criticality classification, failure history assessment, and reliability analysis through the calculation of Mean Time Between Failures (MTBF). The methodology was applied to a selected injection molding supplier, enabling the identification of failure modes related to component wear, extraction failures, leakage, misalignment, and corrosion. Based on the results obtained, a preventive maintenance plan was developed using mold criticality and reliability indicators, along with the proposal of an operational inspection form based on TPM principles. The results demonstrated that the proposed methodology provides a structured approach to mold maintenance management, offering objective criteria for maintenance scheduling and contributing to the reduction of corrective maintenance dependency.