Análise dos desgastes de ferramenta de metal duro no processo de torneamento do aço inoxidável CF8M (316)

Abstract

In this work, we sought to analyze, evaluate and understand the types of wear in coated carbide tools in the CF8M austenitic stainless steel turning process. With technological advances in the industry, new tools were developed in order to provide improvement in production. The premature wear of the tools causes loss of production due to insert changes and significant losses in the quality of the parts. Therefore, there is an ever-increasing search for understanding the wear mechanisms of tools in order to apply them correctly, ensuring the continuous improvement of the machining processes. In the factory's production environment, machining experiments of three different classes of carbide inserts were carried out. The cutting parameters and the batch of parts were established according to catalogs and pre-tests, being equally applied to all tools. Subsequently, the wear of the tools was evaluated under an optical microscope, seeking to find the most efficient. The predominant wears were flank wear, caused by the abrasion mechanism, and the adhesion mechanism.The AC5025S grade presents accentuated flank wear in one of the samples, due to the characteristics of the microcast material of the piece, which has porosity. AC6030M class tools obtained the highest VBMáx values due to the occurrence of high abrasion rate. The AC6040M class presented a constant behavior in the two tested samples, resulting in the lowest VBMáx values among the three analyzed classes. [resumo fornecido pelo autor]