Comparação entre ferramentas de metal duro de classes diferentes para fresamento de aço AISI H13

Abstract

Nowadays, in the production of molds and dies in Brazil, more than half of the final value of the production is related to machining costs and only a small part is related to the materials. Following a trend of increasing investments in modernization, industries seek to improve their production processes to remain competitive in the market. This paper aims to propose a more cost-effective alternative to the process of machining a die by comparative analysis between the tool that is currently being used in the process in relation to a new proposed tool. Both tools have the same diameter, 6 millimiters and were used under the same machining conditions. The tools differ, such as the grade of carbide in which they were manufactured and their coating. They also differ in their recommendation for use: the current tool is recommended for general machining, while the tool being proposed in this work is designed by the manufacturer for machining hardened steels at high cutting speeds. The tests were performed using a hardened H13 steel specimen to 55 HRc. The tools were analyzed at 20-minute machining intervals to a total time of 60 minutes. The criteria taken into consideration were tool wear and the roughness of the machined material, evaluated using a microscope and roughness meter respectively. At the end of the tests comparisons were made which showed a big difference between the tested tools in relation to their wear and the resulting textures on the specimen surface. It was observed that the proposed tool in this work showed great superiority in relation to the wear and also in the superficial roughness (sic).