Avaliação da influência de diferentes ferramentas de corte no microfresamento do aço ferramenta ABNT H13

Abstract

The development of new technologies has demanded the manufacturing of components with increasingly smaller dimensions and, to meet this demand, micromilling has been used. This process can be applied to different materials, including tool steels. ABNT H13 tool steel is commonly used in molds and dies for hot work. Given this scenario, the micromilling of H13 tool steel has been the object of study of different works, in order to analyze the phenomena involved and the quality of the process. However, there are still few researches on the influence of the tool in micromilling, since micromills directly impact the quality of the manufactured part as well as manufacturing costs. In this sense, the objective of this work is to analyze different tools in the micromilling of ABNT H13 tool steel. The work used flat end micromills with a diameter of 400 μm with different geometries and coatings. The experimental tests were performed on a precision CNC micromilling machine. In all tests, cutting fluid was applied in MQF regime and the cutting parameters were kept constant. Tool wear, machined surface roughness and burr formation were evaluated. There was a strong positive correlation between of the side-cutting edge angle and the end-cutting edge angle on tool wear and there was a negative correlation between the nose angle on tool wear. A strong positive correlation was also observed between the cutting-edge radius, the area of burrs formed and the roughness of the channel. The coating also had an influence on the output variables, but to a lesser extent.