Estudo do comportamento térmico e mecânico de uma matriz de injetora confeccionada com aço ferramenta H13 e VND

Abstract

An injection mold can be exemplified by a set of functional systems, allowing the part to be molded, in a space delimited by the cavity, to be filled in conditions controlled by other systems that prove the dimensional and structural quality of the parts produced. For the correct selection of the material for a given applicability, it is necessary to test the mechanical properties of the H13 and VND materials, before and after the heat treatment. Thus, the selected steels were submitted to hardness and traction tests. In this way, making a better comparison to carry out the selection of the most suitable for the design of the molds. The quench heat treatment is used in order to give greater hardness to the material and longer useful life to the tool, and consists of heating the steel in an oven with a temperature above the critical zone, remaining at that temperature for the time necessary to transform it into austenite and then immersed in water or oil. This treatment, in addition to increasing hardness, allows for increased yield strength, tensile, compression and wear resistance. For this purpose, samples of H13 and VND steels were submitted to tempering treatment. The hardness and traction tests were carried out in sequence for better comparison and thus choosing the most applicable for mold construction. The comparative study of the mechanical properties of the VND and H13 materials, in order to select the most suitable one for the design of an injection mold, was effective, after the end of this study, the VND tool steel proved to be more efficient for the suggested application