Análise da influência da tolerância dimensional nos valores de energia absorvida durante o ensaio de impacto mini Charpy.

Abstract

Electrical Discharge Machining is a non-conventional manufacturing process that has been widespread in the worldwide industry. In addition to the complex geometry parts workability, this machining process is indicated to the cutting materials of high hardness, which are not easily machined by other methods. The absence of shear force and the fast heat dissipation are two of the main characteristics of this process, which is capable of producing a high quality final product. EDM is highly recommended to the manufacture of Charpy test specimens, particularly for mini-size Charpy. However, some issues need to be clarified. This work investigates the influence of dimensional tolerance allowed in the project on the energy absorbed by the specimens during the mini-size Charpy test. The specimens base dimension is 1.5 mm x 1.5 mm with ± 1 mm tolerance. Several samples of the P110 material were tested, which were machined by wire-EDM and had their dimensions ranging within the tolerance allowed. Subsequently, a statistical treatment was performed to guarantee the reliability of the results. Finally, this work shows by Variance Analysis that there is a dimensional tolerance influenced on the result of the mini-size charpy impact test in some cases.