International Journal of Electrical Machining
Online ISSN : 2188-5117
Print ISSN : 1341-7908
ISSN-L : 1341-7908
Paper
Surface Characteristics of Molding Die Treated by Electron Beam Irradiation
Yoshihito HAGIHARAMasaaki SANOAkira OKADA
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2019 Volume 24 Pages 13-20

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Abstract

In order to improve the thermal fatigue strength of EDMed molding dies, thermal fatigue tests of the treated surfaces by large-area electron beam (EB) under various conditions and gas nitriding were conducted. The thermal fatigue characteristics of the treated surface were evaluated by surface roughness measurement, microscopic observation, and X-ray residual stress measurement. These results indicate that the EB treatment has more dominant influence on the residual stress than pre-processing, such as EDM and milling, and the residual stress of EB treated surface is released in the early stage of the thermal fatigue test. Moreover, the gas nitriding treatment can inhibit the heat crack generation and its propagation on the surface in the thermal fatigue test.

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© 2019 by the Japan Society of Electrical Machining Engineers
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