Abstract
Electric discharge machining (EDM) is a very effective working process in die making. The surfaces formed by EDM were presented with an eroded layer which cause a large influences on the quality or accuracy for the hot die steel. The residual stress at the surface of hot die steel after EDM has been measured, using X-ray diffraction method. The results obtained can be summarized as follows; (1) The residual tensile stress decreased gradually with increasing in depth below the surface for the annealed SKD61 sample. (2) Stress distribution curves of the quenched and tempered SKD61 sample were different from those of the annealed SKD61 sample. The compressive stress was often found at the surface of the quenched and tempered SKD61 sample. The peaks of the tensile stress were found for below the surface. (3) It was shown that the stress affecting range increased with increasing in the energy supplying duration (τon) from 50 to 1200μs.
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