Abstract
Titanium is frequently used in medical instruments. Medical instruments have complicated shapes and it is desirable to machine them by electrical discharge machining. However usually the EDM (except WEDM) of titanium is not stable, and medical instruments should not be contaminated by the tool electrode material during EDM. In this paper, we describe EDM test results of titanium in dielectrics of oil and water using a tool electrode of copper and titanium. A titanium tool electrode is used to avoid contamination of the titanium workpiece. Test results show that the EDM of titanium using the copper tool electrode in the water is more stable than in the oil, and has a low electrode wear ratio. Analyzed results on the copper tool electrode surface show that the reason for the low electrode wear ratio of the copper electrode in water is the adhesion of titanium transferred from the workpiece. The EDM of titanium using the titanium tool electrode in water has a 10% electrode wear ratio and is possible to use in machining of medical instruments.
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