2021 年 26 巻 p. 16-
To achieve high-speed machining of sintered carbide, a new process of milling using an electrochemical reaction is proposed. In this report, the principle of this method and its effectiveness were confirmed. First, the phenomena on the sintered carbide surface occurring in the electrochemical reaction were investigated. The reactions that could occur on the sintered carbide surface are the elution of Co, the oxidation of Co, and the oxidation of WC. It was found that the elution of Co occurs first, followed by the oxidation of WC. Then, the cutting resistance and the machining phenomena were evaluated and compared in the cases with and without the electrochemical reaction. It was shown that the cutting resistance becomes significantly lower when the electrochemical reaction occurs. The analysis results showed that the reason for the reduction in cutting resistance was the elution of Co and that most of the electric charge was used for the elution of Co, not the oxidation of Co and WC, when machining was carried out under certain conditions.
