低消耗放電加工領域における被加工物への局部熱入力

抄録

In EDM, the pulse duration τ which minimize the electrode wear ratio γ (=tool electrode erosion/workpiece erosion) are above 100μs. In that case, the workpiece is negative electrode.
The present investigation is an exploration of the cathode heat input on the surface of the workpiece given by a single pulse discharge under these conditions of pulse duration τ. The use of the equivalent heat input radius [a] to calculate the local molten zone on the surface of work metal (cathode) makes a special feature of the present investigation. The equivalent heat input radius [a] instead of the cathode spot radius which changes every moment was determined as a semi-experimental equation by using the theoretical equation of thermal conduction. The radius [a] with a general idea such as the effective value in the alternative current of electrical engineering is nonexistant.
As the result, It became evident that the heat input to the cathode (work piece) spot can be treated for the constant value in a single pulse discharge which is provided by both the current I and the pulse duration τ. These results agree well with other reports, in which the cause have not been explained. In other words, it was explained by using the equivalent heat input radius [a] that the heat input to the cathode spot on the workpiece can be treated by a constant during a single pulse discharge.
And also, it is conclude that Joule heating can by almost ignored on experimental conditions in the present paper.