Abstract
In the three dimensional EDM, it is neccesary to make appropriate compensation for electrode wear. In the previous report, it was proved that the machining can be progressed with keeping the shape of the worn electrode almost constant by using the automatic measure-compensating method for electrode wear length. Followed from the previous report, this report describes some experiments of estimate-compensating method without the measuring movement. From the results the following became clear mainly. (1) The electrode wear characteristics on flat-bottomed shape forming are able to be expressed numerically by parameters of the wear beginning point and the slope of the tangent to the characteristic curve of the electrode wear length. And by these data, it is possible to perform the estimate-compensating machining. (2) In this method, it is neccesary to set the slope of the tangent to the curve and appropriate compensating distance as the data into the machining program and also is neccesary to establish the beginning point of the compensating movement. (3) The slope of the tangent to the curve changes according to the shape of electrode at every moment but by continuation of this machining the shape of worn electrode is settled almost constant.
