| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Research Abstract |
This research deals with simulation of workpiece geometry eroded by a die-sinking EDM using a newly developed simulation algorithm for faithful imitation of the actual phenomena which are occurring in the gap. The algorithm is a simple repetition of the procedure which is comprised of : 1. determining the next discharge location where the dielectric breakdown strength is lowest, 2. removing the tool and workpiece electrodes, 3. distributing the debris particles, and 4. feeding the tool electrode. The simulation takes into account a variety of influential factors such as tool electrode wear, gap width distribution, curvature and inclination of the tool electrode, and debris particle concentration, all of which affect each other in a very complex manner. The simulation results for the geometries of the tool electrode and the workpiece after machining and for the gap width distribution agree well with the experimental results for machining of a flat and square surface.
Another aim of this research is to develop a simulation method to solve the inverse problem in which the tool elctrode shape to achieve the final shape of the workpiece can be obtained. In this inverse simulation, the same algotithm as used in the forward simulation which is described above is used considering the initial shapes of the workpiece and tool electrode as equal to their final shapes in the forward simulation. Moreover, the workpiece is fed in the opposite direction toward the tool electrode, and the data concerning the removal volumes per pulse discharge pertaining to the tool electrode and workpiece, respectively, are exchanged each other. As result of the inverse simulation, the shapes of the tool electrode and workpiece were restored to the initial shapes in the forward simulation.
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