Abstract
The method of optimum control has been investigated for the first step of a development of EDM automatic system. An aim of this optimum control is to obtain the maximum metal removal rate.The effective pulse efficiency was used as index performance of EDM process. A good correlation between the metal removal rate and effective pulse efficiency has been verified experimentally under the constant pulse duration and peak discharge current.The control parameters are (1) working voltage (servo referance voltage), (2) pulse duty factor, (3) electrode lifting cycle time, (4) dielectric pressure. An algorithm for controling four parameters was determined by experimental design method using the table of arthogonal arrays.The optimum control using established algorithm achieves more metal removal rate than manual operation by a skillfull operator.
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