电火花微小孔加工工艺参数的优化研究

STUDY ON THE OPTIMIZATION FOR ELECTRICAL DISCHARGE MACHINING MICRO AND SMALL HOLE

由于目前对电火花放电机理认识的有限性而使参数优化成为电火花加工中的难点之一,特别是多项工艺指标要求下的参数优化问题更是缺乏理论指导和具体应用方法。因此,在用正交试验法研究了电火花微小孔加工中放电参数和非放电参数对加工速度、电极损耗和孔径间隙等各单项工艺指标的影响规律的基础上,采用灰色相关性理论,重点解决了多项工艺指标下的参数优化这一难点问题,简化了优化过程,得出了优化的参数组合方案。

The optimization of parameter values in electrical discharge machining(EDM) has become one of the big prob- lems in non-traditional manufacturing field, especially the optimization of EDM parameter values with multiple performance characteristics due to the reason that the knowledge of EDM mechanism acquired has still been much limited until now. On such an occasion, a new theory or method ought to be created or utilized from the interdisciplinary approaches. The grey relational grade theory .therefore, is employed to optimize the parameter values with multiple performance characteristics on the basis of the experimental results with orthogonal array. The paper also makes a detailed analysis of the effects of different electrical parameter values and non-electrical parameter values on such performance characteristics as machining speed, electrode consumption and hole clearance. As a result, the optimized parameter values are obtained through the simplified procedure by applying grey relational grade into the optimization of parameter values with multiple performance characteristics.