提出微细电火花加工过程中的微尺度效应。建立单脉冲火花放电的非傅里叶热传导模型，深入研究微尺度放电加工条件下的脉冲式非平衡态热传导过程，揭示微细电火花加工的尺度效应形成原因；建立完整的微细电火花加工过程中的尺度效应理论；分析各加工工艺参数和材料微结构性能与尺度效应之间的关系，研究尺度效应对加工工件形状尺寸精度和表面光洁度影响的内在规律；探索有效控制被加工件尺寸精度和表面质量的方法，实现对微细电火花加工技术的精确控制。 微细电火花加工技术是十分有效的微细加工技术，成为近几年研究热点。由于受尺度效应的制约，加工工件的形状尺寸精度和表面质量的控制一直未取得突破，严重制约着微细电火花技术的实际应用。研究微细电火花加工的微尺度效应，对于揭示其影响机理，有效控制放电加工精度，促进该加工技术实际应用具有深远的意义。其研究开发成功将引起微细电火花加工技术的巨大变革,经济和社会效益显著。

Micro size effect in micro EDM is proposed. Non-Fourier heat conduction model of single pulse discharge will be developed and the reasons why the size effects can be generated in micro-EDM will be revealed through deep study on the process of pulsed non-equilibrium heat conduction in micro-EDM. An integrated theory system for the size effect in micro-EDM will be developed. The influence of each processing parameter, microstructure and microscopic properties on the size effect will be analyzed; The inherent influence of the size effect on the accurancy in shape and size and the quality of finished surface of the workpieces will be researched; The new effective methods to control the accurancy in shape and size and the quality of finished surface of the workpieces will be explored, and then a micro-EDM process with a good accurancy controlling will be realised. Micro-EDM is one of the most effective micro machining technology and it has become the research hot topic in recent years. Being constrained by the size effect, breakthrough in the controlling of precision in shape and size and quality of finished surface has not been made. The practical application of micro-EDM has not been realized due to the restraint of the size effect. There are profound significances to do research on the size effects in micro-EDM. It is helpful to reveal the influence mechanism of the size effect, control the accurancy of Micro-EDM effectively and promote the application of micro-EDM in practice. The bold changes in micro-EDM technology can be brought about due to the successive research of the size effect in micro-EDM. There is a great deal of economic and social benefits.