中文摘要：

在用微细电火花加工大深径比微孔的过程中发现,相同加工条件下工具电极越长则加工孔径越大.为了解释这一现象,采用经典Bernoulli-Euler杆件理论,针对加工作用力对电极变形影响的3种情况,对工具电极的变形量进行了求解,结果表明计算值与实验结果非常接近,从理论上揭示了加工作用力对微孔加工过程的影响.加工中随电极长度的增加,加工作用力使其弯曲变形随之增大,从而导致同一直径的电极在长度不同时加工出的孔径不等.

英文摘要：

The diameter of micro-hole varies proportionally with the length of electrode when a micro-hole with high aspect ratio is drilled by micro-electrical discharge machining（EDM） even under the same machining conditions.To explain this phenomenon,the theory of classic Bernoulli-Euler rod is used to study the relationship between the reaction force during micro-hole drilling by micro-EDM and the deflection of electrode under three reaction force conditions.Theoretical values are very close to experimental results.It is clarified that the bending of an electrode increases with an increase of the electrode length,resulting in different diameters of micro-holes using the same diameter of electrode but in different lengths.