高频窄脉冲电解加工的机理研究

探讨了高频窄脉冲电解加工（HSPECM）的机理。结果表明：HSPECM的强脉冲效应,改善了电解加工极间的间隙特性;强压力波,大脉冲间反向电流以及微火花均产生强烈的去极化作用,改善了电流效率特性,缩小了加工截止间隙,这些均强化了阳极溶解的集中蚀除能力,并实现了微小间隙加工。工艺试验证明,上述变化可导致高加工精度,高表面质量和高效率。用HSPECM加工的型腔试件其圆度达到0.02mm,重复精度在0.05mm以内,表面粗糙度在Ra0.60μm以下,使电解加工从半精加工水平提高到了精加工水平。

The Investigation of the Mechanism of High Frequency Short Pulse Electrochemical Machining

In this paper, the mechanism of high frequency short pulse electrochemical machining (HSPECM) is investigated. The results show that the intensive pulse effects by HSPECM improve the behaviour of the inter_electrode gap of electrochemical machining (ECM). The intensive pressure wave, the large inverse current in pulse interval and microsparks all result in intensive depolarisation, so the current efficiency feature is improved and the cut_off gap is shortened. These lead to intensive anodic dissolution localisation ability and micro inter_electrode gap machining. It has been proved by technology experiments that the above alternations result in high machining accuracy, better surface quality and good profit. [JP2]For example, in die_sinking samples by HSPECM, ellipticity attains to 0.02 mm[JP], repeatability to 0.05 mm, surface roughness to Ra 0.60 μm. It improves ECM from semi_rough machining to precision machining.