功能电极电火花诱导烧蚀及磨削辅助复合加工研究

发布时间：2018-03-08 01:32

本文选题：电火花　切入点：烧蚀加工　出处：《南京航空航天大学》2016年硕士论文　论文类型：学位论文

【摘要】：功能电极烧蚀加工是将氧气和工作液(水)的混合介质通入到电火花加工间隙中,利用电火花释放的能量引燃工件材料,使之与氧气燃烧,提高能量去除率。但是由于烧蚀加工能量较大,在工件表面生成巨大的烧蚀坑和氧化产物,工件表面极差,影响烧蚀加工效率进一步提升。为了解决功能电极电火花诱导烧蚀加工方法在提高电火花加工效率时对工件表面造成的损伤,本文提出了功能电极电火花诱导烧蚀及磨削辅助复合加工技术,在烧蚀加工中对工件进行在线修整。机械磨削作用能将烧蚀加工中生成的表面氧化物去除,一是能避免氧化层对烧蚀加工的阻碍,提高加工效率;二是能提高烧蚀加工中的工件表面质量。具体研究工作如下。(1)为实现功能电极烧蚀加工与机械磨削加工的复合目标,本文基于烧蚀加工系统设计了功能电极电火花诱导烧蚀及磨削辅助复合高效加工系统,实现烧蚀加工和机械磨削加工的复合。(2)通过对气体介质和液体介质电火花放电机理过程的比较以及对烧蚀加工中燃烧反应的诱发和传播机理的分析,深入研究了气液混合工作介质烧蚀加工的机理过程,认为其机理过程包括混合介质的电离击穿分析,燃烧反应的诱发机理和传播过程,烧蚀生成物的排出。(3)通过电火花诱导烧蚀加工和磨削修整复合加工实验的对比分析,复合加工方法无论是加工效率还是表面质量都有明显优势,试验加工中分析了机械磨削作用对加工过程中材料去除率、表面质量以及极间放电过程的影响机理。(4)通过改变加工参数(电参数、非电参数)的方法进行了工艺试验,研究了加工参数对功能电极电火花诱导烧蚀磨削修整高效加工方法加工效率和表面质量的影响规律。
[Abstract]:The function electrode ablation process is to put the mixed medium of oxygen and working fluid (water) into the gap of EDM, and use the energy released by EDM to ignite the workpiece material and make it burn with oxygen. But because of the large ablation energy, there are huge ablation pits and oxidation products on the surface of the workpiece, and the surface of the workpiece is extremely poor. In order to solve the damage to the workpiece surface caused by the EDM method in improving the efficiency of EDM, In this paper, the technology of functional electrode EDM induced ablation and grinding assisted composite machining is put forward, in which the workpiece is trimmed on line. The surface oxide produced in ablative machining can be removed by mechanical grinding. First, it can avoid the hindrance of the oxide layer to the ablative machining and improve the processing efficiency; second, it can improve the surface quality of the workpiece in the ablative machining. The specific research work is as follows: 1) in order to realize the composite goal of functional electrode ablation and mechanical grinding, Based on the ablative machining system, a functional electrode EDM induced ablation and grinding assisted composite high efficiency machining system is designed in this paper. By comparing the mechanism of electric spark discharge between gas and liquid medium, and analyzing the induction and propagation mechanism of combustion reaction in ablation machining, The mechanism of ablation of gas-liquid mixed working medium is studied in depth. The mechanism includes ionization breakdown analysis of mixed medium, induction mechanism and propagation process of combustion reaction. Through the comparative analysis of the experiments of EDM and Grinding dressing composite machining, the composite machining method has obvious advantages in both machining efficiency and surface quality. The effect of mechanical grinding on material removal rate, surface quality and inter-pole discharge process was analyzed. The process tests were carried out by changing machining parameters (electrical parameters, non-electrical parameters). The effect of machining parameters on the machining efficiency and surface quality of the functional electrode EDM grinding method was studied.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG65

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