發(fā)布時(shí)間：2018-03-08 01:32

  本文選題：電火花　切入點(diǎn)：燒蝕加工　出處：《南京航空航天大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：功能電極燒蝕加工是將氧氣和工作液(水)的混合介質(zhì)通入到電火花加工間隙中,利用電火花釋放的能量引燃工件材料,使之與氧氣燃燒,提高能量去除率。但是由于燒蝕加工能量較大,在工件表面生成巨大的燒蝕坑和氧化產(chǎn)物,工件表面極差,影響燒蝕加工效率進(jìn)一步提升。為了解決功能電極電火花誘導(dǎo)燒蝕加工方法在提高電火花加工效率時(shí)對工件表面造成的損傷,本文提出了功能電極電火花誘導(dǎo)燒蝕及磨削輔助復(fù)合加工技術(shù),在燒蝕加工中對工件進(jìn)行在線修整。機(jī)械磨削作用能將燒蝕加工中生成的表面氧化物去除,一是能避免氧化層對燒蝕加工的阻礙,提高加工效率;二是能提高燒蝕加工中的工件表面質(zhì)量。具體研究工作如下。(1)為實(shí)現(xiàn)功能電極燒蝕加工與機(jī)械磨削加工的復(fù)合目標(biāo),本文基于燒蝕加工系統(tǒng)設(shè)計(jì)了功能電極電火花誘導(dǎo)燒蝕及磨削輔助復(fù)合高效加工系統(tǒng),實(shí)現(xiàn)燒蝕加工和機(jī)械磨削加工的復(fù)合。(2)通過對氣體介質(zhì)和液體介質(zhì)電火花放電機(jī)理過程的比較以及對燒蝕加工中燃燒反應(yīng)的誘發(fā)和傳播機(jī)理的分析,深入研究了氣液混合工作介質(zhì)燒蝕加工的機(jī)理過程,認(rèn)為其機(jī)理過程包括混合介質(zhì)的電離擊穿分析,燃燒反應(yīng)的誘發(fā)機(jī)理和傳播過程,燒蝕生成物的排出。(3)通過電火花誘導(dǎo)燒蝕加工和磨削修整復(fù)合加工實(shí)驗(yàn)的對比分析,復(fù)合加工方法無論是加工效率還是表面質(zhì)量都有明顯優(yōu)勢,試驗(yàn)加工中分析了機(jī)械磨削作用對加工過程中材料去除率、表面質(zhì)量以及極間放電過程的影響機(jī)理。(4)通過改變加工參數(shù)(電參數(shù)、非電參數(shù))的方法進(jìn)行了工藝試驗(yàn),研究了加工參數(shù)對功能電極電火花誘導(dǎo)燒蝕磨削修整高效加工方法加工效率和表面質(zhì)量的影響規(guī)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.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG65

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