本文選題：電火花加工 + 霧化燒蝕��； 參考：《南京航空航天大學》2017年碩士論文

【摘要】：目前,電火花加工是難加工材料加工的一種主要方法,但是其加工能量受制于脈沖電源,蝕除效率很低。電火花誘導燒蝕是一種新出現(xiàn)的針對難加工材料加工的方法,利用電火花誘導工件活化,并利用氧氣與活化區(qū)域發(fā)生燃燒反應快速蝕除材料,效率得到很大地提高。但是燒蝕反應產(chǎn)生大量氧化物附著在加工表面,無法排出,影響后續(xù)放電,從而影響加工效率。為此,本文提出采用燒結金剛石材料作為電極,利用金剛石顆粒在線磨除修整氧化層,促使燒蝕反應持續(xù)高效進行。本文從以下幾個方面進行了系統(tǒng)的研究:(1)提出了燒結金剛石電極霧化燒蝕磨削復合加工方法,構建了試驗系統(tǒng)�，F(xiàn)階段的沖液霧化燒蝕加工會使得反應區(qū)域產(chǎn)生氧化層,其電阻率較高,且不易燃燒。采用燒結金剛石電極,電極金屬部分放電參與霧化燒蝕,金剛石磨粒在線修整氧化層,保證燒蝕反應高效持續(xù)進行。(2)提出了壓力作為檢測信號的伺服控制方法,設計并搭建了整個系統(tǒng)。具體包括壓力采集,信號處理,伺服驅(qū)動以及基于LabVIEW的實時采集和監(jiān)測試驗數(shù)據(jù)的串口通信。實現(xiàn)了PID控制方法,模糊控制方法和反比例控制方法,并進行了對比實驗。(3)建立了研究霧化燒蝕磨削復合加工模型。研究發(fā)現(xiàn)復合加工過程分為放電誘導,高效燒蝕,磨粒磨削,電極修整四個階段。(4)開展了模具鋼和高強鋼的工藝優(yōu)化試驗。并研究了相關參數(shù)(峰值電流、脈沖寬度、脈沖間隔、電極轉(zhuǎn)速)對霧化燒蝕磨削復合加工特性的影響規(guī)律。對于模具鋼,復合加工方法能夠進行高效穩(wěn)定加工,效率是銅電極電火花加工的6.3倍;相比于銅電極的燒蝕加工,效率提升了88%。對于高強鋼,復合加工的效率是霧化燒蝕的1.3倍,且復合加工的表面質(zhì)量要明顯好于霧化燒蝕加工的表面。
[Abstract]:At present, EDM is one of the main methods for machining refractory materials, but its processing energy is limited by pulse power supply, and the efficiency of etching is very low. EDM ablation is a new method for machining refractory materials. The efficiency is greatly improved by using EDM to induce the activation of workpieces and to rapidly erode the materials by combustion reaction between oxygen and activation region. However, the ablation reaction produces a large number of oxides attached to the machined surface, which can not be discharged, which affects the subsequent discharge, thus affecting the processing efficiency. In this paper, sintered diamond material is used as electrode, diamond particles are used to grind the oxide layer online, and the ablation reaction is carried out continuously and efficiently. In this paper, a systematic study on the following aspects has been carried out. (1) the method of atomization and ablation grinding of sintered diamond electrodes has been put forward, and the experimental system has been constructed. At the present stage, the oxidation layer is produced in the reaction region by the atomization and ablation of the liquid, and its resistivity is high, and it is not easy to burn. Using sintered diamond electrode, partial discharge of electrode metal to participate in atomization ablation, dressing oxide layer of diamond grain on line, ensuring the ablation reaction to be carried out efficiently and continuously.) the servo control method of pressure as detection signal is put forward. The whole system is designed and built. It includes pressure acquisition, signal processing, servo drive and serial port communication of real time acquisition and monitoring test data based on LabVIEW. The PID control method, fuzzy control method and inverse proportional control method are implemented. It was found that the process of composite machining was divided into four stages: discharge induction, high efficiency ablation, abrasive grinding and electrode dressing. The process optimization tests of die steel and high strength steel were carried out. The influence of parameters (peak current, pulse width, pulse interval, electrode speed) on the characteristics of atomized ablative grinding composite machining was studied. For die steel, the composite machining method can be processed efficiently and stably, and the efficiency is 6.3 times higher than that of copper electrode EDM. Compared with the ablation of copper electrode, the efficiency is increased 88%. For high strength steel, the efficiency of composite processing is 1.3 times that of atomization ablation, and the surface quality of composite processing is obviously better than that of atomized ablated surface.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG661

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