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  本文選題：微細電火花線切割加工 + 放電狀態(tài)檢測�。� 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：現(xiàn)代工業(yè)生產(chǎn)中,產(chǎn)品的尺寸越來越小,產(chǎn)品精度的要求越來越高,促使現(xiàn)代加工方法不斷向微細、高精度方向發(fā)展。微細電火花線切割加工(MWEDM)以其非接觸、高精度、低加工應(yīng)力的優(yōu)勢在微型零件加工領(lǐng)域獲得了越來越廣闊的發(fā)展空間。微細電火花加工中放電間隙及放電脈沖的控制是決定加工速度、精度、表面質(zhì)量以及加工的連續(xù)性、穩(wěn)定性的關(guān)鍵因素,本文重點對此進行了研究。本文分析、總結(jié)了當前國內(nèi)外電火花放電檢測及超聲調(diào)制電火花放電的研究現(xiàn)狀及發(fā)展趨勢,分析了微細電火花線切割放電機理及極間狀態(tài)變化,研究了超聲振動調(diào)制脈沖放電機理及其對極間放電通道的影響。在此基礎(chǔ)上設(shè)計了平均檢測和實時檢測相結(jié)合的極間放電狀態(tài)檢測方案,分別用于伺服控制和脈沖電源控制,對超聲調(diào)制脈沖電源放電提高電火花加工質(zhì)量的方法進行了探索研究。在理論分析的基礎(chǔ)上,設(shè)計了以DSP為控制核心的軟、硬件系統(tǒng)。脈沖電源實現(xiàn)了微秒級以下脈寬的脈沖放電加工。平均檢測系統(tǒng)能夠檢測極間狀態(tài),準確指導(dǎo)伺服進給。實時檢測系統(tǒng)能夠?qū)γ總�脈沖放電狀態(tài)進行判別,模糊控制算法根據(jù)實時判別結(jié)果進行模糊推理、模糊判決,實現(xiàn)對脈沖電源放電參數(shù)的動態(tài)調(diào)節(jié),提高了微細電火花線切割加工質(zhì)量。將超聲振動應(yīng)用于微細電加工,跟蹤超聲振動極間電場強度的變化控制脈沖電源放電,分析了其加工機理,研究了其對電火花加工質(zhì)量和效率的影響。本文進行了大量的實驗研究。對微細電火花線切割加工工藝規(guī)律、伺服參考、模糊控制優(yōu)化脈沖參數(shù)、超聲調(diào)制脈沖放電等進行了研究,優(yōu)化了系統(tǒng)參數(shù),提高了微細電火花線切割加工質(zhì)量和效率,實現(xiàn)了微型零件的加工,充分驗證了系統(tǒng)良好的性能及穩(wěn)定性。詳細研究了超聲振動對微細電火花線切割加工效率和質(zhì)量的影響,探索了提高加工質(zhì)量的方法。
[Abstract]:In modern industrial production, the size of products is becoming smaller and smaller, and the requirements of product precision are becoming higher and higher, which promote the development of modern processing methods to the direction of fine and high precision. MWEDM (Micro Electrical discharge WEDM) has gained more and more extensive development space in the field of micro parts because of its advantages of non-contact, high precision and low machining stress. The control of discharge gap and discharge pulse are the key factors to determine the machining speed, precision, surface quality, continuity and stability in micro EDM. This paper analyzes and summarizes the current research situation and development trend of electric spark discharge detection and ultrasonic modulation at home and abroad, and analyzes the discharge mechanism and inter-pole state change of micro spark wire cutting. The mechanism of ultrasonic vibration modulated pulse discharge and its effect on the inter-pole discharge channel are studied. On the basis of this, an inter-pole discharge state detection scheme combining average detection and real-time detection is designed, which is used for servo control and pulse power control, respectively. The methods of improving EDM quality by ultrasonic modulated pulse power discharge are studied. On the basis of theoretical analysis, a software and hardware system with DSP as the control core is designed. Pulse power supply realizes pulse discharge machining with pulse width below microsecond level. The average detection system can detect the state between the poles and guide the servo feed accurately. The real-time detection system can judge the state of each pulse discharge. The fuzzy control algorithm can make fuzzy inference and fuzzy decision according to the real-time discriminant result to realize the dynamic adjustment of the discharge parameters of the pulse power supply. The quality of WEDM is improved. The ultrasonic vibration is applied to micro electromachining. The pulse power supply discharge is controlled by tracking the change of the electric field intensity between the ultrasonic vibration poles. The machining mechanism is analyzed, and the effect of ultrasonic vibration on the quality and efficiency of EDM is studied. In this paper, a large number of experimental studies have been carried out. The process law of WEDM, servo reference, fuzzy control optimization of pulse parameters and ultrasonic modulation pulse discharge are studied. The system parameters are optimized and the quality and efficiency of WEDM are improved. The machining of micro parts is realized, and the good performance and stability of the system are fully verified. The effect of ultrasonic vibration on the efficiency and quality of WEDM is studied in detail, and the methods to improve the machining quality are explored.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG484

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本文編號：1924014