本文選題：脈沖電化學加工 + 仿真　； 參考：《合肥工業(yè)大學》2017年碩士論文

【摘要】：脈沖電化學加工能夠顯著改善電化學加工間隙過程的理、化特性,提高加工精度和表面質(zhì)量。但是,脈沖電化學加工也具有直流電化學加工的局限性和缺點,為解決其存在的不足,需要對加工過程進行仿真模擬。在電化學加工中,加工區(qū)域的溫度分布會影響電導率和電流效率,從而影響加工精度。因此,本課題主要研究脈沖電化學加工過程中溫度場的分布,通過多場耦合仿真,實現(xiàn)陽極型面的最終預測,減少試驗次數(shù),縮短陰極修整時間,節(jié)約加工成本。基于多離子傳輸與反應模型進行電化學加工仿真模擬,真實地反映出離子的電遷移、擴散和對流現(xiàn)象以及并發(fā)的電極反應(如陽極金屬溶解和氧氣析出)。通過仿真分析,擬合出電流效率—電流密度的函數(shù)表達式,并探明溫度對電流效率、電導率和電極極化的影響規(guī)律�；陔妷耗Ｐ徒⒚}沖電化學加工的多場耦合仿真模型,研究單個脈沖周期內(nèi)加工間隙的溫度變化規(guī)律,探究各工藝參數(shù)對加工間隙溫度分布的影響關系。同時,在模型中引入電流效率—溫度和電導率—溫度函數(shù)表達式,利用COMSOL with MATLAB軟件對脈沖電化學加工的全過程進行動態(tài)仿真。通過平板電極電化學加工實驗和葉片電化學加工實驗,驗證了多離子傳輸模型對電流效率仿真計算的可靠性,而基于電壓模型的葉片電化學加工動態(tài)仿真存在誤差,需要進一步優(yōu)化。
[Abstract]:Pulse electrochemical machining can significantly improve the mechanical and chemical characteristics of the electrochemical machining gap process and improve the machining accuracy and surface quality. However, pulse electrochemical machining also has the limitations and shortcomings of DC electrochemistry machining. In order to solve its shortcomings, it is necessary to simulate the machining process. In electrochemical machining, the temperature distribution in the processing area will affect the electrical conductivity and current efficiency, thus affecting the machining accuracy. Therefore, the distribution of temperature field in pulse electrochemical machining is mainly studied in this paper. Through multi-field coupling simulation, the final prediction of anode profile can be realized, the number of experiments will be reduced, the dressing time of cathode will be shortened, and the processing cost will be saved. The simulation of electrochemical machining based on multi-ion transport and reaction model can truly reflect the electromigration diffusion and convection phenomena of ions as well as the concurrent electrode reactions such as anodic metal dissolution and oxygen precipitation. The functional expression of current efficiency and current density is fitted by simulation analysis, and the effect of temperature on current efficiency, conductivity and electrode polarization is investigated. Based on the voltage model, a multi-field coupling simulation model of pulse electrochemical machining was established to study the temperature variation of machining gap in a single pulse cycle, and to explore the relationship between the process parameters and the temperature distribution of machining gap. At the same time, the expressions of current efficiency temperature and conductivity temperature function are introduced into the model, and the dynamic simulation of the whole process of pulse electrochemical machining is carried out by using COMSOL with MATLAB software. The reliability of the multi-ion transfer model for the simulation of current efficiency is verified by the experiments of plate electrode electrochemical machining and blade electrochemical machining. However, there are errors in the dynamic simulation of blade electrochemical machining based on voltage model. Further optimization is needed.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG662

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