發(fā)布時間：2018-04-18 12:39

  本文選題：復(fù)雜曲面 + 數(shù)控銑削　； 參考：《昆明理工大學》2017年碩士論文

【摘要】：隨著科學技術(shù)的進步和經(jīng)濟水平的提高,復(fù)雜曲面零件在模具、工具、能源、交通、航空航天和海航等領(lǐng)域中的應(yīng)用越來越廣泛。目前,常見的復(fù)雜曲面類零件有雕塑曲面零件、直紋面零件、蒙皮零件以及組合曲面零件等,此類零件形狀復(fù)雜、曲率變化大、空間扭曲程度高且含薄壁結(jié)構(gòu),加工難度很大,多軸數(shù)控銑削工藝方法及其加工裝備成為解決復(fù)雜曲面零件加工的有效手段。其中,復(fù)雜曲面多軸數(shù)控銑削涉及到的關(guān)鍵技術(shù)包括復(fù)雜曲面造型、多軸銑削工藝、刀軸姿態(tài)控制、多軸數(shù)控加工刀軌計算、后置處理技術(shù)、數(shù)控加工過程仿真和銑削工藝參數(shù)優(yōu)化等方面。然而,目前針對復(fù)雜曲面零件多軸數(shù)控銑削質(zhì)量的研究仍缺乏面向多工藝參數(shù)、多優(yōu)化目標的過程集成優(yōu)化方法和手段,尚未構(gòu)建能夠支持CAD-CAM-CNC數(shù)據(jù)鏈模型的過程仿真與集成優(yōu)化平臺。本文以水輪機葉片為研究對象,針對其變曲率、大扭曲的型面特征及其多軸數(shù)控銑削質(zhì)量難預(yù)測問題,提出了基于多軸銑削加工過程仿真與集成優(yōu)化的銑削質(zhì)量分析方法。首先,分析了復(fù)雜曲面多軸銑削過程中的主要工藝參數(shù)、切削行為、性能質(zhì)量及其影響關(guān)系,建立了水輪機葉片的數(shù)字化模型,給出了其數(shù)控銑削工藝規(guī)劃方案,在此基礎(chǔ)上完成了刀位軌跡計算,并建立了葉片多軸銑削仿真模型;然后,搭建了葉片多軸數(shù)控銑削過程仿真集成框架,并基于OPTIMUS平臺開發(fā)了多軸銑削過程系統(tǒng)集成接口,建立了復(fù)雜曲面多軸銑削集成數(shù)據(jù)鏈模型;最后,以水輪機葉片的表面銑削質(zhì)量和切削力水平為優(yōu)化目標,將切削速度、進給量和切削深度三個工藝參數(shù)作為輸入文件完成了 455組集成仿真數(shù)據(jù),給出了銑削過程仿真集成數(shù)據(jù)的試驗設(shè)計,構(gòu)建了銑削工藝參數(shù)與銑削優(yōu)化目標之間的響應(yīng)面模型,并得到了在論文仿真工況下葉片多軸銑削的最優(yōu)工藝參數(shù)。本論文研究成果揭示了復(fù)雜曲面多軸銑削過程中工藝參數(shù)的變化規(guī)律,量化分析了不同加工工藝參數(shù)對復(fù)雜曲面銑削質(zhì)量的影響,實現(xiàn)了加工過程中工藝信息的及時反饋和調(diào)整,縮短了仿真時間,提高了變曲率、大扭曲自由曲面銑削質(zhì)量分析的準確性,對提高復(fù)雜曲面零件數(shù)控銑削質(zhì)量具有十分重要的理論意義和生產(chǎn)應(yīng)用價值。
[Abstract]:With the progress of science and technology and the improvement of economic level, complex curved surface parts are more and more widely used in the fields of mould, tool, energy, transportation, aviation and aerospace, HNA and so on.At present, the common complicated curved surface parts include sculptural curved surface parts, straight-cut surface parts, skinned parts and composite curved surface parts. The shape of this kind of parts is complex, the curvature change is large, the space distortion degree is high and contains thin-walled structure, so it is very difficult to process.Multi-axis NC milling technology and its processing equipment have become an effective means to solve the machining of complex curved surface parts.Among them, the key technologies involved in multi-axis NC milling of complex surfaces include complex surface modeling, multi-axis milling technology, cutter axis attitude control, multi-axis NC machining tool track calculation, post-processing technology.NC machining process simulation and milling process parameters optimization and so on.However, the research on multi-axis NC milling quality of complex curved surface parts is still lack of process integration optimization method and means for multi-process parameters and multi-optimization objectives.A process simulation and integration optimization platform capable of supporting CAD-CAM-CNC data link model has not yet been constructed.In this paper, taking the turbine blade as the research object, aiming at the characteristics of variable curvature, large distortion profile and difficult prediction of multi-axis NC milling quality, a milling quality analysis method based on multi-axis milling process simulation and integrated optimization is proposed.Firstly, the main technological parameters, cutting behavior, performance and quality of complex curved surface in the process of multi-axis milling are analyzed, the digital model of turbine blade is established, and the NC milling process planning scheme is given.On this basis, the tool path calculation is completed, and the simulation model of blade multi-axis milling is established. Then, the integrated framework of multi-axis NC milling process simulation is built, and the integrated interface of multi-axis milling process system is developed based on OPTIMUS platform.An integrated data link model for multi-axis milling of complex surfaces is established. Finally, the cutting speed is optimized by taking the surface milling quality and cutting force level of the turbine blade as the optimization target.Three process parameters, feed and cutting depth, are used as input files to complete 455 sets of integrated simulation data. The experimental design of milling process simulation integrated data is given, and the response surface model between milling process parameters and milling optimization target is constructed.The optimum process parameters of blade multi-axis milling are obtained under the simulation condition of the paper.The research results of this paper reveal the changing rule of process parameters in the process of multi-axis milling of complex surfaces, and quantitatively analyze the influence of different processing parameters on the milling quality of complex surfaces.The real-time feedback and adjustment of process information are realized, the simulation time is shortened, and the accuracy of milling quality analysis of variable curvature and large twisted free surface is improved.It is of great theoretical significance and practical value to improve the NC milling quality of complex curved surface parts.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG547

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