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1、沈陽(yáng)理工大學(xué)碩士學(xué)位論文摘要葉片是航空發(fā)動(dòng)機(jī)中起能量轉(zhuǎn)換作用的一類重要零件,葉片精鍛是葉片鍛造的發(fā)展趨勢(shì)。由于葉片形狀復(fù)雜,所用材料難變形,目前對(duì)葉片精鍛成形工藝的研究尚未深入,還缺乏系統(tǒng)性和規(guī)律性的認(rèn)識(shí)。因此,葉片的制造生產(chǎn)過程中經(jīng)常出現(xiàn)問題。本文采用三維熱力耦合數(shù)值模擬的方法研究GH4169高溫合金葉片精鍛成形規(guī)律,研究的主要內(nèi)容如下:首先,研究葉片精鍛成形的新工藝路線,根據(jù)實(shí)驗(yàn)和資料建立了材料模型,對(duì)新工藝路線的成形過程進(jìn)行數(shù)值模擬,根據(jù)模擬計(jì)算結(jié)果,運(yùn)用金屬成形理論知識(shí)進(jìn)行分析,找出問題所在。然后,在嘗試調(diào)整工藝參數(shù)不能解決問
2、題的情況下,改進(jìn)新的工藝路線,利用工程軟件Pro/E作為幾何建模工具,創(chuàng)建擠桿、預(yù)鍛和終鍛的模具型腔;再采用大型模擬軟件DEFORM對(duì)改進(jìn)的新工藝過程進(jìn)行模擬。接著,根據(jù)模擬結(jié)果,分析其損傷情況,應(yīng)力應(yīng)變和溫度場(chǎng)分布、載荷一下壓量曲線以及鍛后晶粒尺寸大小情況,及時(shí)修正工藝參數(shù),完成了改進(jìn)的新工藝路線的設(shè)計(jì)。最后,通過將改進(jìn)的新工藝路線的模擬結(jié)果和實(shí)際生產(chǎn)的結(jié)果相對(duì)比,可以進(jìn)一步驗(yàn)證改進(jìn)的新工藝路線的合理性和實(shí)用性。本研究為GH4169高溫合金葉片精鍛成形提供了理論指導(dǎo),對(duì)推動(dòng)航空業(yè)的發(fā)展具有重大意義。關(guān)鍵詞:高溫合金:葉片:精鍛:數(shù)值
3、模擬沈陽(yáng)理工大學(xué)碩士學(xué)位論文AbstractAblade,whichplaystheroleofenergyconversion,isoneofthemostimportantpartsinaero-engine.Precisionforgingofbladeisthetendencyofdevelopingbladeforgingtechnology.Becausetheshapeofthebladeiscomplexanditisdifficulttodeformthematerialusedtomanufactureblades
4、,thebladeprecisionforgingtechnologyisnotsophisticatedandlacksystemicandintrinsiccognition.Therefore,intheprocessofbladesmanufacturing,therealeproblems.Inthisthesis,themethodofthecoupledthermo-mechanicalnumericalsimulationwaqusedtoresearchtheprecisionforgingprocessofblad
5、emadeofhi.ghtemperaturealloyGH4169.Thefollowingcontentsareincludedinthispaper.Firstly,researchthenewtechnicalprocessofbladeprecisionforging.Basedontheexperimentsanddata,thematerialmodelWasbuiltandtheprocessWassimulated.Analyzethesimulmionresultsandthetheoryofmetalformin
6、gWasintroducedtofredouttheproblems.AstheadjustingofthetechnologicalparametersCannotsolvetheproblem,allimprovedtechnicalblueprintwasdesigned.TheengineeringsoftwarePro/Ewasregardedasgeometricmodelingtooltocreatethemodelsforbar-extrusion,preforgingandfinish-forging.Bysoftw
7、areDEFORM,theimprovedprecisionforgingprocessWassimulated.Later,analyzethedamage,temperaturestress—effective,strain-effective,load-strokecurveandtheaveragegrainsizetoamendthemodelandthetechnologicalparameters.Afterthat,thedesignofimprovedtechnicalprocessWascompleted.Comp
8、aredthesimulationresults、)~ritllthepractice,thereasonablenessandpracticalityoftheimprovedtechnicalprocesswaspr