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1、第46卷第2期2014年4月南京航空帛尿溉至JournalofNanjingUniv航天大學(xué)學(xué)報(bào)ersityofAeronautics&AstronauticsV01.46No.2Apr.2014定向凝固鎳基高溫合金葉片榫齒高效深切成型磨削傅玉燦1張志偉1徐九華1趙正彩1平波1何堅(jiān)2劉智武2王艷2余杰2(1.南京航空航天大學(xué)機(jī)電學(xué)院,南京,210016;2.西安航空動(dòng)力股份有限公司,西安,710021)摘要:針對(duì)定向凝固鎳基高溫合金DZl25葉片榫齒,采用電鍍成型CBN砂輪對(duì)其進(jìn)行了高效深切磨削(Highefficiencydeepgrinding,HEDG)試驗(yàn),對(duì)磨削比能及工件表
2、面完整性進(jìn)行了分析。結(jié)果顯示,在保持速比('Us/‰)不變時(shí),提高磨削速度弘可有效降低磨削比能,提高平均材料去除率。磨削比能表現(xiàn)出“尺寸效應(yīng)”,其值最終穩(wěn)定在40~60J/mm3之間;在相同的平均材料去除率下,磨削比能隨著磨削深度的增大而上升;在相同的單顆磨粒切厚下,磨削深度的差異對(duì)磨削比能的影響較小。對(duì)試驗(yàn)中最大平均材料去除率下獲得的工件表面質(zhì)量進(jìn)行分析發(fā)現(xiàn),已加工工件表面不同區(qū)域磨削紋理均很清晰,無(wú)皺疊及犁溝兩側(cè)翻起等現(xiàn)象;表層金相顯微組織基本無(wú)變化,未發(fā)現(xiàn)相變、撕裂及晶粒扭曲現(xiàn)象;工件表層加工硬化程度為7.7%~19%,深度為40btm。結(jié)果顯示了HEDG在高效磨削DZl25葉
3、片榫齒中推廣應(yīng)用的潛力,并為其實(shí)際生產(chǎn)中磨削參數(shù)的選擇提供了參考。關(guān)鍵詞:高效深切磨削;定向凝固鎳基高溫合金;磨削比能;單顆磨粒切厚中圖分類號(hào):TG580文獻(xiàn)標(biāo)志碼:A文章編號(hào):1005—2615(2014)02—0190—07HighEfficiencyDeepGrindingofDirectionalSolidifiedNickel—BasedSuperalloyTurbineBladeRootFuYucanl,ZhangZhiweil,XuJiuhual,ZhaoZhengcail,PingB01HeJian2,LiuZhiwu2,WangYan2,YuJie2(1.Colle
4、geofMechanicalandElectricalEngineering,NanjingUniversityofAeronautics&Astronautics,Nanjing,210016,China;2.Xi7anAeroEnginePLC,Xi’an,710021,China)Abstract:InviewO{thepoormachinability0fturbinebladerootmadeOfdirectionalsolidifiednickel—basedsuperalloyDZl25,highefficiencydeepgrinding(HEDG)processis
5、conductedtoanalyzespecificgrindingenergyandsurfaceintegritywithprofiledelectroplatedCBNgrindingwheel.Theresultshowsthathighergrindingspeed饑canlowerthespecificgrindingenergyeffectivelywhenthespeedratio(移;/勘。)keepsconstant.Thespecificgrindingenergydecreaseswiththeincreasingmeanmaterialremovalrate
6、andfinallyremainsinrangeof40一60J/ram3.Underthesamemeanmaterialremovalrate,thespecificgrindingenergyincreaseswiththedecreasingdepthofcut.However,thedifferenceofdepthofcuthaslittleeffectonthespecificgrindingenergywiththesameundeformedchipthickness.Thesur—facequalityoftheworkpieceobtainedundertheh
7、ighestmeanmaterialremovalrateisanalyzed.Thesurfacetextureisclear,anddoesnotpresentwrinklesandploughingmarks.Thephasetransitionandgraindistortionarenotobservedfromthemetallographicmicrostructure.Thedegreeofworkhardening基金項(xiàng)目:國(guó)家科技重大專