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1、ChangeVieChangeVieF-Xw中國(guó)機(jī)械工程第21卷第2期2010年1F-X月下半w月DeDerrPPw改ClicktobuyNOW!善鈦合金切削加工性的置氫工藝及置氫量?jī)?yōu)wClicktobuyNOW!化wmwmwowo.dock.c.dock.cu-tracu-trac危衛(wèi)華11122暋徐九華暋傅玉燦暋侯紅亮?xí)±钪緩?qiáng)1.南京航空航天大學(xué),南京,210016暋暋2.北京航空制造工程研究所,北京,100024摘要:為了改善鈦合金的切削加工性能,提出將鈦合金進(jìn)行置氫處理后再進(jìn)行切削加工。在650曟、750曟和800曟下對(duì)Ti
2、-6Al-4V合金進(jìn)行了置氫處理,并在干切削條件下對(duì)其開展了切削力、切削溫度對(duì)比試驗(yàn)。結(jié)果表明:在置氫工藝相同時(shí),隨著置氫量增加,熱電偶的熱電勢(shì)系數(shù)越來越大;主切削力在650曟置氫時(shí)相對(duì)未置氫試件僅降低2%,750曟置氫時(shí)沒有降低,而800曟置氫時(shí)主切削力約下降了8%;切削溫度均呈現(xiàn)先快速降低、經(jīng)過一平緩變化段后又快速增加的變化趨勢(shì),在650曟、750曟和800曟置氫情況下,切削溫度相對(duì)未置氫試件分別約降低了50曟、76曟和80曟。最終確定優(yōu)選的置氫工藝為:在800曟下置氫、保溫6h、隨爐冷卻至室溫;最佳置氫量范圍為0灡21%~0灡
3、37%。關(guān)鍵詞:鈦合金;置氫工藝;置氫量;熱電勢(shì)系數(shù);切削力;切削溫度中圖分類號(hào):TG506暋暋暋文章編號(hào):1004—132X(2010)02—0196—06OptimizationofHydrogenationProcessandHydrogenationConcentrationinImprovingTitaniumAlloyMachinability11122WeiWeihua暋XuJiuhua暋FuYucan暋HouHongliang暋LiZhiqiang1.NanjingUniversityofAeronauticsand
4、Astronautics,Nanjing,2100162.BeijingAeronauticalManufacturingTechnologyResearchInstitute,Beijing,100024Abstract:Thetitaniumalloyisakindoftypicaldifficult-to-cutmaterial.Beforemachining,thetitaniumalloyswereprocessedat650曟,750曟and800曟bythermohydrogentreatmenttechnologyr
5、espectivelyinordertoimprovethemachinability.Themeasurementexperimentsaboutcuttingforceandcuttingtemperaturewerecarriedoutindrycutting.Theresultsshowthat,whenthehydrogenationprocessisidentical,thermoelectromotiveforcecoefficientincreaseswiththeincreaseofhydrogenconcentr
6、ation.WhentheTi-6Al-4Valloywashydrogenatedat650曟,750曟and800曟respectively,themaincuttingforcefalls2%,0%and8%respectively.Moreover,thecuttingtemperaturefirstlyrapidlyreduces,secondlyflatlychanges,thirdlyrapidlyincreseswiththeincreaseofhydrogenconcentration,andthecuttingt
7、emperaturereduces50曟,76曟and80曟respectivelyunderthethreehydrogenationtemperature.ThepreferredhydrogenationprocessofTi-6Al-4Visasfollows,theprocessisconcludedat800曟for6hours,thencooledinthefurnace,andtheoptimumhydrogenconcentrationrangesfrom0.21%to0.37%.Keywords:titanium
8、alloy;hydrogenationprocess;hydrogenationconcentration;thermoelectromotiveforcecoefficient;cuttingforce;cuttingtempera
