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1、ChangeVieChangeVieF-Xw中国机械工程第21卷第2期2010年1F-X月下半w月DeDerrPPw改ClicktobuyNOW!善钛合金切削加工性的置氢工艺及置氢量优wClicktobuyNOW!化wmwmwowo.dock.c.dock.cu-tracu-trac危卫华11122暋徐九华暋傅玉灿暋侯红亮暋李志强1.南京航空航天大学,南京,210016暋暋2.北京航空制造工程研究所,北京,100024摘要:为了改善钛合金的切削加工性能,提出将钛合金进行置氢处理后再进行切削加工。在650曟、750曟和800曟下对Ti
2、-6Al-4V合金进行了置氢处理,并在干切削条件下对其开展了切削力、切削温度对比试验。结果表明:在置氢工艺相同时,随着置氢量增加,热电偶的热电势系数越来越大;主切削力在650曟置氢时相对未置氢试件仅降低2%,750曟置氢时没有降低,而800曟置氢时主切削力约下降了8%;切削温度均呈现先快速降低、经过一平缓变化段后又快速增加的变化趋势,在650曟、750曟和800曟置氢情况下,切削温度相对未置氢试件分别约降低了50曟、76曟和80曟。最终确定优选的置氢工艺为:在800曟下置氢、保温6h、随炉冷却至室温;最佳置氢量范围为0灡21%~0灡
3、37%。关键词:钛合金;置氢工艺;置氢量;热电势系数;切削力;切削温度中图分类号:TG506暋暋暋文章编号: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
