Txheej txheem Optimization thiab Kev Ntsuam Xyuas Kev Ua Haujlwm ntawm Ti-B25 Titanium Alloy Tube Extrusion
Txhawm rau kom nrawm rau daim ntawv thov Ti-B25 titanium alloy hauv nkoj kev sib txuas lus, txoj kev tshawb no tau siv DEFORM-3D finite element software los simulate cov txheej txheem raj extrusion nyob rau hauv cov xwm txheej ntawm deformation kub ntawm 900 degree thiab strain rate ntawm 0.1 s^-1 raws li qhov sib npaug sib npaug tsim nyob rau theem pib thiab cov txheej txheem tsis zoo los ntawm daim duab ua haujlwm kub, thiab txheeb xyuas nws los ntawm kev sim extrusion tiag tiag. Cov txiaj ntsig tau pom tias nyob rau hauv cov txheej txheem no, Ti-B25 titanium alloy tube billet nrog txoj kab uas hla ntawm 62 mm × 12 mm tau ua tiav extruded, nrog zoo heev nto zoo thiab recrystallized nplej nyob rau hauv cov qauv. Tom qab kev kho kev laus ntawm 830 degree / 1h + 600 degree / 8h, lub raj xa hluav taws xob pom tau zoo heev lub zog-plasticity txuam, uas ua tau raws li qhov yuav tsum tau siv ntawm lub nkoj kav hlau txais xov.
I. Finite element qauv tsim
1. Geometric qauv
Daim duab 1 qhia ib daim duab schematic ntawm extruded billet thiab tuag. Tus qauv peb-dimensional ntawm lub billet, extrusion cylinder, thiab extrusion pas nrig yog tsim los siv SolidWorks software thiab hloov mus rau hauv cov ntaub ntawv STL uas tuaj yeem lees paub los ntawm DEFORM-3D software.
Txhawm rau txhim kho qhov kev ua tau zoo ntawm kev suav, tsuas yog 1/4 ntawm lub raj tau zoo meshed (saib daim duab 2) kom ntseeg tau tias qhov tseeb thiab qhov sib txuam ntawm cov txheej txheem simulation.
2. Kev tsim qauv
Raws li kev tshawb fawb yav dhau los ntawm kev kub siab deformation tus cwj pwm ntawm Ti-B25 titanium alloy, qhov kev simulation no siv qhov sib npaug tshwj xeeb (cov qauv tshwj xeeb raug tshem tawm ntawm no thiab tso tawm hauv daim duab), uas qhia meej txog tus cwj pwm rheological ntawm cov khoom ntawm qhov sib txawv ntawm qhov kub thiab txias.
3. Kev teeb tsa Parameter
Raws li lub thermal ua daim duab ntawm Ti-B25 titanium alloy, qhov deformation kub yog xaiv li 900 degree thiab tus nqi strain yog 0.1 s^-1 . Nyob rau tib lub sijhawm, kev sib txhuam coefficient ntawm lub billet thiab tuag yog teem rau 0.3 thiab thermal conductivity yog teem rau 5. Cov txheej txheem simulation siv ib kauj ruam loj ntawm 0.5 hli, tag nrho ntawm 600 kauj ruam, thiab cov ntaub ntawv tau txais kev cawmdim txhua. 2 cov kauj ruam los xyuas kom meej qhov ua kom tiav ntawm cov txiaj ntsig simulation.
II. Simulation cov txiaj ntsig thiab kev tsom xam
1. Kev soj ntsuam kev ntxhov siab
Daim duab 3 qhia txog kev ntxhov siab ntawm kev faib tawm ntawm Ti-B25 titanium alloy tube billets ntawm ntau theem thaum txheej txheem extrusion. Nyob rau theem pib, qhov kev ntxhov siab loj yog nyob ntawm lub taub hau thiab tus Tsov tus tw ntawm lub raj; Raws li cov extrusion zuj zus, qhov kev ntxhov siab nce ntxiv tom qab lub hauv ntej kawg nkag mus rau hauv lub extrusion chim, thiab qhov kev ntxhov siab yog tawm sai sai tom qab dhau los ntawm txoj siv sizing. Qhov siab tshaj plaws sib npaug kev ntxhov siab tseem tshwm sim ntawm lub vojvoog ntawm lub extrusion chim tuag.
2. Kev tshuaj xyuas qhov chaw lim
Daim duab 4 qhia txog cov kev hloov pauv hloov thaum lub sij hawm extrusion txheej txheem. Thawj hom yog me me, thiab raws li lub raj dhau los ntawm txoj siv sizing, cov kab mob nce zuj zus, tshwj xeeb tshaj yog nyob rau ntawm lub vojvoog ntawm txoj siv sizing, uas yog ib qho yooj yim los tsim ib qho chaw deformation tuag, thiab yuav tsum tau them nyiaj tshwj xeeb.
3. Kev ntsuas qhov ntsuas kub
Daim duab 5 qhia txog qhov kub ntawm qhov chaw faib khoom thaum lub sij hawm extrusion txheej txheem. Nyob rau theem pib, qhov saum npoo ntawm lub raj billet cools down vim yog tshav kub pauv, thiab lub deformation ib feem heats li vim yog hloov dua siab tshiab ntawm yas deformation ua hauj lwm rau hauv lub tshav kub zog, uas ua rau ib tug loj uneven kub cheeb tsam. Qhov siab tshaj plaws thiab qis tshaj qhov sib txawv yog 170 degree, qhia tias qhov kub thiab txias deformation yuav tsum tau tswj nruj me ntsis thiab cov qauv tsim yuav tsum tau ua kom zoo.
III. Tube extrusion kev sim
1. Kev ntsuam xyuas qhov zoo
Qhov kev sim siv qhov ntsuas kub ntawm deformation 900 degree, strain rate 0.1 s^-1, thiab extrusion ceev 50 mm/s rau extrusion. Raws li pom nyob rau hauv daim duab 6, lub extruded raj muaj siab ncaj thiab du nto, tab sis muaj me ntsis flaws nyob rau hauv pem hauv ntej kawg vim qhov kub thiab txias poob thiab unstable deformation, uas yog ib txwm tshwm sim.
2. Chav ntsuas kub txhua yam khoom
Los ntawm cov khoom siv kev laus kev kho mob, Ti-B25 titanium alloy raj qhia tau hais tias zoo heev lub zog-plasticity txuam, ua tau raws li cov kev cai nruj ntawm nkoj kav hlau txais xov raj. Cov txiaj ntsig no txheeb xyuas qhov tseeb ntawm cov lej simulation thiab qhov laj thawj ntawm cov txheej txheem tsis raug.
