Vim li cas Titanium Alloys nyuaj rau tshuab raws li lawv cov khoom siv? - Xov xwm

Thaum nws los txog rau machiningtitanium alloys, thawj titanium alloy uas los rau hauv siab yog zaum Ti-6Al{15}}4V. Ti-6Al-4V yog lub ntiaj teb thawj tsim thiab feem ntau siv titanium alloy, suav rau ntau tshaj li ib nrab ntawm tag nrho cov khoom siv titanium alloy. Tshwj xeeb tshaj yog rau booming humanoid robots, Ti-6Al-4V yog cov khoom nyiam vim nws tus nqi tsim nyog, siab zog, thiab lub teeb yuag. Ti-6Al-4V lub nominal muaj pes tsawg leeg yog 6% txhuas (Al) thiab 4% vanadium (V). Aluminium yog -phase stabilizing lub caij, txhim kho cov alloy chav tsev kub thiab siab kub lub zog, thaum vanadium yog -phase stabilizing caij, txhim kho cov khoom ua plasticity thiab thermal stability. Qhov no + dual-theem qauv muab Ti-6Al-4V alloys zoo heev txhua yam khoom siv. Txawm li cas los xij, los tsim Ti-6Al-4V titanium alloy qhov chaw uas ua tau raws li qhov yuav tsum tau ua los ua ke, machining yog qhov teeb meem uas tsis tuaj yeem zam. Yog li niaj hnub no, peb yuav tham txog vim li cas machining Ti-6Al-4V titanium alloys nyuaj los ntawm qhov kev xav ntawm nws cov khoom siv.

Ntawm txhua yam uas ua rau muaj kev nyuaj siab hauv machining Ti-6Al-4V, nws cov thermal conductivity tsawg heev tau lees paub tias yog qhov tseem ceeb tshaj plaws thiab kev txiav txim siab. Qhov no zoo li Pandora lub thawv uas tshwm sim los ntawm cov txheej txheem txiav, ua rau muaj kev cuam tshuam ntawm cov saw hlau thiab tswj hwm nws cov kev sib tw machining. Hlau txiav yog qhov tseem ceeb ntawm kev ua phem ntawm cov yas deformation, qhov twg 99% ntawm cov tshuab hluav taws xob hloov mus rau hauv tshav kub. Ordinary steels thiab aluminium alloys, nrog rau lawv cov thermal conductivity zoo, tuaj yeem nqa tawm 60% -80% ntawm cov cua sov los ntawm cov chips, feem ntau ntawm cov cua sov tau nqa tawm los ntawm cov chips, tsuas yog 10% -20% yuav tsum tau siv rau cov cuab yeej txiav. Txawm li cas los xij, Ti-6Al-4V muaj cov thermal conductivity tsawg heev, tsuas yog 1/6-1/7 ntawm nruab nrab carbon steel xws li 45 steel thiab 1/16 ntawm aluminium alloys, ua rau nws "thermal insulator." Qhov no ua rau ntau tshaj 80% ntawm cov cua sov ua kom muaj zog nyob rau hauv qhov chaw nqaim ntawm lub cuab yeej, ua rau cov cua kub hnyav heev. Qhov kev kub ceev txuas ntxiv no tuaj yeem ncav cuag tau yooj yim lossis ntau tshaj 1000 degree, qhov kub siab no yog kev puas tsuaj rau cov cuab yeej txiav. Piv txwv li, qhov kub thiab txias tuaj yeem ua rau thermal softening ntawm cov khoom siv xws li cemented carbide thiab high-speed steel, txo lawv cov hardness thiab hnav tsis kam. Nyob rau tib lub sijhawm, nws ua rau atomic diffusion, exacerbating diffusion thiab nplaum hnav ntawm lub cuab yeej thiab workpiece. Ua-up ntug spalling tuaj yeem ua rau crater hnav, thiab oxidation cov tshuaj tiv thaiv nyob rau hauv qhov kub-kub, oxygen-nplua nuj ib puag ncig ntxiv hnav cov cuab yeej. Meanwhile, rau machined titanium alloys, siab kub yog pauv mus rau lub machined nto, ua rau saum npoo kub hnyiab, metallographic hloov, thiab weakening lub qaug zog kev ua tau zoo thiab corrosion kuj ntawm qhov chaw. Nws kuj txhawb cov tshuaj tiv thaiv ntawm Ti-6Al-4V nto txheej nrog O thiab N ntsiab lus nyob rau hauv cov huab cua, tsim ib tug nyias, nkig, thiab nyuaj-case txheej los yog nitride txheej. Cov txheej no tsis tsuas yog ua rau txiav nyuaj tab sis kuj hnav lub txiav ntug thiab exacerbates ua hauj lwm hardening, tsim ib tug vicious voj voog.

Qhov tseem ceeb tshaj, qhov siab - qhov kub thiab txias ib puag ncig tshwm sim los ntawm cov thermal conductivity tsawg ua raws li cov khoom siv hluav taws xob, ua kom cov txiaj ntsig tsis zoo ntawm lwm yam nyuaj - rau - cov khoom siv tshuab. Piv txwv li, nws activates tshuaj lom neeg kev ua si, intensifying tshuaj tiv thaiv ntawm lub cuab tam thiab workpiece, uas peb yuav tham nyob rau hauv ib tug tom ntej seem. Yog li ntawd, kev tswj cov tsub zuj zuj ntawm kev txiav cov cua sov daws ib nrab ntawm cov teeb meem ntawm Ti-6Al-4V machining. Yog li, lub hom phiaj tseem ceeb ntawm kev ua kom zoo tshaj plaws xws li cov cuab yeej tshiab txheej txheej, lub siab-siab thiab qis-kub txias yog kom tswj tau cov cua sov hauv cheeb tsam txiav.

Lub microstructure thiab nti morphology ntawm Ti-6Al-4V kuj tseem cuam tshuam rau nws cov machinability. Qhov tseem ceeb tshaj, tag nrho cov xwm txheej no tsis nyob ib leeg tab sis sib cuam tshuam, tsim kom muaj kev sib koom ua ke, tus kheej - txhawb nqa "kev nyuaj-rau-machinability system".

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