Txiav cov yam ntxwv ntawm titanium alloy
Thaum lub hardness ntawm titanium alloy ntau dua HB350, txiav yog tshwj xeeb tshaj yog nyuaj. Thaum nws qis dua HB300, nws yooj yim los lo rau ntawm rab riam thiab txiav nyuaj. Txawm li cas los xij, qhov nyuaj ntawm titanium alloys tsuas yog ib qho ntawm qhov nyuaj ntawm machining. Qhov tseem ceeb yog nyob rau hauv cov kev cuam tshuam ntawm cov tshuaj, lub cev thiab txhua yam khoom ntawm titanium alloy nws tus kheej ntawm nws cov kev ua tau zoo. Titanium alloys muaj cov nram qab no tej yam kev mob:
(1) Me me deformation coefficient: Qhov no yog qhov zoo tshaj plaws ntawm titanium alloy txiav. Lub deformation coefficient tsawg dua los yog ze rau 1. Cov zawv zawg kev sib txhuam ntawm cov chips ntawm lub ntsej muag rake tau nce ntau, uas ua rau cov cuab yeej siv nrawm dua.
(2) Kub txiav: Txij li cov thermal conductivity ntawm titanium alloy me me heev (sib npaug li 1/5 txog 1/7 ntawm No. 45 steel), qhov sib cuag ntev ntawm lub nti thiab lub ntsej muag rake yog luv heev, thiab lub tshav kub generated thaum lub sij hawm txiav yog tsis yooj yim hloov. . Tuaj tawm, concentrated nyob rau hauv tej cheeb tsam thiab ib tug me me nyob ze ntawm lub txiav ntug, lub txiav kub yog siab heev. Nyob rau hauv tib txoj kev txiav, qhov kub ntawm qhov txiav tuaj yeem ua tau ntau dua ob npaug ntawm kev txiav 45 steel.
(3) Loj txiav quab yuam ib cheeb tsam: lub ntsiab txiav quab yuam yog li 20 feem pua tsawg dua li cov hlau txiav. Vim qhov kev sib cuag luv luv ntawm lub nti thiab lub ntsej muag rake, qhov txiav quab yuam ntawm ib cheeb tsam sib cuag tau nce ntau, uas yuav ua rau chipping. Nyob rau tib lub sijhawm, vim qhov me me elastic modulus ntawm titanium alloy, nws yooj yim rau bending deformation nyob rau hauv qhov kev txiav txim ntawm radial quab yuam thaum lub sij hawm ua, ua rau kev vibration, nce cov cuab yeej hnav, thiab cuam tshuam rau qhov raug. Yog li ntawd, cov txheej txheem txheej txheem yuav tsum muaj rigidity zoo.
(4) Qhov tshwm sim hnyav hnyav: Vim muaj cov tshuaj lom neeg muaj zog ntawm titanium, ntawm qhov kub siab dua, nws tuaj yeem nqus tau oxygen thiab nitrogen hauv huab cua los ua ib qho tawv thiab tawv tawv; Nyob rau tib lub sijhawm, yas deformation thaum txiav tuaj yeem ua rau Nto hardening. Qhov tshwm sim ntawm kev ua hauj lwm hardening tsis tsuas yog txo qhov qaug zog ntawm ib feem, tab sis kuj nce cov cuab yeej hnav, uas yog ib qho tseem ceeb heev yam ntxwv thaum txiav titanium alloys.
(5) Cov cuab yeej yog ib qho yooj yim rau hnav: Tom qab qhov khoob yog ua tiav los ntawm stamping, forging, kub dov, thiab lwm yam, ib qho nyuaj thiab nkig tsis sib xws ntawm daim tawv nqaij, uas tuaj yeem yooj yim ua rau chipping, ua kom tshem tawm cov tawv nqaij tawv tshaj plaws. txheej txheem nyuaj hauv titanium alloy ua. Tsis tas li ntawd, vim muaj cov tshuaj lom neeg muaj zog ntawm titanium alloy thiab cov cuab yeej siv, cov cuab yeej ua rau cov nplaum hnav nyob rau hauv cov xwm txheej ntawm kev txiav kub thiab loj txiav quab yuam ib cheeb tsam. Thaum tig titanium alloys, qee zaum hnav ntawm lub ntsej muag rake tseem hnyav dua li ntawm lub ntsej muag flank; thaum tus nqi pub f<0.1mm/r, the wear mainly occurs on the flank face; when f>{{0}}.2 mm / r, Lub ntsej muag ntawm lub ntsej muag yuav hnav; Thaum siv cov cemented carbide cov cuab yeej rau kev ua tiav thiab ib nrab tiav, nws yog qhov tsim nyog rau cov flank hnav VBmax tsawg dua 0.4 hli.
Thaum lub sij hawm milling, vim tsis tshua muaj thermal conductivity ntawm titanium alloy cov ntaub ntawv, qhov kev sib cuag ntev ntawm chips thiab lub ntsej muag rake yog luv heev, thiab lub tshav kub generated thaum txiav tsis yooj yim rau dissipate, thiab yog concentrated nyob rau hauv lub txiav deformation cheeb tsam thiab me me cheeb tsam. . thaj tsam ze rau qhov txiav ntug. Thaum lub sij hawm machining, tsis tshua muaj siab txiav kub yuav raug generated ntawm lub txiav ntug, uas yuav shorten lub neej ntawm lub cuab tam. Rau titanium alloy Ti6Al4V, thaum lub cuab yeej lub zog thiab lub tshuab fais fab tso cai, qhov tseem ceeb cuam tshuam rau lub cuab yeej lub neej yog qhov kub thiab txias, tsis yog lub zog txiav.
Hauv cov txheej txheem ntawm kev txiav titanium alloy, cov teeb meem uas yuav tsum tau them sai sai rau yog:
(1) Vim lub me me elastic modulus ntawm titanium alloy, lub clamping deformation thiab quab yuam deformation ntawm lub workpiece thaum lub sij hawm ua yog loj, uas yuav txo tau cov kev ua hauj lwm ntawm lub workpiece; lub clamping quab yuam yuav tsum tsis txhob loj heev thaum lub workpiece raug ntsia, thiab pab txhawb ntxiv yog tias tsim nyog.
(2) Yog tias siv cov kua dej uas muaj hydrogen, nws yuav decompose thiab tso tawm hydrogen ntawm qhov kub thiab txias thaum lub sij hawm txiav, uas yuav absorbed los ntawm titanium thiab ua rau hydrogen embrittlement; Nws kuj tseem tuaj yeem ua rau muaj kev kub ntxhov siab corrosion cracking ntawm titanium alloys.
(3) Cov tshuaj chloride hauv cov kua txiav tuaj yeem decompose lossis volatilize cov pa phem thaum siv. Yuav tsum tau ceev faj txog kev nyab xeeb thaum siv, txwv tsis pub nws yuav tsum tsis txhob siv; cov khoom yuav tsum tau muab ntxuav kom huv si nrog cov tshuaj chlorine tsis muaj tshuaj ntxuav tam sim ntawd tom qab txiav kom tshem tawm cov khoom seem uas muaj chlorine.
(4) Nws yog txwv tsis pub siv cov cuab yeej thiab cov khoom siv ua los ntawm cov hlau lead lossis zinc-based alloys hauv kev sib cuag nrog titanium alloys, thiab kev siv tooj liab, tin, cadmium thiab lawv cov alloys kuj raug txwv.
(5) Tag nrho cov cuab yeej, fixtures los yog lwm yam khoom siv nyob rau hauv kev sib cuag nrog titanium alloy yuav tsum huv si; ntxuav cov titanium alloy qhov chaw yuav tsum tiv thaiv kom tsis txhob muaj cov pa paug los ntawm cov roj lossis cov ntiv tes, txwv tsis pub nws yuav ua rau muaj kev ntxhov siab los ntawm ntsev (sodium chloride) yav tom ntej.
(6) Nyob rau hauv ib txwm muaj xwm txheej, thaum txiav titanium alloys, tsis muaj kev pheej hmoo ntawm ignition. Tsuas yog nyob rau hauv micro-txiav, cov chips me me txiav tawm muaj ignition thiab combustion. Txhawm rau kom tsis txhob muaj hluav taws kub hnyiab, ntxiv rau kev tso dej ntau ntawm cov kua txiav, cov chips yuav tsum tau tiv thaiv kom tsis txhob sib xyaw ntawm cov cuab yeej siv tshuab. Cov cuab yeej yuav tsum tau hloov tam sim ntawd tom qab nws yog blunt, los yog txiav ceev yuav tsum tau txo thiab pub tus nqi yuav tsum tau nce ntxiv kom cov nti thickness. Yog tias hluav taws tawg, cov khoom siv tua hluav taws xws li talcum hmoov, limestone hmoov, thiab xuab zeb qhuav yuav tsum tau siv los tua hluav taws. Nws yog nruj me ntsis txwv tsis pub siv cov pa roj carbon tetrachloride thiab cov pa roj carbon dioxide tua hluav taws, thiab tsis tso cai rau dej, vim tias dej tuaj yeem ua kom tawg thiab ua rau muaj hluav taws tawg.
