Titanium rods, tuav, xov hlau thiab raj feem ntau tawm dov, kos duab los yog extrusion nrog wavy zoo tsis xws luag thiab residual curvature. Straightening restores straightness thiaj li downstream machining, txiav thiab zaum kawg soj ntsuam yuav mus reliable. Ob txheej txheem ntxiv yog siv: nro (stretch) straightening thiab multi-roller straightening, feem ntau ua ntej los ntawm lub siab ncaj rau cov khoom khoov heev.
Ntxoov (stretch) Straightening
Tension straightening siv lub longitudinal tensile stresssaum toj no lub zog tawm losntawm cov khoom siv, tsim cov yas txuas ntxiv uas kho cov duab tsis xws luag. Lub mechanism yog ncaj nraim:
Raws li qhov ntev ntawm lub wavy bar, qee thaj chaw muaj qhov seem ntawm kev ntxhov siab (luv luv, "ntev" thaj tsam) thiab lwm tus muaj cov kev ntxhov siab seem (ntev, "loos" cheeb tsam).
Thaum lub tensile load yog superimposed, qhov tseeb deformation kev nyuaj siab yog txo nyob rau hauv lub tensile -stressed zones (tsawg yas extensions) thiab nce nyob rau hauv lub compressive - stressed zones (ntau yas extension).
Qhov tshwm sim yog tias txhua feem ntawm qhov bar tau txais kwv yees li tib qhov txuas ntxiv, thiab qhov tsis xws luag raug tshem tawm.
Kev txuas ntxiv yog ib txwm tswj nyob rau hauv ib qho me me (feem ntau 0.5% -3%, nyob ntawm cov hlau thiab seem) kom tsis txhob dhau - ncab. Vim tias titanium muaj qhov tsis tshua muaj elastic modulus thiab siab springback, nro straightening yog tshwj xeeb tshaj yog zoo rau me me -inch hlau, nyias- phab ntsa raj thiab bar nrog maj mam waviness.
Siab Ncaj Ncaj
Rau workpieces nrog loj curvature, siab straightening yog ua ntej: lub piece yog khoov nyob rau hauv lub opposite kev taw qhia ntawm kev txhawb nqa, yog li ntawd, tom qab springback, nws yog kwv yees li ncaj. Lub siab ncaj yog nyob ntawm lub zog alloy thiab qib ntawm dabtsi yog khoov - siab dua - lub zog alloys thiab khoov loj dua yuav tsum muaj siab dua. Siab straightening feem ntau yog ua raws li cov menyuam straightening los kho qhov tshwm sim.
Ntau -Roller Straightening
Cov khoom lag luam uas yooj yim hla- ntu feem ntau ncaj nraim ntawm ntau- cov tshuab rau cov menyuam nrogntau tshaj plaub yob (feem ntau 5-29 yob). Cov rolls rov siv peb - taw tes khoov raws qhov ntev, maj mam txo qhov kev hloov pauv ntawm qhov seem curvature kom txog thaum cov khoom ncaj nraim. Lub hauv paus ntsiab lus ntawm kev ua haujlwm:
Cov yob txoj kab uas hla me me thiab ntau yob muab qhov tseeb dua qhov tseeb.Ib lub suab me me pab lub workpiece nkag mus rau hauv cov yob thiab stabilizes cov txheej txheem.
Thawj ob peb yob tsuas yog txo qhov sib txawv ntawm qhov seem curvature raws qhov ntev; qhov kawg yob smooth lub curvature mus rau uniformity.
Qhov zoo yog nyob ntawm qhov kev tiv thaiv -bending (overbend) tus nqi.Qhov thib ob thiab thib peb yob yog teem nrog ib tug loj anti- dabtsi yog khoov tus nqi; rolls tom ntej yog teem kom txhua tus straightens lub siab tshaj plaws residual curvature sab laug los ntawm cov ua ntej rolls.
Cov ntaub ntawv nyuaj dua (ntau dua strain-hardening coefficient n) nyuaj duathiab xav tau qhov loj dua los tiv thaiv- dabtsi yog khoov tus nqi, ntau yob thiab me me yob diameters.
Titanium{0}}Kev txiav txim siab tshwj xeeb
High springback:titanium's elastic modulus (txog 105-120 GPa) yog kwv yees li ib nrab ntawm cov hlau, yog li elastic rov qab tom qab khoov yog loj. Cov txheej txheem cov menyuam yuav tsum tau them nyiaj nrog ntau dua overbend dua li cov hlau.
Kev tiv thaiv nto:titanium nto tau yooj yim khawb thiab galled. Rolls yuav tsum du, zoo lubricated, thiab lub tshuab teem kom tsis txhob nto marking, uas yuav pib qaug zog tawg.
Ntu thiab qib cuam tshuam:straightening quab yuam thiab yob nqis yuav tsum tau kho rau alloy lub zog thiab hla-section; alpha-beta alloys xws li Ti-6Al-4V yuav tsum muaj zog ntau dua li cov qib ntshiab hauv kev lag luam.
Residual stress:straightening qhia txog kev tswj qhov seem - qauv kev ntxhov siab. Rau cov ntawv thov tseem ceeb, ua raws nraim nrog kev ntxhov siab- nyem anneal kom ruaj khov qhov ntev thaum lub tshuab ua haujlwm.
Txheej Txheem Txheej Txheem
Kev soj ntsuam tuaj: ntsuas qhov ncaj, ovality thiab qhov chaw saum npoo.
Siab straightening rau loj - daim curvature (yog xav tau).
Kev sib txhuam ncaj nraim rau cov hlau, nyias- phab ntsa raj thiab cov kab me me; multi-roller straightening rau cov tuav thiab cov raj nrog cov ntu yooj yim.
Kev txheeb xyuas ncaj qha tawm tsam qhov ua siab ntev hauv cov qauv siv tau (xws li ASTM B348, B861, B338).
Optional stress -relief annealing for dimensionally critical products.
