1. Optimize Bending Process Parameters (Pre-Kev Tiv Thaiv Kev Ua Haujlwm)
Xaiv txoj kev khoov zoo
Rauthick-walled pipes (wall thickness >8 hli)los yogme me dabtsi yog khoov radii (tsawg dua los yog sib npaug rau 3 × yeeb nkab txoj kab uas hla): Sivsov khoov(kub qhov khoov cheeb tsam rau 150-200 degree) es tsis txhob txias dabtsi yog khoov. Sov dabtsi yog khoov txo cov hlau lub zog tawm los, txo qis deformation tsis kam, thiab txo qhov seem ntawm tensile kev nyuaj siab ntawm sab nrauv arc.
Raunyias- cov kav dej (phab ntsa thickness Tsawg dua lossis sib npaug li 8 hli)los yogloj dabtsi yog khoov radii (Ntau tshaj los yog sib npaug rau 5 × yeeb nkab txoj kab uas hla): Txias dabtsi yog khoov tau, tab sis sivmandrel khoovkom tsis txhob cov yeeb nkab phab ntsa vau los yog ntau dhau thinning ntawm sab arc.
Optimize tuag thiab clamping tsim
Sivpolyurethane-coated los yog nylon tuages tsis txhob liab qab hlau tuag los tiv thaiv khawb, hnav, los yog zeb nplai tshem tawm ntawm cov yeeb nkab nto.
Kho qhov clamping siab kom tsis txhob muaj qhov sib txawv hauv cheeb tsam -indentations ntxiab ya raws thiab ua cov ntsiab lus pib corrosion.
Tswj khoov deformation
Txwv covthinning tus nqi ntawm sab nrauv arckom tsawg dua los yog sib npaug li 5% (xam los ntawm kev sib piv ntawm phab ntsa tuab ua ntej thiab tom qab khoov). Cov thinning ntau dhau ua rau cov yeeb nkab phab ntsa tsis muaj zog thiab ua kom muaj kev nkag mus rau corrosion.
2. Ncej -Bending Processing (Core Remediation Steps)
Kauj Ruam 1: Kev kho qhov saum npoo
Siv amos stainless hlau hlau txhuamlos yognplua -grained aluminium oxide sandblasting (siab dua los yog sib npaug rau 0.3 MPa)kom tshem tawm cov khawb, hnav cov cim, lossis oxide txheej puas ntawm qhov khoov cheeb tsam. Lub hom phiaj ntawm qhov roughness yog Ra 3-5 μm, uas muab cov chaw nucleation tsis sib xws rau kev tsim patina.
So tag nrho cov yeeb nkab nrog degreasing tus neeg sawv cev (xws li, isopropyl cawv) kom tshem tawm cov roj stains los ntawm clamping lossis ua haujlwm -cov roj residues thaiv oxidation thiab ua rau tsis sib xws patina.
Kauj Ruam 2: Kev ntxhov siab nyem annealing (Critical for heavy bending)
Rau cov kav dej siv nyob rau hauv ib puag ncig hnyav (nqaij ntug dej hiav txwv, kev lag luam, thaj chaw txias) lossis nrog kev khoov deformation hnyav: Kub tag nrho cov yeeb nkab rau550-620 degree(hauv qab pearlite transformation kub), tuav rau1-2 teev rau 25 hli ntawm cov yeeb nkab phab ntsa thickness, tom qab ntawd maj mam txias hauv qhov cub kom tsawg dua lossis sib npaug li 200℃ua ntej cua txias.
Cov txheej txheem no tshem tawm60-80% ntawm residual tensile stress, tiv thaiv kev ntxhov siab corrosion cracking (SCC) thiab ua kom zoo patina kev loj hlob thoob plaws qhov khoov thiab ncaj seem.
Kauj Ruam 3: Artificial patina acceleration
Thov adej-raws li weathering steel acceleratortusyees mus rau tag nrho cov yeeb nkab nto (tseem ceeb ntawm qhov khoov cheeb tsam) siv rab phom los yog cov menyuam. Cov mis accelerator yuav tsum phim cov yeeb nkab alloy muaj pes tsawg leeg (Cu: 0.2-0.5%, Cr: 0.3-1.2%).
Kho cov yeeb nkab hauv qhov chaw tswj hwm (20-30 degree, 70-90% txheeb ze av noo) rau 3-5 hnub. Rotate the pipe daily to ensure the bend zone is exposed to uniform moisture and temperature, forming a dense, consistent reddish-brown patina.
3. Ntev-Kev Tiv Thaiv Lub Sij Hawm (Post-Patina Maintenance)
Siv pob tshab breathable sealant: Tom qab lub patina loj hlob tuaj, muab tag nrho cov yeeb nkab nrog cov fluorocarbon -raws li breathable sealant. Qhov no cais qhov chaw los ntawm qhov tsis sib xws ntawm ib puag ncig raug (los nag los nag, plua plav pov tseg) thiab xauv rau hauv kev tiv thaiv patina, ncua nws lub neej kev pab los ntawm 2-3 xyoos. Rov siv cov sealant txhua 2-3 xyoos rau kev siv sab nraum zoov.
Kev tshuaj xyuas tsis tu ncua thiab kov -nce: Tshawb xyuas thaj tsam khoov txhua xyoo rau patina peeling lossis localized corrosion. Rau kev puas tsuaj me me, ntxuav thaj chaw, rov ua dua me me ntawm cov tsuj roj, thiab kho rau 1-2 hnub los kho patina.
