1. Vim li cas cov xim tawg thaum cov xim galvanized-coated coils yog khoov? Lub hauv paus yog dab tsi?
A: Lub hauv paus ua rau cov xim tawg thaum khoov yog tias txheej txheej tsis txaus los tiv thaiv lub tensile lossis compressive deformation los ntawm khoov lub substrate. Qhov no yog ib qho teeb meem tshwm sim.
Thaum daim ntawv yog khoov, lub txheej txheej yog stretched, thiab lub puab txheej yog compressed. Yog hais tias lub txheej nws tus kheej yog nkig los yog tsis zoo adhesion rau substrate, nws tsis tuaj yeem hloov mus rau qhov deformation, thaum kawg ua rau tawg lossis tev.
Tshwj xeeb, cov teeb meem hauv qab no hauv cov txheej txheem tsim khoom yog cov culprits:
Cov txheej tuab tuab heev: Cov txheej zoo li "lub tsho tawv" -qhov tuab dua, qhov elasticity tsawg dua, thiab yooj yim dua nws tawg thaum khoov.
Tshaj - ci: Kev kub siab ntau dhau los yog lub sijhawm ci ntev yuav ua rau cov txheej txheej txheej dhau -crosslink, ua nyuaj thiab nkig, ua rau kev hloov pauv yooj yim.
Kev kho tsis zoo: Qhov no cuam tshuam qhov adhesion ntawm txheej thiab substrate. Yog tias siv cov tshuaj pretreatment ntau dhau los yog kev ntxuav tsis tiav, adhesion yuav txo qis, thiab cov txheej yuav yooj yim tev tawm tag nrho thaum khoov.
2. Yuav ua li cas rau scientific txiav txim siab dabtsi yog khoov ntawm ib batch ntawm pre-coated steel coils?
A: Txoj kev tshawb fawb tshaj plaws yog los ntawm "T-bend test." Qhov kev ntsuam xyuas no ncaj qha ntsuas cov txheej txheej qhov ua tau zoo tshaj plaws nyob rau hauv 180-degree khoov thiab yog ib qho kev ntsuas kev lag luam.
Yuav ua li cas rau qhov kev xeem: Fold lub pre{0}}coated steel ntawv qauv 180 degrees, ces muab daim kab xev rau sab hauv los yog sab nraud thiab sai sai tev tawm. Saib seb cov txheej txheej puas tawg los yog tev tawm.
Tus nqi T- sawv cev li cas:
T sawv cev rau lub thickness ntawm ib daim hlau.
0T sawv cev rau qhov kawg khoov, piv txwv li, folding nws ncaj qha rau hauv ib nrab yam tsis muaj dab tsi sandwiched nyob nruab nrab. Qhov no yuav tsum tau txheej txheej kom muaj qhov yooj yim heev.
1T sawv cev rau folding nws nyob rau hauv ib nrab nrog ib daim ntawv hlau ntawm tib lub thickness sandwiched nyob rau hauv nruab nrab.
2T sawv cev rau folding nws nyob rau hauv ib nrab nrog ob daim hlau ntawm tib lub thickness sandwiched nyob nruab nrab ntawm. Thiab li ntawd.
Qhov me me ntawm T- tus nqi, qhov zoo dua cov khoom siv khoov.
3. Dhau li ntawm cov khoom nws tus kheej, txoj kev khoov puas tuaj yeem ua rau tawg?
A: Yog, cov txheej txheem ua tsis raug yog ib qho tseem ceeb rau kev tawg. Txawm hais tias cov khoom nws tus kheej tsim nyog, cov teeb meem tuaj yeem tshwm sim tau yooj yim yog tias siv cov haujlwm tsis raug hauv qab no:
Txoj kev khoov tsis raug: Cov kev taw qhia dov ntawm cov xim -coated steel ntawv (piv txwv li, cov kev taw qhia uas cov ntawv hlau tau dov rau ntawm cov kab ntau lawm) txo nws cov toughness. Yog hais tias txoj kab bending yog nyob rau tib lub sij hawm dov kev taw qhia thaum lub sij hawm khoov, qhov kev pheej hmoo ntawm kev tawg yuav ntau heev. Txoj hauv kev kom raug yog ua kom txoj kab khoov txuas mus rau qhov kev taw qhia dov lossis ntawm 90-degree lub kaum ntse ntse.
Lub vojvoog me me dhau lawm: Qhov me me ntawm lub kaum sab xis ntawm lub kaum sab xis ntawm qhov khoov, qhov hnyav dua qhov stretching thiab compression ntawm txheej. Ib lub vojvoog me me dhau (tshwj xeeb tshaj yog 180-degree khoov) tuaj yeem yooj yim dhau ntawm txheej txheej kev txwv. Ib txoj hauv kev nyab xeeb yog tias lub vojvoog dabtsi yog khoov yuav tsum yog tsawg kawg 1.5 npaug ntawm daim ntawv tuab.
Cov ntawv tuab dhau: Cov ntawv tuab dua, qhov ntau dua qhov kev ntxhov siab deformation uas yuav tsum tau kov yeej thaum khoov. Thaum daim ntawv thickness tshaj cov khoom siv khoov txwv, cracking yuav luag inevitable.
4. Yuav ua li cas tiv thaiv kev khoov cov kab nrib pleb thaum xaiv cov khoom siv thiab ua tiav?
A: Kev tiv thaiv zoo dua li kho. Koj tuaj yeem pib nrog peb lub ntsiab lus hauv qab no kom muaj kev nyab xeeb:
** Xaiv cov ntaub ntawv raws li "T- khoov" index:**
Qhia meej meej thov cov neeg xa khoom los muab T- khoov cov ntaub ntawv ntsuas kev ua tau zoo raws li GB/T 12754-91 cov qauv.
Rau cov khoom uas xav tau kev khoov nyuaj, ua ntej cov khoom lag luam nrog qis T- khoov qhov tseem ceeb (piv txwv li, 0T lossis 1T). Qee qhov kev ua tau zoo - txheej txheej, xws li Cov Khoom Siv Hluav Taws Xob Tshwj Xeeb (SRP), muaj kev ua haujlwm zoo dua ntawm kev khoov.
** Ua tib zoo saib xyuas ntug: **
Cov npoo ntawm cov ntawv hlau yog cov ntsiab lus tsis muaj zog thiab ua rau micro- tawg.
** Pom zoo xyaum: ** Fold cov npoo sab hauv lossis sab nraud los ntawm kev khoov, tso cai rau tus thawj, coated nto los npog qhov txiav ntug. Qhov no yog txoj hauv kev zoo tshaj plaws thiab muaj txiaj ntsig zoo los tiv thaiv corrosion thiab tawg.
Tsis tas li ntawd, chamfering lossis deburring cov npoo txiav tuaj yeem tshem tawm cov ntsiab lus kev ntxhov siab thiab txo qhov kev pheej hmoo ntawm kev tawg.
5. Kuv yuav ua li cas yog tias cov xim tawg tuaj tom qab khoov?
A: Cov xim pleev xim ua rau puas tsuaj rau cov txheej txheem tiv thaiv ntawm lub rooj tsavxwm, tso cai rau xeb kom kis tau sai ntawm cov kab nrib pleb. Lawv yuav tsum tau hais kom sai. Txoj kev npaj kho yog nyob ntawm qhov hnyav ntawm cov kab nrib pleb:
Me Cracks:
Ntxuav: Ua tib zoo ntxuav qhov chaw tawg nrog cov tshuaj ntxuav tes kom tshem tawm cov roj thiab hmoov av.
Sanding: Maj mam xuab zeb cov npoo ntawm cov kab nrib pleb nrog cov ntawv xuab zeb zoo kom du lawv.
Kov-up Painting: Ua ntej, siv ib txheej nyias ntawm ib qho tshwj xeeb los tiv thaiv- xeb primer. Tom qab nws qhuav, siv lub topcoat uas phim lub rooj tsavxwm xim.
Cracks hnyav / Xim Peeling (Exposing the Substrate):
Cleanup: Ua tib zoo tshem tawm cov xim xoob lossis tev tawm nrog cov cuab yeej.
Wide Groove: Yog tias qhov tawg yog qhov sib sib zog nqus, siv lub cuab yeej los kos "V" zawj raws li qhov kev taw qhia tawg kom tso cai rau cov xim kho kom zoo dua.
Primer Filling: Siv lub zog -adhesion primer tusyees rau "V" zoo li zawj thiab cov txheej txheej txheej.