Leveler ncej rollers thiab rollformer spare qhov chaw tsis tshua muaj kev poob rau ib qho, pom tseeb vim li cas. Nyob rau hauv cov kab nruam galvanizing, cov menyuam uas zoo nkaus li ua haujlwm zoo ntawm daim duab tuaj yeem hnav tawm hauv lub lis piam - lossis ua rau txoj kab nres thaum cov kabmob txeeb tau thiab cov yob poob los ntawm nws lub tsev. Qhov sib txawv ntawm cov menyuam uas kav ntev thiab ib qho uas dhau los ua kev kho mob taub hau feem ntau yog los ntawm ob qhov kev txiav txim siab ntev ua ntej qhov chaw mus txog txoj kab: yuav ua li cas qhov kev ua haujlwm tsis ua haujlwm tau kuaj pom, thiab seb cov khoom siv thiab qhov chaw kho mob puas sib haum rau kev ua haujlwm.
Cov lus qhia no tshuaj xyuas cov txheej txheem tsis ua haujlwm tseem ceeb hauv qib qib thiab rollformer rolls, cov khoom siv thiab cov kev xaiv tawv tawv uas hais txog lawv, thiab cov kev cai geometric uas txiav txim siab seb cov khoom seem tshiab puas ua tau raws li qhov xav tau lossis dhau los ua qhov ua tsis tiav tom ntej.
Yog vim li cas Leveler Ncej Rollers Fail nyob rau hauv Galvanizing Kab
Thawj kauj ruam hauv kev qhia cov menyuam hloov pauv yog nkag siab qhov ua tsis tau tiav. Nyob rau hauv galvanizing kab nro levelers, ob txoj kev tsis ua hauj lwm tswj, thiab lawv xav tau kev daws teeb meem sib txawv.
Roll nto hnav thiab spalling. Kev ua hauj lwm yob hu rau lub sawb nyob rau hauv nro thiab dabtsi yog khoov quab yuam. Thaum cov kab nrib pleb tsis zoo - ntug nthwv dej, nruab nrab buckles, lossis weld seams - lub yob nto absorbs concentrated cuam tshuam thiab sib cuag abrasive. Kev tshawb fawb txog kev nro qib ua hauj lwm yob txheeb xyuas qhov hnav tsis zoo raws li qhov kev coj ua thawj coj, nrog rau qhov kub-dov strip zoo li raug suav hais tias yog qhov tseem ceeb ntawm kev hnav tsis xws luag. Scales thiab txawv teb chaws teeb meem ntes tau ntawm kev ua hauj lwm rolls thiab backup rolls compound qhov teeb meem, ua roughness thiab deg puas tsuaj uas hloov mus rau lub sawb. Nyob rau hauv cov xwm txheej hnyav, yob cov cim lossis qhov tsis xws luag tuaj yeem nthuav tawm mus rau hauv cov xwm txheej spalling, txawm tias nyob rau hauv cov kev sib tw uas tsis tshua muaj zog ntawm galvanizing levelers.
Roll-end bearing tsis ua hauj lwm thiab yob poob. Ib hom tsis ua hauj lwm tshwj xeeb rau qhov nro leveler dabtsi yog khoov units tsim nyog nyias nyias. Kev tshawb fawb mus rau hauv cov kab nruam galvanizing qhia tau hais tias axial rog ua haujlwm ntawm kev ua haujlwm yob qhov kawg kev txhawb nqa bearings ua rau muaj kev hnav zoo. Thaum ib sab ntawm cov kabmob hnav txaus, qhov sib txawv ntawm cov kabmob tuaj yeem khiav tawm ntawm nws lub tes tsho - ua rau lub yob poob ntawm lub tsev, khawb lub strip, thiab ua rau muaj kab tawg. Qhov no tsis yog ib qho teeb meem ntawm lub cev yob. Nws yog qhov teeb meem-theem uas muaj kev xaiv cov kabmob, kev sib dhos zoo, thiab kev tswj axial load. Hloov cov menyuam yam tsis tau hais txog cov kabmob thiab kev sib dhos yuav tsis tiv thaiv kev rov tshwm sim.
Qhov kev cuam tshuam zoo yog ncaj nraim: ua ntej txiav txim siab hloov qib qib ncej cov menyuam, paub meej tias qhov ua tsis tau zoo qhia qhov hnav tsis zoo lossis cov kabmob-kev puas tsuaj. Cov ntsiab lus qub rau cov khoom siv thiab hardness hloov khoom dua tshiab; tom kawg xav tau kev tshuaj xyuas ntawm lub rooj sib txoos ib puag ncig.
Kev xaiv khoom rau Leveler thiab Rollformer Rolls
Cov khoom xaiv rau qib thiab rollformer yob yog qhov sib npaug ntawm qhov hnav tsis kam thiab cov tub ntxhais toughness. Ib qho dhau-hardened alloy nrog siab carbon thiab chromium cov ntsiab lus tiv thaiv kev puas tsuaj tab sis tuaj yeem ua nkig nyob rau hauv kev khoov loads. Ib qho qis-alloy steel nrog cov tub ntxhais zoo zog tuaj yeem hnav sai heev rau ntawm qhov chaw. Qhov kev xaiv raug yog nyob ntawm seb hom kev ua tsis tiav twg yog dominates.
High-carbon chromium hlau xws li GCr15-hom qib yog muaj nyob rau hauv daim ntaub ntawv yob qhov twg abrasive hnav yog thawj qhov kev txhawj xeeb. Lawv teb zoo rau hardening thiab tuaj yeem ua tiav qhov tawv tawv hauv HRC 58-62 ntau yam, ua rau lawv tsim nyog rau kev ua haujlwm yob uas sib cuag nrog cov nplai lossis oxide paug. Nyob rau hauv rollformer forming chaw nres tsheb, cov qib zoo sib xws tshwm sim raws li cov ntaub ntawv rau cov menyuam, feem ntau nrog nyuaj chrome plating rau kev tiv thaiv saum npoo ntxiv.
Alloy cov cuab yeej steel xws li 9Cr2Mo thiab 60CrMoV-hom qib muaj qhov sib npaug sib txawv. Lawv muab kev hnav tsis kam zoo nrog cov tub ntxhais zoo zog dua li cov qib high-carbon chromium, ua rau lawv zoo dua qhov uas khoov loads tseem ceeb thiab yob yuav tsum tiv thaiv deflection yam tsis muaj cracking. Rau cov ntawv thov qib uas qhov yob txoj kab uas hla yog txwv los ntawm vaj tse geometry, qhov toughness margin tseem ceeb.
Cobalt-based alloys nkag mus rau hauv daim duab thaum ua hauj lwm kub los yog tshuaj lom neeg raug tshaj li cas hlau-raws li alloys yuav zam tau. Standard 42CrMo4 rollers tau raug soj ntsuam kom tawg nyob rau hauv ib puag ncig sulfide-nplua nuj, thaum AMS 5387 cobalt alloy resists galling ntawm siab kub thiab tuav ib tug zoo nto tiav tom qab sib tsoo. Qhov no tsis txhais hais tias cobalt alloys yog lub neej ntawd hloov kho rau txhua galvanizing kab cov menyuam. Lawv yog cov phiaj xwm kev daws teeb meem rau cov xwm txheej uas thermal cycling lossis corrosive media degrade cov pa steels sai dua li cov neeg siv khoom hnav ib leeg yuav kwv yees.
Rollformer txoj kev yob ua haujlwm raws li qhov tseem ceeb sib txawv. dabtsi yog khoov thiab tsim loads dominate, thiab galvanizing-kab thermal exposure yog tsis tuaj. Kev lag luam cov cuab yeej tshwj xeeb feem ntau sau npe GCr15 lossis AISI 1045 steel rau kev ua cov yob, nrog cov tawv tawv hauv HRC 58-62 ntau yam thiab xaiv chrome plating. Qhov tseem ceeb yuav tsum tau ua rau rollformer rolls yog qhov sib xws ntawm qhov profile thiab qhov tseeb qhov tseeb thoob plaws lub yob txheej, tsis yog qhov ua haujlwm siab-kub.
Deg Hardening thiab kev kho mob xaiv
Thaum cov khoom siv hauv paus raug xaiv, kev kho saum npoo yuav txiav txim siab ntev npaum li cas cov yob tiv thaiv hnav ua ntej ncav nws qhov kev hloov pauv.
Induction hardening tseem yog tus qauv mus kom ze rau leveler ua hauj lwm yob. Lub hom phiaj yog txheej txheej tawv tawv (feem ntau HRC 58–63) txhawb nqa los ntawm cov tub ntxhais tawv dua. Hardening qhov tob yuav tsum tau txiav txim siab: qhov ntiav dhau thiab cov ntaub ntawv hnav los ntawm kev sib tsoo los ntawm kev thauj khoom; tob heev thiab residual kev nyuaj siab los yog brittleness nce. Raws li cov lus qhia dav dav dav dav, qhov ua tau zoo ntawm cov ntaub ntawv qhov tob feem ntau khaws cia li ntawm 5% mus rau 10% ntawm cov yob lub cev txoj kab uas hla, tab sis cov lus pom zoo tshwj xeeb yuav tsum yog los ntawm cov chaw tsim khoom yob raws li cov ntaub ntawv thov, tsis yog los ntawm cov lus dav dav.
Hard chrome plating ua hauj lwm ob lub hom phiaj nyob rau hauv leveler thiab rollformer rolls. Nws muab qhov chaw tsis tshua muaj kev sib txhuam uas txo cov nplaum nplaum thiab khaws cov khoom, thiab nws muaj kev tiv thaiv corrosion nyob rau hauv ib puag ncig uas zinc splash los yog noo noo. Tension leveler ua hauj lwm yob yog ua lag luam nrog high-hardness chrome plating ntawm thicknesses ib ncig ntawm 65 μm, ua ke nrog nto roughness specifications. Rau rollformer rolls khiav hauj lwm ntawm galvanized los yog pre-painted strip, chrome txheej ntawm kwv yees li 0.05 hli yog ib qho kev qhia tshwj xeeb.
Nto tiav tswj yog inseparable los ntawm hardening thiab txheej. Ib qho tawv tawv tab sis ntxhib hauv av yuav tseem khaws cov nplai thiab hnav ua ntej. Conversely, ib tug heev du nto yuav txo tau sawb traction nyob rau hauv tej yam leveling los yog txoj kev hla. Qhov tsim nyog roughness nyob ntawm tus txheej txheem: kev ua hauj lwm yob hu rau sawb feem ntau qhia meej finer finishes, thaum thaub qab yob los yog phau ntawv yob yuav zam qhov chaw rougher. Kev lag luam nro leveler ua hauj lwm yob sau nto roughness zoo li Ra 0.2 μm lossis qis dua rau qee yam kev siv, tab sis qhov no yuav tsum tsis txhob raug kho raws li lub hom phiaj thoob ntiaj teb.
Kev kam rau siab thiab qhov xav tau ntawm qhov chaw uas cuam tshuam rau yob lub neej
Qhov zoo ntawm geometric zoo ntawm cov qib qib ncej cov menyuam cuam tshuam tsis yog tsuas yog strip flatness tab sis kuj coj lub neej thiab yob tus kheej hnav qauv.
Roundness thiab cylindricity ncaj qha cuam tshuam li cas load faib thoob plaws cov kabmob thiab cov sawb dav. Ib lub yob nrog lub voj voog tsis zoo yuav ua rau lub voj voog radial loads ntawm nws cov kabmob nrog txhua lub kiv puag ncig, ua kom qaug zog. Kev lag luam ua haujlwm yob rau cov qib nro yog muab nrog kev sib tw ua kom nruj li 0.010 hli lossis qis dua, thiab cylindricity tolerances nyob rau hauv 0.005-0.01 hli. Cov nuj nqis no sawv cev rau cov khoom siv hauv av, tsis muaj peev xwm ua haujlwm dav dav, thiab yuav tsum tau teev tseg tsuas yog thaum daim ntawv thov pom zoo rau tus nqi.
Circular runout cuam tshuam kev vibration thiab strip taug qab. Ib lub yob uas khiav tawm ntawm qhov tseeb yuav ua rau lub sij hawm hloov pauv thickness los yog kos npe nto. Tib yam kev lag luam tshwj xeeb sau cov voj voog khiav tawm ntawm 0.010-0.018 hli.
Txoj kab uas hla sib xws ntawm ib txheej yob yog ib qho kev xav tau ntau dhau lawm. Nyob rau hauv ib tug leveler los yog rollformer, ntau yob ua hauj lwm nyob rau hauv ib theem zuj zus. Yog hais tias hloov rolls sib txawv nyob rau hauv txoj kab uas hla los ntawm cov thawj txheej, qhov sib txawv chaw thiab inter-yob kev sib raug zoo hloov, cuam tshuam rau ob qho tib si cov txheej txheem tshwm sim thiab lub load faib ntawm yob. Qhov no yog ib qho kev kam rau siab, tsis yog ib qho kev kam rau siab, thiab nws yuav tsum tau hais txog hauv kev yuav khoom.
Nto roughness xav tau kev sib piv rau daim ntawv thov ntau dua li txo qis. Nyuaj heev thiab yob cim lub sawb; du heev thiab sawb traction tej zaum yuav tsis txaus nyob rau hauv tej yam passes. Rau galvanizing kab leveler ua hauj lwm yob, qhov tsim nyog ntau yog nyob ntawm strip thickness, nro, thiab seb lub yob yog ib tug yob ua hauj lwm yob los yog ib tug thaub qab yob.
Rollformer Shaft Rollers thiab txoj kev yob: Lub luag haujlwm sib txawv, qhov tseem ceeb sib txawv
Rollformer shaft rollers thiab cov ntawv yob sib koom ua ke "cov menyuam" lub npe nrog cov khoom sib tw, tab sis lawv cov kev ua haujlwm thiab cov ntsiab lus tshwj xeeb sib txawv hauv txoj hauv kev tseem ceeb.
Leveler rolls nyob rau hauv galvanizing kab sib cav nrog siab kub, zinc paug, thiab yuav tsum tau crush scale thaum dabtsi yog khoov sawb. Rollformer forming rolls, los ntawm qhov sib txawv, cov duab strip los ntawm ib ntu ntawm cov chaw nres tsheb ntawm qhov kub thiab txias. Lawv cov hom tsis ua hauj lwm tseem ceeb yog abrasive hnav los ntawm cov kab nrib pleb thiab qaug zog los ntawm kev rov ua dua tshiab, tsis yog thermal degradation lossis zinc corrosion.
Qhov sib txawv no hloov cov khoom siv thiab kev kho mob. Rollformer forming rolls feem ntau siv GCr15 lossis AISI 1045 steel nrog hardening rau HRC 58-62 thiab xaiv nyuaj chrome. Shafts nyob rau hauv rollforming cov cuab yeej feem ntau teev raws li 40Cr los yog AISI 1045 steel nrog tempering kev kho mob, xav txog qhov yuav tsum tau rau torsional lub zog thiab qaug zog tsis kam es tsis txhob nto hnav ib leeg.
Rau rollformer rolls, qhov tseeb qhov profile thiab teeb tsa qhov sib xws muaj qhov hnyav ntau dua li kev xaiv qhov kub thiab txias. Lub rollformer uas tsim tawm qhov tsis txaus ntseeg vim tias lub yob hloov tau raug tshuab rau qhov sib txawv me ntsis yuav tsim cov khoom seem tsis hais seb cov khoom siv hnav li cas. Kev qhia tshwj xeeb yuav tsum ua qhov tseem ceeb ntawm qhov profile qhov ntev thiab qhov kev sib raug zoo ntawm cov yob hauv qhov chaw nres tsheb.
Sib piv txoj kev daws teeb meem rau hom kev ua tsis tiav: Ib lub tswv yim ua haujlwm
Cov khoom siv thiab cov kev xaiv kho mob saum toj no yuav pab tau tsuas yog thaum txuas nrog qhov tsis ua haujlwm tiag tiag pom ntawm kab. Cov txheej txheem hauv qab no npaj cov txheej txheem kev txiav txim siab.
Yog hais tias lub yob nto qhia tau tias abrasive hnav, qhab nia, los yog polishing: Qhov tseem ceeb xav tau yog siab dua saum npoo hardness nrog txaus toughness. Xav txog lub hardened high-carbon chromium los yog alloy cuab yeej steel, xyuas kom meej tias induction hardening mus txog qhov tseeb rooj plaub qhov tob, thiab tshuaj xyuas nto tiav. Yog hais tias qhov ntsuas los yog txawv teb chaws yog qhov chaw abrasive, kev txhim kho txoj hlua khi los yog cov txheej txheem rov qab yob yuav yog qhov tseem ceeb xws li hloov cov khoom yob.
Yog hais tias lub yob nto qhia tau hais tias spalling, pitting, los yog subsurface tawg: Nto hardness ib leeg yuav tsis daws qhov no. Tshawb xyuas qhov tsis xws luag hauv subsurface nyob rau hauv cov khoom tuaj, tshuaj xyuas cov txheej txheem hardening rau cov ntaub ntawv ntau qhov tob lossis tsis txaus tempering, thiab tshuaj xyuas seb puas muaj kev cuam tshuam txawv txav (weld seams, strip shape defects) yog pib puas. Tej zaum yuav xav tau ib cov khoom tseem ceeb los yog kho dua tshiab hardening specification.
Yog hais tias qhov tsis ua hauj lwm yog bearing qaug dab peg los yog yob poob: Tsis txhob qhia tus menyuam tshiab kom txog thaum cov kabmob, axial load, thiab kev sib dhos sib dhos tau raug tshuaj xyuas. Cov ntaub ntawv nro leveler qhia txog lub zog axial ntawm qhov kawg kev txhawb nqa bearings raws li lub hauv paus ua rau yob poob qhov xwm txheej. Ib qho kev hloov cov menyuam ntsia rau hauv lub tsev tsis zoo yuav ua tsis tau zoo ib yam li qhov qub. Cov kev kho kom raug suav nrog kev tshuaj xyuas hom kabmob (thrust bearings yog qhov tsim nyog), txhim kho cov txheej txheem sib dhos, thiab cov txheej txheem kev hloov kho kom txo qis axial loading.
Yog hais tias strip flatness los yog nto zoo deteriorates tsis pom tseeb yob hnav: Txheeb xyuas qhov sib npaug ntawm qhov sib npaug ntawm lub teeb, roundness thiab runout ntawm tus kheej yob, thiab qhov xwm txheej ntawm cov yob rov qab. Lub geometrically imperfect tab sis unworn yob tseem tuaj yeem tsim cov sawb tsis tsim nyog.
Cov lus nug nquag
Yuav ua li cas yog ib tug leveler ncej cov menyuam sib txawv los ntawm ib tug rollformer ncej roller?
Ib tug leveler ncej cov menyuam ua haujlwm nyob rau hauv dabtsi yog khoov nro thiab feem ntau elevated kub nyob rau hauv ib tug leveling los yog nro leveling kab, nrog hnav tsav los ntawm sawb kev sib cuag thiab scale. Lub rollformer ncej cov menyuam tsav tsim cov yob uas zoo li lub strip ntawm ambient kub, nrog hnav tsav los ntawm kev tsim loads thiab profile contact. Qhov tseem ceeb ntawm cov khoom tseem ceeb thiab kev kam rau siab sib txawv raws li.
Puas yog tus qauv 42CrMo4 cov menyuam tuaj yeem hloov kho rau kev pabcuam galvanizing kab?
42CrMo4 tuaj yeem ua tau zoo nyob rau hauv qee qhov kev siv qib siab, tab sis nws muaj peev xwm ua rau tawg hauv qhov chaw muaj sulfide. Kev kho dua tshiab rau cov hlau nplaum cobalt lossis cov hlau uas muaj hlau ntau dua tuaj yeem tsim nyog nyob qhov twg thermal cycling los yog tshuaj lom neeg yog qhov tseem ceeb. Qhov kev txiav txim siab yuav tsum yog nyob ntawm qhov ua tsis tiav ntawm qhov xwm txheej, tsis yog ntawm cov khoom qib ib leeg.
Ntev npaum li cas yuav tsum tau hloov cov rolls?
Tsis muaj universal interval. Kev hloov pauv nyob ntawm qhov ntim ntim, strip zoo, cov khoom siv yob, thiab seb lub yob yog yob ua haujlwm lossis yob thaub qab. Kev ntsuas raws li qhov ntsuas- ntsuas qhov roughness ntawm qhov chaw, tshuaj xyuas qhov sib txawv, thiab kev soj ntsuam cov kab nrib pleb zoo-yog qhov kev ntseeg siab dua li kev hloov pauv raws li daim ntawv qhia hnub.
Yuav ua li cas ua rau ib tug leveler yob poob los ntawm nws cov vaj tse?
Yob poob nyob rau hauv nro leveler dabtsi yog khoov units tau taug qab hnav ntawm qhov chaw ua hauj lwm yob txoj kev txhawb nqa bearings nyob rau hauv axial quab yuam. Thaum ib tus kabmob hnav, cov kabmob sib txawv tuaj yeem khiav tawm ntawm nws lub tes tsho txhawb nqa, tso cai rau lub yob kom tshem tawm. Kev xaiv cov kabmob, kev sib dhos zoo, thiab axial load tswj yog qhov cuam tshuam txog kev kho.
Xaus: Txheeb xyuas qhov ua tsis tiav ua ntej xaiv cov khoom
Cov menyuam tawv tawv tsis yog ib qho zoo rau cov menyuam. Nyob rau hauv galvanizing kab levelers, qhov uas tsis ua hauj lwm tej zaum yuav yog yob nto, bearing interface, los yog sib dhos ua ke - thiab txhua tus yuav tsum tau ib tug txawv teb. Cov khoom siv hloov kho dua tshiab thiab qhov tawv tawv tuaj yeem ua rau lub neej ntev heev thaum hnav abrasive yog qhov tseem ceeb ntawm cov txheej txheem. Lawv yuav tsis kho lub tsev nyob tsis zoo lossis teeb meem axial load uas rhuav tshem cov kabmob.
Rau rollformer spare qhov chaw, qhov tseem ceeb hloov mus rau qhov tseeb profile, teeb qhov sib xws, thiab qaug zog tsis kam, nrog rau qhov tsis tshua muaj siab ntawm thermal thiab corrosion kuj. Kev qhia ob hom yob los ntawm tib cov ntaub ntawv logic ignores lub luag hauj lwm sib txawv txhua ua.
Qhov kev ntseeg siab tshaj plaws yog los tshuaj xyuas qhov ua tsis tiav, txheeb xyuas seb puas hnav, spalling, bearing puas, lossis geometric drift yog thawj qhov teeb meem, thiab qhia cov khoom siv thiab kev kho mob los hais txog cov txheej txheem tshwj xeeb. Cov neeg muab khoom uas nkag siab txog daim ntawv thov tuaj yeem pab txhawb qhov kev kuaj mob no; kev yuav khoom ib leeg ua tsis tau.
