Vim li cas qee cov kav hlau tsis sib xws?

Rau cov thawj coj ntawm kev yuav khoom, tus tsim qauv engineers, thiab cov neeg tsim khoom, kev nrhiav cov kav hlau tsis yog tsuas yog tau txais txoj kab uas hla sab nraud (OD) thiab qib steel. Ib qho tseem ceeb tshaj plaws, tseem tsis tau pom dua, qhov ntsuas tau zoo yogphab ntsa thickness uniformity.

Thaum cov yeeb nkab steel raug kev txom nyem los ntawm qhov tsis sib xws ntawm phab ntsa thickness -tshwj xeeb hu uaphab ntsa thickness eccentricitylos yogeccentric sib txawv- nws tsis yog ib qho kev tsis zoo nkauj xwb. Nws yog ib qho kev phom sij. Cov yeeb nkab tsis sib xws tau ua rau thaj chaw tsis muaj zog uas tuaj yeem ua rau muaj kev puas tsuaj loj hauv kev kub ntxhov, ua kom muaj zog hauv cheeb tsam corrosion, thiab vuam kev sib raug zoo thaum lub sijhawm teeb tsa.

Tab sis dab tsi ua rau qhov tsis sib xws? Nws puas yog ib qho cim ntawm kev tsim khoom pheej yig, lossis nws puas yog qhov kev txwv ntawm qee yam kev tsim khoom?

Nyob rau hauv phau ntawv qhia no, peb yuav rhuav tshem cov metallurgical thiab txhua yam ua rau tsis sib xws ntawm cov yeeb nkab steel phab ntsa thickness, sib piv yuav ua li cas cov kev tsim khoom sib txawv cuam tshuam rau kev sib txawv, thiab muab cov lus qhia txog kev yuav khoom rau koj los tiv thaiv koj cov haujlwm los ntawm cov khoom siv tsis zoo.

Nyob rau hauv lub ntiaj teb zoo tshaj plaws engineering, steel yeeb nkab hla -section yog ob lub voj voog zoo kawg nkaus. Txawm li cas los xij, hauv qhov tiag - ntiaj teb kev tsim khoom, qee theem ntawm kev sib txawv yog qhov tsis muaj tseeb.

Ua lej, phab ntsa thickness eccentricity (E) yog qhia raws li:

Qhov twg:

• T_maxyog lub siab tshaj plaws phab ntsa thickness ntsuas ntawm ib tug muab cross-section.
• T_minyog qhov tsawg kawg nkaus phab ntsa thickness ntsuas ntawm tib tus ntoo khaub lig-section.

Yog tias qhov feem pua ​​​​ntawm qhov ntsuas no tau dhau los ua tus qauv thoob ntiaj teb (xws li ASTM, EN, lossis API), cov yeeb nkab raug cais raws li qhov tsis zoo. Cia peb tshawb txog cov hauv paus hauv paus ntawm qhov tshwm sim no hla ntau txoj kev tsim khoom.

seamless steel yeeb nkab teb tho txheej txheem

Seamless steel kav yog nyiam heev rau siab - siab thiab kev siv cov txheej txheem tseem ceeb vim lawv tsis muaj welded seam. Txawm li cas los xij, vim tias lawv hollowed tawm los ntawm cov khoom steel billet ntawm qhov kub thiab txias, lawv muaj kev cuam tshuam rau phab ntsa thickness unevenness.

Lub hauv paus ua rau feem ntau tshwm sim thaum peb theem tseem ceeb ntawm kev tsim khoom:

A. The Piercing Stage (Lub Plawv Tseem Ceeb)

Txoj kev taug kev ntawm cov yeeb nkab seamless pib nrog cov khoom sib tw ua kom sov kom dhau 1200℃(2192℉). Lub pob zeb tho quab yuam lub khob hliav qab - zoo li lub ntsaws (mandrel) los ntawm qhov nruab nrab ntawm qhov spinning, liab - kub billet los tsim lub plhaub hollow. Qee qhov teeb meem mechanical ntawm no ua rau eccentricity:

• Billet Center Deviation:Yog tias cov hlau tsis huv tsis sib xws, lossis yog qhov chaw nruab nrab - xuas nrig ntaus ntawm qhov kawg ntawm lub billet yog tawm -center, lub tho qhov mandrel yuav ib txwm txav mus rau sab softer (kub) los yog ua raws li txoj kev ntawm qhov tsis kam.
• Mandrel Hnav thiab Flexing:Lub mandrel (piercing plug) ua haujlwm nyob rau hauv huab cua thermal thiab mechanical stress. Yog hais tias tus pas nrig mandrel khoov me ntsis, lossis yog tias lub ntsaws ntsaws tsis sib xws, qhov tshwm sim hollow plhaub yuav muaj phab ntsa tuab ntawm ib sab thiab nyias phab ntsa ntawm lwm qhov.
• Qhia Roller Alignment:Yog hais tias cov ntawv qhia chais los yog daim hlau uas stabilize lub billet thaum lub sij hawm tho yog misaligned, lub billet yuav wobble, tsim ib tug helical (kauv) qauv ntawm cov phab ntsa tsis sib xws.

B. Lub Elongator thiab Rolling Stage

Tom qab tho, lub tuab - lub plhaub hollow yog dov thiab ncab hla lub mandrel bar hauv mandrel zeb (MPM) los yog ntsaws zeb kom txo cov phab ntsa tuab thiab nce qhov ntev.

• Kev sib txhuam kub:Yog hais tias muaj qhov kub thiab txias gradient hla lub voj voog ntawm lub plhaub (xws li, ib sab txias sai dua li lwm qhov ntawm cov khoom siv), cov hlau ntws ntawm cov nqi sib txawv thaum dov, ua rau tsis sib xws.
• Inconsistent Roll Gaps:Yog hais tias cov rolls ntawm lub nruam dov zeb tsis calibrated precisely, los yog yog hais tias lub dov quab yuam fluctuates, qhov sib txawv ntawm cov rolls thiab mandrel bar yuav sib txawv, squeezing cov hlau unevenly.

C. The Stretch Reducing Mill (SRM) Theem

Nyob rau hauv qhov kawg sizing theem, cov yeeb nkab yog rub los ntawm ib tug series ntawm yob stands tsis muaj ib tug internal mandrel mus cuag lub kawg txheej txoj kab uas hla.

• Tension Variations:Yog tias qhov nro ntawm cov yob sawv tsis zoo tswj tau, nws tuaj yeem ua rau "kawg thickening" lossis localized thinning raws lub cev ntawm cov yeeb nkab.

3. Cov hauv paus ntsiab lus ntawm qhov tsis sib xws ntawm phab ntsa Thickness hauv Welded Steel Pipes (ERW / LSAW / SSAW)

Tsis zoo li cov kav dej seamless, welded kav yog tsim los ntawm ca steel coils los yog daim hlau (skelp) uas yog khoov rau hauv ib tug tubular zoo thiab welded.

erw welded steel yeeb nkab txoj kev

Thaum welded kav feem ntau khav theeb zoo dua phab ntsa thickness uniformity dua seamless kav (vim tiaj- dov steel ntawv tolerances yog heev controllable), thickness variations tseem tuaj yeem tshwm sim vim muaj cov hauv qab no:

A. Raw Material Gauge Variation (Coil Crown)

Steel coils uas ua los ntawm kub- sawb mills yog ib txwm me ntsis thicker nyob rau hauv qhov chaw tshaj li ntawm ntug- ib tug tshwm sim hu uayas.

• Thaum cov kauj no tau txiav thiab tsim rau hauv cov yeeb nkab, cov npoo uas sib ntsib los ua cov vuam seam yuav thinner dua li sab nraub qaum (qhov nruab nrab ntawm qhov qub strip), uas ua rau me me geometric tsis sib xws thoob plaws lub voj voog.

B. Misalignment Thaum Roll forming

Hauv Cov Hluav Taws Xob Hluav Taws Xob Welded (ERW) thiab Longitudinal Submerged Arc Welded (LSAW) cov kav dej, lub tiaj tus hlau phaj tau hloov zuj zus los ntawm cov chais.

• Yog tias cov ntawv yob tau hnav los yog tsis sib npaug, lawv tuaj yeem siv lub siab asymmetrical, ua rau ib sab ntawm lub phaj ncav cuag ntau dua li lwm qhov ua ntej nws mus txog qhov chaw vuam.

Raws li tus kws tshaj lij tus thawj tswj hwm, txais cov kav hlau tsis zoo nrog cov phab ntsa tuab tsis zoo tuaj yeem ua rau koj qhov project. Siv tsib lub tswv yim no thaum koj qhov kev muab khoom thiab kev tswj xyuas zoo (QC) los tiv thaiv koj cov peev:

1. Tso cai kuaj Ultrasonic (UT) hauv koj QAP

Kev kuaj pom pom tsis tuaj yeem kuaj pom me me hauv eccentricity. Thaum sau koj Daim Ntawv Pov Thawj Zoo (QAP), xav kom cov chaw tsim khoom ua haujlwm tas liUltrasonic Phab Ntsa Thickness Ntsuas (UT).

• UT sensors luam theej duab cov yeeb nkab ncig thiab longitudinally, muab ib daim ntawv qhia meej digital ntawm phab ntsa tuab. Thov UT cov ntaub ntawv xeem raws li daim ntawv yuav tsum xa khoom.

2. Qhia Tighter Tolerances dua tus qauv yam tsawg kawg nkaus

Cov txheej txheem thoob ntiaj teb xws li ASTM A53 lossis ASTM A500 tso cai rau phab ntsa thickness kam rau siab mus rau -12.5%. Rau siab- kev siv kev ntxhov siab (xws li sib sib zog nqus- dej piling, cov kav dej siab siab, lossis cov khoom siv hluav taws xob dynamic),tsis txhob cia siab rau tus qauv yam tsawg kawg nkaus.

• Sib tham txog kev cai, nruj dua kev zam nrog lub zeb (xws li, txwv kev hloov pauv mus rau -5% lossis -8%) thiab xyuas kom meej tias qhov no tau sau meej meej rau hauv Daim Ntawv Txiav Txim Siab (PO).

3. Vet tus kws tsim khoom cov cuab yeej thiab Billet Sourcing

Lub zeb tsuas yog zoo li nws cov tshuab. Thaum tshawb xyuas - tsim nyog rau lub Hoobkas kav dej seamless, nug:

• Lawv puas siv cov tshuab nruab nrab tsis siv neeg rau cov cua sov thiab xuas nrig ntaus?
• Dab tsi yog qhov kev sib hloov thiab hloov lub voj voog rau lawv cov tho mandrels?
• Puas yog lawv tau txais daim ntawv pov thawj los ntawm tier-1 steel txiag?(Sourcing huv, homogeneous billets drastically txo cov deformation ntuj thaum tho).

4. Ua Qhov thib peb Random-Kev Tshawb Fawb Kev Tshawb Fawb (SGS, TÜV, Intertek)

Tsis txhob cia siab rau Mill Test Certificate (MTCs). Ntiav tus neeg sab nraud thib peb -tus neeg soj ntsuam xyuas mus xyuas lub Hoobkas thaum lub sijhawm ua haujlwm lossis thauj khoom. Tus neeg soj ntsuam yuav tsum siv lub micrometer digital thiab UT ntsuas qhov tuab ntawm tsawg kawg 5% ntawm cov khoom siv ntawm peb lub ntsiab lus ntawm txhua cov yeeb nkab xaiv: ob qho tag nrho thiab nruab nrab.

5. Xaiv Welded Pipes (ERW/HSS) Thaum Uniformity yog Paramount

Yog tias koj qhov project cuam tshuam nrog cov pob qij txha nyuaj, laser txiav, lossis kev siv vuam tshuab tsis siv neeg-thiab tsis tas yuav muaj kev kub siab heev-xaiv Welded Hollow Sections (HSS)dhau seamless. Qhov zoo tshaj qhov sib xws ntawm cov kav dej welded kom ceev fabrication, yooj yim sib dhos, thiab ntau dua kev xam cov qauv.

Phab ntsa thickness variation nyob rau hauv steel kav yog ib tug neeg kho tshuab kev muaj tiag yug los ntawm khaus manufacturing puag ncig. Txawm hais tias tsis muaj cov yeeb nkab zoo tag nrho, qhov tawm - ntawm - yeeb nkab kam rau ua yog lub luag haujlwm. Los ntawm kev nkag siab lub hauv paus ua rau eccentricity-los ntawm mandrel drift nyob rau hauv seamless mills mus coil crown nyob rau hauv welded kav-koj tuaj yeem sib tham txog cov nqe lus cog lus zoo dua, teeb tsa QC tsis zoo, thiab koom tes nrog cov mills uas ua qhov tseem ceeb.

Tiv thaiv koj cov qauv, koj cov peev nyiaj, thiab koj lub koob npe nrov los ntawm kev thov kom muaj kev sim nruj thiab ua kom pom tseeb ntawm txhua qhov khoom xa tuaj.

Puas yog koj tab tom npaj ib txoj haujlwm uas yuav tsum tau muaj siab -Hollow Structural Sections (HSS) los yog seamless pressure pipes? Hu rau peb pab neeg ua haujlwm niaj hnub no los tshuaj xyuas koj qhov project specifications thiab ruaj ntseg ntawv pov thawj, siab -cov khoom steel tsis sib xws raws li koj cov qauv hauv zos.

Tiv tauj peb