Straightening ntawm Seamless Steel Yeeb Nkab

Kev khoov deformation ntawm seamless steel kav (ERW siab- zaus vuam, LSAW submerged arc vuam, thiab lwm yam) yog qhov tseem ceeb los ntawm kev faib tsis sib xws ntawm kev ntxhov siab sab hauv + asymmetry hauv kev quab yuam sab nraud / thermal cuam tshuam. Cov yam tseem ceeb cuam tshuam tuaj yeem muab faib ua plaub pawg:

1. Cov ntaub ntawv nyoos thiab cov khoom muaj kev ntxhov siab

• Steel strip residual stress thaum dov: Tsis sib npaug txias thiab deformation thaum dov ua rau muaj kev ntxhov siab nyob hauv cov hlau sawb / ntawv. Tom qab dov mus rau hauv cov yeeb nkab, qhov kev ntxhov siab raug tso tawm, ua rau cov yeeb nkab khoov spontaneously.
• Material Performance inhomogeneity:Cov pa roj carbon, manganese, thiab lwm yam khoom sib cais nyob rau hauv lub billet, los yog tsis sib xws ntawm cov hlau sawb (transverse phab ntsa thickness sib txawv), ua rau qhov sib txawv ntawm lub zog hauv zos thiab deformation kuj, uas ua rau asymmetric deformation tom qab ua.
• Khoom siv anisotropy:Muaj qhov sib txawv ntawm fiber ntau cov kev taw qhia thaum dov ntawm daim ntawv, thiab cov khoom siv kho tshuab hauv cov lus qhia transverse thiab longitudinal sib txawv. Tom qab tsim, qhov kev ntxhov siab faib tawm yog asymmetric raws lub voj voog ncig.

2. Kev sib txawv hauv kev tsim cov txheej txheem

• Rolling system thiab pwm sib txawv:Deviations nyob rau hauv lub hnav ntawm txoj kev rolls, uneven xovxwm -down quab yuam, los yog sib txawv nyob rau hauv lub centerline ntawm pwm ua rau inconsistent curvature ntawm cov yeeb nkab billet thiab txawv extension nqi ntawm ob sab. Hauv qhov xwm txheej hnyav, nws tuaj yeem ua rau kauv twisting ntawm lub cev yeeb nkab.
• Kev sib txhuam thiab kev pub mis sib txawv:Tsis txaus nro nyob rau hauv lub unwinding seem, skew ntawm daim ntawv qhia zaub mov, thiab cov hlau sawb raug pub ntawm ib tug oblique lub kaum sab xis mus rau hauv lub forming seem ua rau cumulative dabtsi yog khoov deviations pib ntawm thawj pass.
• Tsis raug ua ntej- dabtsi yog khoov thiab sib sau:Ntug tsis txaus ua ntej- dabtsi yog khoov, tsis tsim nyog JCO tsim cov kauj ruam nrug / pwm qhib degree, ua rau muaj kev ntxhov siab nyob rau hauv cov yeeb nkab seem thiab tag nrho cov ncaj tshaj tus qauv tom qab tsim.

3. Welding thermal deformation (qhov tseem ceeb tshaj plaws tshwj xeeb ua rau seamless steel kav)

• Asymmetric welding cua sov input: Thaum welding ntawm ib sab, lub weld sab yog concentratedly rhuab, thiab lub txias contraction yog loj dua li ntawm cov khoom siv hauv paus, ua rau cov yeeb nkab lub cev khoov rau sab weld (feem ntau hu ua "welding khoov"); Yog hais tias lub tshav kub sab hauv thiab sab nraud nyob rau hauv ob chav -sided vuam tsis sib xws, tib yam teeb meem yuav tshwm sim.
• Qhov "rib nyhuv" ntawm weld tshaj qhov siab:Tsis sib npaug qhov siab nyob rau sab hauv thiab sab nraud ntawm lub vuam, sib npaug rau kev tsim kho ntawm ib sab ntawm cov yeeb nkab lub cev, txwv tsis pub deformation ntawm sab thiab ua rau tag nrho curvature sib txawv.
• Pipe kawg "pouting" defect:Kev ua thiab vuam deformation ntawm ob qhov kawg ntawm cov vuam tsis sib xws, ua rau hauv zos warping ntawm cov yeeb nkab kawg, uas tsis tsuas yog cuam tshuam rau lub perpendicularity ntawm lub ntsej muag kawg tab sis kuj ua kom lub ntsej muag ncaj ncaj.

4. Cov txheej txheem tom ntej thiab lwm yam quab yuam

• Kev ua kom txias tsis sib xws:Muaj qhov sib txawv ntawm qhov kub thiab txias ntawm sab saum toj thiab hauv qab, sab laug thiab sab xis ntawm cov yeeb nkab tom qab vuam, thiab qhov sib txawv ntawm qhov sib txawv ntawm txhua qhov, ua rau thermal stress dabtsi yog khoov.
• Expansion thiab dej siab txheej txheem:Kev nthuav dav tsis tsim nyog, tsis yog -cov qauv sib txawv raws li cov kev taw qhia axial, los yog qhov seem ntawm kev ntxhov siab rov qab los ntawm kev ntsuas dej siab yuav ua rau muaj peev xwm khoov thiab ua rau muaj kev hloov pauv tshiab.
• Lifting thiab stacking:Cov ntsiab lus nqa tsis txaus rau cov kav dej ntev, lossis ntau txheej txheej txheej, yuav ua rau cov yas khoov vim yog lub ntiajteb txawj nqus, uas yog ib qho kev tshaj tawm - nrum deformation los ntawm sab nraud quab yuam.

Straightening yog txheej txheem tseem ceeb hauv seamless steel yeeb nkab ntau lawm kom paub meej qhov tseeb thiab kev ua haujlwm. Lub hauv paus tseem ceeb yog nyob rau hauv cov hauv qab no:
1. Kev sib dhos thiab kev tsim kho kom raug

• Pipe kawg kev ua yuav tsum:Roj tubing, cov kav dej txhua yam yuav tsum tau threading, thiab feem ntau cov txheej txheem threading yog cov yeeb nkab tig -raws li. Kev sib txawv ntawm qhov ncaj ntau dhau yuav ua rau eccentricity hauv cov xov thiab tsis ua haujlwm ntawm kev sib txuas sealing; deviation nyob rau hauv straightness kuj yuav ua rau uneven processing ntawm cov yeeb nkab kawg groove thiab overcuting deviation. 
• Ntawm -kev sib txuas ntawm qhov chaw:Nyob rau hauv kev tsim kho ntawm ntev - cov kav dej nyob deb thiab cov kav dej sib txuas, cov kav dej khoov tsis tuaj yeem ua raws nraim thiab xav tau ntawm - qhov chaw thib ob kho lossis txiav, uas ua rau cov nqi tsim kho thiab lub sijhawm tsim kho. Thaum muab tso rau hauv qhov ntev, qhov sib txawv me me ntawm cov khoom sib txawv tuaj yeem sib sau ua ib qho loj loj offsets.

2. Ua kom muaj kev nyab xeeb thiab kev pabcuam lub neej

• Kev ruaj ntseg qauv:Raws li cov qauv kev txhawb nqa lossis cov cuab yeej siv tshuab, khoov yuav ua rau muaj kev ntxhov siab hauv zos, thiab kev pabcuam ntev - yog qhov ua rau qaug zog tawg.
• Kev ua haujlwm thauj mus los:Lub nkhaus sab hauv phab ntsa ntawm cov dej thauj cov yeeb nkab yuav ua rau muaj kev kub ntxhov, nce kev thauj mus los thiab ua kom lub zog hauv zos, ua kom cov yeeb nkab ua haujlwm ntev.
• Txheej zoo:Hauv 3PE thiab lwm cov txheej txheem txheej, cov kav dej khoov yuav ua rau cov txheej txheem tsis sib xws thiab tsis ua haujlwm ntawm cov txheej nyias nyias, ua rau muaj kev phom sij rau cov kav dej.

3. Tshem tawm thiab homogenize residual stress

• Txoj kev ncaj yog ua tiav los ntawm kev tswj cov yas rov qab deformation, uas rov faib cov txheej txheem thiab vuam seem nyob rau hauv cov yeeb nkab lub cev, txo qhov kev ntxhov siab thiab tiv thaiv cov yeeb nkab los ntawm kev deforming tsis tu ncua thaum ua tom ntej, cia, los yog siv, yog li stabilizing qhov tseeb qhov tseeb.

4. Ua raws li cov khoom lag luam tus qauv kam rau ua

• Cov qauv tseem ceeb xws li API 5L, GB / T 3091, thiab GB / T 9711 txhua tus muaj qhov xav tau meej rau kev ncaj ntawm cov kav dej steel (feem ntau Tsawg dua lossis sib npaug li 0.15% L, nrog cov kev xav tau siab siab txog tsawg dua lossis sib npaug li 0.05% L). Txoj kev ncaj yog ib txoj kev tsim nyog rau kev ua kom tau raws li cov qauv thiab ua tiav lub Hoobkas xa khoom.

Rau ncaj seam steel yeeb nkab ntau lawm, txias mechanical straightening yog txheej txheem tseem ceeb, supplemented los ntawm kub straightening. Nyob rau tib lub sijhawm, ua ntej-kev ua haujlwm yog ua los tswj kev txo qis ntawm kev khoov, tsim kom muaj kev ua tiav ntawm "kev tiv thaiv + kev ncaj ncaj + nplua ncaj + ntxiv kev ncaj".

1. Mainstream txias straightening txheej txheem thiab khoom siv
(1) Multi-cov menyuam inclined rau cov menyuam ncaj tshuab (cov khoom siv tseem ceeb rau kev ncaj ncaj)

• Txoj cai ua haujlwm: Nws siv ntau pawg ntawm interleaved inclined curved straightening rollers (feem ntau yog rau los yog xya tus menyuam cov qauv), nrog rau cov menyuam axis ntawm 25℃mus rau 35℃inclination lub kaum sab xis ntawm cov yeeb nkab axis; Cov menyuam hauv qab tsav cov yeeb nkab kom tig thiab ua ntej axially, thaum cov menyuam sab sauv siv lub zog compressive, ua rau cov yeeb nkab rov qab rov qab khoov ib ncig ntawm lub voj voog, los ntawm elastic- yas deformation, maj mam tshem tawm tag nrho cov lus qhia ntawm curvature.
• Muaj cov xwm txheej: Kev ncaj ncaj ncaj ntawm txoj kab nruab nrab thiab me me ERW welded kav, los yog ntxiv kev ncaj ncaj rau cov kav loj - txoj kab uas hla, nrog kev ncaj ncaj ncav cuag li ntawm 0.2mm / m.
• Qhov tseem ceeb parameter tswj:Qhov sib nrug ntawm cov menyuam yog 0.8 mus rau 1.2 npaug ntawm cov yeeb nkab txoj kab uas hla; Tus nqi txo yuav tsum tshaj qhov tawm los deformation ntawm cov khoom tab sis qis dua lub zog tensile, kom tsis txhob tawg lossis shrinkage; Qhov kev nrawm nrawm rau carbon steel feem ntau yog 20 txog 40m / min.

(2) Siab straightening tshuab (loj straightening rau loj -kab kav)

• Txoj cai ua haujlwm: Raws li peb txoj cai - taw tes dabtsi yog khoov tshuab, ob qho kev txhawb nqa tuav cov yeeb nkab lub cev hauv lub cev khoov, thiab lub siab muaj zog yog siv rau qhov siab tshaj plaws ntawm qhov sib npaug ntawm cov yeeb nkab, ua rau cov yeeb nkab rov qab los ntawm cov yas deformation, thiab tom qab rebounding, ua tiav qhov kev xav tau ncaj.
• Muaj cov xwm txheej: Local supplementary straightening for large -diameter thickness-walled LSAW welded pipes, los yog rau cov kav dej uas muaj zog khoov hauv zos, feem ntau siv nrog rau cov menyuam ncaj.
• Cov yam ntxwv txheej txheem: Nws tuaj yeem saib xyuas deflection hauv lub sijhawm tiag tiag thiab kho tus nqi txo raws li xav tau; Cov tshuab ntse niaj hnub tuaj yeem txiav txim siab qhov txo qis raws li kev ntsuas thawj zaug deflection, hloov cov kev paub ntawm phau ntawv.

(3) Coordinated straightening nyob rau hauv lub expansion txheej txheem

• Kev nthuav dav txias yog txheej txheem txheej txheem rau loj - txoj kab uas hla ncaj seam submerged arc welded kav, siv cov pwm los nthuav cov yeeb nkab nyob ib ncig ntawm lub voj voog, tsis yog tsuas yog tshem tawm cov welding residual kev nyuaj siab thiab txhim kho roundness, tab sis kuj tsim nyog tswj lub expansion strain tus nqi, uas muaj peev xwm ho txhim kho lub zuag qhia tag nrho ncaj, tswj qhov ncaj 1% ntawm qhov tseem ceeb ntawm 0. ua ntej".

2. Kub straightening txheej txheem (supplementary kuv thod)
Feem ntau siv yog nplaim taws ncaj:

• Txoj kev ua haujlwm:Nyob rau sab convex ntawm cov yeeb nkab khoov, siv cov pa oxygen -ethane nplaim taws rau sawb lossis taw tes cua sov, nrog rau qhov kub thiab txias ntawm 700 mus rau 850℃(cov hlau tig tsaus liab), ces txias lawm los yog nrog dej, siv lub contraction deformation ntawm lub cua sov cheeb tsam kom tshem tawm qhov qub bending.
• Muaj cov xwm txheej: Hauv zos loj deformation kho nyob rau hauv cov kab ntau lawm, ntawm - kho qhov chaw, qhov cua sov dav feem ntau tsis ntau tshaj ob zaug ntawm cov yeeb nkab phab ntsa thickness, thiab nruj kub tswj yuav tsum tau kom tsis txhob overheating los yog cov khoom deterioration.

3. Straightening kev npaj nyob rau hauv cov txheej txheem ntau lawm
Hom ncaj seam welded yeeb nkab ntau lawm kab straightening txheej txheem kev npaj:
Kev sib sau thiab vuam → Weld seam leveling → Cold expansion → Rough straightening (parallel rollers / large roller spacing) → Fine straightening (inclined roller straightening machine) → Hydraulic test → (local supplementary straightening) → Pipe end processing → Finished product inspection