Loj - Diameter Square Thiab Rectangular Tubes tsim thiab tsim li cas? Dab tsi yuav tsum tau sau tseg thaum lub sijhawm tsim khoom?

Rau qhov loj - txoj kab uas hla square thiab lub voj voos (feem ntau yog xa mus rau cov uas muaj ib sab qhov ntev ntawm Ntau dua lossis sib npaug li 200mm), cov txheej txheem tseem ceeb yog qhov puag ncig - mus rau -square transformation (tube extrusion / dov) los yog kev sib sau ncaj qha (steel strip dov + high{5}}fre.

Lub hauv paus ntawm ntau lawm suav nrog kev txhim kho kev tsim, kev tswj qhov kub thiab qhov zoo, vuam / zaj duab xis zoo thiab kev tswj kev ntxhov siab. Rau tuab-walled/siab- cov raj loj, puag ncig- rau- square transformation yog nyiam; thaum rau nyias-walled/loj- nplai ntau lawm, kev tsim ncaj qha tau txais yuav.

(1) Round-rau-Rectangular forming Method (Seamless / Thick-Walled Preferred)
Siv seamless round kav los yog welded round kav raws li cov khoom siv raw, los ntawm ntau dhau ntawm dov tuag los pwm, los ntawm puag ncig → elliptical → elongated round → square / rectangular, lub perimeter tseem tsis tau hloov, thiab cov hlau yas deformation ua tiav seem hloov dua siab tshiab.

- Txheej txheem Flow:

1. Kev npaj raw khoom: Xaiv tsim nyog seamless puag ncig cov kav dej (xws li 20#, Q355B) los yog loj - txoj kab uas hla welded kav, ua qhov tsis pom kev, tshem tawm xeb, thiab ncaj.
2. Cua sov (yeem): Thaum tshav kub kub tuab- cov kav dej ntawm phab ntsa rau 800-950℃(txhim kho plasticity, tiv thaiv kev tawg).
3. Ua ntej-forming:Progressive compression los ntawm ntau txheej ntawm dov tuag, cov yeeb nkab puag ncig hloov mus rau elliptical, elongated ncig, uniform phab ntsa thinning, thiab ces kaum ua ntej - nias.
4. Square Rectangular txoj kev:Qhov tshwj xeeb- hom dov tuag los yog pwm, maj mam nias lub 4 fab mus rau 90 degree, tswj cov ntug ntev, kab pheeb ces kaum, thiab phab ntsa thickness uniformly.
5. Diameter Control thiab Shaping:Fine dov / straightening tshuab, qhov loj me, ncaj, distortion, tswj lub kaum sab xis R (feem ntau R Tsawg dua lossis sib npaug ntawm 1.5 × phab ntsa thickness).
6. Cua txias:Cua txias los yog dej txias (tswj txias ceev, tiv thaiv kev ntxhov siab tawg).
7. Finishing thiab Flaw Detection:Txiav rau qhov ntev, flatten, polish; UT / MT qhov teeb meem nrhiav pom, ntsuas qhov loj me, phab ntsa thickness, hardness.

- Nta:

Tsis muaj vuam seam, siab zog, niaj hnub phab ntsa thickness, zoo kaum zoo; haum rau tuab- cov kav dej uas muaj qhov ntev 200 × 200-400 × 400mm thiab phab ntsa tuab 10-40mm; efficiency yog qis dua li kev sib sau ncaj qha.

(2) Direct Forming Method (Steel Strip Rolling + High Frequency Vuam, nyias phab ntsa / Batch Production nyiam)

Kub dov / txias dov steel strips undergo winding, flattening, thiab ntau cov txheej txheem dov los ua U → O → square / rectangular duab. Tom qab ntawd lawv tau welded ua ke siv high- zaus induction vuam, thiab cov txheej txheem tau ua tas li.

- Txheej txheem Flow:

1. Unwinding thiab Straightening:Unwind lub steel sawb, txiav thiab welded nws, thiab ncaj nws kom tshem tawm cov nthwv dej / riam khoov.
2. Ua ntej-bending forming:  Ntau txoj kev sib tw maj mam khoov cov hlau sawb rau hauv U zoo → O zoo li daim duab, nrog cov ntug ncaj nraim.
3. High Frequency Vuam:Siv siab - zaus tam sim no (200–450 kHz) kom sov cov npoo kom yaj, thiab siv cov chais extrusion los txuas lawv ua ke. Tshem tawm cov burrs sab nraud ( puab burrs tuaj yeem raug tshem tawm raws li qhov xav tau).
4. Cua txias:Cov seem vuam yog txias nrog dej, txo qhov kub kom qis dua li ntawm 100 degree.
5. Square Rectangular txoj kev:O-zoo li tus billets nkag mus rau hauv cov square/rectangular forming cov menyuam pawg, qhov twg plaub lub ces kaum yuav maj mam khoov mus rau 90 degree, tswj qhov ntev, kab pheeb ces kaum, thiab verticality.
6. Diameter Control thiab Straightening:Cov yob zoo yob tswj txoj kab uas hla, thiab lub tshuab straightening kho qhov ncaj thiab twist, tswj qhov flatness thiab verticality.
7. Tsis Siv Neeg Txiav rau Ntev:Txiav raws li qhov ntev, nrog lub taub hau tiaj tus thiab deburring.
8. Kev tshuaj xyuas Precision:Kev kho deg, kuaj pom qhov tsis zoo, ntsuas qhov loj / cov cuab yeej cuab tam.

- Nta:

Nruam thiab ua tau zoo, tus nqi qis, zoo nto zoo, siab qhov tseeb; haum rau nyias- cov phab ntsa phab ntsa nrog qhov ntev ntawm 200 × 200-500 × 500mm thiab phab ntsa thicknesses ntawm 3-12mm; muaj weld seams, thiab yuav tsum tau nruj nreem nrhiav pom.

(3) Lwm cov txheej txheem pabcuam (cov lus tshwj xeeb / cov khoom me me)
- Kub extrusion:

Round raj billet yog rhuab mus rau 1100-1200 degree, thiab ces tsim rau hauv ib tug square / rectangular zoo los ntawm ib tug tib extrusion nyob rau hauv ib tug tuag; haum rau cov diameters loj heev / tuab phab ntsa / cov ntaub ntawv tshwj xeeb (xws li hlau alloy, stainless hlau), nrog cov nqi siab thiab cov khoom me me.

- Kev kos duab txias / txias dov:

Seamless round raj yog maj mam txo nyob rau hauv txoj kab uas hla thiab zoo li tus square / rectangular zoo los ntawm ntau yam txias txias tuag los yog txias dov yob; high precision, zoo nto, haum rau nruab nrab thiab me diameters nrog siab precision raj.

1. Raw khoom zoo tswj (tiv thaiv qhov tsis xws luag ntawm qhov chaw)

• Kev ua raws li cov khoom siv:Q235B / Q355B / 20 # thiab lwm yam, nrog cov ntawv pov thawj zoo, thiab cov khoom sib xyaw thiab cov khoom siv ua tau raws li cov qauv.
• Nto tsis muaj qhov tsis xws luag:tsis muaj kab nrib pleb, folds, nti, txheej, xeb pits; steel sawb tsis muaj kab mob khoov, wavy npoo, lossis burrs.
• Dimensional stability:Lub ellipticity ntawm lub round raj billet yog tsawg dua los yog sib npaug rau 1.5%, lub thickness kam rau ua ntawm cov hlau sawb yog tsawg dua los yog sib npaug rau ± 0.1 hli; kev ua tau zoo ntawm tib batch ntawm cov ntaub ntawv yog uniform.

2. Kev tswj cov txheej txheem thaum lub sij hawm tsim (tiv thaiv deformation, tawg, tuav qhov ntev)
- Progressive forming:deformation ib kis Tsawg dua lossis sib npaug li 10%, cov ces kaum maj mam khoov (R Ntau dua lossis sib npaug rau 1.2 × phab ntsa tuab), tsis txhob nias rau 90℃ib zaug (tiv thaiv micro tawg ntawm cov ces kaum thiab kev ntxhov siab sab hauv).

- Kev tswj qhov kub thiab txias:

• Cua sov rau puag ncig-rau-square transformation: 800–950 degree, cov cua sov tsis sib xws (qhov kub sib txawv tsawg dua los yog sib npaug li 50 degree), tiv thaiv cov cua sov hauv zos thiab overburning.
• High- vuam zaus: vuam kub 1350-1450 degree, tam sim no / voltage sib piv, vuam ceev sib npaug nrog cov cua sov (tiv thaiv qhov vuam cuav, hlawv- dhau, ntau dhau burrs).
• Kev txias txias: segmented kub tswj, dej txias tom qab vuam Tsawg dua los yog sib npaug li 100 degree, feem ntau yog cua txias rau tuab - cov kav dej (tiv thaiv cia txias thiab tawg).

- Dimension raug:
- Ntug ntev kam rau ua: ± 0.5–1.0mm (nyob ntawm qhov tshwj xeeb), kab pheeb ces kaum sib txawv Tsawg dua lossis sib npaug li 1.5mm, perpendicularity Tsawg dua lossis sib npaug li 0.5℃.
- Phab ntsa thickness uniformity: sib txawv tsawg dua los yog sib npaug rau ± 8%, kaum phab ntsa thickness Ntau dua los yog sib npaug rau 90% ntawm sab (tiv thaiv tsis txaus lub zog ntawm cov ces kaum).
- Kev Ncaj Ncees: Tsawg dua lossis sib npaug li 1.5mm / m, twist℃Tsawg dua lossis sib npaug li 1℃/ m (kev kho kom zoo los ntawm lub tshuab ncaj).

3. Weld Quality Control (Core ntawm Direct Forming Method)
- Welding Parameters: Sib piv ntawm siab- zaus zog, zaus, thiab vuam ceev, txaus ntug melting, zoo extrusion, tsis muaj cuav welding, slag inclusion, pores, los yog hlawv- los ntawm.
- Ntug Finishing: Ua kom tiav kev tshem tawm cov burrs sab nraud (kev hloov pauv zoo), sab hauv burrs Tsawg dua lossis sib npaug li 0.5 hli (burrs ntawm siab- siab / ntws yeeb nkab yuav tsum tau muab tshem tawm).
- Weld Inspection: 100% eddy tam sim no + ultrasonic soj ntsuam, raws li GB/T 11345 Qib II lossis API 5L cov qauv.

4. Surface Quality Control (Anti-scuffing, Anti- oxidation, Preservation ntawm tsos)
- Roller deg mob: Cov txheej txheem rau cov menyuam thiab cov ntawv qhia cov menyuam yog du (Ra tsawg dua lossis sib npaug li 1.6), tsis muaj kab nrib pleb, tsis muaj steel adhesion, thiab tsis tu ncua polished kom tsis txhob muaj khawb thiab indentations.
- Lubrication thiab txias: Cov cheeb tsam tsim siv emulsions / tshwj xeeb lubricants, kom txias, txo kev sib txhuam, thiab tiv thaiv oxidation; welding cheeb tsam yog kev tiv thaiv nrog kev tiv thaiv gases (argon / nitrogen) los tiv thaiv weld oxidation.
- Nto tu: Tshem tawm cov nplais oxide, vuam slag, roj stains, thiab burrs; stainless hlau kav yuav tsum yog cov kua qaub- ntxuav kom passivation, thiab cov pa roj carbon steel kav yuav raug tua - blasted los yog sandblasted.

5. Residual Stress thiab Straightening Control (Tswj Tom Qab Deformation/Cracking)
- Kev Tso Tawm Kev Nyuaj Siab: Rau tuab- phab ntsa / siab- lub zog steel (Q355 thiab siab dua), tom qab- ua kom muaj kev ntxhov siab annealing (tuav ntawm 550-650℃rau 2-4 teev, huab cua txias) yog ua los tshem tawm cov kev ntxhov siab tom qab kev sib sau thiab deformation, tiv thaiv corrosion, tawg,
- Txoj Kev Ncaj Ncees: Cov menyuam ncaj ncaj yog txoj hauv kev tseem ceeb, ntxiv los ntawm kev ncaj ncaj; qhov sib nrug, lub kaum sab xis, thiab lub siab ntawm cov chais ncaj nraim yog qhov sib luag (qhov me me heev ua rau muaj kev puas tsuaj rau saum npoo, nplooj loj dhau los ntawm kev ntxhov siab); Hauv zos deformation yog raug kho los ntawm kev siv xovxwm kom tsis txhob muaj qhov ncaj ncaj.

6. Kev tshuaj xyuas thiab kev tswj xyuas lub Hoobkas (Quality Closed Loop)
- Dimensional Inspection: Ntsuas cov ntug ntev, phab ntsa thickness, kab pheeb ces kaum, ncaj, thiab distortion rau txhua yeeb nkab. Siv laser diam gauge / vernier caliper / qib.
- Tsis yog-Kev kuaj kev puas tsuaj: 100% UT / ET rau welds, UT / MT rau cov khoom siv hauv paus (rau tuab- cov kav dej muaj phab ntsa).
- Mechanical Properties: Siv cov qauv los ntawm txhua pawg rau tensile, dabtsi yog khoov, thiab kev ntsuam xyuas cuam tshuam, raws li GB/T 6728/GB/T 17200.
- Kev Tshuaj Xyuas Nto: Kev tshuaj xyuas qhov muag + kev tshuaj xyuas cov khoom sib nqus (rau cov ntawv thov tseem ceeb). Tsis muaj kab nrib pleb, khawb, xeb, lossis deformation.

• Corner cracking:Ua rau → Ntau dhau deformation nyob rau hauv ib qho mus, me me R tus nqi, tsis tshua muaj kub, khoom nyuaj; Kev tiv thaiv → Progressive forming, R Ntau dua los yog sib npaug ntawm 1.2 × phab ntsa thickness, tuab phab ntsa cua sov, kev ntxhov siab annealing.
• Vuam tsis xws luag (welding tsis tag nrho fused los yog hlawv-los ntawm):Ua rau → Tsis txaus / siab zaus zog, ceev heev / qeeb vuam ceev, tsis raug ntug kev sib dhos; Kev tiv thaiv → Parameter sib txuam, kev sib dhos meej, ruaj khov vuam ceev.
• Dimension deviations (sab ntev / lub kaum sab xis / txoj kab ncaj nraim):Ua rau → Hnav / offset ntawm kev sib sau yob, tsis raug ncaj nraim, tsis sib xws; Kev tiv thaiv → Tsis tu ncua calibration ntawm yob poob lawm, kev kho kom haum ntawm kev ncaj, kev ua kom txias txias.
• Surface khawb /indentations:Ua rau → Rough yob nto / steel adhesion, cov khoom txawv teb chaws nkag mus, coj cov menyuam jamming; Kev Tiv Thaiv → Polish yob nto, cov kab ntau lawm huv si, kev tshuaj xyuas tsis tu ncua ntawm cov ntawv qhia chais.
• Residual stress deformation:Ua rau → Unannealed, txias txias heev, ncaj qha ntau dhau; Kev tiv thaiv → Stress relief annealing, segmented kub tswj, ncaj ncaj.

Lub hauv paus loj ntawm - txoj kab uas hla square thiab lub raj raj ntau lawm yog nyob rau hauv "kev tsim maj mam, qhov kub thiab txias tswj, txhim khu kev qha welds, huv si saum npoo, tso tawm kev ntxhov siab, thiab kev tshuaj xyuas meej". Kev hloov pauv ntawm puag ncig mus rau square yog tsim rau tuab -walled / seamless siab- xav tau scenarios, thaum txoj kev ncaj nraim yog tsim rau nyias -walled / siab- ntim npaum li cas.

Thaum lub sijhawm tsim khoom, kev tswj xyuas nruj yuav tsum tau ua rau tag nrho cov txheej txheem suav nrog cov khoom siv raw, tsim, vuam, cua txias, ncaj, thiab qhov tsis zoo kom tsis txhob muaj cov kab nrib pleb, vuam tsis tiav, qhov sib txawv me me, qhov tsis xws luag, thiab cov teeb meem kev ntxhov siab nyob.