Cold-formed yeeb nkab: piav qhia, GOST thiab nta

2024 Tus sau: Howard Calhoun | [email protected]. Kawg hloov kho: 2023-12-17 10:28

Cov yeeb nkab txias tau pom nws daim ntawv thov dav hauv kev tsim kho thiab hauv ntau thaj chaw ntawm tib neeg kev ua haujlwm. Nrog kev pab los ntawm nws, qhov chaw rau cov rooj tog tsim khoom tsim, dej, roj, roj pipelines yog nteg, raws li zoo raws li engineering tes hauj lwm, ntawm lawv cov uas tsim los rau cov twj aggressive ib puag ncig. Cov khoom uas tau hais los no yog cov khoom siv ruaj khov heev, lawv tsis muaj seam, yog li qhov kev nthuav dav kuj txuas mus rau kev lag luam aviation, nrog rau kev lag luam tsheb.

Pipe Description

Txoj kev paub koj tus kheej nrog lub xeev cov qauv, koj tuaj yeem nkag siab tias cov yeeb nkab txias txias yog cov pas nrig hollow, uas tsis muaj welds thiab pob qij txha. Kev tsim tshuab tuaj yeem sib txawv, thiab nws tuaj yeem faib ua ntau hom, ntawm lawv:

• nias;
• forging;
• rolling;
• dawb.

Txoj kev uas feem ntau yog dov. Cov yeeb nkab yog siv los ua cov khoom ua haujlwm,uas yog tsim los ntawm kub dov. Hlau yog dov siv cov cuab yeej tshwj xeeb. Cov yeeb nkab txias yog ua los ntawm cov pa roj carbon lossis hlau alloy. Vim qhov tseeb tias cov khoom tau piav qhia tsis muaj seams, qhov no tso cai rau lawv siv rau hauv cov xwm txheej tsis zoo thiab nyob rau hauv kev ntxhov siab.

Hais txog qhov loj me, cov kav dej no me dua li cov kav dej kub dov los yog cov kav dej welded. Txawm li cas los xij, ib qho txiaj ntsig tseem ceeb tuaj yeem txheeb xyuas, uas yog qhov tseeb qhov tseeb. Cov khoom muaj ib tug nto, qhov zoo ntawm uas yog ntau dua nyob rau hauv kev sib piv nrog rau cov kav dej ua siv lwm yam technologies. Txias txoj kev tsim cov phab ntsa nyias.

Cov yam ntxwv tseem ceeb: kev faib tawm los ntawm qhov tsis muaj

Cov yeeb nkab txias tuaj yeem faib los ntawm phab ntsa tuab thiab tuaj yeem ua nyias-walled lossis tuab-walled. Ntawm no nyob ntawm tsis kam mus rau qhov tsis zoo influences thiab lub zog. Nyias-walled seamless yeeb nkab yog lub teeb yuag. Cov cuab yeej no yog nyob rau hauv kev thov nyob rau hauv kev tsim kho ntawm cov qauv uas tsis yog-tus qauv. Raws li rau lub thickness, nws yuav ua tau los ntawm 4 mus rau 6 hli. Txawm li cas los xij, yog tias tsim nyog siv cov yeeb nkab nrog cov phab ntsa tuab uas txawv ntawm cov lus hais, cov khoom siv nrog cov phab ntsa mus txog 12 hli tuab tuaj yeem tsim hauv ntau lawm. Lawv yog cov muaj zog heev.

Txoj kab uas hla ua raws li ib qho ntawm qhov tseem ceeb, nws tuaj yeem sib npaug ntawm tus nqi ntawm 5 txog 45 cm. Txias-tsim steel yeeb nkab tuaj yeemkuj tseem muaj qhov sib txawv, uas yog:

• oval;
• ncig;
• rectangular;
• square.

Tus yam ntxwv ntxiv yog qhov ntev. Cov kav dej tuaj yeem ntsuas los yog tsis-dimensional. Qhov ntsuas ntev yog 4, 5 lossis 5 m. Yog tias koj xav tau cov kav dej ntawm qhov ntev, ces koj tuaj yeem xaiv ntu ntawm 1.5 txog 11.5 m.

xeev Standards

Cold-formed yeeb nkab (GOST 8734-75) kuj tuaj yeem raug cais raws li txoj kev siv. Cov khoom zoo li no yuav muaj lub hom phiaj tshwj xeeb lossis dav dav. Qhov kev xaiv tom kawg tuaj yeem muaj txoj kab nruab nrab ntawm 5 txog 250 hli, thaum phab ntsa tuab feem ntau yog 0.3 txog 24 hli.

Cov kav dej tuaj yeem muaj cov phab ntsa sib txawv thiab yog:

• tshwj xeeb tuab-walled;
• thin-walled;
• thick-walled;
• tshwj xeeb nyias-walled.

Rau cov khoom no, muaj cov kev qhia tshwj xeeb uas tau sau tseg hauv xeev cov qauv 8733-74. Cov ntaub ntawv hais txog cov khoom lag luam tuaj yeem muab faib ua pawg sib cais, ntawm lawv yog cov ntawv sau los ntawm B rau E. Thawj pab pawg yog cov kev cai ntawm cov tshuaj muaj pes tsawg leeg, pawg C yog cov kev cai ntawm cov khoom siv kho tshuab. Pawg G txiav txim siab qhov kev faib tawm ntawm cov khoom siv kho tshuab thiab tshuaj lom neeg muaj pes tsawg leeg.

Yog tias cov yeeb nkab yog nyob rau hauv pawg D, qhov no qhia txog qhov normalization ntawm hydraulic siab. Mechanical zog yog normalized tom qab kev kho cua sov ntawm cov kav dej, uas muaj feem xyuam raupab pawg E. Seamless txias-tsim steel kav raug tswj xyuas tom qab tsim khoom. Kev tshuaj xyuas muaj xws li sizing, hydraulic siab kuaj thiab txhua yam khoom tswj. Cov khoom siv ntxiv raug kuaj rau khoov thiab flattening, siv GOST 3728-78 thiab 8695-77.

Ntxiv nta

Cold form yeeb nkab yog tsim tsis muaj vuam. Ntau lawm tsis muab rau preheating, vim hais tias cov khoom yog tau los ntawm lub workpiece. Deviations yog normalized los ntawm GOST 8734-75. Muaj qhov tso cai sib txawv ntawm tus qauv, uas yog 10 hli. Raws li cov specifications, qhov sib txawv ntawm phab ntsa thickness thiab ovality yuav tsum tsis txhob tshaj qhov txwv qhov tseem ceeb.

Qhov curvature ntawm seem yog 3 hli, uas yog qhov tseeb rau ib ntu 1 m ntev. Qhov no, peb tab tom tham txog txoj kab uas hla ntawm 4 mus rau 8 hli. Tso cai curvature txo mus rau 2 hli thaum txoj kab uas hla ntawm 8 thiab 10 hli.

Cov khoom ntawm cov khoom siv capillary

Cov kav dej Capillary yog tsim raws li GOST 14162-79. Steel qib 12X18H10T yog siv rau ntau lawm. Cov kav dej zoo li no tau muab piv nrog cov hlau. Lawv qhov txawv yog:

• corrosion resistance;
• txhua lub zog;
• durability.

Cov kav dej txias tsis zoo li no, GOST uas tau hais los saum no, tuaj yeem siv rau hauv ib puag ncig hnyav. Kev tsim tshuab tso cai rau koj kom tau txaiscov kav dej nrog kev ua haujlwm siab. Kev tsim khoom yog ua raws li kev kho mob sulfuric acid, uas txo cov kev ntxhov siab sab hauv. Qhov no txhim kho kev nyab xeeb kev ua haujlwm hauv kev lag luam roj, tshuaj thiab roj.

Cov yeeb nkab txias-tsim steel yeeb nkab, GOST, uas yuav tsum tau ua raws, muaj ib qho tsis zoo, qhia txog qhov nyuaj ntawm cov txheej txheem thev naus laus zis. Qhov tshwm sim yog nce tus nqi thiab tus nqi kawg, nrog rau kev ncua sij hawm ntau lawm.

Lub hom phiaj tshwj xeeb yeeb nkab nta

Ntawm cov khoom lag luam uas tsis muaj seamless, ib qho yuav tsum tau ua los ntawm cov hlau tsis muaj zog, nrog rau cov khoom siv uas tuaj yeem raug siab. Lwm ntau yam yog steel capillary yeeb nkab nrog ib lub cheeb me me. Yog tias koj txaus siab rau cov kav dej nrog cov khoom tiv thaiv corrosion, ces koj yuav tsum paub tias lawv tau tsim nyob rau hauv raws li GOST 9941-81. Cov ntaub ntawv muaj cov lus qhia tshwj xeeb thiab ntau yam.

Phab ntsa tuab ntawm cov yeeb nkab no tuaj yeem sib npaug ntawm tus nqi ntawm 0.3 txog 24 hli. Raws li rau sab nraud txoj kab uas hla, nws qhov siab tshaj plaws txwv yog 250 mm. Qhov tsawg tshaj plaws tus nqi yog 5 mm. Nws yog ua los ntawm high-alloy corrosion-resistant steel. Cov khoom raug raug sim tib yam li cov kav dej dav dav. Nrog lawv cov kev pab, kev tso cov raj xa dej siv rau kev thauj mus los ntawm cov khoom siv nrog cov qib siab ntawm aggressiveness yog nqa tawm. Cov kua dej uas tau tso tawm tuaj yeem yog qhov kub thiab txias. Lwm tusCov kev taw qhia ntawm kev lag luam yog turbojet thiab dav hlau cav, uas yog siv los muab oxidizer, roj thiab roj.

GOST siab resistant kav

Seamless txias-formed kav (GOST 11017-80) tuaj yeem siv rau ntawm qhov siab. Lawv txoj kab uas hla yog sib npaug rau daim duab los ntawm 6 mus rau 10 mm. Lub hauv paus yog carbon structural steel. Cov khoom raug kuaj txawv ntawm cov uas tau hais los saum no. Cov kav dej raug sim rau hydraulic siab thiab ncab, tuav lub sijhawm ncav cuag 10 vib nas this. Qhov chaw siv yog roj av thiab diesel xyaw, uas tseem hu ua roj kab.

Nyob hauv kaw

Qhov saum npoo ntawm cov kav dej txias yuav tsum tsis muaj qhov tawg thiab puas, nrog rau cov hnub poob thiab lwm yam tsis xws luag. Tso cai teev, me me nicks thiab lwm yam irregularities uas tsis cuam tshuam nrog kev soj ntsuam. Yog tias tsim nyog, qhov saum npoo yog ntxuav ntawm nplai.

Cov yeeb nkab raug txiav ntawm lub kaum sab xis. Burrs raug tshem tawm ntawm qhov kawg. Ntawm qhov kev thov ntawm cov neeg siv khoom, qhov kawg ntawm cov kav dej tuaj yeem ua tiav nrog chamfers. Txoj cai no yog muab rau cov yeeb nkab uas nws phab ntsa thickness tshaj 5 hli. Ib qho xwm txheej tseem ceeb tau qhia nyob rau hauv lub xub ntiag ntawm lub nplhaib kawg nrog qhov dav ntawm 1 txog 3 hli.