Hla dov yog ib txoj kev dov ntawm longitudinal dov thiab hla dov. Lub dov ntawm lub dov daim rotates raws nws tus kheej axis, deforms thiab nce qib ntawm ob los yog peb yob uas nws longitudinal axes sib tshuam (los yog incline) nyob rau hauv tib txoj kev sib hloov. Hla dov feem ntau yog siv rau kev tho thiab dov ntawm cov kav dej (xws li kev tsim cov kav dej kub-expanded seamless), thiab ntu ntu dov ntawm cov pob steel.

Txoj kev hla-dov tau siv dav hauv cov txheej txheem ntawm cov kav dej kub-expanded seamless. Ntxiv nrog rau cov txheej txheem thermal expansion tseem ceeb ntawm kev tho, nws kuj yog siv rau hauv dov, leveling, sizing, elongation, expansion thiab spinning, thiab lwm yam hauv cov txheej txheem yooj yim.

Qhov sib txawv ntawm cross dov thiab longitudinal dov thiab cross dov yog feem ntau nyob rau hauv fluidity ntawm hlau. Lub ntsiab kev taw qhia ntawm cov hlau ntws thaum lub sij hawm longitudinal dov yog tib yam li cov yob nto, thiab lub ntsiab kev taw qhia ntawm hlau ntws thaum hla dov yog tib yam li cov yob nto. Hla dov yog nruab nrab ntawm qhov ntev dov thiab hla dov, thiab cov kev taw qhia ntws ntawm cov hlau deformed yog tsim lub kaum sab xis nrog kev taw qhia ntawm kev txav ntawm cov cuab yeej deformation yob, ntxiv rau kev txav mus rau pem hauv ntej, cov hlau kuj tig ncig nws tus kheej axis, uas yog ib tug kauv rau pem hauv ntej txav. Muaj ob hom skew dov mills siv hauv kev tsim khoom: ob-yob thiab peb-yob tshuab.

Cov txheej txheem tho hauv kev tsim cov yeeb nkab kub-expanded seamless steel yeeb nkab yog qhov tsim nyog tshaj niaj hnub no, thiab cov txheej txheem tho tau ua tiav. Tag nrho cov txheej txheem ntawm kev sib tsoo dov tuaj yeem muab faib ua 3 theem:
1. Cov txheej txheem tsis ruaj khov. Cov hlau nyob rau pem hauv ntej kawg ntawm lub raj dawb paug maj mam ua rau lub deformation cheeb tsam theem, uas yog, lub raj dawb paug thiab yob pib hu rau pem hauv ntej hlau thiab tawm ntawm lub deformation cheeb tsam. Nyob rau theem no, muaj thawj tom thiab theem nrab tom.
2. Cov txheej txheem ruaj khov. Qhov no yog lub hauv paus ntsiab lus ntawm cov txheej txheem tho, los ntawm cov hlau nyob rau hauv pem hauv ntej kawg ntawm lub raj dawb paug mus rau lub deformation cheeb tsam kom txog rau thaum cov hlau nyob rau hauv tus Tsov tus tw kawg ntawm lub raj dawb paug pib tawm ntawm lub deformation cheeb tsam.
3. Cov txheej txheem tsis ruaj khov. Cov hlau ntawm qhov kawg ntawm lub raj khoob maj mam tawm ntawm qhov chaw deformation kom txog thaum tag nrho cov hlau tawm ntawm lub yob.

Muaj qhov sib txawv meej ntawm cov txheej txheem ruaj khov thiab cov txheej txheem tsis ruaj khov, uas tuaj yeem pom tau yooj yim hauv cov txheej txheem tsim khoom. Piv txwv li, muaj qhov sib txawv ntawm qhov loj ntawm lub taub hau thiab tus Tsov tus tw thiab qhov nruab nrab ntawm lub capillary. Feem ntau, txoj kab uas hla ntawm lub hauv ntej kawg ntawm lub capillary yog qhov loj, txoj kab uas hla ntawm tus Tsov tus tw kawg yog me me, thiab qhov nruab nrab yog zoo ib yam. Kev sib txawv loj ntawm lub taub hau mus rau tus Tsov tus tw yog ib qho ntawm cov yam ntxwv ntawm cov txheej txheem tsis ruaj khov.

Yog vim li cas rau txoj kab uas hla loj ntawm lub taub hau yog vim hais tias cov hlau nyob rau hauv pem hauv ntej kawg maj mam nyob rau hauv lub deformation cheeb tsam, kev sib txhuam quab yuam nyob rau hauv lub contact nto ntawm cov hlau thiab yob yuav maj mam nce, thiab nws mus txog ib tug siab tshaj plaws tus nqi nyob rau hauv tag nrho deformation. cheeb tsam, tshwj xeeb tshaj yog thaum lub hauv ntej kawg ntawm lub raj billet ntsib lub plug Tib lub sij hawm, vim lub axial tsis kam ntawm lub ntsaws, cov hlau yog resisted nyob rau hauv lub axial extension, thiaj li hais tias lub axial extension deformation yog txo, thiab lateral deformation. yog nce. Tsis tas li ntawd, tsis muaj kev txwv sab nraud, uas ua rau lub taub hau loj. Txoj kab uas hla ntawm tus Tsov tus tw kawg yog me me, vim hais tias thaum tus Tsov tus tw kawg ntawm lub raj khoob yog nkag los ntawm lub ntsaws, qhov kev tiv thaiv ntawm lub ntsaws poob qis heev, thiab nws yog ib qho yooj yim mus cuag thiab deform. Nyob rau tib lub sij hawm, lub lateral dov yog me me, yog li lub sab nraud yog me me.

Lub hauv ntej thiab nram qab jams uas tshwm sim nyob rau hauv ntau lawm kuj yog ib qho ntawm cov yam ntxwv tsis ruaj khov. Txawm hais tias peb cov txheej txheem sib txawv, lawv txhua tus tau pom nyob rau hauv tib qhov chaw deformation. Lub deformation cheeb tsam yog tsim los ntawm yob, ntsaws thiab qhia discs.