Inkqubo yokuvelisa i-hot-rolled steel coil yeyona nto ibalulekileyo ekuvelisweni kwentsimbi. Ngokuyintloko yenza i-billet yentsimbi ibe yimo yepleyiti efunekayo ngokuqengqeleka ngobushushu obuphezulu. Nazi izinto eziphambili ekufuneka zenziwe:
Ukulungiswa kwezinto eziluhlaza
Sebenzisa i-billet eqhubekayo yokuphosa okanye i-billet yokuqala yokuqengqeleka njengezinto eziluhlaza, kwaye ubukhulu be-billet buhlala buyi-150-300mm.
I-billet iyacocwa ngaphezulu (njengokucoca ilangatye okanye ukugaya ngoomatshini) ukuze kususwe isikali se-oxide kunye neziphene ukuqinisekisa umgangatho wokuqengqeleka.
Ukufudumeza
I-billet ithunyelwa kwisithando sobushushu esinomthi oqingqiweyo kwaye ifudunyezwe ukuya kwi-1100-1300℃ ukuze i-billet ifikelele kubushushu obuyi-austenitizing kwaye iphucule i-plasticity.
Lawula ixesha lokufudumeza kunye nokulingana kobushushu ukuze uphephe ukutsha kakhulu okanye ubushushu obaneleyo.
Ukuqengqeleka Okurhabaxa
Ubukhulu be-billet buncitshiswa bube yi-30-50mm ngokusebenzisa i-rough rolling mill eguqukayo (njenge-two-roll okanye i-four-roll mill) ukuze kwenziwe i-intermediate billet.
Ukususwa kwamanzi ngoxinzelelo oluphezulu kunokwenziwa emva kokudlula ngakunye ukuze kususwe umaleko we-oxide engaphezulu.
Ukugqiba ukuqengqeleka
I-billet ephakathi ingena kwi-finning mill (ngesiqhelo ii-6-7 four-roll okanye ii-six-roll mills), kwaye incitshiswa kancinci kancinci ukuya kubukhulu obujoliswe kuyo (njenge-1.2-25mm) ngokuqengqeleka okuqhubekayo.
I-AGC (ulawulo lokutyeba oluzenzekelayo) kunye nenkqubo yolawulo lwemilo yepleyiti zisetyenziselwa ukuqinisekisa ukuchaneka kobukhulu kunye nokuthe tye kwemilo yepleyiti.
Iirola kufuneka zipholiswe kwaye zithanjiswe ngethambiso ngexesha lokuqengqeleka ukuthintela ukuguquka kobushushu kunye nokuguguleka.
Ukupholisa
Inkqubo yokupholisa yelaminar isetyenziselwa ukupholisa ngokukhawuleza umcu wentsimbi ukusuka kubushushu bokugqibela bokuqengqeleka (malunga ne-800℃) ukuya kubushushu begumbi ngokulawula umthamo wamanzi kunye nesantya sokupholisa (njenge-30-50℃/s).
Inkqubo yokupholisa ichaphazela ngokuthe ngqo isakhiwo esincinci (njenge-ferrite kunye ne-pearlite ratio) kunye neempawu zoomatshini ze-coil yentsimbi.
Ukujijeka
Umcu wentsimbi ujikeleziswa kwikhoyili yentsimbi nge-pinch roller kunye ne-coiler, kwaye uxinzelelo lulawulwa kwi-100-500N/mm² ukuqinisekisa ukuba imilo yekhoyili iqinile kwaye akukho khoyili ikhululekileyo.
Ubushushu bokujiya buhlala bulawulwa kwi-550-700℃ ukuze kuphuculwe ukusebenza.
Unyango Olulandelayo
Unyango lomphezulu: ukucola ukususa isikali se-oxide, okanye i-galvanizing, i-aluminium plating kunye nezinye iindlela zokugquma.
Ukuqokelela: kuphucula ukuqina kwezinto (njengokutsalwa kwakhona kwekristale ngaphambi kokuqengqeleka okubandayo).
Ukuthambisa: ukususa iqonga lemveliso kunye nokuphucula ukugqitywa komphezulu ngokuqengqeleka okuncinci kwesantya sokunciphisa.
Ukuhlolwa komgangatho kunye nokupakishwa: jonga ubungakanani, iimpawu zoomatshini kunye nomgangatho womphezulu, uze uqengqele, uhlanganise kwaye uphawule ngokweemfuno zabathengi.