Umlando wemiqulu

Roll ezihlukahlukene kanye nenqubo yokukhiqiza ngenqubekelaphambili yobuchwepheshe metallurgical kanye nokuvela kwensimbi rolling imishini kanye nentuthuko eqhubekayo.Maphakathi nekhulu le-18, iBrithani yaba yingcweti kwezobuchwepheshe bokukhiqiza amaroli ensimbi apholile okugoqa amapuleti ensimbi, futhi engxenyeni yesibili yekhulu le-19, inqubekelaphambili yobuchwepheshe bokwenza insimbi yaseYurophu yadinga ukugingqika kwamathoni amakhulu ama-ingots. namandla ensimbi empunga noma amaroli ensimbi abandayo awakwazanga ukuhlangabezana nezimfuneko.Okuqukethwe kwekhabhoni okungama-0.4% kuya ku-0.6% amaroli ensimbi ajwayelekile azalwa ngokufanele.Ukuvela kwemishini esindayo yokubumba ukuze kuthuthukiswe ukuqina kwamaroli afojiwe alokhu kwakheka.ukusetshenziswa kwezakhi ze-alloying kanye nokwethulwa kokwelashwa kokushisa ekuqaleni kwekhulu lama-20 kwathuthukisa kakhulu ukumelana nokugqokwa kanye nokuqina kwe-cast and forged steel hot rolls nemiqulu ebandayo.Ukwengezwa kwe-molybdenum ukuphonsa amaroli ensimbi eshidi eligoqiwe elishisayo kanye ne-strip kuthuthukisa ikhwalithi engaphezulu yento egoqiwe.Ukuthululelwa okuhlanganisiwe ngendlela yokuhlanza kuthuthukisa kakhulu amandla ayisisekelo ama-cast rolls.

Roll ngenani elikhulu lezinto ze-alloying ngemuva kweMpi Yezwe Yesibili, okuwumphumela wemishini eginqikayo ibheke esikalini esikhulu, esiqhubekayo, esinesivinini esikhulu, ukuthuthukiswa okuzenzakalelayo, kanye namandla wezinto ezibonakalayo, ukumelana nokuguqulwa ukuze kwandiswe ukusebenza kwe-roll. izidingo.Ngalesi sikhathi, kwavela ama-semi-steel rolls kanye nama-ductile iron rolls, kanye nempushanaama-tungsten carbide rollszathuthukiswa ngempumelelo ngemva kweminyaka yawo-1960.ubuchwepheshe be-centrifugal casting kanye nobuchwepheshe bokwelashwa kokushisa okuhlukile kwamaroli kwakhuthazwa kabanzi e-Japan naseYurophu ekuqaleni kwawo-1970, okwathuthukisa kakhulu ukusebenza okuphelele kwama-strip rolls.Amaroli ensimbi ayinhlanganisela ephezulu ye-chromium nawo asetshenziswa ngempumelelo ezigayweni ezishisayo.Ngaso leso sikhathi, kwasetshenziswa insimbi emhlophe ekhiqiziwe kanye ne-semi-steel rolls eJapan.I-Europe yama-80s kanye nokwethulwa kwamaroli ensimbi e-chromium ephezulu kanye nongqimba oluqinile oluqinile lwamaroli abandayo namaroli ensimbi ayisipesheli engxubevange yezingxenye ezincane kanye nokuqedwa kwezintambo zocingo.Ukuthuthukiswa kobuchwepheshe besimanje bokugoqa insimbi kuye kwaholela ekuthuthukisweni kwemiqulu yokusebenza ephezulu.Ukusetshenziswa kwe-centrifugal casting kanye nezindlela ezintsha eziyinhlanganisela ezifana nendlela eqhubekayo yokuphonsa eyinhlanganisela (indlela ye-CPC), indlela ye-jet deposition (indlela ye-Osprey), indlela ye-electroslag welding kanye nendlela yokucindezela ye-isostatic eshisayo ukukhiqiza umnyombo wokuqina okuhle kwensimbi ehlanganisiwe noma i-ductile iron, ungqimba lwangaphandle lochungechunge lwensimbi enesivinini esikhulu lwamaroli ayinhlanganisela namaroli e-ceramic ensimbi asetshenziswe e-Europe, e-Japan, isizukulwane esisha samaphrofayili, izintambo zocingo, izigayo zokuhluthula.

I-China yaqala ukukhiqiza ama-cast roll ngamaqoqo kusukela ngo-1930s, kodwa kwakunezinhlobo ezimbalwa kakhulu.uchwepheshe wokuqalai-tungsten carbide rollIsitshalo sasungulwa eXingtai, eHebei ngasekupheleni kwawo-1950.ngo-1958, i-Anshan Iron and Steel Company yenza isilingo sokuqala samazwe ngamazwe futhi yasebenzisa ama-ductile iron rolls amakhulu ku-1050 primary rolling.ngawo-1960, amaroli abandayo kanye namaroli amakhulu ensimbi akhiwe akhiqizwa ngempumelelo.ngasekupheleni kwawo-1970, i-Taiyuan Iron and Steel Company futhi Ngasekupheleni kweminyaka yama-70's, i-Taiyuan Iron and Steel Company kanye ne-Beijing Iron and Steel Research Institute ngokuhlanganyela bakhiqiza amaroli ensimbi ayi-centrifugal omshini wokugawula ikhoyili yesithando somlilo kanye neyunithi yokugoqa yensimbi ye-broadband eqhubekayo, kanye I-Xingtai Metallurgical Machinery Roll Co. nezinye izinhlobo ezintsha.Ngawo-1990, ukukhiqizwa kwe-roll yaseShayina sekuhlangabezane nezidingo zasekhaya futhi ingxenye ethile yathunyelwa kwamanye amazwe, kodwa izinhlobonhlobo kufanele zandiswe futhi izinga kufanele lithuthukiswe.