I-back up roll ngumqulu oxhasa umsebenzirollkwaye ngowona mqulu mkhulu kwaye unzima osetyenziswa kwizingqusho. Irollinokuxhasa okuphakathirollngenjongo yokuphepha ukuphambuka komqulu womsebenzi kunye nokuchaphazela isivuno kunye nomgangatho wepleyiti kunye ne-strip rolling mill. Iimpawu zomgangatho we-backup roll bubunzima obuphezulu bomphezulu, ukuqina okuhle kunye nokuqina okunzulu komzimba oqengqelekayo, ukomelela okuhle kunye nokuqina kwentamo kunye nomzimba oqengqelekayo. i-backup roll inokumelana nokunxiba okuphezulu kunye nokumelana nokuxobuka, ii-anti-ingozi ezinamandla. Imiqulu yensimbi eyenziweyo ye-1000mm okanye ngaphantsi yenziwe nge-86CrMoV7 kunye ne-9Cr2Mo. Umxholo wayo wekhabhoni ngu-0.80% ukuya kwi-0.95% kunye ne-Cr umxholo we-2%.Ingasetyenziselwa ezinye iincinci ezincinci. I-Cr4 kunye ne-Cr5 i-back up rolls inomxholo wekhabhoni we-0.4% ukuya kwi-0.6% kunye nomxholo we-Cr we-4% ukuya kwi-5%, efanelekileyo kwi-speed-speed steel and semi-high-speed work rolls.

Kwezinye ii-mill ezincinci, i-backup rolls yensimbi eyenziwe nge-1000mm okanye ngaphantsi yenziwe nge-86CrMoV7 kunye ne-9Cr2Mo, umxholo wayo wekhabhoni ngu-0.80% ukuya kwi-0.95% kunye ne-Cr umxholo we-2%.
Intsimbi ye-Cr4 kunye ne-Cr5 i-backup rolls inomxholo wekhabhoni we-0.4% ukuya kwi-0.6% kunye ne-Cr umxholo we-4% ukuya kwi-5%. Ukuqina, ukumelana nokunxiba, ukuxhathisa ukuxobuka, ukudinwa kunye nokuchasana nengozi yeepropathi ze-backup rolls ngokusisiseko zisusa i-penomenon exobukayo ye-roll body surface kunye ne-roll cutoff ngozi. I-Cr4, i-Cr5 i-backup rolls yentsimbi ifanelekile kwintsimbi enesantya esiphezulu kunye ne-semi-high-speed work rolls.

Iimpawu ze-High-speed iron roll (HSS roll)

1. Izinto ezihamba ngesantya esiphezulu zentsimbi ziqulethe izinto eziphezulu ze-alloy ezifana ne-vanadium, i-tungsten, i-chromium, i-molybdenum, kunye ne-niobium. Iindidi ze-carbides kwi-roll structure ziyi-MC kunye ne-M2C. Ukuthelekisa kunye ne-ductile iron rolls kunye ne-high-nickel-chromium rolls, i-volume yokudlula insimbi iphezulu ngexesha ngalinye, eligcina ixesha lokuguqulwa kwe-roll, liphucula ukusebenza kakuhle kwe-mill kunye nokunciphisa iindleko zokuvelisa.

2. Imiqulu yensimbi enesantya esiphezulu inozinzo oluhle lwe-thermal. Kwiqondo lokushisa elijikelezayo, umphezulu we-roll unobunzima obuphezulu kunye nokumelana nokunxiba kakuhle.
Imiqulu yensimbi enesantya esiphezulu inokuqina okuhle, kwaye ubunzima obuvela kumphezulu womzimba ukuya ngaphakathi kwinqanaba lokusebenza abunciphisi, ngaloo ndlela iqinisekisa ukuba imiqulu inokumelana nokunxiba ngokulinganayo ukusuka ngaphandle ukuya ngaphakathi.

3. Ngethuba lokusetyenziswa kweentsimbi ze-speed-speed rolls, phantsi kweemeko zokupholisa kakuhle, ifilimu encinci kunye ne-dense oxide yenziwa ebusweni bomzimba we-roll. Le filimu iyunifomu, ibhityile kunye neshinyeneyo ye-oxide inokubakho ixesha elide ngaphandle kokuwa, isenza ukuba imiqulu yentsimbi enesantya esiphezulu ingagugi iphucuke kakhulu.

4. Imiqulu yensimbi enesantya esiphezulu ine-coefficient enkulu yokwandisa izinto kunye ne-thermal conductivity. Imiqulu ye-HSS iyaqhubeka iyancipha ngenxa yokwandiswa kwezixhobo zetsimbi ezikhawulezayo ngokwazo. Ngethuba lenkqubo yokuguqulwa, ukuguqulwa kwe-groove kuncinci, kwaye ukuhambelana kobungakanani bomngxuma kugcinwa ixesha elide, ngakumbi xa ugoqa ibha okanye i-rebar, ekulungele ngakumbi ukulawula ukunyamezela okungalunganga kwezinto ezijikelezayo.
5. Ingundoqo ye-centrifugally cast high-speed iron roll yenziwe nge-alloy ductile iron, ngoko ke, amandla entamo ye-roll yomelele.

Isicelo
Ibar yokusila, i-splitter rack, i-high-speed wire finishing mill, i-hot-rolled striping mill finishing mill, icandelo kunye ne-groove steel rolling mill.