The back up roll ke moqolo o tšehetsang mosebetsirola'me ke rolo e kholo ka ho fetisisa le e boima ka ho fetisisa e sebelisoang ho liloala.Therolae ka tšehetsa lipakengrolaka morero oa ho qoba ho kheloha moqolo oa mosebetsi le ho ama ka lihlahisoa le boleng ba poleiti le hlobolisa leloala rolling.Litšobotsi tsa boleng ba "backup roll" ke boima bo phahameng ba bokaholimo, ho tiea ho hotle, 'mele o thata o thata, matla a matle le ho tiea ha molala le 'mele oa roll."backup roll" e na le khanyetso e phahameng ea ho roala le ho hanyetsa ho phunya, ho thibela likotsi tse matla.Meqolo ea tšepe e entsoeng ka 1000mm kapa ka tlase e entsoe ka 86CrMoV7 le 9Cr2Mo.Khabone ea eona ke 0.80% ho isa ho 0.95% le Cr content ke 2%.E ka sebelisoa bakeng sa tshilo e nyane.Li-backup rolls tsa Cr4 le Cr5 li na le carbon content ea 0.4% ho ea ho 0.6% le Cr content ea 4% ho isa ho 5%, e loketseng lirolo tsa tšepe tsa lebelo le phahameng le halofo ea lebelo le phahameng.

Bakeng sa limilone tse ling tse nyane, meqolo ea tšepe e entsoeng ka tšepe ea 1000mm kapa ka tlase e entsoe ka 86CrMoV7 le 9Cr2Mo, khabone ea eona ke 0.80% ho isa ho 0.95% mme litaba tsa Cr ke 2%.
Litšepe tsa li-backup rolls tsa Cr4 le Cr5 li na le carbon content ea 0.4% ho ea ho 0.6% le Cr content ea 4% ho isa ho 5%.Ho thatafala, ho se mamelle, ho ebola, ho hana mokhathala le ho thibela likotsi tsa li-backup rolls ha e le hantle li felisa ho phunya ha bokaholimo ba 'mele le kotsi ea ho khaola ha roll.Cr4, li-rolls tsa tšepe tsa Cr5 li loketse lirolo tsa tšepe tse lebelo le holimo le lebelo le phahameng.

Litšobotsi tsa "High-speed steel roll" (HSS roll)

1. Lisebelisoa tsa tšepe tsa lebelo le phahameng li na le lisebelisoa tse phahameng tsa alloy tse kang vanadium, tungsten, chromium, molybdenum, le niobium.Mefuta ea li-carbide ka har'a sebopeho sa roll ke haholo-holo MC le M2C.Ha ho bapisoa le meqolo ea tšepe ea ductile e nang le meqolo e phahameng ea nickel-chromium, molumo oa ho feta oa tšepe o phahame nako le nako, o bolokang nako ea ho fetoha ha moqolo, o ntlafatsa ts'ebetso ea leloala le ho fokotsa litšenyehelo tsa tlhahiso.

2. Meqolo ea tšepe e lebelo le phahameng e na le botsitso bo botle ba mocheso.Mocheng oa mocheso, bokaholimo ba moqolo bo na le boima bo phahameng le ho hanyetsa ho apara hantle.
Li-roll tsa tšepe tse lebelo le phahameng li na le boima bo botle, 'me ho thatafala ho tloha holim'a' mele oa moqolo ho ea ka hare ho lera la ho sebetsa ha ho fokotsehe ka seoelo, kahoo ho etsa bonnete ba hore meqolo e na le khanyetso e ntle ea ho apara ho tloha ka ntle ho ea ka hare.

3. Nakong ea tšebeliso ea meqolo ea tšepe e phahameng ka potlako, tlas'a maemo a pholileng a matle, filimi e tšesaane le e teteaneng ea oxide e thehoa holim'a 'mele oa moqolo.Filimi ena ea junifomo, e tšesaane le e teteaneng ea oxide e ka ba teng nako e telele ntle le ho oa, e etsa hore meqolo ea tšepe ea lebelo le phahameng e se ke ea ntlafala haholo.

4. Meqolo ea tšepe ea lebelo le phahameng e na le coefficient e kholo ea ho atolosa thepa le conductivity e ntle ea mocheso.Lirolo tsa HSS li ntse li tsoela pele ho fokotseha ka lebaka la ho atolosoa ha lisebelisoa tsa tšepe tsa lebelo le phahameng ka botsona.Nakong ea ts'ebetso ea ho phunya, phetoho ea groove e nyenyane e nyenyane, 'me ho tsitsa ha boholo ba sekoti ho bolokoa nako e telele, haholo-holo ha ho roala bar kapa rebar, e leng ho leng molemo ho laola mamello e mpe ea thepa ea ho roala.
5. Mokotla oa tšepe ea centrifugally cast high-speed iron roll e entsoe ka tšepe ea alloy ductile, kahoo, matla a molala a matla a matla.

Kopo
Leloala la ho roala li-bar, rack, leloala la terata e lebelo le holimo, leloala le moqotetsane le chesang, karolo le leloala la groove steel rolling mill.