I-backup roll ingumqulu osekela umsebenzigingqafuthi iwumqulu omkhulu kunawo wonke futhi osinda kakhulu osetshenziswa ezigayweni. Igingqaingasekela okuphakathigingqangenhloso yokugwema ukuchezuka komqulu wokusebenza futhi kuthinte isivuno kanye nekhwalithi yepuleti ne-strip rolling mill. Izici zekhwalithi zomqulu oyisipele wukuqina okuphezulu kwendawo, ukufana okuhle kokuqina kanye nongqimba olujulile oluqinile lwe-roll yomzimba, amandla amahle kanye nokuqina kwe-roll neck kanye nomzimba we-roll. umqulu oyisipele unokumelana nokugqokwa okuphezulu nokumelana nokuxebuka, izivimbelo eziqinile zokulwa nezingozi. Amaroli ensimbi akhiwe ngo-1000mm noma ngaphansi enziwe nge-86CrMoV7 kanye ne-9Cr2Mo. Okuqukethwe kwekhabhoni yayo kungu-0.80% kuya ku-0.95% kanti okuqukethwe kwe-Cr kungu-2%.Ingasetshenziselwa izigayo ezincane. Ama-backup rolls e-Cr4 kanye ne-Cr5 anokuqukethwe kwekhabhoni okungu-0.4% kuya ku-0.6% kanye nokuqukethwe kwe-Cr okungama-4% kuya ku-5%, afanele amaroli ensimbi anesivinini esikhulu kanye ne-semi-speed ephezulu.

Kwezinye izigayo ezincane, amaroli ensimbi enziwe mbumbulu angu-1000mm noma ngaphansi enziwe nge-86CrMoV7 kanye ne-9Cr2Mo, okuqukethwe kwawo kwekhabhoni kungu-0.80% kuya ku-0.95% kanti okuqukethwe kwe-Cr kungu-2%.
Insimbi yama-backup rolls e-Cr4 kanye ne-Cr5 inokuqukethwe kwekhabhoni okungu-0.4% kuya ku-0.6% kanye nokuqukethwe kwe-Cr okungu-4% kuya ku-5%. Ukuqina, ukumelana nokuguga, ukumelana nokuxebuka, ukumelana nokukhathala kanye nezindawo zokulwa nengozi zamaroli ayisipele ngokuyisisekelo aqeda ukuxebuka kwendawo yomzimba we-roll kanye nengozi yokunqamuka kwe-roll. I-Cr4, i-Cr5 steel backup rolls ifanele insimbi enesivinini esikhulu kanye namaroli okusebenza ensimbi anesivinini esiphezulu.

Izici ze-High-speed steel roll (i-HSS roll)

1. Izinto zokwenziwa kwensimbi enesivinini esikhulu ziqukethe izakhi ze-alloy eziphezulu njenge-vanadium, i-tungsten, i-chromium, i-molybdenum, ne-niobium. Izinhlobo zama-carbides esakhiweni se-roll ikakhulukazi i-MC ne-M2C. Uma kuqhathaniswa nama-ductile iron rolls ane-high-nickel-chromium rolls, ivolumu yokudlula insimbi iphezulu isikhathi ngasinye, okugcina isikhathi sokushintsha umqulu, kuthuthukisa ukusebenza kahle komshini wokugaya futhi kunciphisa izindleko zokukhiqiza.

2. Imiqulu yensimbi enesivinini esikhulu inokuqina okuhle kokushisa. Emazingeni okushisa okugoqa, indawo engaphezulu inokuqina okuphezulu nokumelana nokugqokwa okuhle.
Imiqulu yensimbi enesivinini esikhulu inokuqina okuhle, futhi ubulukhuni obusuka ebusweni bomzimba we-roll ukuya ngaphakathi kwesendlalelo esisebenzayo abuvamile ukuncipha, ngaleyo ndlela kuqinisekiswe ukuthi ama-roll anokumelana okuhle ngokulinganayo ukusuka ngaphandle kuya ngaphakathi.

3. Ngesikhathi sokusebenzisa imiqulu yensimbi enesivinini esikhulu, ngaphansi kwezimo ezinhle zokupholisa, ifilimu ye-oxide encane neminyene yenziwa ebusweni bomzimba we-roll. Le filimu eyiyunifomu, ezacile futhi eminyene ye-oxide ingaba khona isikhathi eside ngaphandle kokuwa, okwenza amaroli ensimbi anesivinini esiphezulu angakwazi ukugqokwa abe ngcono kakhulu.

4. Imiqulu yensimbi enesivinini esikhulu ine-coefficient enkulu yokwandisa impahla kanye ne-conductivity enhle yokushisa. Amaroli e-HSS ayaqhubeka nokuncipha ngenxa yokwandiswa kwezinto zensimbi ezinesivinini esikhulu ngokwazo. Phakathi nenqubo yokugoqa, ukuguqulwa kwe-groove egoqayo kuncane, futhi ukuvumelana kosayizi wembobo kugcinwa isikhathi eside, ikakhulukazi lapho kugoqa ibha noma i-rebar, okulungele kakhulu ukulawula ukubekezelelana okungalungile kwezinto ezigoqayo.
5. Umnyombo we-centrifugally cast high-speed steel roll wenziwe nge-alloy ductile iron, ngakho-ke, amandla entamo ye-roll anamandla.

Isicelo
Isigayo esigaywayo, isigayo esihlukanisayo, isigayo sokuqeda induku enesivinini esikhulu, isigayo sokuqeda imichilo emincane esishisayo, ingxenye kanye nesigayo sensimbi yokugaya.