Ƙananan ilimi

Nadi shine muhimmin sashi na birgima a cikinmirgina niƙa.Ana amfani da matsi da aka samar da nau'i-nau'i ko rukuni na rolls don mirgina karfe.Yana ɗaukar tasirin tasiri mai ƙarfi da tsayin daka, lalacewa da canje-canjen zafin jiki yayin mirgina.
Rolls iri biyu ne: nadi mai zafi da nadi mai sanyi.
Kayan aiki na rolls a cikin naɗaɗɗen sanyi na gama gari sun haɗa da 9Cr, 9cr2,9crv, 8crmov, da dai sauransu. Rolls na sanyi suna buƙatar quenching surface, kuma taurin shine hs45 ~ 105.
Abubuwan da aka saba amfani da su don rollers masu zafi sune 55mn2,55cr, 60CrMnMo, 60simnmo, da sauransu. , kuma mirgine mai zafi yana aiki a babban zafin jiki, kuma yana ba da damar diamita lalacewa a cikin aikin naúrar, don haka baya buƙatar taurin ƙasa, amma kawai ƙarfin ƙarfi, ƙarfi da juriya mai zafi.Nadi mai zafi mai zafi ana daidaita shi ne kawai ko kuma an kashe shi gaba ɗaya, kuma ana buƙatar taurin saman ya zama hb190 ~ 270.Taurin rolling taurin kimar jiki ce kaikaice, kuma matakin nata yana shafar yanayin tsarin tsarin nadi da kansa, kamar taurin matrix na kayan nadi, nau'in da adadin carbides a cikin kayan nadi, ragowar damuwa na nadi, da sauransu;A lokaci guda, saboda gwaje-gwajen taurin bakin da aka saba amfani da su da gwajin tauri na Leeb don gwajin hardness na birgima shine sake dawo da gwaje-gwajen taurin, yanayin kayan gwaji, abubuwan tunani na masu aiki da sauran abubuwan sun shafe su sosai.Sabili da haka, duka masana'anta da yin amfani da sassan rolls suna buƙatar sanya ma'aikata na musamman don ɗaukar nauyin gwajin ƙarfi, kula da zaɓin ma'aunin taurin, kuma alaƙar kwatanta da sauran taurin yakamata ta kasance karko.A lokaci guda, kula da ƙaddamarwa akai-akai da daidaita kayan gwajin tauri da daidaitattun tubalan gwaji.Ƙwararrun masana'antu za su iya haɓaka amfani da mizanin nadi don ƙwaƙƙwaran gwajin gwaji.