Bimetallicheskiye podshipniki — odno iz samykh trebovaltelnykh primeneniy dlya predvaritelno legirovannykh bronzovykh poroshkov. Tonkiy sloy bronzy tolshchinoy 0,3–1,5 mm spekayet sya neposredstvenno na stalnuyu lentu v protyazhnoy pechi, sozdavaya kompozit, ob yedinyayushchiy prochnost stali s tribologicheskimi svoystvami bronzy. CuSn10Pb10 desyatiletiyami byl standartnym splavom, no direktivy YES i globalnyye ekologicheskiye initsiativy stimuliruyut perekhod na bessvintsovistyye alternativy.
Rol svintsa v traditsionnykh bronzovykh splavakh dlya podshipnikov
V sisteme CuSn10Pb10 svinets vypolnyayet tri tribologicheskiye funktsii: prisposablivayemost k nesoosnoti vala, sposobnost vkrapleniya zagryaznyayushchikh chastits i avariynoye smazyvanie v usloviyakh granichnogo treniya. 10% svintsa — eto balans mezhdu tribologiyey i nesushchey sposobnostyu matritsy med-olovo.
CuSn10Pb10: kharakteristiki poroshka i povedeniye pri spekanii
Poroshok dlya bimetallicheskikh lent dolzhen sootvetstvovat strrogim spetsifikatsiyam. Granulometriya kontroliruyetsya v diapazone -150 +45 mkm. Nasypnaya plotnost po ISO 3923 dolzhna sostavlyat 2,8-3,4 g/sm3. Pri spekanii v vosstanovitelnoy atmosphere pri 780-850 gradusakh olovo formiruyet tranziyentnuyu zhidkuyu fazu. Svinets zhidkiy v techeniye vsego tsikla i dolzhen uderzhivatsya v matritse.
Protsess proizvodstva bimetallicheskoy lenty
Protsess nepreryvnogo spekaniya vklyuchayet: obezzzhirivaniye stalnoy lenty, nasyp poroshka, prokhozhdenie cherez lentochnuyu pech s zonami predrvaritelnogo nagreva, spekaniya pri 780-850 gradusakh i okhlazhdeniya, prokatku i vtoroye spekaniye. Skorost linii 0,3-2,0 m/min.
Bessvintsovistyye bronzovyye alternativy: sistemy splavov i kompromissy
Udaleniye svintsa sozdayet vyzov, tak kak ni odin element ne vosproizvodit vse tri funktsii. CuSn10Bi3 ispolzuyet vismut — pokhozh, no bole khrupkiy. CuSn8Ni1 ukreplyayet matritsu nikelem, no snizhayet prisposablivayemost. CuSn10 bez myagkoy fazy trebuyet bolee zhostkikh dopuskov.
Iznosostoykost i vybor klassa podshipnika
Vybor klassa zavisit ot splava, tolshchiny sloya, pokrytiya i usloviy ekspluatatsii. Dlya podshipnikov avtomobilnykh dvigateley CuSn10Pb10 ostayet sya standartom. Standardizirovannyye ispytaniya na iznos izmeryayut skorost iznosa, nagruzku zayedaniya, ustalostnyyu prochnost i korrozionnuyu stoykost. MEPOSO optimiziruyet spetsifikatsii dlya kazhdogo primeneniya.
Prisposablivayemost, vkrapleniye i ustalostnoye soprotivleniye
Prisposablivayemost, vkrapleniye i ustalostnoye soprotivleniye obrazuyut vzaimosvyazannyy treugolnik. Svinets obespechivayet prisposablivayemost i vkrapleniye; bez svintsa eti funktsii berut na sebya pokrytiya ili kontroliruyemaya poristost. Poroshkovaya metallurgiya pozvolyayet tonkuyu nastroyku.
Regulyatornyye ramki i perekhod k bessvintsovistyim
Direktiva ELV YES, REACH (spisok SVHC) i RoHS stimuliruyut eliminatsiyu svintsa. Isklyucheniya dlya podshipnikov periodicheski peresmtatrivayutsya. MEPOSO postavlyayet oba varianta iz Milano, Italiya.
Kontrol kachestva poroshka dlya podshipnikovykh primeneniy
Kontrol kachestva MEPOSO vklyuchayet: khimicheskiy analiz ICP-OES, lazernuyu granulometriyu D10/D50/D90, sitovoiy analiz, nasypnuyu plotnost po Khollu, raskhod i morfologicheskoye issledovaniye. Kazhdaya partiya soprovozhday etsya sertifikatom analiza.
Bronzovyye poroshki MEPOSO dlya proizvodstva podshipnikovykh lent
MEPOSO proizvodit predvaritelno legirovannyye bronzovyye poroshki v Milano, Italiya: CuSn10Pb10, CuSn10Bi3, CuSn8Ni1 i CuSn10. Tekhnicheskaya podderzhka vklyuchayet optimizatsiyu spekaniya, metallurgicheskiy analiz i razrabotku individualnykh splavov.
Svyazhites s MEPOSO dlya polucheniya predvaritelno legirovannykh bronzovykh poroshkov dlya bimetallicheskikh lent, vklyuchaya CuSn10Pb10 i bessvintsovistyye alternativy.
