Juyin Halitta na Kayayyakin Hatimi
Juyin halittar kayan hatimi ya samo asali yayin da hatimin ke fuskantar ƙarin buƙatu masu kauri.Ana iya biyan buƙatun farko ta amfani da cushe hemp ko fata, amma yayin da buƙatun suka ƙara ƙaruwa ana neman sabbin kayayyaki.Wannan ya haifar da ƙaddamar da hatimin roba na halitta, wanda ya samo asali zuwa elastomer na roba, kuma a ƙarshe na injiniyan injiniya kamar PTFE (Polytetrafluoroethylene).
Hudu daga cikin zaɓuɓɓukan kayan yau da kullun na yau da kullun don leɓuna shaft hatimi sune nitrile roba, polyacrylate, FKM, da PTFE.Daga cikin waɗannan kayan, uku sune elastomers - nitrile rubber, polyacrylate rubber da FKM - kuma ɗaya kawai shine polymer - PTFE.Bari mu ga yadda waɗannan kayan suka taru.
Material 1: Nitrile Rubber
Nitrile rubber yana da sunaye kaɗan, gami da acrylonitrile butadiene roba, Buna-N, da NBR.Ainihin shi na'urar roba ce ta roba wacce ke da matukar juriya ga wasu sinadarai masu mahimmanci kamar mai, mai, da mai.Idan aka kwatanta da sauran elastomers, yana yin kyakkyawan aiki na ƙin lalacewa da fallasa ga rana da yanayi.Yana da iyaka, ko da yake.
Material 2: Polyacrylate Rubber
Polyacrylate yana nufin roba polyacrylate kuma wani lokacin ana kiransa ACM.Yana ba da mafi kyawun juriya na zafi kuma yana dacewa da mafi girman magudanar ruwa fiye da robar nitrile.Hakanan yana da kyau a wasu aikace-aikace na musamman kamar kayan shafawa waɗanda suka haɗa da sulfur.Iyakantaccen ƙarfinsa da juriya na ruwa sune manyan halayen iyakancewarsa.
Abu na 3: FKM (Fluoroelastomers)
Ga gaskiya mai ban sha'awa: sau da yawa mutane suna ruɗe game da bambanci tsakanin FKM, FPM, da Viton.Dukkansu suna magana ne akan kayan tushe iri ɗaya.Sunan FKM ya samo tushen sa a cikin nau'ikan ASTM na flouroelastomers, yayin da FPM shine taƙaitaccen DIN/ISO.Viton shine sunan kasuwancin sa, mallakar DuPont.Abubuwan da ke cikin FKM sun fi na ko dai na nitrile robar ko polyacrylate rubber, duka dangane da yanayin zafi da sauri, amma kuma juriya na sinadarai.Har ila yau, shi ne mafi tsada daga cikin elastomer guda uku da aka tattauna ya zuwa yanzu.
Material 4: PTFE (Polytetrafluoroethylene)
PTFE an fi saninta da sunan kasuwanci, polymer (kuma mallakar DuPont).PTFE nisa ya zarce aikin roba na nitrile, rubber polyacrylate, da FKM dangane da saurin shaft, zafin jiki, da juriya na sinadarai.A zahiri, yana da mafi kyawun juriya na sinadarai na kowane polymer ko elastomer haka kuma mafi ƙarancin ƙima na gogayya.
Kammalawa
Jadawalin da ke ƙasa yana nuna yadda waɗannan kayan hatimi guda huɗu na gama-gari suka taru ga juna dangane da iyakan saurin gudu.PTFE ya fi sauran, har ma da saurin gudu fiye da 30,000 rpm.Lokacin da kake zaɓar hatimin da ke buƙatar tsira daga yanayi mai lalacewa da ƙalubale a maɗaukakin gudu, kada ka kalli PTFE.
Lokacin aikawa: Mayu-08-2018