Babban Ingancin Diesel Fuel Injector Nozzle DN4PD57 don Abubuwan Injin Toyota na Denso

Binciken dalilin da yasa bututun mai ya makale a cikin alluran (Kashi na 2)

2.2 Sakamakon ma'aunin zafi da taurin saman ƙasa ana auna bawul ɗin allura kuma abin da ake buƙata na buƙatun buƙatun allura shine 61HRC～65HRC don buƙatun taurin saman. Rashin ƙarancin bawul ɗin allura tare da lambar hatimin karfe HHM shine Ra0.03 Rt0.34, kuma taurin saman shine 60.4HRC～60.7HRC; Bawul ɗin allura tare da lambar hatimin karfe HD shine Ra0.02, Rt0.37, kuma taurin saman shine 62.3HRC. Rashin ƙarfi da taurin bawul ɗin allura biyu da aka ƙaddamar don dubawa duk sun cika ka'idodin ƙira. Bayan an rarraba bututun ƙarfe, an auna ƙarancin rami na ciki. Bukatar ƙarancin ramin ciki na bututun ƙarfe shine 0.05Rt0.8. Valve Ra0.07 ~ 1.16, Rt0.82 ~ 1.79. Ramin rami na ciki na nozzles biyu da aka ƙaddamar don dubawa bai cika buƙatun ƙira ba.

2.3 Ma'aunin taurin saman saman da sakamakon bincike na metallographic Ana buƙatar taurin saman bawul ɗin allura ya zama 61HRC-65HRC, ba'a ba da izinin bainite kyauta kuma ragowar austenite baya wuce 5%. Taurin bawul ɗin allura tare da lambar hatimi na farko HHM shine 62.9HRC～63.6HRC, girman hatsi shine 10, kuma matakin superheat shine 2; Taurin bawul ɗin allura tare da lambar hatimin ƙarfe na farko HD shine 62.4HRC～63.4HRC, girman hatsi shine 9 kuma matakin superheat shine 2. Taurin bawul ɗin allura guda biyu duk sun cika buƙatun ƙira.