Txawm hais tias zoo li tsis muaj qhov pom tseeb txheeb ze ntawm ob qhov chaw, qhov chaw sib cuag tau hnav. Piv txwv li, qhov hnav ntawm lub nplhaib sab nraud ntawm cov kabmob thiab cov kabmob lub rooj zaum hauv qab.
Ob qhov chaw yog lubricated kom meej meej thiab tsis muaj qhov txheeb ze, tab sis tsis ntev muaj cov cim qhia ntawm xeb, xws li "liab xeb" ntawm spline haum rau hauv daim duab hauv qab no.
Dab tsi tshwm sim? Nov yog qhov peb yuav kawm txog niaj hnub no: Fretting Corrosion.
Fretting corrosion yog hais txog kev puas tsuaj saum npoo av uas tshwm sim hauv qhov chaw sib cuag ntawm ob lub hlau. Nws yog tshwm sim los ntawm kev sib tw me ntsis, kev vibrations lossis zawv zawg ntawm cov hlau nto (txawm tias qis li qib nanometer) ntxiv rau corrosive erosion ntawm ib puag ncig.
Qhov feem ntau cuam tshuam ntawm ib puag ncig sab nraud yog oxidation. Thaum muaj micromotion ntawm ob qhov chaw, cov hlau ntawm qhov chaw siab ntawm kev sib cuag yog deformed thiab tev tawm ntawm qhov chaw mus rau hauv cov khoom zoo los ntawm kev siv tshuab cyclic. Tom qab ntawd lawv tau oxidized thiab dai ntawm qhov chaw micromotion. Qee qhov poob rau hauv qhov qis -dej thaj chaw ntawm qhov chaw micromotion, thiab qee qhov oxides txuas ntxiv ua cov abrasives ntawm qhov chaw sib cuag, ua rau cov khoom tshem tawm ntau dua. Tom qab hnav cov hlau, yog tias cov yeeb yaj kiab tshiab tsis tuaj yeem tsim nyob rau lub sijhawm, qhov hnav yuav ua rau hnyav dua.
Cov saum toj no yog lub hauv paus ntsiab lus ntawm fretting corrosion. Yog li cas peb yuav tsum zam nws?
1. Txhawm rau tiv thaiv fretting corrosion, thawj qhov yog los tiv thaiv "fretting". Qhov no tuaj yeem suav nrog kev hloov pauv, xaiv qhov tsim nyog kam rau ua, txhim kho qhov tseeb, tshem tawm txhua qhov kev vibration, kom ntseeg tau tias tag nrho cov pob qij txha raug nruj, thiab lwm yam.
2. Kev txhaj tshuaj peening yog ua rau ntawm qhov chaw sib chwv los tsim cov yas tawm los thiab cov seem compressive kev ntxhov siab rau ntawm qhov chaw los txhim kho kev tiv thaiv kev qaug zog.
3. Siv cov tshuaj tiv thaiv -fretting agent txheej
4. Siv cov roj nplua nyeem zoo dua thiab ua kom cov roj nplua nyeem ntau zaus.(Tau qhov twg los: iMechanics 机械)
