Fretting Wear Mechanism thiab Tiv Thaiv Loose Track Bolts
Q1: Dab tsi yog fretting hnav ntawm cov bolts thiab nws tshwm sim li cas?
A1: Fretting hnav yog hais txog hnav tshwm sim los ntawm kev rov ua dua cov txheeb ze zawv zawg ntawm bolts, txiv ntseej thiab ntxhua khaub ncaws nyob rau hauv me me amplitude. Kev vibration thaum lub tsheb ciav hlau hla dhau ua rau siab - zaus micro- plam ntawm cov xov xov sib cuag, rhuav tshem cov oxide zaj duab xis saum npoo thiab tsim cov khib nyiab hlau. Cov khib nyiab ntxiv ua rau muaj kev sib txhuam thiab hnav, nthuav cov xov tshem tawm thiab txo kev sib txhuam coefficient, nws thiaj li ua rau bolt torque attenuation thiab nws tus kheej - loosening. Fretting hnav feem ntau tshwm sim ntawm bolts nrog ib txwm pom, featuring muaj zog zais thiab kev loj hlob sai.
Q2: Qhov twg bolt fretting hnav hnyav tshaj plaws?
A2: Fretting hnav yog pom tseeb tshaj plaws nyob rau hauv cov pob qij txha, turnouts, curves, crossings thiab lwm yam seem uas muaj zog vibration thiab complex quab yuam. Cov ntu no muaj kev cuam tshuam loj hauv tsheb ciav hlau thiab muaj kev vibration siab, ua rau ntau zaus micro- plam thiab hnav sai dua. Hnyav- cov kab tsheb loj qhia tau ntau dua fretting hnav dua li cov kab zoo tib yam vim yog lub nra loj thiab ntau lub voj voog. Tsis tas li ntawd, ua ke hnav thiab corrosion nyob rau hauv cov ntug hiav txwv dej thiab qhov chaw ntub dej ntxiv ua kom lub bolt tsis ua haujlwm.
Q3: Dab tsi tshwj xeeb cuam tshuam ua rau fretting hnav muaj rau bolt fastening kev ua tau zoo?
A3: Fretting hnav deforms xov profile, tsub kom haum clearance thiab ua rau bolt preload nyuaj rau tswj. Hnav cov khib nyiab hauv nruab nrab ntawm cov xov ua rau qhov tsis tseeb siab torque thiab tsis txaus preload. Ntev - lub sij hawm hnav tsis muaj zog rau cov ntsia liaj qhov rooj zoo, txo lub zog thiab ua kom tawg yooj yim hauv kev thauj khoom. Fretting hnav kuj ua rau kev puas tsuaj los tiv thaiv- cov coatings corrosion, ua kom lub ntsej muag corrosion thiab ua rau ob hom tsis ua haujlwm ntawm "hnav + corrosion".
Q4: Lub tshuab ntxhua khaub ncaws puas tuaj yeem tiv thaiv kev hnav khaub ncaws?
A4: Xauv lub tshuab ntxhua khaub ncaws txhim kho kev sib txhuam thiab txo qis qhov tshwm sim tab sis tsis tuaj yeem tshem tawm tag nrho micro- txav. Raws li kev vibration muaj zog, micro- plam tseem tshwm sim ntawm qhov chaw tiv tauj, thiab fretting hnav tseem nyob. Xauv lub tshuab ntxhua khaub ncaws tsuas yog ncua cov txheej txheem loosening es tsis yog qhov tseem ceeb nres kev txhim kho. Yog li ntawd, ntxiv rau kev tiv thaiv -loosing ntsiab, tsim nyog torque, li niaj zaus retightening thiab kho nto yuav tsum tau ua kom tiav ntev - lub sij hawm fastening.
Q5: Yuav ua li cas kom txo tau cov ntsia hlau fretting hnav thiab loosening ntawm qhov chaw?
A5: Siv cov khoom tsim nyog tiaj tus thiab xauv lub tshuab ntxhua khaub ncaws kom ntseeg tau tias qhov chaw sib cuag tiaj tus thiab kev sib txhuam ruaj khov. nruj me ntsis tswj installation torque kom tsis txhob dhau -loosing los yog dhau -tightening. Siv tshwj xeeb los tiv thaiv-loosing nplaum los yog roj ntawm cov xov kom txo qis micro- plam thiab hnav. Tsis tu ncua ua torque chaw kuaj xyuas ntawm cov bolts tseem ceeb thiab rov kho sai sai. Hloov hnyav hnyav thiab xov- cov bolts puas tau raws sij hawm los tiv thaiv kev nthuav dav.