Txhawm rau kom muaj kev nyab xeeb thiab kev ntseeg siab, nws yog ib qho tseem ceeb heev uas yuav tsum xaiv cov qib zoo thiab kev teeb tsa kom raug kom ntseeg tau tias koj muaj kev nyab xeeb ntawm lub tshuab.
Cov hom tseem ceeb ntawm bolts thiab screws ua los ntawm nti thiab metric steel yog qhia nyob rau hauv rooj 1 (saib hauv qab).
Cov bolts me me (tseem hu ua qib 2 lossis metric 5.8) muaj lub zog tensile txog li 385 MPa. Cov ntaub ntawv pov thawj lub zog yog qhov thauj khoom uas lub fastener tuaj yeem tiv taus yam tsis muaj deformation mus tas li (irreversible puas). Lub zog lav ntawm chav kawm 5 bolts yog 600 MPa, thiab lub zog lav ntawm chav kawm 8 bolts yog 840 MPa. Yog li ntawd, qhov zoo ntawm chav kawm ntawm lub bolt, qhov ntau dua qhov load nws tuaj yeem tiv taus, thaum seem elastic. Thaum lub load raug tshem tawm, zoo bolts rov qab mus rau lawv qhov qub ntev thiab nyob twj ywm elastic, thaum tsis zoo bolts tuaj yeem plasticize thiab mus tas li stretch.
Feem ntau cov engineers siv qhov tseem ceeb ntawm 60% los xam lub zog shear ntawm lub ntsia liaj qhov rooj, yog li qhov no yog txoj cai tseem ceeb ntawm tus ntiv tes xoo rau kev xaiv qhov loj me thiab lub zog shear. Kuv xav tias nws yog qhov ncaj ncees hais tias feem ntau cov tsheb hloov kho tau hloov kho raws li qhov loj me, thiab feem ntau nws tsis muaj kev nyab xeeb, tab sis nws tuaj yeem ua rau cov khoom zoo li lub tsheb thauj khoom hauv qee kis. Cov fasteners me me tuaj yeem ua rau lub tshuab ntse dua, tab sis raws li kuv tus kws qhia ntawv ib zaug tau hais, tsis muaj ib tus neeg ua liaj ua teb yuav yuav lub tsheb laij teb yog tias nws tau tsim rau nws qhov txwv vim nws saib tsis muaj zog los nqa. Txawm li cas los xij, hauv cov tsheb niaj hnub tam sim no peb tab tom pom kev siv me me - yog li nws nyob ntawm koj! Ntau qhov kev hloov kho siv lub qhov (socket head fasteners) uas yog qib 8 zoo.
Thaum xaiv qhov tsim nyog fastener loj, xaiv qib yuav tsum yog raws li qhov sib npaug ntawm tensile lub zog, ductility thiab toughness. Lub zog tensile yog lub zog kawg ntawm cov khoom siv los ntawm cov khoom siv fastener. Ductility yog qib uas lub fastener stretched ua ntej nws ua tsis tau. Lub zog yog hais txog kev qaug zog ua haujlwm thiab muaj peev xwm tiv taus kev sib tw cyclic.
Yog li, paub txog cov lus tseeb ntawm lub cev metallurgy, nws yooj yim dua los xaiv txoj cai bolt qib.
Rau lub rooj zaum ntsia liaj qhov rooj, peb xav tau ib lub pliable buckle uas tuaj yeem ncab ntau ua ntej nws ua tsis tiav, thaum lub sijhawm kev poob siab dhau lawm thiab tus neeg caij tsheb tau txais kev cawmdim. Yog li ntawd, lub rooj zaum anchorages yog nyob rau hauv cov chav kawm mos mos thiab yuav tsum tsis txhob hloov los ntawm high-strength bolts uas ncav cuag lub ncov loads thiab mam li nco dheev poob. Ib yam li ntawd, rau cov fenders, footpegs, firewall mounts, thiab lwm yam tsis tshua muaj kev ntxhov siab tsis tseem ceeb, Class 2 los yog unclassified fasteners yuav siv tau.
Kuv pom cov chav kawm 5 fasteners (8.8 metric) kom haum rau txhua yam ntawm lub tsheb hloov. Lawv muaj chav kawm 8 bolt tensile lub zog tab sis tsis muaj brittleness. Nyob rau hauv kev ncua lawv yuav tiv taus cyclic loads, nyob rau hauv lwm yam kev siv lawv yuav muab shear thiab clamp lub zog tsis muaj zog vim ductility los yog dhau nruj.
Rau kev siv lub cav tseem ceeb xws li lub tog raj kheej taub hau bolts thiab cov khoom siv sib txawv, chav kawm 8 bolts nrog lub zog tsim nyog rau preload clamps nrog tsawg kawg nkaus ntsia liaj qhov rooj yog qhov kev xaiv zoo tshaj.
Cov txiv ntseej feem ntau yog ua los ntawm cov hlau me me lossis me me, zoo ib yam li cov 2 bolts. Txawv txawv raws li nws yuav zoo li, qhov ntev thiab xov tsim ntawm cov txiv ntoo yog txiav txim siab kom lub bolt ua tiav tag nrho lub zog nyob rau hauv load. Qhov no txhais tau hais tias yog tias koj overtighten ib lub fastener, koj yuav feem ntau tshem cov txiv ntoo ua ntej, tawm hauv lub bolt tsis zoo.
Thaum koj nruj lub fastener rau specification, koj siv ib tug preload uas tawm tsam lub load nyob rau hauv opposite kev taw qhia thiab kuj loads lub fastener kom lub load ntxiv tsis stretch lub fastener thiab ua rau nws los xoob.
Kev nruj nruj ntawm tag nrho cov fasteners ntawm lub tsheb yog ib qho tseem ceeb heev, tab sis nyob rau hauv tsawg qhov chaw tseem ceeb, kev paub thiab zoo tib yam wrenches yuav siv tau rau qhov no. Wrenches yog tsim los rau tshwj xeeb fastener qhov ntau thiab tsawg; qhov loj dua lub fastener, ntev lub ciaj ntswj yuav muab qhov tseeb torque los ntawm "tus qauv" tib neeg lub zog. Koj txhua tus nco ntsoov tias tus menyuam kawm ntawv ib txwm tsoo lub quarter-inch screws kom txog thaum nws paub tias cov screws me me yuav tsum tau xoob.
Nylon txiv ntoo muaj ntau heev nyob rau hauv tram designs uas lawv tau loj hloov cov qub-fashioned caij nplooj ntoos hlav washers. Lawv ua haujlwm zoo tshwj xeeb hauv cov ntawv thov qhov kev vibration lossis kev sib hloov yog qhov tseem ceeb thiab tseem yog qhov kev saib xyuas nyuaj. Xyuas kom tseeb tias tsawg kawg ib txoj xov mus los ntawm cov txiv ntoo kom muaj kev sib koom ua ke. Tsis txhob siv cov nylon yas yog tias cov cua sov yuav yaj cov nylon fasteners, thiab tsis txhob siv nws tom qab loosening nws ntau tshaj ob zaug.
Post lub sij hawm: Aug-03-2023