Fatigue Life Enhancement Technology rau Elastic Clips thiab Load Adaptability Design hla txhua txoj kab tsheb ciav hlau
Yuav ua li cas yog lub tiam mechanism ntawm elastic strip qaug zog kab nrib pleb thiab lawv txaus ntshai rau lub fastening system?
Cov txheej txheem tsim ntawm elastic strip qaug zog tawg yog qhov pib thiab nthuav tawm ntawm micro- tawg nyob rau hauv qhov kev txiav txim ntawm alternating stress cycles. Txoj hlua elastic rov ua dua qhov hloov pauv ntawm "compression-rebound" thaum lub tsheb ciav hlau khiav. Thaum tus naj npawb ntawm cov voj voog thauj khoom ntau dua 100,000 zaug, micro- tawg yuav tsim nyob rau hauv qhov kev ntxhov siab ntawm cov hlua elastic. Cov micro- cov kab nrib pleb no yuav maj mam nthuav tawm nrog qhov nce ntawm cov voj voog thauj khoom, thiab thaum lub sijhawm tawg mus txog qhov tseem ceeb, cov hlua elastic yuav raug tawg tawg. Qhov kev ntxhov siab ntawm cov hlua elastic feem ntau tshwm sim nyob rau hauv qhov chaw hloov pauv thiab qhov kawg khoov ib feem ntawm cov hlua elastic, thiab qhov kev ntxhov siab ntawm cov khoom no tuaj yeem ncav cuag ntau dua 2.5, uas yog siab dua qhov kev ntxhov siab ntawm elastic strip lub cev. Cov kab nrib pleb ntawm lub elastic strips tsis tshua muaj teeb meem rau lub fastening system. Qhov tawg propagation yuav ua rau lub attenuation ntawm lub zog buckling ntawm elastic strip. Thaum lub buckling quab yuam poob los ntawm ntau tshaj 20%, txoj kev tsheb ciav hlau yuav muaj kev hloov mus rau sab nraud, cuam tshuam rau kev ua haujlwm ntawm lub tsheb ciav hlau. Yog hais tias lub elastic strips tawg, nws yuav ncaj qha ua rau txoj kev tsheb ciav hlau tsis muaj kev txwv, ua rau muaj kev nyab xeeb loj ntawm lub tsheb ciav hlau derailment. Yog li ntawd, kev txhim kho qhov qaug zog tsis kam ntawm elastic strip yog qhov tseem ceeb tshaj plaws ntawm kev tsim cov txheej txheem fastening.
Dab tsi yog cov khoom siv mis optimization ntsuas rau elastic strip qaug zog tiv thaiv?
Cov khoom siv mis optimization ntsuas rau elastic strip qaug zog tiv thaiv feem ntau tsom rau peb yam: matrix cov ntaub ntawv kho dua tshiab, cov ntsiab lus alloy ntxiv thiab tswj cov ntsiab lus impurity. Cov khoom siv matrix txais 60Si2CrVA caij nplooj ntoos hlav steel es tsis txhob siv 60Si2Mn cov hlau. Lub zog tensile ntawm 60Si2CrVA steel tuaj yeem ncav cuag ntau dua 1800MPa, lub zog tawm los yog ntau dua lossis sib npaug ntawm 1600MPa, thiab kev qaug zog tsis kam yog ntau dua 30% siab dua li cov khoom siv ib txwm muaj. Nyob rau hauv cov nqe lus ntawm alloy ntsiab ntxiv, cov ntsiab lus ntawm chromium thiab vanadium ntsiab yog precisely tswj. Cov nyiaj chromium ntxiv yog tswj ntawm 0.9%-1.2%, uas tuaj yeem txhim kho cov tawv tawv thiab corrosion tsis kam ntawm cov khoom; cov ntsiab lus ntawm vanadium ntxiv yog tswj ntawm 0.15% -0.25%, uas tuaj yeem kho cov nplej thiab txhim kho lub zog thiab qaug zog ntawm cov khoom. Kev tswj cov ntsiab lus impurity yog tus yuam sij rau kev ua kom zoo dua qub. Cov ntsiab lus ntawm leej faj thiab phosphorus ntsiab lus yuav tsum tau tswj hauv qab 0.02% kom tsis txhob tsim cov nkig inclusions los ntawm impurity cov ntsiab lus, uas ua rau cov ntsiab lus pib ntawm qaug zog tawg. Tom qab kev ua kom zoo dua qub, cov khoom siv elastic yuav tsum tau ua raws li cov txheej txheem kev kho cua sov, siv cov txheej txheem ua ke ntawm "quenching + medium-temperature tempering". Lub quenching kub yog tswj ntawm 850-870 degree, thiab tempering kub yog tswj ntawm 420-440 degree, thiaj li hais tias cov elastic strip tau zoo heev zoo txhua yam khoom kom tau raws li qhov qaug zog tsis kam tsim cov cai.
Dab tsi yog qhov optimized tsim qauv rau cov qauv kev ntxhov siab dispersion ntawm elastic strips?
Lub tswv yim tsim kho kom zoo rau cov txheej txheem kev ntxhov siab cuam tshuam ntawm elastic strips siv peb lub tswv yim: arc hloov pauv, hloov pauv hloov pauv -section tsim thiab qhov kawg txhawb nqa. Tag nrho cov kev hloov ntawm lub kaum ntse ntse ntawm cov hlua elastic yog hloov mus rau qhov kev hloov pauv ntawm R5-R8mm, txo qhov kev ntxhov siab ntawm 2.5 mus rau qis dua 1.2 thiab tshem tawm qhov kev ntxhov siab. Tus ntoo khaub lig sib txawv -section tsim kho tus ntoo khaub lig- ntu loj raws li qhov kev ntxhov siab ntawm cov hlua elastic, ua rau tus ntoo khaub lig- ntu tuab hauv qhov siab- qhov kev ntxhov siab arc cheeb tsam los ntawm thawj 8mm mus rau 10mm; txo tus ntoo khaub lig-section thickness nyob rau hauv qhov qis-stress ncaj cheeb tsam los ntawm thawj 8mm mus rau 6mm kom ua tau raws li cov kev ntxhov siab faib. Qhov kawg qhov kev tsim kho tau txais kev kho mob hauv zos peening los tsim cov txheej txheem kev ntxhov siab seem nrog lub thickness ntawm 0.1-0.2mm ntawm qhov kawg khoov ib feem ntawm elastic strip. Tus nqi seem compressive kev ntxhov siab tuaj yeem ncav cuag -200MPa rau -300MPa, uas tuaj yeem cuam tshuam cov txiaj ntsig ntawm kev hloov tensile kev ntxhov siab thiab ncua kev pib qaug zog tawg. Tom qab kev txhim kho cov txheej txheem ua tiav, finite element simulation tsom xam yuav tsum tau txheeb xyuas qhov kev ntxhov siab, simulate lub xeev kev ntxhov siab ntawm elastic strips nyob rau hauv qhov tseeb loads, thiab xyuas kom meej tias qhov kev ntxhov siab ntawm txhua feem yog qis dua qhov qaug zog ntawm cov khoom. Tsis tas li ntawd, kev sim qaug zog yuav tsum tau ua kom paub tseeb tias cov hlua elastic tsis muaj cov kab nrib pleb hauv qab 10 lab alternating loads, ua tau raws li cov kev pabcuam ntawm txhua kab.
Dab tsi yog qhov sib txawv tsim cov ntsiab lus ntawm elastic strips nyob rau hauv cov kab sib txawv?
Qhov sib txawv tsim cov ntsiab lus ntawm elastic strips nyob rau hauv cov kab sib txawv loads yog feem ntau xav nyob rau hauv peb yam: buckling quab yuam theem, txhav txuam thiab qaug zog kuj. Elastic strips rau siab - txoj kab tsheb ciav hlau ceev tau txais kev tsim qauv ntawm lub zog buckling siab thiab tsis tshua muaj zog, nrog lub zog buckling tswj ntawm 12-15kN thiab qhov nruj tswj ntawm 50-60kN / mm, uas tuaj yeem cuam tshuam qhov siab - zaus ntawm txoj hlua khi ntawm nws tus kheej. Cov hlua elastic rau hnyav- cov kab nqa tau txais kev tsim qauv ntawm ultra- siab buckling quab yuam thiab siab nruj, nrog lub zog buckling tau nce mus rau 18-20kN thiab qhov tawv tawv tau nce mus rau 80-90kN / mm, uas tuaj yeem tiv taus qhov hnyav axle load} qhov hnyav ntawm qhov hnyav thiab qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm qhov hnyav ntawm 18 kN / mm. tsheb ciav hlau. Cov strips elastic rau cov kab nrawm nrawm tau txais kev tsim kev lag luam, nrog lub zog buckling tswj ntawm 8-10kN thiab nruj tswj ntawm 70-80kN / hli, txo cov nqi tsim khoom thaum ua tau raws li qhov yuav tsum tau ceev ceev. Qhov sib txawv tsim kuj yuav tsum tau xav txog qhov corrosive ib puag ncig ntawm txoj kab. Lub elastic strips rau cov ntug hiav txwv kab yuav tsum tau nruab nrog anti-corrosion coatings, thiab cov elastic strips rau alpine kab yuav tsum optimize lub low-temperature toughness ntawm cov khoom kom ntseeg tau tias tsis muaj nkig tawg nyob rau hauv lub qis-kub ib puag ncig ntawm -40 degree. Lub elastic strips ntawm cov kab sib txawv yuav tsum dhau qhov kev ntsuam xyuas kev ua tau zoo txhawm rau txheeb xyuas lawv cov kev pabcuam kev ua haujlwm raws li cov khoom sib thooj thiab xyuas kom meej qhov tsim nyog ntawm cov qauv tsim.
Dab tsi yog cov txheej txheem tseem ceeb thiab kev lees paub rau elastic strip qaug zog nrhiav pom lub neej?
Cov txheej txheem tseem ceeb rau kev tshawb nrhiav qhov elastic strip fatigue lub neej muaj xws li ob pawg: lub rooj ntev zaum kev qaug zog thiab kev sim ua haujlwm. Lub rooj ntev zaum kev qaug zog siv lub siab - zaus kev qaug zog kuaj tshuab los siv cov khoom sib hloov raws li cov kab tiag tiag, thiab cov zaus thauj khoom raug tswj ntawm 50-100Hz los simulate lub xeev kev ntxhov siab ntawm cov hlua elastic. Cov hlua elastic rau siab - cov kab tsheb ciav hlau ceev yuav tsum dhau 10 lab lub voj voog tsis muaj kab nrib pleb, cov kab hnyav - cov kab yuav tsum dhau 8 lab lub voj voog tsis muaj kab nrib pleb, thiab cov kab zoo tib yam - cov kab nrawm yuav tsum dhau 5 lab lub voj voog tsis muaj kab nrib pleb. Kev kuaj kev pabcuam teb xaiv cov kab ke ib txwm los nruab rau qhov ntsuas elastic strips, saib xyuas cov buckling quab yuam attenuation tus nqi thiab tawg pib ntawm elastic strips. Lub buckling quab yuam attenuation tus nqi siab ntawm siab - txoj kev tsheb ciav hlau ceev yog tsawg dua los yog sib npaug li 5% / xyoo, qhov hnyav ntawm - cov kab tsheb ciav hlau tsawg dua lossis sib npaug li 8% / xyoo, thiab cov kab khiav ceev yog tsawg dua lossis sib npaug li 10% / xyoo. Cov qauv kev lees paub yog tias ob qho tib si lub rooj ntev zaum qaug zog thiab kev sim ua haujlwm ua tau raws li cov qauv, lub neej qaug zog ntawm elastic strips ua tau raws li cov qauv tsim, thiab qhov tsim nyog tus nqi ntawm tib batch ntawm elastic strips yog ntau dua los yog sib npaug rau 99%. Tsis tas li ntawd, nws tseem yuav tsum tau kuaj xyuas cov ntsuas xws li qhov tseeb qhov tseeb thiab qhov zoo ntawm cov hlua elastic los xyuas kom meej tias cov khoom zoo raws li cov qauv. Tsis tsim nyog elastic strips yuav tsum tau muab pov tseg kiag li thiab yog nruj me ntsis txwv tsis pub muab tso rau hauv engineering siv.