Kev sib raug zoo ntawm Compression Set Resistance thiab Ntev -Lub Sijhawm Elasticity Retention of Rail Pads
Ntev npaum li cas - lub sij hawm cuam tshuam ntau npaum li cas compression txheej ntawm hauv qab - cov ntaub ntawv tsheb ciav hlau muaj nyob rau ntawm txoj kev nruj?
Cov txheej compression ntau dhau ua rau lub ncoo maj mam poob elasticity thiab ua rau cov yas deformation tsis tuaj yeem nyob rau hauv lub sijhawm ntev - lub caij tsheb ciav hlau caij tsheb kauj vab, nrog kev txo qis tas li. Thickness txo txo qhov pib elastic kev daws teeb meem ntawm txoj kev khiav, maj mam ua kom tag nrho cov kev nruj nruj thiab tsim ib qho "stiffness hardening" tshwm sim. Qhov kev sib tw tsis sib xws no ua rau qhov sib txawv ntawm qhov sib txawv ntawm cov kab khiav, ua rau muaj kev cuam tshuam ib ntus thaum cov tsheb ciav hlau hla, thiab lub log hnyav dua - tsheb ciav hlau hnav thiab tiv thaiv kev qaug zog. Nyob rau tib lub sijhawm, qhov dynamic geometric qhov ntev ntawm txoj kev taug kev nyuaj rau kev tswj hwm, thiab qhov zaus ntawm kev tu thiab kho tau nce ntau dua 40%.
Dab tsi yog qhov txawv ntawm compression teeb tsis kam ntawm cov roj hmab ncoo thiab polyurethane pads, thiab vim li cas lawv cov xwm txheej sib txawv?
Rubber pads muaj qhov tsis muaj zog compression teeb tsis kam, nrog rau qhov deformation mus tas li feem ntau ntawm 20%-25%, tab sis lawv muab cov elasticity zoo thiab tus nqi qis, ua rau lawv haum rau cov kab zoo tib yam - ceev -load kab. Polyurethane pads muaj ib tug ruaj khov molecular qauv, nrog ib tug compression teem tus nqi Tsawg dua los yog sib npaug rau 10%-ib nrab ntawm cov roj hmab ncoo-thiab zoo dua kev laus thiab hnav tsis kam, haum rau siab -ceev thiab hnyav- cab kab. Siab- cov kab nrawm muaj qhov yuav tsum tau ua kom muaj kev ruaj ntseg ruaj khov, thiab hnyav- cov kab tsheb thauj khoom muaj cov khoom loj nrog cov yas deformation siab rau cov ntaub qhwv; Yog li ntawd, polyurethane pads yuav tsum tau siv. Ordinary-ceev kab muaj cov khoom me me thiab qis dua qhov yuav tsum tau ua kom ruaj khov, yog li cov ntaub qhwv roj hmab tuaj yeem ua tau raws li qhov xav tau.
Vim li cas lub compression teem tus nqi qis dua -rail pads nce sharply nyob rau hauv siab -kub ib puag ncig?
Cov kub kub ua kom lub thermal txav ntawm cov khoom siv hauv ncoo cov saw hlau molecular, ua rau kev so ntawm tus ntoo khaub lig- txuas cov qauv ntawm cov roj hmab lossis polyurethane thiab txo qis hauv cov khoom siv elastic modulus. Nyob rau hauv siab - ib puag ncig kub siab tshaj 70 degree, cov saw hlau molecular ntawm cov roj hmab pads yog qhov ua rau tawg lossis rov kho dua tshiab, ua rau txo qis hauv lawv lub peev xwm los tiv thaiv cov yas deformation, thiab cov txheej txheem compression tuaj yeem nce mus rau ntau dua 35%. Tsis tas li ntawd, qhov kub thiab txias txo qhov kev sib txuas ntawm lub ncoo thiab cov pw tsaug zog / tsheb ciav hlau, ua rau lub ncoo plam hauv qab load thiab exacerbating yas deformation, ua rau lub voj voog vicious ntawm "high temperature-deformation-stiffness change".
Dab tsi yog qhov kev sib raug zoo ntawm compression teeb kev ua tau zoo ntawm hauv qab -rail pads thiab installation preload?
Kev teeb tsa siab dhau los ua rau lub ncoo thawj zaug compression tus nqi siab tshaj tus nqi tsim (piv txwv li, tshaj 25%), tso cov ntaub qhwv rau hauv siab - lub xeev kev ntxhov siab rau lub sijhawm ntev, ua kom qaug zog rau cov saw hlau molecular, thiab ua kom cov txheej txheem compression nce. Tsis txaus preload tso cai rau ntau dhau reciprocating compression deformation ntawm lub ncoo nyob rau hauv lub tsheb ciav hlau loads, nrog nce deformation ib compression voj voog, kuj accelerating lub tsub zuj zuj ntawm mus tas li deformation. Tsuas yog nyob rau hauv qhov tsim preload ntau, nrog lub ncoo lub compression tus nqi khaws cia ntawm 15% -20%, tuaj yeem ua rau cov saw molecular kev nyuaj siab nyob rau hauv ib qho kev pom zoo, ua rau qhov kev ncua ntev ntawm kev deformation mus tas li.
Yuav soj ntsuam sai npaum li cas seb cov txheej txheem compression ntawm hauv qab -rail pads tshaj qhov txwv ntawm qhov chaw?
Cov "thickness measurement method" tuaj yeem siv tau: xaiv cov ntaub qhwv tshiab ntawm tib batch raws li cov qauv ntsuas, ntsuas qhov tseeb thickness ntawm - cov ntaub qhwv rau ntawm qhov chaw, thiab xam cov thickness txo tus nqi. Yog hais tias lub thickness txo tus nqi ntawm cov roj hmab ncoo tshaj 25% thiab cov polyurethane pads tshaj 10%, nws qhia tau hais tias ntau compression txheej. Nyob rau tib lub sijhawm, saib lub ncoo lub ntsej muag: yog tias lub ncoo pom pom kev nyuaj siab, flattening, poob ntawm nws qhov qub elastic contour, lossis tsis tuaj yeem rov qab sai sai tom qab kev tsheb ciav hlau, nws qhov deformation mus tas li yog qhov hnyav. Tsis tas li ntawd, ua ke nrog cov ntaub ntawv ntsuas kev sib tw, yog tias txoj kev tsheb ciav hlau qhov ntev ntawm qhov sib txawv ntawm ib ntu feem ntau dhau qhov kev txwv, nws yog qhov muaj feem ntau tias cov txheej txheem compression ntawm cov ntaub qhwv hauv ntu ntawd yog ntau dhau.