Friction Material Structure, Material classification and Application
1) Cov khoom sib txhuamyog ib qho khoom siv uas siv rau lub tshuab fais fab thiab tso siab rau kev sib txhuam los ua haujlwm braking thiab kis tau tus mob. Nws feem ntau muaj lub hauv paus nres (brake pad) thiab lub ntsej muag clutch (clutch phaj). Nres pads yog siv rau braking thiab clutch daim hlau yog siv rau kev sib kis.
Kev sib txhuam cov khoom siv yog cov khoom siv ua haujlwm siv hauv ntau lub tshuab ua kis las thiab cov khoom siv rau kev sib kis, braking, deceleration, steering, chaw nres tsheb, thiab lwm yam. Cov ntaub ntawv sib txhuam yog qhov tseem ceeb ntawm kev nyab xeeb hauv kev lag luam tsheb. Qhov pib, nres thiab nres tsheb ntawm lub tsheb yog sib cais los ntawm cov khoom sib txhuam. Qhov zoo thiab qhov zoo ntawm cov ntaub ntawv sib txhuam yog ncaj qha ntsig txog kev nyab xeeb ntawm tib neeg lub neej thiab khoom.
2) Kev faib khoom siv
Cov ntaub ntawv sib txhuam asbestos tau muab faib ua pawg hauv qab no:
Asbestos fiber ntau sib txhuam cov khoom, tseem hu ua asbestos velvet kev sib txhuam khoom. Ntau lawm: ntau yam nres nres, clutch daim hlau, tsheb ciav hlau hluavtaws nres khau, asbestos velvet roj hmab siv, thiab lwm yam.
b Asbestos linear kev sib txhuam cov khoom. Ntau lawm: winding clutch daim hlau, tws asbestos hlau ntu kev sib txhuam cov ntaub ntawv.
c Asbestos ntaub txhuam cov khoom siv. Kev tsim khoom: siv lub tshuab nres, nres siv, clutch npog, thiab lwm yam.
d Asbestos weave cov khoom sib txhuam. Kev tsim khoom: Kev tsim cov roj immersion lossis resin dipped brake siv. Roj rig brakes thiab lwm yam.
B Cov ntaub ntawv tsis-asbestos kev sib txhuam yog muab faib ua pawg hauv qab no:
Semi-metallic txhuam cov khoom siv rau cov disc nres rau cov neeg caij tsheb thiab cov tsheb hnyav. Cov khoom muaj pes tsawg leeg feem ntau muaj li ntawm 30 feem pua rau 50 feem pua ntawm cov ntaub ntawv hlau ferrous (xws li steel fiber, txo cov hmoov hlau, thiab hmoov hlau foamed). Yog li ntawd, semi-metallic sib txhuam cov ntaub ntawv muaj npe.
b NAO cov khoom sib txhuam. Hauv kev txiav txim siab dav, nws hais txog cov khoom siv tsis-asbestos-tsis-steel fiber ntau sib txhuam, tab sis cov discs kuj muaj me me ntawm cov hlau fibers. Cov khoom siv hauv paus hauv NAO cov khoom sib txhuam yog feem ntau sib xyaw ntawm ob lossis ntau dua fibers (inorganic fibers nrog me me ntawm cov organic fibers).
c hmoov metallurgy kev sib txhuam cov khoom. Kuj tseem hu ua sintered kev sib txhuam cov khoom, cov hlau-raws li thiab tooj liab-raws li cov khoom siv hmoov sib tov, nias, thiab sintered ntawm qhov kub thiab txias. Haum rau kev sib tsoo thiab kev sib kis ntawm qhov kub thiab txias. Xws li: aircraft, tsheb thauj khoom, nres thiab kis tau tus mob hnyav siv tshuab.
Qhov zoo:lub neej ua haujlwm ntev; qhov tsis zoo: cov khoom lag luam siab, lub suab nrov nres loj, hnyav thiab nkig, thiab loj hnav thiab tsim kua muag.
d Cov khoom siv carbon fiber ntau sib txhuam.
3) Kev thov
Cov ntaub ntawv asbestos tau dav siv los ua kev sib txhuam brakes rau tsheb nres tsheb. Txawm hais tias nws lub peev xwm nqa tau tsis zoo li cov khoom siv hmoov metallurgy, kev sib txhuam coefficient yog siab, thiab cov dynamic thiab zoo li qub kev sib txhuam coefficients nyob ze, uas ua rau lub braking smooth, lub suab nrov yog me me, thiab tus nqi kuj tsawg. Hmoov metallurgy cov ntaub ntawv sib txhuam yog siv nyob rau hauv yuav luag txhua qhov chaw tshwj tsis yog tsheb. Nws tuaj yeem ua haujlwm ib txwm nyob rau hauv siab load thiab kub siab, tshwj xeeb tshaj yog rau nws ruaj khov kev sib txhuam coefficient thiab zoo hnav tsis kam. Nws yog siv los ua tus nres nres rau lub dav hlau tsaws, lub pob loj thauj khoom ntsia hlau sib txhuam phaj thiab lub tshuab tsav-tsav clutch phaj. Nyob rau hauv kev thauj mus los machinery xws li tsheb, nkoj, tsheb ciav hlau, thiab lwm yam., nyob rau hauv loj thiab nruab nrab siv machinery xws li bulldozers, mine elevators, excavators thiab tsheb laij teb, thiab kev ua liaj ua teb machinery thiab lub teeb industrial machinery, ntau yam specifications thiab hom hmoov metallurgy kev sib txhuam daim hlau. thiab brake pads raug cais tawm. Kev ua tiav zoo ntawm clutch thiab braking, tab sis kuj txo qis kev siv hluav taws xob thiab txhim kho kev sib kis tau zoo. Nrog rau txoj kev loj hlob ntawm cov cuab yeej siv niaj hnub no, qhov kev thov rau cov khoom siv kev sib txhuam ua haujlwm tau nrawm dua. Cov khoom siv carbon-carbon composite uas tau tshwm sim thaum xyoo 1970s yog cov khoom muaj kev sib txhuam zoo. Nws muaj qhov ruaj khov kub kev sib txhuam kev ua haujlwm, lub neej ntev thiab lub teeb yuag. Nws tau ua tiav zoo siv hauv cov cuab yeej braking ntawm Concord thiab Boeing aircraft. Nws tsuas yog kim thiab cuam tshuam rau ntau yam kev siv. Graphite-raws li kev sib txhuam cov ntaub ntawv nrog kev ua tau zoo nyob rau hauv nruab nrab load, tsis tshua muaj kub thiab ntub kev sib txhuam kuj tau cog lus cov ntaub ntawv tshiab. Nws muab tag nrho cov txiaj ntsig ntawm cov khoom siv asbestos thiab hmoov metallurgy tam sim no thiab pheej yig, ua rau nws zoo tagnrho cov khoom sib txhuam.
