Thermal Cracks - Lub ntsiag to Killer ntawm Nres Nres thiab Yuav Ua Li Cas Lub Hoobkas Tshaj Tawm Tiv Thaiv Lawv

Saib ze ntawm lub ncoo nres tom qab siv hnyav. Koj tuaj yeem pom cov kab nrib pleb me me ntawm qhov sib txhuam - qee qhov ntiav, qee qhov tob, qee qhov ceg zoo li xob laim. Cov no yog thermal tawg, tshwm sim los ntawm huab cua kub gradients uas tshwm sim thaum hnyav braking. Txawm hais tias qhov me me ntawm qhov chaw tawg yog qhov qub thiab tsis muaj teeb meem, qhov sib sib zog nqus los yog lub network tawg tuaj yeem ua rau cov pob tawg, pob txha tawg, thiab nres nres tam sim ntawd. Lub tuam txhab kev lag luam nres tsheb tsim nws cov qauv tsim thiab cov txheej txheem los tiv thaiv thermal tawg, kom ntseeg tau tias cov ntaub qhwv tseem nyob hauv lawv lub neej kev pabcuam tag nrho.

Dab tsi ua rau Thermal Cracks?

Thaum lub nres nres hu rau lub rotor kub, qhov kev sib txhuam ntawm qhov kub thiab txias nce yuav luag tam sim ntawd, thaum lub phaj nraub qaum sab tseem txias heev. Qhov kub sib txawv no - feem ntau ntau pua degrees hla tsuas yog 10-15 hli ntawm cov khoom - tsim thermal stress. Qhov kub saum npoo sim nthuav dav tab sis raug txwv los ntawm cov khoom siv txias hauv qab no. Qhov tshwm sim nro tuaj yeem dhau lub zog ntawm cov khoom sib txhuam, ua rau tawg.

Thermal cracking yog tshwj xeeb tshaj yog nyob rau hauv:

· Kev tsav tsheb hauv roob - Ntev, rov ua dua tshiab ua kom lub ntsej muag kub.
· Towing – hnyav loads nce cua sov input.
· Kev tsav tsheb ua haujlwm - Kev nres ceev ceev ua kom muaj cua sov siab heev.
· Cov ntaub ntawv tsim tsis zoo - Tsawg thermal conductivity lossis siab tawv ua rau muaj kev pheej hmoo tawg.

Yog vim li cas Cracks thiaj li txaus ntshai

Tsis yog txhua qhov tawg yog qhov txaus ntshai tam sim ntawd. Zoo, ntiav "kev kuaj xyuas hluav taws xob" (crazing) yog qhov qub thiab tsis cuam tshuam cov qauv kev ncaj ncees. Txawm li cas los xij, qee cov qauv tawg qhia tias muaj kev pheej hmoo loj:

· Radial tawg - khiav ntawm ntug sab hauv. Cov no tuaj yeem nthuav tawm thiab ua rau cov khoom sib txhuam chunks tawg.
· Los ntawm-tawg - Extending los ntawm kev sib txhuam nto mus rau lub phaj thaub qab. Cov no tuaj yeem tso cai rau lub ncoo cais tawm tag nrho.
· Cov kab nrib pleb – Cov kab sib txuas sib txuas uas ua rau thaj chaw loj tsis muaj zog, ua rau muaj kev tawg sai sai hauv kev sib tsoo nyuaj.

Thaum lub ncoo poob ib chunks ntawm cov khoom sib txhuam, qhov chaw nres tsheb zoo txo ​​qis, thiab cov chunks uas ploj lawm tuaj yeem nyob nruab nrab ntawm lub ncoo thiab rotor, ua rau poob ntawm lub log tam sim ntawd. Qhov no yog kev puas tsuaj loj.

Yuav ua li cas ib lub Hoobkas Professional Resistant Thermal Cracking

1. Thermal conductivity tswj - Raws li tau tham nyob rau hauv ib tsab xov xwm dhau los, cov ntaub qhwv uas ua kom sov tawm ntawm qhov chaw txo cov thermal gradients. Lub Hoobkas sib npaug ntawm cov ntsiab lus hlau fiber ntau kom ua tiav cov conductivity siab txaus kom txo qis gradients tab sis tsis siab heev uas kub ncav cuag lub caliper kua.

2. Tsawg-expansion additives - Qee cov khoom ntim (xws li, cordierite, mullite, lossis lwm yam khoom siv ceramic) muaj coefficients tsawg heev ntawm thermal expansion. Ntxiv 5-15% ntawm cov no rau hauv cov mis txo qhov kev nthuav dav ntawm qhov chaw kub, ncaj qha txo qis thermal stress.

3. Fiber reinforcement - Aramid (Kevlar) thiab carbon fibers ua ntau tshaj li txhim kho kev sib txhuam ruaj khov - lawv txuas micro-cracks, tiv thaiv lawv los ntawm kev loj hlob mus rau hauv cov pob txha loj. Lub Hoobkas xyuas kom meej tias fiber ntau ntev thiab dispersion yog optimized rau tawg kuj. luv luv, thiab lawv tsis muaj kev cuam tshuam; ntev dhau lawm, thiab lawv clump, tsim cov chaw tsis muaj zog.

4. Resin toughness - Txheem phenolic resin yog tawv tab sis nkig. Roj hmab-hloov los yog epoxy-blended resins muaj ntau dua tawg toughness, txhais tau tias lawv muaj peev xwm nqus thermal stress tsis muaj cracking. Kev lag luam tawm yog me ntsis qis dua cov cua sov. Cov kws tshaj lij cov chaw tsim khoom xaiv txoj cai toughness rau daim ntawv thov.

5. Tom qab kho annealing - Qee lub tsev lag luam ntxiv cov kauj ruam txias qeeb tom qab kev kho zaum kawg, tso cai rau kev ntxhov siab sab hauv kom so ua ntej lub ncoo hauv av. Cov kauj ruam yooj yim no tuaj yeem txo cov thermal cracking propensity los ntawm 30-40%.

Kev kuaj rau Crack Resistance

Lub chaw nres tsheb loj loj validates tawg kuj siv:

· Lub sijhawm teem caij dynamometer hnyav - SAE J2784 kev sim ploj mus suav nrog kev nres lub zog siab uas tsim cov thermal gradients tseem ceeb. Tom qab qhov kev xeem, lub ncoo yog tshuaj xyuas rau cov kab nrib pleb nyob rau hauv magnification.
· Kev ntsuas cua sov - Lub ncoo yog rhuab mus rau 400℃thiab ces quenched nrog dej txias (los yog txias los ntawm ib tug moj tej tawg cua txias). Qhov kev hloov pauv kub ceev no hnyav dua li kev tsav tsheb tiag tiag tab sis zoo heev rau kev sib piv cov qauv.
· Kev faib tawm thiab microscopy - Cov ntu ntu ntawm cov ntaub ntawv soj ntsuam tau kuaj xyuas qhov tob thiab qhov ntom ntom. Lub Hoobkas tswj kev lees paub (xws li, "tsis muaj qhov tawg tob tshaj 1.5 hli").

Dab tsi cov neeg yuav khoom yuav tsum thov

Thaum ntsuam xyuas lub Hoobkas nres nres, nug:

· Koj puas kuaj rau thermal tawg? Koj siv txoj kev twg?
· Koj puas siv cov khoom siv qis qis lossis fiber ntau los txhim kho kev tawg?
· Koj puas tuaj yeem muab cov duab ntawm koj cov ntaub qhwv tom qab kuaj dynamometer ploj, qhia qhov sib txhuam saum npoo?
· Koj puas tau muaj ib qho kev ua tsis tiav vim lub ncoo tawg? Koj hais li cas rau lawv?

Lub Hoobkas uas siv thermal cracking tiag tiag yuav muaj cov ntaub ntawv xeem thiab cov tswv yim tsim los qhia. Lub Hoobkas uas tshem tawm qhov teeb meem yuav yog muag cov ntaub qhwv ntsej muag uas muaj kev nyab xeeb tsuas yog nyob rau hauv kev tsav tsheb me me.

Kab hauv qab

Cov kab nrib pleb cua sov yog qhov zais qhov qaug zog ntawm cov pawm nres. Ib lub ncoo uas nres zoo kawg nkaus rau thawj 10,000 km tuaj yeem ua tsis tau zoo tom qab 20,000 km yog tias nws tau sau cov micro-cracks uas nws thiaj li nthuav tawm. Lub koom haum kev tshaj lij sib ntaus sib tua los ntawm cov khoom siv tshawb fawb - cov khoom siv qis qis, cov khoom siv tawv tawv, cov fibers txhawb zog, thiab cov txheej txheem kev ntxhov siab. Raws li tus neeg yuav khoom, kev nkag siab txog qhov kev sib ntaus sib tua tsis pom no pab koj xaiv cov ntaub qhwv uas nyob twj ywm los ntawm qhov nyuaj tshaj plaws, tiv thaiv koj cov neeg siv khoom thiab koj lub koob npe nrov.