Taw qhia:Feem ntau, qhov tseeb ntawm PTFE cov khoom tsis yooj yim rau kev tswj hwm vim nws cov coefficient ntawm linear expansion yog siab dua li cov hlau, thiab nws ib qho ntawm qhov hloov pauv kub nyob ib ncig ntawm chav tsev kub ua rau ntim hloov pauv li ntawm 1 mus rau 2%.Ntxiv mus, nyias-walled PTFE cov khoom tau paub tias yuav nyuaj rau machining vim tsis tsuas yog PTFE saj zawg zog thiab elastic cov ntaub ntawv, tab sis kuj residual kev nyuaj siab nyob tom qab molding tej zaum deform vim kev sib txhuam kub generated thaum lub sij hawm machining txheej txheem los yog vim laus tom qab machining.Xws li deformation tuaj yeem cuam tshuam qhov tseeb qhov tseeb.
Hais txog kev ua kom raug, PTFE cov khoom yog qee zaum yuav tsum muaj tib qhov kev tso cai ntev ntev rau cov khoom siv hlau.Hauv cov xwm txheej zoo li no, cov yam ntxwv ntawm PTFE tau piav qhia saum toj no tuaj yeem ua rau muaj teeb meem ntawm cov neeg siv khoom thiab cov chaw tsim khoom.Nrog rau qhov keeb kwm yav dhau no, daim ntawv qhia no piav qhia txog kev ua tiav ntawm PTFE.
General Permissible Dimensional Tolerance
Cov txheej txheem no teev qhov ntev li ntawm 1 hli mus rau 1000 hli rau thaum cov khoom ntawm PTFE molded khoom yog machined los ntawm compression los yog extrusion molding.Lo lus "general" siv nyob rau hauv tus qauv no txhais tau hais tias tus qauv tuaj yeem siv tau thaum daim ntawv qhia tsis pom cov duab lossis cov cim.
Thaum ntsuas qhov ua tiav ntawm PTFE, cov yam ntxwv tseem ceeb hauv qab no ntawm PTFE yuav tsum
yuav coj mus rau hauv tus account:
1. PTFE muaj thermal conductivity tsawg.
2. PTFE muaj lub siab coefficient ntawm linear expansion.
3. PTFE lub ntim hloov tau zoo heev (los ntawm kwv yees li 1 mus rau 2%) ntawm ib ncig ntawm 23 ° C.
4. PTFE yog elastic.
5. PTFE qee zaum muaj kev ntxhov siab seem.
Los ntawm cov saum toj no, PTFE qhov ntev ntawm qhov kam rau ua yog kwv yees li ± 0.05 hli lossis ib nrab ntawm tus nqi teev tseg hauv JIS K 6884 (qib 1), txawm hais tias PTFE lub machining raug nyob ntawm qhov loj thiab cov duab.
Txawm li cas los xij, vim yog PTFE qhov elasticity, qhov tseeb tus nqi yuav txawv yog tias qhov kawg ntawm lub ntsuas ntsuas raug thawb tawm tsam PTFE cov qauv.Piv txwv li, qhov sib txawv ntawm tsawg kawg yog 0.1 hli hauv qhov ntsuas qhov ntsuas qee zaum tshwm sim nyob ntawm seb lub micrometer raug thawb tawm tsam PTFE tus qauv.Cov neeg siv khoom thiab cov neeg tsim khoom yuav tsum xav txog qhov no.
Cov teebmeem ntawm kev kho Annealing
Feem ntau, cov txheej txheem dawb sintering (baking) yog siv rau PTFE tom qab compression molding.Thaum lub sij hawm sintering, PTFE qhov kev ntxhov siab sab hauv tuaj yeem txo qis piv nrog cov khoom molded nrog cov txheej txheem coining (ib txoj kev uas cov khoom yog sintered nyob rau hauv pwm thiab ces txias nyob rau hauv siab) uas txheej txheej yog quenched.
Txawm li cas los xij, annealing * kev kho mob yog siv rau cov khoom siv nyob rau hauv cov ntaub ntawv siab qhov tseeb yuav tsum tau los yog cov khoom zoo li complex.
Tshem tawm cov kev ntxhov siab sab hauv tsim thaum lub sij hawm molding txheej txheem yog ib txoj hauv kev zoo los txhim kho qhov tseeb qhov tseeb thiab tiv thaiv los ntawm nws cov kev hloov pauv raws sijhawm.
* Annealing: Ib txheej txheem uas cov khoom molded tau maj mam txias ntawm qhov kub thiab txias kom tshem tawm cov kev ntxhov siab sab hauv los ntawm kev kub ntxhov lossis kev ntxhov siab.
Nto Roughness
Raws li tau teev tseg hauv General Tolerance rau Polytetrafluoroethylene (Machine Cut), cov yam ntxwv ntawm cov khoom yuav tsum raug coj mus rau hauv tus account thaum teeb tsa tus nqi nto-roughness.
Txij li cov resin raug cuam tshuam los ntawm tshav kub thaum lub sij hawm machining ntawm qhov chaw thiab muaj elasticity, qhov saum npoo-roughness tus nqi yuav tsis sib npaug zos rau cov machined hlau nto.
Feem ntau, qhov sib txawv ntawm qhov ua tiav ntawm qhov roughness yog tshwm sim los ntawm machining tej yam kev mob xws li rotational thiab pub ceev thiab txiav cov cuab yeej (blades).
Cov cim qub tau qhia txog kwv yees li 60 xyoo dhau los, thiab yog li paub zoo.Nws yuav siv sij hawm rau cov cim tshiab kom paub txog ntawm cov neeg tsim khoom lag luam peripheral.Tsis tas li ntawd, nyob rau hauv cov ntaub ntawv ntawm kev ua haujlwm, cov txheej txheem uas twb muaj lawm yuav ua raws li.Yog li ntawd, nws yog ib qho tseem ceeb kom nkag siab txog kev sib raug zoo ntawm cov cim tshiab thiab qub.
Post lub sij hawm: Jan-14-2019