Cov txheej txheem molding koom nrog cov kauj ruam hauv qab no: kev tso nkag thiab preheating ntawm cov ntxig, kev sib cav, tuav, kom paub, thiab tu cov pwm. Tam sim no, Kuv yuav qhia txhua kauj ruam kom meej rau koj.
1. Ntxig Tso Rau
Cov ntxig feem ntau yog ua los ntawm cov hlau thiab tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom. Cov khoom lag luam nrog cov ntxig feem ntau muaj kev txhim kho tseem ceeb hauv cov khoom siv neeg kho tshuab. Qee cov ntxig tau ntxiv rau muab cov khoom hluav taws xob kev coj ua, thermal conductivity lossis lwm yam khoom muaj nuj nqi. Nws raug nquahu kom preheat ua ntej tso cov ntxig.
Feem ntau, cov kev ntxig tau muab tso rau ntawm tes. Txoj kev tso kawm yuav tsum yog qhov tseeb thiab ruaj khov. Rau cov ntxig me me, cov plav lossis cov quab yuam kuj tseem tuaj yeem siv rau kev teeb tsa. Ib qho ntawm cov khoom tuaj yeem siv ib daim ntxig, lossis ntau cov ntxig sib txawv tuaj yeem tso. Txoj hauj lwm yuav tsum tsis yog tsis ncaj ncees los yog skewed. Cov ntxig yuav tsum ruaj khov. Yog tias tsim nyog, lawv yuav tsum tau tsau kom tiv thaiv kev tsis txaus siab lossis kev ua haujlwm. Txwv tsis pub, lub hom phiaj ntawm kev siv cov ntxig tsis tuaj yeem ua tiav, thiab cov khoom yuav raug kaw lossis txawm tias pwm yuav raug puas.
2. Ntxiv cov ntaub ntawv
Qhov tseeb ntawm tus nqi ntawm cov khoom ntxiv yuav cuam tshuam ncaj qha rau qhov loj me thiab ntom ntawm cov khoom. Yog li ntawd, nws yog qhov tsim nyog yuav ntsuas qhov ntau thiab tusyees ntxiv cov khoom siv rau hauv cov khoom noj kab noj qab zib. Cov hau kev ntawm kev muaj tseeb ntxiv muaj xws li: qhov hnyav txheej txheem, suav txoj kev thiab ntau txoj kev.
Txoj kev gravimetric yog qhov tseeb tab sis yog cumbersome. Nws yog feem ntau siv rau cov ntaub ntawv nrog cov khoom muaj tseeb loj thiab cov uas nyuaj rau kev siv tus txheej txheem volumetric, xws li powdery lossis fibrous tshuaj.
Tus txheej txheem volumetric tsawg dua yog qhov tseeb dua li cov qauv gravimetric, tab sis nws yooj yim dua ua haujlwm thiab feem ntau siv rau cov hmoov kev ntsuas.
Txoj kev suav suav tsuas yog siv rau kev thauj khoom ua ntej -}} nias cov ntaub ntawv.
Cov Lus Cim: Ua ntej ntxiv cov khoom siv, nws yog qhov tsim nyog los ua ntej kos yog tias muaj cov roj stains, burris, khib nyiab lossis lwm yam khoom txawv teb chaws lossis lwm yam khoom txawv teb chaws. Ntxiv cov khoom ntsuas raug raws li cov duab ntawm cov kab noj hniav, thiab sau kom ntau li ntau tau nyob hauv qee thaj chaw nrog kev khiav siab tsis kam. Them sai sai rau cov seem uas nyuaj rau sau (xws li protrusion, me me, nqaim rau qhib), thiab ntxiv cov khoom siv ntau rau cov ntu no. Txhawm rau pab txhawb 排气, nws yog qhov zoo tshaj plaws los ua kom cov khoom tiv thaiv nyob hauv nruab nrab thiab tso cov khoom siv ib puag ncig ua ntej thiab nias nws khov kho. Qhov no tuaj yeem txo qhov kev cuam tshuam ntawm cov khoom ntws ntawm cov tub ntxhais, thiab yuav tsis muaj "cov khoom khiav tawm hauv lub qhov ntawm cov tub ntxhais. Yog tias nws yooj yim ntxiv cov khoom siv nyob rau hauv cov duab ntawm pre-}} nias cov khoom tiav, nws raug nquahu kom ua li ntawd.
3. Pwm kaw
Pwm kaw tau muab faib ua ob theem. Ua ntej Punch tau sib chwv nrog cov khoom siv, nws yuav tsum kaw ntawm qhov siab siab (1.5 - 3.0 mpa. Qhov no tuaj yeem ua kom lub voj voog ua kom luv thiab tiv thaiv cov yas ntawm kev hloov pauv. Tom qab punch nkag mus rau hauv kev sib cuag nrog cov khoom siv, lub nrawm yuav tsum tau maj mam qeeb thiab lub siab ({} mpa) siv rau qeeb qeeb. Qhov no yog kom tsis txhob ua rau muaj kev nkag siab thiab tshem tawm cov huab cua hauv pwm.
4. Qhov cua
Txhawm rau tshem tawm cov huab cua, noo noo thiab cov tshuaj tsw qab los ntawm cov pwm, tom qab pwm kaw, qee lub sijhawm, nws yog ib qho tsim nyog los qhib pwm rau ib lub sijhawm. Tus txheej txheem no yog hu ua cua. Kev ntsuas cua yuav tsum tau nqa tawm sai li sai tau thiab yuav tsum ua tiav ua ntej cov khoom tau muaj. Txwv tsis pub, cov khoom yuav ua rau tawv thiab poob nws cov plasterity. Txij ntawm no, txawm tias cov pwm qhib, huab cua tsis tuaj yeem raug cua, thiab txawm tias qhov kub thiab lub siab tau nce ntxiv. Qhov cua muaj peev xwm ua kom lub sijhawm kho thiab txhim kho cov tshuab thiab hluav taws xob ntawm cov khoom. Txhawm rau zam qhov tshwm sim ntawm txheej txheej hauv cov khoom, nws tsis yog qhov ua kom zoo nkauj dhau los lossis lig dhau lawm. Kev ua pa tau dhau los ntxov yuav tsis ua tiav lub hom phiaj, thiab ua kom cov nplaim dej dhau los, cov khoom siv tau tsim kho lawm, thiab cov roj tsis tuaj yeem siv.
5. Kho
The process by which materials change from a flowing state to a hard, non-melting and non-dissolving state is called the curing of thermosetting resins. Dab tsi yog xa mus rau kev kho ntawm no qhov tseem ceeb yog hais txog tus kho tus nqi, uas yog, tus nqi ntawm kev ruaj khov. It is the speed at which the plastic changes to a non-melting and non-dissolving state within the mold during the standard molding of the sample. Nws feem ntau yog qhia hauv (s / cm tuab). Tus nqi kho tau zoo sib xws nrog cov khoom ntawm cov yas, ua ntej} {{} cua sov thiab siab, thiab lwm yam.
Qhov ceev ntawm kev kho yog nyob ntawm tus nqi uas qhov qis {} molecular {}} molecular {}} phaus hnyav. Qhov ntawd yog, kev kho lub ntsej muag yog cuam tshuam nrog cov qauv molecular ntawm cov cob. Piv txwv li, thermosetting phenolic resins muaj cov txheeb ze hnyav thiab tsawg dua cov neeg sawv cev tuaj yeem yooj yim thiab cov pab pawg ceev nrawm. Nrog tus txheeb ze siab dua molecular hnyav thiab ntau dua viscosity, nws tsis tshua muaj peev xwm rau cov hws ntawm cov pab pawg nquag (hydroxymethyl), yog li kho kom qeeb. Qhov ceev ntawm kev kho ncaj qha cuam tshuam rau kev ua tau zoo. Txhawm rau ua kom nrawm dua ntawm thermosetting plastics, qee zaum qee tus neeg tua neeg tau ntxiv thaum lub sij hawm moulding txheej txheem. Piv txwv li, Hexamethylenetretabine tuaj yeem raug ntxiv rau thermosetting Phees Moulding hmoov; Oxalic acid tuaj yeem raug ntxiv rau urea -} formaldehyde moulding hmoov. Qee cov neeg ua haujlwm hauv Inorganic fitters tseem muaj kev cuam tshuam rau kev kho cov hmoov ntawm cov tshuaj molding. Piv txwv li, Chockides lossis hydroxides ntawm cov hlau nplaum tuaj yeem ua kom nrawm nrawm ntawm Phexolic Moulding hmoov.
6. Tuav lub sijhawm siab
Thaum lub sij hawm tus txheej txheem cob qhia nyob rau hauv pwm, nws yog ib txwm nyob rau hauv cov kub kub thiab siab siab. Lub sijhawm yuav tsum tau los ntawm kev pib cua sov, kev ntsuas cua sov, kom ua tiav ntawm kev kho thiab lub sijhawm txias thiab kev lag luam yog hu ua lub sijhawm tuav siab. Qhov tseem ceeb, tuav lub sijhawm siab yog lub sijhawm kom tswj qhov kub thiab siab. Nws yog kiag li nrog kev kho kom nrawm. Yog tias lub sijhawm tuav lub sijhawm luv heev, uas yog, yog tias cov cua txias thiab cov khoom siv tsis tiav, nws yuav ua rau cov khoom siv hluav taws xob tsis tiav, nws yuav ua rau cov khoom siv hluav taws xob tsis tiav, nws yuav ua rau cov khoom siv hluav taws xob tsis tiav, nws yuav ua rau cov khoom siv hluav taws xob ua tiav, nws yuav ua rau cov khoom siv hluav taws xob, nws yuav ua rau cov khoom siv hluav taws xob ua tiav, nws yuav ua rau cov khoom siv hluav taws xob, thiab kub ua rau cov khoom. Nyob rau tib lub sijhawm, tom qab cov khoom tau hais txog, nws tseem yuav ua kom qis dua thiab ua rau muaj kev sib cav. Yog tias lub sijhawm tuav lub sijhawm ntev heev, nws tsis yog txuas ntxiv cov khoom sib tw tab sis kuj tseem muaj kev ntxhov siab ntau dhau los, thiab kev ntxhov siab sab hauv nruab nrab ntawm lub cob thiab cov fillers. Thaum muaj mob hnyav, cov khoom yuav tawg. Yog li ntawd, lub sijhawm uas tsim nyog tuav tau txiav txim siab raws li cov khoom siv yas. Tsis ntev ntev thiab luv heev yog qhov haum. Feem ntau, thaum lub sij hawm moulding txheej txheem, lub sijhawm kho tau raug kho kom haum li 30 lij thiab ob peb feeb.
7. Txhim kho
Kev txhais tau ib txwm ua tiav los ntawm kev siv lub laub (tawm) qws. Rau cov khoom lag luam nrog kev sib sau cov pas nrig lossis qee cov kev ntxig, cov pas nrig sib haum thiab lwm cov khoom siv yuav tsum tau txais cov cuab yeej tshwj xeeb ua ntej kev puas tsuaj tuaj yeem nqa tawm.
8. Ntxuav cov pwm
Txij li thaum muaj qee cov ntaub ntawv tseem ceeb thiab cov burrs sab laug hauv cov pwm thaum lub pwm ua ke, cov pwm yuav tsum huv tom qab txhaj tshuaj moulding. Yog tias cov tshuaj ntsuab uas muaj cov khoom siv hloov pauv, lawv tuaj yeem tshem tawm siv cov ntawv tooj liab lossis so nrog cov neeg sawv cev polishing. Tom qab tu, thov ib tus neeg sawv cev tso tawm los pab txhawb cov tshuaj moulding tom ntej.
9. Post - kev kho
Txhawm rau txhim kho qhov zoo ntawm cov khoom, tom qab cov khoom yog qhov nyuaj, lawv feem ntau yuav tsum tau kho ntawm qhov kub ntau dua. Qhov ntsuas kub rau post - kev kho mob sib txawv nyob ntawm seb hom yas. Lub hom phiaj ntawm Post - kev kho yog:
Xyuas kom meej tias cov khoom yas muaj kev kho kom zoo.
Txo cov dej noo thiab cov tshuaj tsis huv hauv cov khoom los txhim kho nws cov hluav taws xob.
Tshem tawm cov kev ntxhov siab sab hauv ntawm cov khoom lag luam, thiab lwm yam.
Thaum lub sijhawm post -}}}}}}}}}}}}}}}}}}}}}}}}}}} Txoj Kev Kho Kom Qhuav, cov khoom kuj tseem yuav hloov pauv thiab hloov chaw nyob sab nraud. Qee zaum, warping thiab tawg yuav txawm tshwm sim. Yog li ntawd, tus tshaj tawm -} kev kho mob yuav tsum tau tswj hwm nruj me ntsis.