(47) Pockmarks Txhaj Molding Txheej Txheem Kev Tswj Xyuas Kev Ua Haujlwm (65 hom)

(1) Dab tsi yog "pitting"?
(2) Yog vim li cas rau tsim "pockmarks"
(3) Tsis txaus tuav
(4) Resin kub thiab pwm kub
(5) Fluidity thiab txhaj tshuaj ceev
(6) Countermeasures rau "pockmarks"
(7) Sim ua kom siab tuav
(8) Cov xwm txheej uas yooj yim rau kev thov thiab tswj lub siab
(1) “pitting” (zoo li cas) yog dab tsi?
"Pits" feem ntau yog xa mus rau "qhov" tsim ntawm cov phab ntsa tuab.
"Pitting" tshwm sim thaum cov resin tsis ua raws li cov kab noj hniav. Muaj ntau yam laj thawj rau cov tsos ntawm pits, tab sis lub ntsiab yog vim li cas yog tsis txaus siab tuav.
(2) Yog vim li cas rau tsim "pockmarks"
(2-1) Kev tuav tsis txaus
Tsuas yog tom qab cov resin raug txhaj rau hauv pwm, nws nto tau solidified, tab sis qhov nruab nrab tsis tau tag nrho solidified. Yog hais tias lub siab tuav nyob rau theem no tsis txaus, lub semi-kho deg yuav tsis ua raws li cov pwm kab noj hniav, uas ua rau cov tsos ntawm cov pits tsis zoo.
(2-2) Resin kub thiab pwm kub
Thaum cov kub kub los yog pwm kub qis, qhov kev kho ntawm cov khoom molded nto yuav nrawm dua, thiab qee zaum nws tsis tuaj yeem siv lub siab tuav. Yog li ntawd, nws yog ib qho yooj yim los tsim undesirable tsos xws li pits.
(2-3) Fluidity thiab txhaj tshuaj tshaj tawm
Thaum lub fluidity ntawm cov khoom tsis zoo, lub sij hawm filling yuav txuas ntxiv, thiab txheej txheej ntawm cov khoom molded tau solidified ua ntej lub siab tuav cov txheej txheem, yog li qee zaum nws tsis tuaj yeem siv lub siab tuav rau cov resin. Yog li ntawd, nws yog ib qho yooj yim los tsim undesirable tsos xws li pits. Thaum qhov kev txhaj tshuaj qeeb qeeb, nws kuj yog ib qho yooj yim los tsim pitting rau tib lub laj thawj.
(3) Countermeasures rau "pockmarks"
(3-1) Sim ua kom lub zog tuav
Ua ntej, sim maj mam nce lub siab tuav qhov chaw. Qhov no yeej daws qhov teeb meem. Hauv qab no yog qhov txuas rau cov khoom siv molding kev pom zoo los ntawm peb lub tuam txhab, thov xa mus rau.
Yog tias muaj lwm yam kev ua txhaum tshwm sim tom qab nce lub siab tuav (xws li flash, thiab lwm yam), nws yog ib qho tsim nyog los teeb tsa "qhov xwm txheej rau kev siv yooj yim ntawm kev tuav"
◆ Pom zoo tuav cov xwm txheej rau ntau yam ntaub ntawv
Resin siab tswj lub sijhawm
Duracon 59 - 98MPa qhov rooj kaw ntxiv rau 1 - 2sec
Duranex 59-98MPa 〃
Fortron 39-69MPa 〃
Vectra 29-49MPa 〃
(3-2) Cov xwm txheej rau kev siv yooj yim ntawm kev tuav lub siab
Cov xwm txheej rau kev siv yooj yim ntawm kev tuav lub siab yog raws li hauv qab no
1. Ua kom cov resin kub
2. Ua kom pwm kub
3. Ua kom nrawm nrawm
4. Loj lub rooj vag (* a)
5. Kho lub thickness (1t ~ 2t yog txaus)
6. Siv cov ntaub ntawv zoo fluidity (* b)
Tom qab hloov cov xwm txheej no, qhov tseeb tuav lub siab siv rau pwm kab noj hniav yuav nce, ua rau nws tsis tshua muaj pitting.