Cov txheej txheem yas molding thiab pwm tsim yog qhov tseem ceeb ntawm kev tsim khoom niaj hnub no, sib koom ua ke txiav txim siab qhov zoo, tus nqi, thiab kev ua haujlwm ntawm cov khoom yas. Yas molding yog hais txog cov txheej txheem ntawm softening los yog melting yas raw cov ntaub ntawv los ntawm cua sov thiab pressurization, ces txhaj lawv mus rau hauv ib lub pwm los tsim cov yam xav tau. Pwm tsim, ntawm qhov tod tes, suav nrog kev tsim cov qauv pwm tsim raws li cov khoom tsim, qhov loj me, thiab cov kev xav tau zoo los xyuas kom meej molding ntawm cov khoom yas.
Muaj ntau hom yas molding txheej txheem, nrog rau kev txhaj tshuaj molding, extrusion molding, tshuab moulding, thiab compression molding. Ntawm cov no, kev txhaj tshuaj molding yog cov txheej txheem siv dav tshaj plaws, tsim nyog rau kev tsim cov khoom yas nrog cov duab nyuaj thiab qhov yuav tsum tau muaj qhov raug siab. Hauv kev txhaj tshuaj molding, cov khoom siv yas yog rhuab mus rau lub xeev molten thiab txhaj rau hauv pwm kab noj hniav nyob rau hauv siab. Tom qab txias thiab solidification, cov khoom tau txais. Pwm tsim yog ib qho tseem ceeb nyob rau hauv cov txheej txheem no, xav tau tsis tsuas yog los xyuas kom meej cov duab thiab qhov ntev ntawm qhov tseeb ntawm cov khoom, tab sis kuj yuav tsum xav txog cov teeb meem xws li demolding thiab venting.
Pwm tsim yog cov txheej txheem nyuaj thiab ua tib zoo, nrog rau ntau yam xws li xaiv cov khoom siv, kev tsim qauv, thiab kev tsim khoom. Nyob rau hauv cov nqe lus ntawm kev xaiv cov khoom, pwm cov ntaub ntawv yuav tsum muaj cov yam ntxwv xws li siab hardness, siab hnav tsis kam, thiab corrosion kuj siab los xyuas kom meej cov pwm qhov kev pab cuam lub neej thiab cov khoom zoo. Nyob rau hauv cov nqe lus ntawm kev tsim qauv, pwm yuav tsum tau rationally tsim raws li cov duab thiab loj yuav tsum tau ntawm cov khoom, nrog rau cov kab noj hniav, rooj vag, thiab venting raws, kom ntseeg tau tias cov yas raw khoom yuav smoothly sau cov kab noj hniav thiab tshem tawm cov roj. Tib lub sijhawm, tus qauv tsim pwm kuj yuav tsum xav txog qhov ua tau ntawm cov txheej txheem tsim khoom, xws li kev ua haujlwm raug thiab kev sib dhos nyuaj.
Dhau li ntawm kev txhaj tshuaj molding, extrusion molding yog lwm cov txheej txheem yas molding. Nws yog qhov tsim nyog rau kev tsim cov khoom txuas ntxiv - cov khoom yas zoo li cov kav dej, cov pas nrig, thiab cov ntawv. Nyob rau hauv extrusion molding, cov khoom siv yas yog rhuab mus rau lub xeev molten, thiab tom qab ntawd txuas ntxiv mus rau hauv pwm los ntawm kev sib hloov thiab thawb ntawm extruder ntsia hlau. Hauv cov txheej txheem no, kev tsim pwm yog qhov tseem ceeb sib npaug; nws yuav tsum xyuas kom meej cov duab thiab qhov tseeb ntawm cov khoom thiab xav txog cov teeb meem xws li cov khoom txias thiab traction.
Tshuab moulding yog tsim los tsim cov khoom yas hollow, xws li lub raj mis thiab thoob. Hauv tshuab moulding, cov khoom siv yas yog rhuab mus rau lub xeev molten thiab ces tshuab mus rau hauv pwm siv lub tshuab moulding tshuab. Huab cua siab yog siv los ua kom cov yas rau hauv cov pwm.
Thaum lub sij hawm tus txheej txheem no, cov pwm tsim yuav tsum xyuas kom meej cov phab ntsa tuab, zoo zoo, thiab daws teeb meem xws li cua thiab cua txias.
Compression molding, ntawm qhov tod tes, yog cov txheej txheem yas molding yooj yim tsim nyog rau kev tsim cov khoom yas nrog cov duab yooj yim thiab qhov loj dua. Hauv compression molding, cov khoom siv yas yog muab tso rau hauv pwm, softened los ntawm cua sov thiab pressurizing, thiab nyob rau hauv lub pwm kab noj hniav. Tom qab txias thiab solidification, cov khoom tau txais. Hauv cov txheej txheem no, tus tsim pwm yuav tsum tau ua kom cov duab thiab qhov tseeb ntawm cov khoom thiab hais txog cov teeb meem xws li demolding thiab venting.
