Yog vim li cas thiab kev daws teeb meem rau shrinkage ntawm txhaj tshuaj molded khoom

Tus nqi ntawm kev nthuav dav thiab kev cog lus ntawm cov ntaub ntawv yas hauv cov txheej txheem molding muaj feem xyuam rau cov coefficient ntawm thermal expansion ntawm cov yas ua tiav, thiab cov coefficient ntawm thermal expansion ntawm cov txheej txheem molding yog hu ua "molding shrinkage".
Raws li qhov molded qhov txias thiab kev cog lus, qhov ua kom txias ntawm qhov molded poob los ze ze nrog qhov txias ntawm qhov pwm kab noj hniav. Raws li cov molded ib feem tseem txias, qhov molded ib feem tseem cog lus, thiab tus nqi ntawm shrinkage nyob ntawm seb cov nyhuv ntawm ntau yam. Cov kaum ntse ntse ntawm qhov molded qhov txias tshaj plaws thiab ua kom tawv ua ntej tshaj lwm cov khoom. Qhov tuab nyob ze ntawm qhov nruab nrab ntawm qhov molded yog qhov deb tshaj plaws ntawm qhov chaw txias ntawm cov pwm kab noj hniav, dhau los ua qhov kawg ntawm qhov molded ib feem kom tso cua sov, Tom qab cov khoom ntawm cov npoo thiab cov ces kaum solidifies, raws li cov yaj nyob ze ntawm qhov chaw. lub workpiece txias, lub molded ib feem yuav txuas mus rau daim ntawv cog lus, thiab lub dav hlau ntawm lub ntse ces kaum tsuas yog tau txais unilateral txias, thiab nws lub zog yog tsis siab npaum li cov khoom ntawm lub ntse ces kaum.
Cov cua txias shrinkage ntawm cov khoom yas ntawm qhov nruab nrab ntawm lub workpiece rub tawm sab hauv qhov chaw tsis muaj zog ntawm cov cua txias ib nrab thiab txias txias heev. Qhov no tsim cov dents ntawm qhov chaw txhaj tshuaj molded. Lub xub ntiag ntawm dents qhia tau hais tias qhov shrinkage tus nqi ntawm molding ntawm no yog siab tshaj qhov chaw nyob ib puag ncig. Yog hais tias lub shrinkage ntawm molded ib feem yog siab dua nyob rau hauv ib qhov chaw tshaj li ntawm lwm yam, yog vim li cas rau lub warping ntawm molded ib feem yog. Kev ntxhov siab nyob hauv cov pwm tuaj yeem txo qhov cuam tshuam lub zog thiab kub tsis kam ntawm qhov molded. Qee qhov xwm txheej, kev kho cov txheej txheem tuaj yeem zam kev tsim cov dents. Piv txwv li, thaum lub sij hawm tuav cov txheej txheem ntawm molded ib feem, ntxiv cov khoom yas yog txhaj rau hauv pwm kab noj hniav kom them rau pwm shrinkage. Feem ntau, lub rooj vag yog thinner dua li lwm qhov ntawm cov khoom. Thaum lub molded ib feem tseem kub heev thiab txuas ntxiv mus cog lus, lub rooj vag me me twb solidified. Tom qab solidification, lub siab tuav tsis muaj kev cuam tshuam rau lub molded ib feem nyob rau hauv lub pwm kab noj hniav.
Tej yam ua rau muaj teeb meem:
(1) Cov yas tsis txaus hauv pwm kab noj hniav.
(2) Lub melting kub yog siab dhau los yog tsawg dhau.
(3) Lub ntws channel tsis tsim nyog thiab lub rooj vag seem me dhau.
(4) Puas yog pwm kub tau haum rau cov yam ntxwv ntawm cov yas.
(5) Thaum lub caij txias, qhov chaw nyob rau hauv kev sib cuag nrog cov yas overheats.
(6) Cov nyhuv txias tsis zoo, thiab cov khoom txuas ntxiv zuj zus tom qab demolding.
(7) Cov khoom tsim tsis tsim nyog (kev txhawb nqa ntau dhau, tuab tuab, thiab pom tseeb txawv hauv thickness)
Txoj kev kho:
(1) Txhim kho qhov kev txhaj tshuaj molding.
(2) Kho qhov kub thiab txias ntawm lub tog raj kheej txhaj tshuaj.
(3) Txo qhov kub thiab txias ntawm cov pwm.
(4) Sim ua kom muaj cua txias txaus rau cov khoom.
(5) Txhim kho cov qauv khoom yog qhov ua tau.
(6) Kho cov ntsia hlau ceev kom tau txais qhov tseeb ntsia hlau nto ceev.
(7) Tswj cov pwm kub kom tsim nyog raws li cov yam ntxwv ntawm cov yas siv thiab cov qauv khoom.
(8) Tshawb xyuas seb lub tshev valve puas raug teeb tsa, vim tias kev ua haujlwm txawv txav tuaj yeem ua rau poob siab.
(9) Kho qhov ntws channel kom tsis txhob poob siab ntau; Raws li qhov xav tau tiag tiag, tsim nyog nthuav dav qhov sib txawv ntawm qhov loj me.
(10) Xyuas kom siv cov padding kom raug; Nce lub sij hawm rau pem hauv ntej ntawm cov ntsia hlau; Nce txhaj tshuaj; Nce txhaj molding ceev.