Cov ntawv txhaj tshuaj ua ntejyuav tsum yog ua raws li kev xav tias cov pwm tuaj yeem ua qhov loj raws li qhov xav tau. Txawm li cas los xij, txawm tias cov pwm loj tsuas yog kho, qhov loj me ntawm cov khoom yuav txawv nyob ntawm cov shrinkage tiag tiag. Yog li ntawd, hauv qhov tseeb txhaj tshuaj molding, kev tswj ntawm shrinkage yog qhov tseem ceeb heev. Qhov tsim nyog ntawm cov pwm tsim tswj lub ntsej muag shrinkage, uas kuj txawv nrog cov khoom sib txawv txawv ntawm cov cob. Yog tias cov xim hloov pauv, qhov shrinkage yuav tau sib txawv. Nyob ntawm cov tshuab moulding, kev teeb tsa ntawm kev txhaj tshuaj moulding, rov ua dua qub, thiab kev ua haujlwm ntawm txhua lub voj voog moulding hloov pauv, thiab qhov tseeb shrinkage tus nqi hloov pauv. Yog li ntawd, nws tsis yooj yim los tswj kev shrinkage.
1. Lub ntsiab tseem ceeb cuam tshuam rau shrinkage tus nqi pwm tuaj yeem tau los ntawm qhov khoom loj ntxiv rau qhov ua kom tsawg dua, yog li cov ntsiab lus tseem ceeb ntawm cov shrinkage yuav tsum tau xav txog thaum tsim qauv pwm: resin siab resin kub pwm pwm qhov rooj vag hla- ntu kev txhaj tshuaj cheeb tsam lub sijhawm ua kom txias lub sij hawm cov khoom ntsa Kev taw qhia kev txhaj tshuaj nrawm ntawm cov khoom siv tuab tuab Txheeb Resin siab muaj qhov cuam tshuam zoo ntawm cov shrinkage. Yog hais tias tus cob ntsuas qhov loj yog qhov loj, qhov shrinkage yuav dhau los ua me me, thiab cov khoom lag luam loj. Txawm nyob hauv tib qho kab noj hniav, lub tsho tuab txawv nyob ntawm seb cov khoom lag luam zoo li cas, yog li muaj qhov sib txawv hauv shrinkage. Cov pwm ntawm cov kab noj hniav ntau pwm, cov leeg nyob hauv txhua qhov kab noj hniav yog qhov txawv, thiab vim li ntawd, qhov shrinkage ntawm txhua kab noj hniav kuj tseem sib txawv.
Pwm kub
Tsis hais seb nws yog cov roj amorphous lossis cov dej khov siv lead ua, yog tias pwm kub dua, qhov ntsws ntsws yuav loj dua. Txog rau precision molding, lub pwm kub yuav tsum tau tswj ntawm qhov kub tshwj xeeb. Thaum tsim pwm tsim, xim yuav tsum tau them rau tus tsim qauv ntawm lub voj voog cua txias.
Rooj vag hla qhov chaw
Feem ntau hais lus, thaum lub rooj vag qhov chaw hla ntu yog hloov pauv, tus nqi shrinkage kuj hloov. Qhov ua kom poob qis yuav dhau los ua qhov me me thaum lub rooj vag loj dua, uas cuam tshuam rau cov fluidity ntawm lub cob.
Khoom tuab phab ntsa
Lub phab ntsa tuab ntawm cov khoom kuj cuam tshuam cov paib. Rau cov khoom siv tsis-crystalline resins, txoj kev nyiam ntawm txoj kev hnyav los cuam tshuam lub shrinkage tus nqi ntawm phab ntsa thickness yog txawv. Qhov loj dua ntawm cov phab ntsa tuab, qhov ntau dua qhov shrinkage. Ntawm qhov tsis sib xws, cov txheej txheem ntsws yuav ua rau me dua. Rau kev siv lead ua ci ntsa iab, nws yog qhov tsim nyog kom tsis txhob muaj kev hloov tshwj xeeb ntawm cov phab ntsa tuab. Nyob rau hauv cov ntaub ntawv ntawm cov kab noj hniav ntau pwm, yog tias kab noj hniav phab ntsa tuab sib txawv, qhov shrinkage yuav tseem yuav txawv.
Cov khoom siv hloov kho cov ntsiab lus
Thaum cov xaim yog txhawb nrog Borui fiber, qhov ntau dua ntawm cov iav fiber ntau ntxiv, qhov me me poob rau. Tus shrinkage tus nqi nyob rau hauv cov kev taw qhia txaus yog me dua qhov txo qis rau tom kawg. Qhov txawv yog loj dua raws li cov cob. Txhawm rau tiv thaiv kev sib ntswg thiab kev sib dhos, lub rooj vag yuav tsum raug txiav txim siab. Cov duab yoov rau lub rooj vag txoj hauj lwm thiab lub rooj vag naj npawb.
Lub taw qhia
Txawm hais tias muaj qhov sib txawv loj hauv kev qhia, muaj kev qhia rau txhua tus resins. Qhov kev qhia ntawm cov siv lead ua crystalline yog tshwj xeeb loj, thiab nws txawv nyob ntawm phab ntsa tuab thiab molding cov xwm txheej. Tsis tas li ntawd, muaj cov shrinkage tom qab molding, qhov tseem ceeb tshaj plaws yog: kev ntxhov siab sab hauv thiab kev quaj thiab kub thiab av noo
Muaj peev xwm ntsuas tau
Khiav, rooj vag sib npaug
Raws li tau hais los saum toj no, qhov shrinkage nws txawv nrog resin siab. Nyob rau hauv rooj plaub ntawm cov kab noj hniav ib zaug nrog lub rooj vag ntau qhov rooj thiab cov kab noj hniav ntau lub pwm, txhawm rau txhawm rau pwm qhov zoo ib yam, rooj vag sib npaug yog tsim nyog. Resin flow muaj feem xyuam rau qhov kev ntws tawm hauv tus khiav, yog li nws yog qhov zoo tshaj plaws rau qhov sib npaug ntawm cov khiav ua ntej noj lub rooj vag sib npaug.
Muaj kab noj hniav tau kho
Txhawm rau ua kom qhov chaw teeb tsa ntawm molding mob yooj yim, nws yog qhov tsim nyog yuav tsum them sai sai rau kev npaj cov kab noj hniav. Txij thaum molten cob qhia cov cua sov mus rau hauv cov pwm, nyob rau hauv cov ntaub ntawv ntawm cov kab noj hniav dav dav kev npaj, cov pwm kub faib yog qhov tseem ceeb nrog lub rooj vag li qhov nruab nrab. Yog li no, thaum xaiv cov kab noj hniav ntawm cov kab noj hniav ntau ntawm cov pwm, nws yog qhov yuav tsum tau coj qhov sib npaug ntawm qhov khiav thiab cov kev npaj siab nrog lub rooj vag uas yog qhov nruab nrab.
3. Tiv thaiv kev deformation molding
Yog vim li cas rau kev txhaj tshuaj molding kev deformation yog vim muaj kev ntxhov siab nyob sab hauv qab qhov tsis sib txig tsis sib luag, yog li nws yog qhov yuav tsum tau tiv thaiv kom tsis txhob poob qis tsis sib xws. Xws li cov khoom puag ncig nrog lub qhov hauv nruab nrab ntawm cov iav, yuav tsum muab lub rooj vag hauv nruab nrab. Txawm li cas los xij, thaum muaj qhov sib txawv loj ntawm lub shrinkage ntawm lub cob nyob rau hauv cov kev taw qhia ntws thiab txoj kev taw qhia ntsug, nws muaj qhov tsis zoo ntawm ellipse. Thaum qib siab ntau dua ntawm qhov kev ncig ua tiav, yuav tsum muaj 3 lossis 6 rooj vag yog qhov xav tau. Tab sis yuav tsum tau them tag nrho cov nyiaj rau qhov sib npaug ntawm txhua lub rooj vag. Thaum lub rooj vag sab siv, 3-taw rooj vag yuav ua rau kom lub taub puab ntawm cov khoom siv cylindrical. Thaum lub laj kab thaiv lub rooj muag khoom tsis raug tso cai rau sab nrauv thiab qhov kawg, siv lub rooj sib txuas ntawm sab hauv muaj ntau yam xwm yeem, thiab cov txiaj ntsig zoo tuaj yeem tau txais.