Dab tsi yog qhov laj thawj tseem ceeb rau molding shrinkage?

1, Cov khoom siv tseem ceeb
Cov khoom tseem ceeb ntawm cov ntaub ntawv yog ib qho ntawm cov hauv paus ntsiab lus rau kev tsim shrinkage. Lub cev thiab tshuaj lom neeg cov khoom ntawm cov khoom sib txawv txawv heev, thiab cov kev sib txawv no ncaj qha cuam tshuam rau lawv tus cwj pwm thaum lub sij hawm molding txheej txheem. Piv txwv li, cov ntaub ntawv thermoplastic muaj cov dej ntws tom qab cua sov thiab melting, tab sis yuav muaj shortening thaum lub sij hawm txias thiab solidification txheej txheem vim rearrangement thiab shrinkage ntawm molecular chains; Thaum lub sij hawm ua cov ntaub ntawv hlau, qhov kev hloov pauv yuav tshwm sim vim qhov cuam tshuam ntawm cov yas deformation thiab elastic rov qab. Tsis tas li ntawd, cov ntsuas kev ua tau zoo xws li thermal expansion coefficient, elastic modulus, thiab lub zog tawm ntawm cov ntaub ntawv kuj tseem ceeb rau kev txiav txim siab txog qib ntawm kev tsim shrinkage.
2, Kev tsim cov txheej txheem
Cov txheej txheem molding muaj qhov cuam tshuam ncaj qha thiab tseem ceeb ntawm molding shrinkage. Kev teeb tsa ntawm cov txheej txheem tsis xws li qhov kub thiab txias, siab, thiab lub sijhawm cuam tshuam ncaj qha rau qhov ntws thiab kho tus nqi ntawm cov ntaub ntawv, yog li txiav txim siab qhov kawg loj thiab cov duab ntawm cov khoom molded. Piv txwv li, nyob rau hauv kev txhaj tshuaj molding txheej txheem, yog hais tias qhov kev txhaj tshuaj kub yog siab dhau heev lawm thiab cov khoom melt flowability yog heev zog, lub shrinkage tus nqi nce tom qab txias; Kev txhaj tshuaj tsis txaus tuaj yeem ua rau cov khoom tsis tiav, ua rau hauv kev txhaj tshuaj thiab qhov sib txawv ntawm qhov sib txawv. Tsis tas li ntawd, kev tsim pwm, kev ua kom txias txias, thiab cov txheej txheem tom qab kev kho mob (xws li annealing, laus, thiab lwm yam) kuj tseem ceeb cuam tshuam rau molding shrinkage.
3, Tuag tsim thiab raug raug
Raws li cov cuab yeej tseem ceeb hauv cov txheej txheem molding, kev tsim thiab kev tsim khoom ntawm cov pwm ncaj qha cuam tshuam rau qhov ruaj khov thiab qhov tseeb ntawm cov pwm pwm. Kev tsim pwm tsis tsim nyog, xws li kev xaiv tsis raug ntawm qhov chaw sib cais thiab qhov tsis txaus demolding txoj kab nqes, tuaj yeem ua rau muaj kev pheej hmoo ntawm molding shrinkage. Lub caij no, machining yuam kev, sib dhos clearances, thiab hnav thaum lub sij hawm tsim pwm tuaj yeem ua rau tsis ruaj tsis khov qhov ntev ntawm cov molded qhov chaw. Yog li ntawd, kev txhim kho qhov tseeb ntawm pwm tsim thiab kev tsim khoom yog ib txoj hauv kev zoo los txo cov pwm shrinkage.
4, Environmental yam tseem ceeb thiab qib kev ua haujlwm
Ib puag ncig yam xws li kub thiab av noo tuaj yeem muaj qee yam cuam tshuam rau molding shrinkage. Piv txwv li, thaum lub sij hawm molding ua hauj lwm nyob rau hauv high kub thiab high humidity ib puag ncig, cov khoom yuav nthuav tom qab absorbing noo noo, thiab yuav muaj ntau shrinkage tom qab txias thiab solidification. Tsis tas li ntawd, qib kev txawj ntse thiab kev paub dhau los ntawm cov neeg ua haujlwm kuj tseem yog ib qho tseem ceeb cuam tshuam rau kev tsim ntawm luv luv shrinkage. Cov neeg ua haujlwm txawj ntse tuaj yeem tswj cov txheej txheem tsis tu ncua, txheeb xyuas tam sim thiab daws teeb meem, yog li txo qis kev pheej hmoo ntawm molding shrinkage.
5, Theoretical tsom xam thiab cov lej simulation
Txhawm rau kom nkag siab tob ntxiv ntawm cov laj thawj tseem ceeb ntawm molding shrinkage thiab nrhiav cov kev daws teeb meem zoo, kev tshuaj xyuas theoretical thiab cov lej simulation tau dhau los ua cov kev tshawb fawb tseem ceeb. Los ntawm kev tsim cov qauv tsim, cov qauv ua kom sov, thiab cov qauv ntws ntawm cov ntaub ntawv, nws muaj peev xwm simulate qhov ntws, hloov hluav taws xob, thiab kev coj tus cwj pwm ntawm cov khoom thaum lub sij hawm molding txheej txheem, thiab kwv yees qhov loj thiab cov duab hloov ntawm molded qhov chaw. Cov txiaj ntsig simulation no tuaj yeem tsis tsuas yog muab kev taw qhia rau kev ua kom zoo dua qub, tab sis kuj tseem pab cov neeg tshawb nrhiav kom nkag siab tob txog cov txheej txheem ntawm kev tsim cov shrinkage.