Ntawm cov txheej txheem molding ntau yam ntawm cov pwm yas,txhaj tshuaj molding yog qhov siv ntau tshaj plaws. Txoj kev xav qhia tias kev txhaj tshuaj molding muaj qhov zoo ntawm cov khoom siv muaj zog, lub peev xwm los pwm cov khoom nrog cov txheej txheem nyuaj ib zaug, cov txheej txheem paub tab, cov khoom lag luam siab, thiab cov nqi siv tsawg. Yog li ntawd, txhaj tshuaj molded cov khoom lag luam suav rau qhov feem ntawm cov khoom yas los ntawm lub sijhawm. Nrog rau kev nce ntxiv, cov txheej txheem cuam tshuam, khoom siv, pwm thiab kev tswj hwm kev noj haus kuj tau tsim sai heev.
Thermoplastics yog cov khoom yas uas tuaj yeem ua rau hauv ib qho duab thaum tshav kub, thiab ua raws li cov duab tiav tom qab txias. Yog hais tias nws yog rhuab dua, nws yuav tsum softened thiab melted, thiab ib feem ntawm yas nrog ib tug tej yam zoo li yuav ua tau dua, thiab nws yuav tsum tau rov ua dua, uas yog reversible.
Vim tias cov thermoplastics yog cov ntaub ntawv uas tuaj yeem rov ua kom sov thiab muag muag thiab txias thiab tawv, lawv tuaj yeem rov ua dua thiab tsim los ntawm cua sov thiab yaj, yog li cov khib nyiab ntawm cov thermoplastics feem ntau tuaj yeem rov ua dua thiab rov siv dua, uas yog hu ua "cov khoom siv thib ob. ”. Tom qab shrinkage ntawm txhaj tshuaj molded qhov chaw hais txog tias thaum txhaj tshuaj molded qhov chaw yog molded, ib tug series ntawm kev nyuaj siab yog generated vim lawv lub cev, tshuaj, thiab mechanical hloov. Tom qab txhaj tshuaj molded qhov chaw yog molded thiab solidified, muaj residual stresses. Tom qab txhaj tshuaj molded qhov chaw yog demolded, vim muaj ntau yam residual stresses, Nws yuav ua rau qhov luaj li cas ntawm txhaj molded qhov chaw kom tsawg dua.
Feem ntau, qhov kev txhaj tshuaj molded yuav txo qis hauv 10 teev tom qab demolding, thiab nws yog qhov pib zoo li tom qab 24 teev, tab sis nws yuav siv sij hawm ntev mus txog qhov kawg. Feem ntau hais lus, tom qab shrinkage ntawm thermoplastics yog ntau dua li ntawm cov thermoset plastics, thiab tom qab shrinkage ntawm txhaj tshuaj molded thiab txhaj tshuaj molded qhov chaw yog ntau dua li ntawm shrink-molded txhaj molded qhov chaw.
Post lub sij hawm: Aug-17-2021