1 、 Ob qhov kub thiab txias uas tsis haum rau kev daws teeb meem shrinkage
1) Cov pwm kub qis dhau lawm, uas tsis tsim nyog los daws qhov teeb meem shrinkage
Cov teeb meem shrinkage ntawm cov roj hmab tawv (surface shrinkage thiab internal shrinkage) yog ib qho teeb meem tshwm sim los ntawm qhov chaw sab laug los ntawm cov concentrated shrinkage tsis tau ntxiv los ntawm molten roj hmab los ntawm cov dej inlet kev taw qhia thaum cov roj hmab molten txias thiab shrunk.
Cov neeg feem coob paub tias qhov kub thiab txiastxhaj tshuaj pwmyog siab dhau, uas yuav yooj yim ua rau shrinkage.Lawv feem ntau nyiam txo cov pwm kub los daws qhov teeb meem.Tab sis qee zaum yog tias pwm kub qis dhau, nws tsis tsim nyog los daws qhov teeb meem shrinkage.Cov pwm kub qis dhau lawm, cov yaj txias dhau sai, thiab cov kua nplaum me ntsis tuab nyob deb ntawm cov dej nkag yog kaw vim tias qhov nruab nrab txias txias dhau, yog li cov yaj tsis tuaj yeem ua kom tiav ntawm qhov deb, uas ua rau nws ntau dua. nyuaj los daws qhov teeb meem shrinkage, tshwj xeeb tshaj yog cov teeb meem shrinkage ntawm tuab txhaj qhov chaw.
Yog li ntawd, thaum daws qhov nyuaj shrinkage teeb meem, nws yog ib qho zoo kom nco ntsoov xyuas cov pwm kub.Cov kws tshaj lij feem ntau kov cov pwm kab noj hniav nrog lawv txhais tes.Txhua yam khoom muaj nws qhov pwm kub zoo.Piv txwv li, lub shrinkage ntawmCov khoom siv PC, tab sis yog tias pwm kub siab dhau lawm, lubtxhaj tshuajyuav txo qis.
2) Tsawg melting kub tsis haum rau kev daws teeb meem shrinkage
Nws kuj tseem paub rau cov neeg feem coob tias yog tias qhov kub thiab txias yog siab dhau, qhov teeb meem ntawm kev txhaj tshuaj molded qhov chaw yog qhov yooj yim tshwm sim.Yog tias qhov ntsuas kub tau raug txo los ntawm 10 ~ 20 ℃, qhov teeb meem shrinkage yuav raug txhim kho.
Txawm li cas los xij, yog tias qhov txhaj tshuaj molded ib feem shrinks ntawm ib feem tuab, ces qhov kub ntawm cov yaj yog hloov qis heev.Piv txwv li, thaum nws nyob ze rau qhov qis qis ntawm kev txhaj tshuaj molded melting kub, nws tsis haum rau kev daws qhov teeb meem shrinkage, thiab txawm tias hnyav dua.Qhov thicker lub txhaj molded ib feem, qhov pom tseeb qhov teeb meem yog.
Yog li ntawd, thaum kho lub tshuab los daws qhov nyuaj shrinkage teeb meem, nws tseem ceeb heev uas yuav tau xyuas seb qhov kub ntawm cov yaj yog tsawg heev.Ntxiv nrog rau saib tus pas ntsuas kub, nws yog qhov yooj yim dua los xyuas qhov kub thiab txias ntawm cov yaj los ntawm kev txhaj tshuaj cua.
2 、 Kev txhaj tshuaj nrawm heev tsis yog qhov tsim nyog los daws qhov teeb meem ntawm lub ntsws loj
Txhawm rau daws qhov teeb meem shrinkage, thawj qhov uas koj yuav xav txog yog txhawm rau txhawm rau txhawm rau txhaj tshuaj thiab ncua sijhawm txhaj tshuaj.Txawm li cas los xij, yog tias qhov kev txhaj tshuaj tau raug kho sai heev, nws tsis yog qhov tsim nyog los daws qhov teeb meem shrinkage.Yog li ntawd, qee zaum thaum shrinkage nyuaj rau kev tshem tawm, nws yuav tsum tau daws los ntawm kev txo qhov kev txhaj tshuaj ceev.
Txo qhov kev txhaj tshuaj nrawm tuaj yeem tsim qhov kub sib txawv ntawm qhov sib txawv ntawm cov yaj hauv pem hauv ntej thiab cov dej nkag, uas yog qhov tsim nyog rau kev ua kom khov thiab pub mis ntawm cov yaj los ntawm qhov deb mus rau ze, thiab tseem ua rau lub siab siab ntxiv ntawm txoj hauj lwm shrinking nyob deb ntawm dej inlet, uas yuav pab tau heev los daws qhov teeb meem.
Tsis tas li ntawd, yog tias qhov kawg theem kawg filling nrog qeeb qeeb, siab dua thiab lub sijhawm ntev tau txais yuav, thiab kev tswj xyuas lub siab ntawm kev maj mam txo qis thiab kev siv zog, cov nyhuv yuav pom tseeb dua.Yog li ntawd, thaum nws tsis tuaj yeem tua ntawm qhov qeeb qeeb thaum pib, nws kuj yog ib qho kev kho zoo rau kev siv cov qauv no los ntawm cov theem tom ntej ntawm kev tua.
Post lub sij hawm: Sep-02-2022