Yuav ua li cas nrog lub shrinkage ntawm txhaj tshuaj molding khoom?
1.Qhov kub pwm tsawg dhau tsis haum rau kev daws qhov teeb meem ntawm qhov shrinkage
Qhov teeb meem shrinkage ntawm cov khoom yas tawv (surface shrinkage thiab internal shrinkage kab noj hniav) yog tshwm sim los ntawm qhov tseeb hais tias qhov chaw seem ntawm cov concentrated shrinkage tsis tuaj yeem ua kom tiav los ntawm cov yaj los ntawm cov kev taw qhia ntawm cov dej inlet thaum cov yaj shrinks thaum nws txias. Yog li ntawd, yam uas tsis haum rau kev pub mis yuav cuam tshuam rau peb los daws qhov teeb meem ntawm kev poob qis.
Cov neeg feem coob paub tias pwm kub siab dhau los ua rau muaj teeb meem shrinkage, thiab feem ntau nyiam txo qhov pwm kub los daws qhov teeb meem. Tab sis qee zaum yog tias pwm kub qis dhau, nws tsis yog qhov tsim nyog los daws qhov teeb meem ntawm qhov shrinkage, uas tsis pom los ntawm ntau tus neeg.
Cov pwm kub qis dhau lawm, cov kua nplaum yaj ua kom txias sai heev, thiab cov kua nplaum me ntsis thicker nyob deb ntawm cov dej nkag, vim tias qhov nruab nrab txias txias dhau lawm, cov khoom noj tau raug thaiv, thiab cov kua nplaum tsis tuaj yeem yaj tag nrho hauv cov dej. nyob deb. Supplementation, ua rau cov teeb meem shrinkage nyuaj los daws, tshwj xeeb tshaj yog cov teeb meem shrinkage ntawm tuab thiab loj txhaj molded qhov chaw.
Tsis tas li ntawd, cov pwm kub yog qhov tsawg dhau, uas tsis yog qhov tsim nyog los ua kom lub zuag qhia tag nrho shrinkage ntawm kev txhaj tshuaj molded qhov chaw, ua rau cov concentrated shrinkage, thiab cov teeb meem shrinkage yog qhov hnyav thiab pom tseeb.
Yog li ntawd, thaum daws qhov nyuaj shrinkage teeb meem, nws yuav ua tau zoo kom nco ntsoov xyuas cov pwm kub. Cov kws tshaj lij kws tshaj lij feem ntau kov cov pwm kab noj hniav nrog lawv txhais tes kom pom tias nws txias dhau lossis ntxhib dhau. Txhua cov khoom siv raw muaj nws qhov kub thiab txias. Piv txwv li, qhov teeb meem shrinkage ntawm cov khoom siv PC tuaj yeem txhim kho yog tias lub qhov raug kaw kom zoo, tab sis yog tias pwm kub siab dhau lawm, qhov teeb meem ntawm shrinkage ntawm txhaj tshuaj molded qhov chaw yuav tshwm sim.
2. Tsawg melting kub yog tsis conducive mus daws qhov shrinkage teeb meem
Tsis tas li ntawd, cov neeg feem coob paub tias yog tias qhov kub ntawm melting siab dhau lawm, qhov kev txhaj tshuaj molded yog qhov ua rau shrinkage. Yog tias qhov ntsuas kub kom tsim nyog qis dua 10 ~ 20 degree, qhov teeb meem shrinkage yuav raug txhim kho.
Txawm li cas los xij, yog tias qhov kev txhaj tshuaj molded shrinks nyob rau hauv ib tug thicker ib feem, kho lub melting kub tsawg dhau lawm, piv txwv li, thaum nws nyob ze rau qhov qis qis ntawm qhov kev txhaj tshuaj melting kub, nws tsis yog qhov tsim nyog los daws cov teeb meem shrinkage, thiab ntau dua. loj. Lub thicker daim, qhov pom tseeb nws yog.
Qhov laj thawj zoo ib yam li cov pwm kub tau qis dhau. Cov kua nplaum molten condenses sai heev, thiab qhov kub thiab txias sib txawv uas zoo rau kev pub mis tsis tuaj yeem tsim los ntawm txoj haujlwm shrinking thiab lub nozzle. Txoj kev noj zaub mov ntawm txoj haujlwm shrinking yuav raug thaiv thaum ntxov, thiab qhov teeb meem yuav raug daws. ua nyuaj. Nws tseem tuaj yeem pom tias qhov nrawm nrawm ntawm cov kua nplaum yaj, qhov tsis zoo rau kev daws teeb meem shrinkage.
Tsis tas li ntawd, kub melting tsawg dhau los kuj tsis tsim nyog rau kev nce tus nqi ntawm tag nrho cov shrinkage, uas ua rau muaj kev nce hauv cov concentration ntawm cov ntsiab lus shrinkage, yog li aggravating qhov teeb meem shrinkage.
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 kev 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 ceev heev tsis yog qhov tsim nyog rau kev daws qhov teeb meem ntawm qhov shrinkage loj
Txhawm rau daws qhov teeb meem shrinkage, thawj yam uas los rau hauv lub siab yog txhawm rau txhawm rau txhawm rau txhaj tshuaj thiab ncua sijhawm txhaj tshuaj. Tab sis yog tias qhov kev txhaj tshuaj nrawm tau hloov kho sai heev, nws tsis yog qhov tsim nyog los daws qhov teeb meem shrinkage. Yog li ntawd, thaum lub shrinkage yog nyuaj rau tshem tawm, nws yuav tsum tau daws los ntawm kev txo cov kev txhaj tshuaj ceev.
Txo qhov kev txhaj tshuaj nrawm tuaj yeem ua rau qhov kub thiab txias sib txawv ntawm cov kua nplaum molten taug kev nyob rau hauv pem hauv ntej thiab cov dej nkag, uas yog qhov tsim nyog rau kev sib xyaw ua ke thiab kev pub mis ntawm cov kua nplaum molten los ntawm deb mus rau ze, thiab nws kuj yog qhov tsim nyog rau txoj haujlwm shrinkage nyob deb. los ntawm lub nozzle. Tau txais cov tshuaj tiv thaiv kev ntxhov siab ntau dua tuaj yeem mus ntev rau kev daws teeb meem.
Vim tias qhov txo qis ntawm kev txhaj tshuaj nrawm, qhov kub ntawm cov kua nplaum yaj hauv pem hauv ntej yog qis dua, thiab qhov ceev tau qeeb, thiab qhov kev txhaj tshuaj molding tsis yog ib qho yooj yim los tsim kom muaj lub ntsej muag ntse, thiab kev txhaj tshuaj siab thiab lub sijhawm tuaj yeem ua tau. nce thiab ntev, uas yog ntau conducive rau daws qhov teeb meem ntawm loj shrinkage.
Tsis tas li ntawd, yog tias qhov kawg-theem kawg-filling nrog qeeb qeeb, siab dua thiab lub sij hawm ntev thiab txoj kev tuav lub siab ntawm maj mam qeeb thiab pressurizing yog saws, cov nyhuv yuav pom tseeb dua. Yog li ntawd, nws kuj yog ib txoj kev zoo los siv txoj kev no los ntawm cov theem tom qab ntawm kev txhaj tshuaj thaum nws tsis tuaj yeem siv qhov kev txhaj tshuaj qeeb qeeb thaum pib.
Txawm li cas los xij, nws tsim nyog nco ntsoov tias qhov txhaws qeeb dhau, tab sis nws tsis yog qhov tsim nyog los daws qhov teeb meem ntawm shrinkage. Vim tias thaum cov kab noj hniav puv lawm, cov kua nplaum uas tau yaj tag yog khov, ib yam li qhov kub ntawm cov kua nplaum melted tsawg dhau lawm, tsis muaj peev xwm pub cov shrinkage nyob deb.