Warpage deformation yog ib qho tsis xws luag hauv kev txhaj tshuaj molding ntawm nyias plhaub yas qhov chaw.Feem ntau ntawm warpage deformation tsom xam tau txais kev soj ntsuam zoo, thiab kev ntsuas yog coj los ntawm cov khoom tsim, pwm tsim thiab kev txhaj tshuaj molding txheej txheem kom tsis txhob muaj kev sib tsoo loj heev kom deb li deb tau.Piv txwv li, qee yam khoom siv yas,yas khau racks, yas clips, yas brackets, lwm
Nyob rau hauv cov nqe lus ntawm pwm, txoj hauj lwm, daim ntawv thiab tus naj npawb ntawm cov rooj vag ntawm txhaj tshuaj pwm yuav cuam tshuam lub filling lub xeev ntawm yas nyob rau hauv lub pwm kab noj hniav, uas ua rau lub deformation ntawm yas qhov chaw.Txij li thaum warpage deformation muaj feem xyuam rau qhov tsis sib xws, kev sib raug zoo ntawm shrinkage thiab cov khoom warpage yog soj ntsuam los ntawm kev kawm txog kev coj tus cwj pwm ntawm cov yas sib txawv hauv cov txheej txheem sib txawv.Nws suav nrog kev cuam tshuam ntawm cov thermal residual kev nyuaj siab ntawm warpage deformation ntawm cov khoom, thiab lub zog ntawm plasticization theem, pwm filling thiab txias theem thiab demoulding theem ntawm warpage deformation ntawm cov khoom.
Cov nyhuv ntawm shrinkage ntawm txhaj tshuaj molded khoom ntawm warping deformation tov:
Qhov ncaj qha ua rau warpage deformation ntawm txhaj tshuaj molded khoom nyob rau hauv lub uneven shrinkage ntawm yas qhov chaw.Rau kev tsom xam warpage, shrinkage nws tus kheej tsis tseem ceeb.Qhov tseem ceeb yog qhov sib txawv ntawm shrinkage.Nyob rau hauv cov txheej txheem ntawm kev txhaj tshuaj molding, vim qhov kev npaj ntawm polymer molecules raws cov kev taw qhia ntws, lub shrinkage ntawm molten plastics nyob rau hauv cov kev taw qhia ntws yog ntau dua li nyob rau hauv txoj kab ntsug, ua rau warpage thiab deformation ntawm txhaj tshuaj.Feem ntau, cov shrinkage tsis sib xws tsuas yog ua rau muaj kev hloov pauv ntawm qhov ntim ntawm cov khoom yas, thiab tsuas yog cov shrinkage tsis sib xws tuaj yeem ua rau warpage deformation.Qhov sib txawv ntawm qhov shrinkage tus nqi ntawm crystalline plastics nyob rau hauv cov kev taw qhia ntws thiab ntsug kev taw qhia yog loj dua li ntawm amorphous plastics, thiab nws shrinkage tus nqi kuj loj dua li ntawm amorphous plastics.Tom qab lub superposition ntawm qhov loj shrinkage tus nqi ntawm crystalline plastics thiab lub anisotropy ntawm shrinkage, lub nyiam ntawm warping deformation ntawm crystalline plastics yog ntau loj dua li ntawm amorphous plastics.
Multistage txhaj tshuaj molding txheej txheem xaiv raws li kev soj ntsuam ntawm cov khoom geometry: vim yog cov kab noj hniav sib sib zog nqus thiab nyias phab ntsa ntawm cov khoom, cov pwm kab noj hniav yog qhov ntev thiab nqaim channel.Thaum cov yaj ntws los ntawm qhov no, nws yuav tsum dhau mus sai, txwv tsis pub nws yooj yim kom txias thiab khov, uas yuav ua rau muaj kev pheej hmoo ntawm kev txhaws cov kab noj hniav.Kev txhaj tshuaj nrawm yuav tsum tau teeb tsa ntawm no.Txawm li cas los xij, kev txhaj tshuaj ceev ceev yuav coj ntau lub zog kinetic rau yaj.Thaum cov yaj ntws mus rau hauv qab, nws yuav ua rau muaj kev cuam tshuam zoo inertial, ua rau lub zog poob thiab ntug dej.Nyob rau lub sijhawm no, nws yog ib qho tsim nyog yuav tsum tau ua kom qis qis qis ntawm cov yaj thiab txo cov pwm puv siab, thiab tswj cov kev paub txog kev tuav lub siab (secondary pressure, follow-up pressure) kom cov yaj ntxiv lub shrinkage ntawm cov yaj. mus rau hauv pwm kab noj hniav ua ntej lub rooj vag solidifies, uas tso rau pem hauv ntej cov kev cai ntawm ntau theem txhaj ceev thiab siab rau cov txheej txheem txhaj tshuaj.
Kev daws rau warpage thiab deformation ntawm cov khoom tshwm sim los ntawm residual thermal stress:
Qhov nrawm ntawm cov dej saum npoo yuav tsum tsis tu ncua.Kev txhaj tshuaj nrawm nrawm yuav tsum tau txais yuav los tiv thaiv cov yaj los ntawm khov thaum lub sijhawm txhaj tshuaj.Kev teeb tsa ntawm cov kua nplaum nrawm yuav tsum tau coj mus rau hauv tus account kom nrawm nrawm rau hauv qhov chaw tseem ceeb (xws li ntws channel) thiab qeeb ntawm cov dej nkag.Cov kua nplaum txhaj tshuaj ceev yuav tsum xyuas kom meej tias nws nres tam sim ntawd tom qab cov pwm kab noj hniav tau sau los tiv thaiv overfilling, flash thiab residual stress.
Post lub sij hawm: May-17-2022