Pwm kub yog hais txog qhov kub thiab txias ntawm cov pwm kab noj hniav uas tuaj rau hauv kev sib cuag nrog cov khoom hauv cov txheej txheem txhaj tshuaj molding. Vim tias nws cuam tshuam ncaj qha rau cov cua txias ntawm cov khoom hauv pwm kab noj hniav, uas muaj kev cuam tshuam zoo rau kev ua haujlwm sab hauv thiab cov tsos zoo ntawm cov khoom.
1. Cov nyhuv ntawm pwm kub ntawm cov khoom muag.
Kev kub siab tuaj yeem txhim kho cov dej ntws ntawm cov resin, uas feem ntau ua rau saum npoo ntawm cov khoom du thiab ci, tshwj xeeb tshaj yog txhawm rau txhim kho qhov zoo nkauj ntawm cov iav fiber reinforced resin khoom. Nyob rau tib lub sijhawm, nws kuj txhim kho lub zog thiab zoo li ntawm fusion kab.
Raws li rau qhov etched nto, yog tias pwm kub qis, nws yog ib qho nyuaj rau cov yaj kom sau cov hauv paus hniav ntawm qhov kev ntxhib los mos, uas ua rau cov khoom nto zoo li ci, thiab "hloov" tsis tuaj yeem ncav cuag qhov kev ntxhib los mos ntawm cov pwm. . Qhov zoo tshaj plaws etching nyhuv tuaj yeem tau los ntawm kev nce pwm kub thiab cov khoom kub.
2. Kev cuam tshuam rau kev ntxhov siab sab hauv ntawm cov khoom.
Qhov tsim ntawm kev tsim kev ntxhov siab sab hauv yog qhov tshwm sim los ntawm qhov sib txawv thermal shrinkage thaum txias. Thaum cov khoom tsim, nws cov cua txias txuas ntxiv maj mam los ntawm qhov chaw mus rau sab hauv, thiab qhov chaw ua ntej shrinks thiab hardens, thiab maj mam mus rau sab hauv. Hauv cov txheej txheem no, kev ntxhov siab sab hauv yog tsim los ntawm qhov sib txawv ntawm shrinkage ceev.
Thaum cov residual kev ntxhov siab nyob rau hauv cov yas yog siab tshaj qhov elastic txwv ntawm cov resin, los yog nyob rau hauv lub yaig ntawm ib tug tej yam tshuaj ib puag ncig, tej kab nrib pleb yuav tshwm sim nyob rau saum npoo ntawm cov yas. Txoj kev tshawb no ntawm PC thiab PMMA pob tshab cob qhia tau hais tias cov residual internal stress nyob rau hauv lub nto txheej yog compressed thiab lub puab txheej yog extensional.
Qhov saum npoo compressive kev ntxhov siab nyob ntawm nws qhov chaw txias txias, thiab cov pwm txias ua rau cov molten resin txias sai, uas ua rau cov khoom molded tsim ntau dua residual kev ntxhov siab.
Cov pwm kub yog qhov yooj yim tshaj plaws los tswj cov kev ntxhov siab sab hauv. Yog tias pwm kub hloov me ntsis, qhov seem sab hauv kev ntxhov siab yuav hloov tau zoo heev. Feem ntau hais lus, qhov txaus siab sab hauv ntawm txhua yam khoom thiab cov resin muaj nws qhov qis tshaj pwm kub txwv. Thaum tsim nyias-walled los yog ntev khiav deb, pwm kub yuav tsum siab tshaj qhov tsawg kawg nkaus ntawm molding.
3. Txhim kho cov khoom warping.
Yog tias qhov tsim ntawm lub tshuab cua txias ntawm pwm tsis tsim nyog lossis pwm kub tswj tsis tau zoo, thiab cov khoom yas tsis txias txaus, nws yuav ua rau cov khoom yas tsis zoo.
Rau kev tswj qhov kub thiab txias ntawm pwm, qhov kub sib txawv ntawm cov pwm zoo thiab cov pwm tsis zoo, pwm core thiab pwm phab ntsa, pwm phab ntsa thiab cov ntxig yuav tsum txiav txim siab raws li cov yam ntxwv ntawm cov khoom, thiaj li tswj tau qhov txias shrinkage tus nqi ntawm txhua feem ntawm molding. Tom qab demoulding, cov khoom yas zoo li khoov mus rau qhov kev taw qhia traction nrog qhov kub thiab txias, thiaj li ua rau qhov sib txawv ntawm qhov sib txawv thiab tsis txhob cuam tshuam cov khoom yas warping raws li txoj cai orientation. Rau cov khoom yas uas muaj qhov sib luag thiab cov qauv, cov pwm kub yuav tsum tau khaws cia raws li qhov xav tau, kom qhov txias ntawm txhua qhov ntawm cov yas yuav tsum sib npaug.
4. cuam tshuam rau molding shrinkage ntawm cov khoom.
Cov pwm tsis tshua muaj pwm ua kom cov molecular "kev taw qhia khov" thiab ua kom cov tuab ntawm cov txheej khov ntawm cov yaj hauv pwm kab noj hniav, thaum qhov pwm tsis tshua muaj qhov cuam tshuam qhov kev loj hlob ntawm crystallization, yog li txo cov molding shrinkage ntawm cov khoom. Ntawm qhov tsis sib xws, thaum pwm kub siab, cov yaj txias maj mam, lub sij hawm so yog ntev, qhov taw qhia theem qis, thiab nws muaj txiaj ntsig zoo rau crystallization, thiab qhov tseeb shrinkage ntawm cov khoom yog loj dua.
5. cuam tshuam qhov kub deformation ntawm cov khoom.
Tshwj xeeb tshaj yog rau crystalline plastics, yog tias cov khoom yog molded nyob rau hauv ib tug qis pwm kub, lub molecular orientation thiab crystallization yog instantly khov, thiab cov saw molecular yuav tsum reranged ib nrab thiab crystallized nyob rau hauv ib tug ntau dua kub ib puag ncig los yog lwm yam txheej txheem, uas ua rau cov khoom deform. ntawm lossis txawm tias qis dua qhov kub ntawm thermal deformation (HDT) ntawm cov khoom.
Txoj kev raug yog siv qhov pom zoo pwm kub nyob ze rau nws qhov kub ntawm crystallization kom cov khoom muaj crystallized nyob rau hauv lub molding theem thiab tsis txhob tom qab crystallization thiab post-shrinkage nyob rau hauv lub kub kub ib puag ncig.
Hauv ib lo lus, pwm kub yog ib qho ntawm cov kev tswj hwm yooj yim tshaj plaws hauv cov txheej txheem txhaj tshuaj molding, thiab nws tseem yog qhov tseem ceeb hauv kev tsim pwm.
Nws txoj kev cuam tshuam ntawm kev tsim, kev ua haujlwm theem nrab thiab kev siv zaum kawg ntawm cov khoom tsis tuaj yeem kwv yees.
Post lub sij hawm: 23-12-22