1. Residual stress siab dhau lawm
Hauv cov txheej txheem kev ua haujlwm, nws yog txoj hauv kev yooj yim tshaj plaws los txo cov kev ntxhov siab seem los ntawm kev txo qhov kev txhaj tshuaj, vim tias qhov kev txhaj tshuaj siab yog proportional rau qhov seem seem.
Yog tias cov kab nrib pleb ntawm cov khoom yas yog xim dub nyob ib puag ncig, nws qhia tau hais tias qhov kev txhaj tshuaj siab dhau lawm lossis qhov pub mis tsawg dhau. Qhov kev txhaj tshuaj yuav tsum tau txo kom zoo los yog qhov pub mis ntau ntxiv. Thaum tsim nyob rau hauv cov khoom uas tsis tshua muaj kub thiab pwm kub, thiaj li yuav ua rau cov kab noj hniav tag nrho, nws yog ib qho tsim nyog yuav tsum tau siv cov kev txhaj tshuaj siab dua, uas ua rau muaj kev ntxhov siab ntau ntxiv hauv cov khoom yas.
Txog rau qhov kawg no, qhov kub ntawm lub tog raj kheej thiab cov pwm yuav tsum tau nce kom zoo, qhov kub ntawm qhov sib txawv ntawm cov khoom molten thiab cov pwm yuav tsum tau txo, lub sij hawm txias thiab ceev ntawm pwm embryo yuav tsum tau tswj, thiaj li hais tias lub orientation ntawm lub pwm. molecular saw muaj lub sij hawm rov qab ntev dua.
Tsis tas li ntawd, nyob rau hauv lub ntsiab lus ntawm kev ua kom tsis txaus noj thiab tsis ua rau cov khoom yas shrinkage thiab sag, lub sij hawm tuav lub sij hawm yuav tsum tau shortened, vim hais tias lub siab tuav lub sij hawm ntev dhau lawm thiab nws yog ib qho yooj yim los tsim residual kev nyuaj siab ua rau tawg.
Hauv pwm tsim thiab tsim khoom, lub qhov rooj ncaj qha nrog qhov tsawg kawg nkaus poob siab thiab kev txhaj tshuaj siab tuaj yeem siv. Lub rooj vag pem hauv ntej tuaj yeem hloov pauv mus rau ntau lub koob taw tes rooj vag lossis sab rooj vag, thiab lub rooj vag txoj kab uas hla tuaj yeem raug txo. Thaum tsim lub rooj vag sab, lub rooj vag flange uas tuaj yeem tshem tawm qhov tawg tom qab tsim tuaj yeem siv tau.
2. Sab nraud quab yuam ua rau residual stress concentration
Ua ntej qhov kev tso tawm ntawm cov khoom yas, yog tias qhov chaw hla ntawm lub ejection mechanism me dhau los yog tus naj npawb ntawm ejection pas nrig tsis txaus, qhov chaw ntawm ejection pas nrig tsis tsim nyog los yog installation qaij, tsis zoo tshuav nyiaj li cas, kev tso tawm nqes hav ntawm lub pwm tsis txaus, ejection kuj loj dhau, yuav ua rau muaj kev ntxhov siab vim yog sab nraud quab yuam, kom cov khoom yas tawg thiab tawg.
Raws li ib txwm muaj, qhov tsis ua haujlwm zoo li no ib txwm tshwm sim nyob ib puag ncig ejector pas nrig. Tom qab zoo li no tsis ua hauj lwm, yuav tsum ua tib zoo xyuas thiab kho lub ejection ntaus ntawv. Lub ejector pas nrig yog teem rau ntawm ib feem ntawm lub demulding kuj, xws li protruding, reinforcing tuav, thiab lwm yam. Yog hais tias tus naj npawb ntawm jacking rods teem tsis tau nthuav dav vim qhov txwv jacking cheeb tsam, txoj kev siv ib cheeb tsam me me thiab ntau jacking rods. tuaj yeem txais yuav.
3. Hlau inserts ua rau tawg
Lub thermal expansion coefficient ntawm thermoplastic yog 9 ~ 11 npaug loj dua li ntawm cov hlau thiab 6 npaug loj dua li ntawm txhuas. Yog li ntawd, cov hlau ntxig rau hauv cov khoom yas yuav cuam tshuam qhov kev poob qis ntawm cov khoom yas, uas ua rau muaj kev ntxhov siab loj, thiab ntau qhov kev ntxhov siab yuav sib sau ua ke nyob ib ncig ntawm cov khoom siv los ua kom tawg ntawm cov khoom yas. Nyob rau hauv txoj kev no, cov hlau ntxig yuav tsum tau preheated, tshwj xeeb tshaj yog thaum cov kab nrib pleb ntawm qhov chaw ntawm cov yas tshwm sim thaum pib ntawm lub tshuab, feem ntau yog tshwm sim los ntawm qhov kub thiab txias ntawm cov inserts.
Hauv kev xaiv molding raw cov ntaub ntawv, yuav tsum tau siv siab molecular hnyav resin kom deb li deb tau, yog hais tias yuav tsum tau siv tsawg molecular hnyav molding raw cov ntaub ntawv, cov yas thickness nyob ib ncig ntawm lub insert yuav tsum tau tsim thicker, rau polyethylene, polycarbonate, polyamide, cellulose acetate yas, cov yas thickness nyob ib ncig ntawm lub insert yuav tsum sib npaug zos rau tsawg kawg yog ib nrab ntawm txoj kab uas hla ntawm lub insert; Rau polystyrene, hlau ntxig feem ntau tsis haum.
4. Kev xaiv tsis raug lossis impurity ntawm raw khoom
Qhov rhiab heev ntawm cov khoom siv sib txawv rau cov kev ntxhov siab residual yog txawv. Feem ntau, cov uas tsis yog-crystalline resin feem ntau ua rau tawg vim kev ntxhov siab ntau dua li crystalline resin. Rau cov khoom siv absorbent thiab cov resin tov nrog ntau cov khoom siv rov ua dua, vim tias cov khoom siv absorbent yuav decompose thiab embrittleness tom qab cua sov, me me residual kev nyuaj siab yuav ua rau brittle cracking, thiab cov resin nrog ntau dua recycled cov ntsiab lus muaj ntau impurities, siab volatile ntsiab lus, qis dua. cov khoom siv zog, thiab yooj yim los tsim kev ntxhov siab tawg. Kev xyaum qhia tau hais tias qhov qis viscosity xoob resin tsis yooj yim rau tawg, yog li hauv cov txheej txheem tsim khoom, yuav tsum tau ua ke nrog cov xwm txheej tshwj xeeb los xaiv cov khoom tsim nyog.
Nyob rau hauv cov txheej txheem ntawm kev ua haujlwm, tso tawm tus neeg sawv cev rau cov khoom molten kuj yog lub cev txawv teb chaws, xws li kev siv tshuaj tsis raug kuj yuav ua rau tawg, yuav tsum sim txo nws cov tshuaj.
Tsis tas li ntawd, thaum lub tshuab txhaj tshuaj yas yuav tsum tau hloov cov khoom siv raw vim ntau lawm, nws yuav tsum ntxuav cov khoom seem hauv lub hopper feeder thiab tshuab ziab khaub ncaws, thiab tshem tawm cov khoom seem hauv lub tog raj kheej.
5. Cov qauv tsim tsis zoo ntawm cov khoom yas
Lub kaum ntse ntse thiab qhov khoob hauv cov qauv ntawm cov khoom yas feem ntau yuav tsim kev ntxhov siab, ua rau cov kab nrib pleb thiab tawg ntawm qhov chaw ntawm cov khoom yas. Yog li ntawd, lub kaum sab nrauv thiab sab hauv lub kaum sab xis ntawm cov qauv yas yuav tsum tau ua los ntawm lub vojvoog siab tshaj plaws kom deb li deb tau. Cov txiaj ntsig kev sim qhia tau hais tias qhov sib piv ntawm lub vojvoog ntawm lub arc thiab phab ntsa thickness ntawm lub ces kaum yog 1: 1.7. Thaum tsim cov qauv ntawm cov khoom yas, cov khoom uas yuav tsum tau tsim rau hauv cov ces kaum ntse thiab cov npoo ntse yuav tsum tau ua rau hauv ib qho me me arc nrog lub voj voog me me ntawm 0.5 hli, uas tuaj yeem ua rau lub neej ntev.
6. Muaj ib qho tawg hauv pwm
Nyob rau hauv cov txheej txheem ntawm kev txhaj tshuaj molding, vim qhov kev txhaj tshuaj ntau dua ntawm cov pwm, qhov ntug ntawm cov kab noj hniav nrog lub kaum sab xis yuav ua rau qaug zog tawg, tshwj xeeb tshaj yog nyob ze ntawm lub qhov cua txias tshwj xeeb yog yooj yim los tsim cov kab nrib pleb. Thaum cov pwm nyob rau hauv kev sib cuag nrog lub nozzle, hauv qab ntawm pwm yog nyem. Yog tias qhov chaw tso lub nplhaib qhov ntawm cov pwm loj los yog cov phab ntsa hauv qab yog nyias, qhov saum npoo ntawm cov pwm kab noj hniav yuav ua rau qaug zog tawg.
Thaum cov kab nrib pleb nyob rau saum npoo ntawm cov pwm kab noj hniav yog xav txog ntawm qhov chaw ntawm cov yas, cov kab nrib pleb ntawm qhov chaw ntawm cov yas ib txwm tshwm sim tsis tu ncua nyob rau hauv tib txoj kev zoo tib yam. Thaum cov kab nrib pleb zoo li no tshwm sim, cov kab noj hniav sib thooj yuav tsum tau kuaj tam sim ntawd rau tib cov kab nrib pleb. Yog hais tias qhov tawg yog vim kev xav, cov pwm yuav tsum tau kho mechanically.
Post lub sij hawm: 18-11-22