Ob -Shot Silicone Overmolding yog dab tsi?
Ob-shot silicone overmolding yog txheej txheem uas txhaj cov kua roj hmab silicone (LSR) ncaj qha mus rau hauv lub substrate rigid-feem ntau yog ib qho engineering thermoplastic lossis hlau ntxig- yog li ob qho khoom siv tshuaj lom neeg hauv ib lub voj voog ntau lawm. Qhov tshwm sim yog ib qho kev sib koom ua ke nrog cov txheej txheem nyuaj thiab cov mos mos, elastic silicone nto, ua tsis muaj kua nplaum lossis cov kauj ruam sib dhos.
Cov kab lus no yog rau cov kws tsim khoom lag luam, cov cuab yeej yuav khoom, thiab cov thawj coj saib xyuas kev txiav txim siab seb puas yog overmolding haum rau lawv qhov chaw - npog cov txheej txheem, kev sib koom ua ke chemistry, cov ntsiab lus tseem ceeb, cov cai tsim, thiab cov ntawv thov raug.
Ob -Kev Txhaum Txhaum Cai Ua Haujlwm Li Cas?
Lub hauv paus ntsiab lus tseem ceeb yog ua ntu zus molding nyob rau hauv ib lub voj voog tshuab. Ua ntej, cov txheej txheem nruj yog molded (los yog loaded ua ntej -moulded insert). Tom qab ntawd LSR raug txhaj rau thaj tsam ntawm lub substrate, thiab cov cua sov kho cov silicone thaum nws tsim ib daim ntawv cog lus ntawm lub interface.
Muaj ob txoj hauv kev ntau lawm:
Multi-shot (2K) molding:Ib lub teb los yog qhov ntsuas - phaj pwm pwm cov thermoplastic nyob rau hauv chaw nres tsheb ib, rotates, ces overmolds LSR nyob rau hauv chaw nres tsheb ob - tag nrho automated, siab tshaj tawm.
Insert overmolding:Ua ntej-moulded substrates yog muab tso (feem ntau yog neeg hlau) rau hauv LSR pwm, ces overmolded. Hloov tau yooj yim dua rau cov ntim qis thiab cov hlau ntxig.
Vim tias LSR yog lub ntsuas kub uas kho nrog cua sov thaum feem ntau cov thermoplastics soften nrog cua sov, ob cov ntaub ntawv zaum ntawm qhov kawg ntawm qhov ntsuas kub. Qhov no ua rau cov cuab yeej tsim thiab kev sib cais thermal ntawm sab yas thiab silicone sab hauv nruab nrab engineering kev sib tw.
Vim li cas thiaj xaiv Overmolding Hloov Kev Sib Tham?
Overmolding hloov cov kua nplaum, gaskets, thiab phau ntawv sib dhos nrog ib qho molded ib feem, uas txo tus nqi zog, tshem tawm qhov tsis ua haujlwm, thiab txhim kho kev sib khi. Ib qho kev sib txuas sib txuas nrog cov tshuaj tiv thaiv tev thiab dej nkag tau zoo dua li kev sib koom ua ke.
Cov txiaj ntsig tseem ceeb ntawm ib nrais muag:
Tsis muaj adhesives lossis primersthaum tus kheej- cov qhab nias LSR siv nrog cov substrates sib xws.
Tsawg dua cov kauj ruam sib dhosthiab qis dua rau ib feem - ua haujlwm.
Txhim khu kev sealingrau IP- ntsuas thiab cov khoom kho mob.
Zoo ergonomics-soft-kov nto molded raws nraim qhov xav tau.
Yam khoom twg Bond zoo hauv LSR Overmolding?
Tus kheej- kev sib txuas (tus kheej- nplaum) LSR qib kev cog lus ntseeg siab rau siab -kub engineering yas; low-kub khoom yas yog qhov nyuaj rau kev sib cog lus. Kev xaiv substrate yog ib qho kev tsav tsheb loj tshaj plaws ntawm daim ntawv cog lus.
|
Substrate |
Bonding nrog tus kheej - nplaum LSR |
Sau ntawv |
|
PA (nylon), PBT |
Zoo heev |
Common rau connectors, vaj tse |
|
PC, PC / ABS |
Zoo |
Siv dav; txheeb xyuas qib compatibility |
|
PEB, PSU, PSU |
Zoo heev |
Siab -temp, kev kho mob- qib muaj peev xwm |
|
PE, PE |
Tsis zoo / xav tau kev kho mob |
Tsawg zog nto; feem ntau xav tau plasma lossis primer |
|
Hlau (Al, stainless) |
Zoo nrog primer |
Siv rau kev kho mob thiab cov ntsaws ruaj ruaj |
Rau qhov tsis yog - kev sib txuas ua ke, kev sib txuas ntawm cov khoom siv sib txuas (undercuts, los ntawm - qhov, zawj) cia cov silicone kho tau tuav lub substrate lub cev txawm tias tsis muaj tshuaj lom neeg.
Cov txheej txheem dab tsi tseem ceeb tshaj plaws?
Overmolding zoo nyob ntawm nruj tswj kub, txhaj tshuaj, thiab kho qhov chaw. Cov qhov rais kev khiav hauj lwm zoo rau LSR overmolding yog qhia hauv qab no - qhov tseem ceeb yog nyob ntawm cov khoom, ib feem geometry, thiab tshuab.
|
Parameter |
Yam ntau yam |
Vim li cas thiaj tseem ceeb |
|
LSR pwm kub |
150-200 degree |
Tsav kho ceev thiab kev sib koom ua ke |
|
Substrate ua ntej - cua sov |
40-120 degree |
Txo thermal shock, pab kev sib raug zoo |
|
Kev txhaj tshuaj (metering) piv |
1:1 (A:B) |
Xyuas kom tag nrho, uniform crosslinking |
|
Kho lub sij hawm |
20–60 s (section-nyob ntawm) |
Hauv qab - kho kom tsis muaj zog ntawm daim ntawv cog lus |
|
Lub sijhawm voj voog |
30-90 s typical |
Nyob ntawm phab ntsa thickness thiab cavitation |
|
Cov khoom siv khib nyiab (txias khiav) |
Zero |
LSR tsis kho nyob rau hauv ib tug txias khiav |
Lub tshuab txias - khiav yog tus qauv rau kev tsim tawm ntau dhau vim tias nws ua rau LSR tsis kho nyob rau hauv tus khiav, tshem tawm cov khoom seem thiab txiav cov nqi ntawm txhua qhov kev txhaj tshuaj.
Dab tsi yog Cov Cai Tsim Qauv Tseem Ceeb rau Overmolded Parts?
Tsim rau overmolding los ntawm kev tswj cov phab ntsa thickness, daim ntawv cog lus cheeb tsam, thiab venting. Feem ntau qhov tsis xws luag-delamination, flash, thiab cua ntxiab- taug qab rov qab rau cov kev txiav txim siab geometry ua ntej lub cuab yeej txiav.
Cov txheej txheem siv tau suav nrog: khaws cov phab ntsa silicone kom zoo ib yam (kwv yees li 0.5-3 hli) kom kho qhov sib npaug; muab qhov dav dav, huv si ntawm daim ntawv cog lus es tsis yog cov npoo nyias uas tev; ntxiv qhov cua zoo vim LSR ntxiab cua nkag tau yooj yim; thiab tsim lub substrate kom zam 150-200℃pwm kub yam tsis muaj kev cuam tshuam.
Qhov twg yog ob-Tshuaj Silicone Overmolding siv?
Overmolding yog tus qauv nyob qhov twg qhov chaw nruj xav tau qhov muag muag, kaw, lossis daim tawv nqaij -hu rau saum npoo. High- thaj chaw thov ntim suav nrog:
Kev kho mob:li qub, cov ntsaws ruaj ruaj, cov khoom siv hluav taws xob hnav, thiab tuav siv biocompatible LSR (ISO 10993 / USP Class VI).
Automotive:connector seals, daim nyias nyias, thiab hloov npog ntsuas ntsuas kub thiab IP sealing.
Consumer &wearables:saib lub cev, cov lus qhia ntawm lub mloog pob ntseg, cov nyees khawm, thiab mos- kov cov ntaub ntawv.
Cov khoom me me & menyuam yaus:soothers thiab pub cov khoom sib txuas ua ke nrog cov khoom noj khoom haus -hu rau silicone.
fAQs
Dab tsi yog qhov txawv ntawm ob - txhaj tshuaj molding thiab overmolding?
Ob -shot (2K) molding ua rau ob qho khoom siv hauv ib qho ntau- chaw nres tsheb pwm hauv ib lub voj voog uas tsis siv neeg. Overmolding yog lub ntsiab lus dav dav rau molding ib qho khoom mus rau lwm qhov thiab suav nrog kev ntxig overmolding, qhov twg pre-molded substrate yog loaded rau hauv LSR cuab yeej. Ob - txhaj tshuaj yog ib daim ntawv ua tiav ntawm kev siv ntau dhau rau cov ntim siab.
Puas yog LSR daim ntawv cog lus rau cov yas tsis muaj nplaum?
Tau-tus kheej- kev sib txuas LSR qib tsim cov tshuaj tiv thaiv ncaj qha rau kev sib tw siab - cov yas kub xws li PA, PBT, PC, thiab PEI yam tsis muaj primer. Tsawg-nto- cov khoom siv hluav taws xob xws li PP thiab PE feem ntau xav tau kev kho ntshav plasma, primer, lossis cov khoom siv sib txuas los tuav cov silicone ntseeg tau.
Dab tsi ua rau delamination nyob rau hauv overmolded silicone qhov chaw?
Kev delamination feem ntau yog los ntawm qhov tsis sib xws hauv substrate, cov kab mob sib kis los yog qhov chaw sib txuas txias, kev kho tsis tiav, lossis thaj chaw sib cog lus tsawg dhau. Kev txheeb xyuas cov substrate-rau-LSR compatibility, tswj pwm thiab substrate kub, xyuas kom meej tag nrho cov kev kho mob, thiab tsim kom muaj kev sib raug zoo nto yog lub ntsiab tiv thaiv cov kauj ruam.
Puas yog ob- txhaj tshuaj silicone overmolding haum rau cov ntim tsawg?
Yog, los ntawm insert overmolding. Ntau dua li cov cuab yeej siv 2K kim, ua ntej- pwm substrates tau thauj khoom- manually lossis los ntawm neeg hlau- rau hauv ib qho - chaw nres tsheb LSR pwm. Qhov no txo qis cov cuab yeej peev rau cov qauv thiab qis - mus rau - nruab nrab ntim thaum khaws cov sib koom ua ke - qhov zoo.
Kuv yuav xaiv li cas ntawm mechanical interlock thiab chemical bonding?
Siv cov tshuaj sib xyaw ua ke thaum lub substrate yog qhov sib txuam siab -temp yas thiab koj xav tau lub kaw lus, tev- tiv taus interface. Siv cov cuab yeej sib cuam tshuam thaum lub substrate tsis tuaj yeem sib txuas cov tshuaj (xws li PP, PE, lossis qee yam hlau) lossis thaum koj xav tau kev ruaj ntseg ntxiv hauv siab - cov ntawv thov kev ntxhov siab. Ntau qhov chaw ua ke ob qho tib si.