SMC / BMC molding txheej txheem

SMC pwm

SMC yog daim ntawv molding compound.

Cov ntaub ntawv tseem ceeb ntawm SMC yog tsim los ntawm GF (cov xov paj tshwj xeeb), UP (unsaturated resin), qis shrinkage additives, MD (filler) thiab ntau yam auxiliaries.

SMC muaj qhov zoo ntawm superior corrosion kuj, softness, yooj yim engineering tsim, thiab yooj. Nws cov khoom siv kho tshuab yog piv rau qee cov ntaub ntawv hlau. Cov khoom uas nws manufactures muaj qhov zoo ntawm rigidity zoo, deformation kuj, thiab dav kev khiav hauj lwm kub ntau yam.

Nyob rau tib lub sijhawm, qhov loj ntawm SMC cov khoom tsis yooj yim deformed thiab muaj cov cua sov zoo heev; nws tuaj yeem tswj hwm nws qhov kev ua tau zoo hauv qhov chaw txias thiab kub, thiab tsim nyog rau sab nraum zoov UV tiv thaiv thiab dej tsis zoo.

Kev siv dav dav, xws li tsheb pem hauv ntej thiab nram qab bumpers, rooj zaum, qhov rooj vaj huam sib luag, khoom siv hluav taws xob, dab da dej, thiab lwm yam.

BMC pwm

BMC yog cov ntawv luv ntawm (Bulk Molding Compounds), uas yog bulk molding compound.

BMC yog cov yas thermosetting uas sib xyaw nrog ntau yam inert fillers, fiber ntau reinforcements, catalysts, stabilizers thiab pigments los tsim cov nplaum "putty-like" composite khoom rau compression molding lossis txhaj tshuaj molding. Nws feem ntau yog ua los ntawm extrusion. Puab rau hauv granules, cav los yog strips los pab txhawb kev ua tom qab thiab shaping.

BMC muaj ntau yam khoom tshwj xeeb, xws li siab hardness, lub teeb yuag, corrosion kuj, UV tsis kam, rwb thaiv tsev zoo, thiab zoo thermal zog, uas ua rau BMC xav tau ntau tshaj li thermoplastics. Nyob rau tib lub sijhawm, vim tias muaj ntau yam khoom tuaj yeem raug molded tib lub sijhawm raws li cov khoom no, tsis tas yuav tsum tau ua tom qab ua tiav, uas yog kev lag luam ntau dua los ntawm kev xav ntau lawm.

Tam sim no, BMC pwm tau siv rau hauv tsheb, lub zog, cov khoom siv hluav taws xob, cov kev pabcuam catering, cov khoom siv hauv tsev, cov khoom siv kho qhov muag, cov khoom siv hauv kev lag luam thiab kev tsim kho thiab lwm qhov chaw. Xws li lub tsheb lub teeb npog, lub thawv hluav taws xob, lub thawv ntsuas, thiab lwm yam.

1. Kev npaj ua ntej kev tawm tsam

(1) Kev soj ntsuam zoo ntawm SMC / BMC: Qhov zoo ntawm cov ntawv SMC muaj kev cuam tshuam zoo rau cov txheej txheem molding thiab cov khoom zoo. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum nkag siab txog qhov zoo ntawm cov ntaub ntawv ua ntej nias, xws li cov khoom siv tshuaj pleev ib ce, cov ntaub ntawv tuab ntawm cov tshuaj pleev xim, cov iav fiber ntau cov ntsiab lus, thiab hom iav fiber ntau sizing tus neeg saib xyuas. Unit hnyav, zaj duab xis peelability, hardness thiab zoo uniformity, thiab lwm yam.

(2) Txiav: Txiav cov duab thiab qhov loj ntawm daim ntawv raws li cov qauv ntawm cov khoom, qhov chaw pub mis, thiab cov txheej txheem, ua cov qauv, thiab tom qab ntawd txiav cov khoom raws li cov qauv. Cov duab txiav feem ntau yog square lossis ncig, thiab qhov loj yog feem ntau 40% -80% ntawm thaj tsam ntawm qhov khoom. Txhawm rau tiv thaiv kev kis kab mob los ntawm cov impurities sab nraud, cov yeeb yaj kiab sab saud thiab sab qis raug tshem tawm ua ntej thauj khoom.

Moulding txheej txheem flow chart

2. Kev npaj cov khoom siv

(1) Paub txog ntau yam kev ua haujlwm ntawm cov xovxwm, tshwj xeeb tshaj yog kho cov kev ua haujlwm siab, xovxwm kev khiav hauj lwm ceev thiab lub rooj sib luag.

(2) Cov pwm yuav tsum tau muab ntsia rau kab rov tav thiab xyuas kom meej tias qhov chaw teeb tsa nyob hauv nruab nrab ntawm lub rooj xovxwm. Ua ntej nias, pwm yuav tsum tau muab ntxuav kom huv si thiab siv tus neeg sawv cev tso tawm. Ua ntej ntxiv cov ntaub ntawv, so tus neeg sawv cev tso tawm tusyees nrog cov ntaub qhwv huv kom tsis txhob cuam tshuam rau qhov zoo ntawm cov khoom. Rau cov pwm tshiab, cov roj yuav tsum tau muab tshem tawm ua ntej siv.

3. Ntxiv cov khoom xyaw

(1) Kev txiav txim siab ntawm tus nqi pub mis: Tus nqi pub mis ntawm txhua yam khoom tuaj yeem suav tau raws li cov qauv hauv qab no thaum thawj nias:

Ntxiv tus nqi = cov khoom ntim × 1.8g / cm³

(2) Kev txiav txim siab ntawm qhov chaw pub mis: Qhov loj ntawm qhov chaw pub mis ncaj qha cuam tshuam rau qhov ntom ntawm cov khoom, qhov kev ncua deb ntawm cov khoom thiab qhov zoo ntawm cov khoom. Nws muaj feem xyuam rau cov yam ntxwv ntws thiab solidification ntawm SMC, cov khoom yuav tsum tau ua, pwm qauv, thiab lwm yam. Feem ntau, qhov chaw pub mis yog 40% mus rau 80%. Yog tias nws me dhau lawm, cov txheej txheem yuav ntev dhau lawm, uas yuav ua rau cov iav fiber ntau orientation, txo lub zog, nce waviness, thiab txawm tias tsis ua rau cov pwm kab noj hniav. Yog tias nws loj dhau, nws tsis haum rau kev tso pa tawm thiab tuaj yeem ua rau tawg yooj yim hauv cov khoom.

(3) Pub txoj hauj lwm thiab txoj kev: txoj hauj lwm pub thiab txoj kev ncaj qha cuam tshuam rau cov tsos, lub zog thiab kev taw qhia ntawm cov khoom. Feem ntau, qhov chaw pub khoom ntawm cov khoom yuav tsum nyob nruab nrab ntawm cov pwm kab noj hniav. Rau cov khoom asymmetrical thiab complex, txoj haujlwm pub mis yuav tsum xyuas kom meej tias cov khoom ntws mus txog txhua qhov kawg ntawm cov pwm tsim kab noj hniav tib lub sijhawm thaum molding. Txoj kev pub mis yuav tsum yog qhov tsim nyog rau kev tso pa tawm. Thaum stacking ntau txheej ntawm cov nplooj ntawv, nws yog qhov zoo tshaj plaws los muab cov khoom siv rau hauv ib lub paj zoo nkauj nrog rau sab saum toj thiab loj hauv qab. Tsis tas li ntawd, sim tsis txhob ntxiv cov khoom thaiv cov khoom sib cais, txwv tsis pub huab cua nkag thiab vuam chaw yuav tshwm sim, uas ua rau txo qis ntawm lub zog ntawm cov khoom.

(4) Lwm tus: Ua ntej muab cov ntaub ntawv ntxiv, txhawm rau txhawm rau ua kom cov ntaub ntawv fluidity, preheating ntawm 100 ° C lossis 120 ° C tuaj yeem siv. Qhov no tshwj xeeb tshaj yog muaj txiaj ntsig zoo rau kev tsim cov khoom sib sib zog nqus.

4. Kev tsim

Thaum cov khoom thaiv nkag mus rau hauv pwm kab noj hniav, cov xovxwm txav mus sai sai. Thaum cov pwm sab sauv thiab sab qis sib phim, qhov xav tau molding siab maj mam siv. Tom qab ib qho kev kho qhov system, molding ntawm cov khoom tiav. Thaum lub sij hawm molding txheej txheem, ntau yam txheej txheem molding tsis thiab xovxwm kev khiav hauj lwm tej yam kev mob yuav tsum raug xaiv tsim nyog.

(1) Moulding kub: molding kub nyob ntawm qhov kev kho ntawm cov khoom siv tshuaj, cov khoom tuab, kev tsim khoom thiab qhov nyuaj ntawm cov khoom tsim. Lub molding kub yuav tsum xyuas kom meej tias cov txheej txheem kho yog pib, cov tshuaj tiv thaiv kev sib txuas ua haujlwm zoo, thiab ua tiav kev kho tiav. Feem ntau hais lus, molding kub xaiv rau cov khoom thicker yuav tsum qis dua cov khoom uas nyias-walled. Qhov no tuaj yeem tiv thaiv kom tsis txhob muaj cua sov ntau dhau hauv cov khoom tuab vim yog kub dhau. Yog hais tias lub thickness ntawm cov khoom yog 25 ~ 32 hli, molding kub yog 135 ~ 145 ℃; Thaum cov khoom thinner tuaj yeem ua pwm ntawm 171 ℃. Raws li lub molding kub nce, lub sij hawm curing sib raug yuav luv luv; conversely, thaum lub molding kub txo, cov coj curing lub sij hawm yuav tsum tau ncua. Qhov kub molding yuav tsum raug xaiv raws li kev lag luam tawm ntawm qhov siab tshaj plaws curing ceev thiab pom zoo molding tej yam kev mob. Nws feem ntau ntseeg tias SMC molding kub yog nyob nruab nrab ntawm 120 thiab 155 ° C.

(2) Moulding siab: SMC / BMC molding siab txawv nrog cov qauv khoom, cov duab, qhov loj thiab SMC thickening degree. Cov khoom uas muaj cov duab yooj yim tsuas yog yuav tsum muaj lub siab molding ntawm 5-7MPa; cov khoom uas muaj cov duab complex xav tau molding siab txog li 7-15MPa. Qhov siab dua qhov thickening degree ntawm SMC, ntau dua qhov yuav tsum tau molding siab. Qhov loj ntawm molding siab kuj muaj feem xyuam rau cov qauv pwm. Lub siab molding xav tau rau ntsug parting qauv pwm yog qis dua li ntawm kab rov tav parting qauv pwm. Moulds nrog me clearances yuav tsum tau siab dua pwm nrog clearances loj. Cov khoom lag luam nrog cov kev xav tau siab ntawm kev ua haujlwm zoo thiab smoothness yuav tsum tau siab dua molding thaum lub sij hawm molding. Hauv luv luv, ntau yam yuav tsum tau xav txog thaum txiav txim siab molding siab. Feem ntau hais lus, SMC molding siab yog nyob nruab nrab ntawm 3-7MPa.

(3) Lub sij hawm kho: Lub sij hawm kho ntawm SMC / BMC ntawm molding kub (tseem hu ua lub sij hawm tuav) muaj feem xyuam rau nws cov khoom, curing system, molding kub, khoom thickness thiab xim thiab lwm yam. Lub sijhawm kho yog feem ntau xam raws li 40s / mm. Rau cov khoom tuab dua 3 hli, qee cov neeg xav tias txhua 4 hli nce, lub sijhawm kho yuav nce 1 feeb.

5. Moulding ntau lawm txheej txheem tswj

(1) Cov txheej txheem tswj

Lub viscosity (kev sib raug zoo) ntawm SMC yuav tsum nyob twj ywm zoo ib yam thaum nias; Tom qab tshem tawm cov cab cab zaj duab xis ntawm SMC, nws tsis tuaj yeem tawm mus ntev. Nws yuav tsum tau nias tam sim ntawd tom qab tshem tawm cov zaj duab xis thiab yuav tsum tsis txhob raug rau saum huab cua kom tsis txhob overvolatilization ntawm styrene; khaws SMC Qhov kev pub mis thiab txoj haujlwm pub mis ntawm daim ntawv hauv pwm yuav tsum zoo ib yam; khaws qhov kub ntawm pwm ntawm cov haujlwm sib txawv thiab tsis tu ncua, thiab yuav tsum tau kuaj xyuas tsis tu ncua. Khaws lub molding kub thiab molding siab tas li thaum lub sij hawm molding txheej txheem thiab xyuas lawv tsis tu ncua.

(2) Cov khoom kuaj

Cov khoom yuav tsum raug kuaj rau cov nram qab no:

Kev tshuaj xyuas qhov tshwm sim: xws li glossiness, flatness, me ntsis, xim, ntws kab, tawg, thiab lwm yam.;

Kev ntsuas cov cuab yeej cuab tam: khoov lub zog, tensile lub zog, elastic modulus, thiab lwm yam., tag nrho cov khoom ua tau zoo kuaj; Lwm yam khoom: hluav taws xob tsis kam, media corrosion kuj.