Njira yopangira SMC/BMC

Chithunzi cha SMC

SMC ndi gulu lopangira mapepala.

Zopangira zazikulu za SMC zimapangidwa ndi GF (ulusi wapadera), UP (unsaturated resin), zowonjezera zocheperako, MD (filler) ndi othandizira osiyanasiyana.

SMC ili ndi zabwino zokana kuwononga dzimbiri, kufewa, kapangidwe kosavuta kaukadaulo, komanso kusinthasintha. Mawotchi ake amafanana ndi zitsulo zina. Zogulitsa zomwe amapanga zimakhala ndi zabwino zokhazikika bwino, kukana ma deformation, komanso kutentha kwanthawi zonse.

Nthawi yomweyo, kukula kwa zinthu za SMC sikupunduka mosavuta ndipo kumakhala ndi kukana kwambiri kutentha; imatha kusunga ntchito yake bwino m'malo ozizira komanso otentha, ndipo ndi yoyenera kukana kwa UV ndi ntchito zopanda madzi.

Amagwiritsidwa ntchito kwambiri, monga kutsogolo kwagalimoto ndi mabampu akumbuyo, mipando, mapanelo a zitseko, zida zamagetsi, mabafa, etc.

Mtengo wa BMC

BMC ndiye chidule cha (Bulk Molding Compounds), chomwe ndi chochulukira choumba.

BMC ndi pulasitiki ya thermosetting yomwe imasakanizidwa ndi ma inert fillers osiyanasiyana, zowonjezera ulusi, zothandizira, zolimbitsa thupi ndi ma pigment kuti apange zomatira "putty-ngati" zomangira zomangira kapena kuumba jekeseni. Nthawi zambiri amapangidwa ndi extrusion. Pangani ma granules, zipika kapena mizere kuti muthandizire kukonza ndikusintha.

BMC ili ndi zinthu zambiri zapadera, monga kuuma kwakukulu, kulemera kwapang'onopang'ono, kukana dzimbiri, kukana kwa UV, kutchinjiriza kwabwino, komanso kutentha kwambiri, zomwe zimapangitsa BMC kukhala yofunikira kuposa thermoplastics. Panthawi imodzimodziyo, popeza zigawo zambiri zimatha kupangidwa panthawi imodzimodzi ndi zigawozi, palibe chifukwa chokonzekera pambuyo, chomwe chimakhala chopanda ndalama zambiri kuchokera kuzinthu zopanga.

Pakalipano, nkhungu za BMC zakhala zikugwiritsidwa ntchito mu magalimoto, mphamvu, zipangizo zamagetsi, ntchito zodyera, zipangizo zapakhomo, zida za kuwala, mafakitale ndi zomangamanga ndi madera ena. Monga zophimba zamoto mchira, mabokosi amagetsi, mabokosi a mita, ndi zina.

1. Kukonzekera pamaso kuponderezedwa

(1) Kuyang'ana kwabwino kwa SMC / BMC: Ubwino wa mapepala a SMC umakhudza kwambiri njira yopangira komanso mtundu wazinthu. Chifukwa chake, ndikofunikira kumvetsetsa mtundu wa zidazo musanakanikize, monga fomula ya phala la utomoni, mapindikira opindika a phala la utomoni, zomwe zili mugalasi la fiber fiber, komanso mtundu wa magalasi opangira utomoni. Unit kulemera, filimu peelability, kuuma ndi khalidwe kufanana, etc.

(2) Kudula: Dziwani mawonekedwe ndi kukula kwa pepala molingana ndi mawonekedwe a mankhwala, malo odyetserako, ndi ndondomekoyi, pangani chitsanzo, ndiyeno kudula zinthuzo molingana ndi chitsanzo. Mawonekedwe odulira nthawi zambiri amakhala ozungulira kapena ozungulira, ndipo kukula kwake nthawi zambiri kumakhala 40% -80% ya malo omwe akuyembekezeka. Pofuna kupewa kuipitsidwa ndi zonyansa zakunja, mafilimu apamwamba ndi apansi amachotsedwa asanatengedwe.

Kuumba ndondomeko yoyenda tchati

2. Kukonzekera zipangizo

(1) Dziwani bwino magawo osiyanasiyana ogwiritsira ntchito atolankhani, makamaka sinthani kuthamanga kwa ntchito, kuthamanga kwa ntchito yosindikizira ndi kufanana kwa tebulo.

(2) Chikombolecho chiyenera kukhazikitsidwa mozungulira ndikuwonetsetsa kuti malo oyikapo ali pakatikati pa tebulo losindikizira. Musanayambe kukanikiza, nkhungu iyenera kutsukidwa bwino ndikuyika chotulutsa. Musanawonjezere zipangizo, pukutani chotulutsacho mofanana ndi yopyapyala kuti musasokoneze maonekedwe a mankhwala. Kwa nkhungu zatsopano, mafuta ayenera kuchotsedwa musanagwiritse ntchito.

3. Kuwonjezera zosakaniza

(1) Kutsimikiza kwa kuchuluka kwa chakudya: Kuchuluka kwa chakudya chamtundu uliwonse kumatha kuwerengedwa motsatira njira iyi pakukanikizira koyamba:

Kuchulukitsa = kuchuluka kwazinthu × 1.8g/cm³

(2) Kutsimikiza kwa malo odyetserako chakudya: Kukula kwa malo odyetserako kumakhudza mwachindunji kachulukidwe ka mankhwala, mtunda wothamanga wa zinthu ndi khalidwe lapamwamba la mankhwala. Zimakhudzana ndi kayendedwe ka kayendedwe ka SMC, zofunikira zogwirira ntchito, mawonekedwe a nkhungu, etc. Kawirikawiri, malo odyetserako ndi 40% mpaka 80%. Ngati ndi yaying'ono kwambiri, ndondomekoyi idzakhala yayitali kwambiri, yomwe idzatsogolera ku magalasi opangira galasi, kuchepetsa mphamvu, kuonjezera kuwala, komanso kulephera kudzaza nkhungu. Ngati ndi yayikulu kwambiri, siyenera kutulutsa mpweya ndipo imatha kuyambitsa ming'alu ya chinthucho.

(3) Malo odyetserako ndi njira: Malo odyetserako ndi njira zimakhudza mwachindunji maonekedwe, mphamvu ndi njira ya mankhwala. Kawirikawiri, malo odyetsera zinthu ayenera kukhala pakati pa nkhungu. Kwa mankhwala asymmetrical ndi ovuta, malo odyetserako ayenera kuonetsetsa kuti kutuluka kwa zinthu kumafika malekezero onse a nkhungu kupanga patsekeke nthawi imodzi pa akamaumba. Njira yodyetsera iyenera kukhala yothandiza kuti itope. Mukayika mapepala angapo, ndi bwino kuyika zidutswazo mu mawonekedwe a pagoda ndi pamwamba pang'ono ndi pansi. Kuphatikiza apo, yesetsani kuti musawonjezere midadada yazinthu padera, apo ayi kutsekeka kwa mpweya ndi malo owotcherera kudzachitika, zomwe zimapangitsa kuchepa kwa mphamvu ya chinthucho.

(4) Zina: Musanawonjezere zipangizo, kuti muwonjezere madzi a pepala, kutentha kwa 100 ° C kapena 120 ° C kungagwiritsidwe ntchito. Izi ndizopindulitsa makamaka popanga zinthu zozama kwambiri.

4. Kupanga

Pamene chipika chakuthupi chimalowa mu nkhungu, makina osindikizira amatsika mofulumira. Pamene nkhungu zapamwamba ndi zotsika zimagwirizana, kukakamiza kofunikira kumagwiritsidwa ntchito pang'onopang'ono. Pambuyo pa njira ina yochiritsa, kuumba kwa mankhwala kumatsirizidwa. Pa akamaumba ndondomeko zosiyanasiyana akamaumba magawo ndi atolankhani ntchito zinthu ayenera zomveka anasankha.

(1) Kutentha kwapang'onopang'ono: Kutentha kwapang'onopang'ono kumadalira njira yochiritsira ya phala la utomoni, makulidwe a chinthucho, kupanga bwino komanso zovuta zomwe zimapangidwa. Kutentha koumba kuyenera kuwonetsetsa kuti njira yochiritsira yayambika, njira yolumikizirana imayenda bwino, ndipo kuchiritsa kwathunthu kumatheka. Nthawi zambiri, kutentha kowumba komwe kumasankhidwa pazinthu zokhuthala kuyenera kukhala kotsika poyerekeza ndi zinthu zokhala ndi mipanda yopyapyala. Izi zitha kuteteza kutentha kwambiri mkati mwazinthu zokhuthala chifukwa cha kutentha kwambiri. Ngati makulidwe a mankhwala ndi 25 ~ 32mm, kutentha akamaumba ndi 135 ~ 145 ℃; pomwe zinthu zowonda zimatha kupangidwa ku 171 ℃. Pamene kutentha kwa nkhungu kumawonjezeka, nthawi yochiritsira yofananira ikhoza kufupikitsidwa; Mosiyana ndi zimenezi, pamene kutentha kwa nkhungu kumachepa, nthawi yochiritsira yofananayo iyenera kukulitsidwa. Kutentha kopangira kuyenera kusankhidwa ngati kusinthanitsa pakati pa liwiro lalikulu la kuchiritsa ndi momwe mungapangire bwino. Nthawi zambiri amakhulupirira kuti kutentha kwa SMC kuli pakati pa 120 ndi 155 ° C.

(2) Kuthamanga kwamapangidwe: Kuthamanga kwa SMC / BMC kumasiyanasiyana ndi kapangidwe kazinthu, mawonekedwe, kukula ndi digiri ya SMC thickening. Zogulitsa zokhala ndi mawonekedwe osavuta zimangofuna kukakamiza kwa 5-7MPa; Zopangira zokhala ndi mawonekedwe ovuta zimafunikira kukakamiza kowumba mpaka 7-15MPa. Kukwera kwa kuchuluka kwa kuchuluka kwa SMC, kumapangitsanso kukakamiza kofunikira. Kukula kwa kukakamiza kuumba kumagwirizananso ndi mawonekedwe a nkhungu. Kupanikizika kowumba komwe kumafunikira paziwumbo zogawika zotsatizana ndi zocheperako kuposa zopingasa zogawanika. Nkhungu zokhala ndi zilolezo zing'onozing'ono zimafuna kuthamanga kwambiri kuposa nkhungu zomwe zimakhala ndi zilolezo zazikulu. Zogulitsa zomwe zili ndi zofunika kwambiri pakuwoneka bwino komanso kusalala zimafunikira kukakamiza kowumba kwakanthawi pakuumba. Mwachidule, zinthu zambiri ziyenera kuganiziridwa pozindikira kukakamiza kowumba. Nthawi zambiri, kuthamanga kwa SMC kuli pakati pa 3-7MPa.

(3) Kuchiza nthawi: Nthawi yochiritsa ya SMC / BMC pa kutentha kwachitsulo (yomwe imatchedwanso nthawi yogwira) ikugwirizana ndi katundu wake, kuchiritsa dongosolo, kutentha kwa kutentha, makulidwe a mankhwala ndi mtundu ndi zina. Nthawi yochiritsa imawerengedwa kuti ndi 40s/mm. Pazinthu zazikulu kuposa 3mm, anthu ena amaganiza kuti pakuwonjezeka kulikonse kwa 4mm, nthawi yochiritsa imawonjezeka ndi mphindi imodzi.

5. Kuwongolera kupanga kupanga kupanga

(1) Kuwongolera njira

Kukhuthala (kusasinthika) kwa SMC kuyenera kukhala kosasintha nthawi zonse pakanikiza; mutachotsa filimu yonyamulira ya SMC, singasiyidwe kwa nthawi yayitali. Iyenera kupanikizidwa mwamsanga mutatha kuchotsa filimuyo ndipo sayenera kuwululidwa ndi mpweya kuti muteteze kuphulika kwakukulu kwa styrene; sungani SMC Maonekedwe odyetsera ndi malo odyetsera a pepala mu nkhungu ayenera kukhala ofanana; kusunga kutentha kwa nkhungu pa malo osiyana yunifolomu ndi mosalekeza, ndipo ayenera kufufuzidwa nthawi zonse. Pitirizani kutentha akamaumba ndi akamaumba kuthamanga mosalekeza pa akamaumba ndondomeko ndi kuwafufuza nthawi zonse.

(2) Kuyesa kwazinthu

Zogulitsa ziyenera kuyesedwa pazinthu izi:

Kuyang'anira maonekedwe: monga glossiness, flatness, mawanga, mtundu, mizere yothamanga, ming'alu, etc.;

Kuyesa kwamakina: mphamvu yopindika, kulimba kwamphamvu, zotanuka modulus, ndi zina zambiri, kuyesa magwiridwe antchito azinthu zonse; zinthu zina: kukana magetsi, media corrosion resistance.