SMC/BMC gyare-gyaren tsari

Farashin SMC

SMC shine fili mai ƙera takarda.

Babban albarkatun kasa na SMC sun hada da GF (yarn na musamman), UP (resin unsaturated), ƙananan abubuwan haɓakawa, MD (filler) da wasu ƙarin taimako.

SMC yana da fa'idodin mafi girman juriya na lalata, laushi, ƙirar injiniya mai sauƙi, da sassauci. Kaddarorin injinsa sun yi daidai da wasu kayan ƙarfe. Samfuran da take kerawa suna da fa'idodin tsauri mai kyau, juriya na lalacewa, da kewayon zafin aiki mai faɗi.

A lokaci guda, girman samfuran SMC ba su da sauƙi da sauƙi kuma yana da kyakkyawan juriya na zafi; zai iya kula da aikinsa da kyau a cikin yanayin sanyi da zafi, kuma ya dace da tsayayyar UV na waje da ayyukan hana ruwa.

An yi amfani da shi sosai, irin su ƙorafin mota na gaba da na baya, kujeru, fafunan ƙofa, kayan lantarki, baho, da sauransu.

BMC m

BMC shine gajarta (Bulk Molding Compounds), wanda shine fili mai gyare-gyaren girma.

BMC robobi ne na thermosetting wanda aka haɗe da nau'ikan abubuwan da ba za a iya amfani da su ba, abubuwan ƙarfafa fiber, masu haɓakawa, masu daidaitawa da pigments don samar da wani abu mai haɗaɗɗiyar “putty-like” don gyare-gyaren matsawa ko gyare-gyaren allura. Sau da yawa ana yin shi ta hanyar extrusion. Siffata zuwa granules, gungumen azaba ko tube don sauƙaƙe sarrafawa da siffatawa na gaba.

BMC yana da kaddarori masu yawa na musamman, irin su babban taurin, nauyi mai sauƙi, juriya na lalata, juriya na UV, insulation mai kyau, da kyawawan kaddarorin thermal, waɗanda ke sa BMC ya fi kyawu fiye da thermoplastics. A lokaci guda kuma, tun da yawancin abubuwan da za a iya gyare-gyare a lokaci guda tare da waɗannan sassa, babu buƙatar bayan sarrafawa, wanda ya fi dacewa da tattalin arziki daga yanayin samarwa.

A halin yanzu, an yi amfani da ƙirar BMC a cikin motoci, makamashi, na'urorin lantarki, sabis na abinci, kayan aikin gida, kayan aikin gani, masana'antu da kayan gini da sauran wurare. Kamar murfin hasken wutsiya na mota, akwatunan lantarki, akwatunan mita, da sauransu.

1. Shiri kafin a danne

(1) Ingancin dubawa na SMC / BMC: Ingantattun zanen gadon SMC yana da babban tasiri akan tsarin gyare-gyare da ingancin samfur. Don haka ya zama dole a fahimci ingancin kayan kafin latsawa, kamar dabarar manna guduro, daɗaɗɗen lankwasa na manna guduro, abun ciki na fiber gilashi, da nau'in ma'aunin ma'aunin fiber gilashin. Nauyin raka'a, peelability na fim, taurin kai da daidaiton inganci, da sauransu.

(2) Yanke: Ƙayyade siffar da girman takardar bisa ga tsarin tsarin samfurin, matsayi na ciyarwa, da tsari, yin samfurin, sa'an nan kuma yanke kayan bisa ga samfurin. Siffar yankan galibi murabba'i ne ko madauwari, kuma girman yawanci shine 40% -80% na farfajiyar da aka yi hasashen samfurin. Don hana gurbatawa daga ƙazantar waje, ana cire fina-finai na sama da na ƙasa kafin lodawa.

ginshiƙi tsarin tafiyar da gyare-gyare

2. Shirye-shiryen kayan aiki

(1) Sanin sigogin aiki daban-daban na latsa, musamman daidaita matsi na aiki, latsa saurin aiki da daidaiton tebur.

(2) Dole ne a shigar da ƙirar a kwance kuma tabbatar da cewa wurin shigarwa yana tsakiyar teburin latsa. Kafin dannawa, dole ne a tsaftace tsaftar da kyau kuma a yi amfani da wakili na saki. Kafin ƙara kayan, shafa wakili na saki a ko'ina tare da gauze mai tsabta don kauce wa rinjayar bayyanar samfurin. Don sababbin ƙira, dole ne a cire mai kafin amfani.

3. Ƙara kayan aiki

(1) Ƙayyadaddun adadin ciyarwa: Ana iya ƙididdige adadin ciyarwar kowane samfurin bisa ga dabarar lokacin latsawa ta farko:

Ƙara adadin = girman samfurin × 1.8g/cm³

(2) Ƙaddamar da yankin ciyarwa: Girman wurin ciyarwa kai tsaye yana rinjayar girman samfurin, nisa mai nisa na kayan da ingancin samfurin. Yana da alaƙa da kwarara da haɓaka halaye na SMC, buƙatun aikin samfur, tsarin ƙira, da sauransu. Gabaɗaya, yankin ciyarwa shine 40% zuwa 80%. Idan ya yi ƙanƙara, tsarin zai yi tsayi da yawa, wanda zai haifar da daidaitawar fiber na gilashi, rage ƙarfin, ƙara haɓaka, har ma da kasa cika rami na mold. Idan ya yi girma da yawa, ba ya da amfani ga shaye-shaye kuma yana iya haifar da fasa a cikin samfurin cikin sauƙi.

(3) Matsayin ciyarwa da hanyar: Matsayin ciyarwa da hanyar kai tsaye suna shafar bayyanar, ƙarfi da jagorar samfurin. A al'ada, matsayin ciyarwa na kayan ya kamata ya kasance a tsakiyar rami na mold. Don samfuran asymmetrical da hadaddun samfuran, matsayin ciyarwa dole ne a tabbatar da cewa kwararar kayan ta kai duk ƙarshen ƙera ƙura a lokaci guda yayin gyare-gyare. Hanyar ciyarwa dole ne ta kasance mai dacewa don shayewa. A lokacin da ake tara yadudduka da yawa na zanen gado, yana da kyau a tara sassan kayan a cikin siffar pagoda tare da ƙaramin sama da babban ƙasa. Bugu da ƙari, gwada kada ku ƙara tubalan kayan daban daban, in ba haka ba za a sami tarkon iska da wuraren waldawa, wanda zai haifar da raguwar ƙarfin samfurin.

(4) Wasu: Kafin ƙara kayan, don ƙara yawan ruwa na takardar, ana iya amfani da preheating a 100 ° C ko 120 ° C. Wannan yana da amfani musamman don ƙirƙirar samfuran da aka zana mai zurfi.

4. Samuwar

Lokacin da toshe kayan ya shiga cikin kogon ƙira, latsa yana motsawa ƙasa da sauri. Lokacin da manyan gyare-gyare na sama da na ƙasa suka dace, ana amfani da matsa lamba da ake buƙata a hankali. Bayan wani tsarin warkewa, an gama gyare-gyaren samfurin. Yayin aiwatar da gyare-gyaren, nau'ikan tsarin gyare-gyare daban-daban da yanayin aiki dole ne a zaɓi su cikin hankali.

(1) Zazzabi na gyare-gyare: Zazzabi na gyare-gyaren ya dogara da tsarin warkarwa na manna guduro, kauri daga cikin samfurin, ingancin samarwa da kuma rikitarwa na tsarin samfurin. Zazzabi na gyare-gyare dole ne a tabbatar da cewa an ƙaddamar da tsarin warkewa, hanyar haɗin kai ta ci gaba da sauƙi, kuma an sami cikakkiyar warkewa. Gabaɗaya magana, zafin gyare-gyaren da aka zaɓa don samfura masu kauri yakamata ya zama ƙasa da na samfuran sirara mai bango. Wannan na iya hana yawan zafin rana a cikin samfura masu kauri saboda yawan zafin jiki. Idan kauri daga cikin samfurin ne 25 ~ 32mm, da gyare-gyaren zafin jiki ne 135 ~ 145 ℃; yayin da thinner kayayyakin za a iya gyare-gyare a 171 ℃. Yayin da zafin jiki na gyare-gyare ya karu, ana iya rage lokacin warkewa daidai; Sabanin haka, lokacin da zafin jiki na gyare-gyaren ya ragu, lokacin da ya dace yana buƙatar ƙarawa. Ya kamata a zaɓi zafin gyare-gyaren azaman ciniki tsakanin matsakaicin saurin warkewa da mafi kyawun yanayin gyare-gyare. An yi imani da cewa yawan zafin jiki na SMC yana tsakanin 120 zuwa 155 ° C.

(2) Matsakaicin gyare-gyare: SMC / BMC gyare-gyaren matsa lamba ya bambanta da tsarin samfurin, siffar, girman da digiri na SMC. Samfura tare da siffofi masu sauƙi kawai suna buƙatar matsa lamba na 5-7MPa; samfurori tare da hadaddun siffofi suna buƙatar matsa lamba na gyare-gyaren har zuwa 7-15MPa. Mafi girma matakin thickening na SMC, mafi girma da ake bukata matsa lamba. Girman matsa lamba na gyare-gyare kuma yana da alaƙa da tsarin ƙira. A gyare-gyaren matsa lamba da ake bukata domin a tsaye parting tsarin molds ne m fiye da na kwance parting molds. Samfuran da ke da ƙananan sharewa suna buƙatar matsi mafi girma fiye da gyaggyarawa tare da mafi girma sharewa. Kayayyakin da ke da manyan buƙatu akan aikin bayyanar da santsi suna buƙatar matsa lamba mafi girma yayin gyare-gyare. A takaice, ya kamata a yi la'akari da dalilai da yawa lokacin da aka ƙayyade matsa lamba. Gabaɗaya magana, ƙarfin gyare-gyaren SMC yana tsakanin 3-7MPa.

(3) Lokacin warkewa: Lokacin warkewar SMC/BMC a yanayin zafin jiki (wanda kuma ake kira lokacin riƙewa) yana da alaƙa da kaddarorin sa, tsarin warkewa, zafin gyare-gyare, kauri samfurin da launi da sauran abubuwan. Ana ƙididdige lokacin warkewa gabaɗaya azaman 40s/mm. Don samfuran da suka fi kauri fiye da 3mm, wasu suna tunanin cewa kowane haɓakar 4mm, lokacin warkewa zai ƙaru da minti 1.

5. Molding samar da sarrafa tsari

(1) Gudanar da tsari

Danko (daidaituwa) na SMC yakamata koyaushe ya kasance daidai lokacin latsawa; bayan cire fim ɗin mai ɗaukar hoto na SMC, ba za a iya barin shi na dogon lokaci ba. Ya kamata a danna shi nan da nan bayan cire fim din kuma kada a fallasa shi zuwa iska don hana wuce gona da iri na styrene; ci gaba da SMC Siffar ciyarwa da matsayi na ciyar da takardar a cikin ƙirar ya kamata ya kasance daidai; kiyaye zazzabi na mold a wurare daban-daban iri ɗaya kuma akai-akai, kuma yakamata a duba shi akai-akai. Ci gaba da gyare-gyaren zafin jiki da matsa lamba na gyare-gyare yayin aiwatar da gyare-gyaren kuma duba su akai-akai.

(2) Gwajin samfur

Ya kamata a gwada samfuran don abubuwa masu zuwa:

Duban bayyanar: kamar sheki, flatness, spots, launi, kwarara Lines, fasa, da dai sauransu;

Gwajin kaddarorin injina: ƙarfin lanƙwasa, ƙarfin ɗaure, maɗaukaki na roba, da dai sauransu, duk gwajin aikin samfur; sauran kaddarorin: juriya na lantarki, juriyar lalatawar watsa labarai.