SMC/BMC molding process

SMC mold

SMC is sheet molding compound.

Iwo makuru ezvigadzirwa zveSMC anoumbwa neGF (yakakosha shinda), UP (unsaturated resin), yakaderera shrinkage additives, MD (filler) uye akasiyana anobatsira.

SMC ine zvakanakira zvemhando yepamusoro corrosion kuramba, kupfava, nyore engineering dhizaini, uye kuchinjika. Iyo mechanical properties inofananidzwa nezvimwe zvinhu zvesimbi. Zvigadzirwa zvainogadzira zvine zvakanakira kusimba kwakanaka, deformation kuramba, uye yakakura yekushanda tembiricha renji.

Panguva imwecheteyo, saizi yezvigadzirwa zveSMC haisi nyore kuremara uye ine yakanakisa kupisa kupisa; inogona kuchengetedza kushanda kwayo zvakanaka munzvimbo dzinotonhora uye dzinopisa, uye inokodzera kunze kweUV inopikisa uye mabasa asina mvura.

Inoshandiswa zvakanyanya, senge kumberi kwemota uye kumashure mabhampa, zvigaro, mapaneru emasuo, midziyo yemagetsi, mabhavhu, nezvimwe.

BMC mold

BMC ndiyo chidimbu che (Bulk Molding Compounds), inova yakawanda inoumba musanganiswa.

BMC ipurasitiki ye thermosetting iyo inosanganiswa neakawanda inert mafirita, fiber reinforcements, catalysts, stabilizers uye pigment kuti igadzire inonamira "putty-like" inoumbwa zvinhu zvekumanikidza kuumba kana jekiseni kuumba. Kazhinji inogadzirwa ne extrusion. Gadzira kuita magranules, matanda kana mitsetse kuti ifambise kunotevera kugadzirisa uye kuumbwa.

BMC ine zvinhu zvakawanda zvakasarudzika, senge kuomarara kwepamusoro, huremu huremu, corrosion resistance, UV resistance, good insulation, uye yakanakisa thermal properties, izvo zvinoita kuti BMC iwedzere kudiwa pane thermoplastics. Panguva imwecheteyo, sezvo zvikamu zvakawanda zvinogona kuumbwa panguva imwe chete nezvikamu izvi, hapana chikonzero chekugadzirisa-post-processing, iyo inowedzera hupfumi kubva pakuona kwekugadzira.

Parizvino, BMC mold dzave dzichishandiswa mumotokari, simba, midziyo yemagetsi, masevhisi ekubika, midziyo yemumba, optical chiridzwa zvinhu, maindasitiri uye zvekuvaka uye dzimwe nzvimbo. Zvakadai semotokari yemuswe mwenje inovhara, mabhokisi emagetsi, mabhokisi emamita, nezvimwe.

1. Kugadzirira kusati kwadzvinyirirwa

(1) Kuongororwa kwemhando yeSMC/BMC: Hunhu hweSMC mashiti hune simba guru pamaitiro ekuumba uye mhando yechigadzirwa. Naizvozvo, zvinodikanwa kuti unzwisise kunaka kwezvishandiso usati wadzvanya, senge resin paste formula, gobvu curve ye resin paste, iyo girazi fiber zvirimo, uye mhando yegirazi fiber sizing agent. Unit uremu, firimu peelability, kuoma uye kunaka kufanana, nezvimwe.

(2) Kucheka: Sarudza chimiro uye saizi yepepa zvinoenderana nechimiro chechimiro chechigadzirwa, nzvimbo yekudyisa, uye maitiro, ita sampuli, wozocheka zvinhu zvinoenderana nemuenzaniso. Chimiro chekucheka chakanyanya mativi kana denderedzwa, uye saizi inowanzoita 40% -80% yenzvimbo inofungidzirwa pamusoro pechigadzirwa. Kuti udzivise kusvibiswa kubva kune kunze kwekunze, mafirimu epamusoro nepamusoro anobviswa asati atakura.

Molding process flow chart

2. Kugadzirira kwemidziyo

(1) Iva neruzivo neakasiyana siyana ekushandisa maparamita emuchina, kunyanya gadzirisa kudzvanywa kwekushanda, kudzvanya kumhanya kwekushanda uye parallelism yetafura.

(2) Iyo mold inofanirwa kuiswa yakatwasuka uye ive nechokwadi chekuti nzvimbo yekuisa iri pakati petafura yekutsikisa. Usati wadzvanya, mold inofanira kunyatsocheneswa uye mumiriri wekuburitsa aiswa. Usati wawedzera zvinhu, pukuta mumiririri wekusunungura zvakaenzana negauze yakachena kuti urege kukanganisa kuonekwa kwechigadzirwa. Kune zviumbwa zvitsva, mafuta anofanira kubviswa asati ashandiswa.

3. Kuwedzera zvinhu

(1) Kutemerwa kwehuwandu hwekudyisa: Huwandu hwekudya hwechigadzirwa chimwe nechimwe hunogona kuverengerwa zvinoenderana neinotevera fomula panguva yekutanga kudzvanya:

Kuwedzera huwandu = chigadzirwa vhoriyamu × 1.8g/cm³

(2) Kutsunga kwenzvimbo yekudyisa: Saizi yenzvimbo yekudyisa inobata zvakananga kuwanda kwechigadzirwa, kuyerera kureba kwechinhu uye nepamusoro pemhando yechigadzirwa. Iyo ine hukama nekuyerera uye kusimba maitiro eSMC, chigadzirwa chekuita zvinodiwa, mold chimiro, nezvimwe. Kazhinji, nzvimbo yekudyisa ndeye 40% kusvika 80%. Kana iri diki zvakanyanya, maitiro acho achave akareba, izvo zvinozotungamira kune girazi fiber orientation, kuderedza simba, kuwedzera waviness, uye kunyange kutadza kuzadza mold cavity. Kana yakakura kwazvo, haikodzeri kupera uye inogona kukonzera kutsemuka muchigadzirwa.

(3) Kudyisa chinzvimbo uye nzira: Nzvimbo yekudyisa uye nzira inobata zvakananga kutaridzika, simba uye kutungamira kwechigadzirwa. Kazhinji, nzvimbo yekudyisa yezvinhu inofanira kunge iri pakati pegomba rekuumbwa. Kune asymmetrical uye yakaoma zvigadzirwa, nzvimbo yekudyisa inofanirwa kuve nechokwadi chekuti kuyerera kwezvinhu kunosvika kumigumo yese ye mold inoumba mhango panguva imwe chete panguva yekuumbwa. Nzira yekudyisa inofanira kunge yakanakira kupera simba. Paunenge uchirongedza akawanda akaturikidzana emapepa, zvakanakisa kurongedza zvidimbu zvezvinhu muchimiro chepagoda nediki kumusoro uye pasi hombe. Mukuwedzera, edza kusawedzera zvidhinha zvakaparadzana, zvikasadaro kupindira kwemhepo uye nzvimbo dzewelding zvichaitika, zvichikonzera kuderera kwesimba rechigadzirwa.

(4) Zvimwe: Usati wawedzera zvinhu, kuitira kuti uwedzere mvura yepepa, preheating pa 100 ° C kana 120 ° C inogona kushandiswa. Izvi zvinonyanya kubatsira pakugadzira yakadzika yakadhirowa zvigadzirwa.

4. Kuumba

Kana iyo block block ichipinda mugomba rekuumbwa, iyo press inodzika pasi nekukurumidza. Kana iyo yepamusoro uye yakaderera molds inofananidzwa, iyo inodiwa yekuumba inomanikidza inoiswa zvishoma nezvishoma. Mushure meimwe nzira yekurapa, kuumbwa kwechigadzirwa kunopedzwa. Munguva yekuumba maitiro, akasiyana-siyana ekuumba maparamita uye kudzvanya maitiro ekushanda anofanirwa kusarudzwa zvine musoro.

(1) Tembiricha yekuumbwa: Iyo tembiricha yekuumbwa inoenderana nekurapa sisitimu ye resin paste, ukobvu hwechigadzirwa, kugona kwekugadzira uye kuomarara kwechigadzirwa chimiro. Iyo tembiricha yekuumba inofanirwa kuve nechokwadi chekuti iyo yekurapa system yatangwa, iyo cross-linking reaction inofamba zvakanaka, uye kurapa kwakazara kunowanikwa. Kazhinji, tembiricha yekuumba inosarudzirwa zvigadzirwa zvakakora inofanira kunge yakadzikira pane yezvigadzirwa zvakatetepa-madziro. Izvi zvinogona kudzivirira kuwandisa kwekupisa mukati mezvigadzirwa zvakakora nekuda kwekupisa kwakanyanya. Kana ukobvu hwechigadzirwa huri 25 ~ 32mm, tembiricha yekuumba iri 135 ~ 145 ℃; nepo zvigadzirwa zvitete zvinogona kuumbwa pa171 ℃. Sezvo tembiricha yekuumba ichiwedzera, nguva yekurapa inoenderana inogona kupfupikiswa; ukuwo, kana tembiricha yekuumba inodzikira, nguva yekurapa inoenderana inoda kuwedzerwa. Iyo tembiricha yekuumba inofanirwa kusarudzwa sekutengeserana-kure pakati pehupamhi hwekurapa kumhanya uye yakakwana yekuumba mamiriro. Zvinowanzotendwa kuti tembiricha yekuumba SMC iri pakati pe120 ne155°C.

(2) Molding pressure: SMC/BMC molding pressure inosiyana nechimiro chechigadzirwa, chimiro, saizi uye SMC thickening degree. Zvigadzirwa zvine maumbirwo akareruka zvinongoda kuumbwa kwekumanikidza kwe5-7MPa; zvigadzirwa zvine maumbirwo akaomarara zvinoda kuumbwa kwekumanikidza kusvika ku7-15MPa. Iyo yakakwira iyo gobvu dhigirii reSMC, iyo yakakura iyo inodiwa yekuumbwa kumanikidza. Saizi yekumanikidza yekuumbwa inoenderanawo neiyo mold chimiro. Mushonga wekuumba unodiwa kune vertical parting structure moulds yakadzikira pane yehorizontal parting structure molds. Molds ine zvidiki clearances inoda kudzvanywa kwepamusoro pane molds ine ma clear clearances. Zvigadzirwa zvine zvakakwirira zvinodikanwa pakuita kwechitarisiko uye kutsvedzerera kunoda yakakwira yekuumbwa kumanikidza panguva yekuumbwa. Muchidimbu, zvinhu zvakawanda zvinofanirwa kutariswa pakusarudza kuumbwa kwekumanikidza. Kazhinji kutaura, iyo SMC yekuumba kumanikidza iri pakati pe3-7MPa.

(3) Kurapa nguva: Iyo nguva yekurapa yeSMC / BMC panguva yekuumba tembiricha (inonziwo nguva yekubata) ine hukama nehupfumi hwayo, kurapa system, tembiricha yekuumbwa, ukobvu hwechigadzirwa uye ruvara nezvimwe zvinhu. Nguva yekurapa inowanzoverengerwa se40s/mm. Kune zvigadzirwa zvakakora kupfuura 3mm, vamwe vanhu vanofunga kuti pakuwedzera kwe4mm, nguva yekurapa ichawedzera neminiti imwe.

5. Molding kugadzirwa muitiro kudzora

(1) Kudzora maitiro

Iyo viscosity (kuenderana) yeSMC inofanirwa kugara ichienderana panguva yekudzvanya; mushure mekubvisa mutakuri firimu we SMC, haigone kusiiwa kwenguva yakareba. Inofanira kudzvinyirirwa pakarepo mushure mokubvisa firimu uye haifaniri kuzarurirwa kumhepo kuti irege kudzivirira zvakanyanya volatilization ye styrene; chengeta SMC Chimiro chekudya uye nzvimbo yekudyisa yepepa mu mold inofanira kuenderana; chengetedza tembiricha ye mold panzvimbo dzakasiyana yunifomu uye nguva dzose, uye inofanira kuongororwa nguva dzose. Chengetedza tembiricha yekuumba uye kuumbwa kudzvinyirira nguva dzose panguva yekuumba uye tarisa ivo nguva dzose.

(2) Kuongororwa kwechigadzirwa

Zvigadzirwa zvinofanirwa kuyedzwa kune zvinotevera zvinhu:

Kuongororwa kwechitarisiko: sekupenya, flatness, mavara, ruvara, kuyerera mitsetse, kuputika, nezvimwewo;

Mechanical midziyo yekuyedza: kubhenda simba, kusimba simba, elastic modulus, nezvimwewo, yakazara chigadzirwa kuita bvunzo; zvimwe zvinhu: kupikisa magetsi, media corrosion resistance.