Iyo crystalline yakanyungudika nzvimbo yePTFE i327 ℃, asi resin inofanira kunge iri pamusoro pe380 ℃ kuti ive muvhu rakanyungudutswa.Pamusoro pezvo, PTFE ine yakanyanya kusimba yekunyungudutsa.Naizvozvo, haigone kushandisa chero kunyungudika kana kunyungudika kugadzirisa.Kazhinji, kugadzirwa kwezvigadzirwa zvayo kunogona kungoitwa sesimbi uye ceramic processing.Iyo poda inotanga kuumbwa, uye yozoitwa sinter uye kugadziridzwa, kana kuumbwa neextrusion, Isobaric kuumba, kupfekedza kuumba, uye calendering kugadzira.
Iyo crystalline yakanyungudika nzvimbo yePTFE i327 ℃, asi resin inofanira kunge iri pamusoro pe380 ℃ kuti ive muvhu rakanyungudutswa.Pamusoro pezvo, PTFE ine yakanyanya kusimba yekunyungudutsa.Naizvozvo, haigone kushandisa chero kunyungudika kana kunyungudika kugadzirisa.Kazhinji, kugadzirwa kwezvigadzirwa zvayo kunogona kungoitwa sesimbi uye ceramic processing.Iyo poda inotanga kuumbwa, uye yozoitwa sinter uye kugadziridzwa, kana kuumbwa neextrusion, Isobaric kuumba, kupfekedza kuumba, uye calendering kugadzira.
Compression Molding
Compression molding ndiyo yakanyanyaPTFE kuumba kugadzirisanzira inoshandiswa ikozvino yePTFE.Nzira yekuumba inzira iyo zvimwe zvinhu zvekuumba (upfu, pellets, fibrous materials, nezvimwewo) zvinoiswa musimbi mold uye inoumbwa pane imwe tembiricha uye kumanikidzwa.Iyo polymer yakagadziriswa nekumanikidza kuumbwa haina kuganhurirwa nehuremu hwayo hwemamorekuru, uye anenge ese mapurasitiki anogona kugadziriswa nekumanikidza kuumbwa.Hunhu hukuru hwekumanikidza kuumbwa ndeiyi: mutengo wakaderera, midziyo yakapusa, yakaderera mari, uye isina kuganhurirwa nehuremu hwemamorekuru epurasitiki yakagadziriswa;izvo zvisingabatsiri ndezvakaderera kugadzirwa kwakanaka, kukwirira kwevashandi, uye kusagadzikana kwemhando yechigadzirwa.Huremu hwemamorekuru hwePTFE hwakanyanya kukwirira uye kuyerera kwakashata zvakanyanya.Kana dzimwe nzira dzekugadzirisa dzisati dzakura, nyika dzepasirese dzinonyanya kushandisa compression molding kugadzirisa zvigadzirwa zvePTFE.
Iyo chaiyo maitiro ekumanikidza kuumbwa yakakamurwa kuita ① press-sinter-press nzira;② sinter-press nzira;③ nekukurumidza kupisa-press nzira;④ dzvanya uye sinter panguva imwe chete.
Hydroforming
Iyo hydraulic nzira inonzi zvakare yakaenzana nzira uye yakaenzana nzira yekumanikidza, iri yekuwedzera PTFE resin zvakaenzana pakati pebhegi rerabha nemadziro ekuumbwa, wobva wabaya mvura (mvura inowanzo shandiswa) mubhegi rerabha, uye bhegi rerabha rinogadzira. kudzvinyirira kunowedzera kumadziro ekuumbwa uye compacts Resin inova nzira ye preforms.Iyi nzira inogona kushandiswa kugadzira maoko akakura, matangi ekuchengetera pasi, hemispherical shells, tower columns, big slabs, etc., uye inogona kushandiswawo kugadzira ma tee, magokora, maprofiled materials, etc. ine integrally lined PTFE composite structure.Zvigadzirwa zvine maitiro akaoma.Kubatsira kukuru kwehydroforming ndiyo yakapusa chimiro chemidziyo uye mold.Pombi yemvura yakajairika inotsiva muchina wakakwira-tonnage.Chigadzirwa chacho chakamisikidzwa zvakafanana, chine density inowirirana, chinogona kugadzira zvikamu zvakakura, zvine maumbirwo akaomarara, uye akareruka lining zvimiro.
Push kugadzira
Kusundidzira kunonzi zvakarenamatidza extrusionkuumba.Iyo 20-30 mesh sieved dispersing resin inosanganiswa ne organic additives (toluene, petroleum ether, solvent mafuta, nezvimwewo, chikamu cheresin uremu i1/5) kugadzira paste.Pre-yakamisikidzwa kuita gobvu-yakakomberedzwa denderedzwa nyore isina chinhu, wobva waiisa mune yekutsikisa zvinhu, uye shandisa plunger kuigadzira ichidziya.Mushure mekuomeswa, inotungidzirwa patembiricha ye360 ~ 380C, uye mushure mekutonhora, yakaoma push chubhu, tsvimbo, uye zvimwe zvigadzirwa zvinowanikwa.Zvigadzirwa zvepush zvinongogumira kumatanda ane dhayamita ye16mm kana pasi uye mapaipi ane kukora kwemadziro kwe3mm kana pasi.
Spiral extrusion molding
Iyo screw extruder yePTFE poda yakasiyana neye extruder inoshandiswa kune mamwe thermoplastics.Iyo extrusion molding yeZengtong thermoplastics ndeyekusimudzira zvinhu nenzira yekutenderera kwe screw, uku uchitambawo basa rekumanikidza, kuveura, uye kusanganisa., Nyaya yacho inonyungudutswawo nekupisa kunogadzirwa nechisimba chakanyanyisa uye kunze kwekupisa kwezvinhu.Iyo screw ye PTFE screw extruder inongotora basa rekufambisa nekusundidzira, kuitira kuti zvinhu zvipfuure nemusoro we-single-screw extruder ine kaviri-shinda, yakaenzana gomo uye yakaenzana kudzika, uye yobva yapinda mufa yekunyudza, Kutonhora. uye kuumba pamwe nekumanikidzwa kunopiwa ne backpressure device kuti uwane chinangwa chinopfuurira.Paunenge uchigadzira PTFE neine screw extruder, matambudziko makuru anowanzo kusangana.Nemhaka yekuti friction coefficient yePTFE powder yakaderera zvikuru, inokonzera kutsvedza panguva yekudyisa, iyo inoderedza zvikuru kukwanisa kwekufambisa kwekona.Pamusoro pezvo, nekuda kwekukweshana uye chizvarwa chekupisa, hupfu hunogona kunamatira kune screw kana dhiramu, zvichiita kuti kudyisa kuome uye kusagadzikana.
Mumakore achangopfuura, mapatya screws akashandiswawo mukugadzirisa zvinhu zvemhando iyi yakakosha.Nheyo yayo yekudyisa yakasiyana neyeimwe-screw extruders.Iyo ine yakanaka yekufambisa mhedzisiro uye inogona kukunda kutsvedza kweUHMWPE hupfu muscuru.Kuvandudza zvakanyanya screw feeding capacity.Pakati pavo, iyo counter-inotenderera mapatya-screw extruder ine zvirinani kusanganisa uye homogenization mhedzisiro pane yakafanana-inotenderera mapatya-screw extruder, asi nekuda kweiyo yakakura kupatsanura simba, iyo yekuveura mhedzisiro pa screw gap yakakura, zvichiita kuti zvinhu zviwedzere kupisa. uye extrude.Huremu hwemamorekuru hwezvinhu zvinobuda hunogona kudzikiswa neinenge 40%.Kana chivanze chakaitwa chikuru uye screws asina kubatanidzwa, zvinhu zvinonamatira kune inopisa simbi.Zvisinei, kushandiswa kwe-co-rotating twin-screw extruders haina matambudziko ari pamusoro apa.Mhedzisiro yekuveura kwezvinhu zviri mu extruder idiki, uye kupisa kunodiwa kupurasitiki kunobva kune kunze kwekudziya sosi, saka inogona kudzorwa nemazvo kuitira kuti kupisa kwekupisa kwezvinhu panguva yekuwedzeredza kunogona kuderedzwa, uye panguva imwechete kuchengetedza Kuyerera kwezvinhu mumusoro wemuchina kwakajairika uye kwakagadzikana, uye dhizaini yechikamu chechikamu chemusoro wemuchina unofanirwa kuchinjirwa kuhuwandu hwezvinhu zvinofambiswa ne screw.Iyo yekutenderera siruuru haigone kukurumidza kana, kazhinji kutenderedza gumi paminiti.Kuti udzivise zvinhu zvakangoerekana zvanamatira kune simbi pamusoro, tembiricha yeextrusion inofanira kunyatsodzorwa.
Plunger extrusion molding
Plunger extrusion molding processing mapurasitiki inzira yekare mukugadzirwa kwepurasitiki.Kubva pakubuda kwezvinhu zvepurasitiki, vanhu vakatanga kushandisa nzira iyi kugadzira mapurasitiki.Kugadzira PTFE ine plunger extruder, resin yehuwandu inodzvanywa muforoma, iyo plunger inodzokororwa, uye inotsikirirwa kuita preform.Nenzira iyi, akawanda preforms anoumbwa mukufa.Nekuda kwekukakavadzana pakati pePTFE resin uye kupokana pakati pePTFE resin uye rusvingo rwekufa, kuramba kunogadzirwa.Panguva imwecheteyo, iyo vhoriyamu yekuwedzera ye preform kana sintered mufa zvakare inogadzira kuramba, zvekuti ive preform yechikamu chimwe.Sintering uye kutonhora pasi pekumanikidzwa kuumba inoenderera yese.Zvakanakira nzira iyi ndezvekuti: hapana kugera panguva yekuumbwa, huremu hwema molecular hunoderedzwa, mhando yechigadzirwa yakanaka, uye haina kuganhurirwa nehuremu hwemamorekuru, uye inogona kugadzira madhayamita akakura ne hupamhi hwehupamhi hwe500mm uye kukora kwemadziro kwe3mm chete.Pipe.Nekudaro, nekuda kwenzvimbo diki yekusangana pakati peiyo mbishi uye yekupisa chikamu panguva yekutumira maitiro, iyo yekupisa inoshanda yakaderera, iyo inomisa kukurumidza kweiyo extrusion.
Nguva yekutumira: Jun-14-2020