The crystalline narkewa batu na PTFE ne 327 ℃, amma guduro dole ne a sama 380 ℃ ya zama a cikin wani narkakkar jihar.Bugu da ƙari, PTFE yana da ƙarfin juriya mai ƙarfi.Don haka, ba za ta iya amfani da sarrafa narke ko sarrafa narke ba.Gabaɗaya, samar da samfuransa ba za a iya yin su kawai kamar ƙarfe da sarrafa yumbu ba.The foda ne da farko compacted, sa'an nan sintered da machined, ko kafa ta extrusion, Isobaric forming, shafi forming, da calendering forming.
The crystalline narkewa batu na PTFE ne 327 ℃, amma guduro dole ne a sama 380 ℃ ya zama a cikin wani narkakkar jihar.Bugu da ƙari, PTFE yana da ƙarfin juriya mai ƙarfi.Don haka, ba za ta iya amfani da sarrafa narke ko sarrafa narke ba.Gabaɗaya, samar da samfuransa ba za a iya yin su kawai kamar ƙarfe da sarrafa yumbu ba.The foda ne da farko compacted, sa'an nan sintered da machined, ko kafa ta extrusion, Isobaric forming, shafi forming, da calendering forming.
Matsi Molding
Yin gyare-gyaren matsawa shine mafi girmaPTFE yin gyaran fuskaHanyar da ake amfani da ita a halin yanzu don PTFE.Tsarin gyare-gyare shine hanyar da aka sanya wasu kayan gyare-gyare (foda, pellets, kayan fibrous, da dai sauransu) a cikin wani nau'i na karfe kuma ana yin su a wani yanayin zafi da matsa lamba.polymer ɗin da aka sarrafa ta hanyar gyare-gyaren matsawa baya iyakancewa da nauyin kwayoyinsa, kuma kusan dukkanin robobi ana iya sarrafa su ta hanyar matsawa.Babban halaye na gyare-gyaren matsawa sune: ƙananan farashi, kayan aiki mai sauƙi, ƙananan zuba jari, kuma ba'a iyakance ga nauyin kwayoyin halitta na filastik da aka sarrafa ba;rashin amfani shine ƙarancin samar da ingantaccen aiki, babban ƙarfin aiki, da ƙarancin ingancin samfur.Matsakaicin nauyin kwayoyin halitta na PTFE yayi girma da yawa kuma yawan ruwa yana da matukar talauci.Lokacin da sauran hanyoyin sarrafawa ba su da girma, ƙasashe a duniya galibi suna amfani da gyare-gyaren matsawa don sarrafa samfuran PTFE.
An raba ƙayyadaddun tsari na gyare-gyaren matsawa zuwa ① hanyar latsa-sinter-latsa;② Hanyar hanyar latsawa;③ saurin dumama hanyar latsawa;④ latsa da kuma sinter lokaci guda.
Hydroforming
Hanyar hydraulic kuma ana kiranta hanyar daidaitawa da kuma hanyar matsi daidai, wanda shine a sanya resin PTFE daidai tsakanin jakar roba da bangon mold, sannan a zuba ruwan (ruwa da aka saba amfani da shi) a cikin jakar roba, da jakar roba da ke haifarwa. matsa lamba yana faɗaɗa bangon ƙirƙira kuma ya haɗa Resin ya zama hanyar preforms.Ana iya amfani da wannan hanyar don kera manyan hannayen riga, tankunan ajiya na ƙasa, bawo, ginshiƙan hasumiya, manyan slabs, da sauransu, kuma ana iya amfani da su don kera tees, gwiwar hannu, kayan profiled, da dai sauransu tare da tsarin haɗin gwiwar PTFE mai haɗaka.Kayayyakin da hadaddun siffofi.Babban amfani da hydroforming shine tsarin sauƙi na kayan aiki da kayan aiki.Famfu na ruwa na yau da kullun yana maye gurbin latsa mai yawan ton.Samfurin yana matsawa daidai gwargwado, yana da daidaiton ƙima, yana iya kera manyan abubuwan haɗin gwiwa, yana da sifofi masu rikitarwa, da sassauƙan tsarin sutura.
Tura kafa
Ana kuma kiran turawamanna extrusionyin gyare-gyare.A 20-30 raga sieved dispersing guduro yana gauraye da Organic Additives (toluene, man fetur ether, sauran ƙarfi mai, da dai sauransu., da rabo daga guduro nauyi ne 1/5) don yin manna.An riga an danne shi a cikin zagaye mai kauri mai kauri mai sauƙi, sannan a saka shi a cikin kayan aikin latsa, sannan a yi amfani da plunger don samar da shi a ƙarƙashin dumama.Bayan bushewa, ana sanya shi a zafin jiki na 360 ~ 380C, kuma bayan sanyaya, ana samun bututu mai ƙarfi, sanda, da sauran samfuran.Abubuwan turawa suna iyakance ga sanduna masu diamita na 16mm ko ƙasa da haka da bututu masu kaurin bango na 3mm ko ƙasa da haka.
Karkace extrusion gyare-gyare
The dunƙule extruder na PTFE foda ya bambanta da extruder amfani ga sauran thermoplastics.Yin gyare-gyaren extrusion na Zengtong thermoplastics shine don ciyar da kayan gaba ta hanyar jujjuyawar dunƙule, yayin da kuma ke taka rawa na matsawa, yanke, da hadawa., Hakanan ana narkar da kayan ta hanyar zafin da ke haifar da ƙarfin ƙarfi da dumama waje na kayan.Screw na PTFE dunƙule extruder kawai yana taka rawar isarwa da turawa, don haka abu ya ratsa ta cikin kan madaidaicin dunƙule guda biyu tare da zaren nau'i biyu, daidaitaccen farar da zurfin daidai, sannan ya shiga cikin mutu don sintering, Cooling. da gyare-gyare tare da matsa lamba da aka bayar ta na'urar bugun baya don cimma manufar ci gaba.Lokacin sarrafa PTFE tare da mai fitar da dunƙule guda ɗaya, ana fuskantar manyan matsaloli sau da yawa.Saboda ƙarancin juzu'i na PTFE foda yana da ƙasa sosai, yana haifar da zamewa yayin tsarin ciyarwa, wanda ya rage girman isar da saƙo.Bugu da ƙari, saboda juzu'i da haɓakar zafi, foda na iya mannewa kan dunƙule ko ganga, yana sa ciyarwa ya fi wahala da rashin kwanciyar hankali.
A cikin 'yan shekarun nan, an kuma yi amfani da sukurori tagwaye wajen sarrafa kayan wannan yanayi na musamman.Ka'idodin ciyarwarsa ya bambanta da na masu fitar da dunƙule guda ɗaya.Yana da tasirin isarwa mai kyau kuma yana iya shawo kan zamewar UHMWPE foda a cikin dunƙule.Haɓaka ƙarfin ciyarwa sosai.Daga cikin su, da counter-juyawa twin-dunƙule extruder yana da mafi kyau hadawa da homogenization effects fiye da guda-juyawa tagwaye- dunƙule extruder, amma saboda da ya fi girma rabuwa da karfi, da shearing sakamako a dunƙule rata ne mafi girma, haifar da abu zuwa overheat. da extrude.Za a iya rage nauyin kwayoyin halitta na kayan fitarwa da kusan 40%.Idan tsakar gida ya fi girma kuma ba a haɗa sukurori ba, kayan za su manne da ƙarfe mai zafi.Duk da haka, yin amfani da haɗin gwiwar tagwaye-screw extruders ba shi da matsalolin da ke sama.Sakamakon shearing na abu a cikin extruder yana da ƙananan ƙananan, kuma zafi da ake buƙata don yin filastik duk daga tushen dumama na waje ne, don haka za'a iya sarrafa shi daidai yadda za a iya rage girman lalacewar kayan aiki a lokacin aikin extrusion, kuma a lokaci guda don kula da kwararar kayan da ke cikin injin na'ura na al'ada ne da kwanciyar hankali, kuma zane na girman sashin na'ura ya kamata ya dace da girman kayan da aka kawo ta hanyar kullun.Gudun juyawa na dunƙule ba zai iya yin sauri ba, gabaɗaya kusan juyi 10 a minti daya.Don kauce wa abu ba zato ba tsammani manne a saman karfe, da extrusion zafin jiki dole ne a kula sosai.
Plunger extrusion gyare-gyare
Plunger extrusion sarrafa robobi tsohuwar hanya ce ta sarrafa filastik.Tun bayan bullar kayan robobi, mutane sun fara amfani da wannan hanya wajen sarrafa robobi.Don aiwatar da PTFE tare da extruder na plunger, ana danna guduro mai ƙididdigewa a cikin mold, ana maida plunger, kuma an danna shi a cikin preform.Ta wannan hanyar, ana samun preforms da yawa a cikin mutuwa.Saboda juriya na juna tsakanin resin PTFE da gogayya tsakanin resin PTFE da bangon mutu, ana haifar da juriya.A lokaci guda kuma, haɓakar ƙarar preform lokacin da aka haɗa shi a cikin mutuwa shima yana haifar da juriya, ta yadda ya zama preform na kashi ɗaya.Sintering da sanyaya karkashin matsin suna samar da ci gaba gaba ɗaya.Abubuwan amfani da wannan hanya sune: babu raguwa a lokacin aikin gyaran gyare-gyare, an rage girman nauyin kwayoyin halitta, ingancin samfurin yana da kyau, kuma ba'a iyakance shi da nauyin kwayoyin halitta ba, kuma yana iya aiwatar da manyan diamita tare da diamita. matsakaicin diamita na 500mm da kauri na bango na kawai 3mm.Bututu.Koyaya, saboda ƙaramin yanki tsakanin albarkatun ƙasa da ɓangaren dumama yayin aikin aikawa, ƙimar dumama yana da ƙasa, wanda ke iyakance saurin fitar da shi.
Lokacin aikawa: Juni-14-2020