Matsayin narkewar crystallization na PTFE shine 327 ℃, amma guduro ba zai iya kasancewa a cikin yanayin narkewa ba har sai ya kasance sama da 380 ℃, kuma dankon narkewa ya kai 1 010 Pa * S.Bugu da ƙari, PTFE yana da ƙarfin juriya mai ƙarfi.Sabili da haka, ba zai iya narke hanyar sarrafawa ba, ba za a iya narkar da hanyar sarrafawa ba, yawanci samar da samfuransa na iya zama kamar ƙarfe da yumbura kawai - samfuri, ƙaddamar da foda na farko, sannan sintering da sarrafa injin, ko ta hanyar gyare-gyaren extrusion, latsa isotactic. gyare-gyare, shafi gyare-gyare da calendering gyare-gyaren da sauran hanyoyin da aiki.
Matsayin narkewar crystallization na PTFE shine 327 ℃, amma guduro ba zai iya kasancewa a cikin yanayin narkewa ba har sai ya kasance sama da 380 ℃, kuma dankon narkewa ya kai 1 010 Pa * S.Bugu da ƙari, PTFE yana da ƙarfin juriya mai ƙarfi.Sabili da haka, ba zai iya narke hanyar sarrafawa ba, ba za a iya narkar da hanyar sarrafawa ba, yawanci samar da samfuransa na iya zama kamar ƙarfe da yumbura kawai - samfuri, ƙaddamar da foda na farko, sannan sintering da sarrafa injin, ko ta hanyar gyare-gyaren extrusion, latsa isotactic. gyare-gyare, shafi gyare-gyare da calendering gyare-gyaren da sauran hanyoyin da aiki.
1. Yin gyare-gyare
Yin gyare-gyare a halin yanzu shine hanyar da aka fi amfani da ita don PTFE.Fasahar gyare-gyarewani takamaiman kayan gyare-gyare ne (foda, granule, kayan fibrous, da sauransu) a cikin ƙirar ƙarfe, a cikin - - ƙayyadaddun zafin jiki, matsa lamba - - hanyar kafawa.Abubuwan da aka ƙera ba su da iyaka da nauyin kwayoyin su, kuma kusan dukkanin robobi ana iya yin su.Babban fasali na gyare-gyaren su ne;Ƙananan farashi, kayan aiki mai sauƙi, ƙananan zuba jari, ba'a iyakance ta nauyin kwayoyin halitta na robobi da aka sarrafa ba;Rashin lahani shine ƙarancin samar da ingantaccen aiki, babban ƙarfin aiki da ƙarancin ingancin samfur.PTFE yana da babban nauyin kwayoyin halitta kuma yana da ƙarancin ruwa sosai.Lokacin da sauran hanyoyin sarrafawa ba su girma ba, samfuran PTFE galibi ana sarrafa su ta hanyar yin gyare-gyare a duk faɗin duniya.
A cikin gyare-gyaren za a iya raba zuwa hanyoyi biyar bisa ga bambancin takamaiman tsari: (1) danna - hanyar yin latsawa (wanda kuma aka sani da hanyar sintirin kyauta) Hanyar;(5) Hanyar latsawa da ɓata lokaci guda.
2. Hanyar Hydroform
Hanyar matsa lamba na hydraulic, wanda kuma aka sani da hanyar daidaitawa, hanyar matsa lamba isobaric ko hanyar gyare-gyaren roba, shine ƙara resin PTFE daidai tsakanin jakar da bangon ƙira, sannan zuwa jakar cikin ruwa (ruwa da aka saba amfani da shi), matsa lamba na jakar roba zuwa fadada bangon mold, ƙaddamar da guduro kuma ya zama samfurin da aka riga aka tsara - hanya.Ana iya amfani da wannan hanyar don kera babban hannun riga, tankin ajiya na kasa, harsashi hemispheric, ginshiƙin hasumiya, babban slab, da dai sauransu, da kuma samfuran hadaddun tare da tsarin haɗin gwiwar PTFE, kamar Tee, gwiwar hannu da bayanin martaba.Babban abũbuwan amfãni daga na'ura mai aiki da karfin ruwa gyare-gyaren su ne sauki tsarin na kayan aiki da mold - wani na kowa ruwa famfo maye gurbin high-tonnage latsa, da kuma kayayyakin da aka matsa a ko'ina da kuma m - sakamakon da kerar da manyan aka gyara, hadaddun siffofi da kuma sauki rufi tsarin. .
3. Tura gyare-gyare
Har ila yau, an san matsa lamba a matsayin manna extrusion gyare-gyare, 20-30 raga sieve na watsawa guduro da Organic Additives (toluene, man fetur ether, sauran ƙarfi mai, rabo na guduro nauyi na 1/5) gauraye a cikin manna, prepress a cikin lokacin farin ciki bango cylindrical blank , sa'an nan kuma saka a cikin injin daskarewa, a ƙarƙashin dumama tare da gyare-gyaren turawa na plunker.Bayan bushewa da sintering a zazzabi na 360 ~ 380 ° C, ana samun ƙarfi da ƙarfi da ƙarfi da bututun matsa lamba da samfuran mashaya bayan sanyaya.Abubuwan turawa da latsawa suna iyakance ga sanda tare da diamita na 16mm ko ƙasa da bututu tare da kauri na bango na 3mm ko ƙasa da haka.
4. Karkace extrusion gyare-gyare
The dunƙule extruder na PTFE foda ya bambanta da extruder amfani da sauran thermoplastic robobi.Gyaran extrusion na robobi na thermoplastic na yau da kullun shine don tura kayan gaba tare da taimakon jujjuyawar dunƙule, a halin yanzu don damfara, juye da haɗa kayan.Hakanan ana narkar da kayan ta hanyar zafin da ke haifar da ƙarfin ƙarfi da dumama waje na silinda kayan.Duk da haka, dunƙule na PTFE extruder kawai taka rawar isar da turawa, don haka abu ya ratsa ta cikin kan wani dunƙule extruder da guda biyu-head thread da wannan farar da zurfin, sa'an nan kuma ya shiga cikin bakin mold domin. sintering da sanyaya, da kuma siffofi tare da matsa lamba bayar da counter-matsa lamba na'urar don cimma ci gaba da manufa.Yana da wahala sau da yawa sarrafa PTFE ta dunƙule extruder guda ɗaya.Rashin ƙarancin juzu'i na PTFE foda yana haifar da skidding yayin tsarin ciyarwa, wanda ke rage ƙarfin isar da dunƙule.Kuma saboda tsananin zafi, yana iya yin manne da foda zuwa dunƙule ko ganga, yana sa ciyarwar ta fi wahala da rashin kwanciyar hankali.
A cikin 'yan shekarun nan, an kuma yi amfani da tagwaye-screw a cikin kayan sarrafawa na wannan yanayi na musamman.Ka'idodin ciyarwarsa ya bambanta da na mai fitar da iska guda ɗaya, kuma yana da ingantaccen aikin sufuri, wanda zai iya shawo kan matsalar zamiya ta foda na UHMWPE a cikin dunƙule kuma yana haɓaka ƙarfin ciyarwa na dunƙule.The counter-juyawa tagwaye- dunƙule extruder yana da mafi kyau hadawa da homogenization sakamako fiye da guda-direction twin- dunƙule extruder, amma saboda da ya fi girma rabuwa da karfi, da shearing mataki a rata na dunƙule ne ya fi girma, wanda ya sa kayan zuwa overheat. , kuma nauyin kwayoyin halitta na extruder zai iya saukewa da kusan 40%. Idan rata ya yi girma kuma ba a haɗa kullun ba, kayan zai tsaya ga karfe mai zafi.Duk da haka, yin amfani da wannan juyi na twin dunƙule extruder, babu irin wannan matsala.Material a cikin extruder ta hanyar sausaya mataki na karami, plasticizing da ake bukata yawa na zafi, duk daga da zafi Madogararsa, kuma ta haka ne zai iya zama daidai iko, wanda zai iya yin abu a cikin extrusion tsari don rage zafi da lalacewa, a lokaci guda. don kula da kwararar kayan abu na al'ada da kwanciyar hankali a cikin hanci, girman sashin hanci na ƙira ya kamata ya dace da ƙarar kayan isar da dunƙule.Gudun dunƙule baya sauri, gabaɗaya kusan juyi 10 a cikin minti ɗaya.Don kaucewa abu ba zato ba tsammani manne a saman karfe, zafin extrusion dole ne a sarrafa sosai.
5. Plunger extrusion gyare-gyare
Plunger extrusion sarrafa filastik, sarrafa filastik wata hanya ce ta daɗaɗɗa, tun da fitowar wannan abu, mutane sun fara amfani da wannan hanyar don sarrafa filastik.Ana sarrafa PTFE tare da mai fitar da plunger ta hanyar danna guduro mai ƙididdigewa a cikin ƙwanƙolin mashigai, yin plunger ya rama sannan a danna shi cikin samfurin da aka riga aka tsara.Don haka baya da baya, a cikin bakin ƙirƙira don samar da samfuran gyare-gyare da yawa - mataki-mataki.Saboda gogayya tsakanin PTFE guduro da gogayya tsakanin PTFE guduro da mold bango, da kuma girma fadada da preformed samfurin a lokacin sintering a cikin mold, da preformed samfurin ne sintered da sanyaya a cikin wani ci gaba gaba daya karkashin matsa lamba.Amfanin wannan hanya sune kamar haka: babu raguwa a cikin tsarin gyaran gyare-gyare, nauyin kwayoyin halitta ya ragu kadan, ingancin samfurin yana da kyau, kuma ba'a iyakance shi da nauyin kwayoyin halitta ba.Duk da haka, saboda ƙananan yanki na hulɗar tsakanin albarkatun albarkatun kasa da sassan dumama a cikin tsari na extrusion, aikin dumama yana da ƙasa, wanda ke iyakance saurin extrusion.
6. Sauran hanyoyin sarrafawa;
PTFE kuma za a iya sarrafa ta allura gyare-gyare, calendering gyare-gyare, shafi gyare-gyare ko sakandare gyare-gyare.
Lokacin aikawa: Yuli-31-2018