Chiyambi:Nthawi zambiri, kulondola kwa PTFE mankhwala si kophweka kulamulira chifukwa coefficient yake ya kukula liniya ndi apamwamba kuposa zitsulo, ndi mmodzi wa voliyumu kusintha kutentha ndi kuzungulira chipinda kutentha zimayambitsa voliyumu kusintha pafupifupi 1 mpaka 2%.Komanso, woonda-mipanda mankhwala PTFE amadziwika kuti n'zovuta Machining chifukwa osati PTFE ndi kusintha ndi zotanuka zakuthupi, komanso zotsalira nkhawa amakhalabe pambuyo akamaumba nthawi zina kupunduka chifukwa frictional kutentha kwaiye pa ndondomeko Machining kapena chifukwa cha ukalamba pambuyo Machining.Kusinthika koteroko kungakhudze kulondola kwa dimensional.
Ponena za kulondola kwa processing, zinthu za PTFE nthawi zina zimafunikira kulolerana kovomerezeka komweko ngati chitsulo.Zikatero, makhalidwe a PTFE tafotokozazi zingachititse mavuto pakati owerenga ndi opanga.Ndi maziko awa, lipoti ili likufotokozera kulondola kwa PTFE.
General Permissible Dimensional Tolerance
Muyezo uwu umanena miyeso yoyambira 1mm mpaka 1000 mm pomwe zinthu za PTFE zopangidwa ndi PTFE zimapangidwa ndi makina oponderezedwa kapena kuumba.Mawu oti "akuluakulu" omwe amagwiritsidwa ntchito mu muyezo uwu amatanthauza kuti mulingo utha kugwiritsidwa ntchito ngati pulani ilibe ziwerengero kapena zizindikilo.
Pamene kuyeza processing kulondola kwa PTFE, zotsatirazi zofunika makhalidwe a PTFE ayenera
kuganiziridwa:
1. PTFE ali otsika matenthedwe madutsidwe.
2. PTFE ali mkulu koyefila wa liniya kukula.
3. Voliyumu ya PTFE ikusintha kwambiri (pafupifupi 1 mpaka 2%) pafupifupi 23°C.
4. PTFE ndi zotanuka.
5. PTFE nthawi zina amakhala ndi nkhawa yotsalira.
Kuchokera pamwamba, PTFE a dimensional osachepera kulolerana ndi pafupifupi ± 0.05 mamilimita kapena theka mtengo zinanenedwa JIS K 6884 (kalasi 1), ngakhale PTFE a Machining molondola zimadalira kukula ndi mawonekedwe.
Komabe, chifukwa cha elasticity ya PTFE, mtengo wolondola ukhoza kukhala wosiyanasiyana ngati mapeto a chipangizo choyezera akankhidwira mwamphamvu pa chitsanzo cha PTFE.Mwachitsanzo, kusiyana kwa osachepera 0.1 mm mu miyeso yoyezera nthawi zina kumachitika malingana ndi momwe micrometer imakankhira pa chitsanzo cha PTFE.Ogwiritsa ntchito ndi opanga ayenera kuganizira mfundoyi.
Zotsatira za Chithandizo cha Annealing
Nthawi zambiri, njira ya sintering yaulere (kuphika) imagwiritsidwa ntchito ku PTFE pambuyo pakumangirira.Pa sintering, PTFE a mkati nkhawa akhoza utachepa poyerekeza ndi kuumbidwa mankhwala ndi coining ndondomeko (ndondomeko imene zinthu sintered mu nkhungu ndiyeno utakhazikika pansi pa mavuto) amene wosanjikiza kunja kuzimitsidwa.
Komabe, chithandizo cha annealing* chimagwiritsidwa ntchito pazinthuzo ngati pakufunika kulondola kwambiri kapena mawonekedwe ake ndi ovuta.
Kuchotsa kupsinjika kwamkati komwe kumapangidwa panthawi yakuumba ndi njira yabwino yopititsira patsogolo kulondola kwazithunzi ndikupewa kusintha kwake pakapita nthawi.
*Annealing: Njira yomwe zinthu zoumbidwa zimaziziritsidwa pang'onopang'ono pa kutentha komwe kwapatsidwa kuti achotse nkhawa zamkati zomwe zimadza chifukwa cha kutentha kapena kupsinjika kwamakina.
Kukalipa Pamwamba
Monga momwe zafotokozedwera mu General Tolerance for Polytetrafluoroethylene (Machine Cut), mawonekedwe azinthu ayenera kuganiziridwa pokhazikitsa mtengo wazovuta.
Popeza utomoni umakhudzidwa ndi kutentha panthawi yopangira makina pamtunda ndipo uli ndi elasticity, kufunika kwapamwamba sikungafanane ndi chitsulo chopangidwa ndi makina.
Nthawi zambiri, kusiyana kwa kutha kwa roughness ya pamwamba kumayamba chifukwa cha makina osinthira kuphatikiza kuthamanga ndi kudyetsa ndi zida zodulira (masamba).
Zizindikiro zakale zidayambitsidwa pafupifupi zaka 60 zapitazo, motero zimadziwika bwino.Zidzatenga nthawi kuti zizindikiro zatsopano zidziwike pakati pa opanga zotumphukira.Kuonjezera apo, pazigawo zogwira ntchito, njira zomwe zilipo zimakonda kutsatiridwa.Choncho, ndikofunikira kumvetsetsa mgwirizano pakati pa zizindikiro zatsopano ndi zakale.
Nthawi yotumiza: Jan-14-2019