Isingeniso:Ngokuvamile, ukunemba komkhiqizo we-PTFE akulula ukulawula ngoba i-coefficient yayo yokunwetshwa komugqa iphakeme kunaleyo yezinsimbi, futhi izinga lokushisa layo elilodwa lokushintsha ivolumu lizungeze izinga lokushisa legumbi kubangela ukuthi ivolumu ishintshe cishe ngo-1 kuya ku-2%.Ngaphezu kwalokho, imikhiqizo ye-PTFE enezindonga ezincane iyaziwa ukuthi inzima ukwenza imishini ngoba akuyona nje i-PTFE eguquguqukayo futhi enwebekayo, kodwa futhi nokucindezeleka okusalayo kuhlala ngemva kokubumba ngezinye izikhathi ukonakala ngenxa yokushisa okungqubuzanayo okukhiqizwa phakathi nenqubo yomshini noma ngenxa yokuguga ngemva komshini.Ukuguqulwa okunjalo kungaba nomthelela ekunembeni kobukhulu.
Mayelana nokunemba kokucubungula, imikhiqizo ye-PTFE kwesinye isikhathi idingeka ukubekezelela okulinganayo okuvumelekile okufana nokokusebenza kwensimbi.Ezimweni ezinjalo, izici ze-PTFE ezichazwe ngenhla zingadala izinkinga phakathi kwabasebenzisi nabakhiqizi.Ngalesi sizinda, lo mbiko uchaza ukunemba kokucubungula kwe-PTFE.
Ukubekezelelana Okujwayelekile Okuvumelekile
Leli zinga libeka ubukhulu obusuka ku-1mm kuye ku-1000 mm lapho okokusebenza komkhiqizo obunjiwe we-PTFE kwenziwa ngomshini ngokuminyanisa noma ukubunjwa kwe-extrusion.Igama elithi “okujwayelekile” elisetshenziswe kuleli zinga lisho ukuthi izinga lingasetshenziswa uma ipulani lingabonisi zibalo noma izimpawu.
Lapho ukala ukunemba kokucubungula kwe-PTFE, izici ezilandelayo ezibalulekile ze-PTFE kufanele
kucatshangelwe:
1. PTFE has low conductivity ezishisayo.
2. I-PTFE ine-coefficient ephezulu yokunwetshwa komugqa.
3. Ivolumu ye-PTFE ishintsha ngokuphawulekayo (cishe ngo-1 kuya ku-2%) cishe ngo-23°C.
4. I-PTFE iyanwebeka.
5. I-PTFE kwesinye isikhathi iba nengcindezi eyinsalela.
Kusukela kokungenhla, ubuncane bokubekezelela kobukhulu be-PTFE bucishe bube ±0.05 mm noma uhhafu yenani elishiwo ku-JIS K 6884 (ibanga 1), nakuba ukunemba komshini we-PTFE kuncike kusayizi nokuma.
Nokho, ngenxa yokunwebeka kwe-PTFE, inani elinembile lingahluka uma isiphetho sedivayisi yokulinganisa siphushwa ngokuqinile kusifanekiso se-PTFE.Isibonelo, umehluko okungenani ongu-0.1 mm kumanani akalwayo ngezinye izikhathi uyenzeka kuye ngokuthi i-micrometer iphushwa kanjani kusifanekiso se-PTFE.Abasebenzisi nabakhiqizi kufanele bacabangele leli phuzu.
Imiphumela Yokwelashwa Kwe-Annealing
Ngokuvamile, inqubo ye-sintering (yokubhaka) yamahhala isetshenziswa ku-PTFE ngemva kokubunjwa kokucindezelwa.Ngesikhathi sintering, ukucindezeleka kwangaphakathi kwe-PTFE kungancipha uma kuqhathaniswa nemikhiqizo ebunjiwe ngenqubo yokuhlanganisa (inqubo lapho into ifakwa esikhunjeni bese ipholiswa ngaphansi kwengcindezi) ungqimba wayo wangaphandle ucinywa.
Nokho, ukwelashwa kwe-annealing* kusetshenziswa kokokusebenza uma kudingeka ukunemba kobukhulu obuphakeme noma umumo womkhiqizo uyinkimbinkimbi.
Ukuqeda ukucindezeleka kwangaphakathi okukhiqizwa phakathi nenqubo yokubumba kuyindlela ephumelelayo yokuthuthukisa ukunemba kwe-dimensional nokuvimbela ekushintsheni kwayo ngokuhamba kwesikhathi.
*Annealing: Inqubo lapho imikhiqizo ebunjiwe ipholiswa kancane ngezinga lokushisa elinikeziwe ukuze kususwe ingcindezi yangaphakathi ekhiqizwa ukushisa noma ukucindezelwa komshini.
Ukuqina Kobuso
Njengoba kushiwo ku-General Tolerance ye-Polytetrafluoroethylene (Ukusikwa Komshini), izici zezinto ezibonakalayo kufanele zicatshangelwe lapho kusethwa ivelu yokuqina kwendawo.
Njengoba i-resin ithintwa ukushisa phakathi nomshini endaweni futhi inokunwebeka, inani elingaphezulu-mahhedla alikwazanga ukulingana nendawo yensimbi eyenziwe ngomshini.
Ngokuvamile, umehluko ekuqedeni kobunzima obungaphezulu ubangelwa izimo zomshini ezihlanganisa isivinini sokujikeleza nesokudla kanye namathuluzi okusika (ama-blades).
Izimpawu zangaphambili zethulwa cishe eminyakeni engama-60 edlule, futhi ziyaziwa kakhulu.Kuzothatha isikhathi ukuthi izimpawu ezintsha zaziwe kubakhiqizi bama-peripheral.Ngaphezu kwalokho, esimweni sezingxenye zokusebenza, amasu akhona avame ukulandelwa.Ngakho-ke, kubalulekile ukuqonda ubudlelwano phakathi kwezimpawu ezintsha nezangaphambili.
Isikhathi sokuthumela: Jan-14-2019