Intshayelelo:Ngokubanzi, ukuchaneka kwemveliso ye-PTFE akulula ukuyilawula kuba i-coefficient yayo yokwandiswa komgca iphezulu kuneentsimbi, kwaye enye yobushushu benguqu yevolumu ijikeleze ubushushu begumbi kubangela utshintsho lwevolumu malunga ne-1 ukuya kwi-2%.Ngaphezu koko, iimveliso ze-PTFE ezibhityileyo ziyaziwa ukuba zinzima ukwenza i-machining ngenxa yokuba kungekuphela nje i-PTFE eguquguqukayo kunye ne-elastic material, kodwa kunye noxinzelelo olushiyekileyo luhlala luhlala emva kokubumba ngamanye amaxesha lukhubaza ngenxa yobushushu obukhukhulayo obuveliswa ngexesha lenkqubo yomatshini okanye ngenxa yokuguga emva komatshini.Olo tshintsho lunokuchaphazela ukuchaneka komda.
Ngokumalunga nokuchaneka kokusetyenzwa, iimveliso ze-PTFE ngamanye amaxesha zifunwa ukunyamezela okuvumelekileyo okulinganayo okufana nemathiriyeli yesinyithi.Kwiimeko ezinjalo, iimpawu ze-PTFE ezichazwe ngasentla zinokubangela iingxaki phakathi kwabasebenzisi kunye nabavelisi.Ngale mvelaphi, le ngxelo ichaza ukuchaneka kokulungiswa kwe-PTFE.
Unyamezelo oluPhambili oluvumelekileyo
Lo mgangatho uchaza imilinganiselo ukusuka kwi-1mm ukuya kwi-1000 mm xa izinto zemveliso ezibunjiweyo ze-PTFE zenziwe ngoomatshini ngokunyanzeliswa okanye ukubunjwa kwe-extrusion.Igama elithi “jikelele” elisetyenziswe kulo mgangatho lithetha ukuba umgangatho ungasetyenziswa xa iplani ingabonakalisi manani okanye iisimboli.
Xa ulinganisa ukuchaneka kokusetyenzwa kwe-PTFE, ezi mpawu zilandelayo ezibalulekileyo ze-PTFE kufuneka
kuthathelwe ingqalelo:
1. I-PTFE ine-conductivity ephantsi ye-thermal.
2. I-PTFE ine-coefficient ephezulu yolwandiso lomgca.
3. Umthamo we-PTFE utshintsha ngokuphawulekayo (malunga ne-1 ukuya kwi-2%) malunga ne-23°C.
4. I-PTFE iyalastiki.
5. I-PTFE ngamanye amaxesha inoxinzelelo olushiyekileyo.
Ukusuka apha ngasentla, ubuncinci bonyamezelo lwe-PTFE lumalunga ne-±0.05 mm okanye isiqingatha sexabiso elichazwe kwi-JIS K 6884 (ibakala 1), nangona ukuchaneka komatshini we-PTFE kuxhomekeke kubungakanani kunye nokumila.
Nangona kunjalo, ngenxa ye-elasticity ye-PTFE, ixabiso elichanekileyo linokwahluka ukuba isiphelo sesixhobo sokulinganisa sityhalwe ngamandla ngokuchasene nomzekelo we-PTFE.Umzekelo, umahluko ubuncinci be-0.1 mm kumaxabiso alinganisiweyo ngamanye amaxesha kwenzeka ngokuxhomekeke kwindlela i-micrometer etyhalwa ngayo kumzekelo we-PTFE.Abasebenzisi kunye nabavelisi kufuneka baqwalasele le ngongoma.
Iziphumo zoNyango lweAnealing
Ngokuqhelekileyo, inkqubo yokubhaka simahla isetyenziswa kwi-PTFE emva koxinzelelo lokubumba.Ngexesha sintering, uxinzelelo lwangaphakathi lwe-PTFE lunokwehliswa thelekisa kunye neemveliso ezibunjiweyo kunye nenkqubo yokudibanisa (inkqubo apho i-material sintered kwi-mold kwaye ipholile phantsi koxinzelelo) umaleko wayo wangaphandle ucinywa.
Nangona kunjalo, unyango lwe-annealing* lusetyenziswa kwimathiriyeli xa kufuneka ukuchaneka komgangatho ophezulu okanye ubume bemveliso buntsokothile.
Ukuphelisa uxinzelelo lwangaphakathi oluveliswa ngexesha lokubumba kuyindlela efanelekileyo yokuphucula ukuchaneka kwe-dimensional kunye nokukhusela ekutshintsheni kwayo ngexesha.
*Annealing: Inkqubo apho iimveliso ezibunjiweyo zipholiswa kancinane kwiqondo lobushushu elinikiweyo ukususa uxinzelelo lwangaphakathi oluveliswa bubushushu okanye uxinzelelo lomatshini.
Uburhabaxa boMphezulu
Njengoko kuchaziwe kwi-General Tolerance ye-Polytetrafluoroethylene (Ukusikwa koMtshini), iimpawu zezinto eziphathekayo kufuneka zithathelwe ingqalelo xa ubeka ixabiso le-surface-roughness.
Ekubeni i-resin ichatshazelwa bubushushu ngexesha lokwenziwa komatshini phezu komhlaba kwaye ine-elasticity, ixabiso le-face-roughness alinakulingana nomphezulu wesinyithi owenziwe ngomatshini.
Ngokubanzi, umahluko ekugqityweni koburhabaxa bomphezulu ubangelwa ziimeko zomatshini ezibandakanya ukujikeleza kunye nesantya sokutya kunye nezixhobo zokusika (iiblades).
Iisimboli zangaphambili zaziswa malunga neminyaka engama-60 eyadlulayo, kwaye ke ziyaziwa.Kuya kuthatha ixesha ukuba iisimboli ezintsha zaziwa phakathi kwabavelisi be-peripheral.Ukongezelela, kwimeko yamacandelo asebenzayo, iindlela ezikhoyo zivame ukulandelwa.Ngoko ke, kubalulekile ukuqonda ubudlelwane phakathi kweesimboli ezintsha kunye nezangaphambili.
Ixesha lokuposa: Jan-14-2019