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Baseshi ba daemane ea polycrystalline (PDC)

Taemane ke ntho e thata ka ho fetisisa e tsejoang. Ho thatafala hona ho e fa thepa e phahameng bakeng sa ho seha lisebelisoa tse ling. PDC e bohlokoa haholo ho cheka, hobane e kopanya litaemane tse nyane, tse sa bitseng chelete e ngata, tse entsoeng ka matsoho hore e be bongata bo boholo ba likristale tse ikhethileng tse ka bopang libopeho tse sebetsang tse bitsoang litafole tsa litaemane. Litafole tsa litaemane ke karolo ea sehang se kopanyang sebopeho. Ntle le ho thatafala ha tsona, litafole tsa litaemane tsa PDC li na le tšobotsi ea bohlokoa bakeng sa li-cutter-bit cutters: Li tlamahane hantle le thepa ea tungsten carbide e ka kopantsoang (e hoketsoeng) ho mmele o monyane. Litaemane, ka botsona, li ke ke tsa tlamahana, kapa hona ho hokahanngoa ka ho khabisa.

Daemane ea maiketsetso

Diamond grit e tloaetse ho sebelisoa ho hlalosa lithollo tse nyane (≈0.00004 ho.) Tsa daemane ea maiketsetso e sebelisitsoeng e le sesebelisoa sa mantlha sa lihlahisoa tsa li-cutter tsa PDC. Mabapi le lik'hemik'hale le thepa, daemane e entsoeng ke motho e ts'oana le taemane ea tlhaho. Ho etsa grit ea daemane ho kenyelletsa ts'ebetso e bonolo ea lik'hemik'hale: khabone e tloaelehileng e futhumatsoa tlas'a khatello e phahameng haholo le mocheso. Ha e le hantle, ha e le hantle ho etsa daemane ha ho bonolo.

Likristale ka bomong tsa litaemane tse fumanehang ho grit ea daemane li sekametse ka tsela e fapaneng. Sena se etsa hore thepa e be matla, e be bohale, 'me, ka lebaka la thatafalo ea daemane e nang le eona, e roale haholo. Ebile, sebopeho se ikhethileng se fumanoeng ka daemane ea maiketsetso e sebetsa hantle ho kuta ho feta litaemane tsa tlhaho, hobane litaemane tsa tlhaho ke likristale tsa khubiki tse robehang habonolo moeling oa tsona o hlophisehileng, oa likristale.

Diamond grit ha e tsitsitse maemong a phahameng ho feta daemane ea tlhaho, leha ho le joalo. Hobane tšepe e kenelletseng mohahong oa grit e na le sekhahla se phahameng sa keketseho ea mocheso ho feta daemane, katoloso e fapaneng e beha litlamo tsa taemane-to-daemane tlas'a shear mme, haeba mejaro e phahame ka ho lekana, e baka ho hloleha. Haeba litlamo li sa atlehe, litaemane li lahleha kapele, ka hona PDC e lahleheloa ke thatafalo le bohale ba eona 'me e fetoha e sa sebetseng. Ho thibela ho hloleha ho joalo, lihahi tsa PDC li tlameha ho pholisoa ka nepo nakong ea ho cheka.

Litafole litaemane

Ho etsa tafole ea daemane, grit ea daemane e entsoe ka tungsten carbide le metallic binder ho theha lera le nang le taemane. Li bopehile joaloka sefahleho, 'me li lokela ho etsoa tse tenya ka hohle kamoo ho ka khonehang, hobane bophahamo ba daemane bo eketsa bophelo. Litafole tsa litaemane tse boleng bo phahameng ka ho fetisisa ke ≈2 ho isa ho 4 mm, 'me tsoelo-pele ea mahlale e tla eketsa botenya ba tafole ea taemane. Li-substrate tsa Tungsten carbide hangata li ≈0.5 ka hare 'me li na le sebopeho le litekanyo tse tšoanang le tsa tafole ea taemane. Likarolo tse peli, tafole ea daemane le substrate, li etsa sehang (sa feiga 4).

Ho etsa PDC ka libopeho tse sebetsang bakeng sa ba sehang ho kenyelletsa ho beha grit ea daemane, hammoho le substrate ea eona, ka sejaneng sa khatello ebe o sintara mocheso o phahameng le khatello.

Basebelisi ba PDC ba ke ke ba lumelloa ho feta mocheso oa 1,382 ° F [750 ° C]. Mocheso o feteletseng o hlahisa ho tsofala ka potlako, hobane phapang ea mocheso o pakeng tsa binder le daemane e tloaetse ho senya likristale tsa daemane tse kopaneng tafoleng ea litaemane. Matla a tlamo pakeng tsa tafole ea taemane le substrate ea tungsten carbide le eona e kotsing ka lebaka la katoloso ea mocheso.


Nako ea poso: Apr-08-2021