Kev ua haujlwm ntawm PDC cutters rau roj thiab roj yog hauv paus hauv lawv cov khoom siv sib xyaw ua ke thiab cov pob zeb tshawb fawb- rhuav tshem cov txheej txheem, uas ua ke ua lub hauv paus rau kev ua haujlwm tau zoo thiab txhim khu kev qha.
Lub hauv paus tseem ceeb ntawm lawv cov kev ua haujlwm feem ntau yog nyob rau hauv kev sib koom ua ke ntawm ultra- cov ntaub ntawv nyuaj. Lub cutter yog tsim los ntawm siab - kub thiab siab - siab sintering ntawm ib tug nto polycrystalline pob zeb diamond txheej thiab ib tug cemented carbide matrix. Cov pob zeb diamond txheej, nrog micron- pob zeb diamond me me raws li nws lub hauv paus, tsim ib qho txuas ntxiv peb-sib nqus qauv los ntawm cov hlau catalyst, muab nws ultra-siab hardness (8000-}10000 HV) thiab zoo heev hnav tsis kam, mus txog lub ntuj pob zeb diamond, tso cai rau nws ncaj qha mus txiav rau hauv pob zeb thiab shears. Cov cemented carbide matrix, nrog tungsten carbide raws li nws lub moj khaum thiab cobalt raws li nws cov binder theem, muab siab - kev txhawb zog thiab kev cuam tshuam toughness, zoo dispersing hauv qab- qhov cov tshuaj tiv thaiv lub qhov thiab tiv thaiv lub pob zeb diamond txheej ntawm fracturing vim ntau brittleness. Lub metallurgical daim ntawv cog lus nruab nrab ntawm ob txheej ua kom lub cev tsis sib xws ntawm kev thauj khoom, ua kom muaj kev sib koom ua ke ntawm "siab hardness thiab hnav tsis kam- muaj zog thiab hnyav load-bearing peev."
Ua raws li lub hauv paus no, lub pob zeb nruam shearing - rhuav tshem mechanism tsim cov kev ua haujlwm zoo rau kev ua haujlwm zoo. Tsis zoo li qhov cuam tshuam -raws li fracturing hom ntawm cov menyuam lub khob hliav qab cov khoom, PDC cutter siv lub siab -ceev txheeb ze zog thaum lub sij hawm rotary propulsion rau exert shear quab yuam ntawm lub pob zeb nto los ntawm cov pob zeb diamond txheej ntawm lub siab tsis tu ncua. Qhov no induces yas deformation thiab microcrack propagation nyob rau hauv lub pob zeb, thaum kawg nws tawg mus rau hauv fragments. Cov txheej txheem no ua rau muaj kev siv hluav taws xob tsawg thiab kev txiav du, ua rau nws tsim tshwj xeeb rau cov mos mus rau nruab nrab- nyuaj homogeneous formations, ho nce drilling ceev thiab txo lub zog noj.
Tsis tas li ntawd, thermal stability thiab geometric adaptability txhim khu kev ntseeg tau. Pob zeb diamond qis coefficient ntawm thermal expansion thiab siab thermal conductivity tso cai rau nws kom muaj kev ruaj ntseg zoo txawm nyob rau hauv qhov kub thiab txias generated los ntawm high - txiav ceev, tiv thaiv thermal puas. Lub cutter tus duab (lub voj voog, conical, thiab lwm yam), qhov loj me, thiab array tuaj yeem kho raws li tus yam ntxwv tsim. Los ntawm kev ua kom zoo tshaj qhov txiav ntug qhov siab thiab cov yas profile, tag nrho - kev pab cuam txiav hauv qab ntawm lub qhov dej tau ua tiav, txo qis kev rov ua dua thiab hnav tsis sib xws.
Hauv cov ntsiab lus, lub hauv paus ua haujlwm ntawm PDC cutter yog qhov tshwm sim los ntawm kev sib xyaw ua ke ntawm kev ua tau zoo ntawm cov khoom siv sib xyaw, kev ua haujlwm zoo ntawm cov pob zeb tawg, thiab cov qauv tsim ntawm kev hloov pauv ib puag ncig. Kev sib koom ua ke ntawm peb yam no ua kom nws ruaj khov thiab ntev - pob zeb tawg ua haujlwm tau zoo hauv cov roj thiab roj drilling.
