I. Thermal kupfeka uye cobalt kubviswa kwePDC
Mune yakanyanya kudzvanywa sintering maitiro ePDC, cobalt inoita sechinhu chinokurudzira kusanganisa kwakananga kwedhaimani nedhaimani, uye kuita kuti dhaimondi layer uye tungsten carbide matrix ive yakazara, zvichikonzera PDC yekucheka mazino akakodzera mafutafield geological drilling nekusimba kwakanyanya uye nekunaka kupfeka kuramba,
Madhaimondi ekupisa kupisa ane mashoma. Pasi pekumanikidzwa kwemuchadenga, pamusoro pedhaimondi inogona kushanduka patembiricha yakatenderedza 900 ℃ kana kupfuura. Panguva yekushandiswa, maPDC echinyakare anowanzo dzika kusvika pa750 ℃. Pakuchera nepakati pematombo akaoma uye abrasive, maPDC anogona kusvika nyore nyore tembiricha iyi nekuda kwekupisa kwemhepo, uye tembiricha yepakarepo (kureva, tembiricha yepanzvimbo padanho remicroscopic) inogona kutokwirira, kudarika panonyungudika yecobalt (1495 ° C).
Kuenzaniswa nedhaimondi rakachena, nekuda kwekuvapo kwecobalt, dhaimondi rinoshandura kuita graphite pakudzika kwakadzika. Nekuda kweizvozvo, kupfeka kwedhaimani kunokonzerwa negraphitization inokonzerwa nekupisa kwenzvimbo. Pamusoro pezvo, kupisa kwekuwedzera kwe cobalt kwakakwira zvakanyanya kupfuura kwedhaimondi, saka panguva yekupisa, kubatana pakati pezviyo zvedhaimani kunogona kukanganiswa nekuwedzera kwecobalt.
Muna 1983, vaongorori vaviri vakaita kurapwa kwekubvisa madhaimondi pamusoro peiyo yakajairwa PDC madhaimani akaturikidzana, zvakanyanya kusimudzira mashandiro ePDC mazino. Zvisinei, chigadzirwa ichi hachina kuwana ngwariro chaikodzera. Zvakanga zvisati zvasvika mushure megore ra2000 kuti, nekunzwisisa kwakadzama kwePDC madhaimani akaturikidzana, vatengesi vekuchera vakatanga kushandisa tekinoroji iyi kumeno ePDC anoshandiswa mukuchera dombo. Mazino anobatwa neiyi nzira akakodzera kuumbwa kwakanyanya kweabrasive ane yakakosha thermal mechanical kupfeka uye anowanzo kunzi "de-cobalted" mazino.
Iyo inonzi "de-cobalt" inogadzirwa nenzira yechinyakare yekugadzira PDC, uye ipapo pamusoro pedhaimondi yayo inonyudzwa muasidhi yakasimba kuti ibvise cobalt chikamu kuburikidza neasidhi etching process. Kudzika kwekubviswa kwecobalt kunogona kusvika kusvika 200 microns.
Muedzo weheavy-duty wear wakaitwa pamazino maviri akafanana ePDC (rimwe raive raitwa kurapwa kwekubvisa cobalt padhaimondi layer). Mushure mekucheka 5000m yegranite, yakawanikwa kuti chiyero chekupfeka chePDC isina-cobalt-yakabviswa yakatanga kuwedzera zvakanyanya. Kusiyana neizvi, iyo cobalt-yakabviswa PDC yakachengetedza yakagadzikana yekucheka kumhanya ichicheka ingangoita 15000m yedombo.
2. Nzira yekuona yePDC
Kune marudzi maviri enzira dzekuona mazino ePDC, anoti kuyedza kunoparadza uye kuyedza kusiri kuparadza.
1. Kuedza kunoparadza
Aya maedzo anoitirwa kutevedzera downhole mamiriro ezvinhu sezvinobvira kuti aongorore mashandiro ekucheka mazino pasi pemamiriro akadai. Iwo maviri maitiro makuru ekuparadza bvunzo ndeyekupfeka kuramba bvunzo uye maitiro ekupikisa bvunzo.
(1) Pfeka bvunzo dzekuramba
Mhando nhatu dzemidziyo inoshandiswa kuita PDC kupfeka kusamira bvunzo:
A. Vertical lathe (VTL)
Munguva yekuedzwa, tanga wagadzirisa PDC bit kune VTL lathe uye isa dombo sampuli (kazhinji granite) padivi pePDC bit. Wotenderedza sampu yedombo kutenderedza axis yelathe pane imwe kumhanya. Iyo PDC bhiti inocheka mune yedombo sampuli ine chaiyo kudzika. Paunenge uchishandisa granite kuyedza, uku kudzika kwekucheka kunowanzo kushoma 1 mm. Muedzo uyu unogona kunge wakaoma kana kunyorova. Mu "yakaoma VTL kuyedzwa," apo iyo PDC inocheka nepakati pedombo, hapana kutonhora kunoshandiswa; kupisa kwese kwese kunogadzirwa kunopinda muPDC, ichimhanyisa graphitization maitiro edhaimondi. Iyi nzira yekuyedza inoburitsa yakanakisa mhedzisiro kana uchiongorora PDC mabheti pasi pemamiriro ezvinhu anoda yakakwira yekudhirowa kana kukurumidza kutenderera.
Iyo "wet VTL bvunzo" inoona hupenyu hwePDC pasi pemamiriro ekudziya ane mwero nekutonhodza mazino ePDC nemvura kana mweya panguva yekuyedzwa. Naizvozvo, iyo huru yekupfeka sosi yebvunzo iyi kukuya kwedombo sampuli pane kupisa chinhu.
B, horizontal lathe
Muedzo uyu unoitwawo negranite, uye musimboti webvunzo wakangofanana neVTL. Iyo nguva yekuyedza ingori maminetsi mashoma, uye kuvhunduka kwekushisa pakati pegranite nePDC mazino kune mashoma.
Iwo granite test paramita anoshandiswa nePDC giya vatengesi achasiyana. Semuyenzaniso, iwo matest parameters anoshandiswa neSynthetic Corporation neDI Company muUnited States haana kunyatsofanana, asi vanoshandisa iyo gireniti imwe chete pabvunzo dzavo, dombo rakaomarara kusvika pakati pegiredhi repolycrystalline igneous rine porosity shoma uye simba rekumanikidza re190MPa.
C. Abrasion ratio yekuyera chiridzwa
Pasi pemamiriro akatarwa, dhaimondi rePDC rinoshandiswa kucheka silicon carbide kugaya vhiri, uye chiyero cheyero yekupfeka kweguyo vhiri uye chiyero chekupfeka chePDC chinotorwa seyekupfeka index yePDC, inodaidzwa kuti wear ratio.
(2) Impact resistance test
Iyo nzira yekuongorora maitiro inosanganisira kuisa mazino ePDC pakona ye15-25 madhigirii uyezve kudonhedza chinhu kubva kune imwe nzvimbo kureba kuti irove dhaimondi layer paPDC mazino akatwasuka. Huremu uye kureba kwechinhu chinodonha chinoratidza simba resimba rinowanikwa nezino rekuyedza, iro rinogona kuwedzera zvishoma nezvishoma kusvika ku100 joules. Zino rega rega rinogona kukanganiswa 3-7 nguva kusvika risisakwanise kuongororwa zvakare. Kazhinji, zvingangoita gumi masampuli emhando yega yega yezino anoedzwa padanho rega rega resimba. Sezvo paine huwandu mukupokana kwemeno kuti aite, mhedzisiro yebvunzo padanho rega rega resimba ndiyo avhareji nzvimbo yedhaimondi spalling mushure mekuita kune rimwe nerimwe zino.
2. Kuedza kusina kuparadza
Iyo inonyanya kushandiswa isiri yekuparadza nzira yekuyedza (kunze kwekuona uye microscope kuongorora) ndeye ultrasonic scanning (Cscan).
C yekuongorora tekinoroji inogona kuona zvirema zvidiki uye kuona nzvimbo uye saizi yehurema. Paunenge uchiita bvunzo iyi, tanga isa PDC zino mutangi remvura, uye wozotarisa ne ultrasonic probe;
Chinyorwa ichi chakadhindwa kubva ku“International Metalworking Network“
Nguva yekutumira: Mar-21-2025
