Ukukhetha Kahle Kwezingcezu Ze-PDC Zezimayini Zamalahle
Ukwakhiwa kwemigodi kuyindlela yobuchwepheshe esetshenziswa kakhulu yokulawula igesi, ukuvimbela umonakalo wamanzi, kanye nokuhlola umhlaba ezimayini zamalahle, okudlala indima ebalulekile ekuqinisekiseni ukuphepha nokusebenza kahle kokukhiqizwa kwamalahle. E-China, amashumi ezigidi zamamitha emigodi yokumba enziwa minyaka yonke ezimayini zamalahle. Inqubo yokwakha idinga ukusekelwa kwemishini yokumba enjengama-drill, amapayipi okubhoboza, nezinsimbi zokubhoboza. Phakathi kwazo, ukubhoboza kungamathuluzi abalulekile okwenza izimbobo eziqondile kanye namatshe aphukayo.
Ishidi le-Poly crystalline diamond composite sheet (PDC) lisetshenziswa kakhulu ezingxenyeni zokumba izimayini ngenxa yokumelana nokuguga okukhethekile kanye nokuqina komthelela okuncomekayo.Idatha ye-PDCbabonisa ubude besikhathi sokumba kanye nokusebenza kahle okuphakeme kokungena lapho beqashwe ematsheni aqinile naphansi, ngaleyo ndlela kuletha izinzuzo ezinkulu zezomnotho emisebenzini yokumba imayini yamalahle. Uma kuqhathaniswa nokumba uwoyela, ukumba amalahle kunezici zobuchwepheshe zokungabizi, ukonga isikhathi, kanye nezimfuneko eziklanywe ngokucindezela ngokweqile i-DC jikelele. ngenkani.
Izinselelo zamanje ezibhekene nezimayiniIdatha ye-PDCkufaka phakathi: ①Umkhawulo wokungena wezingcezu ze-PDC zezimayini uphansi ngokuqhathaniswa, nenqwaba yabakhiqizi abahlinzeka ngamaleveli ahlukahlukene ekhwalithi. ②Ukusetshenziswa nezimfuneko zokumba ngaphansi komhlaba ezimayini zamalahle zibonisa ukungafani okusobala, kuyilapho ukuhlukaniswa kwezingxenye ze-PDC zezimayini kuyinkimbinkimbi futhi kuhlukahlukene. Ngaphezu kwalokho, kunokuntuleka kokucaciswa kokukhetha okuhlelekile nokuhluzekile enqubweni yokusetshenziswa elandelayo.③Ngokwenyuka kokwanda kohlaka oluqinile ezimayini zamalahle, izingcezu ezivamile ze-PDC zezimayini ziyehluleka ukuhlangabezana nezimfuneko zokwakha zokumba kahle endaweni, okuholela ezimweni zenqubekelaphambili ehamba kancane noma ngisho nokuntuleka okuphelele kwezimo eziqinile zokwakhiwa kwesakhiwo esiqinile.④ ukumba izinqubo zabasebenzi bokwakha ngezinye izikhathi kungaba nzima.
Ukuze kuthuthukiswe ukusebenza ngempumelelo kwezimayiniIdatha ye-PDC, leli phepha linikeza ukuhlaziywa okuphelele kwezindlela zokwehluleka okuyinhloko futhi liphenya izimbangela eziyisisekelo zefomu ngalinye lokwehluleka. Ukwengeza, kuhlongozwa izincomo ezisebenzayo zokukhetha ngobuhlakani kanye nokusetshenziswa ngokucophelela kwalezi zingcezu.
1.Ukuhlaziywa Kwefomu kanye nezimbangela zokuhluleka kwe-PDC Bit Emayini
Okwamanje, izingxenye zezingcezu zezimayini ze-PDC ngokuyinhloko zihlanganisa umzimba omncane, izisiki ze-PDC, ama-gauge alloy, nezinye izingxenye njengoba kuboniswe kuMfanekiso 1. Izisiki ze-PDC nama-gauge alloy zibraze phezu komzimba omncane ukuze kuqinisekiswe ukunamathiselwe kwazo okuvikelekile. Ngesikhathi sokumba okuvamile, i-drill rod idlulisa i-torque kanye nokucindezela kokuphakelayo phansi kwembobo lapho ihlangana khona ne-drill bit. Inqubo yokusika amadwala yenziwa ngokusebenzisa abasiki be-PDC endaweni yokubhoboza. Ukwengeza, ama-gauge alloys avikela ukuguga ngokweqile ngokuvikela ubuqotho be-circumferential bomzimba omncane. Kodwa-ke, kufanele kuqashelwe ukuthi izici ezihlukahlukene ezifana namandla ayinkimbinkimbi asetshenziswa ku-cutter phansi emgodini ngesikhathi sokusika idwala nge-PDC bit, izinguquko ezicini zokwakheka, ukukhethwa kwamasu okwakha kanye nemishini, ukusebenza kahle kwabasebenzi abahilelekile emisebenzini yokwakha kanye nezinyathelo zokulawula ikhwalithi zezingcezu ngokwazo zingaba nomthelela omkhulu ekusebenzeni kwesicelo okuholela ezinhlotsheni ezihlukahlukene zokwehluleka kwalezi zingcezu. Ngophenyo olwenziwa ezindaweni zokumba imayini yamalahle, sifinyeze futhi sahlaziya izindlela ezihlukene zokwehluleka kanye nezimbangela eziyinhloko ezihlobeneIdatha ye-PDC.
1.1 Ukwehluleka kwe-PDC cutter kwenzeka lapho i-PDC ifakwa ngaphansi kwezinga lokushisa eliphezulu kanye nezimo zengcindezi ephezulu. Ishidi eliyinhlanganisela liqukethe izingxenye ezimbili eziyinhloko: ungqimba lwedayimane kanye ne-matrix ye-carbide, njengoba kubonisiwe kuMfanekiso 2.
Izindlela zokwehluleka eziyinhloko zabasiki be-PDC zifaka ukugqokwa okuvamile, ukugqabhuka, ukuwa kwe-blade, kanye ne-delamination.
(1) Ukuguga okuvamile
Isenzakalo sokugqokwa okuvamile kuwuhlobo lomonakalo ovamile owenzeka kubasiki be-PDC ngesikhathi sokusika amadwala, okubonakaliswa ngokuyinhloko ukulahlekelwa okuphawulekayo kokugaywa kwedayimane kukho kokubili ungqimba lwedayimane kanye ne-matrix kasimende ye-carbide yabasiki, ngaphandle kwemikhondo esobala yokuqhekeka endaweni yokugaya.
(2) I-chip drop
Isenzakalo sokwehla kwe-chip senzeka lapho abasiki be-PDC besuka emzimbeni omncane, okuholela ekwehlulekeni kancane. Isici esigqame kakhulu ukuhlukaniswa okuphelele kwabasiki be-PDC emzimbeni omncane, kungabikho izinsalela ze-alloy ezitholakala emgodini lapho ukushisela phakathi kwe-bit body kanye nabasiki be-PDC kwenzeka.
Izici eziyinhloko ezinomthelela ekwehleni kwefilimu ewayo:
① Izinga lokushisa eliphakeme ngaphansi kwe-borehole liholela ezinseleleni kubuchwepheshe bokwakha bokumba okomile noma ukwakhiwa kwepulaki lamanzi phakathi nenqubo yokumba, kanti futhi kuvimbela ukupholisa okufika ngesikhathi kwabasiki be-PDC ku-drill ngesikhathi sokusika amatshe ajikelezayo ngesivinini esikhulu. Ngenxa yalokho, kukhona ukwenyuka okuphawulekayo kwezinga lokushisa phansi kwembobo, okungadlula izinga lokushisa elibucayi le-solder futhi kubangele ukuncibilika kwe-solder kanye ne-detachment elandelayo yabasiki be-PDC.
② Ukulawulwa kwenqubo yokubhoboza ukushisela akuqinile ngokwanele. Enkambweni yokushisela, kukhona ukuntuleka kokuhlanza okufanele ngaphambi kokushisela, ama-welds angalungile noma ukulawulwa kwegesi ephumayo enganele, kanye nokushisa okungenangqondo kokugcina ukushisa noma isikhathi esanele emva kokushisela, konke okungase kubangele ukuxoshwa kancane. Ngaphandle kokufuna abakhiqizi ukuthi balawule ngokuqinile inqubo yokukhiqiza (ikakhulukazi inqubo ye-PDC yokusika i-welding) ukuze kuqinisekiswe ama-welds aphelele futhi aqinile, kuyadingeka futhi ukucacisa inqubo yokwakhiwa kokumba ngokukhetha ukubhoboza amanzi noma nini lapho kungenzeka futhi ugweme ukwakhiwa kokumba okomile. Ukuze kubhojwe imbobo ejulile, kufanele kuqinisekiswe ukuthi amanzi abuya ngaphambi kokwengeza ukumba induku. Ukwengeza, isikhathi ngasinye ngaphambi kokufaka i-drill ngaphansi komgodi, kubalulekile ukuhlola ukuthi azikho yini izithiyo ukuze ugweme ukuvinjelwa.
(3) Ukuphuka kweblade
Ukuphuka kongqimba lwedayimane kubasiki be-PDC kumelele indlela evame kakhulu yokwehlulekaIdatha ye-PDC. Isici esiphawulekayo sale modi yokwehluleka ukugqabuka kwendawo kwesendlalelo sedayimane, ngezinye izikhathi okuholela ekuphukeni kwaso kanye kanye eduze kwe-carbide matrix.
Izimbangela eziyinhloko zokuqhekeka kwe-PDC bit:
① Umsiki okhethwe ngokusekelwe ezicini ezingokwemvelo zesisiki se-PDC sibonisa ukumelana nomthelela ophansi. Amandla ahlanganisiwe e-tungsten carbide (WC) kanye ne-diamond micro-powder ayanele, okwenza kube lula ukwehluleka ngaphansi kwengcindezi yokuhlukana kwamadwala;
② Izinto ezihlobene nenqubo yokwakha zibonisa ukuthi ingcindezi yokwakha endaweni iphezulu kakhulu. Ingcindezi ekhishwa i-PDC cutter engxenyeni yebhithi yeqa kakhulu umkhawulo wokucindezela komsiki, okuholela ekuqhekekeni kongqimba lwedayimane kanye nokuwa okulandelanayo konqenqema lokusika.
③ Izinto ezihlobene nokwakheka okuyinkimbinkimbi zibonisa ukuthi ngesikhathi sokwakhiwa kwezakhiwo eziqinile, eziphukile, umthwalo womthelela kubasiki be-PDC udlula ukuqina komthelela wabo, okungase kuholele ekuweni konqenqema lokusika.
④ Idizayini ye-engeli yokusika ayinele, njengoba ingathobeli isimiso sokuthi ukwakheka okuqinile kudinga i-engeli yokusika enkulu. Ekwakhiweni kokwakheka okunzima, i-angle encane yokusika ingabangela amandla amaningi ku-PCC cutter, ekugcineni okuholela ekuweni komkhawulo wokusika.
⑤ Ezinye izici zibonisa ukuthi ukuhlelwa kwamabhawudi asekelayo nezintambo okusetshenzwa kulengwa kuzo emigwaqweni engaphansi komhlaba kwenza kube lula ukuthi i-drill bit idilike lapho ihlangabezana nalezi zinto. Ukuze uvimbele ukwehluleka kancane, kubalulekile ukuthi ungagcini nje ngokunamathela ngokuqinile emikhawulweni yenqubo echazwe encwadini yeziqondiso zokubhola kodwa futhi nokuklama nokukhetha umshini wokubhola ngokusekelwe ezimweni zokubunjwa. Ikakhulukazi, lapho ubhoboza ukwakheka okuqinile, kuyatuseka ukwandisa i-engeli yokusika yebhithi ngendlela efanele, unciphise ulaka lwalo, futhi uthuthukise ukuvikeleka kwebhithi. Ukwengeza, ukukhetha abasiki be-PDC abanokuqina komthelela okuphezulu kuyanconywa lapho ubhoboza ukwakheka okuqhekekile okuqinile noma ulungisa ukwakheka kwangaphandle kongqimba lwedayimane lomsiki ukuze kuthuthukiswe ukuqina komthelela; isibonelo, abasiki be-PDC abagobile ngokuvamile babonisa ukumelana nomthelela ongcono kunezinhlobo eziyisicaba. Ngaphezu kwalokho, ukuhlelwa okunengqondo kwezimbobo ngesikhathi sokwakha kufanele kusetshenziswe ukuze kugwenywe ukubhobolwa kumabhawudi nezintambo okusetshenzwa kulengwa kuzo.
(4) Ukuncipha
I-Delamination ibhekisela ekuhlukaniseni ungqimba lwedayimane olusuka ku-matrix ye-carbide enosimende kumashidi ayinhlanganisela ye-PDC, njengoba kubonisiwe kuMfanekiso 3.
Imbangela eyinhloko ye-delamination ongqimbeni lwedayimane lwabasiki be-PDC ukucindezelwa okuyinsalela okukhulu okukhona phakathi kongqimba lwedayimane kanye ne-matrix ye-carbide enosimende, okuhambisana nomehluko omkhulu kuma-coefficients awo okwanda okushisayo. Ngesikhathi sokusika idwala, ungqimba lwedayimane kanye ne-carbide matrix enosimende kuba nokufinyela okungavumelaniyo ngenxa yengcindezi yokushisa edalwa ukushisa okungqubuzanayo nokupholisa okuvela emanzini okugeza. Umphumela womthwalo womthelela kanye nokucindezeleka okuyinsalela kuholela ekuxebukeni kongqimba lwedayimane ku-matrix ye-carbide, ekugcineni okuholele ekuhlulekeni kwe-drill bit. Ukunciphisa i-delamination, kubalulekile ukukhetha izinto ezifanele zokubopha kanye nokucubungula ubuchwepheshe obubhekana nengcindezi eyinsalela phakathi kwalezi zingxenye ezimbili ngesikhathi sokukhiqiza. Ukwengeza, ukuklama ukwakheka kwesixhumi esibonakalayo esisha se-matrix kungathuthukisa izakhiwo zokubopha phakathi kongqimba lwedayimane kanye ne-matrix ye-carbide esimende.
1.2 Ukuhluleka komzimba wokubhoboza kubonakala ngokuyinhloko ukuphuka kwe-blade emzimbeni wokubhoboza, njengoba kuboniswe kuMfanekiso 4.
Ukuphuka kwe-blade yomzimba omncane kwenzeka kakhulu emzimbeni futhi insimbi yomzimba wensimbi ayivamile ukwenzeka. Izizathu zokuphuka kweblade yomzimba omncane zimi kanje: ① Ukushaya ingxenyana ye-bit body lapho uqaqa umzimba ngoba umqhele womzimba omncane ugonywa inqubo ye-powder metallurgy ngesikhathi esisodwa. uma kuqhathaniswa nebhithi elijwayelekile lomzimba wensimbi. ingxenye encane yomzimba inokumelana nokuguga okuphezulu. kodwa ukuqina kwempahla yomzimba kuyancishiswa ngokufanayo futhi kulula ukuphula i-blade yomzimba omncane lapho ukhulula umzimba omncane; ② Ukulawulwa kwenqubo ye-bit sintering akuqinile. futhi umzimba we-sintered bit uwukugxila futhi impushana yensimbi iyehluleka ukwenza ingxubevange.Ukuze kugwenywe ukuphuka kwe-blade. umsebenzisi ubenamathuluzi okusebenzisa kangcono anjengephinifa lamazinyo ukuze asize iketango lapho eqaqa i-drill. ukuze ugweme ukugoqa i-blade; Okwesibili. abakhiqizi kufanele balawule ngokuqinile ikhwalithi ye-sintered body. hhayi kuphela ukulawula ngokuqinile inqubo ye-sintering. kodwa futhi nokuqapha impushana yensimbi ngezikhathi ezithile ukuze kuqinisekiswe ukuthi impushana ihlangabezana nezidingo zenqubo.
2. Idizayini Ethuthukisiwe kanye Nokukhethwa Okuphusile Kwezimayini ze-PDC Bit
2.1 Idizayini yokuthuthukisa ye-drill bit
(1) Ngefomu lokuhluleka kwebhithi, kuyadingeka ukukhulisa ukwakheka kwayo kusuka kumklamo wokubhoboza. Imingcele yokuklama eyinhloko ye-PDC bit ihlanganisa ukusika i-Angle α. I-engeli yohlangothi β. i-azimuth engela γ. njll. U-γ ubhekisela ku-engeli phakathi komugqa wereferensi wokumayo wamazinyo e-PDC kanye nomugqa omaphakathi webhithi. U-α ubhekisela ku-Engeli phakathi komugqa wereferensi wokuma kwezinyo le-PDC kanye nendiza esebenzayo yomsiki. njengoba kuboniswe kuMfanekiso 5. u-β ubhekisela ku-Engeli phakathi kwendiza phakathi nendawo emaphakathi kanye nomugqa omaphakathi webhithi kanye nendiza yokusebenza yomsiki. njengoba kuboniswe kuMfanekiso 6. Ucwaningo lokuqala kanye nokuhlaziywa kwesicelo esibanzi kubonisa ukuthi i-Angle yokusika kanye ne-Angle eseceleni yabasiki be-PDC ingaba nomthelela ngqo empilweni nokusebenza kahle kokubhola kwebhithi. futhi kuyadingeka ukwandisa ukuklama kwebhithi ngokusho kokwakheka okuhlukene kokumba. I-Cutting Angle design izothinta kakhulu ukusebenza kahle kokumba. noma ngisho kungabikho izithombe nhlobo; Uma i-engeli yokusika incane kakhulu. i-PDC cutting edge ijwayele ukuphuka nezinye izenzakalo. Ngakho-ke. umklamo wokubhoboza kufanele ucatshangelwe ngokugcwele lapho kukhethwa isikimu sepharamitha ngokukhetha i-Angle yokusika emaphakathi kanye ne-Angle eseceleni kunokwakheka okungahleliwe.
(2) Ngaphezu kokuthuthukisa i-engeli yokusika yebhithi, kubalulekile futhi nokwandisa abasiki be-PDC. Izinga labasiki be-PDC lithonya kakhulu izingcezu ze-PDC zezimayini, njengoba linquma ngokuqondile ukusebenza kwazo kokusika kanye neminyaka yokuphila. Isici esibalulekile ekuthuthukiseni ikhwalithi ye-PDC ukuqedwa kwengcindezi eyinsalela ekuxhumaneni kwesibopho phakathi kongqimba lwedayimane kanye ne-matrix ye-carbide esimende. Ucwaningo lubonisa ukuthi ukucindezelwa okukhulu kubasiki be-PDC abanesakhiwo soxhumano oluhleliwe kugxilwe eduze kwezinhlangothi zombili zalesi sixhumi esibonakalayo, ngokucindezela okuphezulu nokushear okwenzeka emaphethelweni ongqimba lwedayimane. Ukuba khona kwengcindezi eqinile kungaholela ekuqhekekeni okungavamile ku-PDC, kuyilapho ukucindezeleka kwe-shear kusebenza njengembangela eyinhloko ye-delamination kubasiki be-PDC.
(3) Ngaphezu kokuqeda ingcindezi eyinsalela kubasiki be-PDC, ukwelashwa kwesibili kungathuthukisa ikhwalithi yabo. Njengamanje, izindlela zokwelapha eziyisisekelo zifaka ukugaya okungaphezulu kwedayimane, i-edge chamfering, kanye nemishini emise okwezimo. Ukukhethwa kwabasiki be-PDC kungenziwa ngokugcwele ngokusekelwe ezimweni zangempela zokusebenza.
2.2 Ukukhetha okunengqondo kwezingcezu zokubhoboza
Njengamanje, izingcezu ze-PDC ezisetshenziswa emisebenzini yokumba imigodi ephansi kuzo zonke izindawo zezimayini zibandakanya ikakhulukazi umklamo we-concave onamaphiko amathathu. Kodwa-ke, ukukhethwa kwalezi zingcezu kuvame ukukhawulelwa futhi akunayo ukuhlukaniswa, okuholela endleleni yokulinganisa usayizi owodwa engabukeli ngokwanele izidingo ezithile zezigaba ezahlukene. Lokhu kuyinkinga ikakhulukazi ngaphansi kwezimo eziyinkimbinkimbi zokwakheka, lapho izingcezu ezivamile ze-concave zizabalazela ukuletha ukusebenza okugculisayo, okuholela ekuphileni okuncane okufushanisiwe kanye nokunciphisa ukusebenza kahle kokumba. Ukungasebenzi okunjalo akugcini nje ngokukhuphula izindleko zokukhiqiza kodwa kungase futhi kuphazamise amashejuli okwakha futhi kubangele ukulahlekelwa okukhulu kwezomnotho. Ngakho-ke, kubalulekile ukukhetha izingcezu zokubhola ezifanele ezihambisana nezimo ezihlukene zokwakheka.
Izingcezu ze-PDC zezimayini zingahlukaniswa zibe izinhlobo ezimbili eziyinhloko ngokusekelwe kokubalulekile komzimba omncane: uhlobo lwensimbi nohlobo lwesondo. Imizimba yensimbi yohlobo lwensimbi icutshungulwa ngokuyinhloko ngezindlela zemishini, ihlinzeka ngokuqina okuhle okuyenza ifanelekele imisebenzi evamile yokumba yokubumba. Ngokuphambene, imizimba yebhithi yohlobo lwamasondo ifakwe emanzini kusetshenziswa izinqubo ze-powder metallurgy, enikeza ukumelana nokugqokwa okuphezulu okulungele ukumba amatshe aqinile noma imisebenzi yokumba enwetshiwe. Ukwengeza, izingcezu zokubhoboza zingahlukaniswa zibe izakhiwo ezihlukahlukene, okuhlanganisa i-concave yangaphakathi, ikhoneni le-arc, iphansi eliyisicaba, i-scraper, nezinye njengoba kubonisiwe kuMfanekiso 7. ①Isakhiwo se-concave bit ye-concave bit sithuthukisa imiphumela yokuqondisa ngesikhathi sokwakhiwa kokwakheka okujwayelekile; ②Ukuhlelwa kwamazinyo ahlakazekile kwe-arc bit kubangela ukuminyana kwamazinyo okuphezulu kanye nokusebenza kahle kokumba okuthuthukisiwe lapho usebenza nge-medium-hard strata nangaphezulu; ③Umumo wodebe lwebhithi eliphansi eliphansi licishe libe sicaba, elilola imiphetho yalo esemaceleni ukuze kube lula ukutsheka—lo mklamo usetshenziswa kakhulu ekubhobolweni okuqondisayo; ④Ibhithi ye-scraper ivamise ukufaka ukwakheka okucijile enikeza ulaka olukhulu futhi isetshenziswa kakhulu ekuhlanganiseni okuthambile noma ukwakhiwa komthungo wamalahle.
Izingcezu zamanje ze-PDC zezimayini zifingqiwe futhi zahlelwa, kanye nenqubo yokukhetha yamabhithi e-PDC ngaphansi kwezimo ezihlukahlukene zokusebenza nokubunjwa, njengoba zethulwe kuThebula 1 ukuze kubhekiselwe kuzo.
3. Ukusetshenziswa kweMining PDC Bit Precautions
Ngaphezu kokukhetha ngokucophelela ama-drill bits, kubalulekile ngokufanayo ukusebenzisa kahle lawa mathuluzi. Uma kubhekwa izimo zokwakha eziyinselele ezimayini zamalahle, abasebenzi bavamise ukuzabalaza ukunamathela ngokuqinile kuzinkombandlela zokusebenza ze-PDC kancane, okuholela ezikhathini eziningi zokuhluleka kancane ngenxa yokuphatha ngendlela engafanele. Emzamweni wokuthuthukisa ukusebenza kahle kokumba, ezinye izindawo zezimayini zingase zikhulise ngokungakhethi isisindo phakathi nokusebenza, okuholela ekuhlulekeni kwebhithi ngaphambi kwesikhathi. Ukusebenzisa kahle amabhithi e-PDC kungathuthukisa ukusebenza kwawo futhi kunciphise izindleko zokukhiqiza. Kufanele kuqashelwe lokhu okulandelayo lapho usebenzisa amabhithi e-PDC:
(1) Naka ubudlelwano bokugreda phakathi kwebhithi le-PDC nethuluzi lokubhoboza, uqinisekise ukuthi ipayipi elikhulu lokubhoboza alifani nepayipi lokubhoboza elinobubanzi obuncane kakhulu, futhi ipayipi lokubhoboza elinobubanzi obuncane alifani nebhilidi elikhulu lokubhoboza.
(2) Indlela elungile iwukusebenzisa umshini wokubhoboza imbobo okhethekile noma umgodi omdala wokwakha isidleke, kuyilapho uqinisekisa ukuthi inqubo yokumba igwema indawo yamabhawudi aseceleni komzila, izintambo okusetshenzwa kulengwa kuzo, nezinye izithiyo ezifanayo.
(3) Lapho uqhuba imisebenzi yokumba, kubalulekile ukulawula ukucindezela kokuphakelayo ukuze kuvinjelwe izingozi ezibangelwa ukucindezela okukhulu ngaphakathi komgodi.
(4) Sicela usebenzise indlela yokumba amanzi ahlanzekile, ugweme ukubhoboza okomile noma ukubhola komoya ocindezelayo. Ngaphambi kokuqala imisebenzi yokumba umfutho, qinisekisa ukuhamba kahle kwamanzi ngaphakathi kwembobo ukuvimbela izigameko zokusha okungase kube khona endaweni yawo.
(5) Lapho ukhipha ibhithi, qiniseka ukuthi ugwema ukubopha noma ukushaya i-PDC cutter. Ukwengeza, qaphela ukuthi ungashayi i-body blade ye-bit.
4. Isiphetho
Ukumbiwa kwamalahle ngendlela ephephile nephumelelayo bekulokhu kuyindikimba ekhuthazwa imboni yamalahle. Ukusebenzisa ngempumelelo izingcezu ze-PDC emisebenzini yokumba ngaphansi komhlaba ezimayini zamalahle kubaluleke kakhulu. Leli phepha lihlaziya izindlela zokwehluleka kwezingcezu ze-PDC zezimayini, licacisa izimbangela eziyinhloko ezingemuva kwamafomu ahlukene okuhluleka. Iphakamisa amasu angcono kakhulu okuklama nokukhetha izingcezu ngaphansi kwezimo zokusebenza ezahlukene kanye nokwakheka komhlaba, kuyilapho ifinyeza izinyathelo zokuphepha zokusetshenziswa kwazo, ngaleyo ndlela inikeze ireferensi yokukhethwa okuthuthukisiwe kanye nokusetshenziswa kwezingcezu ze-PDC zezimayini. Ukukhethwa okuhlakaniphile nokusetshenziswa ngendlela efanele kwezingcezu ze-PDC zezimayini kungakhulisa ukusebenza kahle kwazo, kunciphise ukumosheka kwezinsiza, futhi kuthuthukise ukuphepha, ukusebenza kahle, kanye nezinqubo ezinobungani nemvelo ezimayini zamalahle.