labarai

Lu'u-lu'u na roba

Ana amfani da grit na lu'u-lu'u don kwatanta ƙananan hatsi (≈0.00004 in.) na lu'u-lu'u na roba da aka yi amfani da shi azaman maɓalli na albarkatun ƙasa don masu yankan PDC.Dangane da sinadarai da kaddarorin, lu'u-lu'u da aka yi da mutum yayi kama da lu'u-lu'u na halitta.Yin grit lu'u-lu'u ya ƙunshi tsari mai sauƙi na sinadarai: carbon na yau da kullun yana dumama ƙarƙashin matsanancin matsi da zafin jiki.A aikace, duk da haka, yin lu'u-lu'u ba shi da sauƙi.

Lu'ulu'u na lu'u-lu'u ɗaya ɗaya wanda ke ƙunshe a cikin lu'u-lu'u suna da mabanbanta juna.Wannan yana sa kayan ya yi ƙarfi, kaifi, kuma, saboda taurin lu'u-lu'u da ke ƙunshe, yana jure juriya.A gaskiya ma, tsarin bazuwar da aka samu a cikin lu'u-lu'u na roba mai haɗin gwiwa yana yin aiki mafi kyau a shear fiye da lu'u-lu'u na halitta, saboda lu'u-lu'u na halitta sune lu'ulu'u masu siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar siffar , girman .

Gilashin lu'u-lu'u ba shi da kwanciyar hankali a yanayin zafi sama da lu'u-lu'u na halitta, duk da haka.Saboda ƙaƙƙarfan ƙarfe wanda aka makale a cikin tsarin grit yana da ƙimar haɓakar zafi sama da lu'u-lu'u, haɓaka banbance-banbance yana sanya haɗin lu'u-lu'u zuwa lu'u-lu'u a ƙarƙashin shear kuma, idan lodi ya isa sosai, yana haifar da gazawa.Idan shaidu sun kasa, lu'u-lu'u suna da sauri asara, don haka PDC ya rasa taurinsa da kaifi kuma ya zama mara amfani.Don hana irin wannan gazawar, dole ne a sanyaya masu yankan PDC daidai lokacin hakowa.

Teburan lu'u-lu'u

Don kera tebur ɗin lu'u-lu'u, an haɗa grit ɗin lu'u-lu'u tare da tungsten carbide da ɗaure ƙarfe don samar da shimfida mai wadataccen lu'u-lu'u.Suna da siffa irin wafer, kuma yakamata a sanya su cikin kauri gwargwadon tsari, saboda girman lu'u-lu'u yana ƙara lalacewa.Teburan lu'u-lu'u mafi inganci sune ≈2 zuwa 4 mm, kuma ci gaban fasaha zai haɓaka kauri na teburin lu'u-lu'u.Tungsten carbide substrates yawanci ≈0.5 in. tsayi kuma suna da sifar giciye iri ɗaya da girma kamar teburin lu'u-lu'u.Sassan guda biyu, teburin lu'u-lu'u da ƙasa, suna yin abin yanka (Fig. 4).

Ƙirƙirar PDC zuwa sifofi masu amfani don masu yankan ya haɗa da sanya grit lu'u-lu'u, tare da madaidaicin sa, a cikin jirgin ruwa mai matsa lamba sannan kuma yin sintiri a babban zafi da matsa lamba.

Ba za a iya barin masu yankan PDC su wuce yanayin zafi na 1,382°F [750°C].Zafin da ya wuce kima yana haifar da lalacewa cikin sauri, saboda bambancin haɓakar zafi tsakanin ɗaure da lu'u-lu'u yana ƙoƙarin karya lu'ulu'u masu girma da yawa a cikin teburin lu'u-lu'u.Ƙarfin haɗin gwiwa tsakanin teburin lu'u-lu'u da kuma tungsten carbide substrate suma suna cikin haɗari ta hanyar haɓaka yanayin zafi daban-daban.