Te kakahu wera me te tango konukura o te PDC

I. Te kakahu wera me te tango konupora i te PDC

I roto i te tukanga sintering pēhanga teitei o te PDC, ka mahi te cobalt hei whakakorikori hei whakatairanga i te whakakotahitanga tika o te taimana me te taimana, ka hanga i te paparanga taimana me te matrix tungsten carbide kia kotahi, ka hua ake he niho tapahi PDC e tika ana mo te keri whenua o te mara hinu me te pakari teitei me te ātete kakahu pai.

He iti noa te ātete wera o ngā taimana. I raro i te pēhanga hau, ka taea e te mata o te taimana te huri i ngā pāmahana tata ki te 900℃, neke atu rānei. I te wā e whakamahia ana, ka memeha haere ngā PDC tuku iho i te 750℃. Ina keri ana i roto i ngā paparanga toka mārō me te kirikiri, ka taea e ngā PDC te eke ki tēnei pāmahana nā te wera waku, ā, ka taea e te pāmahana inamata (arā, te pāmahana ā-rohe i te taumata moroiti) te teitei ake, neke atu i te ira rewa o te cobalt (1495°C).

Ki te whakatauritea ki te taimana parakore, nā te mea kei roto i te cobalt, ka huri te taimana hei karāpiti i ngā pāmahana iti iho. Nō reira, ko te pakaru o te taimana nā te karāpiti i puta mai i te wera waku ā-rohe. Hei tāpiri, he nui ake te tauwehenga whānui wera o te cobalt i tō te taimana, nō reira i te wā e whakamahana ana, ka taea te whakararu i te hononga i waenga i ngā maramara taimana e te whānui o te cobalt.

I te tau 1983, e rua ngā kairangahau i whakahaere i te maimoatanga tango taimana ki te mata o ngā paparanga taimana PDC paerewa, ā, i tino whakarei ake i te mahi a ngā niho PDC. Heoi, kāore i arohia tēnei mea hou. I muri i te tau 2000, me te māramatanga hohonu ake ki ngā paparanga taimana PDC, ka tīmata ngā kaiwhakarato wiri ki te whakamahi i tēnei hangarau ki ngā niho PDC e whakamahia ana i roto i te keri toka. Ko ngā niho e rongoatia ana ki tēnei tikanga he pai mō ngā hanganga tino koi me te nui o te pakaru miihini wera, ā, e kiia ana ko ngā niho "de-cobalted".

Ko te mea e kiia nei ko te "de-cobalt" ka hangaia i te tikanga tuku iho hei hanga PDC, kātahi ka rumakina te mata o tōna paparanga taimana ki roto i te waikawa kaha hei tango i te wāhanga cobalt mā te tukanga keri waikawa. Ka taea e te hohonutanga o te tango cobalt te tae ki te 200 microns.

I whakahaerehia he whakamātautau kakahu taumaha ki runga i ngā niho PDC e rua rite tonu (ko tētahi o ēnei kua pangia ki te maimoatanga tango cobalt i runga i te mata o te paparanga taimana). I muri i te tapahi i te 5000m o te karāhe, i kitea ka tīmata te piki haere o te tere kakahu o te PDC kāore i tangohia te cobalt. He rerekē, i mau tonu te tere tapahi pumau o te PDC i tangohia te cobalt i te mea e tapahi ana i te 15000m o te toka.

2. Tikanga kimi o te PDC

E rua ngā momo tikanga hei kimi i ngā niho PDC, arā, ko te whakamātautau whakangaro me te whakamātautau kore-whakangaro.

1. Whakamātautau whakangaro

Ko te whāinga o ēnei whakamātautau he whakatauira i ngā āhuatanga o raro i te poka kia tino pono ai te aromatawai i te mahi a te tapahi niho i raro i ēnei āhuatanga. Ko ngā momo matua e rua o te whakamātautau whakangaro ko ngā whakamātautau ātete kakahu me ngā whakamātautau ātete pānga.

(1) Whakamātautau ātete kakahu

E toru ngā momo taputapu e whakamahia ana hei whakahaere i ngā whakamātautau ātete kakahu PDC:

A. Mīhini Whakairo Poutū (VTL)

I te wā whakamātautau, tuatahi whakapirihia te mata PDC ki te mīhini hurihuri VTL, ka whakanoho i tētahi tauira toka (ko te karāhe te tikanga) ki te taha o te mata PDC. Kātahi ka hurihia te tauira toka huri noa i te tuaka mīhini hurihuri i tētahi tere. Ka tapahia e te mata PDC ki roto i te tauira toka me tētahi hohonutanga motuhake. Ina whakamahia te karāhe hei whakamātautau, ko tēnei hohonutanga tapahi he iti iho i te 1 mm. Ka taea tēnei whakamātautau te maroke, te mākū rānei. I roto i te "whakamātautau VTL maroke," ina tapahia e te mata PDC mā roto i te toka, kāore he whakamatao e whakamahia; ka uru katoa te wera waku e puta ana ki te PDC, ka tere ake te tukanga whakakāwhata o te taimana. Ka puta he hua pai i tēnei tikanga whakamātautau ina aromatawaihia ngā mata PDC i raro i ngā āhuatanga e hiahia ana ki te pēhanga keri teitei, te tere hurihuri teitei rānei.

Mā te "whakamātautau VTL mākū" ka kitea te roa o te ora o te PDC i raro i ngā āhuatanga whakamahana ngawari mā te whakamatao i ngā niho PDC ki te wai, ki te hau rānei i te wā whakamātautau. Nō reira, ko te pūtake matua o te pakaru o tēnei whakamātautau ko te hurihanga o te tauira toka, kaua ko te take whakamahana.

B, mīhini hurihuri whakapae

Ka whakahaerehia hoki tēnei whakamātautau me te karāhe, ā, he rite tonu te kaupapa o te whakamātautau ki te VTL. He torutoru meneti noa iho te roa o te whakamātautau, ā, he iti noa te ru wera i waenga i te karāhe me ngā niho PDC.

Ka rerekē ngā tawhā whakamātautau karāhe e whakamahia ana e ngā kaiwhakarato taputapu PDC. Hei tauira, kāore ngā tawhā whakamātautau e whakamahia ana e Synthetic Corporation me DI Company i te United States i tino ōrite, engari he rite tonu te rauemi karāhe e whakamahia ana mō ā rātou whakamātautau, he toka mura polycrystalline matotoru ki te reo, he iti noa te porosity me te kaha pēhi o te 190MPa.

C. Taputapu ine ōwehenga pakū

I raro i ngā tikanga kua tohua, ka whakamahia te paparanga taimana o te PDC hei kuti i te wira huri karawiti silicon, ā, ko te ōwehenga o te tere kakahu o te wira huri me te tere kakahu o te PDC ka tangohia hei taupū kakahu o te PDC, e kiia nei ko te ōwehenga kakahu.

(2) Whakamātautau ātete pānga

Ko te tikanga mō te whakamātautau pānga ko te tāuta i ngā niho PDC ki te koki o te 15-25 nekehanga, kātahi ka whakataka i tētahi mea mai i tētahi teitei hei patu i te paparanga taimana i runga i ngā niho PDC poutū. Ko te taumaha me te teitei o te mea e hinga ana e tohu ana i te taumata pūngao pānga e pā ana ki te niho whakamātautau, ka taea te piki haere ki te 100 joule. Ka taea te pānga ki ia niho e 3-7 ngā wā tae noa ki te kore e taea te whakamātautau anō. I te nuinga o te wā, neke atu i te 10 ngā tauira o ia momo niho ka whakamatautauria i ia taumata pūngao. Nā te mea he whānuitanga te ātete o ngā niho ki te pānga, ko ngā hua whakamātautau i ia taumata pūngao ko te horahanga toharite o te pakaru taimana i muri i te pānga mō ia niho.

2. Whakamātautau kore-whakangaro

Ko te tikanga whakamātautau kore-whakangaro e whakamahia whānuitia ana (haunga te tirotiro tirohanga me te tirotiro mōkito) ko te matawai ultrasonic (Cscan).

Ka taea e te hangarau matawai C te kite i ngā hapa iti me te whakatau i te wāhi me te rahi o ngā hapa. I te wā e mahi ana i tēnei whakamātautau, tuatahi whakanohoia te niho PDC ki roto i te tāke wai, kātahi ka matawai ki te whakamahi i te taputapu ultrasonic;

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