nkhani

Daimondi yopangira

Grit ya diamondi nthawi zambiri imagwiritsidwa ntchito pofotokoza timbewu tating'ono (≈0.00004 in.) ta diamondi yopangidwa yomwe imagwiritsidwa ntchito ngati chinthu chofunikira kwambiri kwa odula a PDC.Pankhani ya mankhwala ndi katundu, diamondi yopangidwa ndi munthu ndi yofanana ndi diamondi yachilengedwe.Kupanga grit ya diamondi kumaphatikizapo njira yosavuta yopangira mankhwala: mpweya wamba umatenthedwa ndi kuthamanga kwambiri komanso kutentha.M'zochita, komabe, kupanga diamondi sikophweka.

Makhiristo a diamondi omwe ali mu grit ya diamondi amapangidwa mosiyanasiyana.Izi zimapangitsa kuti zinthuzo zikhale zolimba, zakuthwa, ndipo, chifukwa cha kuuma kwa diamondi yomwe ili nayo, imakhala yolimba kwambiri.M'malo mwake, mawonekedwe opangidwa mwachisawawa omwe amapezeka mu diamondi yomangika bwino amameta ubweya kuposa diamondi zachilengedwe, chifukwa diamondi zachilengedwe ndi makhiristo a kiyubiki omwe amasweka mosavuta m'malire awo mwadongosolo, makristali.

Grit ya diamondi imakhala yosakhazikika pakatentha kwambiri kuposa diamondi yachilengedwe, komabe.Chifukwa chothandizira zitsulo chomwe chimatsekeredwa mumagulu a grit chimakhala ndi kuchuluka kwamafuta ochulukirapo kuposa diamondi, kukulitsa kosiyana kumayika zomangira za diamondi-to-diamondi pansi pa shear ndipo, ngati katundu ndi wokwanira, kumayambitsa kulephera.Ngati zomangira zilephera, ma diamondi amatayika msanga, kotero PDC imataya kuuma kwake ndi kuthwa kwake ndipo imakhala yosagwira ntchito.Pofuna kupewa kulephera koteroko, odula a PDC ayenera kuziziritsidwa mokwanira pobowola.

Matebulo a diamondi

Kuti apange tebulo la diamondi, grit ya diamondi imayikidwa ndi tungsten carbide ndi zitsulo zomangira kuti zikhale zosanjikiza za diamondi.Mawonekedwe ake ndi opindika, ndipo amayenera kukhala okhuthala momwe angathere, chifukwa kuchuluka kwa diamondi kumawonjezera moyo wovala.Matebulo a diamondi apamwamba kwambiri ndi ≈2 mpaka 4 mm, ndipo kupita patsogolo kwaukadaulo kudzakulitsa makulidwe a tebulo la diamondi.Magawo a Tungsten carbide nthawi zambiri amakhala ≈0.5 in. okwera ndipo amakhala ndi mawonekedwe ophatikizika ndi miyeso yofanana ndi tebulo la diamondi.Zigawo ziwiri, tebulo la diamondi ndi gawo lapansi, zimapanga chodula (mkuyu 4).

Kupanga PDC kukhala mawonekedwe othandiza kwa odula kumaphatikizapo kuyika grit ya diamondi, pamodzi ndi gawo lapansi, muchotengera choponderezedwa kenako ndikutentha kwambiri komanso kupanikizika.

Odula PDC sangaloledwe kupitirira kutentha kwa 1,382°F [750°C].Kutentha kwambiri kumapangitsa kuti pakhale kutha msanga, chifukwa kusiyana kwa kutentha pakati pa binder ndi diamondi kumapangitsa kuti makristasi a diamondi aphwanyidwe patebulo la diamondi.Mphamvu zomangira pakati pa tebulo la diamondi ndi gawo lapansi la tungsten carbide zilinso pachiwopsezo chifukwa chakukula kwamafuta.