Momwe Mungadulire Ndodo ya Tungsten Carbide?

Tikudziwa kuti kuuma kwa chida chokhacho chiyenera kukhala chapamwamba kuposa kuuma kwa ntchito yopangira makina. Kulimba kwa Rockwell kwa carbide yomangidwa nthawi zambiri kumakhala pafupifupi HRA78 mpaka HRA90. Ngati mukufuna kumenya kapena kudula bwino ndodo za tungsten carbide, njira zinayi zotsatirazi zingagwiritsiridwe ntchito, zomwe ndi abrasion wheel grinding, machining by super hard material, electrolytic machining(ECM), and electric discharge Machining(EDM).

1. Dulani ndodo ya carbide kuti musamasowe kanthu ndi kugaya magudumu

Kuyambira pano, zida zomwe zimatha kukonza zosoweka za carbide makamaka zimatanthawuza poly-crystalline kiyubic boron nitride (PCBN) ndi poly-crystalline diamondi (PCD).

Zida zazikulu zopangira mawilo obiriwira ndi silicon carbide ndi diamondi. Popeza kugaya kwa silicon carbide kumapangitsa kupsinjika kwamatenthedwe kupitilira mphamvu ya carbide yomangidwa, ming'alu yapamtunda imachitika kwambiri, zomwe zimapangitsa silicon carbide kukhala njira yabwino yopangira pamwamba yomwe ingakhale yotsimikizika.

Ngakhale PCD akupera gudumu ndi woyenerera kumaliza ntchito zonse kuchokera roughing mpaka kumaliza pa akusowekapo carbide, pofuna kuchepetsa imfa ya gudumu akupera, akusowekapo carbide adzakhala chisanadze kukonzedwa ndi njira machining magetsi, ndiye kuchita theka-kumaliza ndi zabwino- pomaliza ndi gudumu popera.

2. Dulani kapamwamba popeta ndi kutembenuza

Zida za CBN ndi PCBN, zomwe zimapangidwira ngati njira yodula zitsulo zakuda ndi kuuma, monga chitsulo cholimba ndi chitsulo (chitsulo). Boron nitrite imatha kupirira kutentha kwapamwamba (pamwamba pa madigiri a 1000) ndikugwira kuuma pa 8000HV. Katunduyu amachititsa kuti zikhale zofanana ndi kukonzanso zotsalira za carbide, makamaka pazigawo zomangira zomwe zimapangidwa ndi carbide core ndi chitsulo chosungira pansi pa kusokoneza.

Komabe, pamene kuuma kwa simenti mbali carbide ndi apamwamba kuposa HRA90, kotheratu mu mgwirizano wa boron nitrite kudula, sipafunikanso kuumirira PCBN ndi CBN tools.

Sitingathebe kuiwala kuipa kwa ma PCD oyikapo, kulephera kwake kupeza nsonga zakuthwa kwambiri komanso zovuta zopangidwira ndi ma chipbreaker. Choncho, PCD ingagwiritsidwe ntchito podula bwino zitsulo zopanda chitsulo ndi zopanda zitsulo, koma sangathe kukwaniritsa zodula kwambiri zagalasi-kudula zopanda kanthu za carbide, osachepera.

3. Electrolytic Machining (ECM)

Electrolytic processing ndi kukonza magawo ndi mfundo yakuti carbide ikhoza kusungunuka mu electrolyte (NaOH). Zimawonetsetsa kuti pamwamba pa carbide workpiece satenthedwa. Ndipo mfundo ndi yakuti kuthamanga kwa ECM ndi khalidwe la kukonza sizidalira zakuthupi zomwe ziyenera kukonzedwa.

4. Electric discharge Machining (EDM)

Mfundo ya EDM idakhazikitsidwa pakupanga dzimbiri kwamagetsi pakati pa chida ndi chogwirira ntchito (maelekitirodi abwino ndi oyipa) panthawi yotulutsa mpweya kuti muchotse magawo ochulukirapo a carbide kuti akwaniritse zomwe zidakonzedweratu za kukula, mawonekedwe ndi mawonekedwe apamwamba a chogwiriracho. . Maelekitirodi a copper-tungsten okha ndi ma elekitirodi a copper-silver amatha kukonza zosoweka za carbide.

Mwachidule, EDM sichigwiritsa ntchito mphamvu zamakina, sizidalira mphamvu zodula kuchotsa zitsulo, koma mwachindunji zimagwiritsa ntchito mphamvu zamagetsi ndi kutentha kuchotsa gawo la carbide.