Bwerani mudzaphunzire za HSS
Chitsulo chothamanga kwambiri (HSS) ndi chitsulo cholimba kwambiri, chosatha kuphwanyika kwambiri komanso chosatha kutentha kwambiri, chomwe chimadziwikanso kuti chitsulo champhepo kapena chitsulo chakuthwa, zomwe zikutanthauza kuti chimalimba ngakhale chikaziziridwa mumlengalenga panthawi yozimitsa ndipo chimakhala chakuthwa. Chimatchedwanso chitsulo choyera.
Chitsulo chothamanga kwambiri ndi chitsulo chosakanikirana chokhala ndi zinthu zovuta zomwe zimakhala ndi zinthu zopangira carbide monga tungsten, molybdenum, chromium, vanadium ndi cobalt. Kuchuluka kwa zinthu zosakaniza kumafika pafupifupi 10 mpaka 25%. Chimatha kusunga kuuma kwakukulu pansi pa kutentha kwakukulu (pafupifupi 500℃) pakudula mwachangu, HRC ikhoza kukhala pamwamba pa 60. Ichi ndiye chizindikiro chofunikira kwambiri cha HSS - kuuma kofiira. Ndipo chitsulo cha kaboni pogwiritsa ntchito chitsulo chozimitsira ndi kutentha kotsika, kutentha kwa chipinda, ngakhale kuli kuuma kwakukulu kwambiri, koma kutentha kukapitirira 200 ℃, kuuma kudzatsika kwambiri, mu 500 ℃ kuuma kwatsika kufika pamlingo wofanana ndi boma lonyowa, kutayika kwathunthu kuthekera kodula chitsulo, zomwe zimalepheretsa zida zodulira chitsulo cha kaboni. Ndipo chitsulo chothamanga kwambiri chifukwa cha kuuma kofiira kwabwino, kuti chibwezeretse zofooka zakupha za chitsulo cha kaboni.
Chitsulo chothamanga kwambiri chimagwiritsidwa ntchito makamaka popanga zida zodulira zitsulo zovuta komanso zolimba, komanso kupanga ma bearing otentha kwambiri ndi ma dies ozizira, monga zida zosinthira, ma drill, ma hobs, macheka a makina ndi ma dies ovuta.
Bwerani mudzaphunzire za chitsulo cha tungsten
Chitsulo cha Tungsten (carbide) chili ndi zinthu zambiri zabwino monga kuuma kwambiri, kukana kukalamba, kulimba bwino, kukana kutentha, kukana dzimbiri, ndi zina zotero. Makamaka kuuma kwake kwakukulu komanso kukana kukalamba sikunasinthe ngakhale kutentha kwa 500℃, ndipo kumakhalabe ndi kuuma kwambiri pa 1000℃.
Chitsulo cha tungsten, chomwe zigawo zake zazikulu ndi tungsten carbide ndi cobalt, chimapanga 99% ya zigawo zonse ndi 1% ya zitsulo zina, kotero chimatchedwa chitsulo cha tungsten, chomwe chimadziwikanso kuti simenti carbide, ndipo chimaonedwa kuti ndi mano a mafakitale amakono.
Chitsulo cha Tungsten ndi chinthu chopangidwa ndi sintered chomwe chili ndi carbide imodzi yachitsulo. Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide, ndi tantalum carbide ndi zinthu zodziwika bwino za chitsulo cha tungsten. Kukula kwa tinthu ta carbide (kapena gawo) nthawi zambiri kumakhala pakati pa 0.2-10 microns, ndipo tinthu ta carbide timalumikizidwa pamodzi pogwiritsa ntchito chomangira chachitsulo. Zitsulo zomangira nthawi zambiri zimakhala zitsulo zamagulu achitsulo, nthawi zambiri cobalt ndi nickel. Chifukwa chake pali tungsten-cobalt alloys, tungsten-nickel alloys ndi tungsten-titanium-cobalt alloys.
Kupanga sinter ya tungsten ndiko kukanikiza ufawo mu billet, kenako mu uvuni woyatsira moto kuti utenthe kutentha kwina (kutentha kotentha) ndikuusunga kwa nthawi inayake (nthawi yogwira), kenako nkuuziziritsa kuti chitsulo cha tungsten chipezeke ndi zinthu zofunika.
①Tungsten ndi cobalt simenti carbide
Gawo lalikulu ndi tungsten carbide (WC) ndi binder cobalt (Co). Gululi limapangidwa ndi "YG" ("cobalt yolimba" mu Hanyu Pinyin) ndi kuchuluka kwa kuchuluka kwa cobalt. Mwachitsanzo, YG8, zomwe zikutanthauza kuti WCo yapakati = 8% ndipo yotsalayo ndi tungsten carbide yopangidwa ndi simenti.
②Tungsten, titaniyamu ndi cobalt carbide yopangidwa ndi simenti
Zigawo zazikulu ndi tungsten carbide, titanium carbide (TiC) ndi cobalt. Mtundu wake umapangidwa ndi "YT" ("hard, titanium" mu Hanyu Pinyin) ndi avareji ya titanium carbide. Mwachitsanzo, YT15, imatanthauza avareji ya TiC=15%, yotsalayo ndi tungsten carbide ndi cobalt zomwe zili mu tungsten titanium cobalt carbide.
③Tungsten-titanium-tantalum (niobium) carbide
Zigawo zazikulu ndi tungsten carbide, titanium carbide, tantalum carbide (kapena niobium carbide) ndi cobalt. Mtundu uwu wa carbide umatchedwanso general-purpose carbide kapena universal carbide. Mtunduwu uli ndi "YW" ("hard" ndi "miliyoni" mu Hanyu Pinyin) kuphatikiza nambala yotsatizana, monga YW1.
Chitsulo cha Tungsten chili ndi zinthu zambiri zabwino monga kuuma kwambiri, kukana kuvala, mphamvu yabwino komanso kulimba, kukana kutentha, kukana dzimbiri, ndi zina zotero. Makamaka kuuma kwake kwakukulu komanso kukana kuvala sikunasinthe ngakhale kutentha kwa 500℃, ndipo kumakhalabe kuuma kwambiri pa 1000℃. Carbide yopangidwa ndi simenti imagwiritsidwa ntchito kwambiri ngati zipangizo, monga zida zozungulira, zida zopera, zobowola, zida zobowola, ndi zina zotero. Liwiro lodulira la carbide yatsopano ndi lofanana ndi chitsulo cha kaboni nthawi mazana ambiri.
Nthawi yotumizira: Feb-21-2023
