Nzira yekugadzira Tungsten Carbide?

    Zvigadzirwa zveTungsten Carbide zvinoshandiswa mune akawanda maapplication, anosanganisira kucheka maturusi, kudhirowa, kubaya, uye akawanda mamwe maapplication. Cemented Carbide inopa yepamusoro kupfeka kuramba uye inowedzera hupenyu hweaya akasiyana maturusi ekupfeka nekucheka. Chikonzero chechikamu chayo chikuru ndeye tungsten, iyo isingawanzo uye isingadzokerike sosi, mutengo wesimende carbide wakakwira zvakanyanya. Pamusoro pezvo, simende carbide ine hurema hwakati wandei, uye simba rayo rekukotama rakadzikira kupfuura remamwe simbi, sesimbi. Nezvikonzero zviviri izvi, simende carbide inofanirwa kubatana kune dzimwe simbi nenzira dzakasiyana, senge kuburikidza neshinda dzakabatanidzwa, clamping, uye welding. Ichi chinyorwa chiri kutaura nezve nzira yekushongedza tungsten carbide pane mamwe simbi.

1. Chii chinonzi tungsten carbide?

    Tungsten carbide (WC), inonziwo simende carbide, chinhu chakaumbwa chinogadzirwa nemaitiro anonzi poda metallurgy. WC poda inosanganiswa nesimbi inosungirirwa, kazhinji cobalt kana nickel, yakamisikidzwa mune preform tooling, yozopinzwa muchoto. Izwi rekuti "cemented" rinoreva tungsten carbide zvimedu zviri kutorwa musimbi binder zvinhu uye "simende" pamwe chete, zvichiita chisungo chesimbi pakati petungsten carbide zvimedu uye binder (WC-Co), mukuita sintering. Indasitiri inesimende yecarbide inowanzo reva chinhu ichi sechingori "carbide", kunyangwe mazwi ekuti tungsten carbide uye simende carbide achishandiswa zvakasiyana.  Carbide inoratidza simba rekumanikidza, inopikisa kutsauka, uye inochengeta hurema hwayo patembiricha yakakwira, chivakwa chemuviri chinonyanya kukosha mukutema simbi. 

2 . Mapoinzi maviri kuti ave nechokwadi chekubudirira mukugadzira tungsten carbide

A.Kugadzirisa kushushikana kunokonzerwa nekusiyana kwekuwedzera

B. Contraction rates yezvinhu zvevabereki nekunyorova kwecarbide ne braze alloy

    Panguva yekudziya uye kutonhora, simbi yemubereki inozowanzo wedzera uye chibvumirano pamwero wepamusoro kupfuura carbide.  Tungsten carbide ine mwero wekupisa wekupisa unosvika 1/3 kusvika 1/2 iyo yesimbi.  Kana iyo brazed gungano inotonhora, kusara kunetseka kunogona kuvaka mukati me carbide.  Kunonoka yunifomu kutonhora kwecarbide kunogara kuchikurudzirwa kuti udzivise kushushikana uye zvichibvira kuputika. Kudzima hakukurudzirwe sezvo zvichigona kukonzera kutsemuka mucarbides nekuda kwekukurumidza kuputika kwesimbi yesimbi yevabereki.

3. Ungasarudza sei braze alloy

    Tungsten carbide yakaoma kunyorova. Silver braze alloys ane madiki ekuwedzera eNickel (Ni) anowanzo shandiswa kubraze carbides kuita simbi. Ehe, zvese zviri zviviri carbide nesimbi zvinofanirwa kuve zvakachena kuitira kuti yakanyungudutswa braze alloy inogona kunyorovesa nzvimbo dzekubatana zvachose. Kukuya nzvimbo ye carbide kugadzira nzvimbo yakachena yebrazing inodiwa. Kukuya zvakare kune mukana wekubata kumeso pamusoro peiyo carbide, iyo inogona kubatsira nebraze alloy wetting uye adhesion. Zvikamu zvesimbi, zvakafanana, zvaizoda kucheneswa kubvisa chero girizi yasara, oiri, tsvina, kana zvimwe zvinosvibisa pamusoro.  

    ·Masimbi esirivha mabraze alloys ane madiki ekuwedzera enickel (Ni) uye Manganese (Mn) anonyorovesa zviri nyore. Aya mabraze alloys anowanzo ratidza kunyorova kwe tungsten carbides.  Zvinokurudzirwa kusarudza brazing filler simbi ine yakaderera inobvira bhurashi tembiricha kuderedza kushushikana kwasara mukati mejoinhi.  

For applications anosanganisira kubvongodzwa kwecarbides hombe, sandwich braze alloy inowanzoshandiswa.  Kana madiki carbides (1/2 inch2) asingakwanisi kushandiswa, sandwich alloy inobatsira mukudzivirira kuputika uye warpage ye carbide. Aya ma trimetal akapfekedzwa nebraze filler yakasungirirwa kumativi ese emhangura core.  

    ·Kunyange zvazvo hurukuro zhinji dzave dzakatenderedza brazing ye tungsten carbide (WC), tingave takanganisa kana tisina kutaura polycrystalline diamond kana PCD. Iyo tembiricha yekupisa yePCD inowanzo chengetwa pazasi 1382 ° F (750 ° C) kudzivirira kushatiswa kwedhaimondi.  Kazhinji, vagadziri vePCD matipi kumitumbi yesimbi vachashandisa yakaderera-tembiricha, yakakwirira-silver braze filler simbi, senge BAg-24 braze alloy.  Vamwe vanogadzira vanoshandisa braze alloy isina nickel kana manganese, senge BAg-5 kana BAg-7 braze alloy, ine tembiricha yakaderera yekunyungudika uye kushomeka kwemvura yecarbide nesimbi.

    Iyo brazing flux inoshandiswa kudzivirira oxidation yenzvimbo inobatanidzwa panguva yekupisa kwegungano.  Flux poda inoshandiswa neyakajairwa sirivheri braze alloys.  Black flux poda inowanzokurudzirwa nevagadziri ve braze uye flux sezvo iine yekuwedzera boron uye inoshanda zvakanyanya pakupisa kwepamusoro.

    Kune akati wandei brazing alloys anoshandiswa kune carbide. Iyo classic ndeye BAG-3, 50% sirivha ine Cadmium.  Ichi chigadzirwa chakanakisa, asi chine Cadmium. Inowanzoshandiswa iBAG-7, 56% sirivha ine Tin, nokuti inonyorova kunze nyore; zvisinei, iyo ishoma kwazvo brazing alloy, uye kutadza kwemajoini kwakajairika neiyi alloy. Iyo yakasimba kwazvo isiri-Cadmium alloy iBAG-22, 49% sirivheri ine manganese, asi iine gummy mukuyerera. BAG-24, 50% Silver, haina cadmium uye inobvumirana.  Inoyerera zvakanaka asi inenge 40% isina simba pane BAG-3 uye BAG-22.

    Isu tinonyanya kuda Nhema Flux, kunyangwe vazhinji vachibhuroka vakabudirira neWhite Flux. Muzviitiko zvose zviri zviviri, zviri pachena high tembiricha fluxes. Mukuwedzera, n tinoona kuti yakacheneswa Nhema Flux inopa kuyerera kuri nani uye majoini akasimba kupfuura akajairwa Nhema Flux.  

    Nzvimbo yekupedzisira apo kukanganisa kunowanzoitika mukugadzirwa kwemajoini. Vakadzidziswa welders vanowanzoda kuunganidza zvikamu vobva vamhanyisa bead. Pavanenge vachipisa, vanoda kuunganidza zvikamu uye vobva vapinza simbi yesimbi mujoini.   

    Paunenge uchigadzira carbide, inowanzoita zvakanyanya kuyerera mativi uye pasi peiyo notch, wozoisa zvidimbu zve fluxed alloy waya pasi pe carbide.  Zvose zvaunoita zvino kupisa kusvikira carbide yagara panzvimbo.   

    Chiyero chinofanira kunge chiri chekuti carbide inoputika kana simbi inoputika musati majoini apera.