Carbide yog cov chav siv hluav taws xob ntau tshaj plaws ntawm cov khoom siv nrawm nrawm (HSM) cov khoom siv hlau, feem ntau yog tungsten carbide WC) hais thiab ib lub softer hlau khi. Tam sim no, muaj ntau pua ntawm WC-as raws cov carbides ua kom sib txawv, feem ntau uas siv cobalt, feem ntau yog siv cov phau ntawv, thiab lwm yam kuj tuaj yeem ntxiv Cov. qee cov ntsiab lus tso tawm. Vim li cas thiaj muaj ntau cov qhab nia carbide? Cov Cuab Yeej Siv Cov Cuab Yeej Xaiv cov khoom siv yog cov khoom siv rau qee cov haujlwm txiav tshwj xeeb? Txhawm rau teb cov lus nug no, cia thawj zaug saib ntawm ntau cov khoom uas ua rau cov khoom siv carbide ib qho khoom siv zoo tagnrho.
Hardness thiab tawv
WC-CO cemented carbide muaj cov txiaj ntsig tshwj xeeb hauv ob lub hardness thiab tawv. Tungsten carbide (WC) yog inherently nyuaj (ntau dua corundum lossis alumina), thiab nws hardness tsis tshua muaj tsawg dua li kev ua haujlwm kub nce ntxiv. Txawm li cas los xij, nws tsis muaj qhov nyuaj txaus, ib qho khoom tseem ceeb rau cov cuab yeej txiav. Txhawm rau kom muaj txiaj ntsig zoo ntawm lub siab tawv ntawm tungsten carbide thiab kom cov khoom siv hlau kom deb li ntawm cov hlau ceev, thaum muaj peev xwm tiv taus feem ntau txiav . txiav yuam. Ntxiv rau, nws tuaj yeem tiv taus qhov siab txiav qhov kub los ntawm kev nrawm nrawm nrawm.
Niaj hnub no, yuav luag txhua qhov WC-CE riam thiab ntxig yog coated, yog li lub luag haujlwm ntawm cov khoom siv hauv paus zoo li tseem ceeb. Tab sis qhov tseeb, nws yog lub siab modulus ntawm cov khoom siv wc-co (ib qho kev ntsuas ntawm cov hlau ceev, uas muab cov txheej txheem tsis zoo rau cov txheej. WC-CC-CATRIX kuj tseem muab cov kev muaj kev nruj. Cov khoom no yog cov khoom tseem ceeb ntawm WC-CO khoom, tab sis cov khoom siv kuj tseem tuaj yeem hloov kho cov ntaub ntawv muaj pes tsawg leeg thiab microstructure thaum ua cov khoom noj kom ua rau carbide hmoov. Yog li ntawd, cov haum rau cov cuab yeej ua tau zoo rau cov machining tshwj xeeb yog nyob ntawm ib qho loj ntawm tus txheej txheem ntawm thawj zaug.
Milling txheej txheem
Tungsten carbide hmoov yog tau los ntawm carburizing tungsten (w) hmoov. Cov yam ntxwv ntawm tungsten carbide hmoov (tshwj xeeb tshaj yog nws qhov me me) tsuas yog nyob ntawm cov khoom siv raw tungsten hmoov thiab ntsuas kub thiab sijhawm ntawm carburization. Tshuaj lom neeg tswj hwm kuj tseem ceeb, thiab cov pa roj carbon ntau yuav tsum tau cia kom ruaj khov (ze rau cov nqi stoichiometric ntawm 6.13% los ntawm qhov hnyav). Ib qho me me ntawm vanadium thiab / lossis chromium yuav tau ntxiv ua ntej kev kho mob carburizing kom tswj tau cov hmoov particle loj los ntawm cov txheej txheem tom ntej. Cov txheej txheem dej ntws sib txawv thiab cov ntsiab lus sib txawv kawg ntawm kev siv cov ntsiab lus carbide thiab chromium cov ntsiab lus thiab ntau yam sib txawv ntawm cov hmoov ntau uas tau tsim tawm. Piv txwv li, ATI Alldyne, tungsten carbide hmoov chaw tsim tshuaj paus, thiab ntau yam ntawm tungsten carbide hmoov customized raws li 5 zaug uas ntawm cov qauv ntawm tungsten carbide hmoov.
Thaum sib tov thiab sib tsoo tungsten carbide hmoov thiab hlau khi los tsim cov qib ntawm carbide hmoov, ntau yam kev sib txuas siv tau siv. Feem ntau siv cov ntsiab lus cibalt yog 3% - 25% (qhov hnyav piv), thiab suav nrog rau cov cuab yeej, nws yog ib qho tsim nyog yuav ntxiv npib tsib thiab chromium. Tsis tas li ntawd, cov sib khi hlau yuav tuaj yeem txhim kho txuas ntxiv los ntawm kev ntxiv lwm cov txheej txheem alloy. Piv txwv li, ntxiv ruthenium rau WC-co cemented carbide tuaj yeem txhim kho nws cov tawv yam tsis muaj txo nws lub hardness. Ua kom cov ntsiab lus ntawm binder kuj tseem tuaj yeem txhim kho kev tawv ntawm kev tso cai ntawm carbide, tab sis nws yuav txo nws lub hardness.
Txo qhov loj me ntawm lub tungsten carbide hais tuaj yeem nce kev tawv tawv ntawm cov khoom, tab sis cov particle loj ntawm lub tungsten carbide yuav tsum tseem zoo ib yam thaum lub sijhawm Sintering. Lub sijhawm Sintering, lub tungsten carbide hais ua ke thiab loj hlob los ntawm txheej txheem ntawm kev sib cais thiab rov ua dua. Nyob rau hauv qhov tseeb sintering cov txheej txheem, nyob rau hauv thiaj li yuav tsim cov khoom siv ntom ntom ntom ntom ntom ntom, cov hlau sib khi ua kua (hu ua kua Theem Sintering). Txoj kev loj hlob ntawm tungsten carbide hais tau tswj los ntawm kev ntxiv lwm cov kev hloov pauv hlau (vil), tac), thiab niobium carbide (NBC). Cov hlau carbides no feem ntau ntxiv thaum lub tungsten carbide hmoov yog sib xyaw thiab chromium carbide hmoov tseem tuaj yeem tsim thaum lub tungsten carbide hmoov yog carburized.
Tungsten carbide hmoov kuj tseem tuaj yeem tsim los ntawm kev siv cov khoom noj uas ua kom rov qab ua kom cov khoom siv carbide. Cov rov qab ua dua tshiab thiab rov qab siv dua tshiab carbide muaj keeb kwm ntev hauv kev lag luam carbide uas muaj txiaj ntsig, txuag cov khoom siv khoom siv thiab tsis txhob muaj cov khoom siv ntuj. Ua kom muaj kev phom sij. SEEM MAASED Carbide feem ntau yuav tau rov qab siv los ntawm Apt (ammonium paratungstate) cov txheej txheem, qhov ua rov qab los yog crushing. Cov "rov ua dua tshiab" tungsten carbide hmoov feem ntau muaj qhov ua kom zoo dua qub, paub tias lawv muaj cov hmoov uas tsis muaj hmoov ntawm cov txheej txheem tungenen carburizing.
Kev ua cov mob sib tsoo ntawm cov sib sib xyaw ua ke ntawm tungsten carbide hmoov thiab hlau khi kuj tseem ceeb txheej txheem tsis muaj txiaj ntsig. Ob lub ob feem ntau siv milling cov tswv yim yog pob milling thiab micromilling. Ob qho tib si txheej txheem muaj peev xwm ua kom cov khaub ncaws sib xyaw ntawm cov hmoov nplej thiab txo cov particle loj. Txhawm rau ua kom cov workpiece tom qab muaj lub zog txaus, tswj hwm tus kws ua haujlwm lossis tswj hwm tus neeg ua haujlwm, nws yog feem ntau yuav tsum tau ntxiv cov khoom siv organic thaum sib tsoo. Cov tshuaj lom neeg muaj pes tsawg leeg ntawm qhov kev sib khi no tuaj yeem cuam tshuam qhov ntom ntom thiab lub zog ntawm lub pressed workpiece. Txhawm rau pab txhawb kev tuav, nws raug nquahu kom ntxiv lub zog siab, tab sis qhov no ua rau cov leeg pob txha uas muaj peev xwm ua rau muaj kev tsis txaus ntseeg.
Tom qab milling, cov hmoov feem ntau yog tshuaj tsuag-qhuav los ua cov dej dawb-ntws agglomerates tuav ua ke los ntawm cov organic binders. Los kho cov lus sib xyaw ntawm cov organic binder, cov wangerilability thiab them nqi ntom ntawm cov agglomerates tuaj yeem tsim nyog raws li xav tau. Los ntawm kev soj ntsuam cov coarser lossis cov ntawv faib tawm tag nrho, cov particle loj faib tawm tuaj yeem ua kom zoo dua thaum thauj khoom hauv cov pwm kab noj hniav.
Kev tsim khoom ua haujlwm
Carbide workpieces tuaj yeem tsim los ntawm ntau txoj kev txheej txheem. Ua raws li qhov loj me ntawm qhov chaw ua haujlwm, theem ntawm cov duab nyuaj, thiab cov kev txiav ntau ntau, feem ntau txiav cov colded yog pwm siv saum toj-thiab hauv qab-siab nruj tuag. Txhawm rau kom muaj kev sib xws ntawm workpione yuag thiab qhov loj me thaum nias, nws yog ib qho tsim nyog yuav kom ntseeg tau tias qhov ntau thiab ntim rau hauv kab noj hniav yog qhov qub. Lub fluidity ntawm cov hmoov yog feem ntau tswj tau los ntawm qhov loj faib ntawm agglomerates thiab cov khoom ntawm cov organic binder. Moulded workpieces (lossis "blanks") yog tsim los ntawm kev thov moulding siab ntawm 10-80 ksi (kilo phaus ib square ko taw) rau cov hmoov thauj khoom hauv cov khoom noj kab noj hniav.
Txawm nyob rau hauv siab molding siab, lub zog tungsten carbide hais yuav nias lossis tawg, tab sis cov organic los yog nias rau hauv cov khoob ntawm cov khoom ntawm cov khoom ntawm cov khoom. Qhov siab dua lub siab, lub zog sib khi ntawm lub tungsten carbide hais thiab ntau dua qhov ua kom ntev ntawm lub workpiece. Cov khoom siv pwm ntawm cov qib ntawm cov khoom noj carbide yuav sib txawv, qhov loj ntawm agglomeration, thiab muaj pes tsawg leeg thiab kev sib xyaw ntawm cov organic binder. Txhawm rau muab cov ntaub ntawv ntau ntxiv txog cov lus sib xyaw ntawm cov qhab nia ntawm cov khoom siv carbide, kev sib raug zoo ntawm kev siv tshuaj pleev carbide Cov ntaub ntawv no kom ntseeg tau tias cov hmoov uas tau muab tau yooj yim nrog lub tshuab tsim chaw tsim khoom moulding txheej txheem.
Loj-loj carbide workpieces lossis carbide workpieces nrog shanks sib piv (kev xyaum rau cov qib siab ntawm carbide hmoov nyob rau hauv lub hnab hloov tau. Txawm hais tias lub voj voog ntau lawm ntawm txoj kev nias ntev ntev ntev dua li cov qauv mould, yog li cov qauv tsim nyog rau cov khoom lag luam me me.
Cov txheej txheem txheej txheem no yog muab cov hmoov rau hauv lub hnab, thiab tom qab ntawd muab lub hnab ntim rau hauv ib qho kev ntsuas ntawm 30-60ksi los ntawm lub tshuab hydraulic mus nias. Nias workpieces feem ntau yog machined rau cov geometries ua ntej Sintering. Qhov loj ntawm lub hnab ntim tau nthuav kom haum raws li workpiece shrinkage thaum lub sijhawm sib dhos thiab muab cov npoo kom txaus rau kev sib tsoo cov haujlwm. Txij li thaum cov workpiece xav tau ua tiav tom qab nias, qhov yuav tsum tau ua rau kev them nyiaj tsis raws li cov hmoov ntawm cov hmoov uas yog thauj khoom rau hauv lub hnab txhua lub sijhawm. Yog tias txoj kev them nyiaj ntau ntawm cov hmoov me me dhau, nws yuav ua rau tsis muaj hmoov hauv lub hnab, ua rau lub zog ua haujlwm me me thiab yuav tsum tau txhuam. Yog tias qhov chaw thau khoom ntom ntawm cov hmoov yog dhau lawm, thiab cov hmoov thauj mus rau hauv lub hnab yog ntau dhau, qhov workpiece xav tau ua kom tshem cov hmoov ntau tom qab nws nias. Txawm hais tias qhov dhau ntawm cov hmoov tshaj tshem tawm thiab scrapped workpieces tuaj yeem rov ua dua tshiab, ua cov khoom lag luam txo qis.
Carbide workpieces tseem tuaj yeem tsim cov kev siv kev sib zam lossis kev txhaj tshuaj tuag. Lub extrusion moulding txheej txheem yog qhov tsim nyog dua rau cov loj ntau lawm ntawm cov txheej txheem Axisymmetric feem ntau yog siv rau cov duab ntau lawm ntawm cov duab ua haujlwm. Hauv cov txheej txheem molding, qib kawm ntawm cov tshuaj txhuam carbide hmoov tau raug tshem tawm cov tshuaj txhuam hniav uas zoo li cov tshuaj txhuam hniav ua ke. Qhov sib xyaw ua ke yog tom qab ntawd txawm yog ib lub qhov muag lossis txhaj rau hauv kab noj hniav los ua. Cov yam ntxwv ntawm cov qib ntawm kev tso cai carbide hmoov txiav txim siab qhov sib tov, thiab muaj qhov cuam tshuam tseem ceeb ntawm cov sib xyaw los ntawm kev sib xyaw ntawm kab noj hniav.
Tom qab lub workpiece yog tsim los ntawm molding, iasteratic nias, extrusion lossis txhaj tshuaj molding, cov organic binder yuav tsum tau muab tshem tawm ntawm qhov chaw ua haujlwm ua ntej lub sijhawm kawg Sintering. Sintering tshem tawm porosity los ntawm workpiece, ua rau kom puv (lossis tsim nyog) ntom. Thaum lub sijhawm sintering, cov hlau sib khi hauv cov ntawv ua haujlwm xovxwm ua kua, tab sis cov ua haujlwm ua haujlwm tau ua kua, tab sis cov qauv ua haujlwm khaws cia hauv kev sib xyaw ua ke ntawm cov capillary rog thiab kev sib txuas.
Tom qab sinininging, workpiece geometry tseem zoo li qub, tab sis qhov ntev yog txo. Txhawm rau kom tau txais cov haujlwm uas yuav tsum tau ua tom qab Sinining, shrinkage tus nqi yuav tsum tau txiav txim siab thaum tsim cov cuab yeej. Cov qib ntawm carbide hmoov siv los ua txhua lub cuab tam yuav tsum tsim los muaj qhov tseeb shrinkage thaum compacted nyob rau hauv lub siab siab.
Nyob rau hauv yuav luag txhua kis, post-sintering kev kho ntawm cov sintered workpiece yuav tsum tau. Qhov kev kho mob tseem ceeb tshaj plaws ntawm kev txiav cov cuab yeej yog kom txiav txoj kev txiav ntug. Muaj ntau cov cuab yeej siv yuav tsum sib tsoo ntawm lawv cov geometry thiab qhov ntev tom qab sintering. Qee cov cuab yeej xav tau kev sib tsoo saum thiab hauv qab; Lwm tus xav tau kev sib tsoo hluav taws xob (nrog lossis tsis muaj txiav cov txiav ntug). Txhua tus carbide chips los ntawm kev sib tsoo tuaj yeem rov ua dua tshiab.
Workpiece txheej
Feem ntau, cov workpiece tiav yuav tsum tau cooated. Cov txheej txheej muab lub zog thiab nce hardness, ntxiv rau qhov sib cais sib raug zoo rau lub substrate rau lub substrate mus rau substrate, tiv thaiv oxidation thaum raug rau qhov kub. Cov cemented carbide substrate yog qhov tseem ceeb rau kev ua tau zoo ntawm txheej. Ntxiv nrog rau kev txiav cov khoom tseem ceeb ntawm cov hmoov av matrix, cov khoom ntawm cov khoom ntawm matrix kuj tseem tuaj yeem raug txiav los ntawm kev xaiv tshuaj thiab hloov cov txheej txheem SININING. Los ntawm kev tsiv teb tsaws ntawm cobalt, ntau dua cobalt yuav ua rau txheej txheem sab nraud ntawm cov hniav uas muaj lub zog zoo dua qub, ua rau nws muaj zog resistant rau deformation.
Raws li lawv tus kheej cov txheej txheem tsim khoom (xws li cov txheej txheem Dewaxing, cov cua sov, cov chaw tsim khoom siv tau muaj qee qhov kev ua haujlwm tshwj xeeb rau qib kawm ntawm cov tshuaj pleev ib ce ntawm cov carbide hmoov siv. Qee lub tuam txhab xa tawm tuaj yeem sinter lub workpiece hauv lub tshuab nqus cua sov, thaum lwm tus yuav siv lub tshuab ua haujlwm kub (hip) sitering Workpieces sintered nyob rau hauv lub tshuab nqus cub tej zaum kuj yuav tsum tau ua lub tshuab nqus tsev kuj tseem yuav tsum tau ua kom muaj dua los ntawm ib qho txheej txheem ntxiv kom nce ntom ntom ntom. Qee cov tuam txhab twj yuav siv lub tshuab nqus tsev siab dua kom nce cov lus sib xyaw nrog cov ncauj lus sib xyaw, tab sis txoj kev no yuav ci ntsaentructure. Txhawm rau kom muaj lub ntsej muag zoo, hmoov nrog cov particle me me ntawm cov tungsten carbide tuaj yeem xaiv tau. Txhawm rau kom phim cov khoom siv ntau lawm, cov khoom siv dag zog thiab carburizing voltage kuj muaj cov kev xav tau sib txawv rau cov pa roj carbide hmoov.
Kawm Kev Kawm Qib Siab
Kev hloov pauv ntawm ntau hom tungsten carbide hmoov, sib tov muaj pes tsawg cov ntsiab lus inhibitor, thiab lwm yam thiab lwm yam. Cov kev ntsuas no yuav txiav txim rau microstructure ntawm cov cemented carbide thiab nws cov khoom. Qee cov kev sib txuas ua ke ntawm cov khoom tau ua qhov tseem ceeb rau qee cov ntawv thov tshwj xeeb, ua rau nws muaj nuj nqis los cais ntau yam cemented carbide qib.
Qhov ob feem ntau siv carbide chav kawm tshuaj rau kev siv cov ntawv thov tshuab yog C txoj kev tsim qauv thiab cov qauv ISO. Txawm hais tias nruab nrab ntawm cov txheej txheem txhua tus muaj kev cuam tshuam cov khoom uas cuam tshuam rau cov kev xaiv ntawm cov qib carbide qib, lawv muab qhov pib ntawm kev sib tham. Rau txhua qhov kev faib tawm, muaj cov tuam ntxhab muaj lawv cov qhab nia tshwj xeeb, ua rau muaj ntau yam carbide qib.
Cov qhab nia carbide cov qhab nia tseem tuaj yeem tau txais kev cais los ntawm kev sib xyaw. Tungsten carbide (WC) Cov qib yuav muab faib ua peb hom khoom pib: Yooj yim, microcrystalline thiab txuam nrog. Cov qhab nia yooj yim muaj nyob ntawm tungsten carbide thiab cobalt binders, tab sis kuj tseem tuaj yeem muaj cov qoob loo me me kev loj hlob inibitors. Lub microcrystalline qib yog tsim ntawm tungsten carbide thiab cobalt binder ntxiv nrog ob txhiab tus neeg chromium (v3c2), thiab nws cov qoob loo loj tuaj yeem ncav cuag 1 μm lossis tsawg dua. Allolo qib yog tsim los ntawm tungsten carbide thiab cobalt binders muaj ob peb feem pua titanium carbide (tac), thiab niobium carbide (NBC). Cov kev ntxiv no tseem hu ua cov cubic carbides vim yog lawv cov sintering cov khoom. Lub txiaj ntsig microstructure cov kev ua kom muaj kev txhim kho inhomogeneous peb-theem qauv.
1) Cov qib carbide yooj yim
Cov qib no rau cov hlau txiav feem ntau muaj 3% rau 12% cobalt (los ntawm qhov hnyav). Qhov loj ntawm tungsten carbide nplej feem ntau yog thaum 1-8 μm. Raws li nrog lwm cov qib, txo qhov me me ntawm tungsten carbide nce nws lub hardness ntxiv thiab transverse rupture lub zog (TRS), tab sis txo nws txoj kev nruj. Lub hardness ntawm cov hom ntshiab yog feem ntau ntawm HRA89-93.5; Lub zog transverse rupture yog feem ntau ntawm 175-350ksi. Cov hmoov ntawm cov qib ntawm cov qib no yuav muaj cov khoom siv uas rov siv dua tshiab.
Cov qib yooj yim hom tuaj yeem faib ua C1-C4 hauv C-C4 hauv C-C4 hauv qib K, N, S thiab H thiab qib. Cov qhab nia yooj yim nrog cov khoom nruab nrab tuaj yeem raug cais ua cov qib dav dav (xws li C2 lossis KANING, kev ua haujlwm, phiaj xwm thiab tho txawv; Cov qib nrog cov qoob loo me me lossis qis dua cov ntsiab lus cob qhia thiab kev ua kom siab dua tuaj yeem cais raws li cov qib tiav (xws li C4 lossis K01); Cov qib uas muaj cov qoob loo loj dua los yog cov ntsiab lus zoo dua thiab cov tawv me me tuaj yeem raug cais raws li cov qib uas muaj cov qhab nia (xws li C1 lossis K30).
Cuab yeej ua nyob rau hauv cov qib yooj yim tau siv rau machining cam khwb cia hlau, 200 thiab lwm cov hlau uas tsis muaj hlau, superalloys thiab cov tawv tawv tawv. These grades can also be used in non-metal cutting applications (eg as rock and geological drilling tools), and these grades have a grain size range of 1.5-10μm (or larger) and a cobalt content of 6%-16%. Lwm qhov kev txiav tsis yog hlau txiav ntawm cov qhab nia carbide yooj yim yog hauv kev tsim cov tuag thiab xuas nrig ntaus. Cov qhab nia no feem ntau muaj cov nplej nruab nrab nrog cov ntsiab lus cob lub ntsiab ntawm 16% -30%.
(2) Microcrystalline cemented carbide qib
Xws li cov qib feem ntau muaj 6% -15% Cobalt. Thaum lub sij hawm ua kua ntu Sinterling, ntxiv rau ntawm vanadium carbide thiab / lossis chromium carbide tuaj yeem tswj lub noob nplej zoo nrog tsawg dua 1 μm. Cov kab ke zoo no muaj ntau lub hardness thiab transverse rupture zog kuj saum toj 500ksi. Kev sib xyaw ua ke ntawm lub zog siab thiab cov tawv txaus tso cai rau cov qib no tau siv lub zog loj dua, uas txo cov chips los ntawm kev txiav cov khoom siv hlau.
Los ntawm kev pom zoo nruj ntawm ntau cov ntaub ntawv hauv kev tsim cov qib carbide cov hmoov av loj, thiab ua tau kom tau txais cov khoom tsim nyog. Txhawm rau kom cov noob nplej me me thiab niaj hnub ua kom zoo dua qub yuav tsum tsuas yog siv yog tias muaj tag nrho cov khoom siv raw thiab rov ua haujlwm zoo.
Lub Microcrystalline cov qib yuav tau faib raws li M Qib Kawm nyob rau hauv ISO qib system. Ib qho ntxiv, lwm txoj kev sib qhia hauv C Qib thiab ISO qib kev ua yog tib yam li cov qib siab dawb huv. Microcrystalline cov qib yuav siv tau los ua cov cuab yeej uas txiav softer workpiece cov ntaub ntawv, vim tias cov cuab yeej ua haujlwm zoo heev thiab tuaj yeem tswj hwm tus ntse ntse.
Microcrystalline cov qib kuj tseem siv tau rau lub tshuab nickel-based supalloys, raws li lawv tuaj yeem tiv thaiv kom kub txog li 1200 ° C. Rau kev ua cov supalloys thiab lwm cov ntaub ntawv tshwj xeeb, kev siv microcrystalline cov cuab yeej thiab cov kev coj ua kom tsis kam, deformation tiv taus thiab tawv. Microcrystalline qib tseem tsim nyog rau kev tsim cov cuab yeej tig xws li kev tho kev uas tsim kom muaj kev ntxhov siab shear. Muaj ib lub laum ua los ntawm cov qhab nia ntawm cov lej ntawm cov pa nyuj xis. Hauv ntu tshwj xeeb ntawm tib lub laum, cov ntsiab lus cobal hauv cov khoom sib txawv, yog li ntawd lub hardness thiab tawv ntawm lub laum yog qhov zoo raws li kev xav tau.
(3) alloy hom cemented carbide qib
Cov txheej txheem no tsuas yog siv rau kev txiav cov hlau seem, thiab lawv cov ntsiab lus cobalt feem ntau yog 5% -10%, thiab cov noob qoob loo loj me ntawm 0.8-2μm. Los ntawm kev ntxiv 4% -25% titanium carbide (TIC), qhov nyiam ntawm tungsten carbide (WC) kom diffuse rau saum npoo ntawm cov hlau chips tuaj yeem txo. Cuab lub zog, kev hnav kev ua pob zeb ua kom tsis kam thiab thermal poob siab kuj tuaj yeem txhim kho los ntawm kev ntxiv txog li 25% tev carbide (tac) thiab niobium carbide (NBC). Qhov kev sib ntxiv ntawm cov neeg carbides kuj nce lub hardness liab ntawm cov cuab yeej, pab kom tsis txhob muaj thermal deformation ntawm cov cuab yeej hnyav lossis lwm yam haujlwm uas qhov kev txiav siab yuav ua rau muaj qhov kub. Tsis tas li ntawd, Titanium Carbide tuaj yeem muab cov chaw nucleation thaum sintering, txhim kho kev hnav khaub ncaws ntawm cubic carbide faib hauv lub workpiece.
Feem ntau hais lus, cov hardness ntau ntawm alloy-Hom cemented carbide cov qhab nia yog HRA91-94-94, thiab transverse satvus muaj zog yog 150-300ksi. Piv nrog cov qib siab dawb, alloy cov qib muaj cov coj tsis zoo thiab txo lub zog, tab sis tau muaj qhov tsis kam zoo rau kev hnav khaub ncaws nplaum. Alloy cov qib yuav muab faib ua C5-C8 hauv C5-C8 hauv C5 system, thiab tuaj yeem raug cais raws li cov lej P thiab M hauv ISO qib system. Alloy qib nrog cov khoom nruab nrab tuaj yeem raug cais raws li cov hom phiaj dav dav (xws li C6 lossis P30) thiab tuaj yeem siv rau kev tig, tapping, phiaj xwm thiab milling. Cov qib nyuab siab tshaj plaws tuaj yeem cais raws li cov qib tiav (xws li C8 thiab P01) rau kev ua haujlwm tiav thiab tho txawv. Cov qhab nia no feem ntau muaj cov nplej me me thiab tsawg dua cov ntsiab lus kom tau txais cov tawv nqaij uas yuav tsum tau ua. Txawm li cas los xij, cov khoom siv zoo sib xws tuaj yeem tau txais los ntawm kev ntxiv cov ntoo khaub ncaws ntau dua. Cov qib muaj cov qib muaj zog tshaj plaws tuaj yeem faib ua cov qib roughing (piv txwv li C5 lossis P50). Cov qhab nia cov qib no feem ntau muaj cov ntsiab lus nruab nrab thiab cov ntsiab lus tseem ceeb, nrog cov cubic carbides kom ua tiav cov kev xav tau zoo los ntawm kev ua kom tawg. Nyob rau hauv kev cuam tshuam cov haujlwm, kev txiav kev ua tau zoo ntxiv los ntawm kev siv cov qhab nia saum toj saud-nplua nuj nrog cov ntsiab lus ntau dua ntawm cov cuab yeej.
Alloy cov qib nrog cov ntsiab lus carbide hauv qab thiab malleable hlau stainless thiab malleable metrals xws li nickel-based supalloys. Cov noob nplej loj ntawm cov qib kawm feem ntau tsawg dua 1 μm, thiab cov ntsiab lus cobalt yog 8% -12%. Cov qhab nia nyuaj, xws li M10, tuaj yeem siv rau cov hlau tig los; Cov qeb siab dua, xws li M40, tuaj yeem siv rau milling thiab kev npaj ua hlau, lossis rau tig cov hlau stainless lossis superalloys.
Alloy-Hom cemented carbide cov qib kuj tseem siv tau rau cov hom phiaj tsis siv hlau, feem ntau yog rau kev tsim cov khoom-resistant seem. Lub particle loj ntawm cov qib no feem ntau yog 1.2-2 μm, thiab cov ntsiab lus cobal yog 7% -10%. Thaum ua cov qib kawm no, feem pua siab ntawm cov khoom siv raw yog feem ntau ntxiv, ua rau tus nqi siab-ua haujlwm hauv cov ntaub ntawv hnav. Hnav cov khoom yuav tsum tau corrosion zoo thiab siab tawv, uas tuaj yeem tau los ntawm kev ntxiv npib tsib xee thiab chromium carbide thaum ua cov qib no.
Txhawm rau kom tau raws li qhov kev ua haujlwm thiab kev lag luam ntawm cov cuab yeej tsim, carbide hmoov yog lub ntsiab tseem ceeb. Cov hmoov muaj hmoov tsim rau cov cuab yeej tsim qauv 'tshuab siv khoom thiab cov txheej txheem tsis haum kom ua tiav kev ua haujlwm tiav thiab tau ua rau ntau pua ntawm cov qib carbide. Cov khoom siv rov qab ntawm cov ntaub ntawv carbide thiab lub peev xwm los ua haujlwm ncaj qha rau cov hmoov muag khoom kom zoo rau cov cuab yeej siv kom tswj tau lawv cov khoom lag luam zoo thiab cov khoom siv.
Lub Sijhawm Post: Oct-18-2022
