Tshuab raj nplaim kawg yog ib hom khoom siv ntawm high-machining (HSM) cov khoom siv uas tau siv dav. Hom khoom siv no yog tsim los ntawm hmoov metallurgy. Nws muaj qhov nyuaj carbide (feem ntau yog tungsten carbide WC) cov khoom thiab cov hlau ua haujlwm softer. muaj pes tsawg leeg. Muaj pua pua ntawm WC-based cemented carbides sib txawv sib txawv. Lawv feem ntau siv cov cobalt (Co) los ua tus sawv cev. Nickel (Ni) thiab chromium (Cr) kuj tseem siv tau cov khoom siv binder, thiab lwm cov alloys kuj tseem siv tau ntxiv. caij. Vim li cas thiaj li muaj ntau qib cemented carbide? Yuav ua li cas cov khoom siv cemented carbide cov cuab yeej xaiv cov cuab yeej cov cuab yeej tsim nyog rau qee cov txheej txheem txiav? Txhawm rau teb cov lus nug no, cia peb xub nkag siab txog dab tsi ua rau raj nplaim kawg zeb cuab yeej zoo tagnrho Cov yam ntxwv ntawm cov ntaub ntawv.
(1) Hardness thiab toughness
WC-Co cemented carbide cov cuab yeej muaj cov txiaj ntsig zoo hauv ob qho tib si hardness thiab tawv. Tungsten carbide (WC) nws tus kheej muaj lub siab tawv (ntau dua li corundum lossis alumina), thiab nws cov hardness tsis tshua muaj tsawg dua thaum tus kub ua haujlwm nce siab. Txawm li cas los xij, nws tsis muaj qhov muaj tawv tawv, uas yog qhov ua tau zoo rau kev txiav cov cuab yeej. Txhawm rau ua kom zoo dua lub siab hardness ntawm tungsten carbide thiab txhim kho nws cov tawv tawv, tib neeg siv cov khoom siv hlau ua haujlwm txhawm rau txhawm rau tungsten carbide ua ke, yog li cov khoom siv no muaj qhov nyuaj tshaj qhov uas muaj lub siab hlau, thiab tib lub sijhawm nws tuaj yeem tiv taus ntau txheej txheem txiav. Txiav quab yuam. Ib qho ntxiv, nws tuaj yeem tiv taus qhov siab txiav kub uas tsim los ntawm kev siv lub tshuab ua kom siab.
Tam sim no, yuav luag txhua WC-Co cov cuab yeej thiab cov hniav tawg yog coated, yog li lub luag haujlwm ntawm cov khoom siv hauv paus zoo li tsis tseem ceeb. Tab sis qhov tseeb, nws yog qhov siab elastic modulus ntawm WC-Co cov khoom (ib qho kev ntsuas ntawm qhov txhav, chav kub elastic modulus ntawm WC-Co yog li peb zaug ntawm kev kub ceev steel) uas muab cov tsis muaj qhov tsis zoo rau lub txheej. WC-Co nplai kuj tseem tuaj yeem muab cov khoom ua kom tawv. Cov khoom no yog cov yam ntxwv yooj yim ntawm WC-Co cov ntaub ntawv, tab sis nws tseem tuaj yeem hloov kho cov khoom siv los ntawm kev kho cov khoom sib xyaw thiab microstructure thaum ua cov hmoov av cemented carbide.
Yog li ntawd, qhov haum ntawm tshuab raj nplaim kawg zeb kev ua tau zoo thiab cov kev ua ntau yog nyob ntawm thawj txheej txheem milling.
(2) Pulverizing technology ntawm cemented carbide cov cuab yeej
Tungsten carbide hmoov tau los ntawm carburizing tungsten (W) hmoov. Cov yam ntxwv ntawm tungsten carbide hmoov (tshwj xeeb yog nws qhov loj me) feem ntau yog nyob ntawm qhov me me ntawm cov hmoov tungsten nyoos thiab qhov kub thiab lub sijhawm ntawm carburizing. Kev tswj tshuaj yog tseem ceeb heev, thiab cov pa roj carbon ntsiab lus yuav tsum khaws cia tsis tu ncua (ze rau qhov theoretical piv ntawm 6.13% los ntawm qhov hnyav). Txhawm rau tswj hwm cov hmoov particle loj los ntawm cov txheej txheem tom qab, me me ntawm vanadium thiab / lossis chromium tuaj yeem ntxiv ua ntej kev kho mob carburizing. Cov txheej txheem dej ntws sib txawv thiab cov kev siv ua tiav sib txawv kawg yuav tsum muaj kev sib xyaw tshwj xeeb ntawm tungsten carbide particle qhov loj me, cov ntsiab lus carbon, cov ntsiab lus vanadium, thiab cov ntsiab lus chromium. Los ntawm kev hloov pauv ntawm cov kev sib txuas no, ntau yam hmoov sib txawv tungsten carbide hmoov tuaj yeem tsim tawm.
Thaum tungsten carbide hmoov thiab cov hlau sib xyaw ua ke thiab milled los tsim cemented carbide hmoov, ntau yam kev sib txuas tuaj yeem siv. Cov feem ntau cov cobalt cov ntsiab lus feem ntau yog 3% -25% (qhov hnyav piv). Yog tias nws tsim nyog los txhim kho qhov kev tiv thaiv corrosion ntawm cov cuab yeej, tom qab ntawd nickel thiab chromium yuav tsum tau ntxiv. Ntxiv rau, cov ntawv hlau yuav tuaj yeem txhim kho ntxiv los ntawm kev ntxiv lwm cov khoom siv sib xyaw. Piv txwv li, ntxiv ruthenium rau WC-Co cemented carbide tuaj yeem txhim kho nws txoj kev tawv tawv tsis tas txo nws qhov nyuaj. Ua kom cov ntsiab lus ntawm phau ntawv tuaj yeem tseem nce qhov tawv ntawm cov cemented carbide, tab sis nws yuav txo qhov nws cov tawv tawv.
Lub tuam txhab lag luam tsom rau kev lag luam aerospace, kev tub rog, kho mob, pib qhov chaw, cua zog tshiab lub zog thiab lwm qhov zoo siab tshuab tawg hniav kais laum tuam ntxhab, cov khoom lag luam tuaj yeem muab faib ua: tungsten stainless hlau, titanium alloy, tungsten steel, cemented carbide, kawg mills, Ntau hom carbide cov cuab yeej xws li CNC milling cutters, twist xyaum, thiab lwm yam.
