Los kawm txog HSS
Cov hlau ceev ceev (HSS) yog cov hlau siv ua cuab yeej uas muaj qhov nyuaj siab, tiv taus kev hnav thiab tiv taus kub siab, tseem hu ua hlau cua lossis hlau ntse, txhais tau tias nws tawv txawm tias txias hauv huab cua thaum lub sijhawm quenching thiab ntse. Nws tseem hu ua hlau dawb.
Cov hlau ceev ceev yog cov hlau sib xyaw ua ke uas muaj cov khoom sib xyaw ua ke xws li tungsten, molybdenum, chromium, vanadium thiab cobalt. Tag nrho cov khoom sib xyaw ua ke muaj li ntawm 10 txog 25%. Nws tuaj yeem tswj tau qhov nyuaj siab hauv qab qhov kub siab (kwv yees li 500 ℃) thaum txiav ceev ceev, HRC tuaj yeem siab dua 60. Qhov no yog qhov tseem ceeb tshaj plaws ntawm HSS - qhov nyuaj liab. Thiab cov hlau cuab yeej carbon los ntawm kev quenching thiab tempering kub qis, ntawm chav tsev kub, txawm hais tias muaj qhov nyuaj siab heev, tab sis thaum qhov kub siab dua 200 ℃, qhov nyuaj yuav poob qis, hauv 500 ℃ qhov nyuaj tau poob rau qib zoo sib xws nrog lub xeev annealed, poob tag nrho lub peev xwm txiav hlau, uas txwv cov cuab yeej txiav hlau cuab yeej carbon. Thiab cov hlau ceev ceev vim qhov nyuaj liab zoo, los ua kom tiav rau qhov tsis zoo ntawm cov hlau cuab yeej carbon.
Cov hlau ceev ceev feem ntau yog siv los tsim cov cuab yeej txiav hlau uas nyias thiab tsis yooj yim rau kev cuam tshuam, tab sis kuj tseem siv los tsim cov bearings kub thiab cov pwm extrusion txias, xws li cov cuab yeej tig, cov laum, cov hob, cov hniav pom tshuab thiab cov pwm nyuaj.
Los kawm txog cov hlau tungsten
Tungsten hlau (carbide) muaj ntau yam khoom zoo heev xws li kev nyuaj siab, kev hnav tsis kam, lub zog zoo dua thiab kev tawv, kev tiv thaiv kub, kev tiv thaiv corrosion, thiab lwm yam. Tshwj xeeb tshaj yog nws qhov kev nyuaj siab thiab kev hnav tsis kam tseem tsis hloov pauv txawm tias ntawm qhov kub ntawm 500 ℃, thiab tseem muaj kev nyuaj siab ntawm 1000 ℃.
Tungsten hlau, uas nws cov khoom tseem ceeb yog tungsten carbide thiab cobalt, suav txog 99% ntawm tag nrho cov khoom thiab 1% ntawm lwm cov hlau, yog li nws hu ua tungsten hlau, tseem hu ua cemented carbide, thiab suav tias yog cov hniav ntawm kev lag luam niaj hnub.
Tungsten hlau yog ib yam khoom sib xyaw ua ke uas muaj tsawg kawg ib hom hlau carbide. Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide, thiab tantalum carbide yog cov khoom sib xyaw ua ke ntawm tungsten hlau. Qhov loj ntawm cov khoom carbide (lossis theem) feem ntau yog nyob rau hauv qhov ntau ntawm 0.2-10 microns, thiab cov carbide nplej raug sib txuas ua ke siv cov hlau binder. Cov hlau sib txuas feem ntau yog cov hlau pab pawg, feem ntau yog cobalt thiab nickel. Yog li muaj tungsten-cobalt alloys, tungsten-nickel alloys thiab tungsten-titanium-cobalt alloys.
Kev tsim cov tungsten sintering yog nias cov hmoov rau hauv ib lub billet, tom qab ntawd mus rau hauv lub cub tawg sintering kom sov nws mus rau qee qhov kub (qhov kub sintering) thiab khaws cia rau ib lub sijhawm (tuav lub sijhawm), thiab tom qab ntawd txias nws kom tau txais cov khoom siv hlau tungsten nrog cov yam ntxwv xav tau.
① Tungsten thiab cobalt cemented carbide
Cov khoom tseem ceeb yog tungsten carbide (WC) thiab binder cobalt (Co). Qib no yog tsim los ntawm "YG" ("tawv, cobalt" hauv Hanyu Pinyin) thiab feem pua ntawm cov ntsiab lus cobalt nruab nrab. Piv txwv li, YG8, uas txhais tau tias qhov nruab nrab WCo = 8% thiab qhov seem yog tungsten carbide cemented carbide.
② Tungsten, titanium thiab cobalt cemented carbide
Cov khoom tseem ceeb yog tungsten carbide, titanium carbide (TiC) thiab cobalt. Qib no muaj "YT" ("tawv, titanium" hauv Hanyu Pinyin) thiab cov ntsiab lus nruab nrab ntawm titanium carbide. Piv txwv li, YT15, txhais tau tias qhov nruab nrab TiC = 15%, qhov seem yog tungsten carbide thiab cov ntsiab lus cobalt ntawm tungsten titanium cobalt carbide.
③Tungsten-titanium-tantalum (niobium) carbide
Cov khoom tseem ceeb yog tungsten carbide, titanium carbide, tantalum carbide (lossis niobium carbide) thiab cobalt. Hom carbide no kuj hu ua general-purpose carbide lossis universal carbide. Qib muaj "YW" ("nyuaj" thiab "lab" hauv Hanyu Pinyin) ntxiv rau tus lej sib law liag, xws li YW1.
Tungsten hlau muaj ntau yam khoom zoo heev xws li kev tawv siab, kev hnav tsis kam, lub zog zoo dua thiab kev tawv, kev tiv taus kub, kev tiv taus corrosion, thiab lwm yam. Tshwj xeeb tshaj yog nws qhov kev tawv siab thiab kev hnav tsis kam tseem tsis hloov pauv txawm tias kub ntawm 500 ℃, thiab tseem muaj kev tawv siab ntawm 1000 ℃. Cemented carbide yog siv dav ua cov ntaub ntawv, xws li cov cuab yeej tig, cov cuab yeej milling, kev xyaum, cov cuab yeej tho qhov, thiab lwm yam. Qhov kev txiav ceev ntawm cov carbide tshiab yog sib npaug rau ntau pua npaug ntawm cov hlau carbon.
Lub sijhawm tshaj tawm: Lub Ob Hlis-21-2023
