Khoom ntawm Hniav

Cov ntaub ntawv siv hniav siv ntau tshaj plaws hauv kev lag luam riam riam yog kwv yees faib ua plaub hom: cemented carbide (TC), kev kub ceev hlau (HSS) thiab Cr12MoV (D2, los yog SKD11) thiab 9CrSi. Feem ntau, kev xaiv cov khoom siv hniav siv feem ntau muaj nws tus kheej kev lag luam. Piv txwv li, cov riam loj loj yog tsim rau Cr12MoV, thiab rab riam xuas nrig yog tsim rau 9CrSi. Cov riam me me yog tsim rau siab - ceev steel, thiab lwm yam. Cov ntaub ntawv tsim nyog no yog tus nqi tshaj - siv tau zoo.

Cemented carbide tseem hu ua TC, vim hais tias lub ntsiab ntawm cov cemented carbide yog tungsten carbide. Cemented carbide muaj cov khoom zoo heev xws li siab hardness, hnav tsis kam, zoo zog thiab toughness, kub tsis kam thiab corrosion kuj. Hauv particular, nws muaj siab hardness thiab hnav tsis kam. Qhov kub yog qhov zoo ib yam ntawm 500 degree thiab tseem muaj siab hardness ntawm 1000 degree.

Cemented carbide yog ib yam khoom siv hlau, uas yog siv los txiav cov hlau tsis yog - ferrous hlau, iav, pob zeb thiab cov hlau zoo tib yam. Nws tseem tuaj yeem siv los txiav cov ntaub ntawv nyuaj xws li cua sov - resistant steel, stainless hlau thiab cov cuab yeej hlau. Txawm li cas los xij, vim nws tus nqi siab, feem ntau cov tuam txhab lag luam yuav muab qhov tseem ceeb rau siab - ceev steel ntawm qhov chaw ntawm kev tswj xyuas cov hniav zoo.

HSS yog cov ntawv luv ntawm English high speed steels, thiab cov npe suav suav yog kev kub ceev steel. Kev kub ceev steel yog ib qho khoom siv rau kev tsim cov cuab yeej txiav thiab pwm, tseem hu ua cov hlau pem hauv ntej, Nws txhais tau hais tias thaum lub sij hawm quenching [1], nws tuaj yeem tawv txawm tias txias hauv huab cua thiab ntse heev. Nws yog cov hlau alloy uas muaj cov khoom sib txuam, uas yog tsim los ntawm cov ntsiab lus carbide xws li tungsten, molybdenum, chromium, vanadium thiab cobalt. Tag nrho cov ntsiab lus ntawm alloy yog hais txog 10 ~ 25 %. Nws muaj peev xwm tuav tau siab hardness thiab Rockwell hardness nyob rau hauv cov kev mob ntawm high kub generated los ntawm siab - ceev txiav (li 500 degree) (HRC) yuav ua tau siab tshaj 60, uas yog lub ntsiab yam ntxwv ntawm siab - ceev steel - liab hardness [2]. Yog li ntawd, nws yog qhov tsim nyog rau kev tsim cov cuab yeej txiav.

Lus Cim: quenching [1]: Tom qab lub workpiece yog rhuab thiab insulated, nws yog sai txias nyob rau hauv dej, roj los yog lwm yam inorganic ntsev, organic aqueous daws thiab lwm yam quenching xov xwm. Tom qab quenching, steel qhov chaw yuav nyuaj thiab nkig tib lub sijhawm.

Liab hardness [2]: yog hais txog lub peev xwm ntawm cov khoom siv los tswj nws qhov hardness tom qab tuav nws ntawm qhov kub thiab txias rau ib lub sijhawm. Txhawm rau kom ntseeg tau tias nws cov tawv tawv liab, carbide tsim cov ntsiab lus xws li W, Mo, Cr thiab V yuav tsum tau ntxiv rau siab - ceev steel.

Cr12MoV (lub npe thoob ntiaj teb tus qauv D2, tseem hu ua SKD11) SKD11 yog Japanese cuab yeej steel hom, Cr12MoV yog ib tug zoo tib yam txias ua hauj lwm tuag steel nrog zoo hnav tsis kam, yog ib tug alloy cuab tam steel, tsis muaj siab - ceev cuab yeej steel, thiab yog siv rau kev kho cua sov ntawm cov ntaub ntawv tuag, uas tuaj yeem ncav cuag hrc58 - 60. Nws yog tsim rau kev tsim ntau yam txias txias thiab cov cuab yeej stamping tuag nrog cov ntoo khaub lig loj - ntu, cov duab tsis zoo thiab cov cuab yeej ua haujlwm tsis zoo, trimming dies, yeeb nkab tuag, steel sib sib zog nqus daim duab tuag, ncig pom hniav, txheem cov cuab yeej thiab ntsuas cov cuab yeej, xov dov, thiab lwm yam. Nws yog tsim rau txias extrusion, tensile zaj duab xis, npias stainless hlau, thiab lwm yam. nws muaj zoo quenching kev kawm thiab me me quenching deformation. Nws yog qhov tsim nyog tshaj plaws rau kev tuag raug. Nws muaj qhov zoo ntawm qhov kub thiab txias zog, toughness thiab kub qaug zog ua haujlwm. Nws tuaj yeem tiv taus kev hloov pauv ntawm qhov kub thiab txias. Nws yog qhov tsim nyog rau kev ua haujlwm ntawm qhov kub thiab txias rau lub sijhawm ntev. Nws muaj kev ua haujlwm zoo heev thiab kev ua haujlwm polishing.

9CrSi kuj tseem yog cov cuab yeej hlau alloy. Nws yog cov cuab yeej siv qis qis qis thiab tuaj yeem siv rau qis - ceev txiav cov cuab yeej. Nws muaj siab hardenability thiab hardenability, siab tempering stability thiab nto quenching tshav kub rhiab heev. Yog tias cov khoom siv 9CrSi tuaj yeem kho cua sov, nws cov nqi thov yuav raug txhim kho rau qee yam. Cov khoom no yog tsim rau crushing ntau nkig khoom nrog tsawg yuav tsum tau.

Ordinary alloy tool steel feem ntau ua haujlwm ntawm qhov kub ntawm 180 degree - 250 degree, thaum siab - ceev cov cuab yeej hlau tseem tuaj yeem tswj tau siab hardness ntawm kev ua haujlwm kub txog 600 degree. Nyob rau hauv txoj kev no, siab - ceev cov cuab yeej steel yog yuav luag ib qho kev hloov kho ntawm cov cuab yeej hlau, tab sis cov cuab yeej hlau hlau muaj qhov hnav tsis kam thiab zoo toughness tom qab quenching, yog li kuv xav tias cov ntaub ntawv sib txawv muaj lawv cov kev siv zoo tshaj plaws, thiab tsis muaj qhov zoo. los yog phem.