Vim li cas kev kho cua sov tsim nyog rau cov hlau cam khwb cia hlau?
Nyob rau hauv ductile cam khwb cia hlau, graphite yog spherical, thiab nws tsis muaj zog thiab kev puas tsuaj rau lub matrix yog tsis muaj zog tshaj li ntawm flake graphite. Cov khoom ntawm ductile cam khwb cia hlau feem ntau yog nyob ntawm tus qauv matrix, nrog graphite muaj qhov cuam tshuam thib ob. Txhim kho cov qauv matrix ntawm ductile cam khwb cia hlau los ntawm ntau yam kev kho cua sov tuaj yeem txhim kho nws cov khoom siv hluav taws xob kom sib txawv. Vim muaj cov yam ntxwv xws li tshuaj lom neeg muaj pes tsawg leeg, tus nqi txias, thiab spheroidizing cov neeg ua haujlwm, cov qauv sib xyaw ntawm ferrite, pearlite, cementite, thiab graphite feem ntau tshwm nyob rau hauv cov qauv cam khwb cia, tshwj xeeb tshaj yog nyob rau hauv nyias phab ntsa ntawm castings. Lub hom phiaj ntawm kev kho cua sov yog kom tau txais cov qauv xav tau, yog li txhim kho cov khoom siv kho tshuab.
Feem ntau siv cov kev kho cua sov rau cov hlau cam khwb cia yog raws li hauv qab no
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Tsawg-kub graphitization annealing: Kub kub 720 ~ 760℃. Ua kom txias hauv qhov cub kom qis dua 500℃thiab tom qab ntawd cua- txias. Qhov no decomposes cov eutectoid cementite, tau ductile cam khwb cia hlau nrog ib tug ferrite matrix, yog li txhim kho toughness.
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Kub kub graphitization annealing: 880 ~ 930 degree, ces cua sov rau 720 ~ 760℃thiab tuav. Ua kom txias hauv qhov cub kom qis dua 500℃thiab tom qab ntawd cua- cua txias. Qhov no tshem tawm cov qauv hlau cam khwb cia dawb, tau txais cov cam khwb cia hlau nrog ferrite matrix, txhim kho plasticity, txo hardness, thiab nce toughness.
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Tag nrho austenitizing normalizing: 880 ~ 930 degree, txoj kev txias: cua txias, cua txias, lossis cua txias. Txhawm rau txo kev ntxhov siab, cov txheej txheem tempering yog ntxiv: 500 ~ 600℃. Qhov no tau txais pearlite + me me ntawm ferrite + spheroidal graphite, txhim kho lub zog, hardness, thiab hnav tsis kam.
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Ua tsis tiav austenitizing normalizing: Cua sov mus rau 820 ~ 860 degree, txoj kev ua kom txias: cua txias, cua txias, lossis cua txias txias. Txhawm rau txo qhov kev ntxhov siab, cov txheej txheem tempering yog ntxiv: 500 ~ 600 degree, kom tau txais cov qauv pearlitic nrog me me ntawm cov ferrite dispersed, ua rau cov khoom siv zoo dua qub.
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quenching thiab tempering: cua sov mus rau 840 ~ 880 degree, txias txoj kev: roj los yog dej txias, tempering kub tom qab quenching: 550 ~ 600 degree, kom tau ib tug tempered sorbite qauv, kev txhim kho txhua yam khoom.
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Isothermal quenching: Cua sov rau 840 ~ 880 degree, quenching nyob rau hauv ib da dej ntsev ntawm 250 ~ 350 degree, kom tau cov khoom siv kho tshuab, tshwj xeeb tshaj yog kev txhim kho lub zog, toughness, thiab hnav tsis kam.
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Ceeb toom tshwj xeeb
Thaum lub sij hawm kho cua sov cua sov, lub cub tawg kub ntawm lub casting yog feem ntau tsawg dua 350 degree. Tus nqi cua sov nyob ntawm qhov loj thiab qhov nyuaj ntawm qhov casting, thiab xaiv ntawm 30 ~ 120℃/ h. Rau qhov loj thiab nyuaj, qhov cub nkag qhov kub yuav tsum qis, thiab cov cua kub yuav tsum qeeb. Cov cua kub kub nyob ntawm cov qauv matrix thiab tshuaj muaj pes tsawg leeg. Lub sijhawm tuav yog nyob ntawm cov phab ntsa casting thickness.
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Annealing kev kho ntawm ductile cam khwb cia hlau
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Lwm Txoj Kev
Tsis tas li ntawd, cov hlau nplaum hlau tuaj yeem ua rau tawv tawv siv siab - zaus, nruab nrab- zaus, los yog nplaim taws txoj kev kom ua tau siab tawv, hnav tsis kam, thiab qaug zog. Mos nitriding kuj tseem siv tau los txhim kho qhov hnav tsis kam ntawm cov castings.
Quenching thiab Tempering kho ntawm cov hlau cam khwb cia hlau Castings
Ductile cam khwb cia hlau castings, siv los ua bearings, yuav tsum tau hardness dua. Yog li ntawd, lawv feem ntau quenched thiab tempered ntawm tsawg kub. Cov txheej txheem suav nrog cua sov lub casting rau 860-900 degree, tuav nws ntawm qhov kub thiab txias kom tso cai rau cov matrix qub kom tag nrho austenitize, ces txias nws hauv roj los yog molten ntsev kom ua tiav quenching. Ua raws li qhov no, nws yog tempered ntawm 250-350 degree, hloov tus thawj matrix mus rau hauv tempered martensite thiab khaws cia austenite, thaum tus thawj spheroidal graphite morphology tseem tsis hloov. Cov kev kho castings muaj siab hardness thiab ib co℃ntawm toughness, tuav lub lubricating zog ntawm graphite, thiab exhibiting txhim kho hnav tsis kam.
Cov cam khwb cia hlau cam khwb cia hlau, siv los ua cov khoom sib txuas xws li crankshafts thiab txuas cov pas nrig hauv cov cav diesel, yuav tsum muaj lub zog siab thiab zoo tag nrho cov khoom siv kho tshuab, xav tau quenching thiab tempering kho. Cov txheej txheem yog raws li nram no: Cov cam khwb cia hlau qhov chaw yog rhuab mus rau 860-900℃thiab tuav ntawm qhov kub thiab txias rau austenitize matrix, ces quenched nyob rau hauv roj los yog molten ntsev, ua raws li los ntawm tempering ntawm 500-600℃kom tau ib tug tempered sorbite qauv (feem ntau nrog ib tug me me npaum li cas ntawm phemoroid graphalite ferrite) tsis hloov. Tom qab kev kho mob, lub zog thiab toughness yog qhov zoo sib xws, haum rau kev ua haujlwm ntawm cov ncej ncej.
Annealing ntawm Ductile Hlau los txhim kho Toughness
Ductile cam khwb cia hlau muaj kev nyiam ntau dua rau whiten dua li qub grey cam khwb cia hlau thaum lub sij hawm casting txheej txheem, thiab nws cov kev ntxhov siab sab hauv kuj tseem siab. Nws yog ib qho nyuaj kom tau txais ib qho ntshiab ferrite lossis pearlite matrix hauv cov hlau cam khwb cia. Txhawm rau txhim kho cov ductility lossis toughness ntawm cov hlau cam khwb cia, lawv feem ntau rov ua kom sov rau 900-950℃thiab tuav ntawm qhov kub ntawd rau lub sijhawm txaus rau siab -kub annealing, tom qab ntawd rauv-txias mus rau 600℃ua ntej raug tshem tawm ntawm lub qhov cub. Thaum lub sij hawm tus txheej txheem, cementite nyob rau hauv lub matrix decomposes rau hauv graphite, uas precipitates los ntawm austenite. Qhov no graphite accumulates nyob ib ncig ntawm tus thawj spheroidal graphite, thiab tag nrho cov matrix yog hloov mus rau hauv ferrite.
Yog hais tias cov cam khwb cia microstructure muaj xws li ib tug (ferrite + pearlite) matrix thiab spheroidal graphite, los txhim kho toughness, nws tsuas yog tsim nyog los decompose cov cementite nyob rau hauv pearlite rau ferrite thiab spheroidal graphite. Rau lub hom phiaj no, cov cam khwb cia hlau yog reheated rau ib ncig ntawm eutectoid kub ntawm 700-760 degree, tuav ntawm qhov kub thiab txias, thiab tom qab ntawd cub-txias rau 600℃ua ntej yuav raug tshem tawm ntawm lub cub tawg thiab txias ntxiv.
Normalizing los txhim kho lub zog ntawm Ductile Hlau
Lub hom phiaj ntawm normalizing ductile hlau yog los hloov cov matrix microstructure mus rau hauv ib tug zoo pearlite microstructure. Cov txheej txheem muaj xws li reheating ductile hlau castings nrog ib tug ferrite thiab pearlite matrix rau 850-900 degree. Thawj ferrite thiab pearlite hloov mus rau hauv austenite, thiab qee qhov spheroidal graphite dissolves rau hauv austenite. Tom qab kev txuag hluav taws xob thiab cua txias, lub austenite tau hloov mus rau hauv pearlite zoo, yog li ua kom lub zog ntawm cov hlau ductile castings.
Tuam txhab Taw Qhia
Shanxi Jintai Hongye Casting & Forging Machinery Co., Ltd., nyob rau hauv Shanxi Province, Suav teb, yog ib tug ua chaw tsim tshuaj paus ntawm ductile hlau yeeb nkab fittings, kav, ntau yam li qub, thiab lub kaus mom, ua tag nrho cov kev siv ntawm lub cheeb tsam muaj ntau raw cov ntaub ntawv.
Kev paub ua pov thawj
Ntau txhiab tus neeg siv khoom zoo siab, ntau pua tus neeg siv khoom ruaj khov yog qhov tshwm sim ntawm peb txoj haujlwm ..
pab neeg tshaj lij
Peb yuav muab cov lus qhia tsim nyog rau koj.
Ib qhov chaw nres tsheb
Peb xyuas kom meej tias koj cov khoom xa tuaj zoo thiab raws sijhawm.