Tsev cog khoom Qhov rai iav PM Sintered Part
Powder metallurgy iav yog ib qho tseem ceeb ntawm cov khoom sib kis thiab cov ntsiab lus tseem ceeb ntawm kev xa hluav taws xob. Yog li ntawd, hmoov metallurgy iav yuav tsum muaj cov yam ntxwv ntawm siab hardness, siab zog, thiab siab ceev. Yuav ua li cas los txhim kho lub hardness thiab lub zog ntawm hmoov metallurgy iav los ntawm kev kho cua sov yog qhov tsim nyog txuas rau hauv kev tsim thiab ua cov hmoov metallurgy iav.
Khoom Taw Qhia
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Tsev cog khoom qhov rais iav PM sintered ib feem |
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Yam khoom |
Khoom siv |
Txheej txheem ntau lawm |
Sintering kub |
Pwm |
Kev cai |
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Tsev cog khoom qhov rais iav |
440c |
Hlau Txhaj Molding |
1550 degree |
Yuav tsum customized |
Yog lawm |
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Tshuaj muaj pes tsawg leeg |
C :0.95-1.20 Si: Tsawg dua lossis sib npaug rau 1.00 Mn: Tsawg dua lossis sib npaug rau 1.00 S : Tsawg dua lossis sib npaug rau 0.030 P : Tsawg dua lossis sib npaug rau 0.035 Cr:16. {1}} {2}} Ni: tso cai kom muaj tsawg dua lossis sib npaug rau 0.60 |
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Cov ntaub ntawv muaj |
Tsawg carbon stainless hlau, titanium alloy (Ti, TC4), tooj liab alloy, tungsten alloy, nyuaj alloy, kub kub alloy (718, 713) |
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Khoom zoo
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Smoothness |
Dimensional raug |
Khoom ntom ntom |
Cov tsos mob kho |
Tsim nyog hnyav |
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Roughness 1-5μm |
± {{0}}.1 feem pua -±0.5 feem pua ) |
92-95 feem pua |
Daim iav reflection |
0.03g-400g） |
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Mechanical zog |
Hardness: annealed, Tsawg dua los yog sib npaug rau 269HB; quenching thiab tempering, Ntau dua los yog sib npaug rau 58HRC Mechanical cwj pwm: Kev ntxhov siab sab hauv (250 N / mm2) Tensile zog (560 N / mm2) EL(18%) HB(250) |
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Kev kho cua sov |
1) Annealing, qeeb txias ntawm 800-920 degree ; 2) quenching, roj txias ntawm 1010-1070 degree; 3) Tempering, ceev txias ntawm 100-180 degree; 4. Preheating kub, 649 degree -816 degree . |
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Txoj kev kho cua sov
Powder metallurgy iav yog ib qho tseem ceeb ntawm cov khoom sib kis thiab cov ntsiab lus tseem ceeb ntawm kev xa hluav taws xob. Yog li ntawd, hmoov metallurgy iav yuav tsum muaj cov yam ntxwv ntawm siab hardness, siab zog, thiab siab ceev. Yuav ua li cas los txhim kho lub hardness thiab lub zog ntawm hmoov metallurgy iav los ntawm kev kho cua sov yog qhov tsim nyog txuas rau hauv kev tsim thiab ua cov hmoov metallurgy iav.
Cov hmoov hlau metallurgy, zoo li lwm yam khoom siv hlau, tuaj yeem txhim kho lawv cov khoom siv hluav taws xob los ntawm kev kho cua sov. Cov txheej txheem kev kho cua sov siv hauv cov hmoov hlau metallurgy muaj xws li annealing, normalizing, quenching, tempering, thiab carburizing, nitriding, thiab carbonitriding. Cov txheej txheem no tuaj yeem ua tau zoo heev txhim kho cov khoom siv ntawm cov hmoov iav, tab sis vim yog qhov tshwj xeeb ntawm cov hmoov hlau metallurgy, thaum xaiv cov txheej txheem kev kho cua sov thiab cov txheej txheem txheej txheem, cov ntaub ntawv ntom ntom tsis tuaj yeem raug xa mus rau tag nrho, thiab kev hloov kho tsim nyog yuav tsum tau ua kom haum cov hmoov. metallurgy iav. Txwv tsis pub, cov nyhuv ntawm kev kho cua sov yuav tsis tau, thiab txawm tias kev puas tsuaj yuav tshwm sim. Cov ntaub ntawv uas siv kev kho cua sov los txhim kho kev ua haujlwm ntawm cov hmoov hlau metallurgy yog cov hlau-raws li alloys (sintered steel).
Cov ntsiab lus hauv qab no yuav tsum tau them sai sai rau hauv kev kho cua sov ntawm hmoov metallurgy iav sintered steel:
1. Cov voids ntawm sintered steel muaj kev ua haujlwm ntawm cov rwb thaiv tsev kub. Yog li ntawd, piv nrog tuab hlau, sintered steel muaj tsawg thermal conductivity, thiab nws yog ib qho nyuaj rau dissipate tshav kub, ua rau tsis zoo hardenability.
2. Kev cuam tshuam ntawm microstructure uniformity ntawm austenitization, microstructure uniformity ntawm sintered steel yog deteriorated los ntawm cov yam ntxwv xws li kev faib tsis sib xws ntawm carbon. Qhov kub thiab lub sij hawm rau homogenization ntawm nws cov austenite yog ntau dua li cov hlau ntom, thiab nyob rau hauv tib lub sijhawm, lub sijhawm ua kom tiav homogenization yog 50 feem pua siab dua. Yog hais tias alloying ntsiab ntxiv rau sintered steel, homogenization kub yuav siab dua thiab lub sij hawm yuav ntev dua.
3. Cov nyhuv ntawm voids ntawm cov ntsiab lus carbon. Vim tias muaj qhov pores hauv sintered steel, yog tias nws raug kho tib yam li cov hlau ntom ntom, oxidation thiab decarburization yuav tshwm sim thaum lub sijhawm kho. Yog li ntawd, kev kho cua sov ntawm sintered steel uas muaj 6 feem pua qhov pores yuav tsum tau ua nyob rau hauv ib qho chaw tiv thaiv los yog embedded nyob rau hauv cov khoom fillers (xws li decomposed ammonia, natural gas conversion gas, charcoal, cam khwb cia hlau chips, thiab lwm yam). Tsis tas li ntawd, vim muaj qhov pores thiab qhov ntom ntom tsis sib xws, nws yooj yim los ua kom tawg tawg thiab deformation.
Muaj ntau txoj kev kho cua sov rau cov hmoov metallurgy iav:
1. Annealing thiab normalizing, annealing thiab normalizing yog cov txheej txheem npaj thaum tshav kub kub siv nyob rau hauv zus tau tej cov sintered steel. Lub hom phiaj ntawm annealing thiab normalizing yog kom tshem tawm cov kev ntxhov siab sab hauv, kho cov qauv ntawm cov khoom, yog li kho cov khoom siv thiab cov txheej txheem ntawm cov hlau, thiab npaj cov qauv thiab cov khoom rau cov txheej txheem tom ntej, xws li repressing, shaping, txiav, lwm yam Annealed. Rau cov khoom siv kho tshuab nrog tsawg thov siv, cov khoom siv annealed thiab normalized tuaj yeem siv los ua cov khoom tiav.
2. quenching, cov txheej txheem kev kho cua sov ntawm cov cua sov ntawm cov hlau sintered mus rau qhov kub siab tshaj qhov tseem ceeb, cua txias rau cov qauv martensitic ntawm qhov cua txias ntau dua qhov tseem ceeb tom qab kev txuag hluav taws xob yog hu ua quenching. Quenching yog txoj kev kho cua sov tshaj plaws rau sintered steel. Cov qauv martensitic tau los ntawm quenching tuaj yeem txhim kho lub zog, hardness thiab hnav tsis kam ntawm sintered steel. Lub hauv paus ntsiab lus quenching thiab txheej txheem ntawm sintered steel yog qhov zoo ib yam li cov hlau ntom ntom. Qhov txawv yog tias quenching txheej txheem ntawm sintered steel yuav tsum tau nqa tawm nyob rau hauv ib tug nruab nrab los yog carburizing cua los tiv thaiv oxidation ntawm pore nto. Vim lub qhov pore yam ntxwv ntawm sintered steel, roj quenching feem ntau yog siv, thiab cov txheej txheem quenching muaj xws li cua sov austenitization, quenching thiab tempering.
3. Tempering, tempering yuav tsum tau ua tom qab quenching. Tempering yog txheej txheem kev kho cua sov uas quenched steel yog rhuab mus rau qhov kub siab tshaj 780 degree thiab tom qab ntawd txias rau hauv chav tsev kub hauv qhov tsim nyog tom qab kev txuag hluav taws xob. Muaj ob lub hom phiaj ntawm tempering, ib qho yog tshem tawm cov kev ntxhov siab sab hauv thiab txo cov brittleness ntawm cov khoom. Tempering tau muab faib ua qhov kub thiab txias, nruab nrab kub tempering thiab kub tempering.
Ntau qhov chaw hardening kev kho mob ntawm cov hmoov metallurgy iav:
1. Carburizing saum npoo ntawm hmoov metallurgy iav tuaj yeem txhim kho qhov tawv tawv ntawm nws qhov chaw. Carburizing yog siv cov pa roj carbon monoxide, kua lossis khoom ua cov khoom siv carburizing kom diffuse carbon atoms mus rau saum npoo ntawm qhov chaw thiab hnov mob nrog hlau ntawm qhov kub thiab txias los tsim ntau cementite Fe3C. Qhov siab dua ntawm carburizing, ntau npaum li cas ntawm cementite tsim, thiab siab dua qhov tob thiab qhov tawv tawv ntawm carburized txheej. Qhov kev txhawj xeeb carburizing yog qhov tob thiab hardness ntawm carburized txheej. Qhov tob ntawm txheej carburized feem ntau yog 0.5-2.5mm. Qhov teeb meem tseem ceeb hauv carburizing hmoov metallurgy iav qhov chaw yog lub hardness ntawm carburized txheej. Vim muaj cov pores nyob rau hauv cov hlau-raws li hmoov, carbon atoms yuav diffuse mus rau sab hauv ntawm ib feem los ntawm lub pores, thiab ib tug ntshiab carburized txheej tsis tuaj yeem tsim, thiab ntau cov pa roj carbon diffusion mus rau sab hauv yuav ua rau kom lub brittleness ntawm qhov chaw. , thiab tsis tuaj yeem exert high deg hardness thiab Internal muaj zog, siab toughness yam ntxwv. Yog li ntawd, qhov chaw uas muaj porosity siab tsis haum rau carburizing.
Carburizing feem ntau yog ua los ntawm qhov kub siab tshaj 740 degree. Rau cov hlau-raws li qhov chaw nrog porosity tsawg dua 10 feem pua, qhov zoo tshaj plaws carburizing kub yog 920-940 degree . Qhov qis dua qhov kub ntawm carburizing, qhov deflection tsawg dua ntawm qhov. Yog li ntawd, nyob rau hauv cov ntaub ntawv ntawm high precision yuav tsum, uas tsis muaj kub carburizing ntawm 860 degree yuav tsum tau siv. Quenching feem ntau yog ua tom qab carburizing kom tau ib tug ntau dua hardness martensitic qauv ntawm qhov chaw. Muaj ob txoj hauv kev quench carburizing thiab quenching. Ib qho yog quenching ncaj qha, uas yog, ncaj qha roj quenching tom qab txias rau 750-850 degree . Cov qauv tau txais los ntawm txoj kev no yog qhov ntxhib, vim tias cov nplej austenite tau coarsened hauv carburizing, thiab cov khoom siv kho tshuab raug txo; Lwm txoj kev yog ua ntej Lub carburized iav yog txias, thiab ces quenched los ntawm cov txheej txheem quenching ntawm sintered steel. Txoj kev no tuaj yeem kov yeej qhov kev txiav txim siab ncaj qha quenching thiab tau txais cov hmoov hlau metallurgy nrog kev ua haujlwm zoo dua.
2. Iav nto nitriding, nitriding yog cov txheej txheem uas nitrogen-muaj roj tiv tauj sintered steel, nitrogen atoms diffuse rau saum npoo ntawm sintered steel, thiab reacts nrog alloying ntsiab chromium, txhuas, molybdenum, npib tsib xee, thiab tungsten nyob rau hauv cov hlau tsim. nitrides. Tom qab nitriding, qhov hardness ntawm qhov chaw yog ntxiv txhim kho. Nitriding tuaj yeem nqa tawm ib leeg lossis carbonitriding. Cov txheej txheem ntawm nitriding yog nce lub iav mus rau qhov kub ntawm 495-565 degree, dhau los ntawm ammonia roj, thiab cov nquag nquag nitrogen atoms decomposed los ntawm ammonia roj yuav desalinate nto ntawm qhov chaw. Qhov nyuaj tshaj plaws rau hmoov metallurgy iav nitriding yog porosity. Ntau qhov pores tsis tuaj yeem tsim cov txheej nitrided, thiab tsim cov nitrides hauv cov iav yuav ua rau qhov nkig.
3. Carbonitriding, uas yog, cov pa roj carbon thiab nitrogen tau tob tob rau hauv cov hmoov hlau metallurgy iav tib lub sijhawm, uas ntxiv dag zog rau qhov hardness thiab hnav tsis kam ntawm qhov chaw ntawm qhov chaw. Cov txheej txheem ntawm carbonitriding yog ntxiv ammonia thaum lub sij hawm carburizing txheej txheem, yog li ntawd nitrogen kuj infiltrated thaum cov pa roj carbon ntxaum. Qhov kub ntawm carbonitriding yog qis dua tus neeg carburizing (kwv yees li 55 degree qis), thiab lub sij hawm luv dua. Qhov ceev ntawm carbonitriding yuav tsum tau khaws cia ntawm 6.85g / cm³, uas yog zoo heev rau brazing thiab siab ceev (7.2g / cm³).
4. High-frequency quenching, hmoov metallurgy iav high-frequency quenching yog ib txoj kev ntawm quenching nto ntawm lub workpiece, uas yog, lub workpiece yog muab tso rau hauv lub coil, thiab lub high-frequency quenching tam sim no. Nyob rau hauv qhov kev txiav txim ntawm alternating magnetic teb generated los ntawm high-frequency tam sim no, nto ntawm lub workpiece yuav tsim induced electromotive quab yuam thiab eddy tam sim no. Vim yog cov nyhuv ntawm daim tawv nqaij, qhov induced eddy tam sim no feem ntau yog concentrated nyob rau saum npoo ntawm lub workpiece, uas generates kub ntawm qhov chaw. High-frequency quenching yog siv lub hauv paus ntsiab lus ntawm cua sov kom sai sai ntawm qhov chaw ntawm lub workpiece mus rau qhov kub thiab txias, thiab ces quench nws kom tau ib tug nto quenched qauv. Ib qho tseem ceeb ntawm cov hmoov hlau metallurgy iav uas yuav tsum tau hnav tsis kam txais cov txheej txheem kev kho cua sov ntawm high zaus quenching. Thaum cov hmoov metallurgy iav txais cov txheej txheem kev kho cua sov ntawm high-frequency quenching, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau qhov ceev ntawm lub iav nws tus kheej. Qhov ceev yuav tsum ncav cuag 6.85g / cm³, kom lub zog ntawm lub iav nws tus kheej tuaj yeem ua tiav, thiab kev ntxhov siab yuav raug tsim los ntawm cov cua sov hauv zos thiab tsis muaj cua sov, thiaj li tsis ua rau cov khoom tawg. ua
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