Lub luag haujlwm ntawm kev kho cua sov aluminium yog txhawm rau txhim kho cov khoom siv kho tshuab ntawm cov khoom siv, tshem tawm cov kev ntxhov siab seem thiab txhim kho kev ua haujlwm ntawm cov hlau.Raws li cov hom phiaj sib txawv ntawm kev kho cua sov, cov txheej txheem tuaj yeem muab faib ua ob pawg: kev kho preheat thiab kev kho cua sov kawg.
Lub hom phiaj ntawm kev kho preheat yog txhawm rau txhim kho kev ua haujlwm, tshem tawm cov kev ntxhov siab sab hauv thiab npaj cov qauv metallographic zoo rau kev kho cua sov kawg.Nws cov txheej txheem kho cua sov muaj xws li annealing, normalizing, laus, quenching thiab tempering thiab lwm yam.
1) Kev kho mob thiab normalizing
Annealing thiab normalizing yog siv rau kub-ua hauj lwm aluminium blank khoom.Cov pa roj carbon steel thiab alloy steel nrog cov ntsiab lus carbon ntau dua 0.5% feem ntau yog annealed thiaj li yuav txo tau lawv hardness thiab yooj yim txiav;carbon steel thiab alloy steel nrog cov ntsiab lus ntawm cov pa roj carbon tsawg dua 0.5% yog siv kom tsis txhob lo rau riam thaum lub hardness tsawg dhau.Thiab siv cov tshuaj normalizing.Annealing thiab normalizing tseem tuaj yeem kho cov nplej thiab cov qauv sib xws, thiab npaj rau kev kho cua sov tom ntej.Annealing thiab normalizing feem ntau yog txheej txheem tom qab qhov khoob yog tsim thiab ua ntej machining ntxhib.
2) Kev laus kev kho mob
Kev laus kev kho mob feem ntau yog siv los tshem tawm cov kev ntxhov siab sab hauv uas tsim los ntawm kev tsim khoom thiab machining.
Txhawm rau kom tsis txhob muaj kev thauj mus los ntau dhau, rau qhov chaw uas muaj qhov tseeb, nws txaus los npaj ib qho kev kho mob ua ntej ua tiav.Txawm li cas los xij, rau qhov chaw uas muaj qhov yuav tsum tau muaj siab, xws li lub thawv ntawm lub tshuab jig tho txawv, thiab lwm yam, yuav tsum tau npaj ob lossis ob peb txoj kev kho kev laus.Tej yam yooj yim feem ntau tsis tas yuav kho kev laus.
Ntxiv nrog rau cov castings, rau qee qhov precision nrog tsis zoo rigidity, xws li precision ntsia hlau, txhawm rau tshem tawm cov kev ntxhov siab sab hauv tsim thaum ua thiab ua kom ruaj khov ntawm cov khoom raug, ntau yam kev laus kev kho mob feem ntau yog teem ntawm ntxhib machining thiab semi-tiav.Rau qee qhov chaw, kev laus yuav tsum tau teem caij tom qab cov txheej txheem ncaj.
3) quenching thiab tempering
quenching thiab tempering yog hais txog qhov kub thiab txias tom qab quenching.Nws tuaj yeem tau txais cov qauv zoo sib xws thiab tempered sorbite, uas yog kev npaj rau kev txo qis deformation thaum lub sij hawm deg quenching thiab nitriding kho.Yog li ntawd, quenching thiab tempering kuj siv tau raws li kev kho mob preheat.
Vim tias muaj cov khoom siv zoo dua qub ntawm cov quenching thiab tempering qhov chaw, nws kuj tuaj yeem siv los ua cov txheej txheem kho cua sov zaum kawg rau qee qhov uas tsis tas yuav tsum muaj siab hardness thiab hnav tsis kam.
Lub hom phiaj ntawm kev kho cua sov zaum kawg yog txhawm rau txhim kho cov khoom siv kho tshuab xws li hardness, hnav tsis kam thiab lub zog.Nws cov txheej txheem kho cua sov suav nrog quenching, carburizing thiab quenching, thiab kev kho nitriding.
1) Quenching
quenching yog muab faib ua nto quenching thiab zuag qhia tag nrho quenching.Ntawm lawv, nto quenching yog dav siv vim nws qhov me me deformation, oxidation thiab decarburization, thiab nto quenching kuj muaj qhov zoo ntawm sab nraud lub zog thiab zoo hnav tsis kam, thaum tuav zoo hauv toughness thiab muaj zog tiv thaiv.Txhawm rau txhim kho cov khoom siv hluav taws xob ntawm qhov chaw quenching, kev kho cua sov xws li quenching thiab tempering los yog normalizing feem ntau yuav tsum tau ua raws li kev kho cua sov ua ntej.Nws cov txheej txheem dav dav yog: blanking, forging, normalizing, annealing, ntxhib machining, quenching thiab tempering, semi-tiav, nto quenching, xov.
2) Carburizing thiab quenching
Carburizing thiab quenching yog ua kom cov pa roj carbon ntsiab lus ntawm txheej txheej ua ntej, thiab tom qab quenching, txheej txheej tau txais cov hardness siab, thaum lub hauv paus tseem muaj qee lub zog thiab siab toughness thiab plasticity.Carburizing muab faib ua tag nrho carburizing thiab ib nrab carburizing.Thaum ib nrab carburizing tau ua tiav, kev ntsuas los tiv thaiv cov dej yuav tsum tau coj mus rau qhov tsis yog carburizing.Txij li thaum lub carburizing thiab quenching ua rau loj deformation, thiab carburizing qhov tob yog feem ntau ntawm 0.5 thiab 2 hli, cov txheej txheem carburizing feem ntau yog npaj ntawm semi-tiav thiab xov.
Cov txheej txheem feem ntau yog: blanking, forging, normalizing, ntxhib machining, semi-tiav, carburizing thiab quenching, xov.Thaum qhov tsis-carburized ib feem ntawm carburizing thiab quenching ib feem tau txais cov txheej txheem ntawm kev tshem tawm cov txheej txheem carburized ntau dua tom qab nce cov npoo, cov txheej txheem tshem tawm cov txheej carburized ntau dhau yuav tsum tau teem caij tom qab carburizing thiab quenching, ua ntej quenching.
3) Kev kho nitriding
Nitriding yog txheej txheem ntawm infiltrating nitrogen atoms mus rau hauv ib tug hlau nto kom tau ib txheej ntawm nitrogen-muaj compounds.Cov txheej nitriding tuaj yeem txhim kho qhov hardness, hnav tsis kam, qaug zog lub zog thiab corrosion kuj ntawm qhov chaw.Txij li thaum cov nitriding kev kho kub yog tsawg, lub deformation yog me me, thiab cov nitriding txheej yog nyias, feem ntau tsis ntau tshaj 0.6 ~ 0.7 hli, cov txheej txheem nitriding yuav tsum tau teem caij lig li sai tau.Txhawm rau txo qhov deformation thaum lub sij hawm nitriding, nws feem ntau yuav siv sij hawm kub tempering rau kev ntxhov siab.
Kho los ntawm May Jiang los ntawm MAT Alumin
Post lub sij hawm: Sep-04-2023
