Lub luag haujlwm ntawm kev kho cua sov yog txhawm rau txhim kho cov khoom siv ntawm cov yeeb nkab steel thiab precision steel kav, tshem tawm cov kev ntxhov siab seem, thiab txhim kho kev ua haujlwm ntawm cov yeeb nkab steel hlau. Raws li cov hom phiaj sib txawv, cov txheej txheem kev kho cua sov tuaj yeem muab faib ua ob pawg: npaj kev kho cua sov thiab kev kho cua sov kawg.
Lub hom phiaj ntawm qhov kawg kev kho cua sov yog los txhim kho cov khoom siv xws li hardness, abrasion tsis kam thiab lub zog.
(1) quenching
Lub quenching muaj nto quenching thiab zuag qhia tag nrho quenching. Qhov saum npoo quenching yog dav siv vim deformation, oxidation thiab decarburization, thiab nto quenching kuj muaj qhov zoo ntawm sab nraud lub zog thiab zoo abrasion tsis kam, thaum lub sab hauv tuav zoo 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 kev kho kom zoo lossis hluav taws kub zoo yog feem ntau yuav tsum tau ua raws li kev npaj kho cua sov. Cov txheej txheem dav dav yog: pub-forging-forward hluav taws (annealing)-Rough processing-quality adjustment-semi-precision processing-surface quenching-precision processing.
(2) Carburizing quenching
Crystal carburizing quenching yog tsim rau qis-carbon steel thiab qis alloy steel. Ua ntej nce cov ntsiab lus carbon ntawm txheej txheej ntawm qhov chaw. Tom qab quenching, txheej txheej tau siab hardness, thiab lub plawv tseem tuav ib tug tej lub zog thiab siab toughness thiab plasticity. Carbilide muab faib ua tag nrho carburizing thiab hauv zos carburizing. Thaum lub hauv paus carburization yuav tsum tau coj los tiv thaiv kev ntsuas (tooj liab plating los yog cov khoom tiv thaiv-seepage). Vim tias cov carburizing quenching deformation yog loj, thiab qhov tob ntawm carburizing feem ntau yog nyob nruab nrab ntawm 0.5 thiab 2mm, cov txheej txheem carburizing feem ntau yog npaj ntawm semi-essence thiab precision ua.
Nws cov txheej txheem txoj kev yog feem ntau: pub-forging-forward hluav taws-tuab, semi-essence ua-carburizing quenching-precision ua.
Tom qab qhov tsis yog-carburizing ib feem ntawm lub hauv paus carburizing ib feem yog nce, cov txheej txheem ntawm cov pa roj carbon ntau yuav tsum tau teem caij thaum cov txheej txheem carburizing tshaj tawm thaum cov txheej txheem carburizing tshaj tawm.
(3) Nitrogen seepage kho
Nitrogen yog ib txoj kev kho rau nitrogen atoms rau hauv cov hlau nto kom tau ib txheej ntawm nitrogen-muaj compound. Cov txheej nitrogen seepage tuaj yeem txhim kho qhov hardness, abrasion tsis kam, qaug zog thiab corrosionability ntawm qhov chaw. Vim tias qhov kub ntawm nitrogen seepage tsis tshua muaj, qhov deformed deformation, thiab cov txheej txheem nitrogen seepage (feem ntau tsis ntau tshaj 0.6 ~ 0.7mm), cov txheej txheem nitrogen seepage yuav tsum tau npaj. ntau li ntau tau. Tsim kom muaj qhov kub siab rov qab los ntawm kev ntxhov siab.
