Kev tswj hwm zoo ntawm cov txheej txheem smelting thiab casting aluminium alloy: kev tshuaj xyuas tag nrho ntawm 6063 aluminium alloy kev taw qhia.

Kev tswj cov khoom sib xyaw ntawm cov hlau txhuas yog qhov tseem ceeb rau kev ua kom cov khoom siv ua haujlwm tau zoo. Hauv cov txheej txheem tsim khoom ntawm 6063 hlau txhuas, ntxiv rau kev tswj cov ntsiab lus ntawm cov hlau tseem ceeb, xws li qhov sib piv ntawm magnesium thiab silicon, cov ntsiab lus tsis huv xws li hlau, tooj liab, manganese, thiab lwm yam kuj yuav tsum tau tswj hwm nruj me ntsis. Txawm hais tias cov ntsiab lus no muaj qhov cuam tshuam me ntsis rau cov khoom sib xyaw hauv cov nqi me me, thaum lawv tshaj qhov txwv, lawv yuav cuam tshuam loj heev rau cov khoom siv kho tshuab thiab kev tiv thaiv corrosion ntawm cov khoom siv. Tshwj xeeb tshaj yog zinc, yog tias nws cov ntsiab lus tshaj 0.05%, cov pob dawb yuav tshwm sim ntawm qhov chaw ntawm qhov profile tom qab oxidation, yog li kev tswj cov ntsiab lus zinc yog qhov tseem ceeb heev.

Cov tshuaj lom neeg ntawm 6063 txhuas alloy yog raws li GB / T5237-93 tus qauv, uas feem ntau suav nrog 0.2-0.6% silicon, 0.45-0.9% magnesium thiab txog li 0.35% hlau. Cov hlau no yog cov hlau kho cua sov uas muaj zog, thiab nws theem txhawb zog tseem ceeb yog Mg2Si. Thaum lub sijhawm quenching, qhov ntau ntawm cov khoom khov Mg2Si txiav txim siab lub zog kawg ntawm cov hlau. Qhov kub eutectic yog 595 ° C. Lub sijhawm no, qhov siab tshaj plaws solubility ntawm Mg2Si yog 1.85%, uas poob rau 1.05% ntawm 500 ° C. Qhov no qhia tau hais tias kev tswj hwm ntawm qhov kub quenching yog qhov tseem ceeb rau lub zog ntawm cov hlau. Tsis tas li ntawd, qhov piv ntawm magnesium rau silicon hauv cov hlau muaj qhov cuam tshuam loj rau qhov solubility ntawm Mg2Si. Yuav kom tau txais cov hlau muaj zog siab, nws yog qhov tsim nyog los xyuas kom meej tias qhov piv ntawm Mg: Si tsawg dua 1.73.

Kev smelting yog cov txheej txheem tseem ceeb hauv kev tsim cov pas nrig zoo. Qhov kub yaj ntawm 6063 txhuas alloy yuav tsum tau tswj hwm nruj ntawm 750-760 ° C. Qhov kub qis dhau yuav ua rau muaj cov slag inclusions, thaum qhov kub siab dhau yuav ua rau muaj kev pheej hmoo ntawm hydrogen absorption, oxidation thiab nitriding. Qhov solubility ntawm hydrogen hauv cov kua txhuas nce siab dua 760 ° C. Yog li ntawd, kev tswj qhov kub yaj yog qhov tseem ceeb rau kev txo qhov kev nqus hydrogen. Tsis tas li ntawd, kev xaiv cov flux thiab kev siv cov thev naus laus zis refining kuj tseem ceeb heev. Cov fluxes tam sim no muaj nyob hauv khw feem ntau yog chloride thiab fluoride. Cov fluxes no yooj yim nqus cov dej noo. Yog li ntawd, cov khoom siv raw yuav tsum khaws cia kom qhuav thaum lub sijhawm tsim khoom, kaw thiab ntim thiab khaws cia kom zoo. Kev txau hmoov tam sim no yog txoj hauv kev tseem ceeb rau kev ua kom 6063 txhuas alloy. Los ntawm txoj kev no, tus neeg sawv cev refining tuaj yeem sib cuag tag nrho nrog cov kua txhuas kom ua kom nws ua haujlwm tau zoo tshaj plaws. Lub siab nitrogen siv hauv kev ua kom hmoov yuav tsum qis li sai tau kom txo qhov kev pheej hmoo ntawm oxidation thiab hydrogen absorption.

Kev pov yog ib kauj ruam tseem ceeb hauv kev txiav txim siab qhov zoo ntawm cov pas nrig cam khwb cia. Qhov kub ntawm kev pov tsim nyog tuaj yeem zam qhov tshwm sim ntawm qhov tsis zoo ntawm kev pov. Rau 6063 txhuas alloy kua uas tau dhau los ntawm kev kho cov noob, qhov kub ntawm kev pov tuaj yeem nce mus txog 720-740 ° C. Qhov kub no yog qhov zoo rau kev ntws thiab khov ntawm cov kua txhuas thaum txo qhov kev pheej hmoo ntawm cov qhov hws thiab cov noob loj. Thaum lub sijhawm pov, yuav tsum tsis txhob muaj kev co thiab dov ntawm cov kua txhuas kom tiv thaiv kev tawg ntawm cov zaj duab xis oxide thiab kev tsim cov slag. Tsis tas li ntawd, kev lim cov kua txhuas yog ib txoj hauv kev zoo los tshem tawm cov slag uas tsis yog hlau. Yuav tsum tau ua kom ntseeg tau tias cov scum ntawm cov kua txhuas raug tshem tawm ua ntej lim kom ntseeg tau tias kev lim du.

Kev kho homogenization yog ib qho txheej txheem kho cua sov tseem ceeb kom tshem tawm kev ntxhov siab casting thiab kev tsis sib npaug ntawm cov tshuaj lom neeg hauv cov noob. Kev siv lead ua tsis sib npaug yuav ua rau muaj kev ntxhov siab casting thiab kev tsis sib npaug ntawm cov tshuaj lom neeg ntawm cov noob. Cov teeb meem no yuav cuam tshuam rau kev ua tiav ntawm cov txheej txheem extrusion, nrog rau cov khoom siv kho tshuab thiab cov khoom kho qhov chaw ntawm cov khoom kawg. Kev kho homogenization txhawb kev sib kis ntawm cov khoom siv aluminium alloy los ntawm cov ciam teb noob mus rau hauv cov noob los ntawm kev tswj cua sov ntawm qhov kub siab, yog li ua tiav kev sib xws ntawm cov tshuaj lom neeg hauv cov noob. Qhov loj me ntawm cov noob muaj kev cuam tshuam loj rau lub sijhawm kho homogenization. Cov noob zoo dua, lub sijhawm homogenization luv dua. Txhawm rau kom txo tus nqi ntawm kev kho homogenization, kev ntsuas xws li kev ua kom zoo ntawm cov noob thiab kev ua kom zoo dua ntawm kev tswj hwm kev faib tawm ntawm lub cub tawg tuaj yeem ua tau.

Kev tsim cov hlau txhuas 6063 yog ib qho txheej txheem nyuaj uas muaj kev tswj hwm kev sib xyaw ua ke, kev siv tshuab smelting thiab casting zoo heev, thiab kev ua kom homogenization tseem ceeb. Los ntawm kev xav txog thiab tswj cov yam tseem ceeb no, cov pas nrig txhuas zoo tuaj yeem tsim tau, muab cov khoom siv ruaj khov rau kev tsim cov profile tom ntej. Nrog kev nce qib ntawm kev tshawb fawb thiab thev naus laus zis thiab kev ua kom zoo dua ntawm cov txheej txheem, kev tsim cov hlau txhuas yuav ua haujlwm tau zoo dua thiab zoo rau ib puag ncig, ua rau muaj kev pab ntau dua rau kev txhim kho kev lag luam niaj hnub.