Aluminium alloy tuag castings feem ntau ntsib qhov tsis xws luag hauv kev tsim khoom. Crack defects yeej yooj yim to taub. Lawv txhais tau hais tias muaj cov kab nrib pleb tsis tu ncua los yog tsis tu ncua ntawm qhov chaw lossis sab hauv ntawm castings. Cov kab nrib pleb no tsis tsuas yog cuam tshuam qhov zoo ntawm aluminium alloy tuag castings, Nws kuj cuam tshuam rau lub neej kev pab cuam ntawm aluminium alloy tuag castings.
Yog vim li cas rau cracking ntawm aluminium alloy tuag castings:
Aluminium alloy tuag castings yuav muaj teeb meem tawg thaum lub sij hawm tsim thiab siv, thiab cov kab nrib pleb no yuav tshwm sim los ntawm ntau yam. Cov hauv qab no yog qee qhov laj thawj tseem ceeb uas yuav ua rau tawg ntawm aluminium alloy tuag castings:
- Temperature Gradient: Thaum lub sij hawm tuag casting, yog tias cov aluminium alloy ntsib qhov kub tsis sib xws thaum lub sij hawm txias, nws yuav ua rau kub tawg. Qhov no tej zaum yuav yog vim qhov chaw uas muaj cov thickness ntau dua los yog cov txheej txheem nyuaj txias sai dua li lwm tus, ua rau muaj kev ntxhov siab thiab thaum kawg tawg.
- Kev xaiv cov hlau tsis raug: Xaiv cov txhuas alloy uas tsis haum rau ib daim ntawv thov kuj tuaj yeem ua rau tawg. Cov aluminium alloys sib txawv muaj cov yam ntxwv sib txawv ntawm thermal expansion thiab contraction thiab mechanical zog, uas yuav ua rau muaj kev ntxhov siab concentration thiab tsim cov kab nrib pleb yog tias xaiv tsis raug.
- Cov teeb meem tsim: Cov qauv tsim ntawm kev tuag casting kuj tuaj yeem cuam tshuam rau nws qhov kev tiv thaiv tawg. Ntse sab hauv cov ces kaum los yog cov qauv inhomogeneities tuaj yeem ua rau muaj kev ntxhov siab ntau ntxiv, ua rau muaj kev pheej hmoo ntawm kev tawg.
- Kev ua haujlwm tsis raug: Kev ua haujlwm tsis raug, xws li kev ua kom txias ntau dhau, qhov tsis tsim nyog tuag-casting lossis cov txheej txheem ua tsis tsim nyog, tuaj yeem ua rau tawg.
- Material Impurities: Impurities los yog impurities nyob rau hauv aluminium alloys kuj yuav ua rau tawg. Cov impurities no tuaj yeem txo cov alloy lub zog thiab toughness, ua rau muaj kev pheej hmoo ntawm kev tawg.
- Kev ntxhov siab ntau ntxiv: Thaum lub sij hawm siv, aluminium alloy tuag castings yuav raug rau ntau hom kev quab yuam thiab kev ntxhov siab, uas tuaj yeem ua rau cov kab nrib pleb yog tias cov kev ntxhov siab ntau tshaj lawv cov qauv tsim.
Kev faib tawm ntawm Crack Defects hauv Aluminium Alloy Tuag Castings
Kev tawg tsis xws luag hauv aluminium alloy tuag castings tuaj yeem raug faib ua ntau hom. Raws li kev sib txawv ntawm cov kab nrib pleb, lawv tuaj yeem muab faib ua "shrinkage cracks", "kub tawg", "txias tawg", "nkig tawg", thiab lwm yam. Feem ntau ntawm lawv muaj feem xyuam rau kev tsim khoom. Cov hauv qab no yog ib qho yooj yim tsom xam ntawm qhov tawg tsis xws luag ntawm aluminium alloy tuag castings:
Shrinkage tawg
Shrinkage cracking yog feem ntau tawg tsis xws luag nyob rau hauv aluminium alloy tuag castings. Thaum lub casting txias thiab solidifies, qhov kev ntxhov siab sab hauv tsim los ntawm qhov ntim shrinkage, thiab yog tias lub solidification yog uneven los yog constrained, nws yuav ua rau tawg nyob rau hauv lub casting. Tshwj xeeb tshaj yog nyob rau hauv qhov chaw uas cov phab ntsa nyias thiab cov phab ntsa tuab hloov, vim qhov sib txawv solidification speeds, cov phab ntsa tuab tseem nyob rau hauv ib nrab ntawm cov khoom tom qab lub nyias phab ntsa yog solidified, thiab cov kua yuav tsis tau replenished, yog li shrinkage tawg. .
Kub tawg
Kub tawg yog tshwm sim los ntawm thermal stress ntawm aluminium alloy tuag castings thaum lub sij hawm solidification txheej txheem. Thermal stress yog vim qhov tsis sib xws ntawm thermal expansion thiab contraction tshwm sim los ntawm qhov kub thiab txias ntawm qhov sib txawv. Kub tawg tuaj yeem tsim nyob rau hauv castings yog tias qhov kub hloov pauv ua rau muaj kev ntxhov siab ntau tshaj qhov tsis ua hauj lwm lub zog ntawm cov khoom.
Txias tawg
Cov kab mob khaub thuas yog tsim nyob rau hauv lub siab solidified aluminium alloy tuag castings. Thaum lub casting yog txias, vim tsis sib xws nyob rau hauv kev nyuaj siab tis los yog cov khoom siv tsis zoo, cov kab nrib pleb khov yuav tshwm sim hauv aluminium alloy tuag casting.
Nplej tawg
Kev qaug zog tawg yog tshwm sim los ntawm lub voj voog thauj khoom ntawm aluminium alloy tuag castings thaum ua haujlwm. Thaum casting raug rov ua dua, qhov kev ntxhov siab maj mam tsim thiab tshaj qhov tsis ua haujlwm ntawm cov khoom siv, yog li ua rau qaug zog tawg hauv qhov casting.
Yuav daws qhov teeb meem Crack hauv Aluminium Alloy Tuag Castings li cas
Yuav kom daws tau qhov tawg tsis xws luag ntawmaluminium alloy tuag castings, cov kev ntsuas hauv qab no tuaj yeem raug coj los zam lawv. Nws yog ib qho tsim nyog los tshuaj xyuas thiab daws cov teeb meem tshwj xeeb ua ke nrog cov xwm txheej tiag tiag hauv kev tsim khoom.
- Tswj cov txheej txheem casting tsis, thiab tsim nyog tswj qhov kub ntawm casting, siab ceev, thiab lwm yam tsis ua hauj lwm los xyuas kom meej lub fluidity ntawm alloy thiab lub uniformity ntawm cov txheej txheem solidification thaum sau cov kab noj hniav.
- Tsim cov duab geometric tsim nyog, zam qhov kev hloov ntawm cov phab ntsa nyias thiab cov phab ntsa tuab, txo qhov siab gradient, thiab sim ua kom cov qauv ntawm cov casting txawm.
- Optimize pwm tsim, rationally tsim lub rooj vag system thiab cua txias system, txhim kho lub solidification ceev thiab uniformity ntawm castings, thiab txo qhov tshwm sim ntawm cov kab nrib pleb.
- Tswj cov txheej txheem kho cua sov. Rau qee qhov aluminium alloy tuag castings uas xav tau kev kho cua sov, cov txheej txheem kev kho cua sov yuav tsum tau tswj kom zoo kom tsis txhob muaj kev ntxhov siab thermal thiab txo thermal tawg.
- Ua kom muaj kev tswj xyuas zoo, los ntawm kev tswj xyuas nruj, xws li kev tshuaj xyuas cov khoom, kev tswj cov txheej txheem casting thiab cov txheej txheem kev kho cua sov, thiab lwm yam, los xyuas kom meej tias qhov zoo ntawm castings ua tau raws li qhov yuav tsum tau ua thiab txo qhov tsis xws luag.
- Los ntawm cov txheej txheem tsim nyog thiab kev tswj kom zoo, tawg qhov tsis xws luag ntawm aluminium alloy tuag castings tuaj yeem txo qis, thiab cov khoom lag luam thiab kev ntseeg tau tuaj yeem txhim kho.