1 Kev Taw Qhia

Aluminium tuag casting tseem yog txoj hauv kev tseem ceeb rau kev tsim cov qib siab - ntim, ze rau -net- cov khoom siv rau tsheb, hluav taws xob, thiab cov neeg siv khoom siv. Cov kev sib tw tsis tu ncua suav nrog kev tswj cov porosity, qhov ruaj khov ntawm qhov ntev, thiab microstructure- tsav tsheb hloov pauv hloov pauv. Txoj kev tshawb fawb tam sim no sau cov txheej txheem kev sim rov ua dua tshiab uas txuas cov txheej txheem tswj hwm kev hloov pauv kom muaj nuj nqis hauv cov porosity thiab kev coj tus cwj pwm, ua kom muaj kev thov ncaj qha rau hauv qhov chaw tsim khoom.

2 Txoj kev tshawb fawb

2.1 Kev sim tsim

Ib qho kev sim tsim kev sim ntsuas plaub yam tseem ceeb: yaj kub (T_melt), kub kub (T_die), tua ceev (V_shot), thiab tuav siab (P_hold). Txhua yam muaj peb theem (qis, nruab nrab, siab) xaiv los ntawm ntau yam raug rau kev ua lag luam. Tag nrho ntawm 27 khiav (3^3 tsim rau feem cuam tshuam) tau ua tiav; rau kev sib piv tseem ceeb, tus qauv loj ntawm ib tus mob yog n=10 tso cai rau kev kho mob hauv cov lej (txhais tau tias ± tus qauv sib txawv).

2.1.1 Khoom thiab yaj npaj

Alloy: A380-series tuag casting alloy; muaj pes tsawg leeg thiab cov kab tshav kub tau sau tseg hauv Cov Ntawv Ntxiv A.

Melt tuav: Gas fluxing ua ntej pouring; yaj nyob rau hauv cov huab cua tswj kom txwv hydrogen pickup.

Superheat ntau ntau: Lub hom phiaj ntawm 680-730℃(melt pouring kub hloov hauv kev sim); thermal profile nkag txhua 5 s siv hom K thermocouple.

2.1.2 Tooling thiab tshuab

Tuag: Ob-kab kab noj hniav steel tuag nrog conformal cua txias raws; inserts ntsuas nrog K-hom thermocouples.

Tshuab: 1000 kN txias-chamber tuag casting tshuab nruab nrog programmable txhaj profile thiab kaw-voj txhaj- tswj ceev.

Kev ntsuas ntsuas: Cov ntaub ntawv ceev ceev (1 kHz) rau kev txhaj tshuaj profile; yaj thiab tuag kub sau tseg rau ± 1 degree.

2.1.3 Tom qab-txheej txheem tuav thiab sampling

Qauv: Txheem tensile tuav rho tawm los ntawm kev pom los ntawm castings tom qab 24 teev ntuj txias; machining rau ASTM-compatible gauge geometry rau tensile xeem.

Cov ntawv cim npe: Txhua tus qauv encoded nrog khiav ID, kab noj hniav, thiab tus lej qauv rau kev taug qab.

2.1.4 Cov txheej txheem xeem (kev ua kom pom tseeb)

Kev ntsuas tensile: Raws li tus qauv tensile xeem cov txheej txheem siv Instron- hom tshuab; crosshead ceev teem kom ua tiav qhov kev sib tw ntawm 1 × 10^-3 s^-1.

Hardness: HV ntsuas ntawm polished cross-sections siv 10 kgf load; tsib indents ib qho piv txwv nruab nrab.

Porosity: Ob txoj kev siv - (a) Archimedes immersion mass method rau bulk porosity fraction, thiab (b) optical image analysis on polished sections to get area fraction and pore size distribution. Cov ntawv suav suav muaj nyob rau hauv Cov Ntawv Ntxiv B rau kev rov tsim dua tshiab.

Metallography: Cov qauv mounted, hauv av, polished, thiab etched nrog tus qauv Keller's reagent rau microstructure ntsuam xyuas nyob rau hauv optical microscopy (200 × – 1000 ×) thiab scanning electron microscopy qhov twg qhia.

3 Cov txiaj ntsig thiab kev txheeb xyuas

3.1 Cov ntsiab lus ntawm cov txiaj ntsig tseem ceeb

Table 1 qhia txog cov neeg sawv cev ntawm cov khoom siv thiab cov porosity metrics rau hauv paus, nruab nrab, thiab optimized parameter sets. Tag nrho cov txiaj ntsig sawv cev txhais tau tias ± tus qauv sib txawv (n=10 ib yam).

Table 1. Cov neeg sawv cev siv tshuab thiab porosity metrics

3.2 Kev soj ntsuam microstructural

Daim duab 1 (hauv qab) qhia pom cov duab micrographs piv cov hauv paus ntsiab lus thiab cov xwm txheej zoo. Cov qauv hauv paus nthuav dav dav interdendritic porosity thiab coarser eutectic tes hauj lwm; optimized kuaj pom txo porosity thiab finer interdendritic spacing.

Daim duab 1.Optical micrographs (200 ×) ntawm polished thiab etched cross-sections: (a) Baseline mob uas qhia interdendritic pores; (b) Optimized mob nrog txo qhov pore ntom.[Ntxig siab- cov duab daws teeb meem hauv cov ntawv sau kawg; cov ntaub ntawv raw cov ntaub ntawv khaws tseg hauv Cov Ntawv Ntxiv A.]

3.3 Kev txheeb xyuas thiab kev sib piv nrog cov ntaub ntawv uas twb muaj lawm

Kev soj ntsuam ntawm qhov sib txawv (ANOVA) ntawm cov ntaub ntawv factorial tau txheeb xyuas qhov kub thiab txias ntawm qhov kev txhaj tshuaj yog qhov tseem ceeb rau qhov sib txawv ntawm qhov porosity (p <0.01), nrog rau qhov kub thiab txias thiab tuav lub siab ua kom pom qhov tseem ceeb tab sis me me (p <0.05). Kev pom zoo txo ​​qhov porosity thiab sib txuas ntxiv hauv tensile kev ua tau zoo sib xws nrog cov kev tshawb fawb ua ntej; qhov kev pab cuam tam sim no suav cov txiaj ntsig sib xyaw ua ke raws li cov txheej txheem kev ntsuas qhia meej (Section 2.1.4).

4 Kev sib tham

4.1 Kev txhais lus ntawm kev sib raug zoo

Txo cov yaj superheat txo cov roj solubility thiab txo qhov loj ntawm cov hlwb shrinkage, pab txo cov porosity feem. Qhov kub siab tshaj qhov tuag taus txhawb kev taw qhia kom muaj zog thiab txo cov thermal gradients uas txwv tsis pub cov pa roj. Kev txhaj tshuaj profile uas txo qis kev kub ntxhov thaum lub sij hawm pwm filling txwv oxide nkag thiab cua nkag; tuav lub siab mitigates shrinkage yog tias siv ua ntej cov ntaub ntawv tseem ceeb ntawm cov khoom seem. Cov txiaj ntsig sib xyaw ua ke yog li kev ua haujlwm zoo ib yam nrog kev pom kev txhim kho microstructural thiab mechanical gains.

4.2 Kev txwv

Alloy tshwj xeeb: Cov txiaj ntsig tau tshaj tawm rau A380-series alloy; alloy-dependent teebmeem (xws li, rau Al-Si-Mg variants) yuav txawv.

Tooling geometry thiab tshuab nplai: Ob-kab noj hniav tuag thiab 1000 kN tshuab tau siv; scaling rau cov tuag loj dua lossis cov chav kawm sib txawv ntawm lub tshuab yuav xav tau kev hloov kho dua tshiab.

Kev ntsuas qhov ntsuas: Thaum Archimedes thiab cov duab tsom xam muab cov kev ntsuas porosity ntxiv, peb-dimensional porosity faib los ntawm X-ray CT tej zaum yuav tsim nyog rau cov khoom uas muaj cov yam ntxwv sab hauv.

4.3 Cov kev cuam tshuam

Kev tsim cov kab tuaj yeem ua raws li cov kauj ruam ua tau raws li hauv qab no: txo cov melting superheat nyob rau hauv lub qhov rais qhov rooj, qhov ntsuas qhov ntsuas kub tseem ceeb rau kev kaw lub voj kaw qhov kub thiab txias, thiab cov txheej txheem txhaj tshuaj uas txwv cov kev hloov pauv siab. Cov txheej txheem tswj cov kab kos rau cov porosity feem (cov qauv ib hlis) raug pom zoo los tswj cov txheej txheem muaj peev xwm.

5 Kev xaus

Cov txheej txheem parameter tswj nyob rau hauv high-pressure aluminium tuag casting ncaj qha cuam tshuam porosity feem thiab kev ua haujlwm txhua yam. Cov txheej txheem kev sim uas tau sau tseg hauv no qhia tau hais tias kev sib koom ua ke ntawm kev hloov kho- qis dua melting superheat, moderated txhaj ceev, thiab siab tuag kub - ua kom txo tau qhov porosity thiab ntsuas kev txhim kho hauv tensile zog thiab elongation. Kev siv cov ntaub ntawv ntsuas thiab ntsuas kev ua haujlwm ua rau muaj kev soj ntsuam thiab kho kom zoo rau cov kab ntau lawm. Kev ua haujlwm yav tom ntej yuav tsum txuas mus rau txoj hauv kev rau ntau qhov kev tuag geometries, ntxiv alloys, thiab peb-dimensional porosity characterization.

Cim npe nrov: Tuam Tshoj txhuas tuag casting & cnc machining manufacturers, lwm tus neeg, Hoobkas