Yog vim li cas rau blistering nyob rau hauv zinc alloy tuag-casting:
1. Ua los ntawm qhov: feem ntau yog pores thiab shrinkage mechanism. Cov pores feem ntau yog puag ncig, tab sis feem ntau constrictions tsis xwm yeem. (1) Ua rau ntawm qhov pores: Thaum lub sij hawm nce nqi thiab cov txheej txheem solidification, vim muaj cov pa nkag, cov kua hlau ua rau lub qhov hws ntawm qhov chaw los yog hauv qhov casting. BThe gas evaporated los ntawm cov xim invades. c Cov ntsiab lus roj ntawm cov kua alloy yog siab dhau, ua rau coagulation thiab nag lossis daus. Thaum cov pwm tsis zoo, cov pa hauv cov kab noj hniav thiab cov pa roj tsis zoo los ntawm cov xim yuav nyob twj ywm hauv qhov casting los tsim qhov pores. (2) Yog vim li cas rau shrinkage: Thaum lub sij hawm solidification txheej txheem ntawm cov kua hlau, vim lub ntim txo los yog qhov kawg solidified ib feem tsis yog ib tug kua hlau cov ntaub ntawv thiab shrinks qhov. B Lub thickness tsis sib npaug ntawm cov casting los yog casting yog nyob rau hauv lub zos overheated, ua rau lub nto kom solidify maj mam thaum lub ntim shrinkage, tsim ib tug concave nto. Vim muaj cov pores thiab shrinkage qhov, dej tuaj yeem nkag mus rau saum npoo ntawm qhov tuag casting. Thaum pleev xim thiab electroplating, cov pa roj hauv lub qhov thermally nthuav dav, lossis cov dej hauv lub qhov hloov mus rau hauv chav thiab nthuav dav hauv ntim, ua rau muaj npuas nyob rau saum npoo ntawm qhov casting.
2. Intergranular corrosion ntawm teeb meem impurities nyob rau hauv zinc alloys: txhuas, cadmium, thiab tin yuav sib sau ua ke nyob rau hauv lub crystal ciam teb, ua rau intergranular corrosion, intergranular corrosion, thiab breakage ntawm cov hlau substrate thiab txheej, accelerating kev puas tsuaj, thiab intergranular corrosion nyob rau hauv cheeb tsam no. yuav nthuav. sab saum toj, ua npuas nyob rau saum npoo ntawm casting. Tshwj xeeb tshaj yog nyob rau hauv ib puag ncig ntub, intergranular corrosion tuaj yeem ua rau castings deform, tawg, los yog tawg.
3. Ua rau cov kab nrib pleb: dej, cov kab sib cais txias, thermal tawg. 1) Cov kab hluav taws xob thiab dej txias: Thaum lub sij hawm them cov txheej txheem ntawm cov kua hlau, cov kua hlau nkag mus rau ntawm phab ntsa tiv thaiv thiab ua kom muaj zog ua ntej, thiab tom qab ntawd cov kua hlau thiab cov hlau ua kom muaj zog tuaj yeem sib xyaw ua ke, thiab cov kab nrib pleb tshwm sim nyob rau hauv daim ntawv ntawm pob qij txha. qhov saum npoo ntawm casting. Cov dej feem ntau yog ntiav nyob rau saum npoo ntawm qhov casting thiab qhov chaw txias yuav nkag mus rau hauv qhov casting. 2) Thermal tawg: Thaum cov phab ntsa thickness ntawm lub casting yog tsis sib xws, kev nyuaj siab ua ib tug solidification txheej txheem; B. ejection ntxov ntxov, tsis muaj zog hlau tsis txaus; C. pwm kub, tsis sib npaug ejection quab yuam, thiab coarse nplej; E. muaj teeb meem impurities. Cov kev txwv no tuaj yeem raug nyiag. Thaum cov tuag casting muaj cov cim dej, cov kab nrib pleb txias, kub tawg thiab plating tov, cov kab nrib pleb yuav nkag mus thiab hloov mus rau hauv chav ci, thiab cov hlau yuav muab tso rau saum lub siab los ua cov hlwv.
Txoj kev los daws cov zinc alloy tuag-casting tsis xws luag:
1. Kev tswj ntawm qhov pore tiam: Qhov tseem ceeb yog txo cov nqi ntawm cov khoom sib tov. Qhov zoo tshaj plaws hlau ntws yuav tsum tsis tu ncua ceev lub nozzle rau hauv pwm kab noj hniav los ntawm lub diverter cone thiab pouring channel los tsim ib tug du hlau ntws kev taw qhia. Lub hom phiaj no yog ua tiav los ntawm kev siv lub voj voos kheej kheej tsim, uas yog, cov dej ntws yuav tsum tsis tu ncua nrawm thiab maj mam txo los ntawm lub nozzle mus rau lub qhov dej qhib. Nyob rau hauv ib qho kev kaw lus, cov roj sib xyaw ua rau cov pores vim yog kev sib xyaw ntawm cov dej ntws thiab cov hlau ua kua. Cov kua hlau nkag mus rau hauv pwm kab noj hniav thaum lub sij hawm simulated tuag-casting txheej txheem ua rau kom muaj kev hloov pauv hauv qhov chaw nres nkoj ntawm cov dej ntws, ua rau muaj kev kub ntxhov thiab cov pa nkag hauv cov kua hlau ntws. Cov hlau ua kua yog du, uas yog qhov tsim nyog rau cov roj nkag mus rau hauv qhov dej ntws los ntawm qhov chaw nres nkoj thiab cov kab noj hniav. thiab cov qhov tso tawm.
2. Shrinkage: Ua kom tag nrho cov seem ntawm zinc alloy tuag-cam khwb cia kom deb li deb tau thaum dissipating tshav kub thiab solidifying tusyees. Tsis txhob shrinkage los ntawm kev tsim nozzle tsim, pwm tsim, rooj vag tuab thiab qhov chaw, pwm tswj qhov kub thiab txias. Intergranular corrosion: Tswj cov ntsiab lus impurity tseem ceeb ntawm cov khoom siv phom sij, tshwj xeeb tshaj yog cov hlau lead 0.003%. Saib xyuas cov khib nyiab thiab impurities.
3. Dej thiab dej txias barrier: Nws tuaj yeem ua rau pwm kub tuaj, ua kom lub qhov rooj nrawm nrawm, lossis ntxiv qhov dej ntws tawm hauv qhov chaw txias txias kom txo tau qhov txias txias ntawm cov nplej kaw.
4. Kub tawg: Lub thickness ntawm zinc alloy tuag castings tsis hloov sai, txo cov tiam ntawm kev ntxhov siab; tuag casting txheej txheem tsis thiab kho; txo pwm kub
