Tooj liab yog cov hlau tsis muaj hlau uas cuam tshuam nrog tib neeg. Tin tooj liab yog cov hlau tsis muaj hlau uas muaj qhov tsawg tshaj plaws casting shrinkage tus nqi. Nws yog siv los tsim cov castings nrog cov duab nyuaj, qhia meej thiab tsis xav tau huab cua nruj. Yog li dab tsi ntawm cov tooj liab tooj liab yog qhov tsim nyog tiag tiag rau kev tsim cov castings?
Thaum cov ntsiab lus tin tsawg dua 5 ~ 6%, tin yaj hauv tooj liab los ua cov tshuaj tov, thiab cov yas ntxiv. Thaum cov ntsiab lus tin ntau dua 5 ~ 6%, vim qhov pom ntawm Cu31sb8-raws li cov khoom sib xyaw, lub zog tensile txo qis, yog li cov nplai yog Cov ntsiab lus ntawm cov tin tin yog feem ntau ntawm 3-14%. Thaum cov ntsiab lus tin tsawg dua 5%, nws yog qhov tsim nyog rau kev ua kom txias txias, thiab thaum cov ntsiab lus tin yog 5 txog 7%, nws tsim nyog rau kev ua kom deformation kub. Thaum cov ntsiab lus tin ntau dua 10%, nws tsim nyog rau casting.
Vim tias cov tooj liab tooj liab muaj qhov kub thiab txias ntau yam tsis zoo, nws tsis yooj yim los tsim cov kab noj hniav me me, thiab nws yooj yim rau tsim dendritic cais thiab cais cov kab noj hniav. Kev nqes peev txheej me me yog qhov yooj yim kom tau txais cov castings nrog qhov loj me nyob ze rau pwm, yog li nws haum rau casting Cov duab nyuaj. Qhov xwm txheej ntawm phab ntsa tuab tuab tsis haum rau cov khoom siv casting uas xav tau kev ntom ntom ntom ntom thiab kev sib khi zoo.
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