Lub cub hluav taws xob hauv qab los yog cov khoom ua ntej ua los ntawm cov nrau hliv rau ntawm qhov chaw muaj qhov loj tag nrho tom qab kev nthuav dav. Yog tsis muaj cov pob qij txha kom tsim nyog, cov cub hluav taws xob tuaj yeem bent lossis puas. Yog li peb yuav tsum tau tshwj tseg cov pob qij txha nthuav.
Cov foos ntawm kev nthuav dav pob qij txha hauv pouring cov ntaub ntawv tau muab faib ua ob hom: los ntawm cov pob qij txha thiab tsis yog sib koom ua ke. Kev tshwj tseg ntawm expansion pob qij txha rau pouring cov ntaub ntawv tsuas yog cuam tshuam nrog kev xaiv cov spacing, dav, thiab daim ntawv ntawm kev nthuav dav. Dab tsi yog qhov loj me ntawm kev nthuav dav rau cov khoom sib txawv ntawm cov khoom siv
Siab Aluminium casting cov khoom yog 6-8 hli;
Cov dej iav casting cov khoom yog 4-6 hli;
Phosphate raws li castsable yog 6-8 hli;
Silicate Maas casting cov khoom yog 5-8 hli
Kev nthuav tawm sib koom ua ke thiab nws cov tuab yuav tsum tau tshwj tseg raws cov qauv tsim. Thaum tus qauv tsim tsis qhia, asbestos board lossis plywood yuav tsum tau siv rau sau, nrog ib tuab ntawm {{mm.
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