Investment Casting Shell Building
熔模铸造制壳挂砂步骤
标签：制壳, 挂砂, 浆料, 硬化, 失蜡
蜡模焊接浇道后浸入硅溶胶浆料，再蘸 40–120 目耐火砂，干燥硬化。重复 6–10 层，逐层加粗砂目并延长干燥，形成 6–10 mm 硬壳。最后蒸汽或焙烧脱蜡，壳型即可浇注。每层必须彻底干燥，否则壳裂或铸件夹砂。
After welding gates to the wax pattern, dip it in colloidal-silica slurry, then stucco with 40–120 mesh refractory sand and let it harden. Repeat 6–10 layers, coarsening the grit and lengthening drying each time to build a 6–10 mm shell. Dewax by steam or burnout, then the shell is ready to pour. Each layer must dry fully or the shell cracks and entraps sand. ---