Study on Surface Roughness of Ceramic Shell Prepared by Layered Extrusion Forming Technology
The ceramic shell in investment casting is typically prepared through a series of steps including wax mold pressing,wax mold tree assembly,wax mold stain slurry,mold shell dewaxing,and mold shell roasting.By utilizing layered extrusion forming technology,the ceramic shell can be directly formed,simplifying the process flow of investment casting significantly.This study focused on alumina ceramic paste and investigates the impact of key process parameters(nozzle diameter,extrusion layer height,and forming angle)on the surface roughness of the ceramic shell.A mathematical model for predicting surface roughness was established,and further reduction in surface roughness was achieved through post-treatment coating.Experimental results demonstrated that when using a nozzle diameter of 0.26 mm,an extrusion layer height of 0.2 mm,and a forming angle of 90°,the sample's surface roughness Ra reached its lowest value at(12.9±0.9)μm;after applying the coating treatment,this value was reduced to less than 6.3 μm.
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