| 摘要 |
<p>PURPOSE:To manufacture a sand mold having a good surface of a casting mold by fitting a blow nozzle into the introducing hole of metallic molds provided with vent holes and blowing a molding material through the nozzle then inserting a gushing nozzle provided with the slit having the same length as the length of the introducing hole and curing the material by gas. CONSTITUTION:A blow nozzle 5 is inserted into the introducing hole 4 of metallic molds 1, 2 with bent holes 3 and a molding material is blown through said nozzle to pack the inside of the molds. The nozzle 5 is removed and a gushing nozzle 9 having the same length H as the thickness L of the hole 4 is inserted therein. Curing gas is blown through said nozzle. A slit-shaped hole is opened to the tip of the nozzle 9 and the projecting part 8 of the hole part is flattened simultaneously with gas blowing, by which the surface of the molded sand mold is smoothed. The need for post conditioning is thus eliminated and the man-hour is reduced.</p> |
