| 摘要 |
PURPOSE:To simplify a casting stage in a lost wax method in the stage of casting precisely mechanical parts, etc. having intricate shapes by the lost wax method by incorporating metallic powder for casting in a wax model. CONSTITUTION:After 80vol% powder of a heat-resistant alloy, etc. to be used for casting, 10vol% paraffin wax, and 2vol% molding assistant are kneaded at 100 deg.C, the mixture is cooled to solidify and is pulverized to granules of average 2mm. square. The granules are molded to a model 5 of machine parts having an intricate shape with an injection molding machine. Wax 6 of the same quality as the quality of the above-mentioned wax for compensating the portion for the riser and the loss of the wax is placed on the model 5 and a refractory slurry such as zircon sand is coated on the outside thereof and is dried. Such coating and drying are repeated to mold a casting mold 7 formed of the refractory material. The mold is put in a heating furnace and the wax is melted away to leave the metallic powder in the mold 7, then the temp. is raised in this state to melt the metallic powder and to fill the molten metal by gravity in the mold 7. After the molten metal is cooled to solidify, the mold 7 is broken and a casting 9 is taken out. |
