| 摘要 |
PURPOSE:To improve the utilizing efficiency of molding sand and working environment in a casting method in which a casting mold obtd. by packing the molding sand into the space formed of a vacuum sucking pattern and molding flask is used by executing vacuum suction along with the excitation in the above-mentioned packing stage. CONSTITUTION:A suction box 1 is raised together with the pattern 2 and a heated film 5 is placed on the surface of the pattern 2. The inside of the box 1 is vacuum-sucked to attract and shape the film 5 onto the pattern 2 surface. The molding flask 7 having a suction filter 7a and suction pipe 7b on the inside and outside is set to the pattern. The molding sand 10 is packed into the space 9 formed of the pattern 2 and the flask 7. The entire part of the box 1, the pattern 2 and the flask 7 is oscillated in this stage and the inside of the space 9 is vacuum-sucked via the box 1 or the flask 7. Sand spilling is thereby prevented. After the sand 10 surface is leveled off, a film 12 is placed on the sand 10 surface and the vacuum suction is executed via the box 1 and the flask 7 to harden the sand 10. The cope and drag of the casting mold obtd. in the above-mentioned manner are combined and a molten metal is poured into the casting mold in the reduced pressure state. A casting is thus obtd. |
