| 摘要 |
PURPOSE:To obtain a core die with a specified cutting margin width by casting a metallic pattern by utilizing a full-molding method, and then grinding the mold in a desired shape into a product press die. CONSTITUTION:The surface of the model 1 of a press product is coated with a release agent 2 and after a flask 3 is built up, gypsum 4 is flowed into it and hardened gypsum 4 is taken out of the flask 3 as a master model 5, which is coated with a release agent 7 to obtain a framework 8, which is charged with a plastic resin foamed body 9. The foamed body 9 after hardened is taken out of the flask 8 and divided into blocks, between which platelike foamed bodies 11 are sandwiched to obtain a little bit greater overall width; and a foamed body 13 is fitted to the top surface to obtain a core die 6. This core die 6 is used as a core to form a casting mold 14, and molten metal is casted to obtain a metallic pattern, whose surface is ground into a press die. |
