PRESSING DIE FOR PRECISION CASTING AND PRODUCTION THEREOF

PURPOSE:To reduce working man-hour of machining stage and finishing stage in production of a die for press by precisely casting the faces, where works for upper die and lower die abut on, by using a model for precision casting and special sand having extremely fine particle. CONSTITUTION:The casting produced by the precision casting is arranged at the faces, where at least the works for the upper die 1 and the lower die 6 abut on. Cavity 14a in the upper die 1 is shaped by using the model for precision casting made of gypsum or resin as raw material and the other cavities 14b-14d are shaped by full mold casting means using a model made of foaming styrene, etc. At first, casting sand 15 is charged into the cavities 14a-14d and a model for full mold casting and the model for precision casting are set and the special sand 13 having extremely fine particle and the casting sand 12 are charged. Each model is taken out and molten metal is flowed from a sprue 16 to fill up each cavity 14a-14d. Next, after cooling and solidifying, the upper die 1 is completed. The lower die 6 is produced by the same way. By this die for press, the fine casting surface is obtd.