| 摘要 |
PURPOSE:To improve the accuracy of a die and to reduce the cost thereof by fixing a mold for a joint surface having a pouring port to a casting mold, supplying a molten metal through the pouring port into a cavity and forming a die body having the joint surface. CONSTITUTION:A pattern is preliminarily imposed on a molding board and a molding flask is disposed around the pattern. Molding sand is packed into the flask to form the casting mold 44. The mold 44 is then rolled over and the mold 46 for the joint surface having the pouring port 48 is disposed atop the same and is pressed and fixed by a weight 52. The molten metal is there after poured through the pouring port 48 into the cavity 50 so that the molten metal spreads to the top end of the pouring port 48. Gas is thereby discharged from the mold 46 and the pouring port 48 to the outside; at the same time, the flat joint surface 56 is formed on the bottom surface of the mold 46. The need for grinding the same is eliminated. The accuracy of the die such as punch 62 having the die body 54 is thus improved and the cost is reduced.
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