| 摘要 |
PURPOSE:To reduce cost by a method wherein a third extrusion mold shorter than a mold connection portion and provided with a surface treatment device is set in a method mold so that it is located on an extension of a surface treatment device of a first and a second extrusion molds with a separating slit made along the treatment device of the third mold to the mid point. CONSTITUTION:On mold connecting portions 5B, 5C between fist extrusion molds 1B, 1C and second extrusion molds 3B, 3C, a third extrusion mold C which is shorter than the connection ports 5B, 5C and provided with a surface treatment device is inserted into a metal mold. The third extrusion mold is set in the metal mold so that it is located on an extension of the respective treatment devices of the first and second extrusion molds 1B, 3B and 1C, 3C with the treatment device of the third extrusion mold formed with a separating slit along the treatment device from both ends to the mid point. Then, mold material is poured into a metal mold cavity to have a die forming part molded. A corner mold 7 is made as it used to. Surface treatment is not needed on the die forming part, reducing cost. |
