| 摘要 |
PROBLEM TO BE SOLVED: To make a change piece efficiently by a method in which a recession is formed by cutting the inner surface of a mold in the normal line direction, an information displaying change piece is attached replaceably to the recession and molded from aluminum or its alloy by a change piece die-casting method, and then on its surface, an information transfer part is processed mechanically. SOLUTION: A recession 5 which was counterbore-processed in the normal line direction R is formed on the inner surface of a side mold 1. In the recession 5, a cutting depth in the normal line direction is made nearly uniform. An extraction hole 6 communicating with the side mold 1 from the back is formed in the bottom surface of the recession 5, and the bolt fixing and pushing removal of a change piece 4 is done. The change piece 4 without an information transfer part is formed commonly to a mold of different tire sizes and specifications. By the mechanical processing of the desired information transfer part on the surface of the change piece 4 based on tire sizes and specifications, the change pieces 4 can be made efficiently for molds of different tire sizes and specifications. |
