| 摘要 |
PURPOSE:To improve the productivity of a molded product by forming an annular cut groove on the periphery of a cavity for molding a product with upper and lower molds and forming an annular cylinderical unit in which the cavity for molding a product is elevationally moved is formed, thereby enhancing the accuracy of removing the rubber burr of the product. CONSTITUTION:Unvulcanized rubber is filled in cavities 3, 3'. Excessive rubber is filled as rubber burr in cut grooves 4 and 5. A mold 1 is raised at a distance corresponding to an interval A. Cylindrical units 6, 6' are pressed by a push plate 7 and a bearing plate 8. The rubber is heated and vulcanized. After the vulcanization, the plate 8 is removed, and a bearing plate 8' designated by two- dotted chain line is contacted with the lower surface of the lower mold. A punching plate 10 designated by two-dotted line is placed on the plate 7, and only the unit 6 is pushed by a push pin 11. When the unit 6 is pressed downwardly by the pin 11, the unit 6' is also moved downwardly. Accordingly, the lower end of the unit 6 is passed through the ends of the grooves 4, 5, and the products in the cavities 3, 3' are cut off the burrs of the grooves 4, 5. |
