| 摘要 |
PURPOSE:To improve resistance to creep and prevent falling of a cap at the time of forming a hat-shaped wheel cap made of synthetic resin by setting an elastic ring-shaped frame member in a space for forming a cap opening end of a metallic mold core before making injection molding. CONSTITUTION:In a space 23 to form therein an opening end of a wheel cap 1 at a joining part of cores 21, 22 of a for injection forming mold, an almost rectangular bench 26 is provided in a flang bottom forming part 25 of the wheel cap 1, and the elastic ring-shaped frame member 10 is set there so as to be prevented from its lateral slide by means of a pair of pins 27. Subsequently, injection molding is performed. Thus, the frame member 10 is buried and formed as one body in the flange of the wheel cap 1, and a part opposite to the bench 26 is formed like a window so as to allow visual recognition of the frame member 10. Due to such a configuration, the ring-shaped frame member 10 prevents inward deformation of a side wall of the wheel cap to improve resistance against creep, and falling of the wheel cap may be prevented. |
