To provide a mold for an annular member hard to cause burrs in an outer region in a diametric direction when the annular member like a bead member is injection-molded.
The mold for the annular member is equipped with a lower mold 7 wherein an annular recessed part 9 for molding the bead member is formed and an upper mold 8 constituted relatively movable with respect to the lower mold 7 between a mold clamping position where the annular recessed part 9 is closed to form a cavity 11 and a mold opening position where the annular recessed part 9 is opened and an annular stepped part D is formed on the mold matching surfaces 7a, 8a, 7b and 8b of the lower and upper molds 7 and 8 in the outer region in the diametric direction of the annular recessed part 9. The mold matching surfaces 7a and 8a of the lower and upper molds 7 and 8 are brought into contact with each other in the inner region in the diametric direction of the annular stepped part D and the mold matching surfaces 7b and 8b of the upper and lower molds 7 and 8 are constituted so as to form a slight gap in the outer region in the diametric direction.
Yuzo Ozaki
Toshihiko Taniguchi