| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of a sink in the periphery of a part crushed by pinch-off parts by making the width dimensions of the pinch-off parts large and forming one pinch-off part into a stepwise state so that the interval with the other pinch-off part becomes successively wide from a molding space toward the outside of a mold. SOLUTION: A blow mold consists of a pair of molds M1, M2 and has pinch- off parts 1,2 on the side of a molding space C and open parts 3, 4 are provided to the outside of the mold of these pinch-off parts 1, 2. For example, chamfering parts 1d, 2d forming an angle of inclinationα1=45 deg. are provided on the side of the molding space C of the molding space C of the pinch-off space C and three step parts, that is, first, second and third step parts 1a, 1b, 1c are formed to the pinch-off part 1 of the mold M1. Further, the step dimension DI between the first step part la of the pinch-off part 1 and the open part 3 and the step dimension D2 of the pinch-off part 2 and the open part 4 are respectively, for example, 40mm and the min. interval A between both pinch-off parts 1, 2 is set, for example, to 1mm. |
