METHOD AND DEVICE FOR FORMING PILFER-PROOF CAP

摘要

PROBLEM TO BE SOLVED: To provide a forming method and a forming device for a pilfer-proof cap which ensure the rigidity and the forming accuracy of a predetermined part to be formed with a screw and a skirt part, thereby achieving stable forming. SOLUTION: The predetermined part 11k to be formed with the screw and the skirt part 11m are formed by rolling a peripheral wall part 11a equivalent to the predetermined part 11k to be formed with the screw and the peripheral wall part 11a equivalent to the skirt part 11m at approximately the same circumferential speed by pressing them all around the periphery with an outer tool 3 and an inner tool 5 by pressing a first outer periphery holding surface 3d and a first inner periphery holding surface 5e against each other through the peripheral wall part 11a and also pressing a second outer periphery holding surface 3k and a second inner periphery holding surface 5m against each other through the peripheral wall part 11a. COPYRIGHT: (C)2006,JPO&NCIPI