| 摘要 |
The end faces of the edge portions of a flat plate, which have been respectively cut into a given shape according to a trimming operation, are then respectively face-struck into a linear shape. Also, in the trimming operation, each of the edge portions of the flat plate is cut into a shape having a larger dimension than that of a finally required shape thereof, and the thus produced excess length portions of the edge portions are worked by compressing when a pair of semidivided cylindrical portions are butted against each other. Since a connecting portion situated between the pair of semidivided cylindrical portions is always pressed with a given pressure, the working properties of the connecting portion in the molding operation are prevented from being revived. Further, in the neighborhood of one side edge portion and the other side edge portion, there are formed pressing recessed portions or pressing projecting portions which, when connecting together one side edge portion and the other side edge portion, are used to press against one side edge portion and the other side edge portion in their mutually opposing directions.
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