| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for processing a frame which integrally molds a connection part from a sheet metal material and is for a structure that can be processed at low cost, and its metal mold.SOLUTION: As shown in Fig.5, the angle of an opening part 33 of a groove shape part 3 is expanded from 90 degrees (angle θ1) of Fig.5(a) to some 120 degrees (angle θ2) of Fig.5(b). As shown in Fig.5, an opening part of a lip groove shape part 2 adjacent to the groove shape part 3 is expanded to an angle close to some 120 degrees of Fig.5(b) from 90 degrees of Fig.5(a), following the expansion of the groove shape part 3. The groove shape part 3 undergoing bending with a stage and molding is composed of three sides being less than the rip groove shape part 2 by one side. Further, since the angle of the opening part 33 of the groove shape part 3 is expanded from 90 degrees to some 120 degrees before bending with a stage and molding, an operation of the metal mold only requires a simple vertical operation, and since a metal mold during bending with a stage and molding requires only a simple metal mold, manufacturing cost can be reduced.SELECTED DRAWING: Figure 5 |
