| 摘要 |
PROBLEM TO BE SOLVED: To improve the quality of a formed part, to increase energy efficiency in forming an overhang and to raise the yield of materials in forming the overhang. SOLUTION: By making both edge parts of a sheet-metal workpiece W slide in the separating direction each other and in the same direction as the direction M in the extended surface of a forming surface 21 of a punch 20 or in an inclined direction to the side of the punch 20 than that, it is prevented that a sharp bent part and a longitudinal wall part are formed so as to hinder the extension of the formed part W1 on the sheet-metal workpiece W. Thus, because the formed part W1 is satisfactorily extendable, the improvement of quality is attained and energy is spendable efficiently to extend the formed part. Further, because the longitudinal wall part is not formed, the yield is raised. COPYRIGHT: (C)2011,JPO&INPIT |
