| 摘要 |
PURPOSE:To set a bend with small working force and to improve bending accuracy by inserting externally a backup surface of a punch onto the setting surface of a die to increase the rigidity of the die and setting the bent part by coining. CONSTITUTION:A bend setting press die consisting of the outside of a setting surface 2, a die 1 provided with a guide part 3, and a punch 11 is prepared. Said punch 11 is provided with a punching part 12, and its end part is rounded 13. The radius at the tip of the part 12 is made smaller than the radius at the top of the bending punch in the previous stage. A backup surface 14 inserted slidably onto the guide part 3 is provided on the outside enclosing the part 12. The bent part of the work W is set by coining using the above-mentioned press die. The work W is thus bent to the bending radius smaller than the radius of the die 1 and to the shape of the vertical wall flaring upward. |
