| 摘要 |
PURPOSE: A double piercing press apparatus is provided which is equipped with two cams so that two piercing holes are perforated in one piercing operation by simultaneously driving the cams, and in which the two piercing holes are perforated by one piercing process to reduce operation time and cost. CONSTITUTION: The double piercing press apparatus comprises an upper mold die(23) for pressing an upper part of panel(21) of the car body; a pad(25) mounted on a lower part of the upper mold die to fix the car body panel by pressurizing the car body panel during descending of the upper mold die; a lower mold die(27) arranged at a lower part of the upper mold die to support the car body panel; first cam(29) movably mounted on an upper part of the lower mold die and connected with the upper mold die during descending of the upper mold die so that the first cam performs piercing operation on a part of the car body panel; and second cam(31) movably mounted on a lower part of the pad and connected with the first cam during forward movement of the first cam so that the second cam performs piercing operation on another part of the car body panel, wherein an inclination plane(37) is formed on one side of the first cam so that the first cam is movable in a direction of the car body panel with the first cam being contacted with a pressing part(33) projected downward from the upper mold die, and first piercing punch(39) is mounted on the other side of the first cam so that the first piercing punch punches a piercing hole on a part of the car body panel.
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