| 摘要 |
PURPOSE:To elevate a work efficiency by forming a double step edge punch on the corresponding upper die as well as arranging the 1st and 2nd dies on the lower die with providing a vertical driving mechanism on both or one part of the upper and lower dies. CONSTITUTION:A lower die 4 is divided into the 1st die 4a and 2nd die 4b and driven vertically together with a base plate 7 by a cylinder 8. An upper die 5 is composed of the double step punch of a lower edge 5a and upper edge 5b and driven vertically by a cylinder 10. A H-steel 1 is put on a base 15 and the lower die 4 is ascended with the base plate 7 by the driving of the cylinder 8. The upper die 5 is then descended by the cylinder 10 and a scallop is punched from a web in cooperation with the lower die 4. The 2nd die 4b is then retreated via a limit switch 11 and the double step punch 5b punches the remaining scallop. With this double step punching work the work efficiency is remarkably elevated. |
