| 摘要 |
PURPOSE:To minimize burrs to enhance the accuracy of a sheared surface by a construction wherein the blanking clearance of a press die for shear can automatically be adjusted with a change in the thickness of a sheet to be sheared. CONSTITUTION:An upper die plate B12 and an upper die holder 13 are together fastened upon an upper die plate A11. A slide plate 14 with a punch A10 fixed on the holder 13 is slidably held through a couple of guides. Furthermore, a cotter C is fixed on the holder 13 and attached to a cotter B, forming a pair of cotters. These two pairs of cotters B and C serve to hold the slidable plate 14 from both sides. One of the cotters is slid as far as a specific position by a pulse motor, while the other cotter clamps the holder 13 to allow a change in die width to adjust a blanking clearance correspodingly to the plate thickness of a sheet to be sheared, thus minimizing burrs and improving the accuracy of a sheared surface. |
