| 摘要 |
PURPOSE:To enhance manufacturing efficiency of a punch by a method wherein the grinding and working operation of a required face, the formation of a comb tooth-shaped blade part by a rotary blade and the formation of an outer shape are performed continuously. CONSTITUTION:Only both the surface and the rear surface 1, 2 of a tungsten carbide sheet 1' which has been cut to a prescribed size are planar-ground and worked as a previous process. Then, the side on which a comb tooth-shaped blade part in the tungsten carbide sheet 1' is formed and the side opposite to it are cut 3', 4' by using a rotary blade, both side faces 3, 4 are formed, a size L in the lengthwise direction is set and a tiebar body 1 is formed. In addition, a long-side side-face part in the body 1 is cut 5' by using the rotary blade, and comb tooth-shaped blade parts 2 are formed at a prescribed pitch on the short-side side face 4 by using a cut face 5 as a reference. After that, the long-side side-face part in the body 1 is cut 6' by the rotary blade, a side face 6 is formed, and a tie-bar punch 3 is completed. All operations other than the grinding and working operation of a required face can be performed by the rotary blade, the operations can be performed continuously and the manufacturing efficiency of the tiebar punch can be increased remarkably. |
