| 摘要 |
PURPOSE:To obtain a perforated metallic plate without generating a material loss by making a hole by a roller having a lot of projections, turning back its return by a scratching jig, and thereafter, executing a rolling by a roller. CONSTITUTION:As for a perforating roller 3, a saw tooth-shaped projection 2 is provided in a line in the circumferential direction and the width direction. A metallic plate 1 is fed continuously between this roller 3 and a receiving roller 2. A hole 4 is made by the projection 2, and a return 6 is cut and raised. The metallic plate 1 is fed continuously and the return 6 hits against the tip of a scratching jig 5. The return 6 is turned back, and thereafter, rolled by a rolling roller 7. The metallic plate 1 is rolled thinly and elongated, and also the return 6 is allowed to gnaw as one body with the metallic plate 1, and a perforated metallic plate having no burr is obtained. Since there is no punching dust, no material loss is caused, and no burr is generated, therefore, this metallic plate can be handled easily. |
