| 摘要 |
A method of making micro-holes on a metal plate includes: A. feeding a metal plate on a workbench (1) forward to extend beyond a shearing edge (11); B. locating a punching head (3) at a first position (Y1), and keeping a working space (S) between said punching head (3) and the workbench (1); C. the punching head (3) exerts a shearing force towards the workbench (1); D. the metal plate is bent by the shearing force, and a plurality of spot-shaped cavities (4) arranged in rows are formed on a second surface (22); E. the first surface (21) of the metal plate bears the shearing force and a linear groove (5) is formed on said first surface (21); F. the shearing force deforms the metal plate, causing the spot-shaped cavities (4) arranged in rows to communicate with the linear groove (5), thus forming micro-holes (6); G. the punching head (3) returns to the first position, and moves a working distance (T) to a second position (Y2); H. the metal plate is fed forward again; I. the punching head (3) repeats steps C, D, E, F at the second position (Y2); J. the punching head (3) returns to the second position, then moves to the first position (Y1), thus completing a processing cycle. The method can produce a maximum of micro-holes on a certain area of a metal plate, which can be used as a sound gobo with an enhanced sound-absorption rate. |
