Metal plate reinforcement method

Abstract

A metal plate reinforcement method includes: (a) providing a metal plate, in which the metal plate has a first surface and a second surface opposite to each other; (b) stamping the metal plate to form a plurality of first protruding portions protruding from the first surface; (c) respectively stamping the first protruding portions so as to respectively form a plurality of second protruding portions protruding at the second surface; and (d) flattening the second protruding portions to restore the metal plate.

What is claimed is: 
     
         1 . A metal plate reinforcement method, comprising:
 (a) providing a metal plate, wherein the metal plate has a first surface and a second surface opposite each other;   (b) stamping the metal plate to form a plurality of first protruding portions protruding from the first surface;   (c) respectively stamping the first protruding portions, so as to respectively form a plurality of second protruding portions protruding from the second surface; and   (d) flattening the metal plate.   
     
     
         2 . The metal plate reinforcement method of  claim 1 , wherein the metal plate has a first edge and a second edge opposite each other, and a stamping zone formed by the first protruding portions extends between the first edge and the second edge. 
     
     
         3 . The metal plate reinforcement method of  claim 2 , wherein the first protruding portions are more concentrated near a center zone between the first edge and the second edge, and the second protruding portions are more concentrated near the center zone. 
     
     
         4 . The metal plate reinforcement method of  claim 1 , wherein each of the first protruding portions has a same shape and size, and each of the second protruding portions has another same shape and size. 
     
     
         5 . A metal plate reinforcement method, comprising:
 (a) providing a metal plate, wherein the metal plate has a first surface and a second surface opposite each other;   (b) stamping a plurality of first protruding portions on the metal plate to protrude from the first surface;   (c) stamping a plurality of second protruding portions on the metal plate to protrude from the second surface; and   (d) flattening the metal plate.   
     
     
         6 . The metal plate reinforcement method of  claim 5 , wherein the metal plate has a first edge and a second edge opposite each other, the first protruding portions and the second protruding portions form a stamping zone and are uniformly distributed at the stamping zone, and the stamping zone extends between the first edge and the second edge. 
     
     
         7 . The metal plate reinforcement method of  claim 6 , wherein the first protruding portions are more concentrated near a center zone between the first edge and the second edge, and the second protruding portions are more concentrated near the center zone. 
     
     
         8 . The metal plate reinforcement method of  claim 5 , wherein each of the first protruding portions has a same shape and size, and each of the second protruding portions has another same shape and size.