| 摘要 |
<p>A method for manufacturing a piece (1, 2, 10) including metal plate or strip material (5) used in the construction industry, in which method holes (3, 4, 9, 11) are formed in the metal plate or strip material (5) by pressing a depression into the plate or strip material (5) with a punch in the place where a hole is to be formed, at which time, the bottom of the depression is split simultaneously by the tip of the punch by folding strip material (5) in the direction of the depression from the edges of the slit formed in the plate or strip material (5) and from the ends of the material surrounding the hole. The invention also concerns a piece (1, 2, 10) manufactured by the method.</p> |
