| 摘要 |
PURPOSE:To seal superposed metallic plates firmly using simple equipment and method by piercing superposed metallic plates by one press stroke using a die and a punch to cause dislocation, and at the same time, giving lateral growth to the dislocated part. CONSTITUTION:A convex part 28 at the tip of a punch 22 is pressed against metallic plates 25, 26 cut and protruded to inside of a die 21 by the punch 22 with the head abutted to a pressing punch 27, and the convex part 28 is made forcibly to bite into the metallic plate 26. Laterally grown parts of metallic plates 25, 26 are expanded 18 to fill inside of the die 21. Thus, the cut and protruded parts, i.e. metallic plates 25, 26 can be made larger than the hole diameter of metallic plates 23, 24, and the cut and protruded parts do not come out easily from the holes of metallic plates 23, 24, and joining strength can be increased. |
