| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal plate dowel forming method so as to obtain a smooth worked surface with high squareness without generating any crack when manufacturing a projecting shape on the metal plate. SOLUTION: When a projecting shape is pressed on a metal plate consisting of a medium carbon steel or a high carbon steel by using a punch 2 and a die 3, the die clearance is set to be in a range of the so-called negative clearance of -30 to -5%, in which the length or the diameter of the punch 2 is set to be larger than the length or the diameter of the die 3, and the shoulder radius R of the die is set to be≤10% of the plate thickness. Even in the dowel forming of the height (0.70-0.95)×t (where, t denotes the thickness of the metal plate), the projecting shape of the shear area length of≥50% of the plate thickness and the shear droop length of≤10% of the plate thickness can be easily obtained by employing the negative clearance and the predetermined die R. COPYRIGHT: (C)2007,JPO&INPIT
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