| 摘要 |
Method for manufacturing a nut by the progressive press forging of a laminar metal sheet and resulting nut, in which said method comprises the steps of: - producing a piece with a supporting washer (3), a dome (2) and an emergent hexagonal part (3) by press forging starting from a laminar metal sheet of material of suitable thickness, said piece being of uniform thickness; and - creating a threaded internal cylinder (5) by progressive press forging of the interior of said hexagonal emergent part (1), displacing material laterally from the central zones (7) of said faces (4) to the zones (7') of the angles, - heat treating the piece obtained, treatment intended to provide the piece with greater strength, especially a yield strength Rp 0.2% of approximately 1200 MPa and a tensile strength Rm of approximately 1400 MPa. |
