| 摘要 |
A method for the manufacture of piston rings from a metal strip (7), at least includes providing rings having a predetermined non-circular profile, by the metal strip being first bent to a uniform radius of curvature at least 2 per cent less than the minimum radius of curvature in the predetermined profile, then the curved strip being bent back to increase the radii of curvature of all the constituent portions of the strip forming the ring to the desired values of the predetermined profile. |
