CPC B21D 31/06 (2013.01) [B21D 1/06 (2013.01); B21D 1/12 (2013.01); B21D 22/00 (2013.01); B21D 22/02 (2013.01); B21D 22/06 (2013.01); B21D 22/18 (2013.01); B21D 37/00 (2013.01); B21D 53/88 (2013.01)] | 20 Claims |
1. A driven member of a metal peening machine, the metal peening machine being configured to drive the driven member, in a driving direction, into contact with a work surface of a metal workpiece to deform the metal workpiece, the driven member comprising:
a shaft comprising an impact end; and
a plurality of impact features, wherein each one of the plurality of impact features:
is coupled to and protrudes, in a direction, a distance from the impact end of the shaft;
comprises an impact surface to be driven into contact with the work surface of the metal workpiece, the impact surface being one of flat or rounded;
has a width, perpendicular to the direction and at least as great as the distance; and
is fixed relative to the shaft, such that each one of the plurality of impact features is not movable relative to the shaft;
wherein:
the plurality of impact features are arranged, about the impact end, in a pattern which is asymmetrical relative to any possible plane, parallel to the direction, that bisects the pattern;
at least one of the impact features of the plurality of impact features defines an impact surface with a non-circular peripheral shape in a plane perpendicular to the driving direction; and
the non-circular peripheral shape of the impact surface is asymmetrical.
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