Method for simultaneous peening and smoothing

Details Method for simultaneous peening and smoothing Method for simultaneous peening and smoothing

1981-09-10

1984-06-19

Crosby, Gene P.

Metal deforming

By shot-blasting

C21D 706

Patent

active

044547404

ABSTRACT:
A method for simultaneously shot peening and smoothing includes use of relatively large, smooth, hard, spherical steel shot having a substantially uniform diameter in the range 1-2.5 mm. Titanium workpieces are provided in one step with a compressive stress layer of the order of 0.13 mm and a surface finish of better than 15.times.10.sup.-6 inch AA, compared to conventional peened finishes of the order of 40.times.10.sup.-6 inch AA. Surface finish and peening intensity are inter-related and dependent on shot diameter, mass, velocity, and energy within relatively small limits. The shot diameter is uniform within .+-.0.05 mm; the shot impact velocity is uniform within .+-.4 percent or less, in the range 1.4-12 m/s.

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patent: 3705511 (1972-12-01), Brandel
patent: 4034585 (1977-07-01), Straub
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