Shot, devices, and installations for ultrasonic peening, and parts treated thereby

Abstract

Shot for use in a peening installation, the shot having: hardness greater than or equal to 800 HV; density greater than or equal to 8 g / cm3; and pieces having a maximum dimension less than or equal to 1.5 mm.

Description

[0001] This non provisional application claims the benefit of French Application No. 04 08493 filed on Jul. 30, 2004 and U.S. Provisional Application No. 60 / 599,364 filed on Aug. 6, 2004.[0002] The present invention relates to shot, devices, and installations for ultrasonic peening, and also to parts thus treated by peening. BACKGROUND [0003] Methods and installations for ultrasonic peening are described in particular in French patents FR 2 815 280 and FR 2 815 281, using at least one sonotrode comprising a titanium body for putting shot into motion for inducing compression stresses in the treated part. [0004] The following publications also relate to ultrasonic peening: U.S. Pat. No. 6,490,899 B2, U.S. Pat. No. 6,343,495 B1, U.S. Pat. No. 6,467,321 B2, U.S. Pat. No. 6,336,844 B1, U.S. Pat. No. 6,289,705 B1, U.S. Pat. No. 6,508,093 B2, US 2003 / 0115922 A1, U.S. Pat. No. 6,505,489 B2, and U.S. Pat. No. 6,536,109 B2. [0005] The shot used and described in the past in those patents mainl...

AI Technical Summary

Benefits of technology

[0010] The use of such shot makes it possible to treat zones that are difficult to access using conventional pieces having small radii of curvature, and in particular less than 1.5 mm, the shot nevertheless being capable of acquiring sufficient kinetic energy to generate the desired level of stress in the part and remaining compatible with the use of a sonotrode.

[0038] The path between the vibrating surface of the sonotrode and the treated part can be shortened and, for example, the cavity can be made to have inclined faces contributing to directing the shot towards certain zones of the part for treatment, which zones would otherwise be more difficult to reach, and / or contributing to reducing the angle of incidence of the shot, thereby increasing its impact force and reducing treatment time.

Problems solved by technology

The use of such shot does not enable treatment to be sufficiently intense on concave surfaces that present a radius of curvature smaller than that of the balls, or in the bottoms of certain setbacks.

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