Shot Peen Gears For Longer Life
Author: McCormick, Doug
Source: Design Engineering, July 1981
Doc ID: 1981060
Year of Publication: 1981
Abstract:
Shot peening is a method of producing a residual compressive stressed layer on metal surfaces by bombarding with bird-shot-size pellets. This compressive surface layer can increase fatigue life, prevent pitting, reduce stress corrosion and increase corrosion resistance. The shot peening process is described in conjunction with factors that determine its effectiveness, such as type, hardness, uniformity, dia. and mass of the shot; the shot stream velocity; the duration of shot treatment; the distance from nozzle to workpiece; and the angle of impact. The Almen test method of quantifying all of these factors is described along with the Peenscan method for insuring complete coverage. Several examples are given on how shot peening is effectively used in gear manufacturing (4140, 4340 and 9310 steels). As a result of shot peening, smaller, stronger and lighter gears are being used in automobiles, aircraft, agriculture and marine and turbine propulsion systems.
Descriptors: Gears-- Structural hardening; Low alloy steels-- Structural hardening; Shot peening; Fatigue life; Tensile properties; Residual stress
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