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Joined: Nov 2007
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Amit Offline OP
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We have recently started peening of spur and helical gears. The equipment we are using is a wheel type machine wherein a stack of gears are rotated in front of a vertical wheel. The arc height and saturation curves are fine.

But we are getting bulge at the gear tip after peening. This phenomenon is not same for all the teeth but varies and some even do not show any bulging. What we desire is that either there should be no bulging or the bulging should be uniform so that we can compensate for it in gear grinding [before peening].

Any helpful suggestions will be highly appreciated.

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Amit Offline OP
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I would like to add the following information related to the topic:

Peening Specs:

Intensity – 0.4 to 0.55 mm on ‘A’ Strip
Coverage – 100%
Shot Size – CCW-23
Shot Hardness – 610-670 HV1

Material of Gear - 20MnCr5
Case Hardening - depth 0.4mm to 0.7mm
Surface Hardness - 81 to 83 HRA

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Have you done hardness testing to be sure that the bulging is not related to hardness issue?
Are you sure that the gears are always presented to the shot blast in a given manner? i.e. if the rotation of the gear during the shot blast might leave some gear teeth exposed for a longer period.

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The gear manufacturer is sure that the hardness is as per requirement and we have confirmed that the gear teeth pass through uniformly and at a given speed through the blast zone.


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