Method and apparatus for producing beneficial stresses...

B - Operations – Transporting – 23 – P

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B23P 9/02 (2006.01) B21D 28/24 (2006.01) B21J 5/00 (2006.01) B21J 15/00 (2006.01) B21J 15/38 (2006.01) B23P 9/04 (2006.01) B24B 39/06 (2006.01) C21D 7/02 (2006.01) C21D 7/04 (2006.01)

Patent

CA 2323779

Tooling and a method of employing tooling (90, 130) to produce beneficial stress waves in a substrate (132) to provide high fatigue life structures. Stress waves (159, 152) are provided to work a substrate, causing dimples (170) in the workpiece, along a uniform pressure profile in the workpiece. By use of the method, uniform beneficial residual stress is provided at surface and midplane apertures in a workpiece, so as to improve overall fatigue life. An improved tool shape (92) is described, having a smooth curve, rather than a flat punch. Also, the use of a consumable wafer (W) provides additional uniform stress profile benefits.

L'invention concerne un outillage et un procédé d'utilisation d'un outillage (90, 130) afin de produire des ondes d'effort avantageuses dans un substrat (132) pour produire des structures présentant une haute résistance à la fatigue. Des ondes d'effort (159, 152) sont produites pour usiner un substrat, provoquant la formation de cratères (170) dans la pièce à usiner, avec un profil de pression uniforme dans la pièce à usiner. L'utilisation du procédé permet d'obtenir un effort résiduel uniforme avantageux dans les ouvertures de la surface et du plan médian d'une pièce à usiner afin d'améliorer la résistance globale à la fatigue. Une forme (92) d'outil amélioré est décrite, présentant une courbe douce plutôt qu'un poinçon plat. De même, l'utilisation d'une tranche consommable (W) procure des avantages de profil d'effort uniforme supplémentaires.

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