Title:
METHOD AND APPARATUS FOR MANUFACTURING STRUCTURES WITH IMPROVED FATIGUE LIFE
Document Type and Number:
WIPO Patent Application WO2001058617
Kind Code:
A9
Abstract:
A compound indenter (18) for metal coldwork, and a method of employing such tooling. The compound indenter tool (18) is used to produce deformation in a workpiece structure (30), to provide a selected beneficial residual stress profile in the workpiece (30), in order to provide high fatigue life structures in a minimum number of manufacturing steps. Preferably, action of a compound indenter (18) causes deformation of the workpiece, causing dimples in the workpiece. An improved, compound indenter tool profile shape is described, having a first, elongate indenter (20) with a shaped indenter surface portion, and a second shaped indenter (22) surrounding the first indenter and forming an annular shoulder (44) recessed from the surface portion of the first indenter. Additionally, a foot (60) having a bottom portion (80) can be used to confiningly surround the second indenter during application of force to the surface of a workpiece, to prevent surface deformation.
Inventors:
EASTERBROOK ERIC T
JUHLIN NILS
JUHLIN NILS
Application Number:
PCT/US2001/004240
Publication Date:
April 18, 2002
Filing Date:
February 09, 2001
Export Citation:
Assignee:
STRESSWAVE INC (US)
International Classes:
F16B19/06; B21D22/04; B21J5/02; B21J15/00; B21J15/10; B23P9/04; C21D7/02; (IPC1-7): B21D28/00
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