Method for work-hardening by rolling a component

Details Method for work-hardening by rolling a component Method for work-hardening by rolling a component

1995-09-22

1997-09-16

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

29DIG49, B21B 108

Patent

active

056668414

ABSTRACT:
A method for work-hardening a component to be loaded along a loading axis includes rolling in a notch extending approximately at right angles to the loading axis. The notch has a minimum radius of curvature to be determined in a cross-section parallel to the loading axis. The notch is work-hardened by rolling along a plurality of tracks being adjacent one another along the loading axis and being directed approximately at right angles to the loading axis, with each track covering only a part of the notch. Compressive internal stresses are generated which have axial components and tangential components relative to the loading axis. The axial components are substantially larger than the tangential components. The method is particularly suitable for work-hardening by rolling of a retention groove in a root part of a turbine blade.

REFERENCES:
patent: 4448053 (1984-05-01), Holmstrom
patent: 5099558 (1992-03-01), Wilson
Derwent Publ. 1987, 1 page, SU 1258-577-A, "Device for strengthening roots of gear teeth-has disc made".
Frauenhofer-Institut fur Werkstoffmechanik Publication (Prummer et al.), pp. 63-71, "Eigenspannungsausbildung".
Publication Berstein et al., pp. 89-115, "Festwalzen-Anwendungsbereich,Voraussetzung,Maschinen".
German Assoc.for Material Testing Publ.,Berlin 1983, (Broszeit),pp. 7-22,"Festwalzen und Glattwalzen . . . ".
Stahl u. Eisen Publ. 104 (1984) No.14, pp.657-660, (von Finckenstein et al.) "Eigenspannungen beim . . . ".
Institut fur Werkstoffkunde, TH Darmstadt, pp.23-47, "Ermudungseigenschaften festgewalzter Probestabe".

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