Method for straightening out of true work pieces, especially cra

Details Method for straightening out of true work pieces, especially cra Method for straightening out of true work pieces, especially cra

1993-07-23

1994-08-02

Larson, Lowell A.

Metal deforming

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

During rotation of work

72 73, 72 74, B21H 700, B21D 316

Patent

active

053334809

ABSTRACT:
A truing operation for straightening out of true work pieces such as crankshafts, must not again reduce the fatigue strength of the work piece achieved in a previous strengthening operation. This is achieved by a truing operation, wherein locally bounded compressive residual stresses are induced in a surface layer zone of the work piece by a hardening operation, whereby the respective out of true deformation of the work piece is at least reduced. The truing operation is repeated until the out of true deformation is eliminated. The compressive residual stresses are induced in a surface layer zone of the work piece by a locally limited hardening operation, e.g. a surface strengthening rolling operation. By appropriately varying the extent of hardening or the rolling force respectively, any out of true deformation may be even completely eliminated. A machine for performing the method is also disclosed.

REFERENCES:
patent: 4416130 (1983-11-01), Judge, Jr.
patent: 4561276 (1985-12-01), Berstein
patent: 4860566 (1989-08-01), Augustin
patent: 5001917 (1991-03-01), Berstein
patent: 5235838 (1993-08-01), Berstein

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