US 7,464,577 B2
Method for fabricating rotary machines
Mark Steven Habedank, Hamilton, Ohio (US); Daniel Edward Wines, Cincinnati, Ohio (US); Mark Wesley Johnson, West Chester, Ohio (US); Gregory Stephen Bechtel, Cincinnati, Ohio (US); and Charles William Carrier, West Chester, Ohio (US)
Assigned to General Electric Company, Schenectady, N.Y. (US)
Filed on Jul. 01, 2004, as Appl. No. 10/882,367.
Prior Publication US 2006/0000089 A1, Jan. 05, 2006
Int. Cl. B21D 41/02 (2006.01)
U.S. Cl. 72—393  [29/889.2; 29/894.362] 12 Claims
OG exemplary drawing
 
1. A method of fabricating a workpiece that includes a bore therethrough, said method comprising:
inserting a tool into the bore in a first axial direction;
applying a predetermined axial force to a tool;
applying a predetermined axial force to the tool to cause the tool to be partially inserted into the bore defined in the workpiece in the first axial direction;
determining a desired axial gap distance that is adjacent to a travel stop face of the tool, wherein the travel stop face limits travel of the tool, and wherein the desired axial gap distance corresponds to the predetermined axial force; and
providing the axial gap that is adjacent to the travel stop face that is approximately equal to the desired axial gap distance;
translating, during insertion of the tool into the bore, the axial force into a radial force in the workpiece using the tool until the axial gap is substantially closed; and
generating a hoop stress in the workpiece using the radial force, wherein the hoop stress is sufficient to at least partially reduce residual stresses in the workpiece.