Tie shaft for gas turbine engine and flow forming method for manufacturing same
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United States of America Patent
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Mar 22, 2016
Grant Date -
Jan 23, 2014
app pub date -
Jul 18, 2012
filing date -
Jul 18, 2012
priority date (Note) -
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Abstract
A method is disclosed for manufacturing a tie shaft for aero or land based gas turbine engine. The method includes flow forming a tie shaft preform to produce a tie shaft. In one example, the tie shaft includes a nickel alloy cylindrical wall having a length to diameter ratio of at least 6:1, wherein the diameter is an average outer diameter. The wall includes a minimum effective strain of 0.3 in/in (7.6 mm/mm), and a grain size is in the range of G4 to G16 per ASTM E112. The wall includes a roll formed threaded surface having a thread roughness of less than 1260 μin (32 microns).
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