Method and apparatus for machining the blade tips of rotor wheel drums of turbomachines
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United States of America Patent
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Jan 15, 2013
Grant Date -
May 7, 2009
app pub date -
Aug 20, 2008
filing date -
Aug 30, 2007
priority date (Note) -
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Abstract
With rotor wheel drums with integrally formed-on and/or separately attached blading (3, 8) blade tip machining is performed for the completely mounted drum assembly (1, 5) connected to a driven auxiliary turbomachine shaft acting as workpiece carrier (13) in a single apparatus by dry machining the separably assembled blades (8) and by wet machining the integrally formed-on blades (3), with the rotational speed of the workpiece carrier being lower in the wet machining process than in the dry machining process. The area for dry machining is protected by a shield (19) adjustable in the respective separating position against the matter generated in wet machining. Notwithstanding the fact that drums with integrally formed-on blades can be machined without being damaged, optimum gap conditions and correspondingly higher efficiency can be obtained.
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