Method or repairing trailing edge portions of partitions in turbine diaphragms
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United States of America Patent
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Jun 29, 2004
Grant Date -
N/A
app pub date -
Jan 30, 2003
filing date -
Jan 30, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Using sinker electrode discharge machining tools, damaged portions of partitions of the turbine which have been removed and replaced with weld material of increased thickness may be shaped and contoured to blend with the suction and pressure sides of the partitions. The diaphragm containing the partitions is located in a tank containing dielectric material. A numerically controlled EDM machine directs first and second sinker EDM tools having surfaces corresponding to designed surfaces of the trailing edge portions of the partitions applied to contour and shape the opposite surfaces of the weld material to blend with the pressure and suction sides of the partitions. A third EDM tool is used to shape the juncture at opposite ends of each partition with the arcuate surfaces of the inner and outer bands.
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