Metal working – Means to assemble or disassemble – Including means to relatively position plural work parts
Patent
1989-03-27
1991-09-24
Watson, Robert C.
Metal working
Means to assemble or disassemble
Including means to relatively position plural work parts
B23P 1504
Patent
active
050502875
ABSTRACT:
A method of assembling a rotor of a steam turbine constituted by disks (2) shrunk onto a shaft, said disks (2) being provided with cavities (4) facing one another and having female pegs (5) disposed in said cavities in one disk (2) and male pegs (6) disposed in the facing cavities (4) of an adjacent disk (2) with each of the disks (2) being shrunk on while disposing the male pegs (6) of said disks into the female pegs (5) of the already shrunk-on adjacent disk, the method being characterized in that spacer means (12) are provided in the female pegs (5) prior to inserting the male pegs (6) in the female pegs (5) so that the male pegs (6) do not come into contact with the female pegs (5), with the spacer means (12) subsequently being removed. A fork for use in the method of the invention and in conjunction with a male peg (6) comprising a tenon (8 ) having two walls parallel to the axis of the rotor and at a spacing a, and a female peg (5) having a complementary slot (10) with two walls parallel to the walls of the tenon (8) and at a spacing of a+2d, the fork being characterized in that it comprises a handle (13) and two tines (14) of thickness slightly less than d, with the outside edges (15) being at a spacing of a+2d and which are capable of being disposed against the walls of the slot (10). By keeping associated pegs spaced apart during assembly and overspeed testing, it is possible to avoid stress corrosion during operation.
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Alsthom S.A.
Watson Robert C.
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