Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1988-03-21
1989-12-26
Echols, P. W.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
29557, 20412943, 219 6911, 219 6917, B21K 304
Patent
active
048888630
ABSTRACT:
A method and apparatus for producing turbine blade roots (23) utilize an electro-discharge machining apparatus (10) to machine critical portions of the blade root (23) and a peening apparatus (25) for peening of the machined portions. The electro-discharge machining of the blade root leaves recast layers (22) on the surface of the blade root (23), and high residual tensile stresses are found in the surface of the blade root (23), which could lead to crack propagation. Peening of the machined surfaces leaves compressive residual stresses near the surface and reduces the recast layers (22). The resulting blade root (23) meets the same specifications for durability and tolerances as a blade root machined using the conventional transfer line type cutting process, but at a fraction of the cost.
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"Shot Peeniny Applications", Metal Movement Co. Inc, 6th Ed., 1980, U.S.A. pp. 30 & 35.
"Glass Bead Impact Blasting" by Michael Woelfel & Robert Mulhall, Metal Progress, vol. 122, #4, Sep. 1982
Cox Jimmy A.
Wilson Ian L.
Cuda Irene
Echols P. W.
Westinghouse Electric Corp.
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