Metal working – Method of mechanical manufacture – Shaping by direct application of fluent pressure
Patent
1975-07-14
1977-09-13
Lanham, C.W.
Metal working
Method of mechanical manufacture
Shaping by direct application of fluent pressure
29446, 29525, 72 56, 138 31, B23P 1700, B23P 1902
Patent
active
040472779
ABSTRACT:
A method and apparatus for enlarging a bore in a work piece including means for sealing the bore, a source of hydraulic fluid and a hydraulic pressure amplifier for introducing the fluid into the cylindrical bore and amplifying the pressure of the fluid to a value exceeding the yield strength of the work piece, thereby forcing the walls of the bore to yield until the bore reaches a predetermined diameter. The hydraulic amplifier means includes a plurality of series connected cylinders of increasing diameter so that the fluid acting on each cylinder is multiplied by the pressure of the preceding cylinder.
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Caterpillar Tractor Co.
Crane Daniel C.
Lanham C.W.
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