| 摘要 |
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. |
