초록 ▼

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

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.

대표청구항 ▼

A method of preparing a pin in tight press-fitting relation within a bore in a workpiece, comprising: sizing and locally strengthening a bore in a workpiece by the steps comprising: establishing a predetermined size for the bore; forming an undersized version of said bore in a workpiece; increasing

A method of preparing a pin in tight press-fitting relation within a bore in a workpiece, comprising: sizing and locally strengthening a bore in a workpiece by the steps comprising: establishing a predetermined size for the bore; forming an undersized version of said bore in a workpiece; increasing the size of said bore by the steps of applying a hydrostatic pressure to the walls of said bore, raising said pressure to exceed the yield strength of said workpiece locally of the walls of said bore and continuing said pressure until the walls of said bore have yielded and deformed to said predetermined size and been locally strengthened; and press-fitting a pin within said bore.