Abstract: Method of and apparatus for forming blanks by hydroplastic deformation. In a closed deformation space there is supplied a working fluid under high pressure and, simultaneously, the material of the blank to be deformed which is disposed in the deformation space is subjected to plastic deformation by the working fluid. In the zone of the closed deformation space there is applied a concentrated and controllable impulsed fluid load, this load being applied cyclically at equal time intervals and being controlled along the length of the blank being deformed.The apparatus of the invention comprises a working tool with a blind central hole and radial channels connected thereto, and a female die in which the blank to be deformed is disposed. The working tool is connected to a supply cylinder in which there is provided a pressure chamber, the pressure chamber containing a piston connected to the working tool. The supply cylinder is fastened to the movable part of a press.

Abstract: Method of and tool for the precise and finish processing of profiled cylindrical holes in a metal workpiece, wherein the length to billet diameter ratio of the hole is larger than 3. In accordance with the method of the invention, there is preliminary chip removal along the hole being processed, and the hole is later plastically deformed by fluid fed to the deformation zone thereof under high pressure. Fluid under high pressure is also fed to the zone of chip removal and is directed toward the chips removed from the material.The tool for carrying out the method comprises guiding, cutting, deforming and sizing parts disposed in such sequence and mounted upon a tool body. The tool body is provided with a blind axial hole through which the fluid under high pressure is supplied to the deformation zone of the hole in the workpiece and to the zone of chip removal where it is directed toward the chips removed from the material of the workpiece.