Process and machine for parting the cap of connecting rods, particularly connecting rods for internal-combustion engines

A machine for parting a cap of a connecting rod, in particular the cap of an internal combustion engine rod, comprising:

• a fixed frame which acts as a rigid and fixed support for a corresponding fixed semicylindrical fixture;
• a movable support for a corresponding movable semicylindrical fixture, said movable support being slideable along guides of said frame, said fixed and movable fixtures being juxtaposable at respective diametrical parting planes to engage an eye of a big end of the connecting rod;
• a hydraulic actuator which is interposed between said semicylindrical fixtures for causing diametrical expansion thereof in a direction of an axis of a shank of the connecting rod;
• fluid feeding means for unidirectionally feeding a stream of hydraulic fluid at a clamping pressure to said hydraulic actuator which is interposed between said fixtures;
• and pressure generating means for producing a momentary pressure peak that are subjected to an action of a striking mass, said striking mass acting on said pressure generating means for producing said momentary pressure peak in said hydraulic actuator and a consequent parting of the cap of the connecting rod.