Method of operating a hydrodynamic compression tool and hydrodynamic compression tool

Hydrodynamic compression or cutting tool, comprising:

• an electric motor adapted to be powered by a source of electricity,
• a hydrodynamic group operable by the electric motor and suitable to implement, in response to the movement of the motor, a pressure increase of a hydraulic fluid acting on an actuation piston to move the actuation piston,
• two jaws connected to the housing so as to be movable with respect to each other, of which at least one mobile jaw is connected to the actuation piston so that, in response to the movement of the actuation piston, the jaws perform a relative movement between an open position and a closed position to perform the compression or cutting,
• wherein in the open position the jaws are spaced apart to accommodate the object to be compressed or cut and, in the closed position, the jaws are moved towards each other and in direct contact such as to prevent a further approximation movement thereof, and
• an electronic control system connected to the electric motor and with a user operating member to operate the electric motor,
• wherein the electronic control system comprises:
• monitoring means which monitor the reaching of said closed position and which, on reaching the closed position, generate a confirmation signal,
• an electronic control circuit which stops the actuation of the electric motor automatically in dependency of the confirmation signal that the closed position has been reached, and
• processing means that calculate a residual number of compression or cutting cycles up to a scheduled maintenance of the tool, depending on:
• a predetermined initial residual number of cycles, and
• variable stress values representative for mechanical stresses of the tool in the individual compression or cutting cycles, wherein the mechanical stress values are representative of:
• the maximum compression or cutting forces or
• intervals of maximum compression or cutting force, actually reached during each compression or cutting cycle,
• and the calculation of the residual number of cycles comprises for each cycle out of a sequence of consecutive cycles:
• the calculation of a reduction value depending on the stress value of the current cycle, wherein said reduction value is a variable quantity from one cycle to another depending on the maximum compression or cutting forces actually reached in the individual cycles, and
• the calculation of the residual number of cycles remaining after the completion of the current cycle by subtracting the reduction value from a residual number of cycles calculated for the cycle prior to the current cycle.