High-speed hydraulic forging press

A high-speed hydraulic forging press, comprising:

• a forging hammer;
• a movable beam;
• a main hydraulic cylinder;
• a single-rod elevation hydraulic cylinder;
• a plurality of main hydraulic pumps;
• a high-pressure energy accumulator;
• an intermediate-pressure energy accumulator;
• an oil tank;
• a programmable logic controller;
• a piping system comprising a plurality of pipes and capable of transmitting hydraulic oil;
• and
• a valve-regulation system disposed on the piping system,
• wherein:
• the piping system is connected with the main hydraulic cylinder, the single-rod elevation hydraulic cylinder, the plurality of main hydraulic pumps, the high-pressure energy accumulator, the intermediate-pressure energy accumulator and the oil tank,
• the main hydraulic cylinder is a plunger-type hydraulic cylinder,
• one end of a single rod of the single-rod elevation hydraulic cylinder, one end of a plunger of the main hydraulic cylinder and the forging hammer are fixedly connected to the movable beam,
• when the forging hammer rises, the programmable logic controller controls the valve-regulation system so that the hydraulic oil in a rod cavity of the single-rod elevation hydraulic cylinder is supplied by the plurality of main hydraulic pumps pumping the hydraulic oil from the oil tank, and that the hydraulic oil in the main hydraulic cylinder is discharged into the intermediate-pressure energy accumulator,
• when the forging hammer drops, the programmable logic controller controls the valve-regulation system so that the hydraulic oil in the main hydraulic cylinder is solely supplied by the intermediate-pressure energy accumulator, that the hydraulic oil in the rod cavity of the single-rod elevation hydraulic cylinder is discharged into the oil tank, and that the main hydraulic cylinder supplies the hydraulic oil to the high-pressure energy accumulator to accumulate energy therein,
• when the forging hammer touches a workpiece, the programmable logic controller controls the valve-regulation system so that the hydraulic oil in the main hydraulic cylinder is supplied by the main hydraulic pumps and the high-pressure energy accumulator, and
• when a resistance applied to the forging hammer by the workpiece increases causing pressure in the main hydraulic cylinder to reach a first predetermined value, the programmable logic controller controls the valve-regulation system so that the high-pressure energy accumulator stops supplying the hydraulic oil to the main hydraulic cylinder, and that the hydraulic oil in the main hydraulic cylinder is supplied by at least one of the plurality of main hydraulic pumps.