Hydraulic Forging Machine And Method Of Replacing Upper Anvil Thereof

A method of replacing an upper anvil block of a hydraulic forging machine, the hydraulic forging machine comprising:

• a movable beam;
• an upper anvil block being fixedly connected to the movable beam;
• a locking hydraulic cylinder being fixedly connected to the movable beam;
• a connecting pipe being fixedly connected to the movable beam;
• a control valve provided on the connecting pipe;
• a hydraulic power source for the locking hydraulic cylinder, the hydraulic power source being fixedly connected to the movable beam;
• a main hydraulic cylinder;
• and
• a return hydraulic cylinder being fixedly connected to the movable beam,
• wherein:
• a first end of the connecting pipe is connected to the locking hydraulic cylinder,
• a second end of the connecting pipe is connected to a pressurized oil chamber of the hydraulic power source,
• the return hydraulic cylinder serves as the hydraulic power source of the locking hydraulic cylinder,
• the locking hydraulic cylinder is configured to provide a locking-unlocking function between the upper anvil block and the movable beam,
• the locking-unlocking function is realized by pressurized oil flowing between the locking hydraulic cylinder and the pressurized oil chamber of the hydraulic power source via the control valve and the connecting pipe,
• a first end of the main hydraulic cylinder is connected to a fixed beam, and
• a second end of the main hydraulic cylinder is fixedly connected to the movable beam, and
• the method comprising:
• a demounting step, comprising:
• placing an original upper anvil block on a lower anvil block;
• turning on the control valve to allow the pressurized oil to enter the pressurized oil chamber of the return hydraulic cylinder and subsequently the locking hydraulic cylinder via the connecting pipe and the control valve;
• unlocking the original upper anvil block from the movable beam as an oil pressure inside the locking hydraulic cylinder is increased;
• and
• separating the movable beam from the original upper anvil block by further increasing an oil pressure inside the pressurized oil chamber of the return hydraulic cylinder to raise the movable beam;
• a mounting step, comprising:
• placing a new upper anvil block on the lower anvil block;
• aligning the new upper anvil block with the movable beam;
• supplying pressurized oil to the main hydraulic cylinder to lower the movable beam so that the movable beam engages with the new upper anvil block;
• and
• discharging the pressurized oil from the locking hydraulic cylinder to the pressurized oil chamber of the return hydraulic cylinder so that the locking hydraulic cylinder locks the new upper anvil block to the movable beam;
• and
• a final step, comprising:
• turning off the control valve after the upper anvil block is replaced.