A hydraulic forming machine, includes a hydraulic cylinder with a piston guided in a cylinder tube and divides the cylinder tube into a first cylinder chamber, and a second cylinder chamber. A hydraulic circuit with a control unit for controlling the operation of the hydraulic cylinder includes a first hydraulic valve coupled to the control unit and is connected to the second cylinder chamber via the second hydraulic connection. The control unit regulates an opening width of the first hydraulic valve such that the first hydraulic valve is open in a first phase and the bear) is accelerated to a target speed in the first phase, while, in a following second phase the opening width of the first hydraulic valve is reduced to an inflow opening width, and the first hydraulic valve is closed during a return stroke running in the opposite direction to the working stroke.

A hydraulic forming machine, includes a hydraulic cylinder with a piston guided in a cylinder tube and divides the cylinder tube into a first cylinder chamber, and a second cylinder chamber. A hydraulic circuit with a control unit for controlling the operation of the hydraulic cylinder includes a first hydraulic valve coupled to the control unit and is connected to the second cylinder chamber via the second hydraulic connection. The control unit regulates an opening width of the first hydraulic valve such that the first hydraulic valve is open in a first phase and the bear) is accelerated to a target speed in the first phase, while, in a following second phase the opening width of the first hydraulic valve is reduced to an inflow opening width, and the first hydraulic valve is closed during a return stroke running in the opposite direction to the working stroke.

A workpiece processing apparatus comprises a base member, a slider located above the base member and a punch projecting downward from the slider. The base member is formed with a hydraulic chamber fillable with liquid. The hydraulic chamber has a workpiece processing chamber and a hydraulic-pressure generation chamber which are coupled together. Each of the workpiece processing chamber and the hydraulic-pressure generation chamber extends in the upper-lower direction and opens upward. The base member comprises a piston which is partially received in the hydraulic-pressure generation chamber. When the slider is moved downward, the punch is moved downward and presses the workpiece into the workpiece processing chamber, and the piston receives a downward force and is moved downward. The thus-moved piston increases hydraulic pressure of the liquid.

A workpiece processing apparatus comprises a base member, a slider located above the base member and a punch projecting downward from the slider. The base member is formed with a hydraulic chamber fillable with liquid. The hydraulic chamber has a workpiece processing chamber and a hydraulic-pressure generation chamber which are coupled together. Each of the workpiece processing chamber and the hydraulic-pressure generation chamber extends in the upper-lower direction and opens upward. The base member comprises a piston which is partially received in the hydraulic-pressure generation chamber. When the slider is moved downward, the punch is moved downward and presses the workpiece into the workpiece processing chamber, and the piston receives a downward force and is moved downward. The thus-moved piston increases hydraulic pressure of the liquid.

Disclosed is a lightweight two crossbeam high-speed free forging hydraulic press. The hydraulic press includes a fixed crossbeam, a movable crossbeam, a column, and a return oil cylinder. By integrating a hydraulic cylinder with a through hole for the column to slide, an annular hydraulic cylinder is formed between the movable crossbeam and the column, and no hole is required to be specially provided on the movable crossbeam for mounting the hydraulic cylinder. Therefore, the rigidity, strength and bending resistance of the movable crossbeam serving as an upper crossbeam or a lower crossbeam can be effectively guaranteed, the crossbeam structure is simplified, and the manufacturing difficulty is reduced. Meanwhile, compared with the existing hydraulic press of a three-crossbeam structure, the two-crossbeam hydraulic press can greatly reduce the overall dimension and mass of the high-speed forging hydraulic press, reduce the overall height of the hydraulic press.

Disclosed is a lightweight two crossbeam high-speed free forging hydraulic press. The hydraulic press includes a fixed crossbeam, a movable crossbeam, a column, and a return oil cylinder. By integrating a hydraulic cylinder with a through hole for the column to slide, an annular hydraulic cylinder is formed between the movable crossbeam and the column, and no hole is required to be specially provided on the movable crossbeam for mounting the hydraulic cylinder. Therefore, the rigidity, strength and bending resistance of the movable crossbeam serving as an upper crossbeam or a lower crossbeam can be effectively guaranteed, the crossbeam structure is simplified, and the manufacturing difficulty is reduced. Meanwhile, compared with the existing hydraulic press of a three-crossbeam structure, the two-crossbeam hydraulic press can greatly reduce the overall dimension and mass of the high-speed forging hydraulic press, reduce the overall height of the hydraulic press.