Workpiece processing apparatus

A workpiece processing apparatus configured to use hydraulic pressure to process a workpiece of an object, the workpiece processing apparatus comprising:

• a main member;
• and
• a slider;
• wherein:
• the main member comprises a base member and a punch;
• the slider is located above the base member in an upper-lower direction and is movable between an upper position and a lower position in the upper-lower direction;
• the punch projects downward from the slider and is configured to move in the upper-lower direction in accordance with a movement of the slider in the upper-lower direction;
• the base member is formed with a hydraulic chamber;
• the hydraulic chamber is fillable with liquid;
• the hydraulic chamber has a workpiece processing chamber, a hydraulic-pressure generation chamber and a coupling chamber;
• each of the workpiece processing chamber and the hydraulic-pressure generation chamber extends in the upper-lower direction and opens upward;
• the coupling chamber couples the workpiece processing chamber and the hydraulic-pressure generation chamber together in a front-rear direction perpendicular to the upper-lower direction;
• the base member comprises a piston;
• the piston is partially received in the hydraulic-pressure generation chamber so that the piston is movable in the upper-lower direction and projects upward from the hydraulic-pressure generation chamber;
• the piston receives a downward pressing force from the slider in a course of movement of the slider from the upper position to the lower position;
• the slider, the punch, and the piston are configured such that, when the slider is moved from the upper position toward the lower position under a state where the hydraulic chamber is filled with the liquid and the workpiece is placed on the workpiece processing chamber, the punch is moved downward and presses the workpiece into the workpiece processing chamber, and the piston is moved downward in accordance with the pressing force and increases hydraulic pressure of the liquid;
• the hydraulic chamber is provided with a relief valve;
• and
• the relief valve controls the hydraulic pressure so that the hydraulic pressure does not exceed a predetermined value.