Punch hydraulic system

Punch hydraulic system

  When the slider of the punch moves the stamped part down, the slider will be affected by the slider. To the reaction force of the stamping, the reaction force is a momentary force, which will cause a large impulse to the machine frame, which is not conducive to the stability of the bed frame. To this end, this paper designs a hydraulic system as a flexible buffer mechanism to avoid the reaction force generated during stamping directly acting on the upper bed due to the rigid connection. The cylinder block is fixed on the punching plate (Fig. 2), and the push rod and the upper bed are fixed. When the punching machine is working, the guiding screw provides upward force to the upper bed, the cylinder provides downward force to the upper body, and the cylinder acts to balance the pressure during the downward pressing of the sliding block, and the reaction is counteracted when the sliding block is punched at the bottom dead center. When the force is impacted, the cylinder acts as a buffer. When the mold is changed, the cylinder pushes the upper body to move down.

  The three types of cylinder push rod movements need to be controlled, that is, push, contract and stop, so the three-way four-way electromagnetic reversing valve corresponds to the three types of cylinders. When the left and right positions of the reversing valve are respectively connected, the oil pump respectively turns on the upper chamber and the lower chamber of the cylinder, thereby driving the cylinder push rods to move downward and upward respectively. When the middle of the reversing valve is connected, the punching work at this time, when the pressing reaction force is received, the pressure that can withstand the pressure is controlled by the upper chamber of the cylinder and the overflow valve connected thereto. The oil pump does not need to supply oil to the cylinder at this time, and the oil pump does not need to be operated. When the oil leakage needs to be replenished and the pressure is maintained, the left side of the reversing valve is turned on. At this time, the oil pump needs to be started to replenish the upper chamber of the cylinder. Therefore, the servo oil pump is used to turn the oil at any time to save energy.

The hydraulic schematic of the hydraulic system is shown in Figure 1.