be as short as possible.
However, in order to avoid the unloading impact in the whole system, it is required to extend the discharge time as far as possible.
In short, the pressure relief curve should be as smooth as possible, not too steep.
The optimization of the whole process is realized by the proportional directional valve.
(5) Master cylinder return
The pump flow and the hydraulic cylinder have the pressure area of the bar cavity, which determines the maximum return speed. In most cases, close to the fastest speed.
The return also requires the synchronous operation, starting with the pressure reduction of the bar cavity to the end of the upper dead center.
At the instant of the return, it is required to reset the pressure of the No.8 YV2 electromagnet for 2 seconds.
Then No.11 YV3, No.24 YV6 electromagnet start work, slide block return and return speed remains constant.
(6) Pressure adjustment of press brake
No. 6 high-pressure overflow valve and No. 11 electromagnetic overflow valve are mainly for maintaining the rated power of the press brake.
No. 14 overflow valve regulates the return force of the machine so as not to damage the machine due to overload.
The work pressure in the hydraulic system can be read from the pressure gauge No.7.
The nitrogen pressure of the No.10 accumulator mainly controls the pressure required to operate the valve No. 19 /21.