What should I do if the hydraulic locking pressure of the injection molding machine fails?

1、 The locking pressure cannot be reached
The mold locking pressure input on the display screen is 200, while the mold locking pressure gauge actually shows only 150 bar, and the pressure is normal.
1. In the molding machine without a mold locking pressure relay or pressure sensor, the mold locking in place is controlled by the mold locking time. First, lengthen the mold locking time on the display screen and observe whether the pressure gauge shows an increase.
2. Check whether the maximum pressure of the system can be set to 200bar. Pressure commissioning can be carried out in the system pressure and flow commissioning page of the display screen. If it can not be set, check the pump source and other reasons.
2、 The locking pressure cannot be maintained
1. The pressure drop of the clamping pressure is generally caused by the internal leakage of the valve. Taking CHG128 as an example, the internal leakage of the hydraulic control check valve V15 and the superimposed hydraulic control check valve V33 on the clamping valve plate has an impact on the clamping pressure. However, due to the small internal leakage of the two valves, the pressure drop of the locking pressure is relatively slow, and most of them are due to dirt jamming. The two valves can be disassembled and cleaned one by one.
2. The sealing performance of the four internal circulation piston components, including the sealing at the fitting of the valve core and the sealing of the seals on the piston, is characterized by the rapid drop of the locking pressure in case of leakage. Disassembly and assembly here is very troublesome. Generally, it is the last treatment.
3. In the old machine, the locking cylinder realizes external circulation through the cartridge valve, which is normally open. During the pressure maintaining action, the cartridge valve should be closed under the action of the control oil. At this time, the leakage of the control oil will also make the cartridge valve open, resulting in pressure drop. The control oil is maintained by the superimposed hydraulic control check valve V12. The internal leakage and closing speed of V12 will affect the pressure maintenance. It shows that the mold locking pressure drops 10-30 bar in a short time, and then remains unchanged. At this time, replace the return spring of V12 to make it close quickly.
The pressure drop failure of the mold locking cylinder should be analyzed from the above points, from simple to difficult, and eliminated one by one.