Failure Analysis and Repair of Injection Molding Machine

1. Semi-automatic state, still in high pressure mode locking state after mold locking in place
1. There is no mode locking termination signal feedback or the high voltage time is too long
2. The locking end limit switch is broken
3. The locking end switch wire is broken
4. Computer I/O check
2. After mold locking, during the injection process, the crankshaft retracted a little, resulting in the induction of the mold locking end switch not working, resulting in the injection action cannot continue
1 Check whether there is any problem with the locking cylinder and its oil seal
2 The crank is worn,
3 Adjust the die thickness origin
4 Reset the position of three locking plates (connecting rod, shaft sleeve)
5. The piston rod is lengthened. The old machine has such problems
6 Check whether the low pressure is too high and whether the low pressure position is too small
7 There is a gap between the piston rod and the cross of the mold locking cylinder, and a washer is added
3. The output signal light of the computer for mold closing is on, and there is a buzzing noise. It is mold failure
1 Check whether there is a problem with the solenoid valve of mold locking
2 Whether the stripping signal is normal
3 Check whether the actual opening position has exceeded the set value
4. Whether the differential locking valve is stuck
5 Check whether the final stroke switch of mold closing is in good condition
6 Whether the hydraulic mechanical safety valve is pressed and whether the safety valve is faulty
7 Check whether there is flow output (cpu output, proportional flow current
8. Check whether the piston of the mould locking cylinder is loose. Check the oil seal or check the mould closing oil inlet
9. Inspection of clamping mechanism Does the hand get stuck
10 Check the circuit optical ruler.
11 Press the lock key to check whether the display of pressure and speedometer is consistent with the set parameters
12 The front and rear switches of ejector pin are on at the same time
13 Reverse the opening and closing oil pipe and then install it
14 Whether the mechanical safety block is still in the lower gear and whether the safety screw is adjusted in place
15 Neutron inspection
4. The machine does not close the mold. The pressure is available. The signal is also output. The solenoid valve is also good. But it does not close the mold!
1 Is there a signal on the solenoid valve? (PC output,) mold closing solenoid valve check
2 Check whether the safety valve is stuck
3 Check whether the flow proportional valve is normal
4. Check whether there is an alarm display to reset the closing touch to zero. Is there a problem when resetting the closing position? What actions are displayed on the page?
5. Check the locking end row switch (electronic ruler position check)
6 Piston cylinder inspection
5. The locking film is not tight, and the flash always comes out
1. Check the pressure of small pump
2. Whether both high-pressure mold closing pumps work
3. Check the wear of the clamping mechanism. Check the fit of the elbow and the large pin shaft
4. Check whether the fixing bolts are loose
5. Calculate whether the clamping force is correct, and the mold product does not match
6. The injection pressure setting is too small
7. Inspection for mould closing piston oil seal
6. The mold cannot be closed manually or semi-automatically. If the flow valve is replaced, it will not work after half an hour of production
1. When the mold cannot be closed, are other actions normal (The shooter moves forward and backward.)
2 Check the proportional pressure flow valve to see if there is pressure display when the fault occurs
3 Inspection of mould closing oil seal
4. Check the jacking function Inspection of jacking oil cylinder
5 Neutron inspection
6 Oil temperature inspection
7. The clamping force often drops during production, and the mold needs to be adjusted again
1. The pulling force of Coring column is unbalanced or the mechanical hinge is worn, adjust the pulling force of Coring column or repair the mechanical hinge
2. The mold opening valve and the mold adjusting valve have internal leakage. Is it the phenomenon that the middle note adjusting nut rotates during mold opening and locking
3 Check whether there are any problems with all parts of the hinge
4 Computer output check whether there is mode modulation signal output
8. After the Haitian 180T machine was installed with a relatively large mold for production (note: this mold was also produced on this machine before, and there was no problem), it is now found that the high-pressure mold locking has been locked during semi-automatic production. After the mold closing end travel switch is pressed, the twist will loosen until the mold closing end travel switch is not pressed at the injection time, and it still continues to operate, resulting in batch cutting of the products
1. When the oil seal is not damaged, the closing delay shall be increased or the stop switch shall be adjusted again
2. Check whether the mold closing, mold adjustment and valve internal leakage have been checked, and check whether the piston oil seal of the mold locking cylinder has rotted
3 Is there any clearance in the clamping frame?
4 Check whether the lower mold valve is loose and whether the mold adjusting pin falls off
5 Adjust the travel switch to make the mold locking cross move forward a bit. The glue injection will not return
6. What is the high voltage of mode locking? What is the pressure of glue injection? Mold locking origin inspection
9. What is the reason for the sudden high voltage mold locking alarm during production?
1. Check whether the electronic ruler has been locked to zero. This phenomenon is often caused by the loose fastening screw of the electronic ruler or the broken electronic ruler
2. The proportional amplifier board IC is broken