Common failure problems and solutions of injection molding machine maintenance?

Injection molding machine also known as injection molding machine or injection machine. It is the main molding equipment for making thermoplastic or thermosetting plastics into plastic products of various shapes using plastic molding molds. Divided into vertical, horizontal, all-electric. The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it shoot out and fill the mold cavity.

After the injection molding machine motor starts, the pressure gauge has pressure

Processing method:

(1): the amplifier board is broken. Use a multimeter to measure whether current passes through, and repair the amplifier board.

(2): The overflow valve is stuck. Remove the relief valve for inspection and clean the relief valve.

After the injection molding machine is started to produce for a period of time, the oil pump makes a loud noise.

Processing method:

(1): the suction pipe quality is not good. Remove the filter screen to check whether it is deformed. Whether the suction pipe is delaminated. Replace the tubing and strainer.

(2): filter is not clean. Whether the impurities in the hydraulic oil are too much. Clean the strainer.

(3): oil pump wear: check the oil pump oil distribution plate and rotor end face. Replace the oil pump.

Injection molding machine crawling fault processing

Causes:

(1): poor lubrication conditions. "Pause-Glide-Pause" appears ". Increase the amount of lubrication.

(2): The system is immersed in air. Exhaust required.

(3): mechanical rigidity reasons. Parts wear and deformation, causing friction changes and crawling. Replace parts.

Cause Analysis of Hydraulic Oil Pollution in Injection Molding Machine

Oil pollution:

(1): oil mixed with air. The main banquet due to pipe joints, hydraulic pumps, hydraulic cylinders and other tight is not good. There are bubbles on the fuel tank.

(2): oil mixed with water. It turns the oil into Milky White. The main banquet causes the cooler to leak.

(3): oil mixed with solid impurities. Mainly chips, welding slag, rust flakes and metal powder.

(4): The oil produces a gelatinous substance. The main banquet is that the seal is eroded by the oil or the oil deteriorates, causing the oil to produce a gelatinous substance, which often clogs the small holes.

Troubleshooting of loud sound during mold opening of injection molding machine

Processing method:

(1): The proportional linearity is poor, the opening and closing time and position are not well adjusted, check the oblique rise and fall of the magnifying plate, adjust the oblique rise and fall of the magnifying plate, and adjust the time appropriately.

(2): The hinge of the mold locking machine is not well lubricated. Check the lubrication of the Corinth column, the second plate sliding foot and the hinge, and increase the lubrication.

(3): The mold clamping force is too large, check the mold clamping force when the mold is stressed, and reduce the clamping force according to the user's product situation.

(4): head two plate parallelism deviation, check the head two plate parallelism. Adjust the two plates, head plate parallel error.

(5): slow to fast open mold position is too small, too fast. Check whether the position of slow mold opening to fast mold opening is appropriate and whether the slow mold opening speed is too fast. Lender the slow mold opening position and reduce the slow mold opening speed.

Troubleshooting of thimble out of control in semi-automatic injection molding machine

Processing method:

(1): The thimble board is broken, check whether the line is normal and the normal voltage DV24V. Repair the thimble plate.

(2): The line is broken, check the switch connection line and the I/O board connection line. Check the wiring and rewire.

Injection molding machine without thimble action fault treatment

Processing method:

(1): The thimble limit switch is broken, check the DC24V line with a multimeter. Replace the thimble limit switch.

(2): Card the valve, use a hexagonal key to press whether the thimble valve core can be moved, and clean the pressure valve

(3): The thimble limit rod is broken. After stopping the machine, take out the limit rod by hand and replace the limit rod.

(4): The thimble switch is short-circuited, use a multimeter to check the zero voltage of the thimble switch to ground, and replace the thimble switch.

Manual with mold opening termination, semi-automatic without mold opening termination fault treatment

Processing method:

(1): The mold opening valve leaks. After manual shooting, observe that the second plate moves back quickly and replace the mold opening valve.

(2): Improper adjustment of the ramp up and ramp down of the amplifier board, check that the amplification slope time is long, and readjust the ramp time of the amplifier board.

Failure Treatment of Injection Molding Machine Failure to Lock High Pressure and Exceeding Stroke

Processing method:

(1): The limit switch exceeds the limit, check whether the mold adjustment is appropriate, and adjust the appropriate mold thickness.

(2): The hydraulic limit exceeds the stroke, check whether the mold adjustment is appropriate, and adjust the mold forward appropriately.

Failure Treatment of Injection Molding Machine with Poor Clamping

Processing method:

(1): Improper adjustment of holes A and B, when setting the system flow rate 20 and pressure 99, observe whether the clamping action is crawling and readjust.

(2): There is air in the oil circuit, listen to whether there is air sound in the oil circuit, and exhaust is required.

(3): The amplifier board is improperly adjusted for ramp-up and ramp-down. Observe whether the current value of the ammeter is consistent with the speed of change, and adjust the amplifier board.

Injection molding machine clamping only open mold action failure treatment

Processing method:

(1): connect the wrong line, check whether there is 24VDC to the valve, check the line and wiring.

(2): card valve or the wrong spool, check whether the spool is installed wrong, or blocked, reinstall the spool or cleaning.

Injection molding machine automatic slowly open mold fault processing

Processing method:

(1): The oil-made plate leaks, check or replace the express clamping valve, and replace the oil-made plate.

(2): The mold opening valve leaks, start the oil pump to terminate the mold locking, press the shooting table or glue injection action, whether the second plate moves backward, and replace the mold opening oil valve.

Injection molding machine automatic mold more and more tight or loose

Processing method:

(1): adjust the mold solenoid valve leakage, check whether the solenoid valve is "O" type, model 4WE6E or 0810092101, replace the solenoid valve.

Crawling Treatment of Unlocking Mold for Injection Molding Machine

Processing method:

(1): The two-plate guide rail and Corinth pillar are worn out. Check the two-plate guide rail and Corinth pillar, replace the two-plate copper sleeve and Corinth pillar, and add lubricating oil.

(2): Improper adjustment of the speed and pressure of the unlocking mode. When the flow rate is set at 20 and the pressure at 99, the locking mode two plates should not crawl. Adjust the flow proportional valve hole or pilot valve hole and adjust the linear current value of the proportional valve.

(3): There is air in the pipeline and cylinder, exhaust.

Injection molding machine opening and closing machine twist

Processing method:

(1): Check whether the lubricating oil pipe is broken, otherwise no lubricating oil will reach the machine, and reconnect the oil pipe.

(2): the amount of lubricating oil is small, increase the amount of lubricating oil, it is recommended to pump oil once in 50 models.

(3): The clamping force is large, check whether the mold needs large locking force, and reduce the clamping force.

(4): current adjustment, check whether the current parameters meet the acceptance criteria, re-adjust the current value.

(5): If the parallelism is out of tolerance, use a dial indicator to check whether the parallelism of the first and second plates is greater than the acceptance standard; adjust the parallelism.

Injection molding machine does not lock mold treatment countermeasures

Processing method:

(1): check the safety front travel switch. And repair.

(2): Check the 24V5A power supply, replace the insurance and power box.

(3): Check whether the valve core is stuck and clean the valve core.

(4): Check whether the I/O board has output and whether the solenoid valve is charged.

(5): Check whether the hydraulic safety switch is pressed.

Failure Problems and Treatment Methods of Injection Molding Machine Mold Adjustment Part

Processing method:

(1): mechanical level and parallelism out of tolerance. Check with a level ruler. Adjust parallelism and level.

(2): The gap between the pressure plate and the mold adjustment wire is too small. Measure with a feeler gauge. Adjust the clearance between the pressure plate and the nut, and adjust the clearance between the mold nut and the pressure plate (clearance ≤ 0.05mm).

(3): Burn the nut: check whether the nut can rotate. Replace the nut.

(4): Adjust the upper and lower support plates. Disassemble the strut lock nut for inspection. Adjust the upper and lower support plates.

(5):I/O board bad. Check the output point for a signal on the PC page. Repair the electronic board.

(6): The mold adjusting valve core is stuck. Remove the valve for inspection. Purge valve.

(7): bad mold motor: check the oil motor. Replace or repair the oil motor.