How to repair the injection molding machine

    Introduction: 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. It is divided into vertical type, horizontal type and all electric type. The injection molding machine heats the plastic and applies high pressure to the molten plastic to make it shoot out and fill the mold cavity.

    After the injection molding machine motor is started, the pressure gauge has pressure

    Treatment method:

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

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

    After the injection molding machine is started up for production for a period of time, the oil pump makes a loud noise and troubleshooting

    Treatment method:

    (1) : poor quality of oil suction pipe. Remove the filter screen and check whether it is deformed. Whether the oil suction pipe is layered. Replace the oil pipe and filter screen.

    (2) : the filter screen is not clean. Whether there are too many impurities in the hydraulic oil. Clean the filter screen.

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

    Treatment of creeping failure of injection molding machine

    Causes:

    (1) : poor lubrication conditions. The "pause slide pause" appears. Increase the amount of lubrication.

    (2) : immerse the system in air. Exhaust is required.

    (3) : mechanical rigidity reason. Parts are worn and deformed, causing friction changes and crawling. Replace parts.

    Cause analysis of hydraulic oil pollution in injection molding machine

    Oil pollution:

    (1) : air is mixed in the oil. The main banquet is not well sealed due to pipe joints, hydraulic pumps and hydraulic cylinders. It shows that there are bubbles on the oil tank.

    (2) : water is mixed in the oil. Will turn the oil milky white. The main reason is that the cooler leaks.

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

    (4) : colloidal substances are produced in oil. The main reason is that the seal is eroded or deteriorated by the oil, resulting in colloidal substances in the oil, which often block the small holes.

    Troubleshooting of high noise during mold opening of injection molding machine

    Treatment method:

    (1) : poor proportional linearity, poor adjustment of opening and closing time and position, check the oblique rise and fall of the amplification plate, adjust the oblique rise and fall of the amplification plate, and adjust the time appropriately.

    (2) : the lubrication of die locking machine hinge is poor. Check the lubrication of coring column, second plate sliding foot and machine hinge, and increase the lubrication.

    (3) : the mold locking force is too large. Check the mold locking force when the mold is stressed, and reduce the mold locking force according to the user's product.

    (4) : check the parallelism of the head plate and the second plate. Adjust the parallel error of the second plate and the head plate.

    (5) : slow to fast mold opening position is too small and speed is 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. Lengthen the slow mold opening position and reduce the slow mold opening speed.

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

    Treatment method:

    (1) : the ejector pin board is broken. Check whether the circuit is normal. The normal voltage is dv24v. Repair the ejector pin plate.

    (2) : if the line is broken, comprehensively check the switch connecting line and the connecting line on the I / O board. Check the wiring and reconnect it

    Trouble shooting of injection molding machine without thimble action

    Treatment method:

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

    (2) : jam the valve, press the ejector pin with a hexagonal key to check whether the valve core is movable, and clean the pressure valve

    (3) : the thimble limit rod is broken. Take out the limit rod manually after shutdown and replace the limit rod.

    (4) : the thimble switch is short circuited. Check the ground 0 voltage of the thimble switch with a multimeter and replace the thimble switch.

    Manual mold opening termination, semi-automatic no mold opening termination fault handling

    Treatment method:

    (1) : the mold opening valve leaks. After manually striking the shooting table, observe that the second plate retreats quickly, and replace the mold opening valve.

    (2) : the ramp up and down of the amplification plate is not adjusted properly. Check the amplification slope for a long time, and readjust the ramp time of the amplification plate.

    The injection molding machine can not afford high pressure and exceeds the stroke fault treatment

    Treatment method:

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

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

    Troubleshooting of poor mold locking of injection molding machine

    Treatment method:

    (1) : improper adjustment of holes a and B. when setting the system flow of 20 and pressure of 99, observe whether the clamping action crawls and readjust.

    (2) : there is air in the oil circuit. Listen to whether there is air sound in the oil circuit and exhaust it.

    (3) : the ramp up and ramp down of the amplification plate is not adjusted properly. Observe whether the current value of the ammeter is consistent with the lifting change speed, and adjust the amplification plate.

    Failure treatment of only mold opening action during mold locking of injection molding machine

    Treatment method:

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

    (2) : if the valve is stuck or the valve core is installed incorrectly, check whether the valve core is installed incorrectly or blocked, reinstall the valve core or clean it.

    Troubleshooting of slow mold opening in fully automatic injection molding machine

    Treatment method:

    (1) : if the oil plate leaks, check or replace the express mold locking valve and replace the oil plate.

    (2) : if the mold opening valve leaks, start the oil pump to stop mold locking, act according to the injection table or glue injection, check whether the second plate moves backward, and replace the mold opening oil valve.

    The automatic mold adjustment of injection molding machine is getting tighter or looser

    Treatment method:

    (1) : the mode regulating solenoid valve has internal leakage. Check whether the solenoid valve is of "O" type, model 4we6e or 0810092101. Replace the solenoid valve.

    Crawling treatment of unlocking die of injection molding machine

    Treatment method:

    (1) : the second board guide rail and coring column are greatly worn. Check the second board guide rail and coring column, replace the second board copper sleeve and coring column, and add lubricating oil.

    (2) : the speed and pressure of mold unlocking are not adjusted properly. When the flow is set at 20 and the pressure is 99, the second mold locking plate shall not crawl. Adjust the flow proportional valve hole or pilot valve hole, and adjust the linear current value of proportional valve.

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

    Mold opening and closing machine of injection molding machine

    Treatment method:

    (1) : check whether the lubricating oil pipe is broken, otherwise there is no lubricating oil to the winch, and reconnect the oil pipe.

    (2) : the amount of lubricating oil is small. Increase the amount of lubricating oil. It is recommended to lubricate 50 dies once.

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

    (4) : adjust the current disorderly, check whether the current parameters meet the acceptance standards, and readjust 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 parallelism.

    Countermeasures for non mold locking of injection molding machine

    Treatment method:

    (1) : check the travel switch in front of the safety door. And fix it.

    (2) : check the 24v5a power supply, replace the fuse 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.

    Fault problems and treatment methods of mold adjusting part of injection molding machine

    Treatment method:

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

    (2) : the clearance between the pressing plate and the die adjusting screw is too small. Measure with feeler gauge. Adjust the clearance between pressing plate and nut, and the clearance between mold adjusting nut and pressing plate (clearance ≤ 0.05mm).

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

    (4) : upper and lower support plate adjustment. Disassemble the locking nut of the support plate for inspection. Adjust the upper and lower support plates.

    (5) : the I / O board is broken. Check whether there is a signal at the output point on the computer page. Repair the electronic board.

    (6) : the mold adjusting valve element is stuck. Remove the valve for inspection. Clean the valve.

    (7) : the mode adjusting motor is broken: check the oil motor. Replace or repair the oil motor.

    Solution of reducing coring column fracture by injection molding machine

    1. In the design, it is necessary to avoid the sharp change of shaft diameter, use large fillet transition as far as possible at the step or tool withdrawal groove, and select materials with good comprehensive performance. The special treatment should not only solve the hardness of thread surface (wear resistance), but also try to reduce the surface stress concentration, improve the surface finish and minimize stress damage.

    2. Ensure the working accuracy, especially the length of connecting rod, the height of bearing seat, the accuracy of crosshead, the positioning accuracy of bearing seat in formwork, etc.

    3. Special attention shall be paid to ensure that the length of the four support rods is good during assembly or after removing the mold adjusting nut, and the spacing between the mold adjusting nut and the rear formwork shall also be adjusted.

    4. When the product has flash, analyze the causes, and do not unilaterally improve the clamping force. If the mold is found to be uneven, it shall be polished. If the connecting rod length is uneven, it shall be corrected, including copper pad, paper, etc. Or correct the mold adjusting nut.

    The above solutions can only play a certain role and may not be solved from the root. Moreover, some measures will increase the manufacturing cost, such as increasing the diameter of pull rod, using good materials, etc., so it depends on the choice of manufacturers to some extent. For the use of full hydraulic clamping structure, it is a better choice to solve the problem of broken pull rod. However, because the traditional hydraulic type still has the problems of slow speed and high energy consumption, after weighing, the small and medium-sized machines are still dominated by elbow bar type, which can not be fundamentally solved until the emergence of two plate type.