Injection molding machine questions, how to debug the basic problems of injection molding machines?

The working principle of the injection molding machine is to inject the molten resin into the injection mold through high temperature and high pressure, fill the mold cavity of the injection mold (the mold cavity shape of the injection mold is the injection molded part we want), and then cool and solidify to get the injection molded part (product) we want. Injection molding is a cyclical process, each cycle mainly includes: quantitative feeding, melt plasticization, pressure injection, mold filling and cooling, mold opening and picking.

After removing the part, the mold is closed again and the next cycle is carried out. Injection molding machine operation items: Injection molding machine operation items include control keyboard operation, electrical control system operation and hydraulic system operation.

The selection of injection process action, feeding action, injection pressure, injection speed, ejection type, monitoring of the temperature of each section of the barrel, and adjustment of injection pressure are carried out respectively.

Some injection molding machines do not use thermocouples to control the temperature, they are adjusted by hand, 1 to 4 gears are the current size of the heating ring of the nozzle, generally not connected to the ammeter, if the nozzle power supply is not output by the computer, the percentage does not matter. However, computers are controlled using both manual and thermocouple methods. When used as a percentage, the heating and intermittent times can be adjusted.

According to what you described, the heating system should be controlled by voltage, that is, the rated power of the heater should be adjusted by voltage. When it is adjusted to the maximum, it is the maximum power (the maximum value of power = 1 + 2 + 3 + 4 at this time), and only when it is adjusted to the maximum 4 gears is it normal. A single gear adjustment is to adjust the current only to the total power...

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According to the failure state, the injection molding machine is divided into gradual failure and sudden failure, the gradual failure is caused by the gradual deterioration of the initial performance, and the failure of most injection molding machines belongs to this type of failure; Sudden failures are caused by the combined action of various unfavorable factors and accidental external influences, and are generally caused by defects in design, manufacturing, assembly and materials, or operation errors and illegal operations.

Failure of the injection molding machine.

The injection position of the injection molding machine does not display numbers, and all actions are not controlled by the electronic ruler.

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The injection molding machine is divided into gradual failure and sudden failure according to the failure state, the gradual failure is caused by the gradual deterioration of the initial performance, and the failure of most of the injection molding machines in the sales stool belongs to this kind of failure; Sudden failures are caused by the combined action of various unfavorable factors and accidental external influences, which are generally caused by defects in design, manufacturing, transportation and materials, or operation errors and illegal operations.

In this case, there is generally a problem with the connection between the electronic ruler and the circuit board, you can connect the electronic ruler directly to the circuit board, move the electronic ruler by hand, and see if the displayed value is normal, you can judge where the problem is. In addition, check whether the DC power supply voltage is normal, and check whether the input terminals of the electronic ruler and the circuit board are wired correctly. If there is no data, reset the clamping position to zero, and adjust the pressure speed of the last section to about 10, and the difference in the position is 10.

The power supply voltage of the special electronic vertical ruler of the injection molding machine should stabilize the stability required by the industrial power supply, such as the reference voltage of the magic key 10V, which allows some fluctuations, otherwise, it will lead to the fluctuation of the displayed trap. If the fluctuation amplitude of the display does not exceed the amplitude of the fluctuation voltage, the electronic ruler of the displacement sensor is normal.

The special electronic ruler of the injection molding machine prevents electrostatic interference, electrostatic interference and frequency modulation interference, and it is easy to make the electronic dry weight ruler display digital jump. The strong current line of the equipment is not or volts are separated from the signal line of the electronic ruler. The electronic ruler should use a forced grounding bracket, and the electronic ruler shell (the resistance between the end cover screw and the bracket can be measured, should be less than 1 resistance) is well grounded, the signal wire should be shielded wire, and the shielded wire should be grounded at one end of the electrical box.

When static electricity interferes, the voltage measurement of the general multimeter is very normal, but it shows the digital jump; The same is true for high-frequency interference. To verify whether it is electrostatic interference, use a section of power cord to short the cover screw of the electronic ruler with a certain point of metal on the machine, as long as it is shorted, the electrostatic interference will be eliminated immediately. But high-frequency interference is difficult to be eliminated by the above-mentioned method, and the manipulator, the inverter has more high-frequency interference, which can be verified by stopping the manipulator or the method of frequency conversion power saver.

Performance measurements are performed.

1. Start the injection molding machine.

After the assembly and commissioning of the parts, the injection molding machine is started, first manually (or joged), and then the no-load and load determination are carried out.

2. Adjust the load change speed from low to high, the load from small to large, and the maximum system pressure cannot exceed 140kg cm2, and the performance is measured according to the specified standard.

3. Expand the scope of performance test.

According to the need, the scope of performance test is gradually expanded from the local dismantling department to the system. Pay attention to the operating status of the muchun system in the non-fault area. If the performance meets the requirements, it will be delivered, and if the requirements are not met, the fault location will be redetermined.

There are many reasons for this, first check whether the thickness of the mold is adjusted to the appropriate monk, and whether the high-voltage position is adjusted, whether the high-voltage signal position is in contact, etc.

If the pressure of the machine system cannot reach the maximum pressure set when the machine is started, it is generally that the hydraulic oil is not working, and the pressure valve and flow valve are stuck after the shutdown.

If, at the time of start-up, the actual maximum pressure of the machine is the same as the maximum pressure set by the system, this means that the clamping high-pressure position is set incorrectly.

First, the oil pump motor and oil pump start, but no pressure.

1. The wiring of the proportional valve on the oil pump is loose or the coil is burned - check whether the proportional pressure valve is energized.

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2. Impurities block the oil port of the proportional pressure valve on the oil pump - remove the proportional pressure valve to remove impurities.

3. The pressure oil is unclean, and debris accumulates on the surface of the oil filter, which prevents the pressure oil from entering the pump - clean the oil filter and replace the pressure.

4. Oil leakage inside the oil pump, due to damage caused by too long use, internal wear and tear or unclean pressure oil - repair or replace the oil pump.

5. Oil leakage from oil pumps, oil pipes and joints - eliminate leakage places.

6. The oil is stuck - check whether the oil valve core is active normally.

Second, the temperature of the melt cartridge cannot be controlled.

1. The temperature cannot be controlled, check whether the contacts of the electric thermal contactor are sticky, and whether the wires of the thermocouple are loose or damaged.

2. If the temperature cannot rise, check whether the electric heating air switch in the electric box is adjusted, whether the contactor and relay are engaged, whether there is voltage, whether the fuse is burned out, and whether the heating ring is burned out.

3. Whether the temperature gauge is damaged.

Third, no clamping.

1. Whether the front opening safety door has been closed, whether the limiter of the safety door has been crimped and loosened for the safety door, and whether the wiring is loose or damaged.

2. The coil of the clamping electromagnetic system may have moved to the valve and stuck with the valve core - clean or replace the clamping control valve.

3. The directional valve may not be reset - clean the directional valve.

4. The thimble cannot be withdrawn back into place - check whether the thimble action is normal.

5. Check whether the origin of the computer controller's mold locking and mold opening electronic ruler has been changed, and whether the mold locking position has been terminated.

6. Check whether the pressure gauge is moving.

7. Press the mode-locking button to see if the display screen displays the mode-locking signal or other signals and alarms.

8. Check whether the position, speed and pressure of the clamping are adjusted normally.

9. Check whether the piston rod of the clamping is broken.

Fourth, do not shoot glue.

1. The coil of the injection electromagnetic system may have been burned, or there may be foreign objects entering the direction valve, and the valve core is stuck and moving-clean or replace the injection valve.

2. The pressure is too low - turn up the injection pressure.

3. The temperature of the injection molding is too low - adjust the temperature gauge to raise the temperature to the required point, if the temperature gauge is still not able to raise the temperature, check whether the heating torch and fuse are burned or loose, if it has been broken, replace it in time.

4. The wiring of the injection combination valve opening system is loose or the contact is poor - connect the wire head of the combination switch properly.

Fifth, the sol screw rotates, but the rubber does not enter the barrel.

1. The sol retreat pressure is too high, and the back pressure valve is damaged or improperly adjusted - adjust or replace the sol back pressure valve. 2. The water transportation is insufficient, so that the temperature is too high, so that the rubber particles are blocked when entering the screw - adjust the water transportation volume and take out the bonded glue block. See if the water flow circle is clogged or the water is not cooled.

3. There is no material in the bucket - feeding.

4. Whether the temperature of the melt cartridge is too high.

Sixth, the shooting table does not move.

1. The moving limit travel switch of the shooting table is adjusted and pressed by the collision block - adjusted.

2. The coil of the mobile solenoid valve of the injection table may have been burned or there are foreign objects.

(1): No clamping:

Solution: 1): Check the travel switch in front of the safety door and fix it.

2): Check the 24V5A power supply in the electrical box, replace the fuse and power box.

3): Check whether the spool is stuck and clean the spool.

4): Check whether the IO board has output and whether the solenoid valve is live.

5): Check whether the hydraulic safety switch is pressed and whether the mechanical lock rod baffle is opened.

2): Mold opening and closing machine ringing:

Solution: 1): Check whether the lubricating oil pipe is disconnected, if so, the oil pipe must be reconnected.

2): The amount of lubricating oil is small, increase the amount of lubricating oil, it is recommended to make 50 molds of oil once or manually add enough lubricating oil.

3): The clamping force is large, check whether the mold needs a large clamping force, and adjust the clamping force.

4): The current of the amplifier plate is disturbed, check whether the current parameters meet the acceptance criteria, and readjust the current value.

5): The parallelism is out of tolerance, and the parallelism of the first two plates is checked with a dial gauge whether it is greater than the acceptance standard; Modulation parallelism.

Three): Wait a few seconds before opening the mold:

Solution: 1): If the starting speed is slow, check whether the screw damping is too large, and adjust the screw damping hole.

2): The middle hole of the damping screw is too large, check whether the damping of the Y-hole screw is too large, and replace the damping nail with a thin center hole.

4): Unlocking and crawling:

Treatment method: 1): The two-plate guide rail and the corinning column are worn out, check the two-plate guide rail and the corin column, replace the two-plate copper sleeve and the corin column, and fill the lubricating oil.

2): improper adjustment of the clamping speed and pressure, set the flow rate 20, the pressure is 99, the second plate of the clamping mold should not crawl, adjust the flow proportional valve hole, or the pilot valve hole, adjust the linear current value of the proportional valve.

Five): the mold is not open:

Treatment method: 1): Increase the clamping speed, the pressure flow is too small and not adjusted, check the unlocking speed, whether the pressure is appropriate, and increase the unlocking pressure and speed.

2): The zero position of the clamping electronic ruler is changed, check whether the clamping and straightening machine is terminated in the zero position after twisting, and readjust the zero position of the electronic ruler.

3): Check whether it is reversed.

1. Unstable or unqualified product production In a stable production cycle, the unstable quality of finished products may be caused by wear and tear of mechanical parts or improper adjustment. 1. Wear of screws, check rings and barrels. 2. The sealing ring in the injection cylinder is damaged and causes internal leakage.

3. The temperature control of the heating cylinder is unstable. 4. The pressure and speed control part is abnormal. Two.

Dear, according to your description, the injection molding machine suddenly has no pressure, there may be the following reasons:1Oil pump failure:

Injection molding machines need pressure to drive the hydraulic system when they work. If the oil pump fails, such as insufficient flow, unstable pressure, etc., it will cause the injection molding machine to have no pressure. At this time, it is necessary to check whether the oil pipe and oil filter around the oil pump and its surroundings are normal, and whether the quality of the hydraulic oil meets the requirements.

2.Cylinder failure: The cylinder is an important component to achieve pressure transmission in the injection molding machine.

If the cylinder is damaged or jammed, it will cause the injection molding machine to run out of pressure. It is necessary to check whether the piston and seal of the cylinder are normal, and whether the lubrication of the oil bridge cylinder is sufficient. 3.

Electrical failure: If the electrical system of the injection molding machine fails, such as power failure, circuit board damage, etc., it will cause the injection molding machine to have no pressure. It is necessary to check whether the electrical system is normal and troubleshoot.

4.Pressure gauge failure: Manometer is an important tool for injection molding machines to monitor pressure.

If the manometer is faulty or damaged, the injection molding machine will be left without pressure. It is necessary to check whether the connection of the pressure gauge is normal, whether the pressure gauge is damaged, and whether the other pressure sensors are normal. In short, the injection molding machine suddenly has no pressure, and it is necessary to eliminate the fault cover in time to ensure its normal operation.

It is advisable to find a professional for inspection and repair.

Summary. If the injection molding machine product is not satisfied, the following adjustments can be made:1

Inspect the mold: Confirm that the mold is placed correctly and is in good condition. 2.

Adjust the injection speed: Appropriately increase the injection speed and increase the entry speed of the plastic, which helps to fill the void in the mold. 3.

Adjust the injection pressure: Increasing the injection pressure appropriately can ensure that the plastic is evenly filled in the mold. 4.

Check the melting temperature of the plastic: make sure that the temperature of the melt is appropriate and that the heating device of the machine is working properly. 5.

Check the hopper: Make sure that there is enough plastic in the plastic hopper and that there are no obstructions that affect its normal use. Please note that the injection molding machine should be stopped and safe before any adjustments are made.

If the injection molding machine product is not satisfied, the following adjustments can be made:1Check the mold:

Confirm that the mold is scrambled and that it is correctly placed and in good condition. 2.Adjust the injection speed:

Appropriately increase the injection speed and increase the entry speed of the plastic, which helps to fill the voids in the mold. 3.Adjust the jet pressure:

Increasing the injection pressure appropriately can ensure that the plastic is evenly filled in the mold. 4.Check the melting temperature of the plastic:

Make sure that the temperature of the melt is appropriate and that the heating device of the machine is working properly. Book 5Check the hopper:

Make sure that there is enough plastic in the plastic hopper and that there are no obstructions that affect its normal use. Please note that the injection molding machine should be stopped and safe before any adjustments are made. In addition, if you are not sure how to adjust the machine accurately, please refer to the operating manual or contact a professional technician for assistance.

When injection molding, the first few molds of products are good, and occasionally there is a lack of materials in one mold, or no products at all.

The first few molds of products are good, occasionally there is a lack of materials, or no products at all, which may be caused by the following reasons: 1Mold Issues:

It may be that the mold structure design is unreasonable, resulting in problems such as difficult product release or lack of materials in injection molding. At this time, you can check whether the mold opening force is normal, whether the gap between the molds is appropriate, whether the floating parts are sealed, etc. 2.

Injection molding machine parameter setting problem: The parameters of the injection molding machine include injection speed, pressure holding time and pressure holding time, etc., which may be improperly set, resulting in the plastic cannot be filled or flows too fast, resulting in a shortage of materials or products. To solve this problem, it is recommended to re-set the parameters of the injection molding machine to improve the flow and filling properties of the plastic.

3.Raw material problems: During the injection molding process, there may be problems such as differences in the size of raw material particles, different humidity, or mixed raw materials with foreign bodies, resulting in poor flow or blockage of plastics.

At this time, you can check whether the raw materials meet the requirements, and if you need to replace the raw materials, you need to select the ratio according to the requirements of the injection molding process. 4.Operational Issues:

In the injection molding process, the operator may not operate in accordance with the process requirements or operate negligently, such as forgetting to feed. It is recommended that the operator operate in strict accordance with the process requirements in the production process to ensure product quality. According to the specific situation, the problem can be targeted and solved in time.