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First, why the same kind of plastic, the same type of machine, the same molding conditions, the injection of glue is sometimes stable, sometimes unstable, is the problem of the machine?
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Ten major failures of injection molding machine injection
The top ten failures of injection molding machine injection are as follows:
1. Pay attention to the pressure curve and see if the pressure is stable;
2. The process parameter setting value is in a critical state (poor plasticization);
3. Proportion, output difference;
4. Check the screw and the rubber ring, whether there is any foreign matter in the nozzle;
5. Actual electric heating. Oil temperature difference;
6. The machine wears differently between the machine and the machine;
7. The difference between the operating frequency of the operator and the operator;
8. Oil pump pressure, oil seal inspection.
Second, the noise is very high when the glue is shot. After cleaning the back of the screw and applying oil, it can be good for two days but it will appear again.
1. Want to hear what is the sound? Is the oil too dirty?
2. It may be caused by the different axis of the injection screw and the barrel, and the injection piston rod is deformed!
3. The left and right sides of the oil motor seat are shaking.
Third, the machine is not enough pressure
1. Whether the oil filter net is blocked, the pump does not absorb oil;
2. The injection cylinder oil seal is broken;
3. Check system pressure, small pump pressure;
4. Proportional pressure, proportional flow output check.
Fourth, the machine leaked glue for about half a month, the problem repeated, ask how to deal with it?
1. If this is the case for each pair of molds, then the shot is not calibrated;
2. It is the place where the nozzle and the mold joint surface leak;
3. When the product is processed urgently, a piece of paper (general carton paper) can be used between the nozzle and the mold feeding port;
4. Mold sprue sleeve to see if there is any wear and tear. It is best to process the round corner of the nozzle to match the mold;
5. Mostly because the shot is moved, the nozzle and the nozzle are not aligned or the mold is not loaded with the positive mold or the positioning ring is not used to cause leakage.
6. Does the nozzle and the tool face R angle match, the nozzle mouth check;
7. Inject or hold pressure, when the storage material is switched back, the seat back and back;
8. From the new setting, the injection start time;
9. From the new back pressure parameters, check the back pressure system;
10. If the nozzle is broken, replace it directly;
11. Check if the shooting screw and the cylinder are loose.
12. Look at the action of the shooting stage when the injection is in progress. There should be no malfunction of the circuit;
13. If the routine inspection is finished or not, then it is necessary to see if the cylinder rod is long, that is, the cylinder piston has reached the end, and the cylinder traction force is not working;
14. See if the fixed template of the machine is parallel when clamping the mold; whether the Colin column of the machine is broken;
15. Is the temperature too high and the nozzle is not tightened.
5. If the injection speed is adjusted to less than 10%, there is no action. What is the reason?
1. There is a problem with the computer settings, internal adjustment. Proportional flow underflow value;
2. Flow proportional valve check;
3. Pressure and flow settings should be matched.
Six, 500 tons of machine injection set pressure and pressure gauge display pressure is not the same, (computer set pressure is 38 - pressure gauge display is 90) What is the reason for this?
1. Has the system pressure test been over? The proportional valve may have a problem, and the computer pressure proportional output is reset.
2. Proportional valves may have problems;
3. If there is a problem with the pressure gauge, please confirm;
4 circuit board weight integration block failure.
7. There is no pressure in the injection, the system pressure is normal. The screw is pumped back with pressure. Other actions are normal. Is it possible to determine whether the electromagnetic reversing valve may have problems?
1. Whether the injection glue has a set pressure speed;
2. Whether the time and location are set correctly;
3. Check the injection reversing valve and oil seal;
4. Does the solenoid valve have a signal;
5. Shooting table, injection cylinder oil seal inspection;
6. I / O check whether there is signal input and output, (see computer output screen) the amount of voltage;
7. Screw three-piece inspection.
Eight, the machine is under pressure, and it is kept once
1. If the pressure is set to three sections, after the second section is kept, go to the first paragraph, the second paragraph. The third paragraph. It should be like this! The solution is to reduce the clamping pressure and speed. Point, (the best mode is not too tight, resulting in secondary mode locking).
2. Reset the position of the mold clamping and adjust the position of the travel switch and the electronic ruler;
3. Check the computer input and output conditions and lines;
4. Clamping mechanism inspection.
Nine, the injection is good and bad. Some people say that the retreat ring is broken. How to judge the quality of the anti-back ring?
1. If it is an old-fashioned anti-back ring with a gasket, the material can not be sealed, and the screw will move forward while rotating.
2. If the anti-back ring is broken, there will be a phenomenon of missing the material when the injection is made;
3. There is also a way to judge the anti-back ring, that is, first hit a semi-automatic injection, and then hit the manual before opening the mold, after a few minutes, then hit the semi-automatic, let it inject, see how much the screw can advance, if If you go in a little bit and then pop up to retreat, it means that the anti-back ring is good. If you can get a lot, and there is no material overflow, the screw will turn in and out, it is definitely broken.
Ten, Haitian machine, a boot position of its injection of glue will be beating. Check the electronic ruler, but also specially changed a new one, the motherboard's socket has also been checked for no looseness, the fault is still there.
1. There is a problem with the injection valve;
2. There is an injection signal output;
3. Electric heating, the material temperature is too high. The screw moves;
4. Poor contact or partial short circuit of the injected electronic ruler line, voltage fluctuation;
5. Check the grounding, electronic ruler screen closed layer inspection.