First: screw fracture generally has several reasons:

1, the design of the screw itself. For example, the size of the screw design is too small and the diameter is not thick enough.

2, cold start temperature is low.

3, all the original parts of the whole screw are not in a center, not on a dot.

4. The starting speed is set too fast.

5, the cylinder is stuck in the foreign body, such as iron, screws, etc., the pressure is broken when melting.

6, raw material temperature is too low.

7. Metal material.

8, look at the material model pressure and speed.

9, screw and oil motor assembly is not fine.

10, its own screw quality is poor, it is to choose the use of high-quality raw materials Jed screw.

11, the operator violated the operating procedures caused by. There are two main aspects: First, have done PC, PMMA, PA, PET, PBT and other high temperature materials, must use cleaning materials to clean the screw, barrel. No cleaning during refuelling operation. Second, there is no check whether the temperature is enough (sometimes a certain heater on the cylinder is suddenly broken, the thermocouple is broken), remember: different materials should use different screws. Use ordinary screw to beer PC and other low fluidity, high viscosity material is certainly easy to break the screw.

Second: The cause of the reverse ring breakage:

Generally do engineering plastics such as PA+ fiber wear, and the material is related to the production, such as the glue in the end to increase the amount of melt or so is generally the reverse ring broken. The normal rupture of the check ring will be accompanied by serious backglue phenomenon, melting glue, shooting glue are not normal, the check ring is too thin, and the raw material exhaust does not punch.

Third: Analysis of the reasons for the leakage of plastic injection machine:

1. The injection molding machine nozzle flange and the injection molding machine cylinder are not fixed.

2, flange and nozzle contact surface wear.

3, if it is a new flange may not be tight with the machine.

4. When shooting glue and melting glue, the shooting table is not swinging.

Fourth: the reasons for screw glue return:

1. Barrel wear.

2, screw scale wear.

Fifth: the screw spline is not installed into the cylinder, and the screw head of the injection molding machine is broken:

1, the Angle of the glue head does not match the Angle of the French.

2. The screw length is too long, and the rubber head has impact with the flange.

3, if it is the head fracture may be caused by the screw too long impact.

4, if it is the middle of the fracture must be broken by the glue.

5, the bottom words indicate that the precision of the screw head design is not enough.

Anomaly analysis:

1. There is coke on the surface of nitrogen flon screw.

2, injection molding machine screw barrel and auxiliary machine (suction machine) is not clean.

3. Check ring, thrust ring, screw head, front barrel, etc. are unclean or corroded.

4. Flanges and nozzles have burnt substances.

5, the temperature is too high, the melt back pressure is too large.

6. Raw materials are unclean.

7, injection molding machine screw finish is not enough.

8, the material of the nitrogen flon screw itself has problems, and the steel has impurities.

Solution:

1, check the nitrogen flon screw, clean and polish the screw.

2, check the hopper for dust polishing cylinder and clean auxiliary machinery.

3, check whether it is unclean or corroded, clean and polish or replace.

4, check the flange, nozzle, cleaning and polishing or replacement.

5, check the temperature setting of each section, cool down, reduce back pressure.

6, check whether the raw materials have impurities, replace the raw materials.

There are many reasons for the phenomenon of injection molding machine not eating material, and according to your own industry experience, pick up a few of the important reasons to summarize:

1. Check whether the cooling water of the inlet is smooth, and appropriately reduce the temperature of the inlet.

2, plasticizing pressure and speed should not be set too large, screw speed should not be too fast, especially for the production of small products.

4, the design of the screw, the raw materials are different, and different screws are needed after modification. Ordinary screws are not omnipotent.

3. The back pressure valve is damaged or the back pressure is too high.

5, the temperature of the screw feeding port is too high.

6, the feeding port is not smooth.

7, the pressure valve and pressure gauge data is not too high.

8, the temperature of the temperature hole is accurate.

9. Screw wear is serious.

10, no material in the hopper.

Solution:

1, adjust the valve to see if the table changes, repair the back pressure valve or lower the back pressure.

2. Check whether there is a bonding block at the feed port, remove the bonding block, increase and dredge the cooling water.

3. Check the hopper and feeder to make up the raw materials.

4. Check the screw barrel and replace the screw barrel.