Summary of problems in the injection molding workshop production process
Plastic Mold
1. Press and hold the safety door switch by hand to operate the machine without stop rod;
2. If the hopper is difficult to discharge, no magnetic stand is needed;
4. If the mold is not closed, the shooting table will move forward;
5. There is no low-voltage protection or failure of low-voltage protection during mold clamping;
6. The injection safety door fails and continues production with danger;
7. For equipment with two-hand brake switch, short-circuit one and complete it with one hand (such as vertical injection molding machine);
8. Many people operate the machine at the same time;
9. When the motor is just started, press the operation key to do the action;
10. The high pressure is raised when the machine is stopped, and the mold cannot be opened when it is produced again;
11. When the equipment is repaired, the power is not turned off, the motor is not turned off, and the warning sign is not hung!
12. When low pressure alarm, increase the high pressure position;
13. When manual mold clamping fails to close, increase the operating intensity of your hands (twist the switch hard or poke the buttons hard);
14. In order to make the material go down faster, use a hard object to poke the feed opening when the screw returns!
15. Coveting convenience and saving time, the press block is not upright when the mold is loaded!
16. When the screw temperature of the injection molding machine is not reached, reduce the temperature and return the material, causing the screw to break!
17. Use a crane to lift the injection mold without removing the pressure plate;
18. The main runner sticks to the mold, instead of using a copper rod to knock with an iron rod;
19. The main runner sticks to the mold, and the main runner is directly hard “squeezed out” by the injection action when the mold is not closed;
20. The product is too full, sticks to the movable mold, and is ejected repeatedly with full pressure and full speed, the thimble is broken, and the ejector is deformed;
21. The gate is too small, the product is not full, the barrel temperature rises sharply, and the material decomposes;
22. The drawing pin is worn and the runner material is not easy to fall off, so use the high pressure and low speed at the end of the mold to harden it or pull the ring to force it;
23. The product is fixed to the mold, and the mold is directly closed, trying to pull the product out;
24. Remove the water pipe from the mold and let the water leak into the electric box, causing the computer to black screen and the main board to burn out;
25. The motor start protection is set improperly, it will act immediately as long as it is started, there is no corresponding delay time, and the motor will be damaged;
27. Clamp the mold with paper pad on one side of the mold (the parts have burrs), which may cause deformation of the clamping mechanism and even breakage of the pillars;
28. The front mold of the product is stuck with hot glue and the clamping mold is hard pulled out;
29. If the temperature of the plastic injection barrel is not enough (or the set temperature does not match the required temperature of the material), start the melt screw;
30. Used in raw material (recycled material) without magnet holder;
31. The cooling water pipe of the plastic injection cylinder is still in use if it is not connected or not opened;
32. Production of easily decomposable and corrosive materials such as PVC, Bakelite, and the material in the barrel, stop until it is emptied;
33. If the hot runner mold thermostat of the injection mold does not heat up, replace the control table (do not check whether the mold and thermostat are faulty) and burn the table repeatedly;
34. Pull out the plug on the mold when the thermostat power is turned off;
35. If the machine motor is not turned off or the power supply is turned off, it will enter the mold to work;
36. After the injection mold is placed on the mold, the mold is opened without the anti-opening piece (the steel bar that is not allowed to be opened before and after fixing);
37. After the injection mold is installed, the mold will be opened when the crown block is not lowered;
38. The oil delivery pipe of the oil pump sees oil or is slightly cracked, so it should be tied up with tape or other cloth strips and used barely;
39. The wires are bare, just bundle them with transparent tape and leave them wherever they are;
40. The abnormal alarm is high-pressure mold locking without finding the cause;
41. After a short shutdown and restarting, there is no time to glue glue, just start directly; +
43. After the hot runner mold is loaded, turn on the electric heating switch first, and then turn on the water (the hot runner will be heated by leaking water);
44. The upper mold is unbalanced, and the low pressure lock is increased when the mold cannot be closed;
45. When trying out molds or producing small batches, in order to save troubles, only 4 die sets or no water are connected;
46. In order to be cheap, short-circuit the safety switch of the rear safety door;
47. Ineffective use or non-use of mechanical safety gates, it is estimated that 80% of factories have done so;
48. The mold that needs to be heated for mold trial is directly heated by the huoqiang burning cavity;
49. The safety stick is broken, tied with a rope, and continue production without processing;
50. The product won’t drop after multiple thimbles. When it is fully automatic, forcibly take samples from above, be careful!
51. When the hydraulic oil is insufficient, continue production. The lower limit of the hydraulic oil will last for a long time. It is easy to damage the quantitative pump. If it does not work, open the circulating water pipe and add some water;
52. Do not look at the several ejector pins installed on the machine before the die is loaded, and the ejector pin will be forced to increase the ejector pin pressure, resulting in…
53. If the product thimble position is oily, use fire to burn the thimble directly;
54. When the mold is forced to reset, be lazy and not install!
55. There are safety protection devices, so be lazy and not install!
56. Do not meet the requirements and force high pressure clamping and injection!
57. The core-pulling tubing is too long, short-circuit the card switch and do not close the safety door!
58. In order to save effort for opening and closing the door, the mechanical safety block should be hung with a rope, or simply not used!
59. Remove the plastic injection protective cover and use it to facilitate the removal of the plastic block;
60. Lift the mold without opening the mold and lift the machine;
61. For molds with core-pulling, open the mold regardless of the order, and the mold will be broken;
62. Product demoulding is not good. Polish the EDM surface;
63. The thin-walled product card mold is drawn with copper wire, but when the copper wire is knocked flat, it is directly knocked on the pillar;
64. Upper and lower molds, hoist the mold to the machine to set the position, do not press it with the pressure plate in time, do other things, others open the mold without knowing it, and the mold falls down;
65. The product is stuck to the fixed mold, and the copper rod is not found, and the iron rod is used to knock the mold out;
66. When the hot runner mold is flowing glue, because the hot nozzle is too deep, the temperature will increase without confirming the decomposition temperature of the raw materials, and try to melt the cold glue;
67. When hoisting the mold, it does not check whether the hoisting ring is properly installed, and the mold is dropped during operation;
68. The mold is hung in the air to adjust the thickness of the mold;
69. The core-pulling setting is reversed, directly semi-automatically, and the mold hits;
70. Externally rotate the injection molding machine nozzle to reduce the length of the thread and extend the nozzle (when the injection molding machine nozzle is not long enough);
71. If the mold ejector plate has a micro switch, it will be produced without wiring;
72. Both the ejector and the slider are operated by a hydraulic cylinder, and there is an ejector rod under the slider, and the neutron tubing is not connected according to the mark, or the tubing is connected at the same time (the slider is topped);
73. Use a hook or a sling, the ring is not tightened, the hook or sling rotates with the mold, the ring and the mold are easy to fall off;
74. If the hot mouth is blocked, knock it with a copper rod;
75. If the material is leaking, increase the pressure speed of the shooting seat and hit the mold;
76. If the nozzle heating ring is broken, use fire to burn it again;
77. Mold clamping is not smooth, use high pressure and high speed to rush (also do not confirm whether the mold is incorrect or lack of lubrication);
78. The screw speed is slow, use high pressure and high speed to rotate (do not confirm whether the temperature is appropriate);
79. If the product is dissatisfied, use high pressure and hard press (not to confirm whether the temperature is appropriate);
80. If the nozzle and flange cannot be removed, use an afterburner to knock it hard;
81. When the mold is lowered, the positioning ring is stuck, and the seat is used to enter the hard top;
82. The product sticks to the mold, and the copper rod is used to pry hard;
83. The nozzle is clogged, and the product is not full enough to put pressure on the nozzle-not to remove the nozzle;
84. When loading a large mold, be afraid that the mold is not safe-use a particularly long afterburner to press hard;
85. During production, if the oil temperature or material temperature deviation is adjusted, the upper and lower limit range is increased-without checking the reason;
86. During normal operation, if there is a problem with the product, adjust the parameters-without analyzing the reason: such as the mold temperature rise;
87. Turn off the alarm function when the manipulator always alarms-do not eliminate the fault;
88. If the machine oil temperature is too high, pull out the thermocouple;
89. When the slider does not slide smoothly, just loosen the slider screw and continue production without checking!
90. The mold core of the injection mold is not well sealed, and a slight water gushes out. Due to the small batch size, it is barely produced, resulting in rust on the etched surface;
91. The mold core parts of the injection mold are loose or damaged, because the quantity to be produced is not much, and the production is barely, which causes damage to other mold parts and increases the difficulty of repair;
92. The product sticks to the mold and burns directly on the mold with tongs;
93. The upper mold does not confirm the thimble reset confirmation switch;