What are points of starting injection molding production?

Time:2023-02-08 08:24:13 / Popularity: / Source:

One: Operation requirements:

What are points of starting injection molding production 
1. Before machine is heated to start production, cooling water valve must be opened to observe whether water channel is unobstructed.
2. Close power switch on the side of control box, turn on power supply in machine, and press motor start button on panel to start oil pump motor.
3. For machine that is used for the first time and has not been used for a long time, after oil pump is started, it must be run empty for a few minutes before starting to operate.
4. Turn on heating switch of barrel, turn on electric heating power, adjust constant temperature nozzle and temperature controller on box door, set temperature, and observe current of ammeter to determine quality of electric heating ring.
5. Test run should be carried out in sequence from manual → semi-automatic → fully automatic, at the same time, check whether important fastening bolts are loose, and stop immediately if any abnormality is found. When it is confirmed that it is normal or fault is eliminated, test drive is carried out.
6. Barrel should be cleaned when processing is stopped or material is changed. Cleaning should be carried out under condition of heating barrel. When cleaning is over, heating switch should be turned off immediately. Cleaning is particularly important for processing of easily decomposed plastics.
① Injector should be returned when cleaning.
②Temperature setting when two raw materials are alternated should be adjusted according to requirements of high-melting material.
③ Clean decomposed material with polystyrene.
7. When processing stops, first turn action operation switch to manual position, other action switches are placed in disconnected OO position, barrel heating switch is turned to OFF, press motor stop button to turn off oil pump motor, finally turn off power switch to end work.

Two: Precautions for use:

What are points of starting injection molding production 
1. When using machine, you must pay attention to operation safety. First, check reliability of safety door. Remember not to put your hand into clamping mechanism when machine is running. When taking products, be sure to open safety door, and close safety door only after confirming safety of personnel or absence of foreign objects in mold. Hands cannot reach between nozzle and mold gate during operation. When repairing mold, oil pump motor must be turned off.
2. Due to variety of raw materials, size and shape of product area, required clamping force is also different. When adjusting mold, please adjust it according to actual minimum clamping force, which can not only save power consumption, but also significantly prolong service life of machine.
3. Pressure adjustment of hydraulic system should be carried out according to requirements of each action, and it should not be too high. Reasonable use of pressure can not only save energy, but also prolong life of machine. Position of each limit switch should also be adjusted according to requirements of finished product, especially adjustment of switching point during injection to pressure holding process must be paid attention to, otherwise product will be insufficiently filled. On the contrary, it will cause product to generate excessive internal stress or flash, and even cause mold to expand, making it difficult to open mold.
4. When there is no material in screw or barrel, it is not advisable to use a high screw speed (preferably below 30 rpm). After raw material fills screw groove (when melt is extruded from nozzle), screw speed is increased to required value. So as not to scratch screw or barrel due to high idle speed or too long time.
5. It takes about thirty minutes for barrel to heat up from room temperature to required temperature. In the case of residual cold material in barrel, it must be kept warm for another ten minutes. Screw can be started for feeding to ensure that residual cold material is fully melted and avoid damage to screw.
6. Safety valve of oil pump in machine has been adjusted at factory, please do not change it at will.
7. Machine starts running, when cooling water temperature rises by 5℃-10℃ (when there is no water in cooler, it must be filled with water first), then gradually open water inlet valve of cooler, adjust water inlet during use to keep oil temperature below 55℃. When starting cooler, remember to open water inlet valve quickly, because when a large amount of cooling water flows through cooler, a layer of "super cooling layer" with poor thermal conductivity will be formed on the surface of cooler tube, even if a large amount of water enters cooler later, result is still not good cooling effect.
What are points of starting injection molding production 
8. Lubrication of machine is strictly carried out according to operation requirements. Running in the condition of lack of oil will seriously wear parts, especially connecting rod and steel sleeve of clamping machine. If there is a lack of oil, it may bite and be unable to work. .
9. Connecting screw parts of heating and plasticizing parts such as barrel and screw work at high temperature. When disassembling and assembling, thread part should be coated with heat-resistant grease (red dan or copper disulfide), so as to avoid bite and cannot be disassembled.
10. Mold mounting surface of mold plate has high machining accuracy. Please do not use mounting surface and mold with poor parallelism and bad screws, so as not to damage performance of mold plate and clamping mechanism.
11. Please do not keep mold in clamping state for a long time (more than ten minutes) on two planes of mold installation, so as to avoid oil breakage of connecting rod pin and steel sleeve, which may prevent mold from being opened.
12. Always keep moving with each other and keep surface clean.
13. At the end of each processing:
①Close hopper blanking plate, and use "manual" operation mode. Injection seat moves back and repeats pre-plastic feeding and injection, and remaining material in barrel is drained as much as possible.
②"Manual" operation mode is adopted, and closed die is in a free state.
③ Cut off heating power supply, shut off oil pump motor, main power supply and cooling water.
④Do a good job of cleaning and maintenance of machine.
14. Recognize nameplates of each switch during operation, and do not operate it by mistake, so as not to damage machine.
15. During use of electric heating ring, heating and expansion of ring may become loose. Please pay attention to frequent inspection during use and tighten it at any time.
16. Probe of thermocouple should be in good contact with temperature measuring hole end of barrel. It should be checked before starting machine. If contact is found to be poor, it should be tightened at any time.

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