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Common sense and precautions of injection molding machine operation (part 2)

4> Processed products
○1 For products with nozzles, they should be processed with nozzle pliers. In the process of processing, be careful and meticulous, not only to cut the nozzle but not to bruise the product.
○2 Process the products with a sharp edge (the edge of the product or the empty hole position and a small amount of colloid in the thimble position).
(1) If the appearance of the position where the front is located is not strict, it can be gently flattened with a medium knife, and the product cannot be scratched.
(2) If the appearance of the position where the front is located is high, and it is the edge of the product, it can only be lightly pressed with a metal rod with a smooth surface (such as a thimble, a copper rod, etc.) jagged).
(3) If the product has oil stains, use nylon gloves to dip in the essence and gently scrub it, and try to wipe it in one direction until it is clean.
5> Packaging
○1 Understand the specific requirements of the "Packaging Operation Instructions" for the products that need to be packaged.
○2 Prepare corresponding packaging materials (such as cartons, cardboard, blister tray, packaging rope, etc.).
○3 When packaging, according to the packaging specifications of different products, use the packaging rope to form a "cross" frame to fasten it.
○4 The packaged products will be labeled by the operator, and the identification contents include product name, model, quantity, color, production date, operator, and planning order number. The label paper must be uniformly affixed to the upper right corner of the cartoon box.
○5 Packaged and marked product boxes should be neatly placed in the "inspection area" specified by the workshop.
6> Treatment of nozzle material, plastic head, and waste products
○1 Nozzle materials, plastic heads and waste products must be packaged separately for reuse.
○2 Ensure that the nozzle materials and scrapped products are not polluted and not mixed with other sundries.
7> Precautions
○1 Once the operator finds a machine failure or electrical failure, he should immediately stop the oil pump motor, cut off the power supply, and report to the workshop manager immediately.
○2 During the injection molding production process, the operator must take the product from the front safety door, and cannot directly touch the high temperature device such as the heating tube with their hands to prevent burns.
○3 Operators cannot change any injection molding process parameters without permission. .
○4 During the working process of the injection molding machine, the operator shall not leave the work position without authorization, and shall not discuss topics unrelated to the work with others.
○5 Within the first ten minutes of starting the machine (or picking up the machine), the operator must carefully observe whether the operation of each lubricating block and thimble of the mold is normal and whether there is a lack of lubricating oil; if there is any abnormality, immediately report to the workshop management personnel.
○6 During the operation, the operator must obey the quality instructions of the quality inspector. The defective products that have been checked by themselves must be finally confirmed by the workshop quality inspector before they can be placed in the waste bin.
○7 When handing over the shift, the operator should clearly inform the successor of the important things that happened on the shift.
4. Drying of plastic
1> Purpose: To ensure that the plastic can be fully dried as required, and that qualified products can be produced. 2> Scope of application: It is suitable for drying of ABS, PC+ABS, and PC raw materials in the injection molding workshop. 3> Steps and methods
○1 Before feeding, check whether there is any residual material in the hopper. If there is, it is necessary to confirm whether the residual material is consistent with the type and color of the raw material required for production. Scrub.
(1) Use an air gun to blow off the dust outside the hopper, then open the hopper and scrub with a rag.
(2) If there are stains that are difficult to clean in the bucket, it can be washed with appropriate water to remove stains until it is clean.
○2 Cleaning the melt barrel
(1) While cleaning the hopper, turn on the heating power supply of the melting cylinder to make the temperature reach (PC+ABS) 260℃-290℃; PC material 290℃-350℃.
(2) When cleaning the melt tube, the nozzle material of the same color as the product to be produced or a lighter color nozzle material can be used, preferably acrylic nozzle material.
(3) Repeatedly shoot the glue at a slow speed and hold the glue until it is cleaned, and the glue injected in the barrel is the same color as the material to be produced.
(4) For the melt cylinder that is difficult to clean, add 1% screw cleaning agent to the nozzle material for cleaning.
(5) After cleaning the hopper and the glue barrel, add the plastic to be dried into the hopper, do not add too much, leave a space of 5-10cm (or set the feeding line for easy observation) to facilitate the removal of water vapor. Then turn on the power and adjust the thermostat to (PC+ABS) about 95°C, bake for more than 3.5 hours before production, but not more than 6 hours; the PC material temperature can be adjusted to about 110°C, and bake for more than 4 hours. before production, but not more than 6 hours.
4> Precautions
○1 When starting production, the operator should shoot the overheated material in the melt tube until the injected fluid material has no foaming phenomenon, and it looks moist and clean before the official beer plastic product. Due to overheating, the residual material will be degraded and carbonized, resulting in product cracking.
○2 During production, if there is a color deviation or color mixing, and can be repeated.
5. Mold installation
1> Purpose: To ensure that the mold can run normally, and the nozzle position does not leak glue.
2> Installation steps
○1 According to the arrangement of the "Injection Production Plan", the operator finds the corresponding mold, and uses the mold car to pull the mold to the designated injection molding machine.
○2 Check the mold.
(1) Whether the model number is consistent with the requirements of the "Injection Production Plan".
(2) Whether the thimble and spring are broken, if there is any problem, they should be repaired.
(3) Whether the lubrication of the thimble and guidepost slider is sufficient, if the lubrication is insufficient, thimble oil should be added to the thimble, and butter should be added to the guidepost of the slider.
(4) Whether the water channel is blocked by debris, if so, use an air gun to clean it until the water channel is unblocked and then put on the mold.
(5) Check whether the screw hole of the lifting ring is centered. If it is eccentric, the front and rear molds need to be put on the lifting ring at the same time, and the front and rear mold lifting rings should be pierced with an iron chain before the mold is loaded.
○3 Molding
(1) The mold rises to about 1.1-1.3 meters, and the operator installs the copper water pipe under the mold according to the actual situation. (Note: The tooth pattern specification of the copper water pipe must be the same as the tooth pattern specification of the mold, otherwise the copper water pipe tooth pattern will be damaged).
(2) During the mold up and down process, the operator should not stand under the mold to ensure personal safety.
(3) Hang the mold between the head plate, the second plate, and the left and right glin columns of the injection molding machine, and then slowly lower it. When the nozzle of the mold and the injection nozzle of the injection molding machine is basically consistent, start the oil pump of the injection molding machine. At the same time, try to slow down the mold opening and locking speed of the injection molding machine to try to lock the mold.
(4) If the thickness of the mold does not match the distance between the injection molding machine head plate and the second plate, the operator must start the mold adjustment motor on the injection molding machine. Select the advance and retreat button of mold adjustment, so that the size between the head plate and the second plate is basically consistent with the thickness of the mold, and at the same time, pay attention to observe the total pressure gauge on the injection molding machine, which must reach 50kgf/cm2.
(5) The operator chooses manual operation, moves the shooting table, and observes whether the nozzle of the mold matches the nozzle of the injection molding machine.
(6) If it is completely matched, tighten the screw of the code mold of the front and rear molds.
(7) Connect the water transport of the front and rear molds, and check for water leakage.