How to maintain the injection molding machine according to the operating procedures of the injection

Check and adjust all safety facilities every day, and ensure that all safety facilities are normal before using and operating the machine; Check the oil quantity in the lubricating oil tank and add new oil of the same brand; Check the oil level on the hydraulic oil tank. If the oil level drops below the center line of the level gauge, add hydraulic oil above the center line, and add new oil of the same brand; After the previous operation for 1000 hours, the oil suction filter and hydraulic oil shall be replaced or cleaned, and the oil tank shall be cleaned; When running for 5000 hours or at most one year, it is necessary to replace or clean the air filter and hydraulic oil. Note that the old and new hydraulic oil cannot be mixed; When operating for 20000 hours or up to 5 years, check and replace the sealing ring and wear ring of the hydraulic cylinder and replace the high-pressure hose; Replace the controller (host) battery every 3 years; Replace the battery on the operation panel every 5 years.

2. Pay attention to lubrication

During the use of the injection molding machine, it is necessary to regularly observe whether the lubrication points of the injection molding machine are in normal working state. Note that the time for each lubrication must be sufficient to ensure that each lubrication point of the whole lubrication system is well lubricated. The lubrication modulus (interval time) of the machine and the time of each lubrication are realized through the reasonable setting of computer parameters. Regularly observe the working condition of the lubrication system and keep the lubricating oil in the oil tank at a reasonable level. In case of poor lubrication, timely lubricate and check the lubrication condition of each lubrication point to ensure good lubrication of the machine.

3. Check the air filter

The function of the air filter of the oil tank is to breathe the oil tank and prevent external dirt such as dust from entering the oil tank. Therefore, it is a very important component and needs regular maintenance. The air filter is installed on the top of the oil tank. To clean, loosen the cover first, replace the air filter element, and then tighten the cover again. Note that the cover must be tightened, otherwise oil will spill.

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Injection molding machine maintenance

Operating procedures of injection molding machine

1.1 preparations before starting the injection molding machine

1. Clean up the surrounding environment of the equipment and do not store articles unrelated to production.

2. Clean the sundries inside and outside the workbench and equipment, and wipe the injection guide seat and the pull rod of the clamping part with clean cotton sand.

3. Check the control switches, buttons, electrical circuits, operating handles and hand wheels of the equipment for damage or failure. All switches and handles shall be in the "off" position.

4. Check whether the safety protection devices of all parts of the equipment are intact, sensitive and reliable. Check whether the test "emergency stop" is effective and reliable, whether the safety door slides flexibly, and whether the limit switch can be touched when opening and closing.

5. The safety protection devices on the equipment (such as mechanical lock rod, stop plate, various safety protection switches, etc.) are not allowed to move freely, and it is not allowed to refit or deliberately disable them.

6. Check whether the screws at all parts are tightened and loose. If any abnormal or damaged parts are found, report to the foreman, who will deal with it by himself or notify the maintenance personnel to deal with it.

7. Check each cooling water pipeline, try to connect water, and check whether the water flow is unobstructed, blocked or leaked.

8. Check whether there are foreign matters in the hopper. No articles are allowed to be stored above the hopper. The hopper cover should be covered to prevent dust and sundries from falling into the hopper.

1.2 startup of injection molding machine

1. Turn on the main power switch of the machine tool, check whether the equipment is leaking electricity, preheat the barrel and mold according to the set process temperature requirements, and keep the barrel warm for more than 20 minutes when the barrel temperature reaches the process temperature to ensure the uniform temperature of all parts of the barrel.

2. Open the cooling water valve of the oil cooler, cool the oil return and water pipe, jog and start the oil pump. If no abnormality is found, the oil pump can be officially started. The operation can be started only after "horse open" is displayed on the screen, and check whether the function of the safety door is normal.

3. Manually start the screw rotation and check whether the screw rotation sound is abnormal and stuck.

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Operating procedures of injection molding machine

How to select injection molding machine

1. Select the right type: the model and series are determined by products and plastics.

Since there are many kinds of injection molding machines, it is necessary to correctly judge which kind of injection molding machine this product is suitable for, such as vertical and horizontal, or which series of injection molding machines. For example, general thermoplastic plastics or bakelite raw materials or PET raw materials are monochrome, two-color, multi-color, sandwich or mixed color. In addition, some products need conditions such as high stability (closed loop), high precision, ultra-high firing rate, high ejection pressure or rapid production (multi loop), and appropriate series must also be selected for production.

2. Fit: determine whether the "large column inner distance", "die thickness", "die small size" and "die disc size" of the machine are appropriate according to the die size, so as to confirm whether the die can fit.

(1) The width and height of the mold shall be less than or at least one side less than the inner distance of the large column.

(2) The width and height of the die are within the size range of the die plate.

(3) The thickness of the mold should be between the mold thickness of the injection molding machine.

(4) The width and height of the mold shall meet the small mold size recommended by the injection molding machine, and it is not allowed to be too small.

3. Get: determine whether the "mold opening stroke" and "mold supporting stroke" are enough for the finished product to be taken out from the mold and finished product.

(1) The mold opening stroke shall be at least twice the height of the finished product in the mold opening and closing direction, and the length of the vertical sprue shall be included.

(2) The mold supporting stroke shall be enough to eject the finished product.

4. Lockable: the tonnage of "clamping force" is determined by the product and plastic.

When the raw material is injected into the mold cavity with high pressure, a mold supporting force will be generated. Therefore, the mold locking unit of the injection molding machine must provide sufficient "mold locking force" to prevent the mold from being opened. The clamping force demand is calculated as follows:

(1) Calculate the projected area of the finished product in the direction of switching die from the appearance size of the finished product.

(2) Formwork supporting force = projected area of finished product in the direction of mold opening and closing (cm2) × Number of mold holes × In mold pressure (kg / cm2).

(3) The pressure in the mold varies with the raw material. Generally, the raw material is 350 ~ 400kg / cm2.

(4) The clamping force of the machine needs to be greater than the supporting force, and for the sake of insurance, the clamping force of the machine usually needs to be greater than 1.17 times of the supporting force.

So far, the specification of the clamping unit has been preliminarily determined and the tonnage of the model has been roughly determined. Then, the following steps must be carried out to confirm which injection unit has a screw diameter that meets the requirements.