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

Every day, it is necessary to inspect and adjust all safety facilities to ensure that they are functioning properly before operating

the machine; Check the oil level 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 centerline of the level gauge, add hydraulic oil above the centerline, and new

oil of the same brand must be added; After 1000 hours of operation, it is necessary to replace or clean the oil suction filter,

hydraulic oil, and oil tank; When running for 5000 hours or more, it is necessary to replace or clean the air filter and hydraulic

oil, and be careful not to mix old and new hydraulic oil; When running for 20000 hours or more for 5 years, check and replace

the sealing ring and wear-resistant ring of the hydraulic cylinder, and replace the high-pressure hose; Replace the controller

(host) battery every 3 years; Replace the battery on the control 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 condition. Note that the lubrication time must be sufficient each time to

ensure that each lubrication point of the entire lubrication system receives good lubrication. The lubrication modulus (interval

time) of the machine and the time for each lubrication are achieved through the reasonable setting of computer parameters.

Regularly observe the working condition of the lubrication system and maintain a reasonable level of lubricating oil in the oil

tank. If poor lubrication is found, it should be lubricated in a timely manner and the lubrication condition of each lubrication

point should be checked to ensure good lubrication of the machine.

3. Check the air filter

The function of the fuel tank air filter is to breathe in the fuel tank and prevent external dust and dirt from entering the tank.

Therefore, it is a very important component that requires regular maintenance. The air filter is installed on the top of the fuel

tank. When cleaning, first loosen the cover, replace the air filter element, and then tighten the cover again. Be sure to tighten

the cover tightly, otherwise oil will splash out.

Read more

Injection molding machine maintenance

Operating procedures for injection molding machines

1.1 Preparation before starting the injection molding machine

1. Clean up the surrounding environment of the equipment and prohibit the storage of items unrelated to production.

2. Clean up the debris inside and outside the workbench and equipment, and use clean cotton and sand to wipe the injection

guide seat and the clamping rod of the mold.

3. Check whether the control switches, buttons, electrical circuits, operating handles, and handwheels of the equipment are

damaged or malfunctioning. All switches and handles should be in the "off" position.

4. Check whether the safety protection devices of each part of the equipment are intact, sensitive and reliable in operation.

Check whether the "emergency stop" test is effective and reliable, whether the safety door slides flexibly, and whether the limit

switch can be triggered when opening and closing.

5. The safety protection devices on the equipment (such as mechanical lock rods, stop plates, various safety protection

switches, etc.) are not allowed to be moved casually, nor are they allowed to be modified or intentionally rendered ineffective.

6. Check whether the screws in each part are tightened and loose. If any abnormalities or damages are found in the parts,

report to the supervisor. The supervisor should handle it themselves or notify the maintenance personnel to handle it.

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

8. Check for foreign objects in the hopper. No items are allowed to be stored above the hopper, and the hopper cover should

be securely closed to prevent dust and debris from falling into the hopper.

1.2 Injection molding machine startup

1. Close the main power switch of the machine tool, check if there is any leakage in the equipment, preheat the barrel and

mold according to the set process temperature requirements. When the barrel temperature reaches the process temperature,

it must be kept warm for more than 20 minutes to ensure uniform temperature in all parts of the barrel.

2. Open the cooling water valve of the oil cooler, cool the return oil and water supply pipe, and start the oil pump by tapping.

If no abnormal phenomenon is found, the oil pump can be officially started. Wait for the screen to display "Horse Open"

before it can operate. Check if the safety valve is functioning properly.

3. Manually start the screw rotation and check for any abnormal or stuck sound.

Read more

Operating procedures for injection molding machines

How to choose an injection molding machine

1. Select the right type: The model and series are determined by the product and plastic.

As there are many types of injection molding machines, it is necessary to first correctly determine which type of injection

molding machine is suitable for this product, such as vertical and horizontal, or which series of injection molding machines.

For example, general thermoplastic materials, electric wood materials, PET materials, etc. are monochrome, two-color,

multi-color, laminated, or mixed color. In addition, certain products require conditions such as high stability (closed loop), high

precision, ultra-high firing rate, high firing pressure, or rapid production (multi loop), and suitable series must also be selected

for production.

2. Can fit: Determine whether the "large column spacing", "mold thickness", "small mold size", and "mold disk size" of the

machine are appropriate based on the mold size to confirm whether the mold can fit.

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

(2) The width and height of the mold should be within the range of the mold disc size.

(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 should comply with the recommended small mold size for the injection molding machine, and too small is also not acceptable.

3. It can be concluded that the "mold opening stroke" and "mold support stroke" are sufficient to remove the finished product based on the mold and finished product.

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

(2) The mold stroke should be sufficient to push the finished product out.

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

When raw materials are injected into the mold cavity under high pressure, a supporting force is generated, so the locking unit of the injection molding machine must provide sufficient "locking force" to prevent the mold from being stretched open. The calculation of the locking force requirement is as follows:

(1) Calculate the projected area of the finished product in the direction of the switch mold based on its external dimensions.

(2) Supporting force=projected area of the finished product in the direction of the switch mold (cm2) x number of mold holes x pressure inside the mold (kg/cm2).

(3) The pressure inside the mold varies with the raw materials, usually ranging from 350 to 400 kg/cm2.

(4) The machine locking force needs to be greater than the supporting force, and for safety reasons, the machine locking force usually needs to be greater than 1.17 times the supporting force.

This has preliminarily determined the specifications of the clamping unit and roughly determined the tonnage of the model. Next, the following steps must be carried out to confirm which injection unit has a screw diameter that meets the requirements.