Elements of injection molding process (2)

1.Pressure
A. Injection pressure: According to the size of the product, the thickness of the wall, from low to high, other factors are considered when debugging.

B. Holding pressure: The holding pressure is mainly to ensure the product's shape and stable size. The setting should also be set according to the structure and shape of the product.

C. Low pressure protection pressure: This pressure mainly protects the mold and minimizes the damage to the mold.

D. Clamping force: It refers to the force required for the mold to close the mold. Some machines can adjust the clamping force, and some cannot.

2.Time
A. Shot time: This time must be set longer than the actual time, and it can also protect the shot. The shot time setting value is about 0.2 seconds greater than the actual value. When setting, you should consider the pressure, Speed ​​and temperature.

B. Low voltage protection time: In the manual state, first set the time to 2 seconds, and then add about 0.02 seconds according to the actual time.

C. Cooling time: This time is generally set according to the size and thickness of the product, but the melting time should not be longer than the cooling time, which can fully shape the product.

D. Holding time: This time is the time for cooling the gate before the melt is allowed to flow back under the pressure of holding pressure to ensure the size of the product after the injection is completed. It can be set according to the size of the gate.

3.Location
A. The opening and closing position can be set according to the corresponding opening and closing speed. The key is to set the starting position of the low pressure protection, that is, the starting position of the low pressure should be the point that is most likely to protect the mold without affecting the cycle, and the ending position. Should be the position where the mold contacts before and after the mold is closed at a slow speed.

B. Ejection position: This position can meet the complete demoulding of the product. Firstly, it should be set from small to large increments. Note that the back position must be set to "0" when the mold is installed, otherwise the mold will be easily damaged.

C. Melt position: calculate the material quantity according to the product size and screw size, and then set the corresponding position.

D. The V-P position should be found from short to large, that is, the Short-Short method to find the V-P position (that is, the V-P switching point).

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