Five Key Factors of Injection Molding Processing

The five main factors of injection molding are: 

temperature, speed, pressure, time, and position.

1. Temperature

Temperature can be divided into three types: oil temperature, material temperature, and mold temperature.

Oil Temperature: The oil temperature rises due to the frictional heat generated by the hydraulic machine's continuous operation, causing the hydraulic oil temperature to increase. It is regulated by cooling water. When starting the machine, it is necessary to confirm that the oil temperature is approximately 45 degrees Celsius. Too high or too low oil temperatures will affect the pressure transmission effect.

Material Temperature: This refers to the molding temperature of the raw material. The temperature of the barrel is set according to the material and the shape of the product.

2. Speed

Speed refers to the speed setting of opening and closing the mold. The opening and closing mold setting is generally slow-fast-slow. This setting is mainly to protect the mold and the machine. The fast part can improve the product's molding cycle. The parameter setting of the ejector pin is set according to the structure of the mold and the product. If the product has a bulge or whitening when it is ejected, it is recommended to slow down the speed, and then quickly demold, which can shorten the molding cycle. The injection speed is set according to the size of the product. If it is a thin-walled product, use fast speed, and if it is a thick-walled product, use slow speed. The specific setting must also be based on the material's performance, from slow to fast.

3. Pressure

Injection Pressure: It is set from low to high according to the size and wall thickness of the product to reach the appropriate parameters.

Holding Pressure: It mainly ensures the product's setting and stabilizes the size. It is set according to the product's structure.

Low-Pressure Protection Pressure: It mainly protects the mold and minimizes mold damage.

Clamping Force: It refers to the force required for high pressure when the mold is closed. Some robots can adjust the clamping force, and some robots cannot manually adjust the clamping force.

4. Time

Injection Time: This time is longer than the actual time, which can play a protective role for the injection. When setting, the set value is about 0.2 seconds larger than the actual value. Consider whether pressure, speed, and temperature are matched during setting.

Low-Pressure Protection Time: This time can be set to 2 seconds in the manual state. According to the actual time, add about 0.02 seconds.

Cooling Time: This time is set according to the size and thickness of the product, but the plasticizing time should not be greater than the cooling time. It can achieve product setting.

Holding Time: After the injection is completed, in order to ensure the product's size, the time to cool the gate before the melt backflows under the holding pressure. It can be set according to the size of the gate.

5. Position

Opening and Closing Mold Position: It is set according to the corresponding speed of opening and closing the mold. The key is to set the starting position of low-pressure protection. The starting position of low pressure should be the middle stop position that can most likely protect the mold without affecting our cycle. Because when closing the mold at a slow speed, the position where the moving mold contacts the fixed mold.

Ejector Pin Position: This position can meet the complete demolding of the product. First, it is a process from short to long. Pay attention that the retraction position must be set to 0 when the middle mold is reached, otherwise the mold will be damaged.

Plasticizing Position: It calculates the measurement of one material according to the size of the product and the size of the screw, and sets the corresponding position.