Plastic injection molding as a mature plastic injection mold processing has broad prospects for development. With the emergence of new technologies, new materials and new needs, plastic injection molding will continue to adapt to market changes and innovative development to provide higher quality plastic products for industrial manufacturing and consumers.

First of all, plastic injection molding is a process in which molten plastic materials are injected into molds and then cured by cooling to make plastic products. The basic principle is as follows:

1. Heating and melting: heating plastic particles or powder to a molten state usually needs to be carried out in the injection machine. After heating, the plastic becomes viscous and flowing, and can be pushed into the mold by the injection machine.

2. Fill the mold: The molten plastic material is injected into the mold by the injection machine. The injection machine applies high pressure to make the plastic flow and fill the entire mold chamber.

3. Cooling and curing: the plastic material in the mold needs to be cooled to make it solidify. The cooling time and temperature depend on factors such as the type and thickness of the material. The specific design of the mold will also affect the cooling time and quality.

4. Open the mold and take out the molded part: After cooling and curing, open the mold and take out the molded part. Usually, the mold is coated with some release agent to help the formed part detach easily from the mold.

5. Removal of residual materials, dressing and processing: After taking out the molded part, it is necessary to remove the excess plastic materials and residual materials, and the molded part is dressed and processed. This can be done by hand or machine.

6. Inspection and packaging: Finally, the finished product needs to be inspected to ensure that its quality meets the requirements, and then packaging and transportation.

The principle of plastic injection molding is relatively simple, but to obtain high-quality molded parts, you need to master some skills and operating methods. For example, parameters such as pressure, temperature and flow rate of the injection machine need to be controlled to ensure the accuracy and quality of the injection. Mold design and manufacturing also need to consider factors such as materials, processing accuracy and the life cycle of the mold.

Secondly, plastic injection molding includes the following seven processes:

1. Mold preparation: It is necessary to prepare the molds required for the manufacture of plastic products in advance, including design, manufacturing and installation. The design of the mold should be carried out according to the shape, size and material characteristics of the required products, and factors such as the material and processing accuracy of the mold need to be considered during manufacturing.

2. Preparation of plastic materials: Plastic materials need to be selected and processed according to the requirements of the required product, usually the plastic particles or powder is heated to a molten state, and then injected into the mold by the injection machine.

3. Injection: Injection is the process of injecting the molten plastic material into the mold through the injection machine, and it is necessary to control the pressure, speed and temperature of the injection machine to ensure the accuracy and quality of the injection.

4. Cooling: After injection molding, it is necessary to wait for a period of time to fully cool and cure the plastic material.

5. Opening mold: After cooling, it is necessary to open the mold and take out the injection parts. There are many ways to open the mold, including manual, mechanical and hydraulic.

6. Slag removal, dressing and processing: After taking out the injection parts, it is necessary to carry out follow-up treatment such as slag removal, dressing and processing to remove excess plastic materials, smooth the surface and the holes required for processing.

7. Inspection and packaging: Finally, the finished product needs to be inspected to ensure that its quality meets the requirements, and then packaging and transportation.

The above is a typical process flow of injection molding, where the specific details and parameters of each step need to be adjusted according to the requirements of the desired product and the characteristics of the production equipment. The principle of injection molding is relatively simple, but to obtain high-quality molded parts, you need to master some skills and operating methods.