What should you pay attention to when designing injection molded plastic parts?

Injection molding is an efficient way to produce plastic parts and is widely used in industries such as automobiles, electronics, and medical devices. However, to design high-quality injection molded parts, not only the appearance must be considered, but also the manufacturing process and functional requirements must be taken into consideration. The following are several key points in the design of plastic parts in injection molding:

1. Wall thickness uniformity
When designing plastic parts, uniformity of wall thickness is very important. Uneven wall thickness can cause shrinkage deformation or surface defects in injection molded parts. Generally, the wall thickness should be controlled between 0.5mm and 5mm, and adjusted according to material properties and usage requirements.

2. Draft angle
Draft angle is a key design factor to ensure that plastic parts can be successfully removed from the mold. Normally, the surface perpendicular to the mold parting surface needs to be designed with a draft angle of 1° to 3° to reduce resistance and wear during demoulding.

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3. Reinforcing ribs and structural optimization
In order to increase the strength of plastic parts, reinforcement ribs can be added to the design. However, it should be noted that the thickness of the reinforcing ribs should not exceed 60% of the main wall thickness to avoid unnecessary stress concentration and shrinkage marks.

4. Rounded corner design
Sharp corners can easily cause stress concentration, leading to cracks or damage to plastic parts. Therefore, it is recommended to use rounded transitions in the design, not only to increase strength but also to optimize material flow.

5. Material selection
Choosing the right plastic material is crucial. Materials such as ABS, PP, and PC can meet the needs of various industries due to their different physical and chemical properties. Designers should select the appropriate material based on the end use and consider its shrinkage, heat resistance and strength.

Through scientific design and reasonable optimization, the production efficiency and performance of injection molded parts can be significantly improved. In the future, with the development of computer-aided design (CAD) and simulation technology, the design of injection molded plastic parts will be more refined and intelligent, bringing more possibilities to the manufacturing industry.