The Design of Automotive Plastic Injection Moulding

When designing automotive injection molded parts, some basic principles need to be followed to ensure product quality, functionality, and production efficiency. Here are some key design principles:

Basic wall thickness: Appropriate wall thickness: usually 2-3mm, to ensure the rigidity and strength of the parts. Uniform and consistent wall thickness: Avoid local surface depressions, cavities, and other issues caused by uneven wall thickness.

Design of tendons: The ratio of rib thickness to wall thickness: usually follows certain rules to ensure the effectiveness of ribs and the demolding of parts. Draft angle and height: The draft angle of the reinforcement is generally 1-1.5 degrees, with a minimum of not less than 0.5 degrees, to ensure smooth demolding of the parts.

Flanging structure design: The thickness of the flange should be consistent with the basic wall thickness to improve the structural stiffness of the component. The draft angle for flanging: Choose the appropriate draft angle according to the pattern requirements, manufacturing and quality requirements.

Direction of holes: Try to align with the main draft direction of the part to simplify the mold structure. Demoulding slope: When the aspect ratio of the hole is greater than 2, the demoulding slope should be set.

Rounded corner design: Rounded corners and edges are used to avoid stress concentration.

Material selection: Consider the properties of the material, such as strength, toughness, wear resistance, etc., to meet the requirements of the product’s usage environment and performance.

Reasonably control dimensional tolerances: Select the appropriate tolerance range based on product usage requirements and production costs.

By following these basic principles, the design of automotive injection molded parts can ensure product quality, functionality, and production efficiency, while reducing production costs and manufacturing difficulties.

What materials are used in automotive plastic injection moulding?

There are various types of materials used in the production of automotive plastic injection moulding, and selecting the appropriate materials is crucial to ensure the performance, safety, and service life of the product. Here are some commonly used automotive injection molding materials:

Polyamide (PA), also known as nylon, has excellent mechanical properties and dimensional stability, and is widely used in the manufacturing of automotive interior and exterior parts, components, and functional parts.

Polycarbonate (PC): Known for its excellent transparency, impact resistance, and thermal stability, it is commonly used in the manufacture of key interior and exterior components such as car windows, instrument panels, and lighting fixtures.

Polyethylene terephthalate (PET): It has excellent mechanical strength, chemical resistance, and dimensional stability, and is suitable for the manufacturing of automotive interior and exterior parts.

Polymethyl methacrylate (PMMA): Provides a crystal texture and is suitable for manufacturing key exterior components such as car windows and lighting fixtures.

Acrylonitrile Butadiene Styrene (ABS): Due to its excellent durability, reliability, impact resistance, and plasticity, it is widely used in automotive body components.

Material characteristics and application scenarios

PA： Strong wear resistance, long service life, suitable for various harsh environmental conditions.

PC： High transparency, light weight, impact resistance, suitable for vehicle lighting, etc.

PET： High mechanical strength, chemical resistance, relatively low cost, suitable for instrument panels, car door interiors, etc.

PMMA： Excellent weather resistance and chemical resistance, suitable for long-term exposure of automotive parts.

ABS： Easy to process, impact resistant, suitable for instrument panels, bumpers, etc.

The material selection for automotive injection molded parts needs to be determined based on specific application scenarios and performance requirements to ensure the quality and reliability of the final product.

For more information about automotive plastic injection mold, please contact yoyo@yuanfang.com.