What is the difference between cavity injection molding and core injection molding?

1, Definition and Working Principle
Mold cavity injection molding: Mold cavity injection molding refers to the injection molding method that uses the mold cavity part to form the external contour and internal details of plastic products. During the injection molding process, molten plastic is injected into the mold cavity and, after cooling and solidification, forms the desired shape of plastic product. The cavity is usually made of metal or other hard materials, and its design directly determines the appearance, size, and performance of the final product.
Core injection molding: Core injection molding refers to the injection molding method that uses the core part in the mold to form the internal structure of plastic products. The core is usually located at the center or specific position of the mold, and its shape and size match the internal structure of the plastic product. During the injection molding process, the molten plastic not only fills the cavity, but also solidifies around the core, forming a plastic product with an internal structure. The material and design of the core also have a significant impact on the quality of plastic products.
2, Application scenarios and characteristics
Mold cavity injection molding:
Application scenario: Mold cavity injection molding is widely used in the manufacturing of various plastic products with complex external contours and internal details, such as automotive parts, home appliance casings, electronic product casings, etc. These products typically require high precision, high surface finish, and good mechanical properties.
Characteristics: The main feature of cavity injection molding is the ability to form complex and precise external contours and internal details. Due to the fact that the design of the cavity directly determines the appearance and size of the product, cavity injection molding requires extremely high precision and quality of the mold. Meanwhile, cavity injection molding also has high production efficiency and can meet the needs of large-scale production.
Core injection molding:
Application scenario: Core injection molding is mainly used to manufacture plastic products with internal structures, such as gears, bearings, pipelines, etc. These products typically require precise internal dimensions and shapes, as well as good mechanical performance and sealing.
Characteristics: The main features of core injection molding are the ability to form precise internal structures and good mechanical properties. Due to the core being located at the center or specific position of the mold, injection molding of the core requires extremely high precision in mold design and manufacturing. At the same time, core injection molding also needs to consider how to effectively remove the core from the mold to avoid damage to the product.
3, Comparison of advantages and disadvantages
Mold cavity injection molding:
advantage:
Capable of forming complex and precise external contours and internal details.
High production efficiency, suitable for large-scale production.
The product has high surface smoothness and stable quality.
Disadvantages:
The cost of mold manufacturing is relatively high, especially for products with complex shapes.
The maintenance and replacement cycle of molds is relatively long.
Core injection molding:
advantage:
Capable of forming precise internal structures and excellent mechanical properties.
Suitable for manufacturing complex products with internal structures.
Disadvantages:
Mold design and manufacturing are difficult and require high precision.
The product is prone to damage during the removal process and requires special demolding techniques.