Injection Molding: Case Study of Internal Thread

Injection molding is a highly efficient process for mass-producing plastic products. This process features high production efficiency, good dimensional stability, and the ability to form complex structures, making it an indispensable part of modern manufacturing.

Features and Applications of Internal Threads

Injection-molded parts with internal threads are widely used in many fields. They are often used to connect and cooperate with components with external threads, such as the connection between bottle caps and bottle bodies, achieving sealing and fastening through thread engagement.

Key Points in Mold Design

Producing injection-molded parts with internal threads poses significant challenges for mold design in injection molding factories. A common approach involves using a threaded core. During injection molding, this threaded core resides inside the part to form the internal threads. Upon demolding, a specialized rotating or telescoping mechanism is required to extract the threaded core from the part. For instance, gear-driven systems can be employed to achieve the rotational withdrawal of the threaded core.

Forming Challenges and Quality Control

During injection molding, precise control over plastic filling and cooling processes is essential to ensure dimensional accuracy and shape integrity of threads. Concurrently, precision injection molding must prioritize smooth demolding to prevent thread deformation or damage caused by improper ejection. This ensures that injection-molded parts with internal and external threads meet practical connection and assembly requirements in actual use.

Find some internal thread injection molding case studies below:

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