Injection Molding: Case Study of External Threads

helen84827
Oct 30
1 min read

Last time we talked about injection-molded parts with internal threads. Today, we will share the corresponding injection-molded parts with external threads. Injection-molded parts with external threads are widely used in many fields.

Features and Applications of External Threads

External threads may be used for assembly with other internally threaded components or for fixed installations on specific equipment. The threaded structure of such injection-molded parts provides a reliable connection method, meeting the functional requirements of diverse products.

Key Points in Mold Design

The production of injection-molded parts featuring external threads by injection molding factories imposes significant demands on mold design. For external threads, threaded rings are typically employed for forming. During demolding, appropriate mechanisms must also facilitate separation between the threaded ring and the molded part. This may involve utilising techniques such as side core pulling or inclined ejector pins to ensure the external threaded section is released smoothly from the mold without damage.

Forming Challenges and Quality Control

Similarly, just like the internal thread injection molded parts mentioned last time, during the injection molding process, the filling, cooling, and other links of the plastic must be precisely controlled to ensure the dimensional accuracy and shape integrity of the thread.