Thread Processing in Injection Molds
Thread processing in injection molds refers to the design and manufacturing of mold components used to produce plastic products with internal or external threads.
Thread Types and Design Requirements
1. Thread Types
Internal Threads:
Typically located inside the product, special mechanisms for demolding are required.
External Threads:
Found on the outer surface of the product, easier to process but still requires precision and proper demolding methods.
Special Threads:
Includes non-standard threads, tapered threads, etc., requiring customized processes based on product design needs.
2. Design Requirements
Thread Accuracy:
Ensure precise pitch, diameter, and thread angle to meet functional requirements.
Draft Angle:
Consider demolding difficulty when designing threads, especially for internal threads.
Common Thread Processing Techniques
1. Turning
Threads are processed using a lathe, suitable for the initial machining of threaded mold components.
2. Milling
Threads are machined using thread milling cutters, ideal for high-precision thread structures.
3. Electrical Discharge Machining (EDM)
Used for processing complex thread shapes, such as internal or non-standard threads.
4. Wire-Cut Machining
Applied to certain special shapes or threads that are difficult to process directly.
5. Grinding
Provides fine finishing for threaded components to achieve higher surface smoothness and dimensional accuracy.
Thread Mold Demolding Methods
Demolding is a critical challenge for threaded products. Common methods include:
1. Manual Demolding
Suitable for small-scale production or simple threaded products.
Threads are demolded manually by rotating them.
2. Mechanical Rotational Demolding
Utilizes mechanical devices (e.g., gear mechanisms, chain drives) to rotate and demold threads.
3. Hydraulic Rotational Demolding
Employs hydraulic motors to drive the rotation of threaded sections, enabling the demolding of internal and external threads.
