Principles of Plastic Injection Molding Mold Production

 

 

Plastic products are widely used across various industries. Injection molds are an indispensable tool in plastic product manufacturing. The mold determines the product's structure and dimensions. Therefore, to produce high-quality plastic products, it's essential to understand the principles of plastic injection molding mold production, summarized as follows:

1. When designing each injection-molded product, first determine its mold opening direction and parting line to minimize the impact of the core-pulling mechanism and the parting line on the appearance.

 

2. Understand the details and purpose of each component in the mold design.

 

3. Appropriate draft angles can prevent ejection damage, such as whitening, deformation, and breakage.

 

4. Summarize injection molding mold manufacturing experience in practice.

 

5. When designing injection-molded products, the trade-offs between product appearance, performance, and manufacturing process must be comprehensively considered. Sometimes sacrificing some manufacturability can achieve excellent appearance or performance.

 

6. Understand the working process of the injection molding machine to deepen the relationship between the mold and the machine.

 

7. Design the locking mechanism with multiple locking points that can be used simultaneously. This prevents the entire mechanism from malfunctioning due to damage to individual locking points, thus increasing its lifespan. Also, consider adding rounded corners to increase strength.

 

8. Visit the factory to understand the processing technology and the characteristics and limitations of each processing method.

 

9. Product markings are generally placed on relatively flat areas of the product's inner surface and should be raised. Place the markings on surfaces where the normal direction aligns with the mold opening direction to avoid damage from tearing.

 

10. Understand the trial molding results and modification processes of your designed molds and learn from the lessons.

 

11. Inserting inserts into injection molded products can increase local strength, hardness, dimensional accuracy, and allow for the creation of small threaded holes (shafts) to meet various special requirements. However, this will increase product cost.

 

12. Utilize previously successful mold structures in the design process whenever possible.

 

13. Incorporating appropriate rounded corners can also improve mold processing technology. For example, cavities can be directly milled with a radius cutter, avoiding inefficient electrical discharge machining (EDM).

 

14. Learn more about the impact of water immersion in the mold on the finished product.

 

15. Avoid using support pillars alone; instead, connect them to the outer wall or use them with reinforcing ribs to increase their strength and facilitate smoother material flow.

 

16. Study special mold structures and learn about the latest mold technologies.

 

HUIWEN Plastics is a group enterprise specializing in precision mold design and manufacturing, as well as precision injection molded products. The company focuses on providing comprehensive solutions for reputable brands, encompassing product design, precision mold manufacturing, injection molding and assembly, and after-sales service. Our products are widely used in household appliance casings and accessories, medical device injection molding parts, cosmetic packaging injection molding parts, and other fields. Welcome to contact us for inquiries.