Mold Tech

17 Important Rules for Injection Mold Design, Please Remember

• 2024-09-19

The mold industry is a fundamental sector in manufacturing and is considered the cornerstone of industrial development. It is also an important area in high-tech industries, often referred to as the "magnetic industry" or "turning iron into gold" in industrialized countries like Europe and America.

The following are 17 important rules to consider when designing injection molds:

1. Mold Opening Direction and Parting Lines

   - Ensure that the reinforcement ribs, buckles, and protrusions of the product are designed to align with the mold opening direction to minimize core pulling and extend mold life.

2. Draft Angle

   - Proper draft angles can prevent product flash and damage during demolding.

3. Wall Thickness

   - Maintain uniform wall thickness to avoid surface shrinkage and air pockets.

4. Ribs

   - Proper application of ribs can increase product rigidity and reduce deformation.

5. Fillets

   - Design appropriate fillet sizes to avoid stress concentration and facilitate mold processing.

6. Holes

   - Keep hole shapes simple and align them with the mold opening direction to avoid core pulling.

7. Core Pulling and Sliding Mechanisms

   - Design core pulling mechanisms to ensure smooth demolding without compromising appearance or performance.

8. Integral Hinges

   - Utilize the flexibility of PP material to integrate hinges with the product design.

9. Inserts

   - Incorporate inserts to enhance local strength, hardness, and dimensional accuracy, but consider the impact on production cost.

10. Markings

    - Place product markings on flat surfaces using raised features to prevent tearing.

11. Precision of Injection Molded Parts

    - Consider the shrinkage rate and uncertainty of injection molded parts to determine appropriate dimensional tolerances.

12. Deformation of Injection Molded Parts

    - Enhance product rigidity to minimize deformation by avoiding flat structures and incorporating reasonable reinforcement.

13. Locating Features

    - Design locating devices to be shared among multiple components for increased durability and precision.

14. Welding (Hot Plate, Ultrasonic, Vibration)

    - Consider welding methods to improve joint strength and simplify product design.

15. Balancing Process and Product Performance

    - Address conflicts between product appearance, performance, and manufacturing processes during product design.

16. Relationship Between Screw Hole Diameter and Self-Tapping Screw Diameter

17. Design Principles for BOSS Features

These rules should be carefully considered during the injection mold design process to ensure the quality and performance of the final product.

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