Designing an injection mold is a critical step in the manufacturing process that directly impacts product quality, production efficiency, and overall cost. A well-designed mold ensures that the final plastic part meets all functional, aesthetic, and dimensional requirements while maximizing productivity. Here are the main considerations in injection mold design:

Before designing the mold itself, it’s essential to understand the geometry of the plastic part. Features like wall thickness, rib placement, draft angles, and undercuts must be optimized for moldability. Uniform wall thickness helps avoid warping and sink marks, while appropriate draft angles ensure easy part ejection.

The type of plastic being used affects many aspects of the mold design. Different polymers have unique flow characteristics, shrinkage rates, and cooling requirements. The mold material—typically steel or aluminum—must also be chosen based on production volume and part complexity.

The gate is where molten plastic enters the mold cavity. Its size, location, and type influence flow patterns, cycle time, and part appearance. Runner systems, which guide the plastic to various cavities, must be designed for balanced flow and minimal waste.

Efficient cooling reduces cycle times and improves product consistency. Cooling channels must be strategically placed to ensure even temperature distribution, preventing defects like warping or internal stresses.

Once the part cools, it must be removed without damage. The ejection system—whether using pins, sleeves, or plates—should be carefully designed to avoid deformation and ensure smooth release.

Considering these factors during the design phase not only improves the quality of the final product but also enhances manufacturing efficiency and reduces long-term costs. Thoughtful mold design is the foundation of successful injection molding.

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Precision of the whole mold can reach    0.005mm    Discharge machining accuracy tolerance up to    0.003mm
Precision of molding injection products can reach    0.02mm    Discharge clear angle up to    0.01mm
Mould life time    2 million times    Mirror discharge finish up to    Ra0.2
Mould material hardness    30-90HR    Basic precision of Sardick wire-cutting jogging wire    0.005mm