How Do You Choose the Right Ejection System for Your Mold?

INDUSTRY

Industrial Components

Large or heavy parts, like machinery housings, often require hydraulic ejection for sufficient force and control.

Air ejection is exclusively used in the medical industry.False

While common in medical applications, air ejection is also used in other industries for delicate or thin-walled parts.

Hydraulic ejection is necessary for large industrial parts.True

Hydraulic systems provide the power needed to eject large, heavy parts without damage.

What Are the Differences Between Mechanical and Non-Mechanical Ejection Systems?

Ejection systems can be categorized into mechanical and non-mechanical types, each with distinct advantages and applications.

Mechanical systems (pins, blades) use physical force, while non-mechanical systems (air, hydraulic) use pressure or fluid power, offering different benefits based on part needs.

3D rendering of an industrial mold design with various components and mechanisms — Injection mold ejection system

Mechanical Ejection

Examples: Pins, blades, sleeves, strippers.
Advantages: Simple, cost-effective, easy to maintain.
Disadvantages: Can leave marks, may not suit delicate parts.

Non-Mechanical Ejection

Examples: Air ejection, hydraulic ejection.
Advantages: Gentle on parts, suitable for complex or large components.
Disadvantages: Higher cost, more complex setup.

Mechanical ejection systems are always preferable due to their simplicity.False

While simple, mechanical systems may not be suitable for all parts, especially delicate or complex ones.

Non-mechanical systems are more versatile for various part types.True

Systems like air or hydraulic ejection can handle a wider range of part geometries and materials.

How Do You Design an Effective Ejection System?

Designing an effective ejection system requires careful consideration of part and mold characteristics to ensure smooth operation and part quality.

An effective ejection system balances force distribution, minimizes part damage, and accommodates material properties, with key design elements like draft angles and ejector placement.

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