What Are Ejector Sleeves?

Ejector sleeves are critical components in injection molding systems, designed to protect ejector pins from bending or premature wear by providing a precise, durable guide channel. Typically manufactured from high-grade tool steel, these sleeves ensure smooth ejection of molded parts, reduce maintenance downtime, and extend the overall lifespan of the mold. They are essential for high-volume production environments where precision and reliability are paramount.

Key Features and Benefits

• High Wear Resistance: Made from hardened steel, ejector sleeves withstand repeated friction and high-pressure cycles.
• Precision Engineering: Manufactured to tight tolerances for consistent alignment and smooth operation.
• Corrosion Resistance: Surface treatments like nitriding or chrome plating protect against rust and chemical exposure.
• Extended Mold Life: Reduces stress on ejector pins, minimizing breakage and mold damage.
• Versatility: Compatible with a wide range of molding machines and plastic materials.

Detailed Product Specifications

Ejector sleeves are available in various standard and custom sizes to meet specific application requirements. Below are the typical dimensional and material specifications:

Available Sizes and Tolerances

To ensure compatibility and performance, our ejector sleeves are produced in precise dimensions. The following list outlines common standard sizes:

• Outer Diameter (mm): 6, 8, 10, 12, 16
• Inner Diameter (mm): 3, 4, 5, 6, 8
• Standard Lengths (mm): 25, 50, 75, 100, 150, 200
• Custom Sizes: Available upon request with specific tolerance requirements.

Material Composition and Properties

The performance of ejector sleeves heavily relies on material selection. We use premium alloys to ensure durability and efficiency.

Applications in Various Industries

Ejector sleeves are utilized across multiple sectors for precision molding applications:

• Automotive: Production of interior trim, dashboards, and light housings.
• Consumer Electronics: Molding of phone cases, connectors, and small components.
• Medical Devices: Manufacturing of syringe barrels, housings, and disposable parts.
• Packaging: Creating thin-walled containers and lids.

Installation and Maintenance Guidelines

Proper installation and care are crucial for optimal performance. Follow these steps for best results:

• Ensure the mold plate and sleeve bore are clean and free of debris.
• Lubricate the sleeve lightly with a high-temperature mold release agent.
• Press the sleeve into the bore using a proper arbor press; avoid hammering.
• Regularly inspect for signs of wear, scoring, or corrosion during routine maintenance.
• Replace sleeves if inner diameter wear exceeds 0.05mm to prevent ejector pin failure.