ejector-pin-sleeve

Key Features of Ejector Sleeve Pins : 1. Hollow Design: Fits over a core pin (or mandrel) within the mold, allowing it to push the part edge without interfering with the internal diameter, as explained in. 2.Uniform Force Distribution: Unlike standard round pins, sleeves distribute force around the entire circumference of a, say, circular boss, minimizing the risk of tearing or breaking the plastic part. 3.Material and Hardening: Usually manufactured from high-performance materials like H13 steel (hardened to 48-55 HRC) or SKD61 stainless steel for corrosion resistance, ensuring long-lasting performance under high-pressure conditions. 4.Surface Treatments: Available with DLC (Diamond-Like Carbon) coatings to reduce friction (coefficient 0.1-0.15), enhancing wear resistance and reducing sticking in clean room or medical applications. 5.Minimal Cosmetic Impact: By pushing on the base of a boss, the "witness marks" or pin marks are often hidden, which is crucial for high-quality finished products. Application : Ejector sleeves are primarily used in plastic injection molding for specific part geometries that are prone to sticking or damage. 1. Cylindrical Bosses and Ribs: Ideal for ejecting cylindrical parts with thin walls. 2.Deep Cylindrical Features: Used in projects requiring high-precision removal of hollow, tube-like parts. 3.Sticky Resins: Beneficial for materials that adhere strongly to the core, as the 360-degree force reduces sticking, as shown in. 4.Medical and Precision Parts: Often used in cleanroom molding due to their ability to be treated with friction-reducing coatings. 5.Typical Example: Used to eject plastic caps, threaded parts, and gear assemblies where the entire edge needs to be pushed.