Extruder Ejector Pin - Core Actuation Component for Precision Forming

I. Product Positioning

The extruder ejector pin is a critical actuation and force-transmission component in extrusion molding systems (including metal hot/cold extrusion presses and plastic extrusion equipment). It is fabricated using high-grade alloy steel and special composite materials through precision forging, CNC grinding, heat treatment strengthening, and surface hardening processes. Specifically engineered for molded part ejection, pressure transmission, and mold cavity cleaning during extrusion, it undertakes core functions such as pushing formed workpieces out of molds, transmitting extrusion force to billets, and ensuring smooth demolding of complex components. As a key guarantee for extrusion efficiency and product precision, it is suitable for high-temperature (up to 600℃), high-pressure (≤50000kN), and high-wear working conditions in metal processing, plastic molding, and powder metallurgy fields.

II. Core Advantages

1. High-Strength Force Transmission, Structural Reliability: Adopts premium base materials including 45# steel, 38CrMoAlA nitrided steel, and dual-alloy composites. After quenching-tempering heat treatment and shot peening, the tensile strength reaches ≥1200MPa, yield strength ≥980MPa, and impact toughness ≥40J/cm². It can stably bear extrusion loads (maximum applicable pressure ≤50000kN) and cyclic impact forces during continuous operation, with a structural safety factor ≥2.0 to eliminate fracture risks.
2. Ultra-Precision Machining, Consistent Demolding: Utilizes CNC grinding machines and cold extrusion rolling processes, achieving dimensional tolerance ≤±0.01mm, straightness error ≤0.005mm/m, and surface roughness Ra ≤0.4μm. This ensures uniform force transmission during ejection, avoiding workpiece deformation or surface scratches. The rod end positioning structure (with precision threads or tapered fit) features 2A-grade accuracy, enabling seamless integration with the extrusion machine's hydraulic system.
3. Wear & High-Temperature Resistance, Extended Service Life: The surface undergoes ion nitriding or dual-alloy cladding treatment, resulting in a surface hardness of HRC 60-65—3 times higher wear resistance than ordinary steel. It can withstand erosion from high-temperature metal billets (up to 600℃) and abrasive plastic melts (including glass fiber-reinforced materials). For corrosive working conditions (e.g., acid-resistant plastic processing), 316L stainless steel variants provide excellent corrosion resistance, extending the service life by 2-4 times.
4. Customized Adaptability, Wide Compatibility: Supports customization of rod diameter (φ12-φ300mm), length (200-5000mm), and end configurations (threaded, flanged, tapered) based on extrusion machine models (100t-10000t class) and workpiece requirements. Compatible with hot extrusion (metal pipes/profiles), cold extrusion (precision parts), and plastic extrusion (film/pipes) processes, adapting to working temperatures of -20℃~600℃ and hydraulic system pressures ≤31.5MPa.
5. Fatigue-Resistant Design, Stable Operation: Optimized transition fillets and residual stress elimination via shot peening improve fatigue resistance by 45%. The fatigue life exceeds 1×10⁷ cycles, meeting the 24/7 continuous production demands of extrusion lines. This reduces equipment downtime and replacement costs by over 30% compared to standard ejector pins.

III. Key Technical Parameters

IV. Application Fields

• Metal Extrusion: Hot extrusion of large-diameter pipes (nuclear power/ocean engineering), cold extrusion of precision automotive parts, and profile extrusion (aluminum alloys);
• Plastic Processing: Extrusion of film, pipes, and profiles (including PVC, PA, and glass fiber-reinforced plastics);
• Powder Metallurgy: Compression molding of diamond tools and magnetic materials via powder extruders;
• Special Forming: Custom extrusion for geothermal well casings and aerospace structural components;
• Mold Systems: Integrated with injection molds for the ejection of complex plastic parts.

V. Quality Assurance

1. Raw Material Control: Sources from certified steel mills, providing material certificates, spectral analysis reports, and mechanical property test data. 100% spectral inspection and flaw detection are conducted before production;
2. Process Compliance: Adheres to the ISO 9001:2015 quality management system and GB/T 13927-2023 hydraulic component standards. Key processes (forging, heat treatment, grinding) are equipped with online monitoring systems for full-process traceability;
3. Finished Product Testing: Undergoes ultrasonic testing (UT) for internal defects, magnetic particle testing (MT) for surface cracks, and dimensional measurement via 3D coordinate measuring machines. Pressure resistance tests (1.5× working pressure) ensure no leakage or deformation;
4. Technical Services: Offers customized design (FEA structural simulation), on-site installation guidance, and maintenance support. Provides free troubleshooting during the 12-month warranty period and accepts customizations based on customer equipment drawings.