Product Overview
Tungsten Carbide Ejector Pins (WC Ejector Pins) are high-precision wear-resistant components widely used in plastic injection molds and semiconductor die bonding equipment. Made of premium WC-Co cemented carbide, these pins feature ultra-high hardness, excellent abrasion resistance, low thermal deformation and stable dimensional accuracy under long-term continuous operation. They effectively solve frequent wear, short service life and size deviation problems of traditional HSS ejector pins, especially suitable for glass-filled plastic molding and high-frequency chip ejection scenarios.
Key Features
- Superior Wear Resistance: Hardness up to HRA 91–93, 3–5 times longer service life than SKH51 high-speed steel pins
- High Dimensional Stability: Low thermal expansion, no deformation during high-temperature and high-frequency continuous work
- Ultra-precision Machining: Strict concentricity control, smooth mirror surface, no burrs, no damage to workpieces and chips
- Corrosion & Oxidation Resistant: Adaptable to various harsh mold and industrial working environments
- Customizable Structure: Available for straight pins, stepped pins, tapered tips and wafer die ejector pins
Technical Parameters
| Item | Specification |
|---|---|
| Material | WC-Co Tungsten Carbide |
| Cobalt Content | 6% – 10% |
| Hardness | HRA 91 – 93 |
| Density | ≈14.5 g/cm³ |
| Bending Strength | ≥2800 MPa |
| Diameter Range | φ0.3mm – φ10.0mm (custom available) |
| Length Range | 8mm – 100mm (custom available) |
| Tip Taper | 10° / 15° / Custom taper |
| Tip Radius | R12μm – R300μm |
| Tolerance | ±0.005mm |
| Concentricity | ≤0.01mm |
| Surface Roughness | Ra ≤ 0.2μm |
Application
- Plastic Injection Mold Industry: Eject pins for glass-filled reinforced plastics (PA66+GF, PPS, ABS+GF), effectively prevent pin wear and burrs
- Semiconductor Die Bonding: Precision die ejector pins for LED, IC and semiconductor wafer lifting, matched with ceramic suction nozzles
- Precision Molds & Automation Equipment: High-frequency continuous ejection and positioning scenarios
Carbide Pin vs HSS Pin
| Item | Tungsten Carbide Pin | SKH51 HSS Pin |
|---|---|---|
| Hardness | HRA 91–93 | HRC 58–62 |
| Wear Resistance | Excellent | Medium |
| Toughness | Medium (brittle against strong impact) | High |
| Service Life | 3–5 times longer | Normal |
| Best For | High-wear, high-frequency precision scenarios | General mold ejection |
