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Views: 0 Author: Site Editor Publish Time: 2025-01-28 Origin: Site
Ejector pins should be located 10–15 mm away from the edge of the molded part.
The position is controlled by the ejector retainer plate, ensuring precise alignment and travel.
| Ejection Type | Application Notes |
|---|---|
| 1. Pin Ejector | Most common; used for flat and general surfaces |
| 2. Blade Ejector | For long, thin ribs or narrow slots |
| 3. Ejector Sleeve | Used with round cores, like bosses or posts |
| 4. Stripper Bar Ejector | Suited for large-area parts with uniform ejection |
| 5. Stripper Plate Ejector | Ideal for deep or flexible parts needing uniform ejection |
| 6. Lifter | For undercuts and angled surfaces |
| 7. Air Ejector | Used for lightweight or delicate parts to avoid marks |
The part should be ejected:
Evenly
Without deformation or marks
Without breakage
Key areas needing support during ejection include:
Walls
Ribs
Holes
Bars (rods, bosses, etc.)
Where draft angles are shallow, use standstill locks (e.g., texture or undercut catches).
Where draft angles are steep, add anti-slip (skid-proof) stripes to prevent slippage.
| Design Factor | Recommendation |
|---|---|
| Pin height | Level with or 0.2 mm higher than parting surface |
| Distance from parting surface | At least 1 mm (standard); If part height >30 mm → ≥2 mm If part height >60 mm → ≥3 mm |
| Spacing | Intervals between ejector pins should be uniform and logically distributed |
| Pin-to-plate clearance | Set 0.5 mm gap between ejector pin and both ejector plate & B plate |
| Clearance (parting surface to pin location) | - 20 mm for small molds - 30 mm for medium molds - 35 mm for large molds |
✅ Tip: Always prefer more ejector pins over fewer; larger pins over smaller ones when part layout permits.
