The Sizing Formula
Required pillar load = Clamping force × 1.2 (safety factor)
Number of pillars = Required load / Load per pillar
Load Capacity Reference
| Pillar Ø | Load (kN) |
|---|---|
| Ø20 | 25 kN |
| Ø30 | 50 kN |
| Ø40 | 80 kN |
| Ø50 | 120 kN |
Example Calculation
Mold: 400×400 mm, 300-ton clamping press.
Required load: 300 tons × 9.81 × 1.2 = 3,530 kN.
Using Ø40 pillars (80 kN each): 3,530 / 80 = 45 pillars... this seems wrong.
Important clarification: Support pillars don't carry the full clamping force — they carry only the portion transmitted through the ejector space. The majority of clamping force is transmitted directly through the mold plates. Typically, pillars need to support 5-15% of total clamping force.
Revised: 3,530 × 0.10 = 353 kN. Using Ø40: 353/80 = 5 pillars ✓