Calculadora de Ajuste a Presión Gratis
Calcula la interferencia y la fuerza de inserción para ajustes a presión entre eje y agujero.
Interface Pressure
150.0 MPa
Interface Pressure vs Diametral Interference (delta)
Fórmula
## Press Fit (Interference Fit) Analysis A press fit creates a joint by assembling a slightly oversized shaft into a slightly undersized hole. ### Simplified Formula (solid shaft, same material) **p = delta E (1 - (d/D)^2) / d** where delta is the radial interference (diametral/2), d is shaft diameter, D is hub OD, and E is the elastic modulus. ### Assembly Force **F = pi d L p mu** where L is the engagement length and mu is the friction coefficient.
Ejemplo Resuelto
A 50 mm shaft pressed into a hub (OD=100 mm) with 0.05 mm diametral interference, 40 mm long, steel.
- 01k = (50/100)^2 = 0.25
- 021/(1-0.25) = 1.333
- 03p = 0.05 x 200,000 / (50 x 1.333) = 10,000 / 66.67 = 150 MPa
- 04F = pi x 50 x 40 x 150 x 0.15 / 1000 = 141.4 kN
Preguntas Frecuentes
What interference fits are standard?
ISO specifies H7/p6 for light press fits, H7/r6 for medium, and H7/s6 for heavy. The choice depends on required holding force, assembly method, and whether disassembly is needed.
Can I use heat to assist assembly?
Yes. Heating the hub expands the bore, allowing easy assembly. Alternatively, cooling the shaft with dry ice or liquid nitrogen shrinks it. This avoids the high forces and potential surface damage of mechanical pressing.
What if hub and shaft have different materials?
Use the full Lame equation with separate terms for each material, including their individual moduli and Poisson ratios. The simplified formula shown assumes the same material for both parts.
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