Assembly of Shrink-Fits

Heating temperature of shrink-fits

Shrink-fits are assembled by heating to temperatures where the expansion exceeds the interference. The necessary temperature change can be calculated as

dt = δ / α d_i (1)

where

dt = temperature difference (^oC, ^oF)

δ = diametric interference (mm, in)

α = coefficient of linear expansion (m/m^oK, in/in^oF)

d_i = initial diameter of hole before expansion (mm, in)

Diametric interference can be calculated as

δ = dt α d_i (2)

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