Thermal deformation of workpieces

The characteristic distribution of the heat flux cutting, for example, when turning is: chips-60-80%; RI - 10-14%; blank - 3-9%; external environment-1%. When drilling the nature of the other: chips - 28%; drill - 15%; blank - 50-55%; environment - 3%.

Thus, of the workpiece during heat up significantly. Their deformation (error) depend on the size and weight, the coefficients of linear expansion.

Small workpieces are very rapidly reach temperature equilibrium. Procurement of a large mass during the treatment process may never reach a stationary regime and then the temperature factor is manifested to a greater extent (especially in draft modes). This implies that finishing should not be performed after roughing (justification of the principle of superposition etc.).