PRECAUTIONS FOLLOWED IN COLD WORKING

 PRECAUTIONS FOLLOWED IN
COLD WORKING

Cold working leads to crack formation and
propagation if performed in excess and it should therefore be avoided. Residual
stresses developed due to inhomogeneous deformation cause warping or distortion
when the part is released from the tooling and during subsequent machining.
Magnitude and distribution of residual stresses should therefore be controlled.
Orange-peel and stretcher strains are material related types of roughness
defects found on surfaces not touched by tooling. The former can be avoided by
using fine grained sheets and latter is minimized by temper rolling or
stretching the strip to prevent localized yielding.

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