Hot working

With hot stamping those forming steps are referred to, which take place above the recrystallization temperature of a metal. The effluent during the strain hardening is accompanied by during and after the forming step running recreational and Entfestigungsprozesse. This allows very high degrees of deformation applied. It is not essential that the material is heated. In many metals, the recrystallization is already at room temperature (standard value recrystallization temperature > 0.6 x melting temperature in K).

Method of hot forming can be, among others:

• Forge
• Hot rolling
• Extrude

Comparisons of hot and cold forming

Hot forming

• Working temperature above the recrystallization
• Large formability of the materials
• Low deformation forces
• Slight change of strength and elongation at break on the reshaped material
• Dimensional tolerances and surface finish worse than in cold forming
• Can generate anisotropy
• Causes no solidification

Cold forming

• Working temperature below the recrystallization temperature
• Tight tolerances possible
• No descaling the surface
• Increase the strength and reduce the elongation at break ( hardening )

By cold forming the structure of the material used is so affected that eg the welding processing of this component can not be guaranteed. By annealing the voltage from the cold-formed workpiece can be its original weldability meet again.

• Metal processing
• Transform