Conformado de metal en frio

Metal Shaping

When a metal is veered round, extruded or stretched to a temperature under the recrystallization the metal is worn out in cold. They work the majority of the metals in cold to temperature set though the reaction of formed in them causes an elevation of the temperature
The work in warm realized on the metal in plastic print, it refines the structure of grain whereas the work in cold distorts the grain and reduces a bit his size. The work in cold improves the resistance, the maquinabilidad,Accuracy dimensional and finished of surface of the metal.
 
Owed to that the oxidation is menar in it works in it fried sheets mas thin and tin-plates can be laminated better than couple it works in warmly.


Effects of the work in cold

 -The principal difference of the work in warms and I cool it is the temperature to which the process is realized. In the work in cold one works the material to temperature set, but the process as such causes warming for friction between the equipment and the piece, for what it is common that the work in cold reaches temperatures up to of 200 °C.

All the metals are crystalline for the nature and are done of grains of irregular form of several sizes. When one is employed at cold the resultant changes at the form of the material it brings with you it mark in the structure of grain. The structural changes produce fragmentations of the grain, movements of atoms and distortion of the mesh.

For the work in cold there are needed very much major pressures that in the work in it warms. Since the metal remains in a condition mas rigidly is not permanently deformed until the applied stresses have exceeded the elastic limit.

The quantity of work in cold that a metal supports depends especially on his ductility, while mas ductile it is the best metal one will be able to be employed at cold; The pure metals can support a major deformation that those who have given elements, due to the fact that the metals of alloy increase the trend and rapidity of the hardening.



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