Cold Working Sheet Metal

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Cold working sheet metal.

Most of cold working processes are performed at room temperature. Cold rolling is often used commercially in order to produce sheet metal plates and bars. In the precision machining industry cold working processes can include thread rolling thread forming swaging crimping staking planishing and metal spinning. When a metal is cold rolled it is plastically deformed as it is forced between the two rolls.

In cold forming metal is formed at high speed and high pressure using tool steel or carbide dies. Since they are generally stronger and work harden more rapidly than the austenitic stainless steels the application of greater force is normally required to achieve the same amount of cold deformation. Metal is said to be cold worked if it is mechanically processed below the recrystallization temperature of the metal. The steel bars we machine are typically cold drawn cold worked.

The force exerted by rollers on the sheet reduces its thickness and increase the strength of the sheet. The haynes and hastelloy alloys can be readily formed into various configurations by cold working. Such processes are contrasted with hot working techniques like hot rolling forging welding etc. Cold work is defined as the plastic deformation of a metal below its re crystallization temperature.

Sheet metal cold working can be used to produce controlled surface finish. The process consists of a set of two or more rollers spaced closed together and the sheet or strip of metal is passed through them. In this method the shape changes but the volume of the metal remains constant. The cold working of the metal increases the hardness yield strength and tensile strength.

Meaning of cold working. Bending of sheet metal is another process for cold working which involves deforming metal over a work axis thereby creating a change in the geometry of the metal.