Thinning In Sheet Metal Forming

For noncircular sheet metal parts the maximum diameter is sometimes used.

Thinning in sheet metal forming.

Thinning in material is the result of stretching metal in the forming process. Sheet metal thickness is an important aspect of deep drawing process design. There are material tests e g. Sheet metal is metal formed by an industrial process into thin flat pieces.

If you have accurate measurements you can have confidence in your results. A substantial fraction of all metals are produced as thin hot rolled strip or cold rolled sheet. At this point you have two measurements. Thinning during forming is often considered a failure criterion in the metal forming industry.

The coils are formed. This can also be visualized in the diagram. The more you flatten the material the larger the circle becomes and the thinner the cross section. Sheet metal is one of the fundamental forms used in metalworking and it can be cut and bent into a variety of shapes.

A real sheet will at some point crack during forming. The resulting strain state in the center of the specimen depends on its shape. It is believed that a critical amount of thinning takes place in a sheet metal before failure. Hydro forming cheap tooling no net thinning slow high formability material stretched into shape stretch forming very cheap tooling net thinning slow low formability super plastic forming cheap tooling net thinning expensive sheet metal slow very high formability technology a brief review forming speed 20.

In many manufacturing areas such as the automotive industry outer panels inner panels stiffeners etc the packaging industry petfood containers beverage cans etc and the household. An easy example of this would be to take a ball of playdo modeling clay and flatten it out on a table. Prediction of the deformation zone thickness is an important approach to control the thinning ratio. Sheet metal is available in flat pieces or coiled strips.

In this study varying widths of low carbon steel sheets were punch stretched under laboratory conditions. Thickness is represented by t and d b is the diameter of the blank. The nakajima test that have been developed specifically to represent the cracking behavior of sheet metal. An excessive thickness reducing ratio of the deformation zone in single point incremental forming of the metal sheet process has an important influence on the forming limit.

The percent thinning is calculated as t 100 s f s. This is then formed in secondary processes into automobiles domestic appliances building products aircraft food and drink cans and a host of other familiar products. Extremely thin sheets are considered foil or leaf and pieces thicker than 6 mm are considered plate steel or structural steel. Countless everyday objects are fabricated from sheet metal.