Thinning In Sheet Metal Forming

At this point you have two measurements.

Thinning in sheet metal forming.

Thickness to diameter ratio is a main factor used to quantify the geometry of a blank and can be calculated by t d b. Thickness is represented by t and d b is the diameter of the blank. Extremely thin sheets are considered foil or leaf and pieces thicker than 6 mm are considered plate steel or structural steel. Sheet metal is metal formed by an industrial process into thin flat pieces.

The nakajima test that have been developed specifically to represent the cracking behavior of sheet metal. An easy example of this would be to take a ball of playdo modeling clay and flatten it out on a table. In this study varying widths of low carbon steel sheets were punch stretched under laboratory conditions. Sheet metal is one of the fundamental forms used in metalworking and it can be cut and bent into a variety of shapes.

Thinning during forming is often considered a failure criterion in the metal forming industry. 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. Thicknesses can vary significantly.

A substantial fraction of all metals are produced as thin hot rolled strip or cold rolled sheet. The resulting strain state in the center of the specimen depends on its shape. Sheet metal thickness is an important aspect of deep drawing process design. The starting thickness of your sheet metal call that s and the formed thickness of your part at the location of interest call that f.

Thinning in material is the result of stretching metal in the forming process. The more you flatten the material the larger the circle becomes and the thinner the cross section. The coils are formed. Prediction of the deformation zone thickness is an important approach to control the thinning ratio.

A real sheet will at some point crack during forming. 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. 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. For noncircular sheet metal parts the maximum diameter is sometimes used.

Countless everyday objects are fabricated from sheet metal. There are material tests e g. This can also be visualized in the diagram. Sheet metal is available in flat pieces or coiled strips.