Sheet Metal Drawing Operation

The punch die clearance is slightly larger than the thickness of the sheet metal to be deep drawn.

Sheet metal drawing operation. Deep drawing force calculator calculate the required force to deep draw a piece of sheet metal based on the drawing ratio sheet thickness and the ultimate tensile strength of the material. Drawing is a metalworking process which uses tensile forces to stretch metal glass or plastic as the metal is drawn pulled it stretches thinner into a desired shape and thickness. Both of these forming operations are explained below. Sheet metal drawing and wire bar and tube drawing.

Mainly sheet metal process can be divided into three types. 3 february 6 2012 drawing 4 february 6 2012 fig. Sheet bending sheet bending is defined as the straining of the metal around a straight axis. Drawing tools nageswara rao posinasetti 1 february 6 2012 2 february 6 2012 sheet metal operations drawing is the process of making cups shells and similar articles from metal blanks.

The drawing ratio is a measure of the severity of the drawing operation and is the ratio of the initial blank diameter to the punch diameter. As mentioned the punch and die setup is somewhat similar to a sheet metal cutting operation such as punching or blanking. Drawing is classified in two types. It is a sheet metal forming process in which a sheet metal blank is radially drawn into a forming die by the mechanical action of a punch.

As the load applied through the punch the sheet metal is forced to flow radially and sink into the die cavity to form a cup. Bending of tube stock. Typical tools used for drawing are shown. The process of deep drawing is shown in fig.

Bending causes no change in the thickness of the sheet metal. During bending operation the metal on the inner side of the neutral plane is compressed and the metal on the outer side of the neutral plane is stretched. The process is best suitable for complex shaped problems. It is a cut in a straight line across a strip sheet or bar.

The specific definition for sheet metal drawing is that it involves plastic deformation over a curved axis. It leaves a lean edge on the piece of metal is sheared or cut. In this operation a sheet metal workpiece is placed or kept between two dies from one end. Introduction cutting and forming thin sheets of metal usually performed as cold working sheet metal 0 4 1 64 to 6 mm 1 4in thick.

Two main factors will cause the punch in deep drawing to draw the metal into the die cavity rather than shearing it.