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Metal drawing: from sheet metal to three-dimensional elements


The working process known as “deep drawing” is part of the cold deformation of metals. By means of deep-drawing operations it is possible to deform a metal sheet without resorting to activities carried out at high temperature (such as casting) and without altering the thickness of the sheet.

But what enables us to achieve deep drawing?

In deep drawing operations, two types of deformation are applied simultaneously: elongation and compression. This coordinated action, which is carried out using a progressive die or a transfer die, makes it possible to transform a flat sheet metal into three-dimensional hollow elements, such as cylinders, cups or caps. This process is particularly advantageous because it gives the possibility to obtain finished elements in a single piece, without joints. A feature that clearly improves the aesthetic quality of the piece, making it free of wrinkles or countersinks.

The drawing process begins with the design and production of the specific die for the shape to be obtained. In this preliminary phase, great importance at Prodotti EBI is given to the preliminary feasibility study: it is thanks to this in-depth analysis that we can foresee possible criticalities and find an adequate solution before starting production. The next stage in the production process is for the sheet metal to pass between the punch and the die: here, the deforming force of the hydraulic presses acts in such a way as to obtain the desired shape.

Deep drawing: peculiarities and differences compared to “simple” drawing

If the design of the pieces to be deep-drawn involves great depths, we can speak of deep drawing. Specifically, this attribution is made in all cases where the depth of the concave piece is greater than its width. It is with this type of operation that we obtain particularly deep metal components, some of which are ready to be placed on the market while others are destined to undergo further processing.

Deep drawing produces pieces that are very strong, reliable and completely seamless: since, as we have seen previously, the metal component is formed from a single sheet of metal, this means that the values of strength and resistance to stress and pressure are considerably higher.

Not only deep drawing: bending, blanking and welding

Whether components are obtained from simple or deep drawing operations, all shapes can undergo further treatments to obtain the finished piece. From bending and shearing (to make holes and notches and shape the edge of the material) to welding (to put two or more elements together), all subsequent processes are carried out with the aim of obtaining the designed shape precisely.

Automotive metal finished products with Prodotti EBI

In the automotive sector, many components are made through deep drawing processes, especially in the current market oriented towards increasingly high performance and lighter machines.Would you like to find out which automotive components we make in Prodotti EBI? Contact us!