What is Deep Draw?

Deep Drawing process

Deep drawing is a process in sheet metal forming by the mechanical action of a punch. A flat sheet metal blank is formed over a single, rigid, shape defning tool half by a flexible rubber diaphragm under uniform hydrostatic pressure.

The process results in scratch-free parts regardless of the sheet thickness or complexity of the tool, including undercuts. High forming pressure ensures close tolerance parts direct from the press with little or no secondary hand work required.

The process is considered deep when the depth of the drawn part exceeds its diameter. This is achieved by redrawing the part through a series of dies.

The flange region, the sheet metal in the die shoulder area, experiences a radial drawing stress and a tangential compressive stress due to the material retention property.

These compressive stresses, hoop stresses, result in flange wrinkles. These wrinkles can be prevented by using a blank holder, the function of which is to facilitate controlled material flow into the die radius.

Deep Drawing of Sheet Metal Parts

The QUINTUS® Deep Draw Presses are the most versatile of the Quintus Flexform presses in terms of forming capabilities. Not only can they form the same kind of parts as Flexform fluid cell presses, but also complex and deep parts which require a deep drawing function. This is performed with the rigid tool half – a movable punch and blank holder – and by controlling the forming pressure as a function of the draw depth. The circular Flexform unit contains the flexible rubber diaphragm.

Flexform high pressure technology has been used for decades by such industry leaders as Airbus, Boeing, British Aerospace, Bombardier, Cessna, Daimler, Embraer, Ford, Lockheed, Volvo and many, many others. Users report shorter part lead times, significantly lower tooling costs (one piece instead of three), fast prototyping, and easy tool modification after component design changes.

The Flexform concept is simple: sheet metal blanks are formed over a single, rigid, shape defining tool half by a flexible rubber diaphragm under uniform hydrostatic pressure. The process results in scratch-free parts regardless of the sheet thickness or complexity of the tool, including undercuts. High forming pressure ensures close tolerance parts direct from the press with little or no secondary hand work required.

Watch video: Deep Draw Hydroforming animation


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