Drawn metal parts

Deep drawing 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. It is thus a shape transformation process with material retention. The process is considered "deep" drawing 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 (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 (wrinkles of the first order). 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 uses radial tension-tangential compression to shape the metal. This process transforms flat sheet metal, or blank, into a hollow vessel that may be cylindrical or box-shaped, with straight or tapered sides or a combination of straight, tapered and curved sides.

The vessel is then redrawn through a series of dies, reducing its diameter and increasing its length with minimal change to the wall thickness

DEEP DRAW METAL STAMPING PROCESS

Step 1: Determine Scope

Deep drawn metal stampings up to 12” long (200mm) and from 0.008” (.127mm) to 0.180” (4.5mm) thick.

Step 2: Cutting Blanks

All deep drawn components start as a flat disc of sheet metal, blanked from coiled stock. Material utilization by staggering our blanks to reduce web scrap and cut costs. The deep draw stamping process minimizes waste, meaning your parts are made with the minimum amount of material required and you aren’t wasting money on metal that gets tossed in the scrap bin.

Step 3: Starting Cup

After cutting the blank at the first die station, the blank is cupped around the nose of a punch and pressed into a die to form a cup. This first deep drawing operation increases the strength of the part through work hardening.

Step 4: Keep Drawing

Depending on your desired length-to-diameter ratio will design tooling with several draws to create the basic shape of the part. The forces produced in the metal stamping process naturally cause the shell wall to thin out, while the shell flange thickens at each stage. Our team designs tooling to stretch the metal as evenly as possible into the part’s intended shape.

Step 5: Custom Features

Produces highly customized deep drawn parts for our customers. We utilize in-die stations to manufacture a variety of features:Bottom piercing Multiple side piercingExtrudingEmbossingMarkingBurnishingIroningChamferingFlange forming Shaped flange trimming Beading Reverse drawing Rib forming Coining