—- Deep Draw Metal Stamping Fundamentals

Let’s look at the different stations that we can have in the press and their functions. As mentioned previously, the first station is the blanking station. The blank is pierced out of the metal strip and then forced down to the transfer slide which moves the blank to the next station. The second station is called the cupping station. This is where the blank is first reduced. The reduction of the blank should not be any more than 45% of the blanks diameter which will avoid any tearing of the material. Following the second station or cupping station are a series of deep drawing stations. Depending on the press it is common to have up to 12 to 15 stations to form a finished part.

In order to have varying diameters in a part you would need to use a step draw. This type of draw can also produce different shaped diameters as well. Other common operations in these stations are sidewall shaping, reverse drawing, bulging, curling, threading, and beading, bumping and trimming.

Deep drawn metal stampings have basic dimensional characteristics. The first of these would be in regard to material thickness. The bottom of the shell tends to remain the same thickness as the original starting material since this area is not affected by the draw process. This area does not see a change in temper as well since it is not being worked unless it is being coined or flattened.

The bottom wall will tend to thin from the original thickness due to the stretching of the material. The wall at the top is usually thinner than the original stock due to the effect of the draw process. This area is somewhat hardened as well due to the working of the material.

In order to obtain a uniformed wall, pinching or ironing is performed. This is done by limiting the clearance between the punch and die. This is easily accomplished with non-ferrous material but is likely impossible with stainless steel.

Accurate Forming is a Deep Draw Metal Stamper who was established in 1955. All of Accurate Forming’s operations take place in our 70,000 square foot facility located in Hamburg, NJ. Accurate Forming manufactures cylindrical shaped parts using transfer press technology. The size range for these parts ranges from .700” in length with a diameter of 1.562” all the way to 5.44” in length with a .400” diameter. Material thicknesses range from .007” thick up to .062” thick. Materials that are used in the deep draw manufacturing process are aluminum, cold rolled steel, pre-plated crs, stainless steel, copper, brass and other precious metal alloys.

Please contact Accurate Forming at (973)827-7155 or at [email protected] or visit our website at www.accurateforming.com to learn more about what Accurate Forming can do for you.