For those who are not familiar with the term, deep drawing is a manufacturing process that implies drawing a sheet metal blank into a forming die. This procedure is done with the aid of the mechanical or hydraulic action of a press. The flat sheet of metal turns into a three dimensional object after it is drawn into that specific shape by the punch.
It is important to know that there are two different types of drawing. The one that is called deep implies for the depth of the drawn part to be bigger than the part diameter. The other type of drawing is called shallow, and it is the opposite of the one previously mentioned, in the sense that the depth of the drawn part is less than its diameter.
The process of deep drawing is quite a complex one. The flat sheet of metal that comes out of the blanking process goes through the cup operation first. This means that sheet of metal is put under the press action of the hold-down sleeve in order to prevent the blank from wrinkling, while the draw punch applies another press action on the blank, thus forcing it to take the shape of the die. Then, a knock-up pin ejects the newly formed part. The transfer slide takes the part to the next step in this process.
There are other several stages that the drawn part goes through until it reaches its final form. The next one after the cup operation is the first draw. During this stage, the diameter of the cup is reduced. The second draw implies not only reducing the diameter of the cup even more, but also lengthening the part. The final draw stage is necessary to bring the part to the inside and outside dimensions that the manufacturer desires. After undergoing the final draw, the part has to go through the pierce stage. This implies that the bottom of the part (which is now in a tubular shape) is punched out and then the slug is extracted. The final stage of this entire process is represented by the clip stage, where the uneven edges are removed.
It is worth mentioning that there is a wide variety of both ferrous and nonferrous materials that can undergo the procedure of deep drawn enclosures and aluminium, brass, stainless steel and cold-rolled steel are only some examples. However, for each of these metals a different drawing force is required. The material which the dies and punches are made of is usually tool steel. Even though carbon steel is a cheaper alternative, this material is not as hard as the previous one.
One of the many benefits of deep draw manufacturing is that it provides rapid press times. The fact that through this process people can manufacture large quantities of various metal components in a short time is definitely a great advantage.
If you are interested in a company that provides such metal components, you should do some research on the internet. It is recommended to work only with professional and reputable companies from this industry in order to benefit from the best results.
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