What Is Metal Stamping?

Metal stamping is an industrial process, that relies on machinery fitted with dies to create shapes from metal sheets. Metal presses can punch, emboss, tool, blank, notch, and coin sheet materials.

It can be confusing trying to determine the most appropriate process of stamping. When selecting the metal stamping process, you should notice:

  • The design or industry specific requirements
  • How the process impacts the design functionality
  • Production time
  • Cost effectiveness

Blanking

It is a shearing process, where a punch and a die are used to modify webs. The metal workpiece is removed from the primary metal strip when it is punched. The material which is removed is the new metal workpiece or blank.

It is also used to cut large sheets of metal into smaller or manageable pieces.

Metals that can be fine blanked include:

  • Copper
  • Stainless steel
  • Aluminium
  • Brass

Piercing

It is a shearing process where the die and punch are used to create a slot, hole or other type of cutout in a metal sheet. The machinery and the process of piercing is the same as blanking. Except, in the piercing process the piece being punched out is scrapped.

While manufacturing a part, this forging technique is often performed as an additional process at the same time as other forging processes. Piercing does not break through the metal surface like a drilling operation.

Piercing is similar to other metal forging processes, it will change the work material properties and it directly affects the part’s grain structure.

Drawing

A punch forces a metal section through a die, providing the primary shape of the part. When the depth of the part is smaller than the primary opening, it is considered shallow drawing. However if the part is larger than the opening, then it is known as deep drawn.

The metal is drawn, it stretches thinner, into a shape. Basically, it is classified into 2 types

  • Sheet metal drawing
  • Tube, Wire, and bar drawing

Drawing is usually performed at room temperature and is classified as a cold working process, but it can be performed at elevated temperatures.

Bending

It is a manufacturing process that offers a U-shape or V-shape, along a straight axis in ductile materials. Usually bending is performed after the drawing process, attempting to punch an existing bent piece causes the whole part to deform.

3 types of bending are available,

  • Air bending
  • Bottoming
  • Coining

Air bending

It forms the bend by pressing a punch into the material. This forces it into the bottom v-die that is already mounted on the press. Therefore, the punch forms the bend. So that the distance between the punch and the side wall of the V is higher than the material thickness.

Bottoming

In this process, the sheet is forced against the V opening in the bottom of the tool. You can see the space between sheet and v opening in the bottom. The advantage of this method is greater accuracy and less springback.

Coining

In this processes, the top tool forces the material into the bottom die,. Because this uses five to thirty times the force of air bending, this causes permanent deformation through the sheet. Coining tends to require a higher tonnage press than stamping.

More Information

There are other techniques that are involved in the stamping process. However not all the processes are required for the production of each component. With our clear cut understanding of the processes. We are able to design parts to create cost savings, minimise the scrap, and maximise the production speed.

Who We Are

UK Pressings – is a manufacturer of metal stamping since 1978. With 40 years’ experience, the company has a dedicated engineering team offering a range of materials used in metal presswork. We produce high quality, full tooling solutions which are flexible and cost effective.

 

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