Sheet Metal Punching Operation

Sheet and plate generally refers to rolled metal with a high surface area.

Sheet metal punching operation.

It is a metal removal operation. It leaves a lean edge on the piece of metal is sheared or cut. As explained above punching operation removes scrap from the larger piece of sheet metal. And the punch is hit at the other end of the sheet producing a shearing effect.

In other words combination of punching operations modify existing blank sheet using metal removing operations. It is a cut in a straight line across a strip sheet or bar. As a result of punching a larger piece of sheet metal becomes the final product. Stretch forming is a sheet metal forming process in which the sheet metal is intentionally stretched and simultaneously bent to have the shape change.

Slugging is the operation of punching in which the punch is stopped as soon as the metal fracture is complete and metal is not removed but held in hole. This rubbing creates more friction and heat increasing the chances for galling. When a specially shaped punch is used to create multiple usable parts from a sheet of material the process is known as blanking. Sheet is held by jaws or drawbeads at both the ends and then stretched by punch such that the sheet is stressed above yield strength.

Press working operations or sheet metal operations. Pressworking a term referencing sheet metal operations in general involves the working of a sheet between two die. In pressworking the upper die is called a punch. In this operation a sheet metal workpiece is placed or kept between two dies from one end.

When punching a round hole the hole naturally collapses slightly after the punch tip penetrates the sheet. Therefore a larger piece of sheet metal is the final part. A straight punch can rub against the workpiece material throughout the stroke. Blanking is an operation of removing a piece of metal from a large sheet by punching with a predefine shaped punch.

The removed part is called blank and it is the useful part and rest sheet is scrap. This process is used to cut gears jewelry and complex parts. Sheet metal punching punching operation is a type of sheet metal cutting process where scrap material is removed from the larger pieces of sheet metal. Punching is often the cheapest method for creating holes in sheet materials in medium to high production volumes.

By shearing forces acting on the metal through the edges of the punch and die. Here punching operation and blanking operation comes under cutting or shearing operations whereas deep drawing and bending operations come under forming operations. In metal forging applications the work is often punched while hot and this is called hot punching.