SMLease Design

Mechanical Product Design & Development Partner

Sheet Metal Cutting Operations - SMLease Design

Sheet metal Cutting Operation involves the separation of the metal of the sheet in certain areas. This separation is caused by shearing forces acting on the metal through the edges of the punch and die.

You can Contact Us for Sheet Metal Design & Manufacturing Support.

Sheet Metal Cutting Operations:

Shearing Operation

Cutting process that produces straight line cuts to separate a piece of sheet metal. Shearing is used to cut a sheet parallel or at any angle to an existing edge which is held square. Shearing is primarily used to cut sheet stocks into smaller sizes in preparation for other processes.


Blanking is a cutting process in which a piece of sheet metal is removed from a larger piece of stock by applying a great enough shearing force, the piece removed, called the Blank, is not scrap but rather the desired part.


Punching is a cutting process in which material is removed from a piece of sheet metal by applying a shearing force. Punching is very similar to blanking except that the removed material, called the slug, is scrap and leaves behind the desired internal feature in the sheet, such as a hole or slot. Punching can be used to produce holes and cutouts of various shapes and sizes. Secondary finishing operations are typically performed to attain smoother edges.

Different Types of Punching Operations


Punching operation in which a cylindrical tool makes a round hole in sheet.


Punching operation in which a rectangular tool makes a rectangular slot in sheet.


                  Lancing is a punching operation in which the work piece is sheared and bent with one strike of the die. A key part of this process is that there is not reduction of material, only a modification in its geometry. Creating a partial cut in the sheet, so that no material is removed. The material is left attached to be bent and form a shape, this operation is used to make tabs, vents, and louvers.

Normally lancing is done on a mechanical press, lancing requires the use of punches and dies to be used. The different punches and dies determine the shape and angle (or curvature) of the newly made section of the material. The dies and punches are needed to be made of tool steel to withstand the repetitious nature of the procedure.


The nibbling process cuts a contour by a series of overlapping punches. Complex shapes can be formed in sheet metal using simple tools (round or rectangular punches) with nibbling process.

E.g. with the series of punches of small diameter (2mm) we can make round hole of bigger diameter (20 mm or more than that)

 The process is used where making dedicated blanking die cannot be justified due to less quantity. The edge smoothness is determined by the shape of the cutting die and the cuts overlap; the more the cuts overlap the cleaner the edge.


Perforating is a piercing/punching operation that involves punching a large number of closely spaced holes.


Notching is a piercing operation that removes material from the edge of the work piece.


The trimming operation is the last operation performed because it cuts away excess or unwanted irregular features from the work piece.


Deburring process is a finishing operation where a small amount of metal is removed away from an already blanked part to remove all sharp edges and corners and make the blank smooth.

You can Contact Us for Sheet Metal Design & Manufacturing Support.

Related Posts


Go Back



Latest Posts

Page Counter