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Press Operations | DIVENCE

At Divence, when Sheet Metal Components are manufactured with every required manufacturing processes, its important to know how it is done and what are the notations & names for it. The several press operations are performed on the sheet metal sheet, strip or blank, after this the finishing, heat treatment, coating and assemblies are done.


The first question comes in mind that What Is Power Press?


It is a machine tool that changes the shape of workpiece by application of pressure. And for this the die tools are used as per the required shape of workpiece.


How Operations on Press are classified..?

The operations performed on Power Press are used to manufacture parts/components from Sheet Metals, with use of particular Die Tools. The Press Operations are generally classified as :

  1. Cutting Operations

  2. Forming Operations

The following video shows the detailed classifications of Sheet Metal operations done on press.



1. Blanking

Blanking is the operation of cutting a flat shape from sheet metal. The article punched out is called the 'blank' and is the required product of the operation. The hole and metal left behind is discarded as waste.


2. Punching (Piercing)

It is cutting operation by which various shaped holes are made in sheet metal. Punching is similar to blanking except that in punching, the hole is the desired product, the material punched out to form the hole being waste.

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3. Notching

This is cutting operation by which metal pieces are cut from the edge of sheet, strip or blank.


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4. Perforating

This is process by which multiple holes which are very small and close together are cut in flat work material.


5. Slitting

It refers to the operation of making incomplete holes in a workpiece.

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6. Nibbling

The nibbling operation which is used for only small quantities of components, is designed for cutting out flat parts from sheet metal. The flat parts range from simple to complex contours. This operation is generally substituted for blanking. The part is usually moved and guided by hand as the continuously operating punch cuts away at the edge of the desired contour.


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7. Lancing

This is a cutting in which a hole is partially cut and then one side is bent down to form a sort of tab or louver. Since no metal is actually removed, there will be no scrap.

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8. Bending

I this operation, the material in the form of flat sheet or strip, is uniformly strained around a linear axis which lies in the neutral plane and perpendicular to the length wise direction of the sheet or metal.

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9. Drawing

This is a process of forming a flat workpiece into a hollow shape by means of punch which causes the blank to flow into a die cavity.

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10. Trimming

The operation consist of cutting unwanted excess material from the periphery of a previously formed component.


11. Shaving

The edges of blanked part are generally rough, uneven and unsquare. Accurate dimensions of the part are obtained by removing a thin strip of metal along the edges. The operation is termed as Shaving.


12. Squeezing

Under this operation, the metal is caused to flow to all portions of die cavity under the action of compressive forces.



Source : A Textbook of Production Engineering - PC Sharma