SHEET METAL FORMING PROCESS / PRESS WORKING

OF SHEET METALS

Press working also termed as Cold stamping.

• Presses

– In sheet metal working it is a machine

tool with a bed (die) and powered ram

(punch) that can be driven toward and

away from the frame to perform various

cutting and forming operations

PRESS OPERATIONS

Cutting operations

• Blanking• Punching

( Piercing)• Notching • Perforating• Shaving• Trimming

• Slitting• Lancing• Nibbling• Forming operations• Bending• Drawing• Squeezing

BLANKING • It is the operation of cutting a flat shape

from the sheet metal in single step

Punching / Piercing• It is the operations by which holes are

produced

Notching– It is a cutting operation by which metal pieces are cut from the edges

Perforating– It is the operation by which multiple small holes are cut in a sheet metal

Slitting– It is the operation of making incomplete hole

Lancing–It is the operation in which the hole is partially cut and then one side is bent down to form a sort of tab or louvers

Lancing

Trimming– It’s a operation of cutting unwanted excess material.

Shaving

The uneven surfaces along the edges are removed by this operation

• Dies– Types

• Simple- single operation with a single stroke• Compound- two operations with a single stroke• Combination- two operations (cutting & forming)• Progressive- two or more operations at two or

more stations with each press stroke, creates what is called a strip development

• Transfer dies • Multiple or gang die

Progressive Dies