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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