Solving Problems with Chemicals

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Metal Forming : Defination & Process

Metal Forming -- A manufacturing process in metallurgy field where metal components are formed; involving plastic deformation of a metal piece to produce a desired metal part with an useful / functional shape.

However, many people may be more familiar with the term ' metal stamping '.



The fabricated parts may be made from single or combination of the following basic processes :

1. Cutting - punching and blanking

Punching
- A part is cut from a metal sheet and scraped,  and the remainder is retained as finished part which may undergo further working processes.

Blanking
- A cutting process similar to punching, but the cut portion ( the blank ) is retained as useful part.
- The blank may or may not receive further working processes to produce a finished part.



Note :  For ordinary punching / blanking, the edges of the finished part could have a relatively rough surface. In other words, approximately  30% of the metal sheet depth is cleanly cut whereas the remainder is fractured.

Fine Blanking
- Similar to blanking process, however, the part is produced with finer surface finish, closer tolerance, and greater precision with nearly 100% clean cut.
- This process involves a work piece being clamped onto the die by a ring plate, and supported by a counter punch from underneath during stampimg process.
- The punched part will be completely clean-cut, with minimal or no twisting thus improving the dimensional accuracy



2. Drawing - bending or forming of metal sheets
- A process involves  " plastic flow " of a flat metal sheet  shaping into a cup shape component.

- It is performed by placing a blank with precut size over a shaped die with a punch.

Note :   When the depth of the draw  is greater than half diameter of the cup shaped component, this is categorised  as deep drawing


3. Coining
- A part is squeezed or compressed to change and follow the die's surface form.