Pick the odd one out.

Concept:

Metal forming

• In metal forming, the material is deformed plastically to generate the shape of the desired product.
• The important property of a material in metal forming processes is plasticity.

Forming operations

Forming operations are those in which the shape of a metal piece is changed by plastic deformation.

The following are examples of some common forming techniques: 

• Forging
• Rolling
• Extrusion
• Drawing

Surface finishing processes

• The deformation is induced by an external force or stress, the magnitude of which must exceed the yield strength of the material.
• In a workshop, metal parts are manufactured by performing different operations in the lathe, shaping machines, milling machines, drilling machines, or grinding machines.
• In order to enhance the quality of the surfaces of these parts, several surface finishing processes are performed on them.
  1. Lapping
  2. Honing
  3. Superfinishing
  4. Polishing
  5. Buffing
  6. Scraping
  7. Electroplating
  8. Knurling

Important Points

In manufacturing, knurling is a finishing process used to create any combination of horizontal, vertical or crossing lines on the surface of a workpiece.