It is a process in which we rub the metal surface with a hard tool by applying sufficient pressure. This leads to the plastic deformation of the surface materials which flattens the metal surface. This process produces a good surface finish. It can produce a surface finish of 0.05 to 0.2 μ R_a in one pass at a feed rate of 1500-3000 mm/minute.

Types of burnishing tools:

·          Internal diameter burnishing tool.

·          External diameter burnishing tool.

·          Taper burnishing tool.

·          Face burnishing tool.

Advantages of burnishing:

·          Finer finish in one pass.

·          Improved sizing.

·          Attachable to any standard machine tool.

·          Longer tool life.

·          No operator skill is required

·          Reduced noise level.

·          Faster production rate.