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 Secondary Operations at Atlas are value-added processes available to PM manufactured components.

Secondary Operation Typical Parts Objectives

Repressing 

Coining   All 

Densification, dimensional control.

Sizing All 

Dimensional control. 

Impregnation

Oil Bearings

Make bearing self-lubricating.

Resin  Structural

Improve machinability. Prepare surface for plating with other metals. Seal parts gas or liquid tight.

Infiltration

Infiltration Ferrous Structural

Improve machinability. Prepare surface for plating with other metals. Seal parts gas or liquid tight. Infiltration Improve strength up to three times. Seal parts gas or liquid tight. Prepare surface for plating with other metals. Improve ductility and machinability.

Heat Treating

Quench and Temper Ferrous Structural

Improve strength and hardness.

Steam Treat Ferrous

Make surface hard and wear resistant. Improve corrosion resistance and seal porosity. 

Machining

Drill and Tap 

All To install set or assembly screws.  

Turning 

All Machine to exact tolerances. Form undercuts not possible with punch and die tooling.

Milling 

All Form undercuts or slots.

Grinding 

All Remove stock, make faces parallel, and improve surface finish and tolerances. 

Honing

All Improved dimensional control.

Finishing

 Deburring 

All Remove sharp edges related to punch and die tooling.

Burnishing 

Ferrous Structural Ball size, roller burnish for size control and surface finish.

Coating Oil Dip 

Ferrous Corrosion resistance.

Copper, Nickel Zinc Plating 

Ferrous Corrosion resistance, appearance.

Welding 

Ferrous, 6.8 g/cm min. density Makes assemblies from two or more parts. 

Black Oxide 

Ferrous, resin impregnated  Corrosion resistance, paint base.

Mechanical Surface Treatments: Glass Beading Wire Brush, Sanding

All Clean, improve surface.

Coating

Structurals High corrosion resistance.

Tumbling/ Vibratory Finishing,
Grit Blasting

Ferrous, Forgings Improve surface fatigue life.