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Rough forming:

The balls are formed into rough spheres on cold heading, hot forging, or hot rolling machines.

 
   Flashing:

The balls are ground under pressure between rotating grooved cast iron plates to improve sphericity.
   Heat treatment:

The balls are through hardened by heating to 840 ℃ and quenching.
They are then tempered to remove excess stresses.
   Hard’ Grinding:

The hardened balls are then ground under pressure between a rotating grinding wheel and a stationary cast iron plate.
   Finish lapping:

The balls are carefully lapped to their final dimensions between grooved cast iron plates, one rotating and one stationary.
   Inspection:

Varies according to grade from 4% AQL for commercial grades to 100% electronic scan and crack detecting for high precision.

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