Basically, cold forging process entails bar stock to be inserted into a die and then squeezed with a second closed die. Similar to the cold heading process (the difference that cold forging makes use of vertical presses instead of horizontal cold heading machines), the work piece is squeezed between two dies until it assumes the desired shape of the die.
Deformation occurs at room temperature, causing a change in the size and shape of the metal. Note here that this forging method is volume specific and generally compliments the cold heading processes by adding more intricate shapes to the blank used in cold heading processes.
Basic equipment types used for the forging method range to include vertical presses, either fully automatic or manually fed. Also note that these vertical presses used can be either hydraulically powered or mechanically powered.
A reliable and cost effective process, some of the parts produced using cold forging includes those for use in the automotive electrical industry and range to include:
- Parts for car seats and alternators (such as the claw-pole)
- Different types of gears used on other parts
- Parts for starter motors such as transmission solenoid body, core and plunger, to name but a few examples)
- Motorcycle parts such as those for flywheel magnetos
- Parts that are hollow with shafts and stems
- Parts used for valves and switches
- Cold forging is also used to produce anti-vibration spiders and parts