Metal forging and hot forming are excellent induction heating applications. Industrial forging and hot forming processes involve bending or shaping a metal billet or bloom after it has been heated to a temperature at which its resistance to deformation is weak. Blocks of non-ferrous materials can also be used.
Induction heating machines or conventional furnaces are used for the initial heating process. Billets can be transported through the inductor via a pneumatic or hydraulic pusher; pinch roller drive; tractor drive; or walking beam. Non-contact pyrometers are used to measure the billet temperature.
Other machines such as mechanical impact presses, bending machines, and hydraulic extrusion presses are used to bend or shape the metal.
The approximate hot forming temperatures of the most commonly used industrial materials are:
• Steel 1200º C • Brass 750º C • Aluminium 550º C
Induction heating machines are commonly used to heat steel billets, bars, brass blocks, and titanium blocks to the proper temperature for forging and hot forming.
Induction heating is also used to heat parts such as pipe ends, axle ends, automotive parts, and bar ends for partial forming and forging processes.
When compared to conventional furnaces, induction heating machines for forging offer significant process and quality advantages: