A specialized mechanical forging machine that grips a heated bar and strikes it axially with a heading tool. This process, called upsetting, gathers the metal to increase the cross-section at the end of the stock. It is heavily used in mass production to forge bolt heads, engine valves, flanges, and axle shafts without folding or buckling the grain structure.
Heard on the job
Heat the end of that bar and put it in the upsetter to form the flange before we drop-forge the rest.
Also heard as
- upset forging machine
- header