Forging has a lot of benefits on the metal being shaped. The metal's strength and toughness are improved due to this process and the repeated hot working results in metal becoming denser and the flow lines to follow the shape of the final component. There are basically three different types forging methods to make a forged part:
Impression Die Forging
Metal is pressed between 2 dies (called tooling), which contain a profile of the desired component. Parts weighing a few ounces up to 60,000 pounds can be made using impression die forging. Some of the parts are forged cold.
In Cold forging, most of the work is done at temperatures up to 2300 degree Fahrenheit. However, a slight variation of this work is done cold. In cold forging, many processes are involved such as cold drawing, bending, cold heading, extrusions, coining to yield a different range of part shapes. Parts being cold forged are processed under different temperature range – from room temperature to a hundreds degree.
Open Die Forging
Work is done between flat dies with no profile is the dies. The key to this method is movement of the part being forged. Parts larger than 200,000 pounds and eighty feet in length can be pressed or hammered into a shape this way.
Seamless Rolled Ring Forging
This type of forging is usually performed by punching a small hole in a round, think piece of metal (forming a donut shape) and then rolling, squeezing or pounding (in some cases) the donut into a thin ring. The diameter of the ring can be from a few inches to thirty feet.