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Free forging

Definition of free forging Free forging is the use of impact force or pressure on the metal between the top and bottom of the anvil free form in all directions, without any restrictions to obtain the desired shape, size and certain mechanical properties of the forging method.

Free forging equipment

The equipment of free forging can be divided into two categories: forging hammer and hydraulic press. The hammer used in production is air hammer and steam air hammer. Hydraulic press is the only way to produce large forgings by using static pressure generated by liquid to deform the blank.

Basic process of free forging

Rough upsetting is a forging process which makes the cross section of billet larger and the height smaller. There are two kinds of upsetting: integral upsetting and partial upsetting. Drawing and drawing is the opposite of upsetting. It is a forging process to increase the length of the billet and reduce the cross section. The punching process of punching holes or blind holes on billets is called punching. The characteristics of free forging and the application of free forging depend on manual operation to control the shape and size of forgings. Therefore, the forgings have low precision, large machining allowance, high labor intensity and low productivity. Therefore, it is mainly used in single-piece and small-batch production with simple structure and shape of forgings.

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    • By Erica Zhu Feilong Jiangli
      Free forging is a kind of forging method which uses impact force or pressure to make the metal form freely in all directions between the top and bottom of the anvil surface without any restriction to obtain the required shape, size and certain mechanical properties of the forging.
      The equipment of free forging can be divided into two categories: forging hammer and hydraulic press. The hammer used in production is air hammer and steam air hammer. Hydraulic press is the only way to produce large forgings by using the static pressure generated by liquid to deform the blank.
      Basic process of free forging
      (1) The upsetting-one upsetting is a forging process which makes the cross-section of blank larger and the height smaller. There are two kinds of upsetting: integral upsetting and partial upsetting. (2) Drawing-drawing is contrary to upsetting, and is a forging process which makes the length of blank increase and the cross section decrease.
      (3) The punching process of punching holes or blind holes on billets.
      Characteristics and application of free forging
      Free forging is to control the shape and size of forgings by manual operation, so the forgings have low precision, large machining margin, high labor intensity, and low productivity. Therefore, it is mainly used in single-piece and small-batch production with simple structure and shape of forgings.

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