Forging refers to the use of forging machinery for metal blank, make its produce plastic deformation in order to obtain certain mechanical properties, a certain shape and size of forgings machining method. One of the two part of the forging. By forging can eliminate the as-cast loose metal, welded holes, generally is superior to the same material of the casting on the mechanical properties of the forgings.
Machinery load is high, the important part is tough working conditions, in addition to relatively simple shapes are available rolled plates, profiles or welded parts, the multi-use forgings. Forging press forming methods can be divided into: ① Open forging (free forging). The use of impact force or pressure against the metal in the bottom two iron (anvil) to obtain the desired deformation between forgings, mainly hand-forged and mechanical forging two kinds. ② closed mode forging.
Metal blank has a shaped bore forging die forging to obtain compressive deformation, which can be divided into forging, cold forging, rotary forging, extrusion. Press forging can be divided into hot forging deformation temperature (processing temperature above the recrystallization temperature of the metal blank), warm forging (below the recrystallization temperature) and cold forging (at room temperature). Forging materials of various components are mainly carbon steel and alloy steel, followed by aluminum, magnesium, titanium, copper and its alloys. The original state of a material bar, ingot, the metal powder and liquid metals. Metal cross-sectional area before deformation and the deformed cross-sectional area of the mold is called the forging ratio. The correct choice of forging ratio to improve product quality, reduce costs a great relationship.
Forged steel is the use of a variety of forging material produced and forgings, forgings castings higher quality than can withstand large impact force, effect, ductility, toughness and other aspects of mechanical properties are better than steel castings high, so whatever some important machine parts should be used forgings.