Forging, machining and casting are all the oldest metal processing technologies. In the production process, a series of operations, such as hammering, pressing, rolling, extrusion and so on, are needed. In order to complete these forgings, it is necessary to complete operations in different equipment.
There are many classifications of forgings. In general, it can be divided according to temperature and technology. Hot forging is an operation in which forging temperature exceeds 1150 degrees in production. In this process, the temperature will exceed the re-crystallization point of the metal. This extreme temperature and heat is necessary to avoid metal strain hardening during deformation. Isothermal forging can be used to prevent oxidation of metals, such as super-alloys. During isothermal forging, metal will deform, similar to that in a highly controlled environment. According to different materials and parts types, the temperature ranges from 650 to 1000 degrees. This is usually higher than the work hardening temperature of the work piece and lower than the scale temperature. When the temperature is lower than the recrystallization point, the metal will deform. When aluminum and other metals are softened, cold forging is usually done. Compared with hot forging, cold forging
process is cheaper, and later processing work is also less. This will involve the concept of tempering, which means that aluminium will become the desired shape after cold forging operation. At this time, the strength of aluminium will need to be increased by heat treatment.
In China, cold forging
is a metal forming process, which involves billets of various shapes, mainly made of billets, discs or bar profiles. The parts made by this process have high strength characteristics, and the surface is made of special materials. These components will become automobile parts in the future because of their high quality lightweight structures and new materials.
For cold forging
process, steel is very important. When annealing, the yield strength of the steel will decrease and the elongation will increase. During the whole process, the hardness, fracture strength and yield strength will increase significantly, while the elongation at break and fracture rate will decrease relatively. The fatigue strength and durability of cold extruded work pieces are significantly higher than those of mechanical processing, sintering and even welding parts.
Choose quality cold forging china
from HEWCHO Manufacturer here!