Forging special metal is t to make parts produce plastic deformation after pressure on it by hammer, punch, anvil block of forging machinery so as to obtain the required shape and size.
In stamping processing, each part of the billet mainly forming by changing the size of the space position and the internal don’t appear larger distance of plastic flow. In forging processing, the whole billet plastic deformation occurs obviously and has much of plastic flow. Forging are mainly used for metal parts processing, can also be used for processing some nonmetal, such as engineering plastics, rubber, ceramics, bricks and the forming of composite materials.
The difference between forging with rolling and drawing: Forging and rolling & drawing in metallurgical industry are all belongs to plastic processing, or pressure processing. Forging is mainly used in the production of metal parts, however rolling or drawing are mainly for the production of general metal materials such as sheet, strip, pipe, profile and wire.
Forging are mainly classified according to the forming mode and deformation temperature. It can be divided into two categories, forging and stamping according to forming mode. And it can be divided into hot forging, cold forging, warm forging and isothermal forging, etc according to the deformation temperature.
Hot forging is metal forging above re-crystallization temperature. Raise the temperature can improve the metal plasticity, improve the quality of work-pieces, and not easy to crack. High temperature can also reduce the deformation resistance of the metal and reduce the load of forging machinery required. But hot forging process are more and complex, work-pieces precision is poor, surface is not smooth, forgings are prone to oxidation and decarburization and burning.
Cold forging is metal forging lower than re-crystallization temperature. Normally cold forging more specifically means forging at room temperature and warm forging more specifically means forging will be higher than normal temperature, but no more than re-crystallization temperature. Warm forging parts the precision is high, the surface is bright and clean and deformation resistance is lower. At room temperature of cold forging the shape and size precision is high, smooth surface, less machining process, so facilitated automated production. Many cold forging, cold stamping parts can be directly used for parts or products, no longer need to machining. But because of low metal plasticity it is easy to produce craze, deformation resistance is big, so need higher capacity of forging machinery.
Isothermal forging means the billet temperature is kept in constant value in the forming process. Isothermal forging is to make full use of high plasticity of certain metals in a temperature or in order to obtain specific organization and performance. Isothermal forging will need die and billet together to maintain a constant temperature, so the cost is high and it only for special forging process, such as super-plastic forming.
Forging special metal effect
Forging can change the metal organization, improve the metal properties. As for casting Ingot after hot forging, the original as-cast loose, porosity and micro cracks are compacted or welded. The original dendritic crystals were broken, make the grain fine. At the same time to change the original carbide segregation and uneven distribution, So that we obtain reliable forgings with internal dense, uniform, fine and good comprehensive performance. After hot forging deformation, metal is fibrous tissue. After cold forging deformation metal crystal is in order.
Forging is to make the metal plastic flow and made into the required shape. The metal volume does not change by the external force to produce plastic flow, and the metal is always flow to part of least resistance. In production the work-piece shape controlled based on these rules to realize upsetting, stretching, reaming, bending and deep drawing
Forging special metal production
Forging special metal products are mainly used in electric power, metallurgy, shipbuilding, petrochemical, heavy machinery and other industries; mainly engaged in the production and sale of special metal materials, forging products. Main activities include wind power spindle, pipe mold, other forgings (forging thermal power, nuclear forgings, forging metallurgy, marine forgings) and forging special alloy tube.