Forging has a long history in China, and it has been continued by the production method of manual workshops. Probably around the beginning of the 20th century. It gradually appeared in the railway, military industry, shipbuilding and other industries with the production method of mechanical industrialization.
Forging is a processing method that uses forging machinery to apply pressure to metal blanks to cause plastic deformation to obtain forgings with certain mechanical properties, certain shapes and sizes. It is one of the two major components of forging (forging and stamping). Forging can eliminate defects such as as-cast porosity produced in the metal smelting process and optimize the microstructure.
The existence of forging defects will affect the processing quality or processing quality of the subsequent process, and some will seriously affect the performance and use of the forgings, and even greatly reduce the service life of the finished products and endanger the safety.
There will inevitably be some defects in the production of forgings, some of which are unpredictable and some can be avoided, so it is necessary to avoid defects as much as possible in the forging process.
If the forging ratio is reasonable, the steel ingot is forged at high temperature, and the coarse primary dendrites are broken
sonably determining the size of the forging ratio is one of the important factors to ensure the ideal forging effect and obtain high-quality forgings
When the ingot forging reaches a certain forging ratio, the dendritic grains of the as-cast structure is broken and deformed, and elongated along the main deformation direction.
High specific strength, high specific stiffness, high specific elastic modulus, high fatigue strength, suitable for lightweight key components, and its comprehensive performance is much higher than other materials.
The mechanical properties of a metal depend on its organizational state. After the forging deformation of the ingot with a suitable forging ratio, a dense forging structure can be obtained,
The microstructure and mechanical properties of forgings are related to many factors, and the forging ratio is one of the most important factors affecting the quality of forgings.
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