In the production process of wind power spindle forging, hot compression processing technology is often used to improve its mechanical properties and durability. Hot compression processing refers to the plastic deformation of metal materials under high temperature and stress conditions, so as to improve the grain structure, microstructure and mechanical properties of the material. The following will introduce the hot compression processing method and deformation mechanism of the wind power spindle forging in detail.
First, hot compression processing method:
- Hot spinning method: Hot spinning is to preheat the forging in the heating equipment, and then make it rotate through the application of axial force and radial force. This method can change the internal organization and shape of the forging by adjusting the rotation speed and strain rate, thereby increasing its strength and hardness.
- Hot extrusion method: Hot extrusion is to heat the forging to a high temperature state, by applying large pressure to make it extrusion deformation in the mold. This method can refine and homogenize the grain structure of forgings, thus improving its plasticity and fatigue resistance.
- Hot drawing method: Hot drawing is to apply tensile force to the forging at high temperature to make it stretch and deform. The grain boundary structure and mechanical properties of forgings can be optimized by the deformation and recrystallization of grains, and the strength and toughness can be improved.
Second, deformation mechanism:
- Grain refinement: In the process of hot compression processing, under the action of high temperature and strain rate, the grains of forging materials will gradually become smaller. This is because grain boundary migration and dislocation slip are promoted at high temperatures, forming more low-angle grain boundaries and sub-grain boundaries, thereby limiting grain growth and increasing the strength and hardness of the material.
- Organization adjustment: Hot compression processing can change the organization structure of forgings by means of grain boundary migration and precipitated phase formation. Grain boundary migration can reduce the length and number of grain boundaries, thus reducing the sensitivity of grain boundaries to stress and improving the fatigue resistance of forgings. The formation of precipitated phase can refine grain and improve plasticity and toughness of the material.
- Phase change effect: Some metal materials may undergo phase change during the thermal compression process, such as the austenite phase into martensite. The phase change process is accompanied by the release of the internal stress of the material and the change of the lattice structure, thus improving the strength and hardness of the forgings.
To sum up, the hot compression processing of wind power spindle forgings changes the internal structure and shape of the forgings by controlling parameters such as deformation mode, temperature, pressure and deformation rate, thus significantly improving its mechanical properties and durability. The selection and optimization of these processing methods and deformation mechanisms is the key to achieve high-quality wind power spindle forging manufacturing. Through the accumulation of research and practice, continuous improvement of hot compression processing technology can further improve the performance of wind power spindle forgings and promote the development of wind power industry.
