Method for forging large forging

Abstract

The invention relates to a method for forging a large forging, which comprises the following steps: heating a casting blank or continuous casting blank to a forging temperature, and keeping the temperature; 2, cooking to reduce the surface temperature of the casting blank to 700 to 800 DEG C while keeping the high temperature in a central part, and performing central compression forging with a total deformation degree of 6 to 20 percent on a blank material when the difference between the internal temperature and the external temperature reaches 400 to 450 DEG C to obtain a steel blank; and 3) cooling the whole steel blank to 700 to 800 DEG C, rising the temperature at a speed of 50 to 100 DEG C / h to a forging temperature, keeping the temperature, namely keeping the surface regional temperature of the steel blank to a forging temperature and the central temperature still between 700 and 800 DEG C, and performing forging with a total deformation amount of 6 to 20 percent of the steel blank. The large-forging forging method can effectively eliminate the drawbacks of large forgings and improve the mechanical properties and surface and central deformation uniformity and structural and mechanical property uniformity of the large forgings.

Description

technical field [0001] The invention belongs to the technical field of material processing engineering, and in particular relates to a large forging forming method. Background technique [0002] Large-scale complete sets of equipment for steel, electric power, petrochemical, nuclear power, high-energy physics, and wind power generation have huge workloads and harsh environments. In order to ensure the reliability and safety of equipment, Take wind power forgings as an example. Wind power forgings are often important parts in wind power generation systems. Most of the wind farms in my country are located in the freezing north, where the wind speed changes rapidly. Working in such harsh conditions, forgings not only have to bear large alternating loads , but also to withstand huge impact loads, therefore, its mechanical properties are often required very high, due to the distribution of alternating loads in the part section, the surface properties of the part are particularly i...

AI Technical Summary

Problems solved by technology

Production practice shows that cooling forging does greatly improve the quality of forgings, but when the above method is used for forging, since the energy is concentrated to the easily deformed core, the defects of the core can be well eliminated, but the temperature of the surface area during forging is far away. The temperature is much lower than the core, the surface area is not easy to deform, and the defects are not easy to eliminate

In addition, in the ordinary free forging process, the surface area in contact with the anvil is a hard-to-deform area, and it is difficult to obtain a large amount of deformation, and its performance is difficult to improve through deformation, and the actual working conditions often have a high impact on the surface properties. Require

Therefore, it is difficult to obtain large forgings with high mechanical properties, surface and core deformation, uniform structure and mechanical properties by a single cooling forging process