Near-isothermal forging technology is an advanced forging technique that solves the problem of forming some low-plasticity and difficult-to-deform materials. This technology is developed on the basis of the idea of isothermal forging technology. The biggest difference from isothermal forging is that the mold is heated to a temperature lower than the workpiece temperature of about 30-80 ° C and forging.
In this way, on the one hand, the demanding requirements for the mold material are reduced, the selection range of the mold is expanded, and the near-isothermal forging of the titanium alloy is made possible in the atmospheric environment, and at the same time, the application range of the isothermal forging technique is expanded;
There is a certain temperature difference between the forging and the mold, which can provide a certain heat dissipation path for the heat generated by the deformation heat effect in the forging. By reasonably selecting the deformation speed, the temperature loss of the forging can be compensated to a certain extent, so that the deformation of the forging under the approximate isothermal condition is achieved, and the effect of isothermal forging is achieved.
Near-isothermal forging not only reduces the influence of mold chilling and material strain hardening, improves the plasticity of the material, but also reduces the deformation resistance, which is beneficial to simplify the forming process and form forgings with complex shapes with fewer deformation steps. . In terms of materials, near-isothermal forging is mainly applied to metal materials with a narrow forging temperature, especially for titanium alloys and high-temperature alloys with very sensitive deformation temperatures;
in terms of part shape, near-isothermal forging is suitable for thin webs and high Forgings and thin-walled forgings, because the heat of the blanks of such parts will be quickly absorbed by the mold, and the temperature will drop rapidly. The ordinary forging method not only needs to greatly increase the tonnage of the equipment, but also easily cause cracking of the mold. Near-isothermal forging will become one of the most reliable technologies for producing difficult-to-deform metal, narrow forging temperature range and large-scale complex structure forgings in the present and subsequent periods.
According to the characteristics of forgings, the company uses cast high-temperature alloy as the mold material. Under atmospheric conditions, it not only realizes the formation of near-isothermal forging die forgings (the required tonnage of the press is small, and the forging structure is even and small, realizing the small equipment in the true sense. Preparation of large forgings; therefore, near isothermal forging technology is an economically viable process for preparing forgings such as high performance powder alloy forgings and large complex structural parts.
