Numerical simulation and experiment study on hot extrusion process of 18Ni (250) maraging steel large fan shaft for aero-engines.

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    • Abstract:
      The adoption of the free forging process to produce oversized aviation shaft components with a diameter of 510 mm and a weight of 1130 kg has numerous technical problems, such as unstable manufacturing process, uneven forging deformation and poor comprehensive performance. In this work, the hot extrusion process was proposed to manufacture the 18Ni (250) maraging steel large fan shaft for aero-engines. The effects of main process parameters such as friction coefficient, billet temperature and punch speed on the extrusion force, deformation distribution, temperature distribution, and tool stress were studied employing finite element simulation technology. Finally, the experiment was conducted with the optimal process conditions, and the surface quality, microstructure, and mechanical performance of the trial-produced part were characterized. The numerical simulation results show that the large fan shaft extrusion part had sufficient deformation, more uniform temperature distribution, and relatively small extrusion force with the friction coefficient of 0.25, the billet temperature of 1080 °C, and the extrusion velocity of 30 mm/s. The microstructure and mechanical properties test results show that the large fan shaft component with full filling, uniform microstructure, and excellent performance could be produced by using the developed hot extrusion process, which provided a feasible reference for the manufacturing of similar large aviation shaft components. [ABSTRACT FROM AUTHOR]
    • Abstract:
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