Wear Analysis of Hot Extrusion Punch for Large Fan Shaft Based on Archard Wear Theory

In this work, a hot extrusion process was proposed to manufacture the 18Ni (250) maraging steel large fan shaft for aero engines. To reduce the wear of the hot extrusion punch and extend its service life, a wear model of the hot extrusion punch for the large fan shaft was established based on the Archard theoretical model, and the wear distribution of the punch and the effects of the geometric structure parameters of the punch, such as draft angle and draft height, on the wear of the punch were studied. The results show that the wear of the punch after extrusion forming was mainly concentrated in the bottom transition fillet and working bevel areas. With the increase of the punch draft angle, the maximum wear depth at the punch fillet increased linearly and significantly. With the increase of the draft height, the wear depth of the punch increased gradually. After 35 times of continuous extrusion production, the accumulative wear depth of the round corner area at the bottom of the punch was about 10 mm, with an error of 18.5% from the prediction result, which proved the correctness of the FE simulation and the accuracy of the prediction model of the accumulated wear depth of the extrusion punch.