The blisk root-fillet exhibits a significant stress concentration in high-load operations, which has a significant influence on fatigue life and aerodynamic performance. To improve the static and dynamic fatigue life of the blisk in the thermal interaction environment, a method based on the anti-fatigue manufacturing principle is introduced to obtain longitudinal micromarks along the root-fillet. First, this paper proposes a belt grinding method that can obtain longitudinal micromarks, and the interference avoidance technique is analysed according to the allowance distribution and structural characteristics of the blisk root-fillet. Second, optimisation of the grinding path step is realised by means of the ‘point to point’ method, and de-noising and smoothing of the grinding vector are carried out. Finally, grinding experiment tests are carried out for the blisk root-fillet. The results demonstrate that the surface roughness is less than 0.4 μm following grinding, and the transition between the plane and fillet (blade profile—root-fillet—tenon plane) is smooth. Moreover, fine and uniform longitudinal micromarks are formed and the precision consistency is significantly improved, which proves the effectiveness of this method.
The International Journal of Advanced Manufacturing Technology – Springer Journals
Published: Nov 3, 2017
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