Regional ultrasonic impact strengthening method for thin-wall blade

Abstract

The invention discloses a regional ultrasonic peening method for a thin-wall blade, which comprises the following steps of: dividing the thin-wall blade into a blade root region, an intake and exhaust edge region and a molded surface region according to a theoretical model and an actually measured three-dimensional model of the thin-wall blade; performing ultrasonic impact strengthening on the molded surface area by adopting a symmetrical ultrasonic impact tool; a single-head ultrasonic impact tool is adopted for conducting ultrasonic impact strengthening on the blade root area; a single-head ultrasonic peening tool is adopted for conducting ultrasonic peening on the air inlet and outlet edge area, and ultrasonic peening of the thin-wall blade is completed; wherein the ultrasonic impact strengthening machining mode is one-way feeding; according to the structural characteristics of the aero-engine blade, the aero-engine blade is divided into three areas, proper ultrasonic peening machining schemes are adopted for the different areas, the purpose of conducting ultrasonic peening strengthening on the thin-wall blade is achieved under the condition that machining deformation is avoided by adjusting the feeding direction and the line spacing, and the surface roughness of the blade is improved.

Description

technical field [0001] The invention belongs to the technical field of surface strengthening of thin-walled blades in metal machining, and in particular relates to a regional ultrasonic impact strengthening method for thin-walled blades. Background technique [0002] Blades are one of the most important core rotating components in aero-engines. They are safety-sensitive products and need to work stably in harsh environments such as high temperature, high pressure, and high-speed rotation. Once it fails, it will lead to downtime, endanger safety, and even cause machine crash and death. [0003] In order to improve its fatigue performance and reliability, surface strengthening treatment is generally carried out after cutting and forming to improve its surface mechanical properties. The commonly used surface strengthening process is shot peening. However, the surface roughness of the blade after shot peening is relatively large, and the processing controllability is poor. Co...

AI Technical Summary

Problems solved by technology

The commonly used surface strengthening process is shot peening. However, the surface roughness of the blade after shot peening is relatively large, and the processing controllability is poor.

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