Aero-engine bearing inner ring ultrasonic impact surface nano strengthening device and method

Abstract

The invention relates to an aero-engine bearing inner ring ultrasonic impact surface nano strengthening device. According to the device, a driving device of the device comprises a motor and a rotating shaft, a bearing inner ring to be machined is installed on the rotating shaft, the motor drives the rotating shaft to drive the bearing inner ring to rotate synchronously, an ultrasonic shot blasting device comprises an ultrasonic shot blasting cavity, an ultrasonic probe and a steel ball, the ultrasonic probe extends into the ultrasonic shot blasting cavity from a lower end opening, the steel ball covers the upper surface of the ultrasonic probe, and an upper end opening of the ultrasonic shot blasting cavity is formed in the lower end of the bearing inner ring to be machined to achieve clearance fit. According to the device, a tool capable of being adjusted in an up-down mode and installed in a split mode is adopted, the problem that ultrasonic shot blasting is not suitable for bearing manufacturing due to limitation of generation, a vibration device and a shot blasting direction is solved, precise clearance fit is achieved by means of a cambered surface cavity and a bearing inner ring raceway, variable-speed rotation is achieved by means of an adjustable-speed motor, a shot blasting distance can be adjusted in an up-down mode, technological parameters can be adjusted, and ultrasonic impact is successfully applied to an aero-engine bearing inner ring, so that a surface nano layer with a certain thickness is generated on a surface of the raceway.

Description

technical field [0001] The invention relates to the technical field of nano-strengthening tooling on the surface of workpieces, in particular to a nano-strengthening device and method for ultrasonically impacting the inner ring of an aircraft bearing inner ring. Background technique [0002] Hangfa bearings are the core components of aero-engines. Due to their extreme working conditions and complex manufacturing processes, their extremely high service performance and life guarantee are frontier challenges in the manufacturing field. Studies have shown that the main failure modes of aero-engine bearings are surface damage and fracture, and the existing forming and heat treatment processes are difficult to achieve revolutionary improvements in the performance of the raceway surface and substrate of aero-engine bearings. The performance and life of Hangfa bearings have reached the limit and it is difficult to break through, which has become an international problem restricting ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a nano-strengthening device and method for ultrasonically impacting the surface of the inner ring of the Hangfa Bearing in view of the shortcomings of the currently processed Hangfa Bearing bearing rings with low hardness, poor wear resistance, and short fatigue life. Through the method of high-frequency ultrasonic shot peening impact strengthening, the raceway of the inner ring of the bearing is impacted by high-speed pellets to produce a surface nano-layer with a certain thickness, thereby improving the hardness, wear resistance and fatigue life of the working surface of the inner ring of the bearing. Break through the service performance and life limit of existing aviation bearings

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