An Intelligent Fixture for Improving the Precision of Laser Shocking of Blisks

Abstract

The invention relates to the field of tool clamps for laser-shock blisks, in particular to an intelligent clamp for improving the laser shock precision of a blisk. According to the intelligent clamp for improving the laser shock precision of the blisk, a patch piezoelectric sensor and a polygonal carbon fiber board are integrated on an integrated piezoelectric induction unit to monitor and analyzethe vibrating frequency of the blisk shocked by lasers in real time, a feedback signal is input to a vibration controller to generate flyback drive signal to drive an electromagnetic actuator to trigger reverse rotational vibrations of the blisk, so that flexural vibrations of blades are generated to compensate for blade vibrations caused by laser shocks, vibrating deformation of the blades in the whole shocking process is reduced, and accordingly, the laser shock peening effect and precision are improved.

Description

technical field [0001] The invention relates to the field of tooling fixtures for laser shocking integral blisks, in particular to an intelligent fixture for improving the laser shock accuracy of integral blisks. [0002] technical background [0003] Laser shock peening LSP technology is used to strengthen key components such as aero-engine compressor blades, turbine blades, and blisks to improve their resistance to fatigue fracture, foreign object damage, and fretting wear. [0004] At the same time, all kinds of blisk parts, including turbine blisks and aeroengine blisks, are thin-walled and weakly rigid parts, which are prone to elastic deformation and vibration problems in the actual laser shock peening process. Such problems are rarely considered when machining blade parts, resulting in a decrease in impact strengthening machining accuracy. Due to the elastic deformation and vibration of the parts, the parameters of the laser cannot be accurately controlled, which will...

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Problems solved by technology

[0004] At the same time, all kinds of blisk parts, including turbine blisks and aeroengine blisks, are thin-walled and weakly rigid parts, which are prone to elastic deformation and vibration problems in the actual laser shock peening process. When processing blade parts, such problems are rarely considered, resulting in reduced precision of impact strengthening processing

Due to the elastic deformation and vibration of the parts, the parameters of the laser cannot be accurately controlled, which will reduce the strengthening accuracy and strengthening effect of the blade parts

[0005] The patent authorization announcement number is CN 103894736 B, which discloses a blisk laser shock strengthening fixture, which can effectively undertake the positioning and clamping role in the impact strengthening process of blisk workpieces, but does not take into account the processing quality in the laser shock process. ; The patent authorization announcement number is CN 105316473 B, which discloses a laser shock processing online detection and correction system based on the vibration frequency of the workpiece. The vibration signal of the target material is collected by the vibration sensor contact, and the processed signal is compared with the normal shock in the database. Time-to-time vibration frequency comparison is used to detect the impact quality, and the laser power is adjusted to improve the impact speed and efficiency

However, this method only uses the vibration frequency as a signal for judging the quality of the impact, without taking into account the impact of workpiece vibration on the laser impact quality, and for blisk workpieces, the space between adjacent blades is narrow, and it is difficult to accommodate vibration sensors. At the same time, the setting of the contact position of the vibration sensor has a great influence on the measurement accuracy of the vibration signal

Difficult to obtain reliable vibration signals for blisk workpieces

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