Development of laser shock peening equipment

Taiyou Hu; Hongchao Qiao; Jibin Zhao; Ying Lu

doi:10.3969/j.issn.1003-501X.2017.07.010

Article navigation > Opto-Electronic Engineering > 2017 Vol. 44 > No. 7 > 732-737

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Taiyou Hu, Hongchao Qiao, Jibin Zhao, et al. Development of laser shock peening equipment[J]. Opto-Electronic Engineering, 2017, 44(7): 732-737. doi: 10.3969/j.issn.1003-501X.2017.07.010

Citation:

Taiyou Hu, Hongchao Qiao, Jibin Zhao, et al. Development of laser shock peening equipment[J]. Opto-Electronic Engineering, 2017, 44(7): 732-737. doi: 10.3969/j.issn.1003-501X.2017.07.010

Development of laser shock peening equipment

1.
State Key Laboratory of Robotics, Shenyang Institute of Automation Chinese Academy of Sciences, Shenyang 110016, China
2.
School of Computer and Control Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Fund Project:

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Corresponding author: Hongchao Qiao, E-mail: hcqiao@sia.cn

Received Date 04 April 2017

Revised Date 20 June 2017

Published Date 15 July 2017

Abstract

Abstract

In view of the issue that the present domestic industrialization of laser shock peening equipment is not high, a laser shock peening equipment has been developed by using fixed optical system structure and modular design method. The design scheme of laser shock peening equipment, the characteristics of laser optical path ar-rangement and the system control method are analyzed, and the technical specifications of laser shock peening equipment are tested. When the room temperature stables at (22 ± 2) ℃ and 20 minutes after the device is switched on, the technical parameters such as the maximum output single pulse energy up to 25 J, energy instability <3%, pulse width which can be continuously adjusted between 16 ns and 20 ns, pulse width instability < (-1 ns~1 ns), beam divergence <2.5 mrad, beam points instability <50 μrad, the repetition rate of 0.5 Hz 5 Hz are achieved, the transmission efficiency of the optical system is about 92%, the thickness of the constraint layer is uniform and the flow rate is continuously controlled. The test results show that the performance of the laser shock peening equipment is good enough for industrial applications.
- laser shock peening equipment /
- laser /
- control system /
- optical system

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References

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Overview

Overview

Abstract: Laser shock peening is a new type of metal surface modification technology. Compared to the traditional strengthening method, its enhancement effect and applicability are better. The applications of laser shock peening technology are closely related to the equipment development technology. At present, foreign countries have developed a series of laser shock enhancement equipments, but there is a big gap between domestic and foreign countries because of the late start and foreign related technology blockade, mainly for the performance of equipment instability, poor environmental adaptability and low degree of automation control. It is difficult to achieve industrial production applications. In view of the above problems, a fixed optical system structure and modular design method are used to develop a laser shock peening equipment. It can complete the processing of aero engine blade with once clamping, and has a high degree of automation and high precision characteristics. Laser shock peening equipment is mainly composed of the control system, high-energy pulse laser, optical shaping system, trajectory robot, water supply robot, monitoring system and other modules. Under the coordination of the control system, the laser outputs short pulse high energy, and laser beam forms a different mode of laser through the optical path shaping system. Meanwhile, the track robot and waterjet robot in accordance with the pre-programmed program movement, and equipment equipped with monitoring system can monitor the operation of each sub-module system and read the running data and fault alarm in real time, and the formation of closed-loop control system feedback control each sub-module system. When the room temperature stable at (22 ± 2) ℃ and 20 minutes after the device is switched on, the technical parameters such as the maximum output single pulse energy up to 25 J, energy instability < 3%, pulse width which can be continuously adjusted between 16 ns and 20 ns, pulse width instability within -1 ns~1 ns, beam divergence < 2.5 mrad, beam points instability <50 μrad, the repetition frequency of 0.5 Hz~5 Hz are achieved, the transmission efficiency of the optical system is about 92%, the thickness of the constraint layer is uniform and the flow rate is continuously controlled. The test results show that the performance of the laser shock peening equipment is good.