CN-116377203-B - Temperature control laser shock strengthening device with water as constraint layer and processing method

Abstract

The application discloses a temperature control laser shock peening device taking water as a constraint layer and a processing method. The device comprises a sealing bin body, a water circulation device, a heating platform and a moving platform, wherein the sealing bin body is provided with a pressurizing device and used for providing a closed high-pressure environment for a workpiece to be processed by laser impact, the heating platform is used for heating the processed workpiece and circulating water to form a water constraint layer capable of covering the workpiece, and the moving platform is configured with the heating platform and the sealing bin body so as to drive the heating platform to move. The device is used for carrying out laser impact, so that the surface of the workpiece and the tensile residual stress on the surface of the workpiece can be eliminated, and the surface strength and fatigue performance of the workpiece are improved. And the strength and fatigue performance of the metal are improved to a greater extent. Because the boiling point of water can reach 374 ℃ at most, the water is prevented from evaporating by introducing ultrahigh pressure into the sealing bin body, so that the water is successfully used as a high-temperature laser shock-strengthening constraint layer, workpieces with different shapes can be processed, and the cleaning after the processing is convenient.

Inventors

• CHENG JIARUI
• SHU TAN
• LIU FENG

Assignees

• 武汉大学

Dates

Publication Date

20260512

Application Date

20230320

Claims (10)

1. 1. A temperature controlled laser shock peening device with water as a constraining layer, comprising: The sealing bin body is provided with a pressurizing device and is used for providing a closed high-pressure environment for a workpiece to be processed by laser impact; a water circulation device for providing circulating water; A heating stage for heating at least a work piece and circulating water to form a water confinement layer capable of covering the work piece; and the movable platform is provided with a heating platform and a sealing bin body so as to at least drive the movement of the heating platform.
2. 2. The temperature-controlled laser shock peening device with water as a constraining layer according to claim 1, wherein the material or structure of the sealed cabin body is configured to withstand 0.1MPa-600MPa.
3. 3. The temperature-controlled laser shock peening device with water as a constraining layer according to claim 1, wherein a cooling assembly is provided in the water circulation device for cooling the workpiece.
4. 4. The temperature-controlled laser shock peening device using water as a constraining layer according to claim 1, wherein the moving stage is an XYZ moving stage, an X-direction stroke is 1000mm or less, a Y-direction stroke is 1000mm or less, and a Z-direction stroke is 1000mm or less.
5. 5. The temperature-controlled laser shock peening apparatus with water as a constraining layer according to claim 1, wherein the heating stage is connected with a stage controller for controlling a temperature of the heating stage and testing a water temperature of the circulating water, the temperature of the heating stage being controlled to be 600 ℃ or less.
6. 6. The temperature-controlled laser shock peening device with water as a constraining layer according to claim 1, wherein said moving platform is connected with a moving platform controller for controlling the movement of the moving platform.
7. 7. The temperature-controlled laser shock peening device with water as a constraining layer according to claim 1, wherein the workpiece is covered with an ablative layer made of carbon black, graphite, black paint or aluminum foil.
8. 8. The temperature-controlled laser shock peening device using water as a constraint layer according to claim 1, wherein a light passing mirror for passing laser is arranged on the outer wall of the sealed cabin body.
9. 9. A method for processing laser shock peening, characterized in that the temperature-controlled laser shock peening device using water as a constraint layer according to claim 1 is used to perform laser shock peening on a workpiece.
10. 10. The method of claim 9 wherein the laser shock parameters are 532-1064nm laser wavelength, 10fs-100ns pulse width, 1-20HZ laser frequency, 0.1-10J single pulse laser energy, and 0.01-10mm spot diameter.

Description

Temperature control laser shock strengthening device with water as constraint layer and processing method Technical Field The application relates to the technical field of laser shock peening, in particular to a temperature control laser shock peening device taking water as a constraint layer and a processing method. Background The laser shock strengthening technology is a new technology for strengthening the metal surface by utilizing plasma shock waves generated by strong laser beams, and has the outstanding advantages of non-contact, no heat affected zone, strong controllability, obvious strengthening effect and the like. Tightly covering a layer of aluminum foil or carbon black on the surface of the polished and cleaned workpiece as an ablation layer, covering a constraint layer on the ablation layer, and loading laser pulse on the workpiece through the constraint layer. The ablative layer absorbs laser energy instantaneously, converts it into plasma and expands rapidly, creating tremendous pressure. The shock wave generated by the expansion of the plasma propagates onto the workpiece, causing plastic deformation of the material. The process can eliminate the tensile residual stress on the surface of the workpiece and the surface of the workpiece, thereby improving the surface strength and fatigue performance of the workpiece. The unexpected result is often obtained by preheating the workpiece and then performing laser shock peening, for example, a pinning effect is generated by precipitating a reinforcing phase in the metal, and the metal can be softened at a high temperature to be more easily subjected to plastic deformation, so that the strength, fatigue performance and the like of the metal are improved to a greater extent. However, in actual work, high-strength glass is often used as a constraint layer, the strength of the high-strength glass at high temperature and the transmissivity of laser are reduced due to the influence of high temperature, the situation that the glass of the constraint layer breaks often occurs in the impact process, the experimental result is adversely affected, and the workpiece after the experiment is difficult to clean. And for some workpieces with non-planar surfaces, laser shock strengthening is difficult to realize by taking high-strength glass as a constraint layer. The above problems can be avoided if water is used as the constraining layer, but the high-temperature water at normal temperature and normal pressure can evaporate and is not suitable for being used as the constraining layer for high-temperature laser shock peening. Therefore, high-temperature laser shock peening is often difficult to implement and costly. Disclosure of Invention In view of the above, the present application provides a temperature-controlled laser shock peening apparatus and a machining method using water as a constraining layer, which can use water as a constraining layer for high-temperature laser shock peening, thereby not only machining workpieces of different shapes, but also facilitating cleaning after machining. In a first aspect, the present application provides a temperature-controlled laser shock peening apparatus using water as a constraining layer, including: The sealing bin body is provided with a pressurizing device and is used for providing a closed high-pressure environment for a workpiece to be processed by laser impact; a water circulation device for providing circulating water; A heating stage for heating at least a work piece and circulating water to form a water confinement layer capable of covering the work piece; and the movable platform is provided with a heating platform and a sealing bin body so as to at least drive the movement of the heating platform. Optionally, the material or structure of the sealed cabin body is configured to bear 0.1Mpa-600Mpa. Optionally, a cooling component is arranged in the water circulation device and is used for cooling the workpiece. Optionally, the moving platform is an XYZ moving platform, the X-direction travel is 1000mm or less, the Y-direction travel is 1000mm or less, and the Z-direction travel is 1000mm or less. Optionally, a platform controller is connected to the heating platform for controlling the temperature of the heating platform and testing the water temperature of the circulating water, and the temperature of the heating platform is controlled to be below 600 ℃. Optionally, the mobile platform is connected with a mobile platform controller for controlling the movement of the mobile platform. Optionally, the workpiece is covered with an ablation layer, and the ablation layer is made of carbon black, graphite, black paint or aluminum foil. Optionally, a light-passing mirror for allowing laser to pass through is arranged on the outer wall of the sealed bin body. In a second aspect, the present application provides a method for processing laser shock peening, where the temperature-controlled laser shock peening apparatu