Copious cooling work table, copious cooling laser shock peening experiment system and control method thereof

Abstract

The invention provides a copious cooling work table, a copious cooling laser shock peening experiment system and a control method thereof. The conical gap is adjusted according to the electromagnetic principle so that the gasification volume of liquid nitrogen can be accurately controlled, then the copious cooling work table and the surface temperature of a sample can be accurately controlled by adjusting the heat absorption capacity of gasification of the liquid nitrogen, the temperature adjusting range and the temperature rising / lowering speed of the copious cooling laser shock peening experiment system are effectively expanded, and the control accuracy of the surface temperature of the sample is improved through closed-loop control. In addition, intelligent control over the copious cooling laser shock peening technology process is realized through a computer and a PLC control unit, the usage amount of the liquid nitrogen in the experiment process is reduced, and the machining efficiency is improved.

Description

technical field [0001] The invention relates to the field of laser processing technology and the field of surface strengthening. It proposes a cryogenic workbench, a cryogenic laser shock strengthening experiment system and its control method, and uses electromagnetic suction to adjust the gap between the cone surfaces so as to accurately control the gasification volume of liquid nitrogen and the surface temperature of the sample. Cryogenic laser shock strengthening experiment system. Background technique [0002] Cryogenic laser shock strengthening technology combines the multiple advantages of laser shock strengthening high-energy ultrafast and ultra-low temperature deformation technology, which can induce higher dislocation density, thereby significantly improving the hardness of the surface of metal materials. Transportation and other fields have extremely broad application prospects. However, cryogenic laser shock peening technology has extremely high requirements on t...

AI Technical Summary

Problems solved by technology

However, cryogenic laser shock peening technology has extremely high requirements on temperature, and there are obvious differences in the optimal cryogenic temperature of different materials, which requires cryogenic laser shock peening equipment to have a larger temperature adjustment range and a higher temperature control precision

[0003] At present, liquid nitrogen is generally used as the cooling medium in cryogenic laser shock strengthening equipment to achieve refrigeration. For example, the patent publication No. CN102492805B proposes a method and device for strengthening metal materials using cryogenic laser shock, which uses liquid nitrogen as the cooling medium , using the principle of heat conduction to cool the entire cryogenic treatment chamber and then control the surface temperature of the sample. Although this method can achieve cryogenic laser shock strengthening to a certain extent, it still has the following shortcomings: 1. Affected by the volume of the cryogenic treatment chamber, cooling 2. The temperature distribution in the cryogenic treatment chamber is uneven and the response speed of temperature adjustment is low, so the control accuracy of the surface temperature of the sample is not high, and the error is large; 3. The amount of liquid nitrogen used is large, higher cost

The patent application with the patent number CN105063284A proposes a cryogenic laser shock head and laser shock system with high light transmittance suitable for cryogenic laser shock technology. Ultra-low temperature is achieved by soaking the sample in liquid nitrogen, but there are still The following disadvantages: 1. The method and device can only achieve a single temperature, and cannot achieve temperature regulation; 2. The temperature control accuracy of the invention is closely related to the size of the sample, the volume of the cryogenic box, and the room temperature, and the temperature control accuracy is not high; 3. .Large amount of liquid nitrogen is used and the cost is high

Through the search of domestic and foreign literature, no relevant device has been found to adjust the gap between the cone surfaces through electromagnetic suction to control the temperature of the cryogenic workbench, and no relevant reports have been found on the application of related methods in the field of cryogenic laser shock. This invention is the first propose the device

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